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#!/usr/bin/env python
# Copyright 2019 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.
"""This program writes a C++ file that can be used to look up whether a given
address matches known object locations. The first argument is the directory
containing the file v8heapconst.py; the second argument is the output .cc file.
"""
import sys
sys.path.insert(0, sys.argv[1])
import v8heapconst
out = """
#include <cstdint>
#include <string>
#include "src/common/ptr-compr-inl.h"
#include "tools/debug_helper/debug-helper-internal.h"
namespace v8 {
namespace internal {
namespace debug_helper_internal {
"""
def iterate_objects(target_space, camel_space_name):
global out
result = []
for (space, offset), (instance_type, name) in v8heapconst.KNOWN_MAPS.items():
if space == target_space:
result.append((offset, name))
for (space, offset), name in v8heapconst.KNOWN_OBJECTS.items():
if space == target_space:
result.append((offset, name))
out = out + '\nstd::string FindKnownObjectIn' + camel_space_name \
+ '(uintptr_t offset) {\n switch (offset) {\n'
for offset, name in result:
out = out + ' case ' + str(offset) + ': return "' + name + '";\n'
out = out + ' default: return "";\n }\n}\n'
iterate_objects('map_space', 'MapSpace')
iterate_objects('read_only_space', 'ReadOnlySpace')
iterate_objects('old_space', 'OldSpace')
def iterate_maps(target_space, camel_space_name):
global out
out = out + '\nint FindKnownMapInstanceTypeIn' + camel_space_name \
+ '(uintptr_t offset) {\n switch (offset) {\n'
for (space, offset), (instance_type, name) in v8heapconst.KNOWN_MAPS.items():
if space == target_space:
out = out + ' case ' + str(offset) + ': return ' + str(instance_type) \
+ ';\n'
out = out + ' default: return -1;\n }\n}\n'
iterate_maps('map_space', 'MapSpace')
iterate_maps('read_only_space', 'ReadOnlySpace')
out = out + '\nvoid FillInUnknownHeapAddresses(' + \
'd::HeapAddresses* heap_addresses, uintptr_t any_uncompressed_ptr) {\n'
if (hasattr(v8heapconst, 'HEAP_FIRST_PAGES')): # Only exists in ptr-compr builds.
out = out + ' if (heap_addresses->any_heap_pointer == 0) {\n'
out = out + ' heap_addresses->any_heap_pointer = any_uncompressed_ptr;\n'
out = out + ' }\n'
expected_spaces = set(['map_space', 'read_only_space', 'old_space'])
for offset, space_name in v8heapconst.HEAP_FIRST_PAGES.items():
if (space_name in expected_spaces):
out = out + ' if (heap_addresses->' + space_name + '_first_page == 0) {\n'
out = out + ' heap_addresses->' + space_name + \
'_first_page = i::DecompressTaggedPointer(any_uncompressed_ptr, ' + \
str(offset) + ');\n'
out = out + ' }\n'
out = out + '}\n'
out = out + '\n}\n}\n}\n'
try:
with open(sys.argv[2], "r") as out_file:
if out == out_file.read():
sys.exit(0) # No modification needed.
except:
pass # File probably doesn't exist; write it.
with open(sys.argv[2], "w") as out_file:
out_file.write(out)
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