[Interpreter] Add switch support.

src/interpreter/control-flow-builders.cc

 // 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 {
 
 
-LoopBuilder::~LoopBuilder() {
-  DCHECK(continue_sites_.empty());
+BreakableControlFlowBuilder::~BreakableControlFlowBuilder() {
   DCHECK(break_sites_.empty());
 }
 
 
-void LoopBuilder::SetContinueTarget(const BytecodeLabel& target) {
-  BindLabels(target, &continue_sites_);
-}
-
-
-void LoopBuilder::SetBreakTarget(const BytecodeLabel& target) {
+void BreakableControlFlowBuilder::SetBreakTarget(const BytecodeLabel& target) {
   BindLabels(target, &break_sites_);
 }
 
 
-void LoopBuilder::EmitJump(ZoneVector<BytecodeLabel>* sites) {
+void BreakableControlFlowBuilder::EmitJump(ZoneVector<BytecodeLabel>* sites) {
   sites->push_back(BytecodeLabel());
   builder()->Jump(&sites->back());
 }
 
 
-void LoopBuilder::EmitJumpIfTrue(ZoneVector<BytecodeLabel>* sites) {
+void BreakableControlFlowBuilder::EmitJumpIfTrue(
+    ZoneVector<BytecodeLabel>* sites) {
   sites->push_back(BytecodeLabel());
   builder()->JumpIfTrue(&sites->back());
 }
 
 
-void LoopBuilder::EmitJumpIfUndefined(ZoneVector<BytecodeLabel>* sites) {
+void BreakableControlFlowBuilder::EmitJumpIfUndefined(
+    ZoneVector<BytecodeLabel>* sites) {
   sites->push_back(BytecodeLabel());
   builder()->JumpIfUndefined(&sites->back());
 }
 
 
-void LoopBuilder::EmitJumpIfNull(ZoneVector<BytecodeLabel>* sites) {
+void BreakableControlFlowBuilder::EmitJumpIfNull(
+    ZoneVector<BytecodeLabel>* sites) {
   sites->push_back(BytecodeLabel());
   builder()->JumpIfNull(&sites->back());
 }
 
 
-void LoopBuilder::BindLabels(const BytecodeLabel& target,
-                             ZoneVector<BytecodeLabel>* sites) {
+void BreakableControlFlowBuilder::EmitJump(ZoneVector<BytecodeLabel>* sites,
+                                           int index) {
+  builder()->Jump(&sites->at(index));
+}
+
+
+void BreakableControlFlowBuilder::EmitJumpIfTrue(
+    ZoneVector<BytecodeLabel>* sites, int index) {
+  builder()->JumpIfTrue(&sites->at(index));
+}
+
+
+void BreakableControlFlowBuilder::BindLabels(const BytecodeLabel& target,
+                                             ZoneVector<BytecodeLabel>* sites) {
   for (size_t i = 0; i < sites->size(); i++) {
     BytecodeLabel& site = sites->at(i);
     builder()->Bind(target, &site);
   }
   sites->clear();
 }
 
+
+LoopBuilder::~LoopBuilder() { DCHECK(continue_sites_.empty()); }
+
+
+void LoopBuilder::SetContinueTarget(const BytecodeLabel& target) {
+  BindLabels(target, &continue_sites_);
+}
+
+
+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);
+}
+
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8