Add stack alignment check to ia32 and x64

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
===================================================================
--- src/ia32/macro-assembler-ia32.cc	(revision 4427)
+++ src/ia32/macro-assembler-ia32.cc	(working copy)
@@ -1535,6 +1535,21 @@
 }
 
 
+void MacroAssembler::CheckStackAlignment() {
+  int frame_alignment = OS::ActivationFrameAlignment();
+  int frame_alignment_mask = frame_alignment - 1;
+  if (frame_alignment > kPointerSize) {
+    ASSERT(IsPowerOf2(frame_alignment));
+    Label alignment_as_expected;
+    test(esp, Immediate(frame_alignment_mask));
+    j(zero, &alignment_as_expected);
+    // Abort if stack is not aligned.
+    int3();
+    bind(&alignment_as_expected);
+  }
+}
+
+
 void MacroAssembler::Abort(const char* msg) {
   // We want to pass the msg string like a smi to avoid GC
   // problems, however msg is not guaranteed to be aligned
@@ -1634,6 +1649,11 @@
 
 void MacroAssembler::CallCFunction(Register function,
                                    int num_arguments) {
+  // Check stack alignment.
+  if (FLAG_debug_code) {
+    CheckStackAlignment();
+  }
+
   call(Operand(function));
   if (OS::ActivationFrameAlignment() != 0) {
     mov(esp, Operand(esp, num_arguments * kPointerSize));