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307e30c1eb
v8/tools/gen-postmortem-metadata.py
Leszek Swirski 31abbcfb4d [maglev] Use RegList for free registers 
Store the free registers as a RegList rather than stack of Register
values. This allows us to simplify some of the register freeing logic,
including passing the current free set to nodes for use as temporaries.

Drive-by: Replace ALWAYS_ALLOCATABLE_GENERAL_REGISTERS with
ALLOCATABLE_GENERAL_REGISTERS, which is the more general list (the former
is an implementation detail for optionally reserving a register for
the cage register).

Bug: v8:7700
Change-Id: I666e9a7547c2f4f4e578fbcbb4bd3fe3cb06dac5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3497767
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Auto-Submit: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79344}
2022-03-03 10:33:44 +00:00

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#!/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.
# * 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
# with the distribution.
# * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived
# from this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#
#
# Emits a C++ file to be compiled and linked into libv8 to support postmortem
# debugging tools. Most importantly, this tool emits constants describing V8
# internals:
#
# v8dbg_type_CLASS__TYPE = VALUE Describes class type values
# v8dbg_class_CLASS__FIELD__TYPE = OFFSET Describes class fields
# v8dbg_parent_CLASS__PARENT Describes class hierarchy
# v8dbg_frametype_NAME = VALUE Describes stack frame values
# v8dbg_off_fp_NAME = OFFSET Frame pointer offsets
# v8dbg_prop_NAME = OFFSET Object property offsets
# v8dbg_NAME = VALUE Miscellaneous values
#
# These constants are declared as global integers so that they'll be present in
# the generated libv8 binary.
#
# for py2/py3 compatibility
from __future__ import print_function
import io
import re
import sys
#
# Miscellaneous constants such as tags and masks used for object identification,
# enumeration values used as indexes in internal tables, etc..
#
consts_misc = [
{ 'name': 'FirstNonstringType', 'value': 'FIRST_NONSTRING_TYPE' },
{ 'name': 'APIObjectType', 'value': 'JS_API_OBJECT_TYPE' },
{ 'name': 'SpecialAPIObjectType', 'value': 'JS_SPECIAL_API_OBJECT_TYPE' },
{ 'name': 'FirstContextType', 'value': 'FIRST_CONTEXT_TYPE' },
{ 'name': 'LastContextType', 'value': 'LAST_CONTEXT_TYPE' },
{ 'name': 'IsNotStringMask', 'value': 'kIsNotStringMask' },
{ 'name': 'StringTag', 'value': 'kStringTag' },
{ 'name': 'StringEncodingMask', 'value': 'kStringEncodingMask' },
{ 'name': 'TwoByteStringTag', 'value': 'kTwoByteStringTag' },
{ 'name': 'OneByteStringTag', 'value': 'kOneByteStringTag' },
{ 'name': 'StringRepresentationMask',
'value': 'kStringRepresentationMask' },
{ 'name': 'SeqStringTag', 'value': 'kSeqStringTag' },
{ 'name': 'ConsStringTag', 'value': 'kConsStringTag' },
{ 'name': 'ExternalStringTag', 'value': 'kExternalStringTag' },
{ 'name': 'SlicedStringTag', 'value': 'kSlicedStringTag' },
{ 'name': 'ThinStringTag', 'value': 'kThinStringTag' },
{ 'name': 'HeapObjectTag', 'value': 'kHeapObjectTag' },
{ 'name': 'HeapObjectTagMask', 'value': 'kHeapObjectTagMask' },
{ 'name': 'SmiTag', 'value': 'kSmiTag' },
{ 'name': 'SmiTagMask', 'value': 'kSmiTagMask' },
{ 'name': 'SmiValueShift', 'value': 'kSmiTagSize' },
{ 'name': 'SmiShiftSize', 'value': 'kSmiShiftSize' },
