config/check_macroassembler_style.py
author Eric Rahm <erahm@mozilla.com>
Thu, 10 Nov 2016 12:47:23 -0800
changeset 348770 e27050b02d69b88e19e0dcd151916f78259f9bb1
parent 306807 f64ec05d69a005cc76034ca608d573d7298b34bc
permissions -rw-r--r--
Bug 1313488 - Part 1: Convert XPCOM test TestDeadlockDetector to a gtest. r=froydnj This converts TestDeadlockDetector to a gtest. The logic for spawning off subprocesses is replaced with gtest's built-in death tests. On linux this will clone() the process and assert that the child process generates the appropriate assertion message. On OSX it will use fork(). In theory this should work on Windows as well buy spawning a new process but this test currently disabled there. MozReview-Commit-ID: 9Sl0hHBVGT3

# vim: set ts=8 sts=4 et sw=4 tw=99:
# 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/.

#----------------------------------------------------------------------------
# This script checks that SpiderMonkey MacroAssembler methods are properly
# annotated.
#
# The MacroAssembler has one interface for all platforms, but it might have one
# definition per platform. The code of the MacroAssembler use a macro to
# annotate the method declarations, in order to delete the function if it is not
# present on the current platform, and also to locate the files in which the
# methods are defined.
#
# This script scans the MacroAssembler.h header, for method declarations.
# It also scans MacroAssembler-/arch/.cpp, MacroAssembler-/arch/-inl.h, and
# MacroAssembler-inl.h for method definitions. The result of both scans are
# uniformized, and compared, to determine if the MacroAssembler.h header as
# proper methods annotations.
#----------------------------------------------------------------------------

from __future__ import print_function

import difflib
import os
import re
import subprocess
import sys
from check_utils import get_all_toplevel_filenames

architecture_independent = set([ 'generic' ])
all_architecture_names = set([ 'x86', 'x64', 'arm', 'arm64', 'mips32', 'mips64' ])
all_shared_architecture_names = set([ 'x86_shared', 'mips_shared', 'arm', 'arm64' ])

reBeforeArg = "(?<=[(,\s])"
reArgType = "(?P<type>[\w\s:*&]+)"
reArgName = "(?P<name>\s\w+)"
reArgDefault = "(?P<default>(?:\s=[^,)]+)?)"
reAfterArg = "(?=[,)])"
reMatchArg = re.compile(reBeforeArg + reArgType + reArgName + reArgDefault + reAfterArg)

def get_normalized_signatures(signature, fileAnnot = None):
    # Remove static
    signature = signature.replace('static', '')
    # Remove semicolon.
    signature = signature.replace(';', ' ')
    # Normalize spaces.
    signature = re.sub(r'\s+', ' ', signature).strip()
    # Match arguments, and keep only the type.
    signature = reMatchArg.sub('\g<type>', signature)
    # Remove class name
    signature = signature.replace('MacroAssembler::', '')

    # Extract list of architectures
    archs = ['generic']
    if fileAnnot:
        archs = [fileAnnot['arch']]

    if 'DEFINED_ON(' in signature:
        archs = re.sub(r'.*DEFINED_ON\((?P<archs>[^()]*)\).*', '\g<archs>', signature).split(',')
        archs = [a.strip() for a in archs]
        signature = re.sub(r'\s+DEFINED_ON\([^()]*\)', '', signature)

    elif 'PER_ARCH' in signature:
        archs = all_architecture_names
        signature = re.sub(r'\s+PER_ARCH', '', signature)

    elif 'PER_SHARED_ARCH' in signature:
        archs = all_shared_architecture_names
        signature = re.sub(r'\s+PER_SHARED_ARCH', '', signature)

    else:
        # No signature annotation, the list of architectures remains unchanged.
        pass

    # Extract inline annotation
    inline = False
    if fileAnnot:
        inline = fileAnnot['inline']

    if 'inline ' in signature:
        signature = re.sub(r'inline\s+', '', signature)
        inline = True

    inlinePrefx = ''
    if inline:
        inlinePrefx = 'inline '
    signatures =  [
        { 'arch': a, 'sig': inlinePrefx + signature }
        for a in archs
    ]

    return signatures

file_suffixes = set([
    a.replace('_', '-') for a in
    all_architecture_names.union(all_shared_architecture_names)
])
def get_file_annotation(filename):
    origFilename = filename
    filename = filename.split('/')[-1]

    inline = False
    if filename.endswith('.cpp'):
        filename = filename[:-len('.cpp')]
    elif filename.endswith('-inl.h'):
        inline = True
        filename = filename[:-len('-inl.h')]
    else:
        raise Exception('unknown file name', origFilename)

