| // 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 |
| // with the distribution. |
| // * Neither the name of Google Inc. nor the names of its |
| // contributors may be used to endorse or promote products derived |
| // from this software without specific prior written permission. |
| // |
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| |
| #include "v8.h" |
| |
| #if defined(V8_TARGET_ARCH_X64) |
| |
| #include "assembler.h" |
| #include "codegen.h" |
| #include "debug.h" |
| |
| |
| namespace v8 { |
| namespace internal { |
| |
| #ifdef ENABLE_DEBUGGER_SUPPORT |
| |
| bool BreakLocationIterator::IsDebugBreakAtReturn() { |
| return Debug::IsDebugBreakAtReturn(rinfo()); |
| } |
| |
| |
| // Patch the JS frame exit code with a debug break call. See |
| // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-x64.cc |
| // for the precise return instructions sequence. |
| void BreakLocationIterator::SetDebugBreakAtReturn() { |
| ASSERT(Assembler::kJSReturnSequenceLength >= |
| Assembler::kCallInstructionLength); |
| rinfo()->PatchCodeWithCall( |
| Isolate::Current()->debug()->debug_break_return()->entry(), |
| Assembler::kJSReturnSequenceLength - Assembler::kCallInstructionLength); |
| } |
| |
| |
| // Restore the JS frame exit code. |
| void BreakLocationIterator::ClearDebugBreakAtReturn() { |
| rinfo()->PatchCode(original_rinfo()->pc(), |
| Assembler::kJSReturnSequenceLength); |
| } |
| |
| |
| // A debug break in the frame exit code is identified by the JS frame exit code |
| // having been patched with a call instruction. |
| bool Debug::IsDebugBreakAtReturn(v8::internal::RelocInfo* rinfo) { |
| ASSERT(RelocInfo::IsJSReturn(rinfo->rmode())); |
| return rinfo->IsPatchedReturnSequence(); |
| } |
| |
| |
| bool BreakLocationIterator::IsDebugBreakAtSlot() { |
| ASSERT(IsDebugBreakSlot()); |
| // Check whether the debug break slot instructions have been patched. |
| return !Assembler::IsNop(rinfo()->pc()); |
| } |
| |
| |
| void BreakLocationIterator::SetDebugBreakAtSlot() { |
| ASSERT(IsDebugBreakSlot()); |
| rinfo()->PatchCodeWithCall( |
| Isolate::Current()->debug()->debug_break_slot()->entry(), |
| Assembler::kDebugBreakSlotLength - Assembler::kCallInstructionLength); |
| } |
| |
| |
| void BreakLocationIterator::ClearDebugBreakAtSlot() { |
| ASSERT(IsDebugBreakSlot()); |
| rinfo()->PatchCode(original_rinfo()->pc(), Assembler::kDebugBreakSlotLength); |
| } |
| |
| |
| #define __ ACCESS_MASM(masm) |
| |
| |
| static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
| RegList object_regs, |
| RegList non_object_regs, |
| bool convert_call_to_jmp) { |
| // Enter an internal frame. |
| { |
| FrameScope scope(masm, StackFrame::INTERNAL); |
| |
| // Store the registers containing live values on the expression stack to |
| // make sure that these are correctly updated during GC. Non object values |
| // are stored as as two smis causing it to be untouched by GC. |
| ASSERT((object_regs & ~kJSCallerSaved) == 0); |
| ASSERT((non_object_regs & ~kJSCallerSaved) == 0); |
| ASSERT((object_regs & non_object_regs) == 0); |
| for (int i = 0; i < kNumJSCallerSaved; i++) { |
| int r = JSCallerSavedCode(i); |
| Register reg = { r }; |
| ASSERT(!reg.is(kScratchRegister)); |
| if ((object_regs & (1 << r)) != 0) { |
| __ push(reg); |
| } |
| // Store the 64-bit value as two smis. |
| if ((non_object_regs & (1 << r)) != 0) { |
| __ movq(kScratchRegister, reg); |
| __ Integer32ToSmi(reg, reg); |
| __ push(reg); |
| __ sar(kScratchRegister, Immediate(32)); |
| __ Integer32ToSmi(kScratchRegister, kScratchRegister); |
| __ push(kScratchRegister); |
| } |
| } |
| |
| #ifdef DEBUG |
| __ RecordComment("// Calling from debug break to runtime - come in - over"); |
| #endif |
| __ Set(rax, 0); // No arguments (argc == 0). |
| __ movq(rbx, ExternalReference::debug_break(masm->isolate())); |
| |
| CEntryStub ceb(1); |
| __ CallStub(&ceb); |
| |
| // Restore the register values from the expression stack. |
| for (int i = kNumJSCallerSaved - 1; i >= 0; i--) { |
| int r = JSCallerSavedCode(i); |
| Register reg = { r }; |
| if (FLAG_debug_code) { |
| __ Set(reg, kDebugZapValue); |
| } |
| if ((object_regs & (1 << r)) != 0) { |
| __ pop(reg); |
| } |
| // Reconstruct the 64-bit value from two smis. |
| if ((non_object_regs & (1 << r)) != 0) { |
| __ pop(kScratchRegister); |
| __ SmiToInteger32(kScratchRegister, kScratchRegister); |
| __ shl(kScratchRegister, Immediate(32)); |
| __ pop(reg); |
| __ SmiToInteger32(reg, reg); |
| __ or_(reg, kScratchRegister); |
| } |
| } |
| |
| // Get rid of the internal frame. |
| } |
| |
| // If this call did not replace a call but patched other code then there will |
| // be an unwanted return address left on the stack. Here we get rid of that. |
| if (convert_call_to_jmp) { |
| __ addq(rsp, Immediate(kPointerSize)); |
