| // Copyright 2006-2008 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" |
| |
| #include "codegen-inl.h" |
| #include "debug.h" |
| |
| |
| namespace v8 { namespace internal { |
| |
| |
| // A debug break in the frame exit code is identified by a call instruction. |
| bool BreakLocationIterator::IsDebugBreakAtReturn() { |
| // Opcode E8 is call. |
| return (*(rinfo()->pc()) == 0xE8); |
| } |
| |
| |
| // Patch the JS frame exit code with a debug break call. See |
| // CodeGenerator::VisitReturnStatement and VirtualFrame::Exit in codegen-ia32.cc |
| // for the precise return instructions sequence. |
| void BreakLocationIterator::SetDebugBreakAtReturn() { |
| ASSERT(Debug::kIa32JSReturnSequenceLength >= |
| Debug::kIa32CallInstructionLength); |
| rinfo()->PatchCodeWithCall(Debug::debug_break_return_entry()->entry(), |
| Debug::kIa32JSReturnSequenceLength - Debug::kIa32CallInstructionLength); |
| } |
| |
| |
| // Restore the JS frame exit code. |
| void BreakLocationIterator::ClearDebugBreakAtReturn() { |
| rinfo()->PatchCode(original_rinfo()->pc(), |
| Debug::kIa32JSReturnSequenceLength); |
| } |
| |
| |
| #define __ masm-> |
| |
| |
| static void Generate_DebugBreakCallHelper(MacroAssembler* masm, |
| RegList pointer_regs, |
| bool convert_call_to_jmp) { |
| // Save the content of all general purpose registers in memory. This copy in |
| // memory is later pushed onto the JS expression stack for the fake JS frame |
| // generated and also to the C frame generated on top of that. In the JS |
| // frame ONLY the registers containing pointers will be pushed on the |
| // expression stack. This causes the GC to update these pointers so that |
| // they will have the correct value when returning from the debugger. |
| __ SaveRegistersToMemory(kJSCallerSaved); |
| |
| // Enter an internal frame. |
| __ EnterInternalFrame(); |
| |
| // Store the registers containing object pointers on the expression stack to |
| // make sure that these are correctly updated during GC. |
| __ PushRegistersFromMemory(pointer_regs); |
| |
| #ifdef DEBUG |
| __ RecordComment("// Calling from debug break to runtime - come in - over"); |
| #endif |
| __ Set(eax, Immediate(0)); // no arguments |
| __ mov(ebx, Immediate(ExternalReference::debug_break())); |
| |
| CEntryDebugBreakStub ceb; |
| __ CallStub(&ceb); |
| |
| // Restore the register values containing object pointers from the expression |
| // stack in the reverse order as they where pushed. |
| __ PopRegistersToMemory(pointer_regs); |
| |
| // Get rid of the internal frame. |
| __ LeaveInternalFrame(); |
| |
| // 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) { |
| __ pop(eax); |
| } |
| |
| // Finally restore all registers. |
| __ RestoreRegistersFromMemory(kJSCallerSaved); |
| |
| // 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()); |
| __ jmp(Operand::StaticVariable(after_break_target)); |
| } |
| |
| |
| void Debug::GenerateLoadICDebugBreak(MacroAssembler* masm) { |
| // Register state for IC load call (from ic-ia32.cc). |
| // ----------- S t a t e ------------- |
| // -- ecx : name |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, ecx.bit(), false); |
| } |
| |
| |
| void Debug::GenerateStoreICDebugBreak(MacroAssembler* masm) { |
| // REgister state for IC store call (from ic-ia32.cc). |
| // ----------- S t a t e ------------- |
| // -- eax : value |
| // -- ecx : name |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, eax.bit() | ecx.bit(), false); |
| } |
| |
| |
| void Debug::GenerateKeyedLoadICDebugBreak(MacroAssembler* masm) { |
| // Register state for keyed IC load call (from ic-ia32.cc). |
| // ----------- S t a t e ------------- |
| // No registers used on entry. |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, 0, false); |
| } |
| |
| |
| void Debug::GenerateKeyedStoreICDebugBreak(MacroAssembler* masm) { |
| // Register state for keyed IC load call (from ic-ia32.cc). |
| // ----------- S t a t e ------------- |
| // -- eax : value |
| // ----------------------------------- |
| // Register eax contains an object that needs to be pushed on the |
| // expression stack of the fake JS frame. |
| Generate_DebugBreakCallHelper(masm, eax.bit(), false); |
| } |
| |
| |
| void Debug::GenerateCallICDebugBreak(MacroAssembler* masm) { |
| // Register state for keyed IC call call (from ic-ia32.cc) |
| // ----------- S t a t e ------------- |
| // -- eax: number of arguments |
| // ----------------------------------- |
| // The number of arguments in eax is not smi encoded. |
| Generate_DebugBreakCallHelper(masm, 0, false); |
| } |
| |
| |
| void Debug::GenerateConstructCallDebugBreak(MacroAssembler* masm) { |
| // Register state just before return from JS function (from codegen-ia32.cc). |
| // eax is the actual number of arguments not encoded as a smi see comment |
| // above IC call. |
| // ----------- S t a t e ------------- |
| // -- eax: number of arguments |
| // ----------------------------------- |
| // The number of arguments in eax is not smi encoded. |
| Generate_DebugBreakCallHelper(masm, 0, false); |
| } |
| |
| |
| void Debug::GenerateReturnDebugBreak(MacroAssembler* masm) { |
| // Register state just before return from JS function (from codegen-ia32.cc). |
| // ----------- S t a t e ------------- |
| // -- eax: return value |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, eax.bit(), true); |
| } |
| |
| |
| void Debug::GenerateReturnDebugBreakEntry(MacroAssembler* masm) { |
| // OK to clobber ebx as we are returning from a JS function in the code |
| // generated by Ia32CodeGenerator::ExitJSFrame. |
| ExternalReference debug_break_return = |
| ExternalReference(Debug_Address::DebugBreakReturn()); |
| __ mov(ebx, Operand::StaticVariable(debug_break_return)); |
| __ add(Operand(ebx), Immediate(Code::kHeaderSize - kHeapObjectTag)); |
| __ jmp(Operand(ebx)); |
| } |
| |
| |
| void Debug::GenerateStubNoRegistersDebugBreak(MacroAssembler* masm) { |
| // Register state for stub CallFunction (from CallFunctionStub in ic-ia32.cc). |
| // ----------- S t a t e ------------- |
| // No registers used on entry. |
| // ----------------------------------- |
| Generate_DebugBreakCallHelper(masm, 0, false); |
| } |
| |
| |
| #undef __ |
| |
| |
| } } // namespace v8::internal |