[Interpreter] Add option to trace bytecode execution.

src/compiler/interpreter-assembler.cc

 // Copyright 2015 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/compiler/interpreter-assembler.h"
 
 #include <ostream>
 
 #include "src/code-factory.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/instruction-selector.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/pipeline.h"
 #include "src/compiler/raw-machine-assembler.h"
 #include "src/compiler/schedule.h"
 #include "src/frames.h"
 #include "src/interface-descriptors.h"
 #include "src/interpreter/bytecodes.h"
 #include "src/machine-type.h"
 #include "src/macro-assembler.h"
 #include "src/zone.h"
 
 namespace v8 {
 namespace internal {
 namespace compiler {
 
-
 InterpreterAssembler::InterpreterAssembler(Isolate* isolate, Zone* zone,
                                            interpreter::Bytecode bytecode)
     : bytecode_(bytecode),
       raw_assembler_(new RawMachineAssembler(
           isolate, new (zone) Graph(zone),
           Linkage::GetInterpreterDispatchDescriptor(zone),
           MachineType::PointerRepresentation(),
           InstructionSelector::SupportedMachineOperatorFlags())),
       accumulator_(
           raw_assembler_->Parameter(Linkage::kInterpreterAccumulatorParameter)),
       bytecode_offset_(raw_assembler_->Parameter(
           Linkage::kInterpreterBytecodeOffsetParameter)),
       context_(
           raw_assembler_->Parameter(Linkage::kInterpreterContextParameter)),
-      code_generated_(false) {}
-
+      code_generated_(false) {
+  if (FLAG_trace_ignition) {
+    TraceBytecode(Runtime::kInterpreterTraceBytecodeEntry);
+  }
+}
 
 InterpreterAssembler::~InterpreterAssembler() {}
 
 
 Handle<Code> InterpreterAssembler::GenerateCode() {
   DCHECK(!code_generated_);
 
   // Disallow empty handlers that never return.
   DCHECK_NE(0, graph()->end()->InputCount());
 
@@ skipping 408 matching lines @@
   return CallN(descriptor, code_target, args);
 }
 
 
 void InterpreterAssembler::CallPrologue() {
   StoreRegister(SmiTag(bytecode_offset_),
                 InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer);
 }
 
 
-void InterpreterAssembler::CallEpilogue() {
-  // Restore the bytecode offset from the stack frame.
-  bytecode_offset_ = SmiUntag(LoadRegister(
-      InterpreterFrameConstants::kBytecodeOffsetFromRegisterPointer));
-}
-
-
 Node* InterpreterAssembler::CallN(CallDescriptor* descriptor, Node* code_target,
                                   Node** args) {
   CallPrologue();
 
   Node* stack_pointer_before_call = nullptr;
   if (FLAG_debug_code) {
     stack_pointer_before_call = raw_assembler_->LoadStackPointer();
   }
   Node* return_val = raw_assembler_->CallN(descriptor, code_target, args);
   if (FLAG_debug_code) {
     Node* stack_pointer_after_call = raw_assembler_->LoadStackPointer();
     AbortIfWordNotEqual(stack_pointer_before_call, stack_pointer_after_call,
                         kUnexpectedStackPointer);
   }
 
-  CallEpilogue();
   return return_val;
 }
 
 
 Node* InterpreterAssembler::CallJS(Node* function, Node* first_arg,
                                    Node* arg_count) {
   Callable callable = CodeFactory::InterpreterPushArgsAndCall(isolate());
   CallDescriptor* descriptor = Linkage::GetStubCallDescriptor(
       isolate(), zone(), callable.descriptor(), 0, CallDescriptor::kNoFlags);
 
@@ skipping 82 matching lines @@
 
   return CallN(descriptor, code_target, args);
 }
 
 
 Node* InterpreterAssembler::CallRuntime(Runtime::FunctionId function_id,
                                         Node* arg1) {
   CallPrologue();
   Node* return_val =
       raw_assembler_->CallRuntime1(function_id, arg1, GetContext());
-  CallEpilogue();
   return return_val;
 }
 
 
 Node* InterpreterAssembler::CallRuntime(Runtime::FunctionId function_id,
                                         Node* arg1, Node* arg2) {
   CallPrologue();
   Node* return_val =
       raw_assembler_->CallRuntime2(function_id, arg1, arg2, GetContext());
-  CallEpilogue();
   return return_val;
 }
 
+Node* InterpreterAssembler::CallRuntime(Runtime::FunctionId function_id,
+                                        Node* arg1, Node* arg2, Node* arg3) {
+  CallPrologue();
+  Node* return_val =
+      raw_assembler_->CallRuntime3(function_id, arg1, arg2, arg3, GetContext());
+  return return_val;
+}
 
