Fixed tests not having MallocHooks initialized for tests in release mode.

runtime/vm/object_test.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 
 #include "vm/assembler.h"
 #include "vm/class_finalizer.h"
 #include "vm/dart_api_impl.h"
 #include "vm/dart_entry.h"
 #include "vm/debugger.h"
 #include "vm/isolate.h"
+#include "vm/malloc_hooks.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/simulator.h"
 #include "vm/symbols.h"
 #include "vm/unit_test.h"
 #include "vm/code_descriptors.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, write_protect_code);
@@ skipping 2679 matching lines @@
   EXPECT_EQ(instructions.raw(), Instructions::FromPayloadStart(payload_start));
   const Object& result =
       Object::Handle(DartEntry::InvokeFunction(function, Array::empty_array()));
   EXPECT_EQ(1, Smi::Cast(result).Value());
 }
 
 
 // Test for immutability of generated instructions. The test crashes with a
 // segmentation fault when writing into it.
 ISOLATE_UNIT_TEST_CASE(CodeImmutability) {
+  bool stack_trace_collection_enabled =
+      MallocHooks::stack_trace_collection_enabled();
+  MallocHooks::set_stack_trace_collection_enabled(false);
   extern void GenerateIncrement(Assembler * assembler);
   Assembler _assembler_;
   GenerateIncrement(&_assembler_);
   const Function& function = Function::Handle(CreateFunction("Test_Code"));
   Code& code = Code::Handle(Code::FinalizeCode(function, &_assembler_));
   function.AttachCode(code);
   Instructions& instructions = Instructions::Handle(code.instructions());
   uword payload_start = instructions.PayloadStart();
   EXPECT_EQ(instructions.raw(), Instructions::FromPayloadStart(payload_start));
   // Try writing into the generated code, expected to crash.
   *(reinterpret_cast<char*>(payload_start) + 1) = 1;
   if (!FLAG_write_protect_code) {
     // Since this test is expected to crash, crash if write protection of code
     // is switched off.
     // TODO(regis, fschneider): Should this be FATAL() instead?
     OS::DebugBreak();
   }
+  MallocHooks::set_stack_trace_collection_enabled(
+      stack_trace_collection_enabled);
 }
 
 
 // Test for Embedded String object in the instructions.
 ISOLATE_UNIT_TEST_CASE(EmbedStringInCode) {
   extern void GenerateEmbedStringInCode(Assembler * assembler, const char* str);
   const char* kHello = "Hello World!";
   word expected_length = static_cast<word>(strlen(kHello));
   Assembler _assembler_;
   GenerateEmbedStringInCode(&_assembler_, kHello);
@@ skipping 1956 matching lines @@
   // utf32->utf16 conversion.
   int32_t char_codes[] = {0,      0x0a,   0x0d,   0x7f,   0xff,
                           0xffff, 0xd800, 0xdc00, 0xdbff, 0xdfff};
 
   const String& str =
       String::Handle(String::FromUTF32(char_codes, ARRAY_SIZE(char_codes)));
   EXPECT(str.Equals(char_codes, ARRAY_SIZE(char_codes)));
 }
 
 }  // namespace dart