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/arm64/debug-arm64.cc b/src/debug/arm64/debug-arm64.cc
new file mode 100644
index 0000000..c2b60a9
--- /dev/null
+++ b/src/debug/arm64/debug-arm64.cc
@@ -0,0 +1,161 @@
+// Copyright 2013 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_ARM64
+
+#include "src/arm64/frames-arm64.h"
+#include "src/codegen.h"
+#include "src/debug/debug.h"
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+
+
+void EmitDebugBreakSlot(Assembler* masm) {
+ Label check_size;
+ __ bind(&check_size);
+ for (int i = 0; i < Assembler::kDebugBreakSlotInstructions; i++) {
+ __ nop(Assembler::DEBUG_BREAK_NOP);
+ }
+ DCHECK_EQ(Assembler::kDebugBreakSlotInstructions,
+ static_cast<int>(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.
+ InstructionAccurateScope scope(masm, Assembler::kDebugBreakSlotInstructions);
+ masm->RecordDebugBreakSlot(mode);
+ EmitDebugBreakSlot(masm);
+}
+
+
+void DebugCodegen::ClearDebugBreakSlot(Isolate* isolate, Address pc) {
+ PatchingAssembler patcher(isolate, reinterpret_cast<Instruction*>(pc),
+ Assembler::kDebugBreakSlotInstructions);
+ EmitDebugBreakSlot(&patcher);
+}
+
+
+void DebugCodegen::PatchDebugBreakSlot(Isolate* isolate, Address pc,
+ Handle<Code> code) {
+ DCHECK_EQ(Code::BUILTIN, code->kind());
+ PatchingAssembler patcher(isolate, reinterpret_cast<Instruction*>(pc),
+ Assembler::kDebugBreakSlotInstructions);
+ // Patch the code emitted by DebugCodegen::GenerateSlots, changing the debug
+ // break slot code from
+ // mov x0, x0 @ nop DEBUG_BREAK_NOP
+ // mov x0, x0 @ nop DEBUG_BREAK_NOP
+ // mov x0, x0 @ nop DEBUG_BREAK_NOP
+ // mov x0, x0 @ nop DEBUG_BREAK_NOP
+ // mov x0, x0 @ nop DEBUG_BREAK_NOP
+ // to a call to the debug slot code.
+ // ldr ip0, [pc, #(2 * kInstructionSize)]
+ // blr ip0
+ // b skip
+ // <debug break slot code entry point address (64 bits)>
+ // skip:
+
+ Label skip_constant;
+ // The first instruction of a patched debug break slot must be a load literal
+ // loading the address of the debug break slot code.
+ patcher.ldr_pcrel(ip0, (2 * kInstructionSize) >> kLoadLiteralScaleLog2);
+ patcher.b(&skip_constant);
+ patcher.dc64(reinterpret_cast<int64_t>(code->entry()));
+ patcher.bind(&skip_constant);
+ // TODO(all): check the following is correct.
+ // The debug break slot code will push a frame and call statically compiled
+ // code. By using blr, this call site will be registered in the frame.
+ // The debugger can now iterate on the frames to find this call.
+ patcher.blr(ip0);
+}
+
+
+void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
+ DebugBreakCallHelperMode mode) {
+ __ RecordComment("Debug break");
+ Register scratch = x10;
+ {
+ FrameScope scope(masm, StackFrame::INTERNAL);
+
+ // Load padding words on stack.
+ __ Mov(scratch, Smi::FromInt(LiveEdit::kFramePaddingValue));
+ __ PushMultipleTimes(scratch, LiveEdit::kFramePaddingInitialSize);
+ __ Mov(scratch, Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
+ __ Push(scratch);
+
+ if (mode == SAVE_RESULT_REGISTER) __ Push(x0);
+
+ __ Mov(x0, 0); // No arguments.
+ __ Mov(x1, ExternalReference(Runtime::FunctionForId(Runtime::kDebugBreak),
+ masm->isolate()));
+
+ CEntryStub stub(masm->isolate(), 1);
+ __ CallStub(&stub);
+
+ if (FLAG_debug_code) {
+ for (int i = 0; i < kNumJSCallerSaved; i++) {
+ Register reg = Register::XRegFromCode(JSCallerSavedCode(i));
+ __ Mov(reg, Operand(kDebugZapValue));
+ }
+ }
+
+ // Restore the register values from the expression stack.
+ if (mode == SAVE_RESULT_REGISTER) __ Pop(x0);
+
+ // 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(scratch, after_break_target);
+ __ Ldr(scratch, MemOperand(scratch));
+ __ Br(scratch);
+}
+
+
+void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
+ // We do not know our frame height, but set sp based on fp.
+ __ Sub(masm->StackPointer(), fp, kPointerSize);
+ __ AssertStackConsistency();
+
+ __ Pop(x1, fp, lr); // Function, Frame, Return address.
+
+ ParameterCount dummy(0);
+ __ FloodFunctionIfStepping(x1, no_reg, dummy, dummy);
+
+ UseScratchRegisterScope temps(masm);
+ Register scratch = temps.AcquireX();
+
+ // Load context from the function.
+ __ Ldr(cp, FieldMemOperand(x1, JSFunction::kContextOffset));
+
+ // Clear new.target as a safety measure.
+ __ LoadRoot(x3, Heap::kUndefinedValueRootIndex);
+
+ // Get function code.
+ __ Ldr(scratch, FieldMemOperand(x1, JSFunction::kSharedFunctionInfoOffset));
+ __ Ldr(scratch, FieldMemOperand(scratch, SharedFunctionInfo::kCodeOffset));
+ __ Add(scratch, scratch, Code::kHeaderSize - kHeapObjectTag);
+
+ // Re-run JSFunction, x1 is function, cp is context.
+ __ Br(scratch);
+}
+
+
+const bool LiveEdit::kFrameDropperSupported = true;
+
+} // namespace internal
+} // namespace v8
+
+#endif // V8_TARGET_ARCH_ARM64