gen-postmortem-metadata.py: fix code generator

tools/gen-postmortem-metadata.py

 #!/usr/bin/env python
 
 #
 # 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.
@@ skipping 60 matching lines @@
 
     { 'name': 'FailureTag',             'value': 'kFailureTag' },
     { 'name': 'FailureTagMask',         'value': 'kFailureTagMask' },
     { 'name': 'HeapObjectTag',          'value': 'kHeapObjectTag' },
     { 'name': 'HeapObjectTagMask',      'value': 'kHeapObjectTagMask' },
     { 'name': 'SmiTag',                 'value': 'kSmiTag' },
     { 'name': 'SmiTagMask',             'value': 'kSmiTagMask' },
     { 'name': 'SmiValueShift',          'value': 'kSmiTagSize' },
     { 'name': 'PointerSizeLog2',        'value': 'kPointerSizeLog2' },
 
-    { 'name': 'prop_idx_transitions',
-        'value': 'DescriptorArray::kTransitionsIndex' },
+    { 'name': 'prop_idx_elements_transitions',
+        'value': 'TransitionArray::kElementsTransitionIndex' },
+    { 'name': 'prop_idx_prototype_transitions',
+        'value': 'TransitionArray::kPrototypeTransitionsIndex' },
     { 'name': 'prop_idx_first',
-        'value': 'DescriptorArray::kFirstIndex' },
+        'value': 'TransitionArray::kFirstIndex' },

[Toon Verwaest, 2012/08/21 13:29:46]

All these changes change the semantics of the fields. Is this on purpose? Do we
care about transitions rather than descriptors now?

+
     { 'name': 'prop_type_field',
         'value': 'FIELD' },
     { 'name': 'prop_type_first_phantom',
-        'value': 'MAP_TRANSITION' },
+        'value': 'Code::MAP_TRANSITION' },
     { 'name': 'prop_type_mask',
         'value': 'PropertyDetails::TypeField::kMask' },
 
     { 'name': 'off_fp_context',
         'value': 'StandardFrameConstants::kContextOffset' },
     { 'name': 'off_fp_marker',
         'value': 'StandardFrameConstants::kMarkerOffset' },
     { 'name': 'off_fp_function',
         'value': 'JavaScriptFrameConstants::kFunctionOffset' },
     { 'name': 'off_fp_args',
         'value': 'JavaScriptFrameConstants::kLastParameterOffset' },
 ];
 
 #
 # The following useful fields are missing accessors, so we define fake ones.
 #
 extras_accessors = [
     'HeapObject, map, Map, kMapOffset',
     'JSObject, elements, Object, kElementsOffset',
     'FixedArray, data, uintptr_t, kHeaderSize',
     'Map, instance_attributes, int, kInstanceAttributesOffset',
-    'Map, instance_descriptors, int, kInstanceDescriptorsOrBitField3Offset',
+    'Map, instance_descriptors, uintptr_t, kTransitionsOrBackPointerOffset',

[Toon Verwaest, 2012/08/21 13:29:46]

This field does not contain the instance_descriptors but rather either the
transition array or the back pointer. If it contains a transition array, that
array will store the descriptors.

     'Map, inobject_properties, int, kInObjectPropertiesOffset',
     'Map, instance_size, int, kInstanceSizeOffset',
     'HeapNumber, value, double, kValueOffset',
     'ConsString, first, String, kFirstOffset',
     'ConsString, second, String, kSecondOffset',
     'ExternalString, resource, Object, kResourceOffset',
     'SeqAsciiString, chars, char, kHeaderSize',
     'SharedFunctionInfo, code, Code, kCodeOffset',
     'Code, instruction_start, uintptr_t, kHeaderSize',
     'Code, instruction_size, int, kInstructionSizeOffset',
@@ skipping 351 matching lines @@
 
         out.write(footer);
 
 if (len(sys.argv) < 4):
         print('usage: %s output.cc objects.h objects-inl.h' % sys.argv[0]);
         sys.exit(2);
 
 load_objects();
 load_fields();
 emit_config();