{ 'name': 'SystemPointerSize', 'value': 'kSystemPointerSize' },
{ 'name': 'SystemPointerSizeLog2', 'value': 'kSystemPointerSizeLog2' },
{ 'name': 'TaggedSize', 'value': 'kTaggedSize' },
{ 'name': 'TaggedSizeLog2', 'value': 'kTaggedSizeLog2' },
{ 'name': 'CodeKindFieldMask', 'value': 'Code::KindField::kMask' },
{ 'name': 'CodeKindFieldShift', 'value': 'Code::KindField::kShift' },
{ 'name': 'CodeKindBytecodeHandler',
'value': 'static_cast<int>(CodeKind::BYTECODE_HANDLER)' },
{ 'name': 'CodeKindInterpretedFunction',
'value': 'static_cast<int>(CodeKind::INTERPRETED_FUNCTION)' },
{ 'name': 'CodeKindBaseline',
'value': 'static_cast<int>(CodeKind::BASELINE)' },
{ 'name': 'OddballFalse', 'value': 'Oddball::kFalse' },
{ 'name': 'OddballTrue', 'value': 'Oddball::kTrue' },
{ 'name': 'OddballTheHole', 'value': 'Oddball::kTheHole' },
{ 'name': 'OddballNull', 'value': 'Oddball::kNull' },
{ 'name': 'OddballArgumentsMarker', 'value': 'Oddball::kArgumentsMarker' },
{ 'name': 'OddballUndefined', 'value': 'Oddball::kUndefined' },
{ 'name': 'OddballUninitialized', 'value': 'Oddball::kUninitialized' },
{ 'name': 'OddballOther', 'value': 'Oddball::kOther' },
{ 'name': 'OddballException', 'value': 'Oddball::kException' },
{ 'name': 'ContextRegister', 'value': 'kContextRegister.code()' },
{ 'name': 'ReturnRegister0', 'value': 'kReturnRegister0.code()' },
{ 'name': 'JSFunctionRegister', 'value': 'kJSFunctionRegister.code()' },
{ 'name': 'InterpreterBytecodeOffsetRegister',
'value': 'kInterpreterBytecodeOffsetRegister.code()' },
{ 'name': 'InterpreterBytecodeArrayRegister',
'value': 'kInterpreterBytecodeArrayRegister.code()' },
{ 'name': 'RuntimeCallFunctionRegister',
'value': 'kRuntimeCallFunctionRegister.code()' },
{ 'name': 'prop_kind_Data',
'value': 'static_cast<int>(PropertyKind::kData)' },
{ 'name': 'prop_kind_Accessor',
'value': 'static_cast<int>(PropertyKind::kAccessor)' },
{ 'name': 'prop_kind_mask',
'value': 'PropertyDetails::KindField::kMask' },
{ 'name': 'prop_location_Descriptor',
'value': 'static_cast<int>(PropertyLocation::kDescriptor)' },
{ 'name': 'prop_location_Field',
'value': 'static_cast<int>(PropertyLocation::kField)' },
{ 'name': 'prop_location_mask',
'value': 'PropertyDetails::LocationField::kMask' },
{ 'name': 'prop_location_shift',
'value': 'PropertyDetails::LocationField::kShift' },
{ 'name': 'prop_attributes_NONE', 'value': 'NONE' },
{ 'name': 'prop_attributes_READ_ONLY', 'value': 'READ_ONLY' },
{ 'name': 'prop_attributes_DONT_ENUM', 'value': 'DONT_ENUM' },
{ 'name': 'prop_attributes_DONT_DELETE', 'value': 'DONT_DELETE' },
{ 'name': 'prop_attributes_mask',
'value': 'PropertyDetails::AttributesField::kMask' },
{ 'name': 'prop_attributes_shift',
'value': 'PropertyDetails::AttributesField::kShift' },
{ 'name': 'prop_index_mask',
'value': 'PropertyDetails::FieldIndexField::kMask' },
{ 'name': 'prop_index_shift',
'value': 'PropertyDetails::FieldIndexField::kShift' },
{ 'name': 'prop_representation_mask',
'value': 'PropertyDetails::RepresentationField::kMask' },
{ 'name': 'prop_representation_shift',
'value': 'PropertyDetails::RepresentationField::kShift' },
{ 'name': 'prop_representation_smi',
'value': 'Representation::Kind::kSmi' },
{ 'name': 'prop_representation_double',
'value': 'Representation::Kind::kDouble' },
{ 'name': 'prop_representation_heapobject',
'value': 'Representation::Kind::kHeapObject' },
{ 'name': 'prop_representation_tagged',
