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// 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/interpreter/control-flow-builders.h"
namespace v8 {
namespace internal {
namespace interpreter {
BreakableControlFlowBuilder::~BreakableControlFlowBuilder() {
DCHECK(break_labels_.empty() || break_labels_.is_bound());
}
void BreakableControlFlowBuilder::BindBreakTarget() {
break_labels_.Bind(builder());
}
void BreakableControlFlowBuilder::EmitJump(BytecodeLabels* sites) {
builder()->Jump(sites->New());
}
void BreakableControlFlowBuilder::EmitJumpIfTrue(BytecodeLabels* sites) {
builder()->JumpIfTrue(sites->New());
}
void BreakableControlFlowBuilder::EmitJumpIfFalse(BytecodeLabels* sites) {
builder()->JumpIfFalse(sites->New());
}
void BreakableControlFlowBuilder::EmitJumpIfUndefined(BytecodeLabels* sites) {
builder()->JumpIfUndefined(sites->New());
}
void BreakableControlFlowBuilder::EmitJumpIfNull(BytecodeLabels* sites) {
builder()->JumpIfNull(sites->New());
}
void BlockBuilder::EndBlock() {
builder()->Bind(&block_end_);
BindBreakTarget();
}
LoopBuilder::~LoopBuilder() {
DCHECK(continue_labels_.empty() || continue_labels_.is_bound());
DCHECK(header_labels_.empty() || header_labels_.is_bound());
}
void LoopBuilder::LoopHeader(ZoneVector<BytecodeLabel>* additional_labels) {
// Jumps from before the loop header into the loop violate ordering
// requirements of bytecode basic blocks. The only entry into a loop
// must be the loop header. Surely breaks is okay? Not if nested
// and misplaced between the headers.
DCHECK(break_labels_.empty() && continue_labels_.empty());
builder()->Bind(&loop_header_);
for (auto& label : *additional_labels) {
builder()->Bind(&label);
}
}
void LoopBuilder::JumpToHeader(int loop_depth) {
// Pass the proper loop nesting level to the backwards branch, to trigger
// on-stack replacement when armed for the given loop nesting depth.
int level = Min(loop_depth, AbstractCode::kMaxLoopNestingMarker - 1);
// Loop must have closed form, i.e. all loop elements are within the loop,
// the loop header precedes the body and next elements in the loop.
DCHECK(loop_header_.is_bound());
builder()->JumpLoop(&loop_header_, level);
}
void LoopBuilder::EndLoop() {
BindBreakTarget();
header_labels_.BindToLabel(builder(), loop_header_);
}
void LoopBuilder::BindContinueTarget() { continue_labels_.Bind(builder()); }
SwitchBuilder::~SwitchBuilder() {
#ifdef DEBUG
for (auto site : case_sites_) {
DCHECK(site.is_bound());
}
#endif
}
void SwitchBuilder::SetCaseTarget(int index) {
BytecodeLabel& site = case_sites_.at(index);
builder()->Bind(&site);
}
void TryCatchBuilder::BeginTry(Register context) {
builder()->MarkTryBegin(handler_id_, context);
}
void TryCatchBuilder::EndTry() {
builder()->MarkTryEnd(handler_id_);
builder()->Jump(&exit_);
builder()->Bind(&handler_);
builder()->MarkHandler(handler_id_, catch_prediction_);
}
void TryCatchBuilder::EndCatch() { builder()->Bind(&exit_); }
void TryFinallyBuilder::BeginTry(Register context) {
builder()->MarkTryBegin(handler_id_, context);
}
void TryFinallyBuilder::LeaveTry() {
builder()->Jump(finalization_sites_.New());
}
void TryFinallyBuilder::EndTry() {
builder()->MarkTryEnd(handler_id_);
}
void TryFinallyBuilder::BeginHandler() {
builder()->Bind(&handler_);
builder()->MarkHandler(handler_id_, catch_prediction_);
}
void TryFinallyBuilder::BeginFinally() { finalization_sites_.Bind(builder()); }
void TryFinallyBuilder::EndFinally() {
// Nothing to be done here.
}
} // namespace interpreter
} // namespace internal
} // namespace v8
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