Set debug break slot at init of loop variable in a for loop.

BUG=102153
TEST=regress-102153.js

Review URL: https://chromiumcodereview.appspot.com/9625011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10963 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/full-codegen.cc

@@ -1159,6 +1159,10 @@ void FullCodeGenerator::VisitForStatement(ForStatement* stmt) {
   Label test, body;
 
   Iteration loop_statement(this, stmt);
+
+  // Set statement position for a break slot before entering the for-body.
+  SetStatementPosition(stmt);
+
   if (stmt->init() != NULL) {
     Visit(stmt->init());
   }
@@ -1173,7 +1177,6 @@ void FullCodeGenerator::VisitForStatement(ForStatement* stmt) {
 
   PrepareForBailoutForId(stmt->ContinueId(), NO_REGISTERS);
   __ bind(loop_statement.continue_label());
-  SetStatementPosition(stmt);
   if (stmt->next() != NULL) {
     Visit(stmt->next());
   }

test/cctest/test-debug.cc

@@ -2745,7 +2745,7 @@ TEST(DebugStepKeyedLoadLoop) {
   foo->Call(env->Global(), kArgc, args);
 
   // With stepping all break locations are hit.
-  CHECK_EQ(33, break_point_hit_count);
+  CHECK_EQ(34, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
@@ -2792,7 +2792,7 @@ TEST(DebugStepKeyedStoreLoop) {
   foo->Call(env->Global(), kArgc, args);
 
   // With stepping all break locations are hit.
-  CHECK_EQ(32, break_point_hit_count);
+  CHECK_EQ(33, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
@@ -2836,7 +2836,7 @@ TEST(DebugStepNamedLoadLoop) {
   foo->Call(env->Global(), 0, NULL);
 
   // With stepping all break locations are hit.
-  CHECK_EQ(53, break_point_hit_count);
+  CHECK_EQ(54, break_point_hit_count);
 
   v8::Debug::SetDebugEventListener(NULL);
   CheckDebuggerUnloaded();
@@ -2880,7 +2880,7 @@ static void DoDebugStepNamedStoreLoop(int expected) {
 
 // Test of the stepping mechanism for named load in a loop.
 TEST(DebugStepNamedStoreLoop) {
-  DoDebugStepNamedStoreLoop(22);
+  DoDebugStepNamedStoreLoop(23);
 }
 
 
@@ -3252,7 +3252,7 @@ TEST(DebugStepForContinue) {
   v8::Handle<v8::Value> argv_10[argc] = { v8::Number::New(10) };
   result = foo->Call(env->Global(), argc, argv_10);
   CHECK_EQ(5, result->Int32Value());
-  CHECK_EQ(50, break_point_hit_count);
+  CHECK_EQ(51, break_point_hit_count);
 
   // Looping 100 times.
   step_action = StepIn;
@@ -3260,7 +3260,7 @@ TEST(DebugStepForContinue) {
   v8::Handle<v8::Value> argv_100[argc] = { v8::Number::New(100) };
   result = foo->Call(env->Global(), argc, argv_100);
   CHECK_EQ(50, result->Int32Value());
-  CHECK_EQ(455, break_point_hit_count);
+  CHECK_EQ(456, break_point_hit_count);
 
   // Get rid of the debug event listener.
   v8::Debug::SetDebugEventListener(NULL);
@@ -3304,7 +3304,7 @@ TEST(DebugStepForBreak) {
   v8::Handle<v8::Value> argv_10[argc] = { v8::Number::New(10) };
   result = foo->Call(env->Global(), argc, argv_10);
   CHECK_EQ(9, result->Int32Value());
-  CHECK_EQ(53, break_point_hit_count);
+  CHECK_EQ(54, break_point_hit_count);
 
   // Looping 100 times.
   step_action = StepIn;
@@ -3312,7 +3312,7 @@ TEST(DebugStepForBreak) {
   v8::Handle<v8::Value> argv_100[argc] = { v8::Number::New(100) };
   result = foo->Call(env->Global(), argc, argv_100);
   CHECK_EQ(99, result->Int32Value());
-  CHECK_EQ(503, break_point_hit_count);
+  CHECK_EQ(504, break_point_hit_count);
 
   // Get rid of the debug event listener.
   v8::Debug::SetDebugEventListener(NULL);

test/mjsunit/debug-stepin-accessor.js

@@ -1,4 +1,4 @@
-// Copyright 2008 the V8 project authors. All rights reserved.
+// Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
@@ -112,8 +112,8 @@ function testGetter1_2() {
 function testGetter1_3() {
   expected_function_name = 'getter1';
   expected_source_line_text = '    return this.name;  // getter 1';
-  debugger;
   for (var i = 1; i < 2; i++) {
+    debugger;
     var x = c['getter' + i];
   }
 }

test/mjsunit/regress/regress-102153.js

@@ -0,0 +1,57 @@
+// Copyright 2012 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --expose-debug-as debug
+
+// Test that the break point is set before initializing the loop variable
+// so that we break before any iteration has been run.
+
+Debug = debug.Debug;
+
+var break_hit = false;
+
+function listener(event, exec_state, event_data, data) {
+  if (event == Debug.DebugEvent.Break) {
+    break_hit = true;
+  }
+}
+
+Debug.setListener(listener);
+
+function test() {
+  for (var i = 0; i < 3; i++) {  // Break here.
+    if (i == 0) break;
+  }
+}
+
+Debug.setBreakPoint(test, 1, 0);
+
+assertTrue(Debug.showBreakPoints(test).indexOf("// Break here.") >= 0);
+
+test();
+
+assertTrue(break_hit);