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disas: Remove libvixl disassembler 

The disassembly via capstone should be superiour to our old vixl
sources nowadays, so let's finally cut this old disassembler out
of the QEMU source tree.

Message-Id: <20220603164249.112459-1-thuth@redhat.com>
Tested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
master
Thomas Huth 2022-06-03 18:42:49 +02:00
parent 886dfe9db3
commit 2116650254
30 changed files with 3 additions and 15015 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
MAINTAINERS
View File

@ -165,8 +165,6 @@ F: tests/qtest/arm-cpu-features.c
F: hw/arm/
F: hw/cpu/a*mpcore.c
F: include/hw/cpu/a*mpcore.h
F: disas/arm-a64.cc
F: disas/libvixl/
F: docs/system/target-arm.rst
F: docs/system/arm/cpu-features.rst
@ -3313,8 +3311,6 @@ M: Richard Henderson <richard.henderson@linaro.org>
S: Maintained
L: qemu-arm@nongnu.org
F: tcg/aarch64/
F: disas/arm-a64.cc
F: disas/libvixl/
ARM TCG target
M: Richard Henderson <richard.henderson@linaro.org>

3
disas.c
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@ -178,9 +178,6 @@ static void initialize_debug_host(CPUDebug *s)
#endif
#elif defined(__aarch64__)
s->info.cap_arch = CS_ARCH_ARM64;
# ifdef CONFIG_ARM_A64_DIS
s->info.print_insn = print_insn_arm_a64;
# endif
#elif defined(__alpha__)
s->info.print_insn = print_insn_alpha;
#elif defined(__sparc__)

101
disas/arm-a64.cc
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@ -1,101 +0,0 @@
/*
* ARM A64 disassembly output wrapper to libvixl
* Copyright (c) 2013 Linaro Limited
* Written by Claudio Fontana
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "qemu/osdep.h"
#include "disas/dis-asm.h"
#include "vixl/a64/disasm-a64.h"
using namespace vixl;
static Decoder *vixl_decoder = NULL;
static Disassembler *vixl_disasm = NULL;
/* We don't use libvixl's PrintDisassembler because its output
* is a little unhelpful (trailing newlines, for example).
* Instead we use our own very similar variant so we have
* control over the format.
*/
class QEMUDisassembler : public Disassembler {
public:
QEMUDisassembler() : printf_(NULL), stream_(NULL) { }
~QEMUDisassembler() { }
void SetStream(FILE *stream) {
stream_ = stream;
}
void SetPrintf(fprintf_function printf_fn) {
printf_ = printf_fn;
}
protected:
virtual void ProcessOutput(const Instruction *instr) {
printf_(stream_, "%08" PRIx32 " %s",
instr->InstructionBits(), GetOutput());
}
private:
fprintf_function printf_;
FILE *stream_;
};
static int vixl_is_initialized(void)
{
return vixl_decoder != NULL;
}
static void vixl_init() {
vixl_decoder = new Decoder();
vixl_disasm = new QEMUDisassembler();
vixl_decoder->AppendVisitor(vixl_disasm);
}
#define INSN_SIZE 4
/* Disassemble ARM A64 instruction. This is our only entry
* point from QEMU's C code.
*/
int print_insn_arm_a64(uint64_t addr, disassemble_info *info)
{
uint8_t bytes[INSN_SIZE];
uint32_t instrval;
const Instruction *instr;
int status;
status = info->read_memory_func(addr, bytes, INSN_SIZE, info);
if (status != 0) {
info->memory_error_func(status, addr, info);
return -1;
}
if (!vixl_is_initialized()) {
vixl_init();
}
((QEMUDisassembler *)vixl_disasm)->SetPrintf(info->fprintf_func);
((QEMUDisassembler *)vixl_disasm)->SetStream(info->stream);
instrval = bytes[0] | bytes[1] << 8 | bytes[2] << 16 | bytes[3] << 24;
instr = reinterpret_cast<const Instruction *>(&instrval);
vixl_disasm->MapCodeAddress(addr, instr);
vixl_decoder->Decode(instr);
return INSN_SIZE;
}

30
disas/libvixl/LICENCE
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@ -1,30 +0,0 @@
LICENCE
=======
The software in this repository is covered by the following licence.
// Copyright 2013, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

11
disas/libvixl/README
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@ -1,11 +0,0 @@
The code in this directory is a subset of libvixl:
https://github.com/armvixl/vixl
(specifically, it is the set of files needed for disassembly only,
taken from libvixl 1.12).
Bugfixes should preferably be sent upstream initially.
The disassembler does not currently support the entire A64 instruction
set. Notably:
* Limited support for system instructions.
* A few miscellaneous integer and floating point instructions are missing.

7
disas/libvixl/meson.build
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@ -1,7 +0,0 @@
libvixl_ss.add(files(
'vixl/a64/decoder-a64.cc',
'vixl/a64/disasm-a64.cc',
'vixl/a64/instructions-a64.cc',
'vixl/compiler-intrinsics.cc',
'vixl/utils.cc',
))

4624
disas/libvixl/vixl/a64/assembler-a64.h
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2116
disas/libvixl/vixl/a64/constants-a64.h
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83
disas/libvixl/vixl/a64/cpu-a64.h
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@ -1,83 +0,0 @@
// Copyright 2014, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_CPU_A64_H
#define VIXL_CPU_A64_H
#include "vixl/globals.h"
#include "vixl/a64/instructions-a64.h"
namespace vixl {
class CPU {
public:
// Initialise CPU support.
static void SetUp();
// Ensures the data at a given address and with a given size is the same for
// the I and D caches. I and D caches are not automatically coherent on ARM
// so this operation is required before any dynamically generated code can
// safely run.
static void EnsureIAndDCacheCoherency(void *address, size_t length);
// Handle tagged pointers.
template <typename T>
static T SetPointerTag(T pointer, uint64_t tag) {
VIXL_ASSERT(is_uintn(kAddressTagWidth, tag));
// Use C-style casts to get static_cast behaviour for integral types (T),
// and reinterpret_cast behaviour for other types.
uint64_t raw = (uint64_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(raw));
raw = (raw & ~kAddressTagMask) | (tag << kAddressTagOffset);
return (T)raw;
}
template <typename T>
static uint64_t GetPointerTag(T pointer) {
// Use C-style casts to get static_cast behaviour for integral types (T),
// and reinterpret_cast behaviour for other types.
uint64_t raw = (uint64_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) == sizeof(raw));
return (raw & kAddressTagMask) >> kAddressTagOffset;
}
private:
// Return the content of the cache type register.
static uint32_t GetCacheType();
// I and D cache line size in bytes.
static unsigned icache_line_size_;
static unsigned dcache_line_size_;
};
} // namespace vixl
#endif // VIXL_CPU_A64_H

