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// 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
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