Do not leak message object beyond try-catch.

src/arm/full-codegen-arm.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 5334 matching lines @@
 
   // Store result register while executing finally block.
   __ push(r1);
 
   // Store pending message while executing finally block.
   ExternalReference pending_message_obj =
       ExternalReference::address_of_pending_message_obj(isolate());
   __ mov(ip, Operand(pending_message_obj));
   __ ldr(r1, MemOperand(ip));
   __ push(r1);
+
+  ClearPendingMessage();
 }
 
 
 void FullCodeGenerator::ExitFinallyBlock() {
   DCHECK(!result_register().is(r1));
   // Restore pending message from stack.
   __ pop(r1);
   ExternalReference pending_message_obj =
       ExternalReference::address_of_pending_message_obj(isolate());
   __ mov(ip, Operand(pending_message_obj));
   __ str(r1, MemOperand(ip));
 
   // Restore result register from stack.
   __ pop(r1);
 
   // Uncook return address and return.
   __ pop(result_register());
   __ SmiUntag(r1);
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
+void FullCodeGenerator::ClearPendingMessage() {
+  DCHECK(!result_register().is(r1));
+  ExternalReference pending_message_obj =
+      ExternalReference::address_of_pending_message_obj(isolate());
+  __ LoadRoot(r1, Heap::kTheHoleValueRootIndex);
+  __ mov(ip, Operand(pending_message_obj));
+  __ str(r1, MemOperand(ip));
+}
+
+
 #undef __
 
 
 static Address GetInterruptImmediateLoadAddress(Address pc) {
   Address load_address = pc - 2 * Assembler::kInstrSize;
   if (!FLAG_enable_ool_constant_pool) {
     DCHECK(Assembler::IsLdrPcImmediateOffset(Memory::int32_at(load_address)));
   } else if (Assembler::IsLdrPpRegOffset(Memory::int32_at(load_address))) {
     // This is an extended constant pool lookup.
     if (CpuFeatures::IsSupported(ARMv7)) {
@@ skipping 125 matching lines @@
 
   DCHECK(interrupt_address ==
          isolate->builtins()->OsrAfterStackCheck()->entry());
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM