| // Copyright 2014 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/frame-states.h" |
| #include "src/compiler/js-context-relaxation.h" |
| #include "src/compiler/js-operator.h" |
| #include "src/compiler/node.h" |
| #include "src/compiler/node-properties.h" |
| |
| namespace v8 { |
| namespace internal { |
| namespace compiler { |
| |
| Reduction JSContextRelaxation::Reduce(Node* node) { |
| switch (node->opcode()) { |
| case IrOpcode::kJSCallFunction: |
| case IrOpcode::kJSToNumber: { |
| Node* frame_state = NodeProperties::GetFrameStateInput(node, 0); |
| Node* outer_frame = frame_state; |
| Node* original_context = NodeProperties::GetContextInput(node); |
| Node* candidate_new_context = original_context; |
| do { |
| FrameStateInfo frame_state_info( |
| OpParameter<FrameStateInfo>(outer_frame->op())); |
| const FrameStateFunctionInfo* function_info = |
| frame_state_info.function_info(); |
| if (function_info == nullptr || |
| (function_info->context_calling_mode() == |
| CALL_CHANGES_NATIVE_CONTEXT)) { |
| break; |
| } |
| candidate_new_context = outer_frame->InputAt(kFrameStateContextInput); |
| outer_frame = outer_frame->InputAt(kFrameStateOuterStateInput); |
| } while (outer_frame->opcode() == IrOpcode::kFrameState); |
| |
| while (true) { |
| switch (candidate_new_context->opcode()) { |
| case IrOpcode::kParameter: |
| case IrOpcode::kJSCreateModuleContext: |
| case IrOpcode::kJSCreateScriptContext: |
| if (candidate_new_context != original_context) { |
| NodeProperties::ReplaceContextInput(node, candidate_new_context); |
| return Changed(node); |
| } else { |
| return NoChange(); |
| } |
| case IrOpcode::kJSCreateCatchContext: |
| case IrOpcode::kJSCreateWithContext: |
| case IrOpcode::kJSCreateBlockContext: |
| candidate_new_context = |
| NodeProperties::GetContextInput(candidate_new_context); |
| break; |
| default: |
| return NoChange(); |
| } |
| } |
| } |
| default: |
| break; |
| } |
| return NoChange(); |
| } |
| |
| } // namespace compiler |
| } // namespace internal |
| } // namespace v8 |