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changeset 6083:7b5d132c3a70 jdk7u76-b01

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8046233: VerifyError on backward branch Summary: Check that both blocks have same uninitialized object Reviewed-by: acorn, coleenp
author hseigel
date Fri, 29 Aug 2014 12:40:56 -0400
parents b577ea5b8da4
children 10c2cb5743ca
files src/share/vm/classfile/stackMapFrame.cpp src/share/vm/classfile/stackMapFrame.hpp src/share/vm/classfile/stackMapTable.cpp
diffstat 3 files changed, 16 insertions(+), 8 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/classfile/stackMapFrame.cpp	Tue Aug 19 04:24:52 2014 -0700
+++ b/src/share/vm/classfile/stackMapFrame.cpp	Fri Aug 29 12:40:56 2014 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -54,15 +54,19 @@
   return frame;
 }
 
-bool StackMapFrame::has_new_object() const {
+// Return true if frame has an uninitialized (new) object that differs
+// from the target frame's object.
+bool StackMapFrame::has_nonmatching_new_object(const StackMapFrame *target_frame) const {
   int32_t i;
   for (i = 0; i < _max_locals; i++) {
-    if (_locals[i].is_uninitialized()) {
+    if (_locals[i].is_uninitialized() &&
+        !_locals[i].equals(target_frame->_locals[i])) {
       return true;
     }
   }
   for (i = 0; i < _stack_size; i++) {
-    if (_stack[i].is_uninitialized()) {
+    if (_stack[i].is_uninitialized() &&
+        !_stack[i].equals(target_frame->_stack[i])) {
       return true;
     }
   }
--- a/src/share/vm/classfile/stackMapFrame.hpp	Tue Aug 19 04:24:52 2014 -0700
+++ b/src/share/vm/classfile/stackMapFrame.hpp	Fri Aug 29 12:40:56 2014 -0400
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2014, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -155,8 +155,9 @@
     const methodHandle m, VerificationType thisKlass, TRAPS);
 
   // Search local variable type array and stack type array.
-  // Return true if an uninitialized object is found.
-  bool has_new_object() const;
+  // Return true if an uninitialized object is found that is
+  // not equal to the corresponding object on the target frame.
+  bool has_nonmatching_new_object(const StackMapFrame *target_frame) const;
 
   // Search local variable type array and stack type array.
   // Set every element with type of old_object to new_object.
--- a/src/share/vm/classfile/stackMapTable.cpp	Tue Aug 19 04:24:52 2014 -0700
+++ b/src/share/vm/classfile/stackMapTable.cpp	Fri Aug 29 12:40:56 2014 -0400
@@ -138,7 +138,10 @@
 
 void StackMapTable::check_new_object(
     const StackMapFrame* frame, int32_t target, TRAPS) const {
-  if (frame->offset() > target && frame->has_new_object()) {
+  int frame_index = get_index_from_offset(target);
+  assert(frame_index >= 0 && frame_index < _frame_count, "bad frame index");
+  if (frame->offset() > target &&
+      frame->has_nonmatching_new_object(_frame_array[frame_index])) {
     frame->verifier()->verify_error(
         ErrorContext::bad_code(frame->offset()),
         "Uninitialized object exists on backward branch %d", target);