[assembler] Introduce proper AssemblerBase::Print() for improved debuggability.

src/assembler.cc

 // Copyright (c) 1994-2006 Sun Microsystems Inc.
 // 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.
 //
@@ skipping 28 matching lines @@
 #include "src/base/cpu.h"
 #include "src/base/functional.h"
 #include "src/base/lazy-instance.h"
 #include "src/base/platform/platform.h"
 #include "src/base/utils/random-number-generator.h"
 #include "src/builtins.h"
 #include "src/codegen.h"
 #include "src/counters.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
+#include "src/disassembler.h"
 #include "src/execution.h"
 #include "src/ic/ic.h"
 #include "src/ic/stub-cache.h"
+#include "src/ostreams.h"
 #include "src/profiler/cpu-profiler.h"
 #include "src/regexp/jsregexp.h"
 #include "src/regexp/regexp-macro-assembler.h"
 #include "src/regexp/regexp-stack.h"
 #include "src/register-configuration.h"
 #include "src/runtime/runtime.h"
 #include "src/simulator.h"  // For flushing instruction cache.
 #include "src/snapshot/serialize.h"
 #include "src/token.h"
 
@@ skipping 146 matching lines @@
   Isolate* isolate;
 #if defined(USE_SIMULATOR)
   isolate = Isolate::Current();
 #else
   isolate = nullptr;
 #endif  // USE_SIMULATOR
   FlushICache(isolate, start, size);
 }
 
 
+void AssemblerBase::Print() {
+  OFStream os(stdout);
+  v8::internal::Disassembler::Decode(isolate(), &os, buffer_, pc_, nullptr);
+}
+
+
 // -----------------------------------------------------------------------------
 // Implementation of PredictableCodeSizeScope
 
 PredictableCodeSizeScope::PredictableCodeSizeScope(AssemblerBase* assembler)
     : PredictableCodeSizeScope(assembler, -1) {}
 
 
 PredictableCodeSizeScope::PredictableCodeSizeScope(AssemblerBase* assembler,
                                                    int expected_size)
     : assembler_(assembler),
@@ skipping 1664 matching lines @@
 
 
 void Assembler::DataAlign(int m) {
   DCHECK(m >= 2 && base::bits::IsPowerOfTwo32(m));
   while ((pc_offset() & (m - 1)) != 0) {
     db(0);
   }
 }
 }  // namespace internal
 }  // namespace v8