deps: upgrade V8 to 4.6.85.23

PR-URL: https://github.com/nodejs/node/pull/3351
Reviewed-By: indutny - Fedor Indutny <fedor.indutny@gmail.com>
Reviewed-By: bnoordhuis - Ben Noordhuis <info@bnoordhuis.nl>

1 files changed, 146 insertions, 0 deletions

diff --git a/deps/v8/src/debug/x64/debug-x64.cc b/deps/v8/src/debug/x64/debug-x64.cc
new file mode 100644
index 0000000000..3b65678709
--- /dev/null
+++ b/deps/v8/src/debug/x64/debug-x64.cc
@@ -0,0 +1,146 @@
+// 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_X64
+
+#include "src/assembler.h"
+#include "src/codegen.h"
+#include "src/debug/debug.h"
+
+
+namespace v8 {
+namespace internal {
+
+#define __ ACCESS_MASM(masm)
+
+
+void EmitDebugBreakSlot(MacroAssembler* masm) {
+  Label check_codesize;
+  __ bind(&check_codesize);
+  __ Nop(Assembler::kDebugBreakSlotLength);
+  DCHECK_EQ(Assembler::kDebugBreakSlotLength,
+            masm->SizeOfCodeGeneratedSince(&check_codesize));
+}
+
+
+void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode,
+                                int call_argc) {
+  // Generate enough nop's to make space for a call instruction.
+  masm->RecordDebugBreakSlot(mode, call_argc);
+  EmitDebugBreakSlot(masm);
+}
+
+
+void DebugCodegen::ClearDebugBreakSlot(Address pc) {
+  CodePatcher patcher(pc, Assembler::kDebugBreakSlotLength);
+  EmitDebugBreakSlot(patcher.masm());
+}
+
+
+void DebugCodegen::PatchDebugBreakSlot(Address pc, Handle<Code> code) {
+  DCHECK_EQ(Code::BUILTIN, code->kind());
+  static const int kSize = Assembler::kDebugBreakSlotLength;
+  CodePatcher patcher(pc, kSize);
+  Label check_codesize;
+  patcher.masm()->bind(&check_codesize);
+  patcher.masm()->movp(kScratchRegister, reinterpret_cast<void*>(code->entry()),
+                       Assembler::RelocInfoNone());
+  patcher.masm()->call(kScratchRegister);
+  // Check that the size of the code generated is as expected.
+  DCHECK_EQ(kSize, patcher.masm()->SizeOfCodeGeneratedSince(&check_codesize));
+}
+
+
+void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
+                                          DebugBreakCallHelperMode mode) {
+  __ RecordComment("Debug break");
+
+  // Enter an internal frame.
+  {
+    FrameScope scope(masm, StackFrame::INTERNAL);
+
+    // Load padding words on stack.
+    for (int i = 0; i < LiveEdit::kFramePaddingInitialSize; i++) {
+      __ Push(Smi::FromInt(LiveEdit::kFramePaddingValue));
+    }
+    __ Push(Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
+
+    if (mode == SAVE_RESULT_REGISTER) __ Push(rax);
+
+    __ Set(rax, 0);  // No arguments (argc == 0).
+    __ Move(rbx, 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)};
+        __ Set(reg, kDebugZapValue);
+      }
+    }
+
+    if (mode == SAVE_RESULT_REGISTER) __ Pop(rax);
+
+    // Read current padding counter and skip corresponding number of words.
+    __ Pop(kScratchRegister);
+    __ SmiToInteger32(kScratchRegister, kScratchRegister);
+    __ leap(rsp, Operand(rsp, kScratchRegister, times_pointer_size, 0));
+
+    // Get rid of the internal frame.
+  }
+
+  // This call did not replace a call , so there will be an unwanted
+  // return address left on the stack. Here we get rid of that.
+  __ addp(rsp, Immediate(kPCOnStackSize));
+
+  // 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());
+  __ Move(kScratchRegister, after_break_target);
+  __ Jump(Operand(kScratchRegister, 0));
+}
+
+
+void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
+  masm->ret(0);
+}
+
+
+void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
+  ExternalReference restarter_frame_function_slot =
+      ExternalReference::debug_restarter_frame_function_pointer_address(
+          masm->isolate());
+  __ Move(rax, restarter_frame_function_slot);
+  __ movp(Operand(rax, 0), Immediate(0));
+
+  // We do not know our frame height, but set rsp based on rbp.
+  __ leap(rsp, Operand(rbp, -1 * kPointerSize));
+
+  __ Pop(rdi);  // Function.
+  __ popq(rbp);
+
+  // Load context from the function.
+  __ movp(rsi, FieldOperand(rdi, JSFunction::kContextOffset));
+
+  // Get function code.
+  __ movp(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset));
+  __ movp(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset));
+  __ leap(rdx, FieldOperand(rdx, Code::kHeaderSize));
+
+  // Re-run JSFunction, rdi is function, rsi is context.
+  __ jmp(rdx);
+}
+
+const bool LiveEdit::kFrameDropperSupported = true;
+
+#undef __
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_TARGET_ARCH_X64