Add flag to tracing element kind transitions

src/ia32/code-stubs-ia32.cc

 // Copyright 2011 the V8 project authors. 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
@@ skipping 7022 matching lines @@
   // -----------------------------------
   // Set transitioned map.
   __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx);
   __ RecordWriteField(edx,
                       HeapObject::kMapOffset,
                       ebx,
                       edi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
+
+  if (FLAG_trace_element_transitions) {
+    // Save registers and make sure return address is on top.
+    __ pop(esi);
+    __ push(eax);
+    __ push(ebx);
+    __ push(ecx);
+    __ push(edx);
+    __ push(esi);
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ push(edx);
+      __ push(Immediate(FAST_SMI_ONLY_ELEMENTS << kSmiTagSize));
+      __ push(FieldOperand(edx, JSObject::kElementsOffset));
+      __ push(Immediate(FAST_ELEMENTS << kSmiTagSize));
+      __ push(FieldOperand(edx, JSObject::kElementsOffset));
+      __ CallRuntime(Runtime::kTraceElementsKindTransition, 5);
+    }
+    // Restore registers and make sure return address is on top.
+    __ pop(esi);
+    __ pop(edx);
+    __ pop(ecx);
+    __ pop(ebx);
+    __ pop(eax);
+    __ push(esi);
+  }
 }
 
 
 void FastElementsConversionStub::GenerateSmiOnlyToDouble(
     MacroAssembler* masm, StrictModeFlag strict_mode) {
   // ----------- S t a t e -------------
   //  -- eax    : value
   //  -- ebx    : target map
   //  -- ecx    : key
   //  -- edx    : receiver
   //  -- esp[0] : return address
   // -----------------------------------
   Label loop, entry, convert_hole, gc_required;
+  // Make sure to change the following when pushing more values on the stack.
+  static int registers_already_on_stack = 2;
   __ push(eax);
   __ push(ebx);
 
   __ mov(edi, FieldOperand(edx, JSObject::kElementsOffset));
   __ mov(edi, FieldOperand(edi, FixedArray::kLengthOffset));
 
   // Allocate new FixedDoubleArray.
   // edx: receiver
   // edi: length of source FixedArray (smi-tagged)
   __ lea(esi, Operand(edi, times_4, FixedDoubleArray::kHeaderSize));
@@ skipping 12 matching lines @@
   __ RecordWriteField(edx,
                       JSObject::kElementsOffset,
                       ebx,
                       edi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 
   __ mov(edi, FieldOperand(esi, FixedArray::kLengthOffset));
 
