Add class to determine the current stack size.

openscad.pro

@@ -245,6 +245,7 @@ HEADERS += src/typedefs.h \
            src/dxfdim.h \
            src/export.h \
            src/expression.h \
+           src/stackcheck.h \
            src/function.h \
            src/grid.h \
            src/highlighter.h \
@@ -321,6 +322,7 @@ SOURCES += src/version_check.cc \
            src/handle_dep.cc \
            src/value.cc \
            src/expr.cc \
+           src/stackcheck.cc \
            src/func.cc \
            src/localscope.cc \
            src/module.cc \

src/stackcheck.cc

@@ -0,0 +1,37 @@
+#include <cstdlib>
+
+#include "stackcheck.h"
+#include "PlatformUtils.h"
+
+StackCheck * StackCheck::self = 0;
+
+StackCheck::StackCheck() : ptr(0)
+{
+}
+
+StackCheck::~StackCheck()
+{
+}
+
+void StackCheck::init()
+{
+    ptr = sp();
+}
+
+unsigned long StackCheck::size()
+{
+    return std::labs(ptr - sp());
+}
+
+bool StackCheck::check()
+{
+    return size() >= PlatformUtils::stackLimit();
+}
+
+StackCheck * StackCheck::inst()
+{
+    if (self == 0) {
+        self = new StackCheck();
+    }
+    return self;
+}

src/stackcheck.h

@@ -0,0 +1,21 @@
+#pragma once
+
+class StackCheck
+{
+public:
+    StackCheck();
+    virtual ~StackCheck();
+
+    static StackCheck * inst();
+
+    void init();
+    bool check();
+    unsigned long size();
+    
+private:
+    unsigned char * sp() { unsigned char c; return &c; };
+    
+    unsigned char * ptr;
+    
+    static StackCheck *self;
+};