'value': 'Representation::Kind::kTagged' },
{ 'name': 'prop_desc_key',
'value': 'DescriptorArray::kEntryKeyIndex' },
{ 'name': 'prop_desc_details',
'value': 'DescriptorArray::kEntryDetailsIndex' },
{ 'name': 'prop_desc_value',
'value': 'DescriptorArray::kEntryValueIndex' },
{ 'name': 'prop_desc_size',
'value': 'DescriptorArray::kEntrySize' },
{ 'name': 'elements_fast_holey_elements',
'value': 'HOLEY_ELEMENTS' },
{ 'name': 'elements_fast_elements',
'value': 'PACKED_ELEMENTS' },
{ 'name': 'elements_dictionary_elements',
'value': 'DICTIONARY_ELEMENTS' },
{ 'name': 'bit_field2_elements_kind_mask',
'value': 'Map::Bits2::ElementsKindBits::kMask' },
{ 'name': 'bit_field2_elements_kind_shift',
'value': 'Map::Bits2::ElementsKindBits::kShift' },
{ 'name': 'bit_field3_is_dictionary_map_shift',
'value': 'Map::Bits3::IsDictionaryMapBit::kShift' },
{ 'name': 'bit_field3_number_of_own_descriptors_mask',
'value': 'Map::Bits3::NumberOfOwnDescriptorsBits::kMask' },
{ 'name': 'bit_field3_number_of_own_descriptors_shift',
'value': 'Map::Bits3::NumberOfOwnDescriptorsBits::kShift' },
{ 'name': 'class_Map__instance_descriptors_offset',
'value': 'Map::kInstanceDescriptorsOffset' },
{ 'name': 'off_fp_context_or_frame_type',
'value': 'CommonFrameConstants::kContextOrFrameTypeOffset'},
{ 'name': 'off_fp_context',
'value': 'StandardFrameConstants::kContextOffset' },
{ 'name': 'off_fp_constant_pool',
'value': 'StandardFrameConstants::kConstantPoolOffset' },
{ 'name': 'off_fp_function',
'value': 'StandardFrameConstants::kFunctionOffset' },
{ 'name': 'off_fp_args',
'value': 'StandardFrameConstants::kFixedFrameSizeAboveFp' },
{ 'name': 'off_fp_bytecode_array',
'value': 'UnoptimizedFrameConstants::kBytecodeArrayFromFp' },
{ 'name': 'off_fp_bytecode_offset',
'value': 'UnoptimizedFrameConstants::kBytecodeOffsetOrFeedbackVectorFromFp' },
{ 'name': 'scopeinfo_idx_nparams',
'value': 'ScopeInfo::kParameterCount' },
{ 'name': 'scopeinfo_idx_ncontextlocals',
'value': 'ScopeInfo::kContextLocalCount' },
{ 'name': 'scopeinfo_idx_first_vars',
'value': 'ScopeInfo::kVariablePartIndex' },
{ 'name': 'jsarray_buffer_was_detached_mask',
'value': 'JSArrayBuffer::WasDetachedBit::kMask' },
{ 'name': 'jsarray_buffer_was_detached_shift',
'value': 'JSArrayBuffer::WasDetachedBit::kShift' },
{ 'name': 'context_idx_scope_info',
'value': 'Context::SCOPE_INFO_INDEX' },
{ 'name': 'context_idx_prev',
'value': 'Context::PREVIOUS_INDEX' },
{ 'name': 'context_min_slots',
'value': 'Context::MIN_CONTEXT_SLOTS' },
{ 'name': 'native_context_embedder_data_offset',
'value': 'Internals::kNativeContextEmbedderDataOffset' },
{ 'name': 'namedictionaryshape_prefix_size',
'value': 'NameDictionaryShape::kPrefixSize' },
{ 'name': 'namedictionaryshape_entry_size',
'value': 'NameDictionaryShape::kEntrySize' },
{ 'name': 'globaldictionaryshape_entry_size',
'value': 'GlobalDictionaryShape::kEntrySize' },
{ 'name': 'namedictionary_prefix_start_index',
'value': 'NameDictionary::kPrefixStartIndex' },
{ 'name': 'numberdictionaryshape_prefix_size',
'value': 'NumberDictionaryShape::kPrefixSize' },
{ 'name': 'numberdictionaryshape_entry_size',
'value': 'NumberDictionaryShape::kEntrySize' },
{ 'name': 'simplenumberdictionaryshape_prefix_size',
'value': 'SimpleNumberDictionaryShape::kPrefixSize' },
{ 'name': 'simplenumberdictionaryshape_entry_size',
'value': 'SimpleNumberDictionaryShape::kEntrySize' },
{ 'name': 'type_JSError__JS_ERROR_TYPE', 'value': 'JS_ERROR_TYPE' },
];
