Move backend specific files to separate directories.

src/ia32/debug-ia32.cc

+// 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 {
+
+#ifdef ENABLE_DEBUGGER_SUPPORT
+
+// A debug break in the frame exit code is identified by a call instruction.
+bool BreakLocationIterator::IsDebugBreakAtReturn() {
+  // Opcode E8 is call.
+  return Debug::IsDebugBreakAtReturn(rinfo());
+}
+
+
+// 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);
+}
+
+
+// Check whether the JS frame exit code has been patched with a debug break.
+bool Debug::IsDebugBreakAtReturn(RelocInfo* rinfo) {
+  ASSERT(RelocInfo::IsJSReturn(rinfo->rmode()));
+  // Opcode E8 is call.
+  return (*(rinfo->pc()) == 0xE8);
+}
+
+
+#define __ ACCESS_MASM(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 __
+
+#endif  // ENABLE_DEBUGGER_SUPPORT
+
+} }  // namespace v8::internal