Emit unwinding information for TurboFan code.

src/compiler/unwinding-info-writer.h

Index: src/compiler/unwinding-info-writer.h
diff --git a/src/compiler/unwinding-info-writer.h b/src/compiler/unwinding-info-writer.h
new file mode 100644
index 0000000000000000000000000000000000000000..23f8dd351eeadbb0ff1b3295337dc19c88ac55e7
--- /dev/null
+++ b/src/compiler/unwinding-info-writer.h
@@ -0,0 +1,26 @@
+// Copyright 2014 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.
+
+#ifndef V8_COMPILER_UNWINDING_INFO_WRITER_H_
+#define V8_COMPILER_UNWINDING_INFO_WRITER_H_
+
+#if V8_TARGET_ARCH_ARM
+#include "src/compiler/arm/unwinding-info-writer-arm.h"
+#elif V8_TARGET_ARCH_ARM64
+#include "src/compiler/arm64/unwinding-info-writer-arm64.h"
+#elif V8_TARGET_ARCH_IA32
+#include "src/compiler/ia32/unwinding-info-writer-ia32.h"

[Jarin, 2016/07/06 07:09:42]

Instead of including the same unimplemented unwinding info writers here, could
not you just put the unimplemented version of the class here and only include
the headers with the real implementations? Or do you intend to implement
all/most of the remaining architectures soon?

[Stefano Sanfilippo, 2016/07/06 13:25:10]

This was initially meant to be a placeholder, but on a second thought it's
better to follow your suggestion, since Linux perf presently appears to only
support x64, arm, arm64 and ia32 anyway.

+#elif V8_TARGET_ARCH_MIPS
+#include "src/compiler/mips/unwinding-info-writer-mips.h"
+#elif V8_TARGET_ARCH_MIPS64
+#include "src/compiler/mips64/unwinding-info-writer-mips64.h"
+#elif V8_TARGET_ARCH_S390
+#include "src/compiler/s390/unwinding-info-writer-s390.h"
+#elif V8_TARGET_ARCH_X64
+#include "src/compiler/x64/unwinding-info-writer-x64.h"
+#elif V8_TARGET_ARCH_X87
+#include "src/compiler/x87/unwinding-info-writer-x87.h"
+#endif
+
+#endif