877
disas/libvixl/vixl/a64/decoder-a64.cc
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@ -1,877 +0,0 @@
// Copyright 2014, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "vixl/globals.h"
#include "vixl/utils.h"
#include "vixl/a64/decoder-a64.h"
namespace vixl {
void Decoder::DecodeInstruction(const Instruction *instr) {
if (instr->Bits(28, 27) == 0) {
VisitUnallocated(instr);
} else {
switch (instr->Bits(27, 24)) {
// 0: PC relative addressing.
case 0x0: DecodePCRelAddressing(instr); break;
// 1: Add/sub immediate.
case 0x1: DecodeAddSubImmediate(instr); break;
// A: Logical shifted register.
// Add/sub with carry.
// Conditional compare register.
// Conditional compare immediate.
// Conditional select.
// Data processing 1 source.
// Data processing 2 source.
// B: Add/sub shifted register.
// Add/sub extended register.
// Data processing 3 source.
case 0xA:
case 0xB: DecodeDataProcessing(instr); break;
// 2: Logical immediate.
// Move wide immediate.
case 0x2: DecodeLogical(instr); break;
// 3: Bitfield.
// Extract.
case 0x3: DecodeBitfieldExtract(instr); break;
// 4: Unconditional branch immediate.
// Exception generation.
// Compare and branch immediate.
// 5: Compare and branch immediate.
// Conditional branch.
// System.
// 6,7: Unconditional branch.
// Test and branch immediate.
case 0x4:
case 0x5:
case 0x6:
case 0x7: DecodeBranchSystemException(instr); break;
// 8,9: Load/store register pair post-index.
// Load register literal.
// Load/store register unscaled immediate.
// Load/store register immediate post-index.
// Load/store register immediate pre-index.
// Load/store register offset.
// Load/store exclusive.
// C,D: Load/store register pair offset.
// Load/store register pair pre-index.
// Load/store register unsigned immediate.
// Advanced SIMD.
case 0x8:
case 0x9:
case 0xC:
case 0xD: DecodeLoadStore(instr); break;
// E: FP fixed point conversion.
// FP integer conversion.
// FP data processing 1 source.
// FP compare.
// FP immediate.
// FP data processing 2 source.
// FP conditional compare.
// FP conditional select.
// Advanced SIMD.
// F: FP data processing 3 source.
// Advanced SIMD.
case 0xE:
case 0xF: DecodeFP(instr); break;
}
}
}
void Decoder::AppendVisitor(DecoderVisitor* new_visitor) {
visitors_.push_back(new_visitor);
}
void Decoder::PrependVisitor(DecoderVisitor* new_visitor) {
visitors_.push_front(new_visitor);
}
void Decoder::InsertVisitorBefore(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor) {
std::list<DecoderVisitor*>::iterator it;
for (it = visitors_.begin(); it != visitors_.end(); it++) {
if (*it == registered_visitor) {
visitors_.insert(it, new_visitor);
return;
}
}
// We reached the end of the list. The last element must be
// registered_visitor.
VIXL_ASSERT(*it == registered_visitor);
visitors_.insert(it, new_visitor);
}
void Decoder::InsertVisitorAfter(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor) {
std::list<DecoderVisitor*>::iterator it;
for (it = visitors_.begin(); it != visitors_.end(); it++) {
if (*it == registered_visitor) {
it++;
visitors_.insert(it, new_visitor);
return;
}
}
// We reached the end of the list. The last element must be
// registered_visitor.
VIXL_ASSERT(*it == registered_visitor);
visitors_.push_back(new_visitor);
}
void Decoder::RemoveVisitor(DecoderVisitor* visitor) {
visitors_.remove(visitor);
}
void Decoder::DecodePCRelAddressing(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x0);
// We know bit 28 is set, as <b28:b27> = 0 is filtered out at the top level
// decode.
VIXL_ASSERT(instr->Bit(28) == 0x1);
VisitPCRelAddressing(instr);
}
void Decoder::DecodeBranchSystemException(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0x4) ||
(instr->Bits(27, 24) == 0x5) ||
(instr->Bits(27, 24) == 0x6) ||
(instr->Bits(27, 24) == 0x7) );
switch (instr->Bits(31, 29)) {
case 0:
case 4: {
VisitUnconditionalBranch(instr);
break;
}
case 1:
case 5: {
if (instr->Bit(25) == 0) {
VisitCompareBranch(instr);
} else {
VisitTestBranch(instr);
}
break;
}
case 2: {
if (instr->Bit(25) == 0) {
if ((instr->Bit(24) == 0x1) ||
(instr->Mask(0x01000010) == 0x00000010)) {
VisitUnallocated(instr);
} else {
VisitConditionalBranch(instr);
}
} else {
VisitUnallocated(instr);
}
break;
}
case 6: {
if (instr->Bit(25) == 0) {
if (instr->Bit(24) == 0) {
if ((instr->Bits(4, 2) != 0) ||
(instr->Mask(0x00E0001D) == 0x00200001) ||
(instr->Mask(0x00E0001D) == 0x00400001) ||
(instr->Mask(0x00E0001E) == 0x00200002) ||
(instr->Mask(0x00E0001E) == 0x00400002) ||
(instr->Mask(0x00E0001C) == 0x00600000) ||
(instr->Mask(0x00E0001C) == 0x00800000) ||
(instr->Mask(0x00E0001F) == 0x00A00000) ||
(instr->Mask(0x00C0001C) == 0x00C00000)) {
VisitUnallocated(instr);
} else {
VisitException(instr);
}
} else {
if (instr->Bits(23, 22) == 0) {
const Instr masked_003FF0E0 = instr->Mask(0x003FF0E0);
if ((instr->Bits(21, 19) == 0x4) ||
(masked_003FF0E0 == 0x00033000) ||
(masked_003FF0E0 == 0x003FF020) ||
(masked_003FF0E0 == 0x003FF060) ||
(masked_003FF0E0 == 0x003FF0E0) ||
(instr->Mask(0x00388000) == 0x00008000) ||
(instr->Mask(0x0038E000) == 0x00000000) ||
(instr->Mask(0x0039E000) == 0x00002000) ||
(instr->Mask(0x003AE000) == 0x00002000) ||
(instr->Mask(0x003CE000) == 0x00042000) ||
(instr->Mask(0x003FFFC0) == 0x000320C0) ||
(instr->Mask(0x003FF100) == 0x00032100) ||
(instr->Mask(0x003FF200) == 0x00032200) ||
(instr->Mask(0x003FF400) == 0x00032400) ||
(instr->Mask(0x003FF800) == 0x00032800) ||
(instr->Mask(0x0038F000) == 0x00005000) ||
(instr->Mask(0x0038E000) == 0x00006000)) {
VisitUnallocated(instr);
} else {
VisitSystem(instr);
}
} else {
VisitUnallocated(instr);
}
}
} else {
if ((instr->Bit(24) == 0x1) ||
(instr->Bits(20, 16) != 0x1F) ||
(instr->Bits(15, 10) != 0) ||
(instr->Bits(4, 0) != 0) ||
(instr->Bits(24, 21) == 0x3) ||
(instr->Bits(24, 22) == 0x3)) {
VisitUnallocated(instr);
} else {
VisitUnconditionalBranchToRegister(instr);
}
}
break;
}
case 3:
case 7: {
VisitUnallocated(instr);
break;
}
}
}
void Decoder::DecodeLoadStore(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0x8) ||
(instr->Bits(27, 24) == 0x9) ||
(instr->Bits(27, 24) == 0xC) ||
(instr->Bits(27, 24) == 0xD) );
// TODO(all): rearrange the tree to integrate this branch.
if ((instr->Bit(28) == 0) && (instr->Bit(29) == 0) && (instr->Bit(26) == 1)) {
DecodeNEONLoadStore(instr);
return;
}
if (instr->Bit(24) == 0) {
if (instr->Bit(28) == 0) {
if (instr->Bit(29) == 0) {
if (instr->Bit(26) == 0) {
VisitLoadStoreExclusive(instr);
} else {
VIXL_UNREACHABLE();
}
} else {
if ((instr->Bits(31, 30) == 0x3) ||
(instr->Mask(0xC4400000) == 0x40000000)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(23) == 0) {
if (instr->Mask(0xC4400000) == 0xC0400000) {
VisitUnallocated(instr);
} else {
VisitLoadStorePairNonTemporal(instr);
}
} else {
VisitLoadStorePairPostIndex(instr);
}
}
}
} else {
if (instr->Bit(29) == 0) {
if (instr->Mask(0xC4000000) == 0xC4000000) {
VisitUnallocated(instr);
} else {
VisitLoadLiteral(instr);
}
} else {
if ((instr->Mask(0x84C00000) == 0x80C00000) ||
(instr->Mask(0x44800000) == 0x44800000) ||
(instr->Mask(0x84800000) == 0x84800000)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(21) == 0) {
switch (instr->Bits(11, 10)) {
case 0: {
VisitLoadStoreUnscaledOffset(instr);
break;
}
case 1: {
if (instr->Mask(0xC4C00000) == 0xC0800000) {
VisitUnallocated(instr);
} else {
VisitLoadStorePostIndex(instr);
}
break;
}
case 2: {
// TODO: VisitLoadStoreRegisterOffsetUnpriv.
VisitUnimplemented(instr);
break;
}
case 3: {
if (instr->Mask(0xC4C00000) == 0xC0800000) {
VisitUnallocated(instr);
} else {
VisitLoadStorePreIndex(instr);
}
break;
}
}
} else {
if (instr->Bits(11, 10) == 0x2) {
if (instr->Bit(14) == 0) {
VisitUnallocated(instr);
} else {
VisitLoadStoreRegisterOffset(instr);
}
} else {
VisitUnallocated(instr);
}
}
}
}
}
} else {
if (instr->Bit(28) == 0) {
if (instr->Bit(29) == 0) {
VisitUnallocated(instr);
} else {
if ((instr->Bits(31, 30) == 0x3) ||
(instr->Mask(0xC4400000) == 0x40000000)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(23) == 0) {
VisitLoadStorePairOffset(instr);
} else {
VisitLoadStorePairPreIndex(instr);
}
}
}
} else {
if (instr->Bit(29) == 0) {
VisitUnallocated(instr);
} else {
if ((instr->Mask(0x84C00000) == 0x80C00000) ||
(instr->Mask(0x44800000) == 0x44800000) ||
(instr->Mask(0x84800000) == 0x84800000)) {
VisitUnallocated(instr);
} else {
VisitLoadStoreUnsignedOffset(instr);
}
}
}
}
}
void Decoder::DecodeLogical(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x2);
if (instr->Mask(0x80400000) == 0x00400000) {
VisitUnallocated(instr);
} else {
if (instr->Bit(23) == 0) {
VisitLogicalImmediate(instr);
} else {
if (instr->Bits(30, 29) == 0x1) {
VisitUnallocated(instr);
} else {
VisitMoveWideImmediate(instr);
}
}
}
}
void Decoder::DecodeBitfieldExtract(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x3);
if ((instr->Mask(0x80400000) == 0x80000000) ||
(instr->Mask(0x80400000) == 0x00400000) ||
(instr->Mask(0x80008000) == 0x00008000)) {
VisitUnallocated(instr);
} else if (instr->Bit(23) == 0) {
if ((instr->Mask(0x80200000) == 0x00200000) ||
(instr->Mask(0x60000000) == 0x60000000)) {
VisitUnallocated(instr);
} else {
VisitBitfield(instr);
}
} else {
if ((instr->Mask(0x60200000) == 0x00200000) ||
(instr->Mask(0x60000000) != 0x00000000)) {
VisitUnallocated(instr);
} else {
VisitExtract(instr);
}
}
}
void Decoder::DecodeAddSubImmediate(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(27, 24) == 0x1);
if (instr->Bit(23) == 1) {
VisitUnallocated(instr);
} else {
VisitAddSubImmediate(instr);
}
}
void Decoder::DecodeDataProcessing(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0xA) ||
(instr->Bits(27, 24) == 0xB));
if (instr->Bit(24) == 0) {
if (instr->Bit(28) == 0) {
if (instr->Mask(0x80008000) == 0x00008000) {
VisitUnallocated(instr);
} else {
VisitLogicalShifted(instr);
}
} else {
switch (instr->Bits(23, 21)) {
case 0: {
if (instr->Mask(0x0000FC00) != 0) {
VisitUnallocated(instr);
} else {
VisitAddSubWithCarry(instr);
}
break;
}
case 2: {
if ((instr->Bit(29) == 0) ||
(instr->Mask(0x00000410) != 0)) {
VisitUnallocated(instr);
} else {
if (instr->Bit(11) == 0) {
VisitConditionalCompareRegister(instr);
} else {
VisitConditionalCompareImmediate(instr);
}
}
break;
}
case 4: {
if (instr->Mask(0x20000800) != 0x00000000) {
VisitUnallocated(instr);
} else {
VisitConditionalSelect(instr);
}
break;
}
case 6: {
if (instr->Bit(29) == 0x1) {
VisitUnallocated(instr);
VIXL_FALLTHROUGH();
} else {
if (instr->Bit(30) == 0) {
if ((instr->Bit(15) == 0x1) ||
(instr->Bits(15, 11) == 0) ||
(instr->Bits(15, 12) == 0x1) ||
(instr->Bits(15, 12) == 0x3) ||
(instr->Bits(15, 13) == 0x3) ||
(instr->Mask(0x8000EC00) == 0x00004C00) ||
(instr->Mask(0x8000E800) == 0x80004000) ||
(instr->Mask(0x8000E400) == 0x80004000)) {
VisitUnallocated(instr);
} else {
VisitDataProcessing2Source(instr);
}
} else {
if ((instr->Bit(13) == 1) ||
(instr->Bits(20, 16) != 0) ||
(instr->Bits(15, 14) != 0) ||
(instr->Mask(0xA01FFC00) == 0x00000C00) ||
(instr->Mask(0x201FF800) == 0x00001800)) {
VisitUnallocated(instr);
} else {
VisitDataProcessing1Source(instr);
}
}
break;
}
}
case 1:
case 3:
case 5:
case 7: VisitUnallocated(instr); break;
}
}
} else {
if (instr->Bit(28) == 0) {
if (instr->Bit(21) == 0) {
if ((instr->Bits(23, 22) == 0x3) ||
(instr->Mask(0x80008000) == 0x00008000)) {
VisitUnallocated(instr);
} else {
VisitAddSubShifted(instr);
}
} else {
if ((instr->Mask(0x00C00000) != 0x00000000) ||
(instr->Mask(0x00001400) == 0x00001400) ||
(instr->Mask(0x00001800) == 0x00001800)) {
VisitUnallocated(instr);
} else {
VisitAddSubExtended(instr);
}
}
} else {
if ((instr->Bit(30) == 0x1) ||
(instr->Bits(30, 29) == 0x1) ||
(instr->Mask(0xE0600000) == 0x00200000) ||
(instr->Mask(0xE0608000) == 0x00400000) ||
(instr->Mask(0x60608000) == 0x00408000) ||
(instr->Mask(0x60E00000) == 0x00E00000) ||
(instr->Mask(0x60E00000) == 0x00800000) ||
(instr->Mask(0x60E00000) == 0x00600000)) {
VisitUnallocated(instr);
} else {
VisitDataProcessing3Source(instr);
}
}
}
}
void Decoder::DecodeFP(const Instruction* instr) {
VIXL_ASSERT((instr->Bits(27, 24) == 0xE) ||
(instr->Bits(27, 24) == 0xF));
if (instr->Bit(28) == 0) {
DecodeNEONVectorDataProcessing(instr);
} else {
if (instr->Bits(31, 30) == 0x3) {
VisitUnallocated(instr);
} else if (instr->Bits(31, 30) == 0x1) {
DecodeNEONScalarDataProcessing(instr);
} else {
if (instr->Bit(29) == 0) {
if (instr->Bit(24) == 0) {
if (instr->Bit(21) == 0) {
if ((instr->Bit(23) == 1) ||
(instr->Bit(18) == 1) ||
(instr->Mask(0x80008000) == 0x00000000) ||
(instr->Mask(0x000E0000) == 0x00000000) ||
(instr->Mask(0x000E0000) == 0x000A0000) ||
(instr->Mask(0x00160000) == 0x00000000) ||
(instr->Mask(0x00160000) == 0x00120000)) {
VisitUnallocated(instr);
} else {
VisitFPFixedPointConvert(instr);
}
} else {
if (instr->Bits(15, 10) == 32) {
VisitUnallocated(instr);
} else if (instr->Bits(15, 10) == 0) {
if ((instr->Bits(23, 22) == 0x3) ||
(instr->Mask(0x000E0000) == 0x000A0000) ||
(instr->Mask(0x000E0000) == 0x000C0000) ||
(instr->Mask(0x00160000) == 0x00120000) ||
(instr->Mask(0x00160000) == 0x00140000) ||
(instr->Mask(0x20C40000) == 0x00800000) ||
(instr->Mask(0x20C60000) == 0x00840000) ||
(instr->Mask(0xA0C60000) == 0x80060000) ||
(instr->Mask(0xA0C60000) == 0x00860000) ||
(instr->Mask(0xA0C60000) == 0x00460000) ||
(instr->Mask(0xA0CE0000) == 0x80860000) ||
(instr->Mask(0xA0CE0000) == 0x804E0000) ||
(instr->Mask(0xA0CE0000) == 0x000E0000) ||
(instr->Mask(0xA0D60000) == 0x00160000) ||
(instr->Mask(0xA0D60000) == 0x80560000) ||
(instr->Mask(0xA0D60000) == 0x80960000)) {
VisitUnallocated(instr);
} else {
VisitFPIntegerConvert(instr);
}
} else if (instr->Bits(14, 10) == 16) {
const Instr masked_A0DF8000 = instr->Mask(0xA0DF8000);
if ((instr->Mask(0x80180000) != 0) ||
(masked_A0DF8000 == 0x00020000) ||
(masked_A0DF8000 == 0x00030000) ||
(masked_A0DF8000 == 0x00068000) ||
(masked_A0DF8000 == 0x00428000) ||
(masked_A0DF8000 == 0x00430000) ||
(masked_A0DF8000 == 0x00468000) ||
(instr->Mask(0xA0D80000) == 0x00800000) ||
(instr->Mask(0xA0DE0000) == 0x00C00000) ||
(instr->Mask(0xA0DF0000) == 0x00C30000) ||
(instr->Mask(0xA0DC0000) == 0x00C40000)) {
VisitUnallocated(instr);
} else {
VisitFPDataProcessing1Source(instr);
}
} else if (instr->Bits(13, 10) == 8) {
if ((instr->Bits(15, 14) != 0) ||
(instr->Bits(2, 0) != 0) ||
(instr->Mask(0x80800000) != 0x00000000)) {
VisitUnallocated(instr);
} else {
VisitFPCompare(instr);
}
} else if (instr->Bits(12, 10) == 4) {
if ((instr->Bits(9, 5) != 0) ||
(instr->Mask(0x80800000) != 0x00000000)) {
VisitUnallocated(instr);
} else {
VisitFPImmediate(instr);
}
} else {
if (instr->Mask(0x80800000) != 0x00000000) {
VisitUnallocated(instr);
} else {
switch (instr->Bits(11, 10)) {
case 1: {
VisitFPConditionalCompare(instr);
break;
}
case 2: {
if ((instr->Bits(15, 14) == 0x3) ||
(instr->Mask(0x00009000) == 0x00009000) ||
(instr->Mask(0x0000A000) == 0x0000A000)) {
VisitUnallocated(instr);
} else {
VisitFPDataProcessing2Source(instr);
}
break;
}
case 3: {
VisitFPConditionalSelect(instr);
break;
}
default: VIXL_UNREACHABLE();
}
}
}
}
} else {
// Bit 30 == 1 has been handled earlier.
VIXL_ASSERT(instr->Bit(30) == 0);
if (instr->Mask(0xA0800000) != 0) {
VisitUnallocated(instr);
} else {
VisitFPDataProcessing3Source(instr);
}
}
} else {
VisitUnallocated(instr);
}
}
}
}
void Decoder::DecodeNEONLoadStore(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(29, 25) == 0x6);
if (instr->Bit(31) == 0) {
if ((instr->Bit(24) == 0) && (instr->Bit(21) == 1)) {
VisitUnallocated(instr);
return;
}
if (instr->Bit(23) == 0) {
if (instr->Bits(20, 16) == 0) {
if (instr->Bit(24) == 0) {
VisitNEONLoadStoreMultiStruct(instr);
} else {
VisitNEONLoadStoreSingleStruct(instr);
}
} else {
VisitUnallocated(instr);
}
} else {
if (instr->Bit(24) == 0) {
VisitNEONLoadStoreMultiStructPostIndex(instr);
} else {
VisitNEONLoadStoreSingleStructPostIndex(instr);
}
}
} else {
VisitUnallocated(instr);
}
}
void Decoder::DecodeNEONVectorDataProcessing(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(28, 25) == 0x7);
if (instr->Bit(31) == 0) {
if (instr->Bit(24) == 0) {
if (instr->Bit(21) == 0) {
if (instr->Bit(15) == 0) {
if (instr->Bit(10) == 0) {
if (instr->Bit(29) == 0) {
if (instr->Bit(11) == 0) {
VisitNEONTable(instr);
} else {
VisitNEONPerm(instr);
}
} else {
VisitNEONExtract(instr);
}
} else {
if (instr->Bits(23, 22) == 0) {
VisitNEONCopy(instr);
} else {
VisitUnallocated(instr);
}
}
} else {
VisitUnallocated(instr);
}
} else {
if (instr->Bit(10) == 0) {
if (instr->Bit(11) == 0) {
VisitNEON3Different(instr);
} else {
if (instr->Bits(18, 17) == 0) {
if (instr->Bit(20) == 0) {
if (instr->Bit(19) == 0) {
VisitNEON2RegMisc(instr);
} else {
if (instr->Bits(30, 29) == 0x2) {
VisitCryptoAES(instr);
} else {
VisitUnallocated(instr);
}
}
} else {
if (instr->Bit(19) == 0) {
VisitNEONAcrossLanes(instr);
} else {
VisitUnallocated(instr);
}
}
} else {
VisitUnallocated(instr);
}
}
} else {
VisitNEON3Same(instr);
}
}
} else {
if (instr->Bit(10) == 0) {
VisitNEONByIndexedElement(instr);
} else {
if (instr->Bit(23) == 0) {
if (instr->Bits(22, 19) == 0) {
VisitNEONModifiedImmediate(instr);
} else {
VisitNEONShiftImmediate(instr);
}
} else {
VisitUnallocated(instr);
}
}
}
} else {
VisitUnallocated(instr);
}
}
void Decoder::DecodeNEONScalarDataProcessing(const Instruction* instr) {
VIXL_ASSERT(instr->Bits(28, 25) == 0xF);
if (instr->Bit(24) == 0) {
if (instr->Bit(21) == 0) {
if (instr->Bit(15) == 0) {
if (instr->Bit(10) == 0) {
if (instr->Bit(29) == 0) {
if (instr->Bit(11) == 0) {
VisitCrypto3RegSHA(instr);
} else {
VisitUnallocated(instr);
}
} else {
VisitUnallocated(instr);
}
} else {
if (instr->Bits(23, 22) == 0) {
VisitNEONScalarCopy(instr);
} else {
VisitUnallocated(instr);
}
}
} else {
VisitUnallocated(instr);
}
} else {
if (instr->Bit(10) == 0) {
if (instr->Bit(11) == 0) {
VisitNEONScalar3Diff(instr);
} else {
if (instr->Bits(18, 17) == 0) {
if (instr->Bit(20) == 0) {
if (instr->Bit(19) == 0) {
VisitNEONScalar2RegMisc(instr);
} else {
if (instr->Bit(29) == 0) {
VisitCrypto2RegSHA(instr);
} else {
VisitUnallocated(instr);
}
}
} else {
if (instr->Bit(19) == 0) {
VisitNEONScalarPairwise(instr);
} else {
VisitUnallocated(instr);
}
}
} else {
VisitUnallocated(instr);
}
}
} else {
VisitNEONScalar3Same(instr);
}
}
} else {
if (instr->Bit(10) == 0) {
VisitNEONScalarByIndexedElement(instr);
} else {
if (instr->Bit(23) == 0) {
VisitNEONScalarShiftImmediate(instr);
} else {
VisitUnallocated(instr);
}
}
}
}
#define DEFINE_VISITOR_CALLERS(A) \
void Decoder::Visit##A(const Instruction *instr) { \
VIXL_ASSERT(instr->Mask(A##FMask) == A##Fixed); \
std::list<DecoderVisitor*>::iterator it; \
for (it = visitors_.begin(); it != visitors_.end(); it++) { \
(*it)->Visit##A(instr); \
} \
}
VISITOR_LIST(DEFINE_VISITOR_CALLERS)
#undef DEFINE_VISITOR_CALLERS
} // namespace vixl

