Initial support for emitting unwinding information in perf jitdump.

src/globals.h

 // 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.
 
 #ifndef V8_GLOBALS_H_
 #define V8_GLOBALS_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 536 matching lines @@
 //  |
 //  buffer
 
 struct CodeDesc {
   byte* buffer;
   int buffer_size;
   int instr_size;
   int reloc_size;
   int constant_pool_size;
   Assembler* origin;
+  byte* unwinding_info;
+  int unwinding_info_size;

[rmcilroy, 2016/06/21 13:47:43]

nit - move above Assembler* origin

[Stefano Sanfilippo, 2016/06/23 15:23:43]

Done.

 };
 
 
 // Callback function used for checking constraints when copying/relocating
 // objects. Returns true if an object can be copied/relocated from its
 // old_addr to a new_addr.
 typedef bool (*ConstraintCallback)(Address new_addr, Address old_addr);
 
 
 // Callback function on inline caches, used for iterating over inline caches
@@ skipping 522 matching lines @@
   return static_cast<uint32_t>(bit_cast<uintptr_t>(address) >>
                                kPointerSizeLog2);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 namespace i = v8::internal;
 
 #endif  // V8_GLOBALS_H_