Optionally export metadata with libv8 to enable debuggers to inspect V8 state.

Review URL: https://chromiumcodereview.appspot.com/8803024
Patch from David Pacheco <dap@joyent.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@10596 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

AUTHORS

@@ -8,6 +8,7 @@ Sigma Designs Inc.
 ARM Ltd.
 Hewlett-Packard Development Company, LP
 Igalia, S.L.
+Joyent, Inc.
 
 Akinori MUSHA <knu@FreeBSD.org>
 Alexander Botero-Lowry <alexbl@FreeBSD.org>

build/common.gypi

@@ -85,6 +85,11 @@
     'v8_use_liveobjectlist%': 'false',
     'werror%': '-Werror',
 
+    # With post mortem support enabled, metadata is embedded into libv8 that
+    # describes various parameters of the VM for use by debuggers. See
+    # tools/gen-postmortem-metadata.py for details.
+    'v8_postmortem_support%': 'false',
+
     # For a shared library build, results in "libv8-<(soname_version).so".
     'soname_version%': '',
   },

tools/gyp/v8.gyp

@@ -730,6 +730,11 @@
                 'V8_SHARED',
               ],
             }],
+            ['v8_postmortem_support=="true"', {
+              'sources': [
+                '<(SHARED_INTERMEDIATE_DIR)/debug-support.cc',
+              ]
+            }],
           ],
         },
         {
@@ -805,6 +810,34 @@
             },
           ],
         },
+        {
+          'target_name': 'postmortem-metadata',
+          'type': 'none',
+          'variables': {
+            'heapobject_files': [
+                '../../src/objects.h',
+                '../../src/objects-inl.h',
+            ],
+          },
+          'actions': [
+              {
+                'action_name': 'gen-postmortem-metadata',
+                'inputs': [
+                  '../../tools/gen-postmortem-metadata.py',
+                  '<@(heapobject_files)',
+                ],
+                'outputs': [
+                  '<(SHARED_INTERMEDIATE_DIR)/debug-support.cc',
+                ],
+                'action': [
+                  'python',
+                  '../../tools/gen-postmortem-metadata.py',
+                  '<@(_outputs)',
+                  '<@(heapobject_files)'
+                ]
+              }
+           ]
+        },
         {
           'target_name': 'mksnapshot',
           'type': 'executable',