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// Copyright 2014, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_A64_DECODER_A64_H_
#define VIXL_A64_DECODER_A64_H_
#include <list>
#include "vixl/globals.h"
#include "vixl/a64/instructions-a64.h"
// List macro containing all visitors needed by the decoder class.
#define VISITOR_LIST_THAT_RETURN(V) \
V(PCRelAddressing) \
V(AddSubImmediate) \
V(LogicalImmediate) \
V(MoveWideImmediate) \
V(Bitfield) \
V(Extract) \
V(UnconditionalBranch) \
V(UnconditionalBranchToRegister) \
V(CompareBranch) \
V(TestBranch) \
V(ConditionalBranch) \
V(System) \
V(Exception) \
V(LoadStorePairPostIndex) \
V(LoadStorePairOffset) \
V(LoadStorePairPreIndex) \
V(LoadStorePairNonTemporal) \
V(LoadLiteral) \
V(LoadStoreUnscaledOffset) \
V(LoadStorePostIndex) \
V(LoadStorePreIndex) \
V(LoadStoreRegisterOffset) \
V(LoadStoreUnsignedOffset) \
V(LoadStoreExclusive) \
V(LogicalShifted) \
V(AddSubShifted) \
V(AddSubExtended) \
V(AddSubWithCarry) \
V(ConditionalCompareRegister) \
V(ConditionalCompareImmediate) \
V(ConditionalSelect) \
V(DataProcessing1Source) \
V(DataProcessing2Source) \
V(DataProcessing3Source) \
V(FPCompare) \
V(FPConditionalCompare) \
V(FPConditionalSelect) \
V(FPImmediate) \
V(FPDataProcessing1Source) \
V(FPDataProcessing2Source) \
V(FPDataProcessing3Source) \
V(FPIntegerConvert) \
V(FPFixedPointConvert) \
V(Crypto2RegSHA) \
V(Crypto3RegSHA) \
V(CryptoAES) \
V(NEON2RegMisc) \
V(NEON3Different) \
V(NEON3Same) \
V(NEONAcrossLanes) \
V(NEONByIndexedElement) \
V(NEONCopy) \
V(NEONExtract) \
V(NEONLoadStoreMultiStruct) \
V(NEONLoadStoreMultiStructPostIndex) \
V(NEONLoadStoreSingleStruct) \
V(NEONLoadStoreSingleStructPostIndex) \
V(NEONModifiedImmediate) \
V(NEONScalar2RegMisc) \
V(NEONScalar3Diff) \
V(NEONScalar3Same) \
V(NEONScalarByIndexedElement) \
V(NEONScalarCopy) \
V(NEONScalarPairwise) \
V(NEONScalarShiftImmediate) \
V(NEONShiftImmediate) \
V(NEONTable) \
V(NEONPerm) \
#define VISITOR_LIST_THAT_DONT_RETURN(V) \
V(Unallocated) \
V(Unimplemented) \
#define VISITOR_LIST(V) \
VISITOR_LIST_THAT_RETURN(V) \
VISITOR_LIST_THAT_DONT_RETURN(V) \
namespace vixl {
// The Visitor interface. Disassembler and simulator (and other tools)
// must provide implementations for all of these functions.
class DecoderVisitor {
public:
enum VisitorConstness {
kConstVisitor,
kNonConstVisitor
};
explicit DecoderVisitor(VisitorConstness constness = kConstVisitor)
: constness_(constness) {}
virtual ~DecoderVisitor() {}
#define DECLARE(A) virtual void Visit##A(const Instruction* instr) = 0;
VISITOR_LIST(DECLARE)
#undef DECLARE
bool IsConstVisitor() const { return constness_ == kConstVisitor; }
Instruction* MutableInstruction(const Instruction* instr) {
VIXL_ASSERT(!IsConstVisitor());
return const_cast<Instruction*>(instr);
}
private:
const VisitorConstness constness_;
};
class Decoder {
public:
Decoder() {}
// Top-level wrappers around the actual decoding function.
void Decode(const Instruction* instr) {
std::list<DecoderVisitor*>::iterator it;
for (it = visitors_.begin(); it != visitors_.end(); it++) {
VIXL_ASSERT((*it)->IsConstVisitor());
}
DecodeInstruction(instr);
}
void Decode(Instruction* instr) {
DecodeInstruction(const_cast<const Instruction*>(instr));
}
// Register a new visitor class with the decoder.
// Decode() will call the corresponding visitor method from all registered
// visitor classes when decoding reaches the leaf node of the instruction
// decode tree.
// Visitors are called in order.
// A visitor can be registered multiple times.
//
// d.AppendVisitor(V1);
// d.AppendVisitor(V2);
// d.PrependVisitor(V2);
// d.AppendVisitor(V3);
//
// d.Decode(i);
//
// will call in order visitor methods in V2, V1, V2, V3.
void AppendVisitor(DecoderVisitor* visitor);
void PrependVisitor(DecoderVisitor* visitor);
// These helpers register `new_visitor` before or after the first instance of
// `registered_visiter` in the list.
// So if
// V1, V2, V1, V2
// are registered in this order in the decoder, calls to
// d.InsertVisitorAfter(V3, V1);
// d.InsertVisitorBefore(V4, V2);
// will yield the order
// V1, V3, V4, V2, V1, V2
//
// For more complex modifications of the order of registered visitors, one can
// directly access and modify the list of visitors via the `visitors()'
// accessor.
void InsertVisitorBefore(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor);
void InsertVisitorAfter(DecoderVisitor* new_visitor,
DecoderVisitor* registered_visitor);
// Remove all instances of a previously registered visitor class from the list
// of visitors stored by the decoder.
void RemoveVisitor(DecoderVisitor* visitor);
#define DECLARE(A) void Visit##A(const Instruction* instr);
VISITOR_LIST(DECLARE)
#undef DECLARE
std::list<DecoderVisitor*>* visitors() { return &visitors_; }
private:
// Decodes an instruction and calls the visitor functions registered with the
// Decoder class.
void DecodeInstruction(const Instruction* instr);
// Decode the PC relative addressing instruction, and call the corresponding
// visitors.
// On entry, instruction bits 27:24 = 0x0.
void DecodePCRelAddressing(const Instruction* instr);
// Decode the add/subtract immediate instruction, and call the correspoding
// visitors.
// On entry, instruction bits 27:24 = 0x1.
void DecodeAddSubImmediate(const Instruction* instr);
// Decode the branch, system command, and exception generation parts of
// the instruction tree, and call the corresponding visitors.
// On entry, instruction bits 27:24 = {0x4, 0x5, 0x6, 0x7}.
void DecodeBranchSystemException(const Instruction* instr);
// Decode the load and store parts of the instruction tree, and call
// the corresponding visitors.
// On entry, instruction bits 27:24 = {0x8, 0x9, 0xC, 0xD}.
void DecodeLoadStore(const Instruction* instr);
// Decode the logical immediate and move wide immediate parts of the
// instruction tree, and call the corresponding visitors.
// On entry, instruction bits 27:24 = 0x2.
void DecodeLogical(const Instruction* instr);
// Decode the bitfield and extraction parts of the instruction tree,
// and call the corresponding visitors.
// On entry, instruction bits 27:24 = 0x3.
void DecodeBitfieldExtract(const Instruction* instr);
// Decode the data processing parts of the instruction tree, and call the
// corresponding visitors.
// On entry, instruction bits 27:24 = {0x1, 0xA, 0xB}.
void DecodeDataProcessing(const Instruction* instr);
// Decode the floating point parts of the instruction tree, and call the
// corresponding visitors.
// On entry, instruction bits 27:24 = {0xE, 0xF}.
void DecodeFP(const Instruction* instr);
// Decode the Advanced SIMD (NEON) load/store part of the instruction tree,
// and call the corresponding visitors.
// On entry, instruction bits 29:25 = 0x6.
void DecodeNEONLoadStore(const Instruction* instr);
// Decode the Advanced SIMD (NEON) vector data processing part of the
// instruction tree, and call the corresponding visitors.
// On entry, instruction bits 28:25 = 0x7.
void DecodeNEONVectorDataProcessing(const Instruction* instr);
// Decode the Advanced SIMD (NEON) scalar data processing part of the
// instruction tree, and call the corresponding visitors.
// On entry, instruction bits 28:25 = 0xF.
void DecodeNEONScalarDataProcessing(const Instruction* instr);
private:
// Visitors are registered in a list.
std::list<DecoderVisitor*> visitors_;
};
} // namespace vixl
#endif // VIXL_A64_DECODER_A64_H_

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_A64_DISASM_A64_H
#define VIXL_A64_DISASM_A64_H
#include "vixl/globals.h"
#include "vixl/utils.h"
#include "vixl/a64/instructions-a64.h"
#include "vixl/a64/decoder-a64.h"
#include "vixl/a64/assembler-a64.h"
namespace vixl {
class Disassembler: public DecoderVisitor {
public:
Disassembler();
Disassembler(char* text_buffer, int buffer_size);
virtual ~Disassembler();
char* GetOutput();
// Declare all Visitor functions.
#define DECLARE(A) virtual void Visit##A(const Instruction* instr);
VISITOR_LIST(DECLARE)
#undef DECLARE
protected:
virtual void ProcessOutput(const Instruction* instr);
// Default output functions. The functions below implement a default way of
// printing elements in the disassembly. A sub-class can override these to
// customize the disassembly output.
// Prints the name of a register.
// TODO: This currently doesn't allow renaming of V registers.
virtual void AppendRegisterNameToOutput(const Instruction* instr,
const CPURegister& reg);
// Prints a PC-relative offset. This is used for example when disassembling
// branches to immediate offsets.
virtual void AppendPCRelativeOffsetToOutput(const Instruction* instr,
int64_t offset);
// Prints an address, in the general case. It can be code or data. This is
// used for example to print the target address of an ADR instruction.
virtual void AppendCodeRelativeAddressToOutput(const Instruction* instr,
const void* addr);
// Prints the address of some code.
// This is used for example to print the target address of a branch to an
// immediate offset.
// A sub-class can for example override this method to lookup the address and
// print an appropriate name.
virtual void AppendCodeRelativeCodeAddressToOutput(const Instruction* instr,
const void* addr);
// Prints the address of some data.
// This is used for example to print the source address of a load literal
// instruction.
virtual void AppendCodeRelativeDataAddressToOutput(const Instruction* instr,
const void* addr);
// Same as the above, but for addresses that are not relative to the code
// buffer. They are currently not used by VIXL.
virtual void AppendAddressToOutput(const Instruction* instr,
const void* addr);
virtual void AppendCodeAddressToOutput(const Instruction* instr,
const void* addr);
virtual void AppendDataAddressToOutput(const Instruction* instr,
const void* addr);
public:
// Get/Set the offset that should be added to code addresses when printing
// code-relative addresses in the AppendCodeRelative<Type>AddressToOutput()
// helpers.
// Below is an example of how a branch immediate instruction in memory at
// address 0xb010200 would disassemble with different offsets.
// Base address | Disassembly
// 0x0 | 0xb010200: b #+0xcc (addr 0xb0102cc)
// 0x10000 | 0xb000200: b #+0xcc (addr 0xb0002cc)
// 0xb010200 | 0x0: b #+0xcc (addr 0xcc)
void MapCodeAddress(int64_t base_address, const Instruction* instr_address);
int64_t CodeRelativeAddress(const void* instr);
private:
void Format(
const Instruction* instr, const char* mnemonic, const char* format);
void Substitute(const Instruction* instr, const char* string);
int SubstituteField(const Instruction* instr, const char* format);
int SubstituteRegisterField(const Instruction* instr, const char* format);
int SubstituteImmediateField(const Instruction* instr, const char* format);
int SubstituteLiteralField(const Instruction* instr, const char* format);
int SubstituteBitfieldImmediateField(
const Instruction* instr, const char* format);
int SubstituteShiftField(const Instruction* instr, const char* format);
int SubstituteExtendField(const Instruction* instr, const char* format);
int SubstituteConditionField(const Instruction* instr, const char* format);
int SubstitutePCRelAddressField(const Instruction* instr, const char* format);
int SubstituteBranchTargetField(const Instruction* instr, const char* format);
int SubstituteLSRegOffsetField(const Instruction* instr, const char* format);
int SubstitutePrefetchField(const Instruction* instr, const char* format);
int SubstituteBarrierField(const Instruction* instr, const char* format);
int SubstituteSysOpField(const Instruction* instr, const char* format);
int SubstituteCrField(const Instruction* instr, const char* format);
bool RdIsZROrSP(const Instruction* instr) const {
return (instr->Rd() == kZeroRegCode);
}
bool RnIsZROrSP(const Instruction* instr) const {
return (instr->Rn() == kZeroRegCode);
}
bool RmIsZROrSP(const Instruction* instr) const {
return (instr->Rm() == kZeroRegCode);
}
bool RaIsZROrSP(const Instruction* instr) const {
return (instr->Ra() == kZeroRegCode);
}
bool IsMovzMovnImm(unsigned reg_size, uint64_t value);
int64_t code_address_offset() const { return code_address_offset_; }
protected:
void ResetOutput();
void AppendToOutput(const char* string, ...) PRINTF_CHECK(2, 3);
void set_code_address_offset(int64_t code_address_offset) {
code_address_offset_ = code_address_offset;
}
char* buffer_;
uint32_t buffer_pos_;
uint32_t buffer_size_;
bool own_buffer_;
int64_t code_address_offset_;
};
class PrintDisassembler: public Disassembler {
public:
explicit PrintDisassembler(FILE* stream) : stream_(stream) { }
protected:
virtual void ProcessOutput(const Instruction* instr);
private:
FILE *stream_;
};
} // namespace vixl
#endif // VIXL_A64_DISASM_A64_H