| } |
| |
| // 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_Address::AfterBreakTarget(), masm->isolate()); |
| __ movq(kScratchRegister, after_break_target); |
| __ jmp(Operand(kScratchRegister, 0)); |
| } |
| |
| |
| void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { |
| // Register state for IC load call (from ic-x64.cc). |
| // ----------- S t a t e ------------- |
| // -- rax : receiver |
| // -- rcx : name |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, rax.bit() | rcx.bit(), 0, false); |
| } |
| |
| |
| void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { |
| // Register state for IC store call (from ic-x64.cc). |
| // ----------- S t a t e ------------- |
| // -- rax : value |
| // -- rcx : name |
| // -- rdx : receiver |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper( |
| masm, rax.bit() | rcx.bit() | rdx.bit(), 0, false); |
| } |
| |
| |
| void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { |
| // Register state for keyed IC load call (from ic-x64.cc). |
| // ----------- S t a t e ------------- |
| // -- rax : key |
| // -- rdx : receiver |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, rax.bit() | rdx.bit(), 0, false); |
| } |
| |
| |
| void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { |
| // Register state for keyed IC load call (from ic-x64.cc). |
| // ----------- S t a t e ------------- |
| // -- rax : value |
| // -- rcx : key |
| // -- rdx : receiver |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper( |
| masm, rax.bit() | rcx.bit() | rdx.bit(), 0, false); |
| } |
| |
| |
| void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { |
| // Register state for IC call call (from ic-x64.cc) |
| // ----------- S t a t e ------------- |
| // -- rcx: function name |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, rcx.bit(), 0, false); |
| } |
| |
| |
| void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) { |
| // Register state just before return from JS function (from codegen-x64.cc). |
| // rax is the actual number of arguments not encoded as a smi, see comment |
| // above IC call. |
| // ----------- S t a t e ------------- |
| // -- rax: number of arguments |
| // ----------------------------------- |
| // The number of arguments in rax is not smi encoded. |
| Generate_DebugBreakCallHelper(masm, rdi.bit(), rax.bit(), false); |
| } |
| |
| |
| void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { |
| // Register state just before return from JS function (from codegen-x64.cc). |
| // ----------- S t a t e ------------- |
| // -- rax: return value |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, rax.bit(), 0, true); |
| } |
| |
| |
| void Debug::GenerateCallFunctionStubDebugBreak(MacroAssembler* masm) { |
| // Register state for stub CallFunction (from CallFunctionStub in ic-x64.cc). |
| // ----------- S t a t e ------------- |
| // -- rdi : function |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, rdi.bit(), 0, false); |
| } |
| |
| |
| void Debug::GenerateSlot(MacroAssembler* masm) { |
| // Generate enough nop's to make space for a call instruction. |
| Label check_codesize; |
| __ bind(&check_codesize); |
| __ RecordDebugBreakSlot(); |
| __ Nop(Assembler::kDebugBreakSlotLength); |
| ASSERT_EQ(Assembler::kDebugBreakSlotLength, |
| masm->SizeOfCodeGeneratedSince(&check_codesize)); |
| } |
| |
| |
| void Debug::GenerateSlotDebugBreak(MacroAssembler* masm) { |
| // In the places where a debug break slot is inserted no registers can contain |
| // object pointers. |
| Generate_DebugBreakCallHelper(masm, 0, 0, true); |
| } |
| |
| |
| void Debug::GeneratePlainReturnLiveEdit(MacroAssembler* masm) { |
| masm->ret(0); |
| } |
| |
| |
| void Debug::GenerateFrameDropperLiveEdit(MacroAssembler* masm) { |
| ExternalReference restarter_frame_function_slot = |
| ExternalReference(Debug_Address::RestarterFrameFunctionPointer(), |
| masm->isolate()); |
| __ movq(rax, restarter_frame_function_slot); |
| __ movq(Operand(rax, 0), Immediate(0)); |
| |
| // We do not know our frame height, but set rsp based on rbp. |
| __ lea(rsp, Operand(rbp, -1 * kPointerSize)); |
| |
| __ pop(rdi); // Function. |
| __ pop(rbp); |
| |
| // Load context from the function. |
| __ movq(rsi, FieldOperand(rdi, JSFunction::kContextOffset)); |
| |
| // Get function code. |
| __ movq(rdx, FieldOperand(rdi, JSFunction::kSharedFunctionInfoOffset)); |
| __ movq(rdx, FieldOperand(rdx, SharedFunctionInfo::kCodeOffset)); |
| __ lea(rdx, FieldOperand(rdx, Code::kHeaderSize)); |
| |
| // Re-run JSFunction, rdi is function, rsi is context. |
| __ jmp(rdx); |
| } |
| |
| const bool Debug::kFrameDropperSupported = true; |
| |
| #undef __ |
| |
| #endif // ENABLE_DEBUGGER_SUPPORT |
| |
| } } // namespace v8::internal |
| |
| #endif // V8_TARGET_ARCH_X64 |