    arch = 'generic'
    for suffix in file_suffixes:
        if filename == 'MacroAssembler-' + suffix:
            arch = suffix
            break

    return {
        'inline': inline,
        'arch': arch.replace('-', '_')
    }

def get_macroassembler_definitions(filename):
    try:
        fileAnnot = get_file_annotation(filename)
    except:
        return []

    style_section = False
    code_section = False
    lines = ''
    signatures = []
    with open(os.path.join('../..', filename)) as f:
        for line in f:
            if '//{{{ check_macroassembler_style' in line:
                style_section = True
            elif '//}}} check_macroassembler_style' in line:
                style_section = False
            if not style_section:
                continue

            line = re.sub(r'//.*', '', line)
            if line.startswith('{'):
                if 'MacroAssembler::' in lines:
                    signatures.extend(get_normalized_signatures(lines, fileAnnot))
                code_section = True
                continue
            if line.startswith('}'):
                code_section = False
                lines = ''
                continue
            if code_section:
                continue

            if len(line.strip()) == 0:
                lines = ''
                continue
            lines = lines + line
            # Continue until we have a complete declaration
            if '{' not in lines:
                continue
            # Skip variable declarations
            if ')' not in lines:
                lines = ''
                continue

    return signatures

def get_macroassembler_declaration(filename):
    style_section = False
    lines = ''
    signatures = []
    with open(os.path.join('../..', filename)) as f:
        for line in f:
            if '//{{{ check_macroassembler_style' in line:
                style_section = True
            elif '//}}} check_macroassembler_style' in line:
                style_section = False
            if not style_section:
                continue

            line = re.sub(r'//.*', '', line)
            if len(line.strip()) == 0:
                lines = ''
                continue
            lines = lines + line
            # Continue until we have a complete declaration
            if ';' not in lines:
                continue
            # Skip variable declarations
            if ')' not in lines:
                lines = ''
                continue

            signatures.extend(get_normalized_signatures(lines))
            lines = ''

    return signatures

def append_signatures(d, sigs):
    for s in sigs:
        if s['sig'] not in d:
            d[s['sig']] = []
        d[s['sig']].append(s['arch']);
    return d

def generate_file_content(signatures):
    output = []
    for s in sorted(signatures.keys()):
        archs = set(sorted(signatures[s]))
        if len(archs.symmetric_difference(architecture_independent)) == 0:
            output.append(s + ';\n')
            if s.startswith('inline'):
                output.append('    is defined in MacroAssembler-inl.h\n')
            else:
                output.append('    is defined in MacroAssembler.cpp\n')
        else:
            if len(archs.symmetric_difference(all_architecture_names)) == 0:
                output.append(s + ' PER_ARCH;\n')
            elif len(archs.symmetric_difference(all_shared_architecture_names)) == 0:
                output.append(s + ' PER_SHARED_ARCH;\n')
            else:
                output.append(s + ' DEFINED_ON(' + ', '.join(archs) + ');\n')
            for a in archs:
                a = a.replace('_', '-')
                masm = '%s/MacroAssembler-%s' % (a, a)
                if s.startswith('inline'):
                    output.append('    is defined in %s-inl.h\n' % masm)
                else:
                    output.append('    is defined in %s.cpp\n' % masm)
    return output

def check_style():
    # We read from the header file the signature of each function.
    decls = dict()      # type: dict(signature => ['x86', 'x64'])

    # We infer from each file the signature of each MacroAssembler function.
    defs = dict()       # type: dict(signature => ['x86', 'x64'])

    # Select the appropriate files.
    for filename in get_all_toplevel_filenames():
        if not filename.startswith('js/src/jit/'):
            continue
        if 'MacroAssembler' not in filename:
            continue

        if filename.endswith('MacroAssembler.h'):
            decls = append_signatures(decls, get_macroassembler_declaration(filename))
        else:
            defs = append_signatures(defs, get_macroassembler_definitions(filename))

    # Compare declarations and definitions output.
    difflines = difflib.unified_diff(generate_file_content(decls),
                                     generate_file_content(defs),
                                     fromfile='check_macroassembler_style.py declared syntax',
                                     tofile='check_macroassembler_style.py found definitions')
    ok = True
    for diffline in difflines:
        ok = False
        print(diffline, end='')

    return ok


def main():
    ok = check_style()

    if ok:
        print('TEST-PASS | check_macroassembler_style.py | ok')
    else:
        print('TEST-UNEXPECTED-FAIL | check_macroassembler_style.py | actual output does not match expected output;  diff is above')

    sys.exit(0 if ok else 1)


if __name__ == '__main__':
    main()