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regen_atoms.py
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regen_atoms.py
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#!/usr/bin/env python
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
import re
import os
import sys
from io import BytesIO
GECKO_DIR = os.path.dirname(__file__.replace('\\', '/'))
sys.path.insert(0, os.path.join(os.path.dirname(GECKO_DIR), "properties"))
import build
PRELUDE = """
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* Autogenerated file created by components/style/gecko/binding_tools/regen_atoms.py, DO NOT EDIT DIRECTLY */
"""[1:] # NOQA: E501
def gnu_symbolify(source, ident):
return "_ZN{}{}{}{}E".format(len(source.CLASS), source.CLASS, len(ident), ident)
def msvc64_symbolify(source, ident):
return "?{}@{}@@2PEAV{}@@EA".format(ident, source.CLASS, source.TYPE)
def msvc32_symbolify(source, ident):
# Prepend "\x01" to avoid LLVM prefixing the mangled name with "_".
# See https://github.com/rust-lang/rust/issues/36097
return "\\x01?{}@{}@@2PAV{}@@A".format(ident, source.CLASS, source.TYPE)
class GkAtomSource:
PATTERN = re.compile('^(GK_ATOM)\(([^,]*),[^"]*"([^"]*)",\s*([^)]*)\)',
re.MULTILINE)
FILE = "include/nsGkAtomList.h"
CLASS = "nsGkAtoms"
TYPE = "nsStaticAtom"
class CSSPseudoElementsAtomSource:
PATTERN = re.compile('^(CSS_PSEUDO_ELEMENT)\(([^,]*),[^"]*"([^"]*)",()',
re.MULTILINE)
FILE = "include/nsCSSPseudoElementList.h"
CLASS = "nsCSSPseudoElements"
# NB: nsICSSPseudoElement is effectively the same as a nsStaticAtom, but we need
# this for MSVC name mangling.
TYPE = "nsICSSPseudoElement"
class CSSAnonBoxesAtomSource:
PATTERN = re.compile('^(CSS_ANON_BOX|CSS_NON_INHERITING_ANON_BOX|CSS_WRAPPER_ANON_BOX)\(([^,]*),[^"]*"([^"]*)"()\)', # NOQA: E501
re.MULTILINE)
FILE = "include/nsCSSAnonBoxList.h"
CLASS = "nsCSSAnonBoxes"
TYPE = "nsICSSAnonBoxPseudo"
SOURCES = [
GkAtomSource,
CSSPseudoElementsAtomSource,
CSSAnonBoxesAtomSource,
]
def map_atom(ident):
if ident in {"box", "loop", "match", "mod", "ref",
"self", "type", "use", "where", "in"}:
return ident + "_"
return ident
class Atom:
def __init__(self, source, macro_name, ident, value, ty):
self.ident = "{}_{}".format(source.CLASS, ident)
self.original_ident = ident
self.value = value
self.source = source
self.macro = macro_name
self.ty = ty
if self.is_anon_box():
assert self.is_inheriting_anon_box() or self.is_non_inheriting_anon_box()
def cpp_class(self):
return self.source.CLASS
def gnu_symbol(self):
return gnu_symbolify(self.source, self.original_ident)
def msvc32_symbol(self):
return msvc32_symbolify(self.source, self.original_ident)
def msvc64_symbol(self):
return msvc64_symbolify(self.source, self.original_ident)
def type(self):
return self.ty
def capitalized(self):
return self.original_ident[0].upper() + self.original_ident[1:]
def is_anon_box(self):
return self.type() == "nsICSSAnonBoxPseudo"
def is_non_inheriting_anon_box(self):
return self.macro == "CSS_NON_INHERITING_ANON_BOX"
def is_inheriting_anon_box(self):
return (self.macro == "CSS_ANON_BOX" or
self.macro == "CSS_WRAPPER_ANON_BOX")
def is_tree_pseudo_element(self):
return self.value.startswith(":-moz-tree-")
def collect_atoms(objdir):
atoms = []
for source in SOURCES:
path = os.path.abspath(os.path.join(objdir, source.FILE))
print("cargo:rerun-if-changed={}".format(path))
with open(path) as f:
content = f.read()
for result in source.PATTERN.finditer(content):
ty = result.group(4) or source.TYPE
atoms.append(Atom(source, result.group(1), result.group(2), result.group(3), ty))
return atoms
class FileAvoidWrite(BytesIO):
"""File-like object that buffers output and only writes if content changed."""