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "vixl/a64/instructions-a64.h"
#include "vixl/a64/assembler-a64.h"
namespace vixl {
// Floating-point infinity values.
const float16 kFP16PositiveInfinity = 0x7c00;
const float16 kFP16NegativeInfinity = 0xfc00;
const float kFP32PositiveInfinity = rawbits_to_float(0x7f800000);
const float kFP32NegativeInfinity = rawbits_to_float(0xff800000);
const double kFP64PositiveInfinity =
rawbits_to_double(UINT64_C(0x7ff0000000000000));
const double kFP64NegativeInfinity =
rawbits_to_double(UINT64_C(0xfff0000000000000));
// The default NaN values (for FPCR.DN=1).
const double kFP64DefaultNaN = rawbits_to_double(UINT64_C(0x7ff8000000000000));
const float kFP32DefaultNaN = rawbits_to_float(0x7fc00000);
const float16 kFP16DefaultNaN = 0x7e00;
static uint64_t RotateRight(uint64_t value,
unsigned int rotate,
unsigned int width) {
VIXL_ASSERT(width <= 64);
rotate &= 63;
return ((value & ((UINT64_C(1) << rotate) - 1)) <<
(width - rotate)) | (value >> rotate);
}
static uint64_t RepeatBitsAcrossReg(unsigned reg_size,
uint64_t value,
unsigned width) {
VIXL_ASSERT((width == 2) || (width == 4) || (width == 8) || (width == 16) ||
(width == 32));
VIXL_ASSERT((reg_size == kWRegSize) || (reg_size == kXRegSize));
uint64_t result = value & ((UINT64_C(1) << width) - 1);
for (unsigned i = width; i < reg_size; i *= 2) {
result |= (result << i);
}
return result;
}
bool Instruction::IsLoad() const {
if (Mask(LoadStoreAnyFMask) != LoadStoreAnyFixed) {
return false;
}
if (Mask(LoadStorePairAnyFMask) == LoadStorePairAnyFixed) {
return Mask(LoadStorePairLBit) != 0;
} else {
LoadStoreOp op = static_cast<LoadStoreOp>(Mask(LoadStoreMask));
switch (op) {
case LDRB_w:
case LDRH_w:
case LDR_w:
case LDR_x:
case LDRSB_w:
case LDRSB_x:
case LDRSH_w:
case LDRSH_x:
case LDRSW_x:
case LDR_b:
case LDR_h:
case LDR_s:
case LDR_d:
case LDR_q: return true;
default: return false;
}
}
}
bool Instruction::IsStore() const {
if (Mask(LoadStoreAnyFMask) != LoadStoreAnyFixed) {
return false;
}
if (Mask(LoadStorePairAnyFMask) == LoadStorePairAnyFixed) {
return Mask(LoadStorePairLBit) == 0;
} else {
LoadStoreOp op = static_cast<LoadStoreOp>(Mask(LoadStoreMask));
switch (op) {
case STRB_w:
case STRH_w:
case STR_w:
case STR_x:
case STR_b:
case STR_h:
case STR_s:
case STR_d:
case STR_q: return true;
default: return false;
}
}
}
// Logical immediates can't encode zero, so a return value of zero is used to
// indicate a failure case. Specifically, where the constraints on imm_s are
// not met.
uint64_t Instruction::ImmLogical() const {
unsigned reg_size = SixtyFourBits() ? kXRegSize : kWRegSize;
int32_t n = BitN();
int32_t imm_s = ImmSetBits();
int32_t imm_r = ImmRotate();
// An integer is constructed from the n, imm_s and imm_r bits according to
// the following table:
//
// N imms immr size S R
// 1 ssssss rrrrrr 64 UInt(ssssss) UInt(rrrrrr)
// 0 0sssss xrrrrr 32 UInt(sssss) UInt(rrrrr)
// 0 10ssss xxrrrr 16 UInt(ssss) UInt(rrrr)
// 0 110sss xxxrrr 8 UInt(sss) UInt(rrr)
// 0 1110ss xxxxrr 4 UInt(ss) UInt(rr)
// 0 11110s xxxxxr 2 UInt(s) UInt(r)
// (s bits must not be all set)
//
// A pattern is constructed of size bits, where the least significant S+1
// bits are set. The pattern is rotated right by R, and repeated across a
// 32 or 64-bit value, depending on destination register width.
//
if (n == 1) {
if (imm_s == 0x3f) {
return 0;
}
uint64_t bits = (UINT64_C(1) << (imm_s + 1)) - 1;
return RotateRight(bits, imm_r, 64);
} else {
if ((imm_s >> 1) == 0x1f) {
return 0;
}
for (int width = 0x20; width >= 0x2; width >>= 1) {
if ((imm_s & width) == 0) {
int mask = width - 1;
if ((imm_s & mask) == mask) {
return 0;
}
uint64_t bits = (UINT64_C(1) << ((imm_s & mask) + 1)) - 1;
return RepeatBitsAcrossReg(reg_size,
RotateRight(bits, imm_r & mask, width),
width);
}
}
}
VIXL_UNREACHABLE();
return 0;
}
uint32_t Instruction::ImmNEONabcdefgh() const {
return ImmNEONabc() << 5 | ImmNEONdefgh();
}
float Instruction::Imm8ToFP32(uint32_t imm8) {
// Imm8: abcdefgh (8 bits)
// Single: aBbb.bbbc.defg.h000.0000.0000.0000.0000 (32 bits)
// where B is b ^ 1
uint32_t bits = imm8;
uint32_t bit7 = (bits >> 7) & 0x1;
uint32_t bit6 = (bits >> 6) & 0x1;
uint32_t bit5_to_0 = bits & 0x3f;
uint32_t result = (bit7 << 31) | ((32 - bit6) << 25) | (bit5_to_0 << 19);
return rawbits_to_float(result);
}
float Instruction::ImmFP32() const {
return Imm8ToFP32(ImmFP());
}
double Instruction::Imm8ToFP64(uint32_t imm8) {
// Imm8: abcdefgh (8 bits)
// Double: aBbb.bbbb.bbcd.efgh.0000.0000.0000.0000
// 0000.0000.0000.0000.0000.0000.0000.0000 (64 bits)
// where B is b ^ 1
uint32_t bits = imm8;
uint64_t bit7 = (bits >> 7) & 0x1;
uint64_t bit6 = (bits >> 6) & 0x1;
uint64_t bit5_to_0 = bits & 0x3f;
uint64_t result = (bit7 << 63) | ((256 - bit6) << 54) | (bit5_to_0 << 48);
return rawbits_to_double(result);
}
double Instruction::ImmFP64() const {
return Imm8ToFP64(ImmFP());
}
float Instruction::ImmNEONFP32() const {
return Imm8ToFP32(ImmNEONabcdefgh());
}
double Instruction::ImmNEONFP64() const {
return Imm8ToFP64(ImmNEONabcdefgh());
}
unsigned CalcLSDataSize(LoadStoreOp op) {
VIXL_ASSERT((LSSize_offset + LSSize_width) == (kInstructionSize * 8));
unsigned size = static_cast<Instr>(op) >> LSSize_offset;
if ((op & LSVector_mask) != 0) {
// Vector register memory operations encode the access size in the "size"
// and "opc" fields.
if ((size == 0) && ((op & LSOpc_mask) >> LSOpc_offset) >= 2) {
size = kQRegSizeInBytesLog2;
}
}
return size;
}
unsigned CalcLSPairDataSize(LoadStorePairOp op) {
VIXL_STATIC_ASSERT(kXRegSizeInBytes == kDRegSizeInBytes);
VIXL_STATIC_ASSERT(kWRegSizeInBytes == kSRegSizeInBytes);
switch (op) {
case STP_q:
case LDP_q: return kQRegSizeInBytesLog2;
case STP_x:
case LDP_x:
case STP_d:
case LDP_d: return kXRegSizeInBytesLog2;
default: return kWRegSizeInBytesLog2;
}
}
int Instruction::ImmBranchRangeBitwidth(ImmBranchType branch_type) {
switch (branch_type) {
case UncondBranchType:
return ImmUncondBranch_width;
case CondBranchType:
return ImmCondBranch_width;
case CompareBranchType:
return ImmCmpBranch_width;
case TestBranchType:
return ImmTestBranch_width;
default:
VIXL_UNREACHABLE();
return 0;
}
}
int32_t Instruction::ImmBranchForwardRange(ImmBranchType branch_type) {
int32_t encoded_max = 1 << (ImmBranchRangeBitwidth(branch_type) - 1);
return encoded_max * kInstructionSize;
}
bool Instruction::IsValidImmPCOffset(ImmBranchType branch_type,
int64_t offset) {
return is_intn(ImmBranchRangeBitwidth(branch_type), offset);
}
const Instruction* Instruction::ImmPCOffsetTarget() const {
const Instruction * base = this;
ptrdiff_t offset;
if (IsPCRelAddressing()) {
// ADR and ADRP.
offset = ImmPCRel();
if (Mask(PCRelAddressingMask) == ADRP) {
base = AlignDown(base, kPageSize);
offset *= kPageSize;
} else {
VIXL_ASSERT(Mask(PCRelAddressingMask) == ADR);
}
} else {
// All PC-relative branches.
VIXL_ASSERT(BranchType() != UnknownBranchType);
// Relative branch offsets are instruction-size-aligned.
offset = ImmBranch() << kInstructionSizeLog2;
}
return base + offset;
}
int Instruction::ImmBranch() const {
switch (BranchType()) {
case CondBranchType: return ImmCondBranch();
case UncondBranchType: return ImmUncondBranch();
case CompareBranchType: return ImmCmpBranch();
case TestBranchType: return ImmTestBranch();
default: VIXL_UNREACHABLE();
}
return 0;
}
void Instruction::SetImmPCOffsetTarget(const Instruction* target) {
if (IsPCRelAddressing()) {
SetPCRelImmTarget(target);
} else {
SetBranchImmTarget(target);
}
}
void Instruction::SetPCRelImmTarget(const Instruction* target) {
ptrdiff_t imm21;
if ((Mask(PCRelAddressingMask) == ADR)) {
imm21 = target - this;
} else {
VIXL_ASSERT(Mask(PCRelAddressingMask) == ADRP);
uintptr_t this_page = reinterpret_cast<uintptr_t>(this) / kPageSize;
uintptr_t target_page = reinterpret_cast<uintptr_t>(target) / kPageSize;
imm21 = target_page - this_page;
}
Instr imm = Assembler::ImmPCRelAddress(static_cast<int32_t>(imm21));
SetInstructionBits(Mask(~ImmPCRel_mask) | imm);
}
void Instruction::SetBranchImmTarget(const Instruction* target) {
VIXL_ASSERT(((target - this) & 3) == 0);
Instr branch_imm = 0;
uint32_t imm_mask = 0;
int offset = static_cast<int>((target - this) >> kInstructionSizeLog2);
switch (BranchType()) {
case CondBranchType: {
branch_imm = Assembler::ImmCondBranch(offset);
imm_mask = ImmCondBranch_mask;
break;
}
case UncondBranchType: {
branch_imm = Assembler::ImmUncondBranch(offset);
imm_mask = ImmUncondBranch_mask;
break;
}
case CompareBranchType: {
branch_imm = Assembler::ImmCmpBranch(offset);
imm_mask = ImmCmpBranch_mask;
break;
}
case TestBranchType: {
branch_imm = Assembler::ImmTestBranch(offset);
imm_mask = ImmTestBranch_mask;
break;
}
default: VIXL_UNREACHABLE();
}
SetInstructionBits(Mask(~imm_mask) | branch_imm);
}
void Instruction::SetImmLLiteral(const Instruction* source) {
VIXL_ASSERT(IsWordAligned(source));
ptrdiff_t offset = (source - this) >> kLiteralEntrySizeLog2;
Instr imm = Assembler::ImmLLiteral(static_cast<int>(offset));
Instr mask = ImmLLiteral_mask;
SetInstructionBits(Mask(~mask) | imm);
}
VectorFormat VectorFormatHalfWidth(const VectorFormat vform) {
VIXL_ASSERT(vform == kFormat8H || vform == kFormat4S || vform == kFormat2D ||
vform == kFormatH || vform == kFormatS || vform == kFormatD);
switch (vform) {
case kFormat8H: return kFormat8B;
case kFormat4S: return kFormat4H;
case kFormat2D: return kFormat2S;
case kFormatH: return kFormatB;
case kFormatS: return kFormatH;
case kFormatD: return kFormatS;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
VectorFormat VectorFormatDoubleWidth(const VectorFormat vform) {
VIXL_ASSERT(vform == kFormat8B || vform == kFormat4H || vform == kFormat2S ||
vform == kFormatB || vform == kFormatH || vform == kFormatS);
switch (vform) {
case kFormat8B: return kFormat8H;
case kFormat4H: return kFormat4S;
case kFormat2S: return kFormat2D;
case kFormatB: return kFormatH;
case kFormatH: return kFormatS;
case kFormatS: return kFormatD;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
VectorFormat VectorFormatFillQ(const VectorFormat vform) {
switch (vform) {
case kFormatB:
case kFormat8B:
case kFormat16B: return kFormat16B;
case kFormatH:
case kFormat4H:
case kFormat8H: return kFormat8H;
case kFormatS:
case kFormat2S:
case kFormat4S: return kFormat4S;
case kFormatD:
case kFormat1D:
case kFormat2D: return kFormat2D;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
VectorFormat VectorFormatHalfWidthDoubleLanes(const VectorFormat vform) {
switch (vform) {
case kFormat4H: return kFormat8B;
case kFormat8H: return kFormat16B;
case kFormat2S: return kFormat4H;
case kFormat4S: return kFormat8H;
case kFormat1D: return kFormat2S;
case kFormat2D: return kFormat4S;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
VectorFormat VectorFormatDoubleLanes(const VectorFormat vform) {
VIXL_ASSERT(vform == kFormat8B || vform == kFormat4H || vform == kFormat2S);
switch (vform) {
case kFormat8B: return kFormat16B;
case kFormat4H: return kFormat8H;
case kFormat2S: return kFormat4S;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
VectorFormat VectorFormatHalfLanes(const VectorFormat vform) {
VIXL_ASSERT(vform == kFormat16B || vform == kFormat8H || vform == kFormat4S);
switch (vform) {
case kFormat16B: return kFormat8B;
case kFormat8H: return kFormat4H;
case kFormat4S: return kFormat2S;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
VectorFormat ScalarFormatFromLaneSize(int laneSize) {
switch (laneSize) {
case 8: return kFormatB;
case 16: return kFormatH;
case 32: return kFormatS;
case 64: return kFormatD;
default: VIXL_UNREACHABLE(); return kFormatUndefined;
}
}
unsigned RegisterSizeInBitsFromFormat(VectorFormat vform) {
VIXL_ASSERT(vform != kFormatUndefined);
switch (vform) {
case kFormatB: return kBRegSize;
case kFormatH: return kHRegSize;
case kFormatS: return kSRegSize;
case kFormatD: return kDRegSize;
case kFormat8B:
case kFormat4H:
case kFormat2S:
case kFormat1D: return kDRegSize;
default: return kQRegSize;
}
}
unsigned RegisterSizeInBytesFromFormat(VectorFormat vform) {
return RegisterSizeInBitsFromFormat(vform) / 8;
}
unsigned LaneSizeInBitsFromFormat(VectorFormat vform) {
VIXL_ASSERT(vform != kFormatUndefined);
switch (vform) {
case kFormatB:
case kFormat8B:
case kFormat16B: return 8;
case kFormatH:
case kFormat4H:
case kFormat8H: return 16;
case kFormatS:
case kFormat2S:
case kFormat4S: return 32;
case kFormatD:
case kFormat1D:
case kFormat2D: return 64;
default: VIXL_UNREACHABLE(); return 0;
}
}
int LaneSizeInBytesFromFormat(VectorFormat vform) {
return LaneSizeInBitsFromFormat(vform) / 8;
}
int LaneSizeInBytesLog2FromFormat(VectorFormat vform) {
VIXL_ASSERT(vform != kFormatUndefined);
switch (vform) {
case kFormatB:
case kFormat8B:
case kFormat16B: return 0;
case kFormatH:
case kFormat4H:
case kFormat8H: return 1;
case kFormatS:
case kFormat2S:
case kFormat4S: return 2;
case kFormatD:
case kFormat1D:
case kFormat2D: return 3;
default: VIXL_UNREACHABLE(); return 0;
}
}
int LaneCountFromFormat(VectorFormat vform) {
VIXL_ASSERT(vform != kFormatUndefined);
switch (vform) {
case kFormat16B: return 16;
case kFormat8B:
case kFormat8H: return 8;
case kFormat4H:
case kFormat4S: return 4;
case kFormat2S:
case kFormat2D: return 2;
case kFormat1D:
case kFormatB:
case kFormatH:
case kFormatS:
case kFormatD: return 1;
default: VIXL_UNREACHABLE(); return 0;
}
}
int MaxLaneCountFromFormat(VectorFormat vform) {
VIXL_ASSERT(vform != kFormatUndefined);
switch (vform) {
case kFormatB:
case kFormat8B:
case kFormat16B: return 16;
case kFormatH:
case kFormat4H:
case kFormat8H: return 8;
case kFormatS:
case kFormat2S:
case kFormat4S: return 4;
case kFormatD:
case kFormat1D:
case kFormat2D: return 2;
default: VIXL_UNREACHABLE(); return 0;
}
}
// Does 'vform' indicate a vector format or a scalar format?
bool IsVectorFormat(VectorFormat vform) {
VIXL_ASSERT(vform != kFormatUndefined);
switch (vform) {
case kFormatB:
case kFormatH:
case kFormatS:
case kFormatD: return false;
default: return true;
}
}
int64_t MaxIntFromFormat(VectorFormat vform) {
return INT64_MAX >> (64 - LaneSizeInBitsFromFormat(vform));
}
int64_t MinIntFromFormat(VectorFormat vform) {
return INT64_MIN >> (64 - LaneSizeInBitsFromFormat(vform));
}
uint64_t MaxUintFromFormat(VectorFormat vform) {
return UINT64_MAX >> (64 - LaneSizeInBitsFromFormat(vform));
}
} // namespace vixl