 Node* InterpreterAssembler::CallRuntime(Runtime::FunctionId function_id,
                                         Node* arg1, Node* arg2, Node* arg3,
                                         Node* arg4) {
   CallPrologue();
   Node* return_val = raw_assembler_->CallRuntime4(function_id, arg1, arg2, arg3,
                                                   arg4, GetContext());
-  CallEpilogue();
   return return_val;
 }
 
 
 void InterpreterAssembler::Return() {
+  if (FLAG_trace_ignition) {
+    TraceBytecode(Runtime::kInterpreterTraceBytecodeExit);
+  }
+
   Node* exit_trampoline_code_object =
       HeapConstant(isolate()->builtins()->InterpreterExitTrampoline());
   // If the order of the parameters you need to change the call signature below.
   STATIC_ASSERT(0 == Linkage::kInterpreterAccumulatorParameter);
   STATIC_ASSERT(1 == Linkage::kInterpreterRegisterFileParameter);
   STATIC_ASSERT(2 == Linkage::kInterpreterBytecodeOffsetParameter);
   STATIC_ASSERT(3 == Linkage::kInterpreterBytecodeArrayParameter);
   STATIC_ASSERT(4 == Linkage::kInterpreterDispatchTableParameter);
   STATIC_ASSERT(5 == Linkage::kInterpreterContextParameter);
   Node* args[] = { GetAccumulator(),
                    RegisterFileRawPointer(),
                    BytecodeOffset(),
                    BytecodeArrayTaggedPointer(),
                    DispatchTableRawPointer(),
                    GetContext() };
   raw_assembler_->TailCallN(call_descriptor(), exit_trampoline_code_object,
                             args);
 }
 
 
 Node* InterpreterAssembler::Advance(int delta) {
   return IntPtrAdd(BytecodeOffset(), Int32Constant(delta));
 }
 
 
 Node* InterpreterAssembler::Advance(Node* delta) {
   return raw_assembler_->IntPtrAdd(BytecodeOffset(), delta);
 }
 
-
 void InterpreterAssembler::Jump(Node* delta) { DispatchTo(Advance(delta)); }
 
-
 void InterpreterAssembler::JumpIfWordEqual(Node* lhs, Node* rhs, Node* delta) {
   RawMachineLabel match, no_match;
   Node* condition = raw_assembler_->WordEqual(lhs, rhs);
   raw_assembler_->Branch(condition, &match, &no_match);
   raw_assembler_->Bind(&match);
   DispatchTo(Advance(delta));
   raw_assembler_->Bind(&no_match);
   Dispatch();
 }
 
 
 void InterpreterAssembler::Dispatch() {
   DispatchTo(Advance(interpreter::Bytecodes::Size(bytecode_)));
 }
 
 
 void InterpreterAssembler::DispatchTo(Node* new_bytecode_offset) {
+  if (FLAG_trace_ignition) {
+    TraceBytecode(Runtime::kInterpreterTraceBytecodeExit);
+  }
   Node* target_bytecode = raw_assembler_->Load(
       MachineType::Uint8(), BytecodeArrayTaggedPointer(), new_bytecode_offset);
 
   // TODO(rmcilroy): Create a code target dispatch table to avoid conversion
   // from code object on every dispatch.
   Node* target_code_object = raw_assembler_->Load(
       MachineType::Pointer(), DispatchTableRawPointer(),
       raw_assembler_->Word32Shl(target_bytecode,
                                 Int32Constant(kPointerSizeLog2)));
 
@@ skipping 25 matching lines @@
 void InterpreterAssembler::AbortIfWordNotEqual(Node* lhs, Node* rhs,
                                                BailoutReason bailout_reason) {
   RawMachineLabel match, no_match;
   Node* condition = raw_assembler_->WordEqual(lhs, rhs);
   raw_assembler_->Branch(condition, &match, &no_match);
   raw_assembler_->Bind(&no_match);
   Abort(bailout_reason);
   raw_assembler_->Bind(&match);
 }
 
+void InterpreterAssembler::TraceBytecode(Runtime::FunctionId function_id) {
+  CallRuntime(function_id, BytecodeArrayTaggedPointer(),
+              SmiTag(BytecodeOffset()), GetAccumulator());
+}
 
 // static
 bool InterpreterAssembler::TargetSupportsUnalignedAccess() {
 #if V8_TARGET_ARCH_MIPS || V8_TARGET_ARCH_MIPS64
   return false;
 #elif V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_PPC
   return CpuFeatures::IsSupported(UNALIGNED_ACCESSES);
 #elif V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64 || V8_TARGET_ARCH_X87
   return true;
 #else
@@ skipping 13 matching lines @@
   return raw_assembler_->call_descriptor();
 }
 
 
 Zone* InterpreterAssembler::zone() { return raw_assembler_->zone(); }
 
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8