Enable preaging of code objects when --optimize-for-size.

src/v8globals.h

 // Copyright 2012 the V8 project authors. 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.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 195 matching lines @@
 enum VisitMode {
   VISIT_ALL,
   VISIT_ALL_IN_SCAVENGE,
   VISIT_ALL_IN_SWEEP_NEWSPACE,
   VISIT_ONLY_STRONG
 };
 
 // Flag indicating whether code is built into the VM (one of the natives files).
 enum NativesFlag { NOT_NATIVES_CODE, NATIVES_CODE };
 
+static const int kPrologueOffsetNotSet = -1;

[danno, 2013/10/04 16:30:09]

This is probably better suited to be in codegen.h

[rmcilroy, 2013/10/07 10:56:13]

It is needed in a number of .h files (heap.h, factory.h, etc). If I move this to
codegen.h I need to add codegen.h to these headers includes, which seems to
cause a bunch of compile errors - e.g.:

In file included from ../src/gdb-jit.h:41:0,
                 from ../src/assembler.h:42,
                 from ../src/code-stubs.h:32,
                 from ../src/codegen.h:31,
                 from ../src/heap.h:35,
                 from ../src/elements.h:33,
                 from ../src/objects-inl.h:38,
                 from ../src/v8.h:61,
                 from ../src/accessors.cc:28:
../src/factory.h:460:13: error: ‘ROOT_ACCESSOR’ has not been declared
../src/factory.h:460:26: error: ISO C++ forbids declaration of ‘ROOT_LIST’ with
no type [-fpermissive]

Any ideas on how to solve this?

 
 // A CodeDesc describes a buffer holding instructions and relocation
 // information. The instructions start at the beginning of the buffer
 // and grow forward, the relocation information starts at the end of
 // the buffer and grows backward.
 //
 //  |<--------------- buffer_size ---------------->|
 //  |<-- instr_size -->|        |<-- reloc_size -->|
 //  +==================+========+==================+
 //  |   instructions   |  free  |    reloc info    |
@@ skipping 340 matching lines @@
 
 
 enum MinusZeroMode {
   TREAT_MINUS_ZERO_AS_ZERO,
   FAIL_ON_MINUS_ZERO
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_V8GLOBALS_H_