}
-HGraphBuilder::LoopBuilder::LoopBuilder(HGraphBuilder* builder,
- HValue* context,
- LoopBuilder::Direction direction)
- : builder_(builder),
- context_(context),
- direction_(direction),
- finished_(false) {
- header_block_ = builder->CreateLoopHeaderBlock();
- body_block_ = NULL;
- exit_block_ = NULL;
- exit_trampoline_block_ = NULL;
- increment_amount_ = builder_->graph()->GetConstant1();
+HGraphBuilder::LoopBuilder::LoopBuilder(HGraphBuilder* builder) {
+ Initialize(builder, NULL, kWhileTrue, NULL);
}
-HGraphBuilder::LoopBuilder::LoopBuilder(HGraphBuilder* builder,
- HValue* context,
+HGraphBuilder::LoopBuilder::LoopBuilder(HGraphBuilder* builder, HValue* context,
+ LoopBuilder::Direction direction) {
+ Initialize(builder, context, direction, builder->graph()->GetConstant1());
+}
+
+
+HGraphBuilder::LoopBuilder::LoopBuilder(HGraphBuilder* builder, HValue* context,
LoopBuilder::Direction direction,
- HValue* increment_amount)
- : builder_(builder),
- context_(context),
- direction_(direction),
- finished_(false) {
+ HValue* increment_amount) {
+ Initialize(builder, context, direction, increment_amount);
+ increment_amount_ = increment_amount;
+}
+
+
+void HGraphBuilder::LoopBuilder::Initialize(HGraphBuilder* builder,
+ HValue* context,
+ Direction direction,
+ HValue* increment_amount) {
+ builder_ = builder;
+ context_ = context;
+ direction_ = direction;
+ increment_amount_ = increment_amount;
+
+ finished_ = false;
header_block_ = builder->CreateLoopHeaderBlock();
body_block_ = NULL;
exit_block_ = NULL;
exit_trampoline_block_ = NULL;
- increment_amount_ = increment_amount;
}
HValue* initial,
HValue* terminating,
Token::Value token) {
+ ASSERT(direction_ != kWhileTrue);
HEnvironment* env = builder_->environment();
phi_ = header_block_->AddNewPhi(env->values()->length());
phi_->AddInput(initial);
}
+void HGraphBuilder::LoopBuilder::BeginBody(int drop_count) {
+ ASSERT(direction_ == kWhileTrue);
+ HEnvironment* env = builder_->environment();
+ builder_->GotoNoSimulate(header_block_);
+ builder_->set_current_block(header_block_);
+ env->Drop(drop_count);
+}
+
+
void HGraphBuilder::LoopBuilder::Break() {
if (exit_trampoline_block_ == NULL) {
// Its the first time we saw a break.
- HEnvironment* env = exit_block_->last_environment()->Copy();
- exit_trampoline_block_ = builder_->CreateBasicBlock(env);
- builder_->GotoNoSimulate(exit_block_, exit_trampoline_block_);
+ if (direction_ == kWhileTrue) {
+ HEnvironment* env = builder_->environment()->Copy();
+ exit_trampoline_block_ = builder_->CreateBasicBlock(env);
+ } else {
+ HEnvironment* env = exit_block_->last_environment()->Copy();
+ exit_trampoline_block_ = builder_->CreateBasicBlock(env);
+ builder_->GotoNoSimulate(exit_block_, exit_trampoline_block_);
+ }
}
builder_->GotoNoSimulate(exit_trampoline_block_);
builder_->AddInstruction(increment_);
}
- // Push the new increment value on the expression stack to merge into the phi.
- builder_->environment()->Push(increment_);
+ if (direction_ != kWhileTrue) {
+ // Push the new increment value on the expression stack to merge into
+ // the phi.
+ builder_->environment()->Push(increment_);
+ }
HBasicBlock* last_block = builder_->current_block();
builder_->GotoNoSimulate(last_block, header_block_);
header_block_->loop_information()->RegisterBackEdge(last_block);