Debugger: move implementation to a separate folder.

src/mips64/debug-mips64.cc

-// 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.
-
-
-
-#include "src/v8.h"
-
-#if V8_TARGET_ARCH_MIPS64
-
-#include "src/codegen.h"
-#include "src/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,
-                                int call_argc) {
-  // Generate enough nop's to make space for a call instruction. Avoid emitting
-  // the trampoline pool in the debug break slot code.
-  Assembler::BlockTrampolinePoolScope block_pool(masm);
-  masm->RecordDebugBreakSlot(mode, call_argc);
-  EmitDebugBreakSlot(masm);
-}
-
-
-void DebugCodegen::ClearDebugBreakSlot(Address pc) {
-  CodePatcher patcher(pc, Assembler::kDebugBreakSlotInstructions);
-  EmitDebugBreakSlot(patcher.masm());
-}
-
-
-void DebugCodegen::PatchDebugBreakSlot(Address pc, Handle<Code> code) {
-  DCHECK_EQ(Code::BUILTIN, code->kind());
-  CodePatcher patcher(pc, Assembler::kDebugBreakSlotInstructions);
-  // Patch the code changing the debug break slot code from:
-  //   nop(DEBUG_BREAK_NOP) - nop(1) is sll(zero_reg, zero_reg, 1)
-  //   nop(DEBUG_BREAK_NOP)
-  //   nop(DEBUG_BREAK_NOP)
-  //   nop(DEBUG_BREAK_NOP)
-  //   nop(DEBUG_BREAK_NOP)
-  //   nop(DEBUG_BREAK_NOP)
-  // to a call to the debug break slot code.
-  //   li t9, address   (4-instruction sequence on mips64)
-  //   call t9          (jalr t9 / nop instruction pair)
-  patcher.masm()->li(v8::internal::t9,
-                     Operand(reinterpret_cast<int64_t>(code->entry())),
-                     ADDRESS_LOAD);
-  patcher.masm()->Call(v8::internal::t9);
-}
-
-
-void DebugCodegen::GenerateDebugBreakStub(MacroAssembler* masm,
-                                          DebugBreakCallHelperMode mode) {
-  __ RecordComment("Debug break");
-  {
-    FrameScope scope(masm, StackFrame::INTERNAL);
-
-    // Load padding words on stack.
-    __ li(at, Operand(Smi::FromInt(LiveEdit::kFramePaddingValue)));
-    __ Dsubu(sp, sp,
-            Operand(kPointerSize * LiveEdit::kFramePaddingInitialSize));
-    for (int i = LiveEdit::kFramePaddingInitialSize - 1; i >= 0; i--) {
-      __ sd(at, MemOperand(sp, kPointerSize * i));
-    }
-    __ li(at, Operand(Smi::FromInt(LiveEdit::kFramePaddingInitialSize)));
-    __ push(at);
-
-    if (mode == SAVE_RESULT_REGISTER) __ push(v0);
-
-    __ PrepareCEntryArgs(0);  // No arguments.
-    __ PrepareCEntryFunction(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)};
-        __ li(reg, kDebugZapValue);
-      }
-    }
-
-    if (mode == SAVE_RESULT_REGISTER) __ pop(v0);
-
-    // 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());
-  __ li(t9, Operand(after_break_target));
-  __ ld(t9, MemOperand(t9));
-  __ Jump(t9);
-}
-
-
-void DebugCodegen::GeneratePlainReturnLiveEdit(MacroAssembler* masm) {
-  __ Ret();
-}
-
-
-void DebugCodegen::GenerateFrameDropperLiveEdit(MacroAssembler* masm) {
-  ExternalReference restarter_frame_function_slot =
-      ExternalReference::debug_restarter_frame_function_pointer_address(
-          masm->isolate());
-  __ li(at, Operand(restarter_frame_function_slot));
-  __ sw(zero_reg, MemOperand(at, 0));
-
-  // We do not know our frame height, but set sp based on fp.
-  __ Dsubu(sp, fp, Operand(kPointerSize));
-
-  __ Pop(ra, fp, a1);  // Return address, Frame, Function.
-
-  // Load context from the function.
-  __ ld(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
-
-  // Get function code.
-  __ ld(at, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-  __ ld(at, FieldMemOperand(at, SharedFunctionInfo::kCodeOffset));
-  __ Daddu(t9, at, Operand(Code::kHeaderSize - kHeapObjectTag));
-
-  // Re-run JSFunction, a1 is function, cp is context.
-  __ Jump(t9);
-}
-
-
-const bool LiveEdit::kFrameDropperSupported = true;
-
-#undef __
-
-}  // namespace internal
-}  // namespace v8
-
-#endif  // V8_TARGET_ARCH_MIPS64