Reapply r1434 and port to ARM.

Review URL: http://codereview.chromium.org/40220

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@1441 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/codegen-arm.cc

@@ -2214,28 +2214,34 @@ void CodeGenerator::VisitTryFinally(TryFinally* node) {
   }
 
   // Unlink from try chain;
-  unlink.Bind();
+  if (unlink.is_linked()) {
+    unlink.Bind();
+  }
 
-  // Preserve TOS result in r0 across stack manipulation.
-  frame_->EmitPop(r0);
-  // Reload sp from the top handler, because some statements that we
-  // break from (eg, for...in) may have left stuff on the stack.
-  __ mov(r3, Operand(ExternalReference(Top::k_handler_address)));
-  __ ldr(sp, MemOperand(r3));
-  // The stack pointer was restored to just below the code slot
-  // (the topmost slot) in the handler.
-  frame_->Forget(frame_->height() - handler_height + 1);
-  const int kNextIndex = (StackHandlerConstants::kNextOffset
-                          + StackHandlerConstants::kAddressDisplacement)
-                       / kPointerSize;
-  __ ldr(r1, frame_->ElementAt(kNextIndex));
-  __ str(r1, MemOperand(r3));
-  ASSERT(StackHandlerConstants::kCodeOffset == 0);  // first field is code
-  // Drop the rest of the handler (not including the already dropped
-  // code slot).
-  frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-  // Restore the result to TOS.
-  frame_->EmitPush(r0);
+  // Control can reach here via a jump to unlink or by falling off the
+  // end of the try block (with no unlinks).
+  if (has_valid_frame()) {
+    // Preserve TOS result in r0 across stack manipulation.
+    frame_->EmitPop(r0);
+    // Reload sp from the top handler, because some statements that we
+    // break from (eg, for...in) may have left stuff on the stack.
+    __ mov(r3, Operand(ExternalReference(Top::k_handler_address)));
+    __ ldr(sp, MemOperand(r3));
+    // The stack pointer was restored to just below the code slot (the
+    // topmost slot) in the handler.
+    frame_->Forget(frame_->height() - handler_height + 1);
+    const int kNextIndex = (StackHandlerConstants::kNextOffset
+                            + StackHandlerConstants::kAddressDisplacement)
+        / kPointerSize;
+    __ ldr(r1, frame_->ElementAt(kNextIndex));
+    __ str(r1, MemOperand(r3));
+    ASSERT(StackHandlerConstants::kCodeOffset == 0);
+    // Drop the rest of the handler (not including the already dropped
+    // code slot).
+    frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
+    // Restore the result to TOS.
+    frame_->EmitPush(r0);
+  }
 
   // --- Finally block ---
   finally_block.Bind();

src/codegen-ia32.cc

@@ -2830,22 +2830,29 @@ void CodeGenerator::VisitTryFinally(TryFinally* node) {
   }
 
   // Unlink from try chain; be careful not to destroy the TOS.
-  unlink.Bind();
-  // Reload sp from the top handler, because some statements that we
-  // break from (eg, for...in) may have left stuff on the stack.
-  // Preserve the TOS in a register across stack manipulation.
-  frame_->EmitPop(eax);
-  ExternalReference handler_address(Top::k_handler_address);
-  __ mov(edx, Operand::StaticVariable(handler_address));
-  const int kNextOffset = StackHandlerConstants::kNextOffset +
-      StackHandlerConstants::kAddressDisplacement;
-  __ lea(esp, Operand(edx, kNextOffset));
-  frame_->Forget(frame_->height() - handler_height);
-
-  frame_->EmitPop(Operand::StaticVariable(handler_address));
-  frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
-  // Next_sp popped.
-  frame_->EmitPush(eax);
+  if (unlink.is_linked()) {
+    unlink.Bind();
+  }
+
+  // Control can reach here via a jump to unlink or by falling off the
+  // end of the try block (with no unlinks).
+  if (has_valid_frame()) {
+    // Reload sp from the top handler, because some statements that we
+    // break from (eg, for...in) may have left stuff on the stack.
+    // Preserve the TOS in a register across stack manipulation.
+    frame_->EmitPop(eax);
+    ExternalReference handler_address(Top::k_handler_address);
+    __ mov(edx, Operand::StaticVariable(handler_address));
+    const int kNextOffset = StackHandlerConstants::kNextOffset +
+        StackHandlerConstants::kAddressDisplacement;
+    __ lea(esp, Operand(edx, kNextOffset));
+    frame_->Forget(frame_->height() - handler_height);
+
+    frame_->EmitPop(Operand::StaticVariable(handler_address));
+    frame_->Drop(StackHandlerConstants::kSize / kPointerSize - 1);
+    // Next_sp popped.
+    frame_->EmitPush(eax);
+  }
 
   // --- Finally block ---
   finally_block.Bind();

test/mjsunit/regress/regress-259.js

+// Copyright 2009 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 that we do not crash when compiling a try/finally with an
+// infinite loop (with no normal exits) in the try block.
+
+// See http://code.google.com/p/v8/issues/detail?id=259
+
+assertThrows("try { while (true) { throw 0; }} finally {}");