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_A64_INSTRUCTIONS_A64_H_
#define VIXL_A64_INSTRUCTIONS_A64_H_
#include "vixl/globals.h"
#include "vixl/utils.h"
#include "vixl/a64/constants-a64.h"
namespace vixl {
// ISA constants. --------------------------------------------------------------
typedef uint32_t Instr;
const unsigned kInstructionSize = 4;
const unsigned kInstructionSizeLog2 = 2;
const unsigned kLiteralEntrySize = 4;
const unsigned kLiteralEntrySizeLog2 = 2;
const unsigned kMaxLoadLiteralRange = 1 * MBytes;
// This is the nominal page size (as used by the adrp instruction); the actual
// size of the memory pages allocated by the kernel is likely to differ.
const unsigned kPageSize = 4 * KBytes;
const unsigned kPageSizeLog2 = 12;
const unsigned kBRegSize = 8;
const unsigned kBRegSizeLog2 = 3;
const unsigned kBRegSizeInBytes = kBRegSize / 8;
const unsigned kBRegSizeInBytesLog2 = kBRegSizeLog2 - 3;
const unsigned kHRegSize = 16;
const unsigned kHRegSizeLog2 = 4;
const unsigned kHRegSizeInBytes = kHRegSize / 8;
const unsigned kHRegSizeInBytesLog2 = kHRegSizeLog2 - 3;
const unsigned kWRegSize = 32;
const unsigned kWRegSizeLog2 = 5;
const unsigned kWRegSizeInBytes = kWRegSize / 8;
const unsigned kWRegSizeInBytesLog2 = kWRegSizeLog2 - 3;
const unsigned kXRegSize = 64;
const unsigned kXRegSizeLog2 = 6;
const unsigned kXRegSizeInBytes = kXRegSize / 8;
const unsigned kXRegSizeInBytesLog2 = kXRegSizeLog2 - 3;
const unsigned kSRegSize = 32;
const unsigned kSRegSizeLog2 = 5;
const unsigned kSRegSizeInBytes = kSRegSize / 8;
const unsigned kSRegSizeInBytesLog2 = kSRegSizeLog2 - 3;
const unsigned kDRegSize = 64;
const unsigned kDRegSizeLog2 = 6;
const unsigned kDRegSizeInBytes = kDRegSize / 8;
const unsigned kDRegSizeInBytesLog2 = kDRegSizeLog2 - 3;
const unsigned kQRegSize = 128;
const unsigned kQRegSizeLog2 = 7;
const unsigned kQRegSizeInBytes = kQRegSize / 8;
const unsigned kQRegSizeInBytesLog2 = kQRegSizeLog2 - 3;
const uint64_t kWRegMask = UINT64_C(0xffffffff);
const uint64_t kXRegMask = UINT64_C(0xffffffffffffffff);
const uint64_t kSRegMask = UINT64_C(0xffffffff);
const uint64_t kDRegMask = UINT64_C(0xffffffffffffffff);
const uint64_t kSSignMask = UINT64_C(0x80000000);
const uint64_t kDSignMask = UINT64_C(0x8000000000000000);
const uint64_t kWSignMask = UINT64_C(0x80000000);
const uint64_t kXSignMask = UINT64_C(0x8000000000000000);
const uint64_t kByteMask = UINT64_C(0xff);
const uint64_t kHalfWordMask = UINT64_C(0xffff);
const uint64_t kWordMask = UINT64_C(0xffffffff);
const uint64_t kXMaxUInt = UINT64_C(0xffffffffffffffff);
const uint64_t kWMaxUInt = UINT64_C(0xffffffff);
const int64_t kXMaxInt = INT64_C(0x7fffffffffffffff);
const int64_t kXMinInt = INT64_C(0x8000000000000000);
const int32_t kWMaxInt = INT32_C(0x7fffffff);
const int32_t kWMinInt = INT32_C(0x80000000);
const unsigned kLinkRegCode = 30;
const unsigned kZeroRegCode = 31;
const unsigned kSPRegInternalCode = 63;
const unsigned kRegCodeMask = 0x1f;
const unsigned kAddressTagOffset = 56;
const unsigned kAddressTagWidth = 8;
const uint64_t kAddressTagMask =
((UINT64_C(1) << kAddressTagWidth) - 1) << kAddressTagOffset;
VIXL_STATIC_ASSERT(kAddressTagMask == UINT64_C(0xff00000000000000));
// AArch64 floating-point specifics. These match IEEE-754.
const unsigned kDoubleMantissaBits = 52;
const unsigned kDoubleExponentBits = 11;
const unsigned kFloatMantissaBits = 23;
const unsigned kFloatExponentBits = 8;
const unsigned kFloat16MantissaBits = 10;
const unsigned kFloat16ExponentBits = 5;
// Floating-point infinity values.
extern const float16 kFP16PositiveInfinity;
extern const float16 kFP16NegativeInfinity;
extern const float kFP32PositiveInfinity;
extern const float kFP32NegativeInfinity;
extern const double kFP64PositiveInfinity;
extern const double kFP64NegativeInfinity;
// The default NaN values (for FPCR.DN=1).
extern const float16 kFP16DefaultNaN;
extern const float kFP32DefaultNaN;
extern const double kFP64DefaultNaN;
unsigned CalcLSDataSize(LoadStoreOp op);
unsigned CalcLSPairDataSize(LoadStorePairOp op);
enum ImmBranchType {
UnknownBranchType = 0,
CondBranchType = 1,
UncondBranchType = 2,
CompareBranchType = 3,
TestBranchType = 4
};
enum AddrMode {
Offset,
PreIndex,
PostIndex
};
enum FPRounding {
// The first four values are encodable directly by FPCR<RMode>.
FPTieEven = 0x0,
FPPositiveInfinity = 0x1,
FPNegativeInfinity = 0x2,
FPZero = 0x3,
// The final rounding modes are only available when explicitly specified by
// the instruction (such as with fcvta). It cannot be set in FPCR.
FPTieAway,
FPRoundOdd
};
enum Reg31Mode {
Reg31IsStackPointer,
Reg31IsZeroRegister
};
// Instructions. ---------------------------------------------------------------
class Instruction {
public:
Instr InstructionBits() const {
return *(reinterpret_cast<const Instr*>(this));
}
void SetInstructionBits(Instr new_instr) {
*(reinterpret_cast<Instr*>(this)) = new_instr;
}
int Bit(int pos) const {
return (InstructionBits() >> pos) & 1;
}
uint32_t Bits(int msb, int lsb) const {
return unsigned_bitextract_32(msb, lsb, InstructionBits());
}
int32_t SignedBits(int msb, int lsb) const {
int32_t bits = *(reinterpret_cast<const int32_t*>(this));
return signed_bitextract_32(msb, lsb, bits);
}
Instr Mask(uint32_t mask) const {
return InstructionBits() & mask;
}
#define DEFINE_GETTER(Name, HighBit, LowBit, Func) \
int32_t Name() const { return Func(HighBit, LowBit); }
INSTRUCTION_FIELDS_LIST(DEFINE_GETTER)
#undef DEFINE_GETTER
// ImmPCRel is a compound field (not present in INSTRUCTION_FIELDS_LIST),
// formed from ImmPCRelLo and ImmPCRelHi.
int ImmPCRel() const {
int offset =
static_cast<int>((ImmPCRelHi() << ImmPCRelLo_width) | ImmPCRelLo());
int width = ImmPCRelLo_width + ImmPCRelHi_width;
return signed_bitextract_32(width - 1, 0, offset);
}
uint64_t ImmLogical() const;
unsigned ImmNEONabcdefgh() const;
float ImmFP32() const;
double ImmFP64() const;
float ImmNEONFP32() const;
double ImmNEONFP64() const;
unsigned SizeLS() const {
return CalcLSDataSize(static_cast<LoadStoreOp>(Mask(LoadStoreMask)));
}
unsigned SizeLSPair() const {
return CalcLSPairDataSize(
static_cast<LoadStorePairOp>(Mask(LoadStorePairMask)));
}
int NEONLSIndex(int access_size_shift) const {
int64_t q = NEONQ();
int64_t s = NEONS();
int64_t size = NEONLSSize();
int64_t index = (q << 3) | (s << 2) | size;
return static_cast<int>(index >> access_size_shift);
}
// Helpers.
bool IsCondBranchImm() const {
return Mask(ConditionalBranchFMask) == ConditionalBranchFixed;
}
bool IsUncondBranchImm() const {
return Mask(UnconditionalBranchFMask) == UnconditionalBranchFixed;
}
bool IsCompareBranch() const {
return Mask(CompareBranchFMask) == CompareBranchFixed;
}
bool IsTestBranch() const {
return Mask(TestBranchFMask) == TestBranchFixed;
}
bool IsImmBranch() const {
return BranchType() != UnknownBranchType;
}
bool IsPCRelAddressing() const {
return Mask(PCRelAddressingFMask) == PCRelAddressingFixed;
}
bool IsLogicalImmediate() const {
return Mask(LogicalImmediateFMask) == LogicalImmediateFixed;
}
bool IsAddSubImmediate() const {
return Mask(AddSubImmediateFMask) == AddSubImmediateFixed;
}
bool IsAddSubExtended() const {
return Mask(AddSubExtendedFMask) == AddSubExtendedFixed;
}
bool IsLoadOrStore() const {
return Mask(LoadStoreAnyFMask) == LoadStoreAnyFixed;
}
bool IsLoad() const;
bool IsStore() const;
bool IsLoadLiteral() const {
// This includes PRFM_lit.
return Mask(LoadLiteralFMask) == LoadLiteralFixed;
}
bool IsMovn() const {
return (Mask(MoveWideImmediateMask) == MOVN_x) ||
(Mask(MoveWideImmediateMask) == MOVN_w);
}
static int ImmBranchRangeBitwidth(ImmBranchType branch_type);
static int32_t ImmBranchForwardRange(ImmBranchType branch_type);
static bool IsValidImmPCOffset(ImmBranchType branch_type, int64_t offset);
// Indicate whether Rd can be the stack pointer or the zero register. This
// does not check that the instruction actually has an Rd field.
Reg31Mode RdMode() const {
// The following instructions use sp or wsp as Rd:
// Add/sub (immediate) when not setting the flags.
// Add/sub (extended) when not setting the flags.
// Logical (immediate) when not setting the flags.
// Otherwise, r31 is the zero register.
if (IsAddSubImmediate() || IsAddSubExtended()) {
if (Mask(AddSubSetFlagsBit)) {
return Reg31IsZeroRegister;
} else {
return Reg31IsStackPointer;
}
}
if (IsLogicalImmediate()) {
// Of the logical (immediate) instructions, only ANDS (and its aliases)
// can set the flags. The others can all write into sp.
// Note that some logical operations are not available to
// immediate-operand instructions, so we have to combine two masks here.
if (Mask(LogicalImmediateMask & LogicalOpMask) == ANDS) {
return Reg31IsZeroRegister;
} else {
return Reg31IsStackPointer;
}
}
return Reg31IsZeroRegister;
}
// Indicate whether Rn can be the stack pointer or the zero register. This
// does not check that the instruction actually has an Rn field.
Reg31Mode RnMode() const {
// The following instructions use sp or wsp as Rn:
// All loads and stores.
// Add/sub (immediate).
// Add/sub (extended).
// Otherwise, r31 is the zero register.
if (IsLoadOrStore() || IsAddSubImmediate() || IsAddSubExtended()) {
return Reg31IsStackPointer;
}
return Reg31IsZeroRegister;
}
ImmBranchType BranchType() const {
if (IsCondBranchImm()) {
return CondBranchType;
} else if (IsUncondBranchImm()) {
return UncondBranchType;
} else if (IsCompareBranch()) {
return CompareBranchType;
} else if (IsTestBranch()) {
return TestBranchType;
} else {
return UnknownBranchType;
}
}
// Find the target of this instruction. 'this' may be a branch or a
// PC-relative addressing instruction.
const Instruction* ImmPCOffsetTarget() const;
// Patch a PC-relative offset to refer to 'target'. 'this' may be a branch or
// a PC-relative addressing instruction.
void SetImmPCOffsetTarget(const Instruction* target);
// Patch a literal load instruction to load from 'source'.
void SetImmLLiteral(const Instruction* source);
// The range of a load literal instruction, expressed as 'instr +- range'.
// The range is actually the 'positive' range; the branch instruction can
// target [instr - range - kInstructionSize, instr + range].
static const int kLoadLiteralImmBitwidth = 19;
static const int kLoadLiteralRange =
(1 << kLoadLiteralImmBitwidth) / 2 - kInstructionSize;
// Calculate the address of a literal referred to by a load-literal
// instruction, and return it as the specified type.
//
// The literal itself is safely mutable only if the backing buffer is safely
// mutable.
template <typename T>
T LiteralAddress() const {
uint64_t base_raw = reinterpret_cast<uint64_t>(this);
int64_t offset = ImmLLiteral() << kLiteralEntrySizeLog2;
uint64_t address_raw = base_raw + offset;
// Cast the address using a C-style cast. A reinterpret_cast would be
// appropriate, but it can't cast one integral type to another.
T address = (T)(address_raw);
// Assert that the address can be represented by the specified type.
VIXL_ASSERT((uint64_t)(address) == address_raw);
return address;
}
uint32_t Literal32() const {
uint32_t literal;
memcpy(&literal, LiteralAddress<const void*>(), sizeof(literal));
return literal;
}
uint64_t Literal64() const {
uint64_t literal;
memcpy(&literal, LiteralAddress<const void*>(), sizeof(literal));
return literal;
}
float LiteralFP32() const {
return rawbits_to_float(Literal32());
}
double LiteralFP64() const {
return rawbits_to_double(Literal64());
}
const Instruction* NextInstruction() const {
return this + kInstructionSize;
}
const Instruction* InstructionAtOffset(int64_t offset) const {
VIXL_ASSERT(IsWordAligned(this + offset));
return this + offset;
}
template<typename T> static Instruction* Cast(T src) {
return reinterpret_cast<Instruction*>(src);
}
template<typename T> static const Instruction* CastConst(T src) {
return reinterpret_cast<const Instruction*>(src);
}
private:
int ImmBranch() const;
static float Imm8ToFP32(uint32_t imm8);
static double Imm8ToFP64(uint32_t imm8);
void SetPCRelImmTarget(const Instruction* target);
void SetBranchImmTarget(const Instruction* target);
};
// Functions for handling NEON vector format information.
enum VectorFormat {
kFormatUndefined = 0xffffffff,
kFormat8B = NEON_8B,
kFormat16B = NEON_16B,
kFormat4H = NEON_4H,
kFormat8H = NEON_8H,
kFormat2S = NEON_2S,
kFormat4S = NEON_4S,
kFormat1D = NEON_1D,
kFormat2D = NEON_2D,
// Scalar formats. We add the scalar bit to distinguish between scalar and
// vector enumerations; the bit is always set in the encoding of scalar ops
// and always clear for vector ops. Although kFormatD and kFormat1D appear
// to be the same, their meaning is subtly different. The first is a scalar
// operation, the second a vector operation that only affects one lane.
kFormatB = NEON_B | NEONScalar,
kFormatH = NEON_H | NEONScalar,
kFormatS = NEON_S | NEONScalar,
kFormatD = NEON_D | NEONScalar
};
VectorFormat VectorFormatHalfWidth(const VectorFormat vform);
VectorFormat VectorFormatDoubleWidth(const VectorFormat vform);
VectorFormat VectorFormatDoubleLanes(const VectorFormat vform);
VectorFormat VectorFormatHalfLanes(const VectorFormat vform);
VectorFormat ScalarFormatFromLaneSize(int lanesize);
VectorFormat VectorFormatHalfWidthDoubleLanes(const VectorFormat vform);
VectorFormat VectorFormatFillQ(const VectorFormat vform);
unsigned RegisterSizeInBitsFromFormat(VectorFormat vform);
unsigned RegisterSizeInBytesFromFormat(VectorFormat vform);
// TODO: Make the return types of these functions consistent.
unsigned LaneSizeInBitsFromFormat(VectorFormat vform);
int LaneSizeInBytesFromFormat(VectorFormat vform);
int LaneSizeInBytesLog2FromFormat(VectorFormat vform);
int LaneCountFromFormat(VectorFormat vform);
int MaxLaneCountFromFormat(VectorFormat vform);
bool IsVectorFormat(VectorFormat vform);
int64_t MaxIntFromFormat(VectorFormat vform);
int64_t MinIntFromFormat(VectorFormat vform);
uint64_t MaxUintFromFormat(VectorFormat vform);
enum NEONFormat {
NF_UNDEF = 0,
NF_8B = 1,
NF_16B = 2,
NF_4H = 3,
NF_8H = 4,
NF_2S = 5,
NF_4S = 6,
NF_1D = 7,
NF_2D = 8,
NF_B = 9,
NF_H = 10,
NF_S = 11,
NF_D = 12
};
static const unsigned kNEONFormatMaxBits = 6;
struct NEONFormatMap {
// The bit positions in the instruction to consider.
uint8_t bits[kNEONFormatMaxBits];
// Mapping from concatenated bits to format.
NEONFormat map[1 << kNEONFormatMaxBits];
};
class NEONFormatDecoder {
public:
enum SubstitutionMode {
kPlaceholder,
kFormat
};
// Construct a format decoder with increasingly specific format maps for each
// subsitution. If no format map is specified, the default is the integer
// format map.
explicit NEONFormatDecoder(const Instruction* instr) {
instrbits_ = instr->InstructionBits();
SetFormatMaps(IntegerFormatMap());
}
NEONFormatDecoder(const Instruction* instr,
const NEONFormatMap* format) {
instrbits_ = instr->InstructionBits();
SetFormatMaps(format);
}
NEONFormatDecoder(const Instruction* instr,
const NEONFormatMap* format0,
const NEONFormatMap* format1) {
instrbits_ = instr->InstructionBits();
SetFormatMaps(format0, format1);
}
NEONFormatDecoder(const Instruction* instr,
const NEONFormatMap* format0,
const NEONFormatMap* format1,
const NEONFormatMap* format2) {
instrbits_ = instr->InstructionBits();
SetFormatMaps(format0, format1, format2);
}
// Set the format mapping for all or individual substitutions.
void SetFormatMaps(const NEONFormatMap* format0,
const NEONFormatMap* format1 = NULL,
const NEONFormatMap* format2 = NULL) {
VIXL_ASSERT(format0 != NULL);
formats_[0] = format0;
formats_[1] = (format1 == NULL) ? formats_[0] : format1;
formats_[2] = (format2 == NULL) ? formats_[1] : format2;
}
void SetFormatMap(unsigned index, const NEONFormatMap* format) {
VIXL_ASSERT(index <= (sizeof(formats_) / sizeof(formats_[0])));
VIXL_ASSERT(format != NULL);
formats_[index] = format;
}
// Substitute %s in the input string with the placeholder string for each
// register, ie. "'B", "'H", etc.
const char* SubstitutePlaceholders(const char* string) {
return Substitute(string, kPlaceholder, kPlaceholder, kPlaceholder);
}
// Substitute %s in the input string with a new string based on the
// substitution mode.
const char* Substitute(const char* string,
SubstitutionMode mode0 = kFormat,
SubstitutionMode mode1 = kFormat,
SubstitutionMode mode2 = kFormat) {
snprintf(form_buffer_, sizeof(form_buffer_), string,
GetSubstitute(0, mode0),
GetSubstitute(1, mode1),
GetSubstitute(2, mode2));
return form_buffer_;
}
// Append a "2" to a mnemonic string based of the state of the Q bit.
const char* Mnemonic(const char* mnemonic) {
if ((instrbits_ & NEON_Q) != 0) {
snprintf(mne_buffer_, sizeof(mne_buffer_), "%s2", mnemonic);
return mne_buffer_;
}
return mnemonic;
}
VectorFormat GetVectorFormat(int format_index = 0) {
return GetVectorFormat(formats_[format_index]);
}
VectorFormat GetVectorFormat(const NEONFormatMap* format_map) {
static const VectorFormat vform[] = {
kFormatUndefined,
kFormat8B, kFormat16B, kFormat4H, kFormat8H,
kFormat2S, kFormat4S, kFormat1D, kFormat2D,
kFormatB, kFormatH, kFormatS, kFormatD
};
VIXL_ASSERT(GetNEONFormat(format_map) < (sizeof(vform) / sizeof(vform[0])));
return vform[GetNEONFormat(format_map)];
}
// Built in mappings for common cases.
// The integer format map uses three bits (Q, size<1:0>) to encode the
// "standard" set of NEON integer vector formats.
static const NEONFormatMap* IntegerFormatMap() {
static const NEONFormatMap map = {
{23, 22, 30},
{NF_8B, NF_16B, NF_4H, NF_8H, NF_2S, NF_4S, NF_UNDEF, NF_2D}
};
return &map;
}
// The long integer format map uses two bits (size<1:0>) to encode the
// long set of NEON integer vector formats. These are used in narrow, wide
// and long operations.
static const NEONFormatMap* LongIntegerFormatMap() {
static const NEONFormatMap map = {
{23, 22}, {NF_8H, NF_4S, NF_2D}
};
return &map;
}
// The FP format map uses two bits (Q, size<0>) to encode the NEON FP vector
// formats: NF_2S, NF_4S, NF_2D.
static const NEONFormatMap* FPFormatMap() {
// The FP format map assumes two bits (Q, size<0>) are used to encode the
// NEON FP vector formats: NF_2S, NF_4S, NF_2D.
static const NEONFormatMap map = {
{22, 30}, {NF_2S, NF_4S, NF_UNDEF, NF_2D}
};
return &map;
}
// The load/store format map uses three bits (Q, 11, 10) to encode the
// set of NEON vector formats.
static const NEONFormatMap* LoadStoreFormatMap() {
static const NEONFormatMap map = {
{11, 10, 30},
{NF_8B, NF_16B, NF_4H, NF_8H, NF_2S, NF_4S, NF_1D, NF_2D}
};
return &map;
}
// The logical format map uses one bit (Q) to encode the NEON vector format:
// NF_8B, NF_16B.
static const NEONFormatMap* LogicalFormatMap() {
static const NEONFormatMap map = {
{30}, {NF_8B, NF_16B}
};
return &map;
}
// The triangular format map uses between two and five bits to encode the NEON
// vector format:
// xxx10->8B, xxx11->16B, xx100->4H, xx101->8H
// x1000->2S, x1001->4S, 10001->2D, all others undefined.
static const NEONFormatMap* TriangularFormatMap() {
static const NEONFormatMap map = {
{19, 18, 17, 16, 30},
{NF_UNDEF, NF_UNDEF, NF_8B, NF_16B, NF_4H, NF_8H, NF_8B, NF_16B, NF_2S,
NF_4S, NF_8B, NF_16B, NF_4H, NF_8H, NF_8B, NF_16B, NF_UNDEF, NF_2D,
NF_8B, NF_16B, NF_4H, NF_8H, NF_8B, NF_16B, NF_2S, NF_4S, NF_8B, NF_16B,
NF_4H, NF_8H, NF_8B, NF_16B}
};
return &map;
}
// The scalar format map uses two bits (size<1:0>) to encode the NEON scalar
// formats: NF_B, NF_H, NF_S, NF_D.
static const NEONFormatMap* ScalarFormatMap() {
static const NEONFormatMap map = {
{23, 22}, {NF_B, NF_H, NF_S, NF_D}
};
return &map;
}
// The long scalar format map uses two bits (size<1:0>) to encode the longer
// NEON scalar formats: NF_H, NF_S, NF_D.
static const NEONFormatMap* LongScalarFormatMap() {
static const NEONFormatMap map = {
{23, 22}, {NF_H, NF_S, NF_D}
};
return &map;
}
// The FP scalar format map assumes one bit (size<0>) is used to encode the
// NEON FP scalar formats: NF_S, NF_D.
static const NEONFormatMap* FPScalarFormatMap() {
static const NEONFormatMap map = {
{22}, {NF_S, NF_D}
};
return &map;
}
// The triangular scalar format map uses between one and four bits to encode
// the NEON FP scalar formats:
// xxx1->B, xx10->H, x100->S, 1000->D, all others undefined.
static const NEONFormatMap* TriangularScalarFormatMap() {
static const NEONFormatMap map = {
{19, 18, 17, 16},
{NF_UNDEF, NF_B, NF_H, NF_B, NF_S, NF_B, NF_H, NF_B,
NF_D, NF_B, NF_H, NF_B, NF_S, NF_B, NF_H, NF_B}
};
return &map;
}
private:
// Get a pointer to a string that represents the format or placeholder for
// the specified substitution index, based on the format map and instruction.
const char* GetSubstitute(int index, SubstitutionMode mode) {
if (mode == kFormat) {
return NEONFormatAsString(GetNEONFormat(formats_[index]));
}
VIXL_ASSERT(mode == kPlaceholder);
return NEONFormatAsPlaceholder(GetNEONFormat(formats_[index]));
}
// Get the NEONFormat enumerated value for bits obtained from the
// instruction based on the specified format mapping.
NEONFormat GetNEONFormat(const NEONFormatMap* format_map) {
return format_map->map[PickBits(format_map->bits)];
}
// Convert a NEONFormat into a string.
static const char* NEONFormatAsString(NEONFormat format) {
static const char* formats[] = {
"undefined",
"8b", "16b", "4h", "8h", "2s", "4s", "1d", "2d",
"b", "h", "s", "d"
};
VIXL_ASSERT(format < (sizeof(formats) / sizeof(formats[0])));
return formats[format];
}
// Convert a NEONFormat into a register placeholder string.
static const char* NEONFormatAsPlaceholder(NEONFormat format) {
VIXL_ASSERT((format == NF_B) || (format == NF_H) ||
(format == NF_S) || (format == NF_D) ||
(format == NF_UNDEF));
static const char* formats[] = {
"undefined",
"undefined", "undefined", "undefined", "undefined",
"undefined", "undefined", "undefined", "undefined",
"'B", "'H", "'S", "'D"
};
return formats[format];
}
// Select bits from instrbits_ defined by the bits array, concatenate them,
// and return the value.
uint8_t PickBits(const uint8_t bits[]) {
uint8_t result = 0;
for (unsigned b = 0; b < kNEONFormatMaxBits; b++) {
if (bits[b] == 0) break;
result <<= 1;
result |= ((instrbits_ & (1 << bits[b])) == 0) ? 0 : 1;
}
return result;
}
Instr instrbits_;
const NEONFormatMap* formats_[3];
char form_buffer_[64];
char mne_buffer_[16];
};
} // namespace vixl
#endif // VIXL_A64_INSTRUCTIONS_A64_H_