#
# The following useful fields are missing accessors, so we define fake ones.
# Please note that extra accessors should _only_ be added to expose offsets that
# can be used to access actual V8 objects' properties. They should not be added
# for exposing other values. For instance, enumeration values or class'
# constants should be exposed by adding an entry in the "consts_misc" table, not
# in this "extras_accessors" table.
#
extras_accessors = [
'JSFunction, context, Context, kContextOffset',
'JSFunction, shared, SharedFunctionInfo, kSharedFunctionInfoOffset',
'HeapObject, map, Map, kMapOffset',
'JSObject, elements, Object, kElementsOffset',
'JSObject, internal_fields, uintptr_t, kHeaderSize',
'FixedArray, data, uintptr_t, kHeaderSize',
'BytecodeArray, data, uintptr_t, kHeaderSize',
'JSArrayBuffer, backing_store, uintptr_t, kBackingStoreOffset',
'JSArrayBuffer, byte_length, size_t, kByteLengthOffset',
'JSArrayBufferView, byte_length, size_t, kByteLengthOffset',
'JSArrayBufferView, byte_offset, size_t, kByteOffsetOffset',
'JSDate, value, Object, kValueOffset',
'JSRegExp, source, Object, kSourceOffset',
'JSTypedArray, external_pointer, uintptr_t, kExternalPointerOffset',
'JSTypedArray, length, Object, kLengthOffset',
'Map, instance_size_in_words, char, kInstanceSizeInWordsOffset',
'Map, inobject_properties_start_or_constructor_function_index, char, kInobjectPropertiesStartOrConstructorFunctionIndexOffset',
'Map, instance_type, uint16_t, kInstanceTypeOffset',
'Map, bit_field, char, kBitFieldOffset',
'Map, bit_field2, char, kBitField2Offset',
'Map, bit_field3, int, kBitField3Offset',
'Map, prototype, Object, kPrototypeOffset',
'Oddball, kind_offset, int, kKindOffset',
'HeapNumber, value, double, kValueOffset',
'ExternalString, resource, Object, kResourceOffset',
'SeqOneByteString, chars, char, kHeaderSize',
'SeqTwoByteString, chars, char, kHeaderSize',
'UncompiledData, inferred_name, String, kInferredNameOffset',
'UncompiledData, start_position, int32_t, kStartPositionOffset',
'UncompiledData, end_position, int32_t, kEndPositionOffset',
'Script, source, Object, kSourceOffset',
'Script, name, Object, kNameOffset',
'Script, line_ends, Object, kLineEndsOffset',
'SharedFunctionInfo, raw_function_token_offset, int16_t, kFunctionTokenOffsetOffset',
'SharedFunctionInfo, internal_formal_parameter_count, uint16_t, kFormalParameterCountOffset',
'SharedFunctionInfo, flags, int, kFlagsOffset',
'SharedFunctionInfo, length, uint16_t, kLengthOffset',
'SlicedString, parent, String, kParentOffset',
'Code, flags, uint32_t, kFlagsOffset',
'Code, instruction_start, uintptr_t, kHeaderSize',
'Code, instruction_size, int, kInstructionSizeOffset',
'String, length, int32_t, kLengthOffset',
'DescriptorArray, header_size, uintptr_t, kHeaderSize',
'ConsString, first, String, kFirstOffset',
'ConsString, second, String, kSecondOffset',
'SlicedString, offset, SMI, kOffsetOffset',
'ThinString, actual, String, kActualOffset',
'Symbol, name, Object, kDescriptionOffset',
'FixedArrayBase, length, SMI, kLengthOffset',
];