def __init__(self, filename):
BytesIO.__init__(self)
self.name = filename
def write(self, buf):
if isinstance(buf, unicode):
buf = buf.encode('utf-8')
BytesIO.write(self, buf)
def close(self):
buf = self.getvalue()
BytesIO.close(self)
try:
with open(self.name, 'rb') as f:
old_content = f.read()
if old_content == buf:
print("{} is not changed, skip".format(self.name))
return
except IOError:
pass
with open(self.name, 'wb') as f:
f.write(buf)
def __enter__(self):
return self
def __exit__(self, type, value, traceback):
if not self.closed:
self.close()
IMPORTS = ("\nuse gecko_bindings::structs::nsStaticAtom;"
"\nuse string_cache::Atom;\n\n")
ATOM_TEMPLATE = (" #[link_name = \"{link_name}\"]\n"
" pub static {name}: *mut {type};")
UNSAFE_STATIC = ("#[inline(always)]\n"
"pub unsafe fn atom_from_static(ptr: *mut nsStaticAtom) -> Atom {\n"
" Atom::from_static(ptr)\n"
"}\n\n")
CFG_IF = '''
cfg_if! {{
if #[cfg(not(target_env = "msvc"))] {{
extern {{
{gnu}
}}
}} else if #[cfg(target_pointer_width = "64")] {{
extern {{
{msvc64}
}}
}} else {{
extern {{
{msvc32}
}}
}}
}}
'''
RULE_TEMPLATE = ('("{atom}") =>\n '
'{{{{ '
'#[allow(unsafe_code)] #[allow(unused_unsafe)]'
'unsafe {{ $crate::string_cache::atom_macro::atom_from_static'
'($crate::string_cache::atom_macro::{name} as *mut _) }}'
' }}}};')
MACRO = '''
#[macro_export]
macro_rules! atom {{
{}
}}
'''
def write_atom_macro(atoms, file_name):
def get_symbols(func):
return '\n'.join([ATOM_TEMPLATE.format(name=atom.ident,
link_name=func(atom),
type=atom.type()) for atom in atoms])
with FileAvoidWrite(file_name) as f:
f.write(PRELUDE)
f.write(IMPORTS)
for ty in sorted(set([atom.type() for atom in atoms])):
if ty != "nsStaticAtom":
f.write("pub enum {} {{}}\n\n".format(ty))
f.write(UNSAFE_STATIC)
gnu_symbols = get_symbols(Atom.gnu_symbol)
msvc32_symbols = get_symbols(Atom.msvc32_symbol)
msvc64_symbols = get_symbols(Atom.msvc64_symbol)
f.write(CFG_IF.format(gnu=gnu_symbols, msvc32=msvc32_symbols, msvc64=msvc64_symbols))
macro_rules = [RULE_TEMPLATE.format(atom=atom.value, name=atom.ident) for atom in atoms]
f.write(MACRO.format('\n'.join(macro_rules)))
def write_pseudo_elements(atoms, target_filename):
pseudos = []
for atom in atoms:
if atom.type() == "nsICSSPseudoElement" or atom.type() == "nsICSSAnonBoxPseudo":
pseudos.append(atom)
pseudo_definition_template = os.path.join(GECKO_DIR, "pseudo_element_definition.mako.rs")
print("cargo:rerun-if-changed={}".format(pseudo_definition_template))
contents = build.render(pseudo_definition_template, PSEUDOS=pseudos)
with FileAvoidWrite(target_filename) as f:
f.write(contents)
def generate_atoms(dist, out):
atoms = collect_atoms(dist)
write_atom_macro(atoms, os.path.join(out, "atom_macro.rs"))
write_pseudo_elements(atoms, os.path.join(out, "pseudo_element_definition.rs"))
if __name__ == "__main__":
if len(sys.argv) != 3:
print("Usage: {} dist out".format(sys.argv[0]))
exit(2)
generate_atoms(sys.argv[1], sys.argv[2])