Intercept a crash, put debug information onto the stack and then abort gracefully.

BUG=125128
TEST=

Review URL: https://chromiumcodereview.appspot.com/10375009

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11516 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/debug.cc

@@ -892,6 +892,16 @@ void Debug::Iterate(ObjectVisitor* v) {
 }
 
 
+void Debug::PutValuesOnStackAndDie(int start,
+                                   Address c_entry_fp,
+                                   Address last_fp,
+                                   Address larger_fp,
+                                   int count,
+                                   int end) {
+  OS::Abort();
+}
+
+
 Object* Debug::Break(Arguments args) {
   Heap* heap = isolate_->heap();
   HandleScope scope(isolate_);
@@ -984,11 +994,34 @@ Object* Debug::Break(Arguments args) {
       // Count frames until target frame
       int count = 0;
       JavaScriptFrameIterator it(isolate_);
-      while (!it.done() && it.frame()->fp() != thread_local_.last_fp_) {
+      while (!it.done() && it.frame()->fp() < thread_local_.last_fp_) {
         count++;
         it.Advance();
       }
 
+      // Catch the cases that would lead to crashes and capture
+      // - C entry FP at which to start stack crawl.
+      // - FP of the frame at which we plan to stop stepping out (last FP).
+      // - current FP that's larger than last FP.
+      // - Counter for the number of steps to step out.
+      if (it.done()) {
+        // We crawled the entire stack, never reaching last_fp_.
+        PutValuesOnStackAndDie(0xBEEEEEEE,
+                               frame->fp(),
+                               thread_local_.last_fp_,
+                               NULL,
+                               count,
+                               0xFEEEEEEE);
+      } else if (it.frame()->fp() != thread_local_.last_fp_) {
+        // We crawled over last_fp_, without getting a match.
+        PutValuesOnStackAndDie(0xBEEEEEEE,
+                               frame->fp(),
+                               thread_local_.last_fp_,
+                               it.frame()->fp(),
+                               count,
+                               0xFEEEEEEE);
+      }
+
       // If we found original frame
       if (it.frame()->fp() == thread_local_.last_fp_) {
         if (step_count > 1) {

src/debug.h

@@ -232,6 +232,12 @@ class Debug {
   void PreemptionWhileInDebugger();
   void Iterate(ObjectVisitor* v);
 
+  NO_INLINE(void PutValuesOnStackAndDie(int start,
+                                        Address c_entry_fp,
+                                        Address last_fp,
+                                        Address larger_fp,
+                                        int count,
+                                        int end));
   Object* Break(Arguments args);
   void SetBreakPoint(Handle<SharedFunctionInfo> shared,
                      Handle<Object> break_point_object,