#
# The following is a whitelist of classes we expect to find when scanning the
# source code. This list is not exhaustive, but it's still useful to identify
# when this script gets out of sync with the source. See load_objects().
#
expected_classes = [
'ConsString', 'FixedArray', 'HeapNumber', 'JSArray', 'JSFunction',
'JSObject', 'JSRegExp', 'JSPrimitiveWrapper', 'Map', 'Oddball', 'Script',
'SeqOneByteString', 'SharedFunctionInfo', 'ScopeInfo', 'JSPromise',
'DescriptorArray'
];
#
# The following structures store high-level representations of the structures
# for which we're going to emit descriptive constants.
#
types = {}; # set of all type names
typeclasses = {}; # maps type names to corresponding class names
klasses = {}; # known classes, including parents
fields = []; # field declarations
header = '''
/*
* This file is generated by %s. Do not edit directly.
*/
#include "src/init/v8.h"
#include "src/codegen/register.h"
#include "src/execution/frames.h"
#include "src/execution/frames-inl.h" /* for architecture-specific frame constants */
#include "src/objects/contexts.h"
#include "src/objects/objects.h"
#include "src/objects/data-handler.h"
#include "src/objects/js-promise.h"
#include "src/objects/js-regexp-string-iterator.h"
namespace v8 {
namespace internal {
extern "C" {
/* stack frame constants */
#define FRAME_CONST(value, klass) \
V8_EXPORT int v8dbg_frametype_##klass = StackFrame::value;
STACK_FRAME_TYPE_LIST(FRAME_CONST)
#undef FRAME_CONST
''' % sys.argv[0]
footer = '''
}
}
}
'''
#
# Get the base class
#
def get_base_class(klass):
if (klass == 'Object'):
return klass;
if (not (klass in klasses)):
return None;
k = klasses[klass];
return get_base_class(k['parent']);
#
# Loads class hierarchy and type information from "objects.h" etc.
#
def load_objects():
#
# Construct a dictionary for the classes we're sure should be present.
#
checktypes = {};
for klass in expected_classes:
checktypes[klass] = True;
for filename in sys.argv[2:]:
if not filename.endswith("-inl.h"):
load_objects_from_file(filename, checktypes)
if (len(checktypes) > 0):
for klass in checktypes:
print('error: expected class \"%s\" not found' % klass);
sys.exit(1);
def load_objects_from_file(objfilename, checktypes):
objfile = io.open(objfilename, 'r', encoding='utf-8');
in_insttype = False;
in_torque_insttype = False
in_torque_fulldef = False
typestr = '';
torque_typestr = ''
torque_fulldefstr = ''
uncommented_file = ''
#
# Iterate the header file line-by-line to collect type and class
# information. For types, we accumulate a string representing the entire
# InstanceType enum definition and parse it later because it's easier to
# do so without the embedded newlines.
#
for line in objfile:
if (line.startswith('enum InstanceType : uint16_t {')):
in_insttype = True;
continue;
if (line.startswith('#define TORQUE_ASSIGNED_INSTANCE_TYPE_LIST')):
in_torque_insttype = True
continue
if (line.startswith('#define TORQUE_INSTANCE_CHECKERS_SINGLE_FULLY_DEFINED')):
in_torque_fulldef = True
continue
if (in_insttype and line.startswith('};')):
in_insttype = False;
continue;
if (in_torque_insttype and (not line or line.isspace())):
in_torque_insttype = False
continue
if (in_torque_fulldef and (not line or line.isspace())):
in_torque_fulldef = False
continue
pre = line.strip()
line = re.sub('// .*', '', line.strip());
if (in_insttype):
typestr += line;
continue;
if (in_torque_insttype):
torque_typestr += line
continue
if (in_torque_fulldef):
torque_fulldefstr += line
continue
uncommented_file += '\n' + line
for match in re.finditer(r'\nclass(?:\s+V8_EXPORT(?:_PRIVATE)?)?'
