Upgrade V8 to version 4.9.385.28
https://chromium.googlesource.com/v8/v8/+/4.9.385.28
FPIIM-449
Change-Id: I4b2e74289d4bf3667f2f3dc8aa2e541f63e26eb4
diff --git a/src/debug/arm/debug-arm.cc b/src/debug/arm/debug-arm.cc
new file mode 100644
index 0000000..2d4cbf1
--- /dev/null
+++ b/src/debug/arm/debug-arm.cc
@@ -0,0 +1,153 @@
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#if V8_TARGET_ARCH_ARM
+
+#include "src/codegen.h"
+#include "src/debug/debug.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+
+
+void EmitDebugBreakSlot(MacroAssembler* masm) {
+ Label check_size;
+ __ bind(&check_size);
+ for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
+ __ nop(MacroAssembler::DEBUG_BREAK_NOP);
+ }
+ DCHECK_EQ(Assembler::kDebugBreakSlotInstructions,
+ masm->InstructionsGeneratedSince(&check_size));
+}
+
+
+void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode) {
+ // Generate enough nop's to make space for a call instruction. Avoid emitting
+ // the constant pool in the debug break slot code.
+ Assembler::BlockConstPoolScope block_const_pool(masm);
+ masm->RecordDebugBreakSlot(mode);
+ EmitDebugBreakSlot(masm);
+}
+
+
+void DebugCodegen::ClearDebugBreakSlot(Isolate* isolate, Address pc) {
+ CodePatcher patcher(isolate, pc, Assembler::kDebugBreakSlotInstructions);
+ EmitDebugBreakSlot(patcher.masm());
+}
+
+
+void DebugCodegen::PatchDebugBreakSlot(Isolate* isolate, Address pc,
+ Handle<Code> code) {
+ DCHECK_EQ(Code::BUILTIN, code->kind());
+ CodePatcher patcher(isolate, pc, Assembler::kDebugBreakSlotInstructions);
+ // Patch the code changing the debug break slot code from
+ // mov r2, r2
+ // mov r2, r2
+ // mov r2, r2
+ // mov r2, r2
+ // to a call to the debug break slot code.
+ // ldr ip, [pc, #0]
+ // b skip
+ // <debug break slot code entry point address>
+ // skip:
+ // blx ip
+ Label skip_constant;
+ patcher.masm()->ldr(ip, MemOperand(v8::internal::pc, 0));
+ patcher.masm()->b(&skip_constant);
+ patcher.Emit(code->entry());
+ patcher.masm()->bind(&skip_constant);
+ patcher.masm()->blx(ip);
+}
+
+
+void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
+ DebugBreakCallHelperMode mode) {
+ __ RecordComment("Debug break");
+ {
+ FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
+
+ // Load padding words on stack.
+ __ mov(ip, Operand(Smi::FromInt(LiveEdit::kFramePaddingValue)));
+ for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
+ __ push(ip);
+ }
+ __ mov(ip, Operand(Smi::FromInt(LiveEdit::kFramePaddingInitialSize)));
+ __ push(ip);
+
+ if (mode == SAVE_RESULT_REGISTER) __ push(r0);
+
+ __ mov(r0, Operand::Zero()); // no arguments
+ __ mov(r1,
+ Operand(ExternalReference(
+ Runtime::FunctionForId(Runtime::kDebugBreak), masm->isolate())));
+
+ CEntryStub ceb(masm->isolate(), 1);
+ __ CallStub(&ceb);
+
+ if (FLAG_debug_code) {
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ Register reg = {JSCallerSavedCode(i)};
+ __ mov(reg, Operand(kDebugZapValue));
+ }
+ }
+
+ if (mode == SAVE_RESULT_REGISTER) __ pop(r0);
+
+ // Don't bother removing padding bytes pushed on the stack
+ // as the frame is going to be restored right away.
+
+ // Leave the internal frame.
+ }
+
+ // Now that the break point has been handled, resume normal execution by
+ // jumping to the target address intended by the caller and that was
+ // overwritten by the address of DebugBreakXXX.
+ ExternalReference after_break_target =
+ ExternalReference::debug_after_break_target_address(masm->isolate());
+ __ mov(ip, Operand(after_break_target));
+ __ ldr(ip, MemOperand(ip));
+ __ Jump(ip);
+}
+
+
+void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
+ // Load the function pointer off of our current stack frame.
+ __ ldr(r1, MemOperand(fp,
+ StandardFrameConstants::kConstantPoolOffset - kPointerSize));
+
+ // Pop return address, frame and constant pool pointer (if
+ // FLAG_enable_embedded_constant_pool).
+ __ LeaveFrame(StackFrame::INTERNAL);
+
+ ParameterCount dummy(0);
+ __ FloodFunctionIfStepping(r1, no_reg, dummy, dummy);
+
+ { ConstantPoolUnavailableScope constant_pool_unavailable(masm);
+ // Load context from the function.
+ __ ldr(cp, FieldMemOperand(r1, JSFunction::kContextOffset));
+
+ // Clear new.target as a safety measure.
+ __ LoadRoot(r3, Heap::kUndefinedValueRootIndex);
+
+ // Get function code.
+ __ ldr(ip, FieldMemOperand(r1, JSFunction::kSharedFunctionInfoOffset));
+ __ ldr(ip, FieldMemOperand(ip, SharedFunctionInfo::kCodeOffset));
+ __ add(ip, ip, Operand(Code::kHeaderSize - kHeapObjectTag));
+
+ // Re-run JSFunction, r1 is function, cp is context.
+ __ Jump(ip);
+ }
+}
+
+
+const bool LiveEdit::kFrameDropperSupported = true;
+
+#undef __
+
+} // namespace internal
+} // namespace v8
+
+#endif // V8_TARGET_ARCH_ARM