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481 lines
17 KiB
481 lines
17 KiB
#!/usr/bin/env python
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#
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# Copyright 2012 the V8 project authors. All rights reserved.
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions are
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# met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above
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# copyright notice, this list of conditions and the following
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# disclaimer in the documentation and/or other materials provided
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# with the distribution.
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# * Neither the name of Google Inc. nor the names of its
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# contributors may be used to endorse or promote products derived
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# from this software without specific prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#
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#
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# Emits a C++ file to be compiled and linked into libv8 to support postmortem
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# debugging tools. Most importantly, this tool emits constants describing V8
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# internals:
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#
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# v8dbg_type_CLASS__TYPE = VALUE Describes class type values
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# v8dbg_class_CLASS__FIELD__TYPE = OFFSET Describes class fields
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# v8dbg_parent_CLASS__PARENT Describes class hierarchy
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# v8dbg_frametype_NAME = VALUE Describes stack frame values
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# v8dbg_off_fp_NAME = OFFSET Frame pointer offsets
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# v8dbg_prop_NAME = OFFSET Object property offsets
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# v8dbg_NAME = VALUE Miscellaneous values
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#
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# These constants are declared as global integers so that they'll be present in
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# the generated libv8 binary.
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#
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import re
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import sys
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#
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# Miscellaneous constants, tags, and masks used for object identification.
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#
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consts_misc = [
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{ 'name': 'FirstNonstringType', 'value': 'FIRST_NONSTRING_TYPE' },
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{ 'name': 'IsNotStringMask', 'value': 'kIsNotStringMask' },
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{ 'name': 'StringTag', 'value': 'kStringTag' },
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{ 'name': 'NotStringTag', 'value': 'kNotStringTag' },
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{ 'name': 'StringEncodingMask', 'value': 'kStringEncodingMask' },
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{ 'name': 'TwoByteStringTag', 'value': 'kTwoByteStringTag' },
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{ 'name': 'AsciiStringTag', 'value': 'kAsciiStringTag' },
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{ 'name': 'StringRepresentationMask',
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'value': 'kStringRepresentationMask' },
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{ 'name': 'SeqStringTag', 'value': 'kSeqStringTag' },
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{ 'name': 'ConsStringTag', 'value': 'kConsStringTag' },
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{ 'name': 'ExternalStringTag', 'value': 'kExternalStringTag' },
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{ 'name': 'FailureTag', 'value': 'kFailureTag' },
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{ 'name': 'FailureTagMask', 'value': 'kFailureTagMask' },
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{ 'name': 'HeapObjectTag', 'value': 'kHeapObjectTag' },
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{ 'name': 'HeapObjectTagMask', 'value': 'kHeapObjectTagMask' },
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{ 'name': 'SmiTag', 'value': 'kSmiTag' },
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{ 'name': 'SmiTagMask', 'value': 'kSmiTagMask' },
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{ 'name': 'SmiValueShift', 'value': 'kSmiTagSize' },
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{ 'name': 'PointerSizeLog2', 'value': 'kPointerSizeLog2' },
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{ 'name': 'prop_idx_transitions',
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'value': 'DescriptorArray::kTransitionsIndex' },
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{ 'name': 'prop_idx_first',
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'value': 'DescriptorArray::kFirstIndex' },
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{ 'name': 'prop_type_field',
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'value': 'FIELD' },
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{ 'name': 'prop_type_first_phantom',
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'value': 'MAP_TRANSITION' },
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{ 'name': 'prop_type_mask',
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'value': 'PropertyDetails::TypeField::kMask' },
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{ 'name': 'off_fp_context',
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'value': 'StandardFrameConstants::kContextOffset' },
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{ 'name': 'off_fp_marker',
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'value': 'StandardFrameConstants::kMarkerOffset' },
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{ 'name': 'off_fp_function',
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'value': 'JavaScriptFrameConstants::kFunctionOffset' },
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{ 'name': 'off_fp_args',
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'value': 'JavaScriptFrameConstants::kLastParameterOffset' },
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];
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#
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# The following useful fields are missing accessors, so we define fake ones.
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#
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extras_accessors = [
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'HeapObject, map, Map, kMapOffset',
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'JSObject, elements, Object, kElementsOffset',
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'FixedArray, data, uintptr_t, kHeaderSize',
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'Map, instance_attributes, int, kInstanceAttributesOffset',
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'Map, instance_descriptors, int, kInstanceDescriptorsOrBitField3Offset',
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'Map, inobject_properties, int, kInObjectPropertiesOffset',
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'Map, instance_size, int, kInstanceSizeOffset',
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'HeapNumber, value, double, kValueOffset',
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'ConsString, first, String, kFirstOffset',
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'ConsString, second, String, kSecondOffset',
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'ExternalString, resource, Object, kResourceOffset',
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'SeqAsciiString, chars, char, kHeaderSize',
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'SharedFunctionInfo, code, Code, kCodeOffset',
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'Code, instruction_start, uintptr_t, kHeaderSize',
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'Code, instruction_size, int, kInstructionSizeOffset',
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];
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#
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# The following is a whitelist of classes we expect to find when scanning the
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# source code. This list is not exhaustive, but it's still useful to identify
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# when this script gets out of sync with the source. See load_objects().
