[debugger] make step positions for for-of compatible with interpreter.

src/full-codegen/full-codegen.cc

 // Copyright 2012 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/full-codegen/full-codegen.h"
 
 #include "src/ast/ast-numbering.h"
 #include "src/ast/ast.h"
 #include "src/ast/prettyprinter.h"
 #include "src/ast/scopeinfo.h"
@@ skipping 634 matching lines @@
 void FullCodeGenerator::SetStatementPosition(
     Statement* stmt, FullCodeGenerator::InsertBreak insert_break) {
   if (stmt->position() == RelocInfo::kNoPosition) return;
   bool recorded = RecordStatementPosition(masm_, stmt->position());
   if (recorded && insert_break == INSERT_BREAK && info_->is_debug() &&
       !stmt->IsDebuggerStatement()) {
     DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_POSITION);
   }
 }
 
-
-void FullCodeGenerator::SetExpressionPosition(
-    Expression* expr, FullCodeGenerator::InsertBreak insert_break) {
+void FullCodeGenerator::SetExpressionPosition(Expression* expr) {
   if (expr->position() == RelocInfo::kNoPosition) return;
-  bool recorded = RecordPosition(masm_, expr->position());
-  if (recorded && insert_break == INSERT_BREAK && info_->is_debug()) {
-    DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_POSITION);
-  }
+  RecordPosition(masm_, expr->position());
 }
 
 
 void FullCodeGenerator::SetExpressionAsStatementPosition(Expression* expr) {
   if (expr->position() == RelocInfo::kNoPosition) return;
   bool recorded = RecordStatementPosition(masm_, expr->position());
   if (recorded && info_->is_debug()) {
     DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_POSITION);
   }
 }
@@ skipping 551 matching lines @@
 }
 
 
 void FullCodeGenerator::VisitForOfStatement(ForOfStatement* stmt) {
   Comment cmnt(masm_, "[ ForOfStatement");
 
   Iteration loop_statement(this, stmt);
   increment_loop_depth();
 
   // var iterator = iterable[Symbol.iterator]();
+  SetExpressionAsStatementPosition(stmt->assign_iterator());
   VisitForEffect(stmt->assign_iterator());
 
   // Loop entry.
   __ bind(loop_statement.continue_label());
 
   // result = iterator.next()
   SetExpressionAsStatementPosition(stmt->next_result());
   VisitForEffect(stmt->next_result());
 
   // if (result.done) break;
@@ skipping 696 matching lines @@
   return var->scope()->is_nonlinear() ||
          var->initializer_position() >= proxy->position();
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8