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@ -1,113 +0,0 @@
// Copyright 2014, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_CODE_BUFFER_H
#define VIXL_CODE_BUFFER_H
#include <cstring>
#include "vixl/globals.h"
namespace vixl {
class CodeBuffer {
public:
explicit CodeBuffer(size_t capacity = 4 * KBytes);
CodeBuffer(void* buffer, size_t capacity);
~CodeBuffer();
void Reset();
ptrdiff_t OffsetFrom(ptrdiff_t offset) const {
ptrdiff_t cursor_offset = cursor_ - buffer_;
VIXL_ASSERT((offset >= 0) && (offset <= cursor_offset));
return cursor_offset - offset;
}
ptrdiff_t CursorOffset() const {
return OffsetFrom(0);
}
template <typename T>
T GetOffsetAddress(ptrdiff_t offset) const {
VIXL_ASSERT((offset >= 0) && (offset <= (cursor_ - buffer_)));
return reinterpret_cast<T>(buffer_ + offset);
}
size_t RemainingBytes() const {
VIXL_ASSERT((cursor_ >= buffer_) && (cursor_ <= (buffer_ + capacity_)));
return (buffer_ + capacity_) - cursor_;
}
// A code buffer can emit:
// * 32-bit data: instruction and constant.
// * 64-bit data: constant.
// * string: debug info.
void Emit32(uint32_t data) { Emit(data); }
void Emit64(uint64_t data) { Emit(data); }
void EmitString(const char* string);
// Align to kInstructionSize.
void Align();
size_t capacity() const { return capacity_; }
bool IsManaged() const { return managed_; }
void Grow(size_t new_capacity);
bool IsDirty() const { return dirty_; }
void SetClean() { dirty_ = false; }
private:
template <typename T>
void Emit(T value) {
VIXL_ASSERT(RemainingBytes() >= sizeof(value));
dirty_ = true;
memcpy(cursor_, &value, sizeof(value));
cursor_ += sizeof(value);
}
// Backing store of the buffer.
byte* buffer_;
// If true the backing store is allocated and deallocated by the buffer. The
// backing store can then grow on demand. If false the backing store is
// provided by the user and cannot be resized internally.
bool managed_;
// Pointer to the next location to be written.
byte* cursor_;
// True if there has been any write since the buffer was created or cleaned.
bool dirty_;
// Capacity in bytes of the backing store.
size_t capacity_;
};
} // namespace vixl
#endif // VIXL_CODE_BUFFER_H

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "compiler-intrinsics.h"
namespace vixl {
int CountLeadingSignBitsFallBack(int64_t value, int width) {
VIXL_ASSERT(IsPowerOf2(width) && (width <= 64));
if (value >= 0) {
return CountLeadingZeros(value, width) - 1;
} else {
return CountLeadingZeros(~value, width) - 1;
}
}
int CountLeadingZerosFallBack(uint64_t value, int width) {
VIXL_ASSERT(IsPowerOf2(width) && (width <= 64));
if (value == 0) {
return width;
}
int count = 0;
value = value << (64 - width);
if ((value & UINT64_C(0xffffffff00000000)) == 0) {
count += 32;
value = value << 32;
}
if ((value & UINT64_C(0xffff000000000000)) == 0) {
count += 16;
value = value << 16;
}
if ((value & UINT64_C(0xff00000000000000)) == 0) {
count += 8;
value = value << 8;
}
if ((value & UINT64_C(0xf000000000000000)) == 0) {
count += 4;
value = value << 4;
}
if ((value & UINT64_C(0xc000000000000000)) == 0) {
count += 2;
value = value << 2;
}
if ((value & UINT64_C(0x8000000000000000)) == 0) {
count += 1;
}
count += (value == 0);
return count;
}
int CountSetBitsFallBack(uint64_t value, int width) {
VIXL_ASSERT(IsPowerOf2(width) && (width <= 64));
// Mask out unused bits to ensure that they are not counted.
value &= (UINT64_C(0xffffffffffffffff) >> (64 - width));
// Add up the set bits.
// The algorithm works by adding pairs of bit fields together iteratively,
// where the size of each bit field doubles each time.
// An example for an 8-bit value:
// Bits: h g f e d c b a
// \ | \ | \ | \ |
// value = h+g f+e d+c b+a
// \ | \ |
// value = h+g+f+e d+c+b+a
// \ |
// value = h+g+f+e+d+c+b+a
const uint64_t kMasks[] = {
UINT64_C(0x5555555555555555),
UINT64_C(0x3333333333333333),
UINT64_C(0x0f0f0f0f0f0f0f0f),
UINT64_C(0x00ff00ff00ff00ff),
UINT64_C(0x0000ffff0000ffff),
UINT64_C(0x00000000ffffffff),
};
for (unsigned i = 0; i < (sizeof(kMasks) / sizeof(kMasks[0])); i++) {
int shift = 1 << i;
value = ((value >> shift) & kMasks[i]) + (value & kMasks[i]);
}
return static_cast<int>(value);
}
int CountTrailingZerosFallBack(uint64_t value, int width) {
VIXL_ASSERT(IsPowerOf2(width) && (width <= 64));
int count = 0;
value = value << (64 - width);
if ((value & UINT64_C(0xffffffff)) == 0) {
count += 32;
value = value >> 32;
}
if ((value & 0xffff) == 0) {
count += 16;
value = value >> 16;
}
if ((value & 0xff) == 0) {
count += 8;
value = value >> 8;
}
if ((value & 0xf) == 0) {
count += 4;
value = value >> 4;
}
if ((value & 0x3) == 0) {
count += 2;
value = value >> 2;
}
if ((value & 0x1) == 0) {
count += 1;
}
count += (value == 0);
return count - (64 - width);
}
} // namespace vixl

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_COMPILER_INTRINSICS_H
#define VIXL_COMPILER_INTRINSICS_H
#include "globals.h"
namespace vixl {
// Helper to check whether the version of GCC used is greater than the specified
// requirement.
#define MAJOR 1000000
#define MINOR 1000
#if defined(__GNUC__) && defined(__GNUC_MINOR__) && defined(__GNUC_PATCHLEVEL__)
#define GCC_VERSION_OR_NEWER(major, minor, patchlevel) \
((__GNUC__ * MAJOR + __GNUC_MINOR__ * MINOR + __GNUC_PATCHLEVEL__) >= \
((major) * MAJOR + (minor) * MINOR + (patchlevel)))
#elif defined(__GNUC__) && defined(__GNUC_MINOR__)
#define GCC_VERSION_OR_NEWER(major, minor, patchlevel) \
((__GNUC__ * MAJOR + __GNUC_MINOR__ * MINOR) >= \
((major) * MAJOR + (minor) * MINOR + (patchlevel)))
#else
#define GCC_VERSION_OR_NEWER(major, minor, patchlevel) 0
#endif
#if defined(__clang__) && !defined(VIXL_NO_COMPILER_BUILTINS)
#define COMPILER_HAS_BUILTIN_CLRSB (__has_builtin(__builtin_clrsb))
#define COMPILER_HAS_BUILTIN_CLZ (__has_builtin(__builtin_clz))
#define COMPILER_HAS_BUILTIN_CTZ (__has_builtin(__builtin_ctz))
#define COMPILER_HAS_BUILTIN_FFS (__has_builtin(__builtin_ffs))
#define COMPILER_HAS_BUILTIN_POPCOUNT (__has_builtin(__builtin_popcount))
#elif defined(__GNUC__) && !defined(VIXL_NO_COMPILER_BUILTINS)
// The documentation for these builtins is available at:
// https://gcc.gnu.org/onlinedocs/gcc-$MAJOR.$MINOR.$PATCHLEVEL/gcc//Other-Builtins.html
# define COMPILER_HAS_BUILTIN_CLRSB (GCC_VERSION_OR_NEWER(4, 7, 0))
# define COMPILER_HAS_BUILTIN_CLZ (GCC_VERSION_OR_NEWER(3, 4, 0))
# define COMPILER_HAS_BUILTIN_CTZ (GCC_VERSION_OR_NEWER(3, 4, 0))
# define COMPILER_HAS_BUILTIN_FFS (GCC_VERSION_OR_NEWER(3, 4, 0))
# define COMPILER_HAS_BUILTIN_POPCOUNT (GCC_VERSION_OR_NEWER(3, 4, 0))
#else
// One can define VIXL_NO_COMPILER_BUILTINS to force using the manually
// implemented C++ methods.
#define COMPILER_HAS_BUILTIN_BSWAP false
#define COMPILER_HAS_BUILTIN_CLRSB false
#define COMPILER_HAS_BUILTIN_CLZ false
#define COMPILER_HAS_BUILTIN_CTZ false
#define COMPILER_HAS_BUILTIN_FFS false
#define COMPILER_HAS_BUILTIN_POPCOUNT false
#endif
template<typename V>
inline bool IsPowerOf2(V value) {
return (value != 0) && ((value & (value - 1)) == 0);
}
// Declaration of fallback functions.
int CountLeadingSignBitsFallBack(int64_t value, int width);
int CountLeadingZerosFallBack(uint64_t value, int width);
int CountSetBitsFallBack(uint64_t value, int width);
int CountTrailingZerosFallBack(uint64_t value, int width);
// Implementation of intrinsics functions.
// TODO: The implementations could be improved for sizes different from 32bit
// and 64bit: we could mask the values and call the appropriate builtin.
template<typename V>
inline int CountLeadingSignBits(V value, int width = (sizeof(V) * 8)) {
#if COMPILER_HAS_BUILTIN_CLRSB
if (width == 32) {
return __builtin_clrsb(value);
} else if (width == 64) {
return __builtin_clrsbll(value);
}
#endif
return CountLeadingSignBitsFallBack(value, width);
}
template<typename V>
inline int CountLeadingZeros(V value, int width = (sizeof(V) * 8)) {
#if COMPILER_HAS_BUILTIN_CLZ
if (width == 32) {
return (value == 0) ? 32 : __builtin_clz(static_cast<unsigned>(value));
} else if (width == 64) {
return (value == 0) ? 64 : __builtin_clzll(value);
}
#endif
return CountLeadingZerosFallBack(value, width);
}
template<typename V>
inline int CountSetBits(V value, int width = (sizeof(V) * 8)) {
#if COMPILER_HAS_BUILTIN_POPCOUNT
if (width == 32) {
return __builtin_popcount(static_cast<unsigned>(value));
} else if (width == 64) {
return __builtin_popcountll(value);
}
#endif
return CountSetBitsFallBack(value, width);
}
template<typename V>
inline int CountTrailingZeros(V value, int width = (sizeof(V) * 8)) {
#if COMPILER_HAS_BUILTIN_CTZ
if (width == 32) {
return (value == 0) ? 32 : __builtin_ctz(static_cast<unsigned>(value));
} else if (width == 64) {
return (value == 0) ? 64 : __builtin_ctzll(value);
}
#endif
return CountTrailingZerosFallBack(value, width);
}
} // namespace vixl
#endif // VIXL_COMPILER_INTRINSICS_H

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_GLOBALS_H
#define VIXL_GLOBALS_H
// Get standard C99 macros for integer types.
#ifndef __STDC_CONSTANT_MACROS
#define __STDC_CONSTANT_MACROS
#endif
#ifndef __STDC_LIMIT_MACROS
#define __STDC_LIMIT_MACROS
#endif
#ifndef __STDC_FORMAT_MACROS
#define __STDC_FORMAT_MACROS
#endif
extern "C" {
#include <inttypes.h>
#include <stdint.h>
}
#include <cassert>
#include <cstdarg>
#include <cstddef>
#include <cstdio>
#include <cstdlib>
#include "vixl/platform.h"
typedef uint8_t byte;
// Type for half-precision (16 bit) floating point numbers.
typedef uint16_t float16;
const int KBytes = 1024;
const int MBytes = 1024 * KBytes;
#define VIXL_ABORT() \
do { printf("in %s, line %i", __FILE__, __LINE__); abort(); } while (false)
#ifdef VIXL_DEBUG
#define VIXL_ASSERT(condition) assert(condition)
#define VIXL_CHECK(condition) VIXL_ASSERT(condition)
#define VIXL_UNIMPLEMENTED() \
do { fprintf(stderr, "UNIMPLEMENTED\t"); VIXL_ABORT(); } while (false)
#define VIXL_UNREACHABLE() \
do { fprintf(stderr, "UNREACHABLE\t"); VIXL_ABORT(); } while (false)
#else
#define VIXL_ASSERT(condition) ((void) 0)
#define VIXL_CHECK(condition) assert(condition)
#define VIXL_UNIMPLEMENTED() ((void) 0)
#define VIXL_UNREACHABLE() ((void) 0)
#endif
// This is not as powerful as template based assertions, but it is simple.
// It assumes that the descriptions are unique. If this starts being a problem,
// we can switch to a different implemention.
#define VIXL_CONCAT(a, b) a##b
#define VIXL_STATIC_ASSERT_LINE(line, condition) \
typedef char VIXL_CONCAT(STATIC_ASSERT_LINE_, line)[(condition) ? 1 : -1] \
__attribute__((unused))
#define VIXL_STATIC_ASSERT(condition) \
VIXL_STATIC_ASSERT_LINE(__LINE__, condition)
template <typename T1>
inline void USE(T1) {}
template <typename T1, typename T2>
inline void USE(T1, T2) {}
template <typename T1, typename T2, typename T3>
inline void USE(T1, T2, T3) {}
template <typename T1, typename T2, typename T3, typename T4>
inline void USE(T1, T2, T3, T4) {}
#define VIXL_ALIGNMENT_EXCEPTION() \
do { fprintf(stderr, "ALIGNMENT EXCEPTION\t"); VIXL_ABORT(); } while (0)
// The clang::fallthrough attribute is used along with the Wimplicit-fallthrough
// argument to annotate intentional fall-through between switch labels.
// For more information please refer to:
// http://clang.llvm.org/docs/AttributeReference.html#fallthrough-clang-fallthrough
#ifndef __has_warning
#define __has_warning(x) 0
#endif
// Fallthrough annotation for Clang and C++11(201103L).
#if __has_warning("-Wimplicit-fallthrough") && __cplusplus >= 201103L
#define VIXL_FALLTHROUGH() [[clang::fallthrough]] //NOLINT
// Fallthrough annotation for GCC >= 7.
#elif __GNUC__ >= 7
#define VIXL_FALLTHROUGH() __attribute__((fallthrough))
#else
#define VIXL_FALLTHROUGH() do {} while (0)
#endif
#if __cplusplus >= 201103L
#define VIXL_NO_RETURN [[noreturn]] //NOLINT
#else
#define VIXL_NO_RETURN __attribute__((noreturn))
#endif
// Some functions might only be marked as "noreturn" for the DEBUG build. This
// macro should be used for such cases (for more details see what
// VIXL_UNREACHABLE expands to).
#ifdef VIXL_DEBUG
#define VIXL_DEBUG_NO_RETURN VIXL_NO_RETURN
#else
#define VIXL_DEBUG_NO_RETURN
#endif
#ifdef VIXL_INCLUDE_SIMULATOR
#ifndef VIXL_GENERATE_SIMULATOR_INSTRUCTIONS_VALUE
#define VIXL_GENERATE_SIMULATOR_INSTRUCTIONS_VALUE 1
#endif
#else
#ifndef VIXL_GENERATE_SIMULATOR_INSTRUCTIONS_VALUE
#define VIXL_GENERATE_SIMULATOR_INSTRUCTIONS_VALUE 0
#endif
#if VIXL_GENERATE_SIMULATOR_INSTRUCTIONS_VALUE
#warning "Generating Simulator instructions without Simulator support."
#endif
#endif
#ifdef USE_SIMULATOR
#error "Please see the release notes for USE_SIMULATOR."
#endif
#endif // VIXL_GLOBALS_H

