contrib/elf2dmp: Use g_malloc(), g_new() and g_free()

QEMU coding style uses the glib memory allocation APIs, not
the raw libc malloc/free. Switch the allocation and free
calls in elf2dmp to use these functions (dropping the now-unneeded
checks for failure).

Signed-off-by: Suraj Shirvankar <surajshirvankar@gmail.com>
Message-id: 169753938460.23804.11418813007617535750-1@git.sr.ht
[PMM: also remove NULL checks from g_malloc() calls;
 beef up commit message]
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

contrib/elf2dmp/addrspace.c

@@ -72,10 +72,7 @@ int pa_space_create(struct pa_space *ps, QEMU_Elf *qemu_elf)
         }
     }
 
-    ps->block = malloc(sizeof(*ps->block) * ps->block_nr);
-    if (!ps->block) {
-        return 1;
-    }
+    ps->block = g_new(struct pa_block, ps->block_nr);
 
     for (i = 0; i < phdr_nr; i++) {
         if (phdr[i].p_type == PT_LOAD) {
@@ -97,7 +94,7 @@ int pa_space_create(struct pa_space *ps, QEMU_Elf *qemu_elf)
 void pa_space_destroy(struct pa_space *ps)
 {
     ps->block_nr = 0;
-    free(ps->block);
+    g_free(ps->block);
 }
 
 void va_space_set_dtb(struct va_space *vs, uint64_t dtb)

contrib/elf2dmp/main.c

@@ -120,14 +120,11 @@ static KDDEBUGGER_DATA64 *get_kdbg(uint64_t KernBase, struct pdb_reader *pdb,
         }
     }
 
-    kdbg = malloc(kdbg_hdr.Size);
-    if (!kdbg) {
-        return NULL;
-    }
+    kdbg = g_malloc(kdbg_hdr.Size);
 
     if (va_space_rw(vs, KdDebuggerDataBlock, kdbg, kdbg_hdr.Size, 0)) {
         eprintf("Failed to extract entire KDBG\n");
-        free(kdbg);
+        g_free(kdbg);
         return NULL;
     }
 
@@ -643,7 +640,7 @@ int main(int argc, char *argv[])
     }
 
 out_kdbg:
-    free(kdbg);
+    g_free(kdbg);
 out_pdb:
     pdb_exit(&pdb);
 out_pdb_file:

contrib/elf2dmp/pdb.c

@@ -94,18 +94,18 @@ uint64_t pdb_resolve(uint64_t img_base, struct pdb_reader *r, const char *name)
 
 static void pdb_reader_ds_exit(struct pdb_reader *r)
 {
-    free(r->ds.toc);
+    g_free(r->ds.toc);
 }
 
 static void pdb_exit_symbols(struct pdb_reader *r)
 {
-    free(r->modimage);
-    free(r->symbols);
+    g_free(r->modimage);
+    g_free(r->symbols);
 }
 
 static void pdb_exit_segments(struct pdb_reader *r)
 {
-    free(r->segs);
+    g_free(r->segs);
 }
 
 static void *pdb_ds_read(const PDB_DS_HEADER *header,
@@ -120,10 +120,7 @@ static void *pdb_ds_read(const PDB_DS_HEADER *header,
 
     nBlocks = (size + header->block_size - 1) / header->block_size;
 
-    buffer = malloc(nBlocks * header->block_size);
-    if (!buffer) {
-        return NULL;
-    }
+    buffer = g_malloc(nBlocks * header->block_size);
 
     for (i = 0; i < nBlocks; i++) {
         memcpy(buffer + i * header->block_size, (const char *)header +
@@ -206,7 +203,7 @@ static int pdb_init_symbols(struct pdb_reader *r)
     return 0;
 
 out_symbols:
-    free(symbols);
+    g_free(symbols);
 
     return err;
 }
@@ -263,7 +260,7 @@ static int pdb_reader_init(struct pdb_reader *r, void *data)
 out_sym:
     pdb_exit_symbols(r);
 out_root:
-    free(r->ds.root);
+    g_free(r->ds.root);
 out_ds:
     pdb_reader_ds_exit(r);
 
@@ -274,7 +271,7 @@ static void pdb_reader_exit(struct pdb_reader *r)
 {
     pdb_exit_segments(r);
     pdb_exit_symbols(r);
-    free(r->ds.root);
+    g_free(r->ds.root);
     pdb_reader_ds_exit(r);
 }
 

contrib/elf2dmp/qemu_elf.c

@@ -94,10 +94,7 @@ static int init_states(QEMU_Elf *qe)
 
     printf("%zu CPU states has been found\n", cpu_nr);
 
-    qe->state = malloc(sizeof(*qe->state) * cpu_nr);
-    if (!qe->state) {
-        return 1;
-    }
+    qe->state = g_new(QEMUCPUState*, cpu_nr);
 
     cpu_nr = 0;
 
@@ -115,7 +112,7 @@ static int init_states(QEMU_Elf *qe)
 
 static void exit_states(QEMU_Elf *qe)
 {
-    free(qe->state);
+    g_free(qe->state);
 }
 
 static bool check_ehdr(QEMU_Elf *qe)