r'\s+(\w[^:;]*)'
r'(?:: public (\w[^{]*))?\s*{\s*',
uncommented_file):
klass = match.group(1).strip();
pklass = match.group(2);
if (pklass):
# Check for generated Torque class.
gen_match = re.match(
r'TorqueGenerated\w+\s*<\s*\w+,\s*(\w+)\s*>',
pklass)
if (gen_match):
pklass = gen_match.group(1)
# Strip potential template arguments from parent
# class.
match = re.match(r'(\w+)(<.*>)?', pklass.strip());
pklass = match.group(1).strip();
klasses[klass] = { 'parent': pklass };
#
# Process the instance type declaration.
#
entries = typestr.split(',');
for entry in entries:
types[re.sub('\s*=.*', '', entry).lstrip()] = True;
entries = torque_typestr.split('\\')
for entry in entries:
name = re.sub(r' *V\(|\).*', '', entry)
types[name] = True
entries = torque_fulldefstr.split('\\')
for entry in entries:
entry = entry.strip()
if not entry:
continue
start = entry.find('(');
end = entry.find(')', start);
rest = entry[start + 1: end];
args = re.split('\s*,\s*', rest);
typename = args[0]
typeconst = args[1]
types[typeconst] = True
typeclasses[typeconst] = typename
#
# Infer class names for each type based on a systematic transformation.
# For example, "JS_FUNCTION_TYPE" becomes "JSFunction". We find the
# class for each type rather than the other way around because there are
# fewer cases where one type maps to more than one class than the other
# way around.
#
for type in types:
usetype = type
#
# Remove the "_TYPE" suffix and then convert to camel case,
# except that a "JS" prefix remains uppercase (as in
# "JS_FUNCTION_TYPE" => "JSFunction").
#
if (not usetype.endswith('_TYPE')):
continue;
usetype = usetype[0:len(usetype) - len('_TYPE')];
parts = usetype.split('_');
cctype = '';
if (parts[0] == 'JS'):
cctype = 'JS';
start = 1;
else:
cctype = '';
start = 0;
for ii in range(start, len(parts)):
part = parts[ii];
cctype += part[0].upper() + part[1:].lower();
#
# Mapping string types is more complicated. Both types and
# class names for Strings specify a representation (e.g., Seq,
# Cons, External, or Sliced) and an encoding (TwoByte/OneByte),
# In the simplest case, both of these are explicit in both
# names, as in:
#
# EXTERNAL_ONE_BYTE_STRING_TYPE => ExternalOneByteString
#
# However, either the representation or encoding can be omitted
# from the type name, in which case "Seq" and "TwoByte" are
# assumed, as in:
#
# STRING_TYPE => SeqTwoByteString
#
# Additionally, sometimes the type name has more information
# than the class, as in:
#
# CONS_ONE_BYTE_STRING_TYPE => ConsString
#
# To figure this out dynamically, we first check for a
# representation and encoding and add them if they're not
# present. If that doesn't yield a valid class name, then we
# strip out the representation.
#
if (cctype.endswith('String')):
if (cctype.find('Cons') == -1 and
cctype.find('External') == -1 and
cctype.find('Sliced') == -1):
if (cctype.find('OneByte') != -1):
cctype = re.sub('OneByteString$',
'SeqOneByteString', cctype);
else:
cctype = re.sub('String$',
'SeqString', cctype);
if (cctype.find('OneByte') == -1):
cctype = re.sub('String$', 'TwoByteString',
cctype);
if (not (cctype in klasses)):
cctype = re.sub('OneByte', '', cctype);
cctype = re.sub('TwoByte', '', cctype);
#
# Despite all that, some types have no corresponding class.
#
if (cctype in klasses):
typeclasses[type] = cctype;
if (cctype in checktypes):
del checktypes[cctype];