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_INVALSET_H_
#define VIXL_INVALSET_H_
#include <cstring>
#include <algorithm>
#include <vector>
#include "vixl/globals.h"
namespace vixl {
// We define a custom data structure template and its iterator as `std`
// containers do not fit the performance requirements for some of our use cases.
//
// The structure behaves like an iterable unordered set with special properties
// and restrictions. "InvalSet" stands for "Invalidatable Set".
//
// Restrictions and requirements:
// - Adding an element already present in the set is illegal. In debug mode,
// this is checked at insertion time.
// - The templated class `ElementType` must provide comparison operators so that
// `std::sort()` can be used.
// - A key must be available to represent invalid elements.
// - Elements with an invalid key must compare higher or equal to any other
// element.
//
// Use cases and performance considerations:
// Our use cases present two specificities that allow us to design this
// structure to provide fast insertion *and* fast search and deletion
// operations:
// - Elements are (generally) inserted in order (sorted according to their key).
// - A key is available to mark elements as invalid (deleted).
// The backing `std::vector` allows for fast insertions. When
// searching for an element we ensure the elements are sorted (this is generally
// the case) and perform a binary search. When deleting an element we do not
// free the associated memory immediately. Instead, an element to be deleted is
// marked with the 'invalid' key. Other methods of the container take care of
// ignoring entries marked as invalid.
// To avoid the overhead of the `std::vector` container when only few entries
// are used, a number of elements are preallocated.
// 'ElementType' and 'KeyType' are respectively the types of the elements and
// their key. The structure only reclaims memory when safe to do so, if the
// number of elements that can be reclaimed is greater than `RECLAIM_FROM` and
// greater than `<total number of elements> / RECLAIM_FACTOR.
#define TEMPLATE_INVALSET_P_DECL \
class ElementType, \
unsigned N_PREALLOCATED_ELEMENTS, \
class KeyType, \
KeyType INVALID_KEY, \
size_t RECLAIM_FROM, \
unsigned RECLAIM_FACTOR
#define TEMPLATE_INVALSET_P_DEF \
ElementType, N_PREALLOCATED_ELEMENTS, \
KeyType, INVALID_KEY, RECLAIM_FROM, RECLAIM_FACTOR
template<class S> class InvalSetIterator; // Forward declaration.
template<TEMPLATE_INVALSET_P_DECL> class InvalSet {
public:
InvalSet();
~InvalSet();
static const size_t kNPreallocatedElements = N_PREALLOCATED_ELEMENTS;
static const KeyType kInvalidKey = INVALID_KEY;
// It is illegal to insert an element already present in the set.
void insert(const ElementType& element);
// Looks for the specified element in the set and - if found - deletes it.
void erase(const ElementType& element);
// This indicates the number of (valid) elements stored in this set.
size_t size() const;
// Returns true if no elements are stored in the set.
// Note that this does not mean the the backing storage is empty: it can still
// contain invalid elements.
bool empty() const;
void clear();
const ElementType min_element();
// This returns the key of the minimum element in the set.
KeyType min_element_key();
static bool IsValid(const ElementType& element);
static KeyType Key(const ElementType& element);
static void SetKey(ElementType* element, KeyType key);
protected:
// Returns a pointer to the element in vector_ if it was found, or NULL
// otherwise.
ElementType* Search(const ElementType& element);
// The argument *must* point to an element stored in *this* set.
// This function is not allowed to move elements in the backing vector
// storage.
void EraseInternal(ElementType* element);
// The elements in the range searched must be sorted.
ElementType* BinarySearch(const ElementType& element,
ElementType* start,
ElementType* end) const;
// Sort the elements.
enum SortType {
// The 'hard' version guarantees that invalid elements are moved to the end
// of the container.
kHardSort,
// The 'soft' version only guarantees that the elements will be sorted.
// Invalid elements may still be present anywhere in the set.
kSoftSort
};
void Sort(SortType sort_type);
// Delete the elements that have an invalid key. The complexity is linear
// with the size of the vector.
void Clean();
const ElementType Front() const;
const ElementType Back() const;
// Delete invalid trailing elements and return the last valid element in the
// set.
const ElementType CleanBack();
// Returns a pointer to the start or end of the backing storage.
const ElementType* StorageBegin() const;
const ElementType* StorageEnd() const;
ElementType* StorageBegin();
ElementType* StorageEnd();
// Returns the index of the element within the backing storage. The element
// must belong to the backing storage.
size_t ElementIndex(const ElementType* element) const;
// Returns the element at the specified index in the backing storage.
const ElementType* ElementAt(size_t index) const;
ElementType* ElementAt(size_t index);
static const ElementType* FirstValidElement(const ElementType* from,
const ElementType* end);
void CacheMinElement();
const ElementType CachedMinElement() const;
bool ShouldReclaimMemory() const;
void ReclaimMemory();
bool IsUsingVector() const { return vector_ != NULL; }
void set_sorted(bool sorted) { sorted_ = sorted; }
// We cache some data commonly required by users to improve performance.
// We cannot cache pointers to elements as we do not control the backing
// storage.
bool valid_cached_min_;
size_t cached_min_index_; // Valid iff `valid_cached_min_` is true.
KeyType cached_min_key_; // Valid iff `valid_cached_min_` is true.
// Indicates whether the elements are sorted.
bool sorted_;
// This represents the number of (valid) elements in this set.
size_t size_;
// The backing storage is either the array of preallocated elements or the
// vector. The structure starts by using the preallocated elements, and
// transitions (permanently) to using the vector once more than
// kNPreallocatedElements are used.
// Elements are only invalidated when using the vector. The preallocated
// storage always only contains valid elements.
ElementType preallocated_[kNPreallocatedElements];
std::vector<ElementType>* vector_;
#ifdef VIXL_DEBUG
// Iterators acquire and release this monitor. While a set is acquired,
// certain operations are illegal to ensure that the iterator will
// correctly iterate over the elements in the set.
int monitor_;
int monitor() const { return monitor_; }
void Acquire() { monitor_++; }
void Release() {
monitor_--;
VIXL_ASSERT(monitor_ >= 0);
}
#endif
friend class InvalSetIterator<InvalSet<TEMPLATE_INVALSET_P_DEF> >;
typedef ElementType _ElementType;
typedef KeyType _KeyType;
};
template<class S> class InvalSetIterator {
private:
// Redefine types to mirror the associated set types.
typedef typename S::_ElementType ElementType;
typedef typename S::_KeyType KeyType;
public:
explicit InvalSetIterator(S* inval_set);
~InvalSetIterator();
ElementType* Current() const;
void Advance();
bool Done() const;
// Mark this iterator as 'done'.
void Finish();
// Delete the current element and advance the iterator to point to the next
// element.
void DeleteCurrentAndAdvance();
static bool IsValid(const ElementType& element);
static KeyType Key(const ElementType& element);
protected:
void MoveToValidElement();
// Indicates if the iterator is looking at the vector or at the preallocated
// elements.
const bool using_vector_;
// Used when looking at the preallocated elements, or in debug mode when using
// the vector to track how many times the iterator has advanced.
size_t index_;
typename std::vector<ElementType>::iterator iterator_;
S* inval_set_;
};
template<TEMPLATE_INVALSET_P_DECL>
InvalSet<TEMPLATE_INVALSET_P_DEF>::InvalSet()
: valid_cached_min_(false),
sorted_(true), size_(0), vector_(NULL) {
#ifdef VIXL_DEBUG
monitor_ = 0;
#endif
}
template<TEMPLATE_INVALSET_P_DECL>
InvalSet<TEMPLATE_INVALSET_P_DEF>::~InvalSet() {
VIXL_ASSERT(monitor_ == 0);
delete vector_;
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::insert(const ElementType& element) {
VIXL_ASSERT(monitor() == 0);
VIXL_ASSERT(IsValid(element));
VIXL_ASSERT(Search(element) == NULL);
set_sorted(empty() || (sorted_ && (element > CleanBack())));
if (IsUsingVector()) {
vector_->push_back(element);
} else {
if (size_ < kNPreallocatedElements) {
preallocated_[size_] = element;
} else {
// Transition to using the vector.
vector_ = new std::vector<ElementType>(preallocated_,
preallocated_ + size_);
vector_->push_back(element);
}
}
size_++;
if (valid_cached_min_ && (element < min_element())) {
cached_min_index_ = IsUsingVector() ? vector_->size() - 1 : size_ - 1;
cached_min_key_ = Key(element);
valid_cached_min_ = true;
}
if (ShouldReclaimMemory()) {
ReclaimMemory();
}
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::erase(const ElementType& element) {
VIXL_ASSERT(monitor() == 0);
VIXL_ASSERT(IsValid(element));
ElementType* local_element = Search(element);
if (local_element != NULL) {
EraseInternal(local_element);
}
}
template<TEMPLATE_INVALSET_P_DECL>
ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::Search(
const ElementType& element) {
VIXL_ASSERT(monitor() == 0);
if (empty()) {
return NULL;
}
if (ShouldReclaimMemory()) {
ReclaimMemory();
}
if (!sorted_) {
Sort(kHardSort);
}
if (!valid_cached_min_) {
CacheMinElement();
}
return BinarySearch(element, ElementAt(cached_min_index_), StorageEnd());
}
template<TEMPLATE_INVALSET_P_DECL>
size_t InvalSet<TEMPLATE_INVALSET_P_DEF>::size() const {
return size_;
}
template<TEMPLATE_INVALSET_P_DECL>
bool InvalSet<TEMPLATE_INVALSET_P_DEF>::empty() const {
return size_ == 0;
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::clear() {
VIXL_ASSERT(monitor() == 0);
size_ = 0;
if (IsUsingVector()) {
vector_->clear();
}
set_sorted(true);
valid_cached_min_ = false;
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType InvalSet<TEMPLATE_INVALSET_P_DEF>::min_element() {
VIXL_ASSERT(monitor() == 0);
VIXL_ASSERT(!empty());
CacheMinElement();
return *ElementAt(cached_min_index_);
}
template<TEMPLATE_INVALSET_P_DECL>
KeyType InvalSet<TEMPLATE_INVALSET_P_DEF>::min_element_key() {
VIXL_ASSERT(monitor() == 0);
if (valid_cached_min_) {
return cached_min_key_;
} else {
return Key(min_element());
}
}
template<TEMPLATE_INVALSET_P_DECL>
bool InvalSet<TEMPLATE_INVALSET_P_DEF>::IsValid(const ElementType& element) {
return Key(element) != kInvalidKey;
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::EraseInternal(ElementType* element) {
// Note that this function must be safe even while an iterator has acquired
// this set.
VIXL_ASSERT(element != NULL);
size_t deleted_index = ElementIndex(element);
if (IsUsingVector()) {
VIXL_ASSERT((&(vector_->front()) <= element) &&
(element <= &(vector_->back())));
SetKey(element, kInvalidKey);
} else {
VIXL_ASSERT((preallocated_ <= element) &&
(element < (preallocated_ + kNPreallocatedElements)));
ElementType* end = preallocated_ + kNPreallocatedElements;
size_t copy_size = sizeof(*element) * (end - element - 1);
memmove(element, element + 1, copy_size);
}
size_--;
if (valid_cached_min_ &&
(deleted_index == cached_min_index_)) {
if (sorted_ && !empty()) {
const ElementType* min = FirstValidElement(element, StorageEnd());
cached_min_index_ = ElementIndex(min);
cached_min_key_ = Key(*min);
valid_cached_min_ = true;
} else {
valid_cached_min_ = false;
}
}
}
template<TEMPLATE_INVALSET_P_DECL>
ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::BinarySearch(
const ElementType& element, ElementType* start, ElementType* end) const {
if (start == end) {
return NULL;
}
VIXL_ASSERT(sorted_);
VIXL_ASSERT(start < end);
VIXL_ASSERT(!empty());
// Perform a binary search through the elements while ignoring invalid
// elements.
ElementType* elements = start;
size_t low = 0;
size_t high = (end - start) - 1;
while (low < high) {
// Find valid bounds.
while (!IsValid(elements[low]) && (low < high)) ++low;
while (!IsValid(elements[high]) && (low < high)) --high;
VIXL_ASSERT(low <= high);
// Avoid overflow when computing the middle index.
size_t middle = low / 2 + high / 2 + (low & high & 1);
if ((middle == low) || (middle == high)) {
break;
}
while (!IsValid(elements[middle]) && (middle < high - 1)) ++middle;
while (!IsValid(elements[middle]) && (low + 1 < middle)) --middle;
if (!IsValid(elements[middle])) {
break;
}
if (elements[middle] < element) {
low = middle;
} else {
high = middle;
}
}
if (elements[low] == element) return &elements[low];
if (elements[high] == element) return &elements[high];
return NULL;
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::Sort(SortType sort_type) {
VIXL_ASSERT(monitor() == 0);
if (sort_type == kSoftSort) {
if (sorted_) {
return;
}
}
if (empty()) {
return;
}
Clean();
std::sort(StorageBegin(), StorageEnd());
set_sorted(true);
cached_min_index_ = 0;
cached_min_key_ = Key(Front());
valid_cached_min_ = true;
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::Clean() {
VIXL_ASSERT(monitor() == 0);
if (empty() || !IsUsingVector()) {
return;
}
// Manually iterate through the vector storage to discard invalid elements.
ElementType* start = &(vector_->front());
ElementType* end = start + vector_->size();
ElementType* c = start;
ElementType* first_invalid;
ElementType* first_valid;
ElementType* next_invalid;
while (c < end && IsValid(*c)) { c++; }
first_invalid = c;
while (c < end) {
while (c < end && !IsValid(*c)) { c++; }
first_valid = c;
while (c < end && IsValid(*c)) { c++; }
next_invalid = c;
ptrdiff_t n_moved_elements = (next_invalid - first_valid);
memmove(first_invalid, first_valid, n_moved_elements * sizeof(*c));
first_invalid = first_invalid + n_moved_elements;
c = next_invalid;
}
// Delete the trailing invalid elements.
vector_->erase(vector_->begin() + (first_invalid - start), vector_->end());
VIXL_ASSERT(vector_->size() == size_);
if (sorted_) {
valid_cached_min_ = true;
cached_min_index_ = 0;
cached_min_key_ = Key(*ElementAt(0));
} else {
valid_cached_min_ = false;
}
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType InvalSet<TEMPLATE_INVALSET_P_DEF>::Front() const {
VIXL_ASSERT(!empty());
return IsUsingVector() ? vector_->front() : preallocated_[0];
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType InvalSet<TEMPLATE_INVALSET_P_DEF>::Back() const {
VIXL_ASSERT(!empty());
return IsUsingVector() ? vector_->back() : preallocated_[size_ - 1];
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType InvalSet<TEMPLATE_INVALSET_P_DEF>::CleanBack() {
VIXL_ASSERT(monitor() == 0);
if (IsUsingVector()) {
// Delete the invalid trailing elements.
typename std::vector<ElementType>::reverse_iterator it = vector_->rbegin();
while (!IsValid(*it)) {
it++;
}
vector_->erase(it.base(), vector_->end());
}
return Back();
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::StorageBegin() const {
return IsUsingVector() ? &(vector_->front()) : preallocated_;
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::StorageEnd() const {
return IsUsingVector() ? &(vector_->back()) + 1 : preallocated_ + size_;
}
template<TEMPLATE_INVALSET_P_DECL>
ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::StorageBegin() {
return IsUsingVector() ? &(vector_->front()) : preallocated_;
}
template<TEMPLATE_INVALSET_P_DECL>
ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::StorageEnd() {
return IsUsingVector() ? &(vector_->back()) + 1 : preallocated_ + size_;
}
template<TEMPLATE_INVALSET_P_DECL>
size_t InvalSet<TEMPLATE_INVALSET_P_DEF>::ElementIndex(
const ElementType* element) const {
VIXL_ASSERT((StorageBegin() <= element) && (element < StorageEnd()));
return element - StorageBegin();
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::ElementAt(
size_t index) const {
VIXL_ASSERT(
(IsUsingVector() && (index < vector_->size())) || (index < size_));
return StorageBegin() + index;
}
template<TEMPLATE_INVALSET_P_DECL>
ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::ElementAt(size_t index) {
VIXL_ASSERT(
(IsUsingVector() && (index < vector_->size())) || (index < size_));
return StorageBegin() + index;
}
template<TEMPLATE_INVALSET_P_DECL>
const ElementType* InvalSet<TEMPLATE_INVALSET_P_DEF>::FirstValidElement(
const ElementType* from, const ElementType* end) {
while ((from < end) && !IsValid(*from)) {
from++;
}
return from;
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::CacheMinElement() {
VIXL_ASSERT(monitor() == 0);
VIXL_ASSERT(!empty());
if (valid_cached_min_) {
return;
}
if (sorted_) {
const ElementType* min = FirstValidElement(StorageBegin(), StorageEnd());
cached_min_index_ = ElementIndex(min);
cached_min_key_ = Key(*min);
valid_cached_min_ = true;
} else {
Sort(kHardSort);
}
VIXL_ASSERT(valid_cached_min_);
}
template<TEMPLATE_INVALSET_P_DECL>
bool InvalSet<TEMPLATE_INVALSET_P_DEF>::ShouldReclaimMemory() const {
if (!IsUsingVector()) {
return false;
}
size_t n_invalid_elements = vector_->size() - size_;
return (n_invalid_elements > RECLAIM_FROM) &&
(n_invalid_elements > vector_->size() / RECLAIM_FACTOR);
}
template<TEMPLATE_INVALSET_P_DECL>
void InvalSet<TEMPLATE_INVALSET_P_DEF>::ReclaimMemory() {
VIXL_ASSERT(monitor() == 0);
Clean();
}
template<class S>
InvalSetIterator<S>::InvalSetIterator(S* inval_set)
: using_vector_((inval_set != NULL) && inval_set->IsUsingVector()),
index_(0),
inval_set_(inval_set) {
if (inval_set != NULL) {
inval_set->Sort(S::kSoftSort);
#ifdef VIXL_DEBUG
inval_set->Acquire();
#endif
if (using_vector_) {
iterator_ = typename std::vector<ElementType>::iterator(
inval_set_->vector_->begin());
}
MoveToValidElement();
}
}
template<class S>
InvalSetIterator<S>::~InvalSetIterator() {
#ifdef VIXL_DEBUG
if (inval_set_ != NULL) {
inval_set_->Release();
}
#endif
}
template<class S>
typename S::_ElementType* InvalSetIterator<S>::Current() const {
VIXL_ASSERT(!Done());
if (using_vector_) {
return &(*iterator_);
} else {
return &(inval_set_->preallocated_[index_]);
}
}
template<class S>
void InvalSetIterator<S>::Advance() {
VIXL_ASSERT(!Done());
if (using_vector_) {
iterator_++;
#ifdef VIXL_DEBUG
index_++;
#endif
MoveToValidElement();
} else {
index_++;
}
}
template<class S>
bool InvalSetIterator<S>::Done() const {
if (using_vector_) {
bool done = (iterator_ == inval_set_->vector_->end());
VIXL_ASSERT(done == (index_ == inval_set_->size()));
return done;
} else {
return index_ == inval_set_->size();
}
}
template<class S>
void InvalSetIterator<S>::Finish() {
VIXL_ASSERT(inval_set_->sorted_);
if (using_vector_) {
iterator_ = inval_set_->vector_->end();
}
index_ = inval_set_->size();
}
template<class S>
void InvalSetIterator<S>::DeleteCurrentAndAdvance() {
if (using_vector_) {
inval_set_->EraseInternal(&(*iterator_));
MoveToValidElement();
} else {
inval_set_->EraseInternal(inval_set_->preallocated_ + index_);
}
}
template<class S>
bool InvalSetIterator<S>::IsValid(const ElementType& element) {
return S::IsValid(element);
}
template<class S>
typename S::_KeyType InvalSetIterator<S>::Key(const ElementType& element) {
return S::Key(element);
}
template<class S>
void InvalSetIterator<S>::MoveToValidElement() {
if (using_vector_) {
while ((iterator_ != inval_set_->vector_->end()) && !IsValid(*iterator_)) {
iterator_++;
}
} else {
VIXL_ASSERT(inval_set_->empty() || IsValid(inval_set_->preallocated_[0]));
// Nothing to do.
}
}
#undef TEMPLATE_INVALSET_P_DECL
#undef TEMPLATE_INVALSET_P_DEF
} // namespace vixl
#endif // VIXL_INVALSET_H_

