[interpreter, debugger] implement bytecode break location iterator.

src/interpreter/bytecode-generator.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/bytecode-generator.h"
 
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/interpreter/bytecode-register-allocator.h"
 #include "src/interpreter/control-flow-builders.h"
@@ skipping 556 matching lines @@
   if (scope()->NeedsContext()) {
     // Push a new inner context scope for the function.
     VisitNewLocalFunctionContext();
     ContextScope local_function_context(this, scope(), false);
     VisitBuildLocalActivationContext();
     MakeBytecodeBody();
   } else {
     MakeBytecodeBody();
   }
 
+  builder()->EnsureReturn(info->literal());
   set_scope(nullptr);
   set_info(nullptr);
   return builder()->ToBytecodeArray();
 }
 
 
 void BytecodeGenerator::MakeBytecodeBody() {
   // Build the arguments object if it is used.
   VisitArgumentsObject(scope()->arguments());
 
@@ skipping 211 matching lines @@
     // Allocate an outer register allocations scope for the statement.
     RegisterAllocationScope allocation_scope(this);
     Statement* stmt = statements->at(i);
     Visit(stmt);
     if (stmt->IsJump()) break;
   }
 }
 
 
 void BytecodeGenerator::VisitExpressionStatement(ExpressionStatement* stmt) {
+  builder()->SetStatementPosition(stmt);
   VisitForEffect(stmt->expression());
 }
 
 
 void BytecodeGenerator::VisitEmptyStatement(EmptyStatement* stmt) {
 }
 
 
 void BytecodeGenerator::VisitIfStatement(IfStatement* stmt) {
   BytecodeLabel else_label, end_label;
@@ skipping 35 matching lines @@
 }
 
 
 void BytecodeGenerator::VisitBreakStatement(BreakStatement* stmt) {
   execution_control()->Break(stmt->target());
 }
 
 
 void BytecodeGenerator::VisitReturnStatement(ReturnStatement* stmt) {
   VisitForAccumulatorValue(stmt->expression());
+  builder()->SetReturnPosition(info_->literal());
   execution_control()->ReturnAccumulator();
 }
 
 
 void BytecodeGenerator::VisitWithStatement(WithStatement* stmt) {
   VisitForAccumulatorValue(stmt->expression());
   builder()->CastAccumulatorToJSObject();
   VisitNewLocalWithContext();
   VisitInScope(stmt->statement(), stmt->scope());
 }
@@ skipping 335 matching lines @@
 
   // Pending message object is restored on exit.
   builder()->CallRuntime(Runtime::kInterpreterSetPendingMessage, message, 1);
 
   // Dynamic dispatch after the finally-block.
   commands.ApplyDeferredCommands();
 }
 
 
 void BytecodeGenerator::VisitDebuggerStatement(DebuggerStatement* stmt) {
+  builder()->SetStatementPosition(stmt);
   builder()->Debugger();
 }
 
 
 void BytecodeGenerator::VisitFunctionLiteral(FunctionLiteral* expr) {
   // Find or build a shared function info.
   Handle<SharedFunctionInfo> shared_info =
       Compiler::GetSharedFunctionInfo(expr, info()->script(), info());
   CHECK(!shared_info.is_null());  // TODO(rmcilroy): Set stack overflow?
   builder()->CreateClosure(shared_info,
@@ skipping 1643 matching lines @@
 }
 
 
 int BytecodeGenerator::feedback_index(FeedbackVectorSlot slot) const {
   return info()->feedback_vector()->GetIndex(slot);
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8