| Ben Murdoch | 4a90d5f | 2016-03-22 12:00:34 +0000 | [diff] [blame] | 1 | // Copyright 2014 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "src/compiler/frame-states.h" |
| 6 | #include "src/compiler/js-context-relaxation.h" |
| 7 | #include "src/compiler/js-operator.h" |
| 8 | #include "src/compiler/node.h" |
| 9 | #include "src/compiler/node-properties.h" |
| 10 | |
| 11 | namespace v8 { |
| 12 | namespace internal { |
| 13 | namespace compiler { |
| 14 | |
| 15 | Reduction JSContextRelaxation::Reduce(Node* node) { |
| 16 | switch (node->opcode()) { |
| 17 | case IrOpcode::kJSCallFunction: |
| 18 | case IrOpcode::kJSToNumber: { |
| 19 | Node* frame_state = NodeProperties::GetFrameStateInput(node, 0); |
| 20 | Node* outer_frame = frame_state; |
| 21 | Node* original_context = NodeProperties::GetContextInput(node); |
| 22 | Node* candidate_new_context = original_context; |
| 23 | do { |
| 24 | FrameStateInfo frame_state_info( |
| 25 | OpParameter<FrameStateInfo>(outer_frame->op())); |
| 26 | const FrameStateFunctionInfo* function_info = |
| 27 | frame_state_info.function_info(); |
| 28 | if (function_info == nullptr || |
| 29 | (function_info->context_calling_mode() == |
| 30 | CALL_CHANGES_NATIVE_CONTEXT)) { |
| 31 | break; |
| 32 | } |
| 33 | candidate_new_context = outer_frame->InputAt(kFrameStateContextInput); |
| 34 | outer_frame = outer_frame->InputAt(kFrameStateOuterStateInput); |
| 35 | } while (outer_frame->opcode() == IrOpcode::kFrameState); |
| 36 | |
| 37 | while (true) { |
| 38 | switch (candidate_new_context->opcode()) { |
| 39 | case IrOpcode::kParameter: |
| 40 | case IrOpcode::kJSCreateModuleContext: |
| 41 | case IrOpcode::kJSCreateScriptContext: |
| 42 | if (candidate_new_context != original_context) { |
| 43 | NodeProperties::ReplaceContextInput(node, candidate_new_context); |
| 44 | return Changed(node); |
| 45 | } else { |
| 46 | return NoChange(); |
| 47 | } |
| 48 | case IrOpcode::kJSCreateCatchContext: |
| 49 | case IrOpcode::kJSCreateWithContext: |
| 50 | case IrOpcode::kJSCreateBlockContext: |
| 51 | candidate_new_context = |
| 52 | NodeProperties::GetContextInput(candidate_new_context); |
| 53 | break; |
| 54 | default: |
| 55 | return NoChange(); |
| 56 | } |
| 57 | } |
| 58 | } |
| 59 | default: |
| 60 | break; |
| 61 | } |
| 62 | return NoChange(); |
| 63 | } |
| 64 | |
| 65 | } // namespace compiler |
| 66 | } // namespace internal |
| 67 | } // namespace v8 |