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#
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expected_classes = [
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'ConsString', 'FixedArray', 'HeapNumber', 'JSArray', 'JSFunction',
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'JSObject', 'JSRegExp', 'JSValue', 'Map', 'Oddball', 'Script',
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'SeqAsciiString', 'SharedFunctionInfo'
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];
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#
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# The following structures store high-level representations of the structures
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# for which we're going to emit descriptive constants.
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#
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types = {}; # set of all type names
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typeclasses = {}; # maps type names to corresponding class names
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klasses = {}; # known classes, including parents
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fields = []; # field declarations
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header = '''
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/*
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* This file is generated by %s. Do not edit directly.
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*/
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#include "v8.h"
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#include "frames.h"
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#include "frames-inl.h" /* for architecture-specific frame constants */
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using namespace v8::internal;
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extern "C" {
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/* stack frame constants */
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#define FRAME_CONST(value, klass) \
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int v8dbg_frametype_##klass = StackFrame::value;
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STACK_FRAME_TYPE_LIST(FRAME_CONST)
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#undef FRAME_CONST
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''' % sys.argv[0];
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footer = '''
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}
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'''
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#
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# Loads class hierarchy and type information from "objects.h".
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#
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def load_objects():
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objfilename = sys.argv[2];
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objfile = open(objfilename, 'r');
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in_insttype = False;
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typestr = '';
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#
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# Construct a dictionary for the classes we're sure should be present.
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#
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checktypes = {};
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for klass in expected_classes:
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checktypes[klass] = True;
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#
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# Iterate objects.h line-by-line to collect type and class information.
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# For types, we accumulate a string representing the entire InstanceType
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# enum definition and parse it later because it's easier to do so
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# without the embedded newlines.
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#
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for line in objfile:
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if (line.startswith('enum InstanceType {')):
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in_insttype = True;
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continue;
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if (in_insttype and line.startswith('};')):
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in_insttype = False;
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continue;
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line = re.sub('//.*', '', line.rstrip().lstrip());
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if (in_insttype):
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typestr += line;
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continue;
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match = re.match('class (\w[^\s:]*)(: public (\w[^\s{]*))?\s*{',
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line);
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if (match):
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klass = match.group(1);
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pklass = match.group(3);
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klasses[klass] = { 'parent': pklass };
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#
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# Process the instance type declaration.
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#
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entries = typestr.split(',');
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for entry in entries:
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types[re.sub('\s*=.*', '', entry).lstrip()] = True;
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#
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# Infer class names for each type based on a systematic transformation.
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# For example, "JS_FUNCTION_TYPE" becomes "JSFunction". We find the
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# class for each type rather than the other way around because there are
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# fewer cases where one type maps to more than one class than the other
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# way around.
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#
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for type in types:
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#
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# Symbols and Strings are implemented using the same classes.
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#
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usetype = re.sub('SYMBOL_', 'STRING_', type);
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#
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# REGEXP behaves like REG_EXP, as in JS_REGEXP_TYPE => JSRegExp.
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#
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usetype = re.sub('_REGEXP_', '_REG_EXP_', usetype);
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#
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# Remove the "_TYPE" suffix and then convert to camel case,
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# except that a "JS" prefix remains uppercase (as in
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# "JS_FUNCTION_TYPE" => "JSFunction").
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#
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if (not usetype.endswith('_TYPE')):
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continue;
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usetype = usetype[0:len(usetype) - len('_TYPE')];
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parts = usetype.split('_');
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cctype = '';
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if (parts[0] == 'JS'):
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cctype = 'JS';
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start = 1;
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else:
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cctype = '';
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start = 0;
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for ii in range(start, len(parts)):
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part = parts[ii];
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cctype += part[0].upper() + part[1:].lower();
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#
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# Mapping string types is more complicated. Both types and
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# class names for Strings specify a representation (e.g., Seq,
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# Cons, External, or Sliced) and an encoding (TwoByte or Ascii),
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# In the simplest case, both of these are explicit in both
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# names, as in:
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#
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# EXTERNAL_ASCII_STRING_TYPE => ExternalAsciiString
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#
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# However, either the representation or encoding can be omitted
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# from the type name, in which case "Seq" and "TwoByte" are
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# assumed, as in:
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#
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# STRING_TYPE => SeqTwoByteString
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#
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# Additionally, sometimes the type name has more information
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# than the class, as in:
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#
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# CONS_ASCII_STRING_TYPE => ConsString
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#
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# To figure this out dynamically, we first check for a
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# representation and encoding and add them if they're not
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# present. If that doesn't yield a valid class name, then we
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# strip out the representation.