+  if (FLAG_trace_element_transitions) {
+    static int registers_to_save = 6;
+    // Swizzle the stack so that all registers are saved below the return
+    // address, which must be at the top of stack when calling out.
+    int registers_slot_for_return_address =
+        registers_to_save + registers_already_on_stack;
+    __ sub(esp, Immediate(registers_to_save * kPointerSize));
+    __ mov(Operand(esp, 5 * kPointerSize), ebx);
+    __ mov(Operand(esp, 4 * kPointerSize), ecx);
+    __ mov(Operand(esp, 3 * kPointerSize), edx);
+    __ mov(Operand(esp, 2 * kPointerSize), esi);
+    __ mov(Operand(esp, 1 * kPointerSize), edi);
+    __ mov(ebx, Operand(esp, registers_slot_for_return_address * kPointerSize));
+    __ mov(Operand(esp, 0), ebx);
+    __ mov(Operand(esp, registers_slot_for_return_address * kPointerSize), eax);
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ push(edx);
+      __ push(Immediate(FAST_SMI_ONLY_ELEMENTS << kSmiTagSize));
+      __ push(esi);
+      __ push(Immediate(FAST_DOUBLE_ELEMENTS << kSmiTagSize));
+      __ push(eax);
+      __ CallRuntime(Runtime::kTraceElementsKindTransition, 5);
+    }
+    // Restore all the registers that were saved before the internal frame scope
+    // was created, ensuring that the return address remains on the top of
+    // stack.
+    __ mov(eax, Operand(esp, registers_slot_for_return_address * kPointerSize));
+    __ mov(ebx, Operand(esp, 0));
+    __ mov(Operand(esp, registers_slot_for_return_address * kPointerSize), ebx);
+    __ mov(ebx, Operand(esp, 5 * kPointerSize));
+    __ mov(ecx, Operand(esp, 4 * kPointerSize));
+    __ mov(edx, Operand(esp, 3 * kPointerSize));
+    __ mov(esi, Operand(esp, 2 * kPointerSize));
+    __ mov(edi, Operand(esp, 1 * kPointerSize));
+    __ add(esp, Immediate(registers_to_save * kPointerSize));
+  }
+
   // Prepare for conversion loop.
   ExternalReference canonical_the_hole_nan_reference =
       ExternalReference::address_of_the_hole_nan();
   XMMRegister the_hole_nan = xmm1;
   if (CpuFeatures::IsSupported(SSE2)) {
     CpuFeatures::Scope use_sse2(SSE2);
     __ movdbl(the_hole_nan,
               Operand::StaticVariable(canonical_the_hole_nan_reference));
   }
   __ jmp(&entry);
@@ skipping 152 matching lines @@
   // edx: receiver
   // Set transitioned map.
   __ mov(FieldOperand(edx, HeapObject::kMapOffset), ebx);
   __ RecordWriteField(edx,
                       HeapObject::kMapOffset,
                       ebx,
                       edi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
+
+  if (FLAG_trace_element_transitions) {
+    static int registers_already_on_stack = 1;
+    static int registers_to_save = 4;
+    // Swizzle the stack so that all registers are saved below the return
+    // address, which must be at the top of stack when calling out.
+    int registers_slot_for_return_address =
+        registers_to_save + registers_already_on_stack;
+    __ sub(esp, Immediate(registers_to_save * kPointerSize));
+    __ mov(Operand(esp, 3 * kPointerSize), edx);
+    __ mov(Operand(esp, 2 * kPointerSize), ecx);
+    __ mov(Operand(esp, 1 * kPointerSize), ebx);
+    __ mov(ebx, Operand(esp, registers_slot_for_return_address * kPointerSize));
+    __ mov(Operand(esp, 0), ebx);
+    __ mov(Operand(esp, registers_slot_for_return_address * kPointerSize), eax);
+    {
+      FrameScope scope(masm, StackFrame::INTERNAL);
+      __ push(edx);
+      __ push(Immediate(FAST_DOUBLE_ELEMENTS << kSmiTagSize));
+      __ push(FieldOperand(edx, JSObject::kElementsOffset));
+      __ push(Immediate(FAST_ELEMENTS << kSmiTagSize));
+      __ push(eax);
+      __ CallRuntime(Runtime::kTraceElementsKindTransition, 5);
+    }
+    // Restore all the registers that were saved before the internal frame scope
+    // was created, ensuring that the return address remains on the top of
+    // stack.
+    __ mov(eax, Operand(esp, registers_slot_for_return_address * kPointerSize));
+    __ mov(ebx, Operand(esp, 0));
+    __ mov(Operand(esp, registers_slot_for_return_address * kPointerSize), ebx);
+    __ mov(edx, Operand(esp, 3 * kPointerSize));
+    __ mov(ecx, Operand(esp, 2 * kPointerSize));
+    __ mov(ebx, Operand(esp, 1 * kPointerSize));
+    __ add(esp, Immediate(registers_to_save * kPointerSize));
+  }
+
   // Replace receiver's backing store with newly created and filled FixedArray.
   __ mov(FieldOperand(edx, JSObject::kElementsOffset), eax);
   __ RecordWriteField(edx,
                       JSObject::kElementsOffset,
                       eax,
                       edi,
                       kDontSaveFPRegs,
                       EMIT_REMEMBERED_SET,
                       OMIT_SMI_CHECK);
 
   // Restore registers.
   __ pop(eax);
   __ mov(esi, Operand(ebp, StandardFrameConstants::kContextOffset));
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32