Fix code generation bug on ARM in classic codegen.

Review URL: http://codereview.chromium.org/6246045

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@6579 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/arm/jump-target-arm.cc

@@ -143,6 +143,16 @@ void JumpTarget::DoBind() {
       entry_frame_set_ = true;
     } else {
       cgen()->frame()->MergeTo(&entry_frame_);
+      // On fall through we may have to merge both ways.
+      if (direction_ != FORWARD_ONLY) {
+        // This will not need to adjust the virtual frame entries that are
+        // register allocated since that was done above and they now match.
+        // But it does need to adjust the entry_frame_ of this jump target
+        // to make it potentially less optimistic.  Later code can branch back
+        // to this jump target and we need to assert that that code does not
+        // have weaker assumptions about types.
+        entry_frame_.MergeTo(cgen()->frame());
+      }
     }
   } else {
     // If there is no current frame we must have an entry frame which we can

src/arm/virtual-frame-arm.cc

@@ -68,6 +68,8 @@ void VirtualFrame::PopToR0() {
 
 void VirtualFrame::MergeTo(const VirtualFrame* expected, Condition cond) {
   if (Equals(expected)) return;
+  ASSERT((expected->tos_known_smi_map_ & tos_known_smi_map_) ==
+         expected->tos_known_smi_map_);
   ASSERT(expected->IsCompatibleWith(this));
   MergeTOSTo(expected->top_of_stack_state_, cond);
   ASSERT(register_allocation_map_ == expected->register_allocation_map_);
@@ -76,7 +78,7 @@ void VirtualFrame::MergeTo(const VirtualFrame* expected, Condition cond) {
 
 void VirtualFrame::MergeTo(VirtualFrame* expected, Condition cond) {
   if (Equals(expected)) return;
-  expected->tos_known_smi_map_ &= tos_known_smi_map_;
+  tos_known_smi_map_ &= expected->tos_known_smi_map_;
   MergeTOSTo(expected->top_of_stack_state_, cond);
   ASSERT(register_allocation_map_ == expected->register_allocation_map_);
 }

test/mjsunit/regress/regress-3408144.js

+// Copyright 2011 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.
+
+// Test incorrect code generation for alternations on ARM.
+
+
+// Flags: --nofull-compiler
+
+function foo() {
+  return (0 > ("10"||10) - 1);
+}
+
+assertFalse(foo());