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#
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if (cctype.endswith('String')):
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if (cctype.find('Cons') == -1 and
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cctype.find('External') == -1 and
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cctype.find('Sliced') == -1):
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if (cctype.find('Ascii') != -1):
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cctype = re.sub('AsciiString$',
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'SeqAsciiString', cctype);
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else:
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cctype = re.sub('String$',
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'SeqString', cctype);
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if (cctype.find('Ascii') == -1):
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cctype = re.sub('String$', 'TwoByteString',
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cctype);
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if (not (cctype in klasses)):
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cctype = re.sub('Ascii', '', cctype);
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cctype = re.sub('TwoByte', '', cctype);
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#
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# Despite all that, some types have no corresponding class.
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#
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if (cctype in klasses):
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typeclasses[type] = cctype;
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if (cctype in checktypes):
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del checktypes[cctype];
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if (len(checktypes) > 0):
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for klass in checktypes:
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print('error: expected class \"%s\" not found' % klass);
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sys.exit(1);
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#
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# For a given macro call, pick apart the arguments and return an object
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# describing the corresponding output constant. See load_fields().
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#
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def parse_field(call):
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# Replace newlines with spaces.
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for ii in range(0, len(call)):
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if (call[ii] == '\n'):
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call[ii] == ' ';
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idx = call.find('(');
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kind = call[0:idx];
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rest = call[idx + 1: len(call) - 1];
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args = re.split('\s*,\s*', rest);
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consts = [];
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if (kind == 'ACCESSORS' or kind == 'ACCESSORS_GCSAFE'):
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klass = args[0];
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field = args[1];
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dtype = args[2];
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offset = args[3];
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return ({
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'name': 'class_%s__%s__%s' % (klass, field, dtype),
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'value': '%s::%s' % (klass, offset)
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});
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assert(kind == 'SMI_ACCESSORS');
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klass = args[0];
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field = args[1];
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offset = args[2];
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return ({
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'name': 'class_%s__%s__%s' % (klass, field, 'SMI'),
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'value': '%s::%s' % (klass, offset)
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});
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#
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# Load field offset information from objects-inl.h.
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#
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def load_fields():
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inlfilename = sys.argv[3];
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inlfile = open(inlfilename, 'r');
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#
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# Each class's fields and the corresponding offsets are described in the
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# source by calls to macros like "ACCESSORS" (and friends). All we do
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# here is extract these macro invocations, taking into account that they
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# may span multiple lines and may contain nested parentheses. We also
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# call parse_field() to pick apart the invocation.
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#
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prefixes = [ 'ACCESSORS', 'ACCESSORS_GCSAFE', 'SMI_ACCESSORS' ];
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current = '';
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opens = 0;
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for line in inlfile:
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if (opens > 0):
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# Continuation line
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for ii in range(0, len(line)):
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if (line[ii] == '('):
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opens += 1;
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elif (line[ii] == ')'):
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opens -= 1;
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if (opens == 0):
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break;
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current += line[0:ii + 1];
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continue;
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for prefix in prefixes:
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if (not line.startswith(prefix + '(')):
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continue;
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if (len(current) > 0):
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fields.append(parse_field(current));
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current = '';
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for ii in range(len(prefix), len(line)):
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if (line[ii] == '('):
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opens += 1;
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elif (line[ii] == ')'):
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opens -= 1;
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if (opens == 0):
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break;
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current += line[0:ii + 1];
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if (len(current) > 0):
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fields.append(parse_field(current));
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current = '';
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for body in extras_accessors:
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fields.append(parse_field('ACCESSORS(%s)' % body));
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#
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# Emit a block of constants.
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#
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def emit_set(out, consts):
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for ii in range(0, len(consts)):
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out.write('int v8dbg_%s = %s;\n' %
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(consts[ii]['name'], consts[ii]['value']));
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out.write('\n');
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#
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# Emit the whole output file.
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#
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def emit_config():
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out = file(sys.argv[1], 'w');
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out.write(header);
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out.write('/* miscellaneous constants */\n');
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emit_set(out, consts_misc);
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out.write('/* class type information */\n');
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consts = [];
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keys = typeclasses.keys();
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keys.sort();
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for typename in keys:
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klass = typeclasses[typename];
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consts.append({
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'name': 'type_%s__%s' % (klass, typename),
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'value': typename
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});
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emit_set(out, consts);
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out.write('/* class hierarchy information */\n');
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consts = [];
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keys = klasses.keys();
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keys.sort();
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for klassname in keys:
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pklass = klasses[klassname]['parent'];
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if (pklass == None):
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continue;
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consts.append({
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'name': 'parent_%s__%s' % (klassname, pklass),
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'value': 0
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});
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emit_set(out, consts);
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out.write('/* field information */\n');
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emit_set(out, fields);
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out.write(footer);
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if (len(sys.argv) < 4):
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print('usage: %s output.cc objects.h objects-inl.h' % sys.argv[0]);
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sys.exit(2);
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load_objects();
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load_fields();
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emit_config();
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