#
# For a given macro call, pick apart the arguments and return an object
# describing the corresponding output constant. See load_fields().
#
def parse_field(call):
# Replace newlines with spaces.
for ii in range(0, len(call)):
if (call[ii] == '\n'):
call[ii] == ' ';
idx = call.find('(');
kind = call[0:idx];
rest = call[idx + 1: len(call) - 1];
args = re.split('\s*,\s*', rest);
consts = [];
klass = args[0];
field = args[1];
dtype = None
offset = None
if kind.startswith('WEAK_ACCESSORS'):
dtype = 'weak'
offset = args[2];
elif not (kind.startswith('SMI_ACCESSORS') or kind.startswith('ACCESSORS_TO_SMI')):
dtype = args[2].replace('<', '_').replace('>', '_')
offset = args[3];
else:
offset = args[2];
dtype = 'SMI'
assert(offset is not None and dtype is not None);
return ({
'name': 'class_%s__%s__%s' % (klass, field, dtype),
'value': '%s::%s' % (klass, offset)
});
#
# Load field offset information from objects-inl.h etc.
#
def load_fields():
for filename in sys.argv[2:]:
if filename.endswith("-inl.h"):
load_fields_from_file(filename)
for body in extras_accessors:
fields.append(parse_field('ACCESSORS(%s)' % body));
def load_fields_from_file(filename):
inlfile = io.open(filename, 'r', encoding='utf-8');
#
# Each class's fields and the corresponding offsets are described in the
# source by calls to macros like "ACCESSORS" (and friends). All we do
# here is extract these macro invocations, taking into account that they
# may span multiple lines and may contain nested parentheses. We also
# call parse_field() to pick apart the invocation.
#
prefixes = [ 'ACCESSORS', 'ACCESSORS2', 'ACCESSORS_GCSAFE',
'SMI_ACCESSORS', 'ACCESSORS_TO_SMI',
'RELEASE_ACQUIRE_ACCESSORS', 'WEAK_ACCESSORS' ];
prefixes += ([ prefix + "_CHECKED" for prefix in prefixes ] +
[ prefix + "_CHECKED2" for prefix in prefixes ])
current = '';
opens = 0;
for line in inlfile:
if (opens > 0):
# Continuation line
for ii in range(0, len(line)):
if (line[ii] == '('):
opens += 1;
elif (line[ii] == ')'):
opens -= 1;
if (opens == 0):
break;
current += line[0:ii + 1];
continue;
for prefix in prefixes:
if (not line.startswith(prefix + '(')):
continue;
if (len(current) > 0):
fields.append(parse_field(current));
current = '';
for ii in range(len(prefix), len(line)):
if (line[ii] == '('):
opens += 1;
elif (line[ii] == ')'):
opens -= 1;
if (opens == 0):
break;
current += line[0:ii + 1];
if (len(current) > 0):
fields.append(parse_field(current));
current = '';
#
# Emit a block of constants.
#
def emit_set(out, consts):
lines = set() # To remove duplicates.
# Fix up overzealous parses. This could be done inside the
# parsers but as there are several, it's easiest to do it here.
ws = re.compile('\s+')
for const in consts:
name = ws.sub('', const['name'])
value = ws.sub('', str(const['value'])) # Can be a number.
lines.add('V8_EXPORT int v8dbg_%s = %s;\n' % (name, value))
for line in lines:
out.write(line);
out.write('\n');
#
# Emit the whole output file.
#
def emit_config():
out = open(sys.argv[1], 'w');
out.write(header);
out.write('/* miscellaneous constants */\n');
emit_set(out, consts_misc);
out.write('/* class type information */\n');
consts = [];
for typename in sorted(typeclasses):
klass = typeclasses[typename];
consts.append({
'name': 'type_%s__%s' % (klass, typename),
'value': typename
});
emit_set(out, consts);
out.write('/* class hierarchy information */\n');
consts = [];
for klassname in sorted(klasses):
pklass = klasses[klassname]['parent'];
bklass = get_base_class(klassname);
if (bklass != 'Object'):
continue;
if (pklass == None):
continue;
consts.append({
'name': 'parent_%s__%s' % (klassname, pklass),
'value': 0
});
emit_set(out, consts);
out.write('/* field information */\n');
emit_set(out, fields);
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();
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