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// Copyright 2014, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef PLATFORM_H
#define PLATFORM_H
// Define platform specific functionalities.
extern "C" {
#include <signal.h>
}
namespace vixl {
inline void HostBreakpoint() { raise(SIGINT); }
} // namespace vixl
#endif

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "vixl/utils.h"
#include <cstdio>
namespace vixl {
uint32_t float_to_rawbits(float value) {
uint32_t bits = 0;
memcpy(&bits, &value, 4);
return bits;
}
uint64_t double_to_rawbits(double value) {
uint64_t bits = 0;
memcpy(&bits, &value, 8);
return bits;
}
float rawbits_to_float(uint32_t bits) {
float value = 0.0;
memcpy(&value, &bits, 4);
return value;
}
double rawbits_to_double(uint64_t bits) {
double value = 0.0;
memcpy(&value, &bits, 8);
return value;
}
uint32_t float_sign(float val) {
uint32_t rawbits = float_to_rawbits(val);
return unsigned_bitextract_32(31, 31, rawbits);
}
uint32_t float_exp(float val) {
uint32_t rawbits = float_to_rawbits(val);
return unsigned_bitextract_32(30, 23, rawbits);
}
uint32_t float_mantissa(float val) {
uint32_t rawbits = float_to_rawbits(val);
return unsigned_bitextract_32(22, 0, rawbits);
}
uint32_t double_sign(double val) {
uint64_t rawbits = double_to_rawbits(val);
return static_cast<uint32_t>(unsigned_bitextract_64(63, 63, rawbits));
}
uint32_t double_exp(double val) {
uint64_t rawbits = double_to_rawbits(val);
return static_cast<uint32_t>(unsigned_bitextract_64(62, 52, rawbits));
}
uint64_t double_mantissa(double val) {
uint64_t rawbits = double_to_rawbits(val);
return unsigned_bitextract_64(51, 0, rawbits);
}
float float_pack(uint32_t sign, uint32_t exp, uint32_t mantissa) {
uint32_t bits = (sign << 31) | (exp << 23) | mantissa;
return rawbits_to_float(bits);
}
double double_pack(uint64_t sign, uint64_t exp, uint64_t mantissa) {
uint64_t bits = (sign << 63) | (exp << 52) | mantissa;
return rawbits_to_double(bits);
}
int float16classify(float16 value) {
uint16_t exponent_max = (1 << 5) - 1;
uint16_t exponent_mask = exponent_max << 10;
uint16_t mantissa_mask = (1 << 10) - 1;
uint16_t exponent = (value & exponent_mask) >> 10;
uint16_t mantissa = value & mantissa_mask;
if (exponent == 0) {
if (mantissa == 0) {
return FP_ZERO;
}
return FP_SUBNORMAL;
} else if (exponent == exponent_max) {
if (mantissa == 0) {
return FP_INFINITE;
}
return FP_NAN;
}
return FP_NORMAL;
}
unsigned CountClearHalfWords(uint64_t imm, unsigned reg_size) {
VIXL_ASSERT((reg_size % 8) == 0);
int count = 0;
for (unsigned i = 0; i < (reg_size / 16); i++) {
if ((imm & 0xffff) == 0) {
count++;
}
imm >>= 16;
}
return count;
}
} // namespace vixl

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// Copyright 2015, ARM Limited
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// * Neither the name of ARM Limited nor the names of its contributors may be
// used to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef VIXL_UTILS_H
#define VIXL_UTILS_H
#include <cmath>
#include <cstring>
#include "vixl/globals.h"
#include "vixl/compiler-intrinsics.h"
namespace vixl {
// Macros for compile-time format checking.
#if GCC_VERSION_OR_NEWER(4, 4, 0)
#define PRINTF_CHECK(format_index, varargs_index) \
__attribute__((format(gnu_printf, format_index, varargs_index)))
#else
#define PRINTF_CHECK(format_index, varargs_index)
#endif
// Check number width.
inline bool is_intn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
int64_t limit = INT64_C(1) << (n - 1);
return (-limit <= x) && (x < limit);
}
inline bool is_uintn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
return !(x >> n);
}
inline uint32_t truncate_to_intn(unsigned n, int64_t x) {
VIXL_ASSERT((0 < n) && (n < 64));
return static_cast<uint32_t>(x & ((INT64_C(1) << n) - 1));
}
#define INT_1_TO_63_LIST(V) \
V(1) V(2) V(3) V(4) V(5) V(6) V(7) V(8) \
V(9) V(10) V(11) V(12) V(13) V(14) V(15) V(16) \
V(17) V(18) V(19) V(20) V(21) V(22) V(23) V(24) \
V(25) V(26) V(27) V(28) V(29) V(30) V(31) V(32) \
V(33) V(34) V(35) V(36) V(37) V(38) V(39) V(40) \
V(41) V(42) V(43) V(44) V(45) V(46) V(47) V(48) \
V(49) V(50) V(51) V(52) V(53) V(54) V(55) V(56) \
V(57) V(58) V(59) V(60) V(61) V(62) V(63)
#define DECLARE_IS_INT_N(N) \
inline bool is_int##N(int64_t x) { return is_intn(N, x); }
#define DECLARE_IS_UINT_N(N) \
inline bool is_uint##N(int64_t x) { return is_uintn(N, x); }
#define DECLARE_TRUNCATE_TO_INT_N(N) \
inline uint32_t truncate_to_int##N(int x) { return truncate_to_intn(N, x); }
INT_1_TO_63_LIST(DECLARE_IS_INT_N)
INT_1_TO_63_LIST(DECLARE_IS_UINT_N)
INT_1_TO_63_LIST(DECLARE_TRUNCATE_TO_INT_N)
#undef DECLARE_IS_INT_N
#undef DECLARE_IS_UINT_N
#undef DECLARE_TRUNCATE_TO_INT_N
// Bit field extraction.
inline uint32_t unsigned_bitextract_32(int msb, int lsb, uint32_t x) {
return (x >> lsb) & ((1 << (1 + msb - lsb)) - 1);
}
inline uint64_t unsigned_bitextract_64(int msb, int lsb, uint64_t x) {
return (x >> lsb) & ((static_cast<uint64_t>(1) << (1 + msb - lsb)) - 1);
}
inline int32_t signed_bitextract_32(int msb, int lsb, int32_t x) {
return (x << (31 - msb)) >> (lsb + 31 - msb);
}
inline int64_t signed_bitextract_64(int msb, int lsb, int64_t x) {
return (x << (63 - msb)) >> (lsb + 63 - msb);
}
// Floating point representation.
uint32_t float_to_rawbits(float value);
uint64_t double_to_rawbits(double value);
float rawbits_to_float(uint32_t bits);
double rawbits_to_double(uint64_t bits);
uint32_t float_sign(float val);
uint32_t float_exp(float val);
uint32_t float_mantissa(float val);
uint32_t double_sign(double val);
uint32_t double_exp(double val);
uint64_t double_mantissa(double val);
float float_pack(uint32_t sign, uint32_t exp, uint32_t mantissa);
double double_pack(uint64_t sign, uint64_t exp, uint64_t mantissa);
// An fpclassify() function for 16-bit half-precision floats.
int float16classify(float16 value);
// NaN tests.
inline bool IsSignallingNaN(double num) {
const uint64_t kFP64QuietNaNMask = UINT64_C(0x0008000000000000);
uint64_t raw = double_to_rawbits(num);
if (std::isnan(num) && ((raw & kFP64QuietNaNMask) == 0)) {
return true;
}
return false;
}
inline bool IsSignallingNaN(float num) {
const uint32_t kFP32QuietNaNMask = 0x00400000;
uint32_t raw = float_to_rawbits(num);
if (std::isnan(num) && ((raw & kFP32QuietNaNMask) == 0)) {
return true;
}
return false;
}
inline bool IsSignallingNaN(float16 num) {
const uint16_t kFP16QuietNaNMask = 0x0200;
return (float16classify(num) == FP_NAN) &&
((num & kFP16QuietNaNMask) == 0);
}
template <typename T>
inline bool IsQuietNaN(T num) {
return std::isnan(num) && !IsSignallingNaN(num);
}
// Convert the NaN in 'num' to a quiet NaN.
inline double ToQuietNaN(double num) {
const uint64_t kFP64QuietNaNMask = UINT64_C(0x0008000000000000);
VIXL_ASSERT(std::isnan(num));
return rawbits_to_double(double_to_rawbits(num) | kFP64QuietNaNMask);
}
inline float ToQuietNaN(float num) {
const uint32_t kFP32QuietNaNMask = 0x00400000;
VIXL_ASSERT(std::isnan(num));
return rawbits_to_float(float_to_rawbits(num) | kFP32QuietNaNMask);
}
// Fused multiply-add.
inline double FusedMultiplyAdd(double op1, double op2, double a) {
return fma(op1, op2, a);
}
inline float FusedMultiplyAdd(float op1, float op2, float a) {
return fmaf(op1, op2, a);
}
inline uint64_t LowestSetBit(uint64_t value) {
return value & -value;
}
template<typename T>
inline int HighestSetBitPosition(T value) {
VIXL_ASSERT(value != 0);
return (sizeof(value) * 8 - 1) - CountLeadingZeros(value);
}
template<typename V>
inline int WhichPowerOf2(V value) {
VIXL_ASSERT(IsPowerOf2(value));
return CountTrailingZeros(value);
}
unsigned CountClearHalfWords(uint64_t imm, unsigned reg_size);
template <typename T>
T ReverseBits(T value) {
VIXL_ASSERT((sizeof(value) == 1) || (sizeof(value) == 2) ||
(sizeof(value) == 4) || (sizeof(value) == 8));
T result = 0;
for (unsigned i = 0; i < (sizeof(value) * 8); i++) {
result = (result << 1) | (value & 1);
value >>= 1;
}
return result;
}
template <typename T>
T ReverseBytes(T value, int block_bytes_log2) {
VIXL_ASSERT((sizeof(value) == 4) || (sizeof(value) == 8));
VIXL_ASSERT((1U << block_bytes_log2) <= sizeof(value));
// Split the 64-bit value into an 8-bit array, where b[0] is the least
// significant byte, and b[7] is the most significant.
uint8_t bytes[8];
uint64_t mask = UINT64_C(0xff00000000000000);
for (int i = 7; i >= 0; i--) {
bytes[i] = (static_cast<uint64_t>(value) & mask) >> (i * 8);
mask >>= 8;
}
// Permutation tables for REV instructions.
// permute_table[0] is used by REV16_x, REV16_w
// permute_table[1] is used by REV32_x, REV_w
// permute_table[2] is used by REV_x
VIXL_ASSERT((0 < block_bytes_log2) && (block_bytes_log2 < 4));
static const uint8_t permute_table[3][8] = { {6, 7, 4, 5, 2, 3, 0, 1},
{4, 5, 6, 7, 0, 1, 2, 3},
{0, 1, 2, 3, 4, 5, 6, 7} };
T result = 0;
for (int i = 0; i < 8; i++) {
result <<= 8;
result |= bytes[permute_table[block_bytes_log2 - 1][i]];
}
return result;
}
// Pointer alignment
// TODO: rename/refactor to make it specific to instructions.
template<typename T>
bool IsWordAligned(T pointer) {
VIXL_ASSERT(sizeof(pointer) == sizeof(intptr_t)); // NOLINT(runtime/sizeof)
return ((intptr_t)(pointer) & 3) == 0;
}
// Increment a pointer (up to 64 bits) until it has the specified alignment.
template<class T>
T AlignUp(T pointer, size_t alignment) {
// Use C-style casts to get static_cast behaviour for integral types (T), and
// reinterpret_cast behaviour for other types.
uint64_t pointer_raw = (uint64_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) <= sizeof(pointer_raw));
size_t align_step = (alignment - pointer_raw) % alignment;
VIXL_ASSERT((pointer_raw + align_step) % alignment == 0);
return (T)(pointer_raw + align_step);
}
// Decrement a pointer (up to 64 bits) until it has the specified alignment.
template<class T>
T AlignDown(T pointer, size_t alignment) {
// Use C-style casts to get static_cast behaviour for integral types (T), and
// reinterpret_cast behaviour for other types.
uint64_t pointer_raw = (uint64_t)pointer;
VIXL_STATIC_ASSERT(sizeof(pointer) <= sizeof(pointer_raw));
size_t align_step = pointer_raw % alignment;
VIXL_ASSERT((pointer_raw - align_step) % alignment == 0);
return (T)(pointer_raw - align_step);
}
} // namespace vixl
#endif // VIXL_UTILS_H

5
disas/meson.build
View File

@ -1,9 +1,4 @@
libvixl_ss = ss.source_set()
subdir('libvixl')
common_ss.add(when: 'CONFIG_ALPHA_DIS', if_true: files('alpha.c'))
common_ss.add(when: 'CONFIG_ARM_A64_DIS', if_true: files('arm-a64.cc'))
common_ss.add_all(when: 'CONFIG_ARM_A64_DIS', if_true: libvixl_ss)
common_ss.add(when: 'CONFIG_CRIS_DIS', if_true: files('cris.c'))
common_ss.add(when: 'CONFIG_HEXAGON_DIS', if_true: files('hexagon.c'))
common_ss.add(when: 'CONFIG_HPPA_DIS', if_true: files('hppa.c'))

2
include/exec/poison.h
View File

@ -66,8 +66,6 @@
#pragma GCC poison CPU_INTERRUPT_TGT_INT_2
#pragma GCC poison CONFIG_ALPHA_DIS
#pragma GCC poison CONFIG_ARM_A64_DIS
#pragma GCC poison CONFIG_ARM_DIS
#pragma GCC poison CONFIG_CRIS_DIS
#pragma GCC poison CONFIG_HPPA_DIS
#pragma GCC poison CONFIG_I386_DIS

4
meson.build
View File

@ -250,7 +250,6 @@ endif
add_project_arguments('-iquote', '.',
'-iquote', meson.current_source_dir(),
'-iquote', meson.current_source_dir() / 'include',
'-iquote', meson.current_source_dir() / 'disas/libvixl',
language: ['c', 'cpp', 'objc'])
link_language = meson.get_external_property('link_language', 'cpp')
@ -2372,7 +2371,6 @@ config_target_mak = {}
disassemblers = {
'alpha' : ['CONFIG_ALPHA_DIS'],
'arm' : ['CONFIG_ARM_DIS'],
'avr' : ['CONFIG_AVR_DIS'],
'cris' : ['CONFIG_CRIS_DIS'],
'hexagon' : ['CONFIG_HEXAGON_DIS'],
@ -2395,8 +2393,6 @@ disassemblers = {
}
if link_language == 'cpp'
disassemblers += {
'aarch64' : [ 'CONFIG_ARM_A64_DIS'],
'arm' : [ 'CONFIG_ARM_DIS', 'CONFIG_ARM_A64_DIS'],
'mips' : [ 'CONFIG_MIPS_DIS', 'CONFIG_NANOMIPS_DIS'],
}
endif

4
scripts/clean-header-guards.pl
View File

@ -32,8 +32,8 @@ use warnings;
use Getopt::Std;
# Stuff we don't want to clean because we import it into our tree:
my $exclude = qr,^(disas/libvixl/|include/standard-headers/
|linux-headers/|pc-bios/|tests/tcg/|tests/multiboot/),x;
my $exclude = qr,^(include/standard-headers/|linux-headers/
|pc-bios/|tests/tcg/|tests/multiboot/),x;
# Stuff that is expected to fail the preprocessing test:
my $exclude_cpp = qr,^include/libdecnumber/decNumberLocal.h,;

2
scripts/clean-includes
View File

@ -51,7 +51,7 @@ GIT=no
DUPHEAD=no
# Extended regular expression defining files to ignore when using --all
XDIRREGEX='^(tests/tcg|tests/multiboot|pc-bios|disas/libvixl)'
XDIRREGEX='^(tests/tcg|tests/multiboot|pc-bios)'
while true
do

3
scripts/coverity-scan/COMPONENTS.md
View File

@ -87,9 +87,6 @@ io
ipmi
~ (/qemu)?((/include)?/hw/ipmi/.*)
libvixl
~ (/qemu)?(/disas/libvixl/.*)
migration
~ (/qemu)?((/include)?/migration/.*)

7
target/arm/cpu.c
View File

@ -828,13 +828,6 @@ static void arm_disas_set_info(CPUState *cpu, disassemble_info *info)
bool sctlr_b;
if (is_a64(env)) {
/* We might not be compiled with the A64 disassembler
* because it needs a C++ compiler. Leave print_insn
* unset in this case to use the caller default behaviour.
*/
#if defined(CONFIG_ARM_A64_DIS)
info->print_insn = print_insn_arm_a64;
#endif
info->cap_arch = CS_ARCH_ARM64;
info->cap_insn_unit = 4;
info->cap_insn_split = 4;