[Interpreter] Local flow control in the bytecode graph builder.

src/interpreter/control-flow-builders.cc

Index: src/interpreter/control-flow-builders.cc
diff --git a/src/interpreter/control-flow-builders.cc b/src/interpreter/control-flow-builders.cc
index 3ecabe4351cb9ddbac13618b1b85e52d29ca0cd3..fcdc5be575206bda48ac485bbc5bb46e1ea2f081 100644
--- a/src/interpreter/control-flow-builders.cc
+++ b/src/interpreter/control-flow-builders.cc
@@ -32,6 +32,13 @@ void BreakableControlFlowBuilder::EmitJumpIfTrue(
 }
 
 
+void BreakableControlFlowBuilder::EmitJumpIfFalse(
+    ZoneVector<BytecodeLabel>* sites) {
+  sites->push_back(BytecodeLabel());
+  builder()->JumpIfFalse(&sites->back());
+}
+
+
 void BreakableControlFlowBuilder::EmitJumpIfUndefined(
     ZoneVector<BytecodeLabel>* sites) {
   sites->push_back(BytecodeLabel());
@@ -58,6 +65,12 @@ void BreakableControlFlowBuilder::EmitJumpIfTrue(
 }
 
 
+void BreakableControlFlowBuilder::EmitJumpIfFalse(
+    ZoneVector<BytecodeLabel>* sites, int index) {
+  builder()->JumpIfFalse(&sites->at(index));
+}
+
+
 void BreakableControlFlowBuilder::BindLabels(const BytecodeLabel& target,
                                              ZoneVector<BytecodeLabel>* sites) {
   for (size_t i = 0; i < sites->size(); i++) {
@@ -71,6 +84,24 @@ void BreakableControlFlowBuilder::BindLabels(const BytecodeLabel& target,
 LoopBuilder::~LoopBuilder() { DCHECK(continue_sites_.empty()); }
 
 
+void LoopBuilder::LoopEnd() {
+  // Loop must have closed form, ie all loop elements are within the

[rmcilroy, 2015/12/15 17:35:44]

nit - /ie/i.e./

[oth, 2015/12/15 22:42:17]

Done.

+  // loop.
+  DCHECK(loop_header_.is_bound());
+  builder()->Bind(&loop_end_);
+  SetBreakTarget(loop_end_);
+  if (next_.is_bound()) {
+    DCHECK(!condition_.is_bound() || next_.offset() >= condition_.offset());
+    SetContinueTarget(next_);
+  } else {
+    DCHECK(condition_.is_bound());
+    DCHECK_GE(condition_.offset(), loop_header_.offset());
+    DCHECK_LE(condition_.offset(), loop_end_.offset());
+    SetContinueTarget(condition_);
+  }
+}
+
+
 void LoopBuilder::SetContinueTarget(const BytecodeLabel& target) {
   BindLabels(target, &continue_sites_);
 }