emscripten/emscripten.py

231 строка
7.8 KiB
Python
Исходник Обычный вид История

#!/usr/bin/python
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import json
import optparse
import os
import subprocess
import sys
import tempfile
from tools import shared
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# Temporary files that should be deleted once the program is finished.
TEMP_FILES_TO_CLEAN = []
# The data layout used by llvm-gcc (as opposed to clang, which doesn't have the
# f128:128:128 part).
GCC_DATA_LAYOUT = ('target datalayout = "e-p:32:32:32-i1:8:8-i8:8:8-i16:16:16'
'-i32:32:32-i64:32:64-f32:32:32-f64:32:64-v64:64:64'
'-v128:128:128-a0:0:64-f80:32:32-f128:128:128-n8:16:32"')
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def path_from_root(*target):
"""Returns the absolute path to the target from the emscripten root."""
abspath = os.path.abspath(os.path.dirname(__file__))
return os.path.join(os.path.sep, *(abspath.split(os.sep) + list(target)))
def get_temp_file(suffix):
"""Returns a named temp file with the given prefix."""
named_file = tempfile.NamedTemporaryFile(
dir=shared.TEMP_DIR, suffix=suffix, delete=False)
TEMP_FILES_TO_CLEAN.append(named_file.name)
return named_file
def assemble(filepath):
"""Converts human-readable LLVM assembly to binary LLVM bitcode.
Args:
filepath: The path to the file to assemble. If the name ends with ".bc", the
file is assumed to be in bitcode format already.
Returns:
The path to the assembled file.
"""
if not filepath.endswith('.bc'):
command = [shared.LLVM_AS, '-o=-', filepath]
with get_temp_file('.bc') as out: ret = subprocess.call(command, stdout=out)
if ret != 0: raise RuntimeError('Could not assemble %s.' % filepath)
filepath = out.name
return filepath
def disassemble(filepath):
"""Converts binary LLVM bitcode to human-readable LLVM assembly.
Args:
filepath: The path to the file to disassemble. If the name ends with ".ll",
the file is assumed to be in human-readable assembly format already.
Returns:
The path to the disassembled file.
"""
if not filepath.endswith('.ll'):
command = [shared.LLVM_DIS, '-o=-', filepath] + shared.LLVM_DIS_OPTS
with get_temp_file('.ll') as out: ret = subprocess.call(command, stdout=out)
if ret != 0: raise RuntimeError('Could not disassemble %s.' % filepath)
filepath = out.name
return filepath
def optimize(filepath):
"""Runs LLVM's optimization passes on a given bitcode file.
Args:
filepath: The path to the bitcode file to optimize.
Returns:
The path to the optimized file.
"""
command = [shared.LLVM_OPT, '-o=-', filepath] + shared.pick_llvm_opts(3, True)
with get_temp_file('.bc') as out: ret = subprocess.call(command, stdout=out)
if ret != 0: raise RuntimeError('Could not optimize %s.' % filepath)
return out.name
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def link(*objects):
"""Links multiple LLVM bitcode files into a single file.
Args:
objects: The bitcode files to link.
Returns:
The path to the linked file.
"""
command = [shared.LLVM_LINK] + list(objects)
with get_temp_file('.bc') as out: ret = subprocess.call(command, stdout=out)
if ret != 0: raise RuntimeError('Could not link %s.' % objects)
return out.name
def compile_malloc(compiler):
"""Compiles dlmalloc to LLVM bitcode.
Args:
compiler: The compiler command to use, a path to either clang or llvm-gcc.
Returns:
The path to the compiled dlmalloc as an LLVM bitcode (.bc) file.
"""
src = path_from_root('src', 'dlmalloc.c')
includes = '-I' + path_from_root('src', 'include')
command = [compiler, '-c', '-g', '-emit-llvm', '-m32', '-o-', includes, src]
with get_temp_file('.bc') as out: ret = subprocess.call(command, stdout=out)
if ret != 0: raise RuntimeError('Could not compile dlmalloc.')
return out.name
def determine_compiler(filepath):
"""Determines whether a given file uses llvm-gcc or clang data layout.
Args:
filepath: The .bc or .ll file containing the bitcode/assembly to test.
Returns:
The path to the compiler, either llvm-gcc or clang.
"""
assembly = open(disassemble(filepath)).read()
is_gcc = GCC_DATA_LAYOUT in assembly
return shared.to_cc(shared.LLVM_GCC if is_gcc else shared.CLANG)
def has_annotations(filepath):
"""Tests whether an assembly file contains annotations.
Args:
filepath: The .ll file containing the assembly to check.
Returns:
Whether the provided file is valid assembly and has annotations.
"""
return filepath.endswith('.ll') and '[#uses=' in open(filepath).read()
def emscript(infile, settings, outfile):
"""Runs the emscripten LLVM-to-JS compiler.
Args:
infile: The path to the input LLVM assembly file.
settings: JSON-formatted string of settings that overrides the values
defined in src/settings.js.
outfile: The file where the output is written.
"""
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settings_file = get_temp_file('.txt').name # Save settings to a file to work around v8 issue 1579
s = open(settings_file, 'w')
s.write(settings)
s.close()
compiler = path_from_root('src', 'compiler.js')
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shared.run_js(shared.COMPILER_ENGINE, compiler, [settings_file, infile], stdout=outfile, stderr=subprocess.STDOUT, cwd=path_from_root('src'))
outfile.close()
def main(args):
# Construct a final linked and disassembled file.
if args.dlmalloc or args.optimize or not has_annotations(args.infile):
args.infile = assemble(args.infile)
if args.dlmalloc:
malloc = compile_malloc(determine_compiler(args.infile))
args.infile = link(args.infile, malloc)
if args.optimize: args.infile = optimize(args.infile)
args.infile = disassemble(args.infile)
# Prepare settings for serialization to JSON.
settings = {}
for setting in args.settings:
name, value = setting.strip().split('=', 1)
settings[name] = json.loads(value)
# Adjust sign correction for dlmalloc.
if args.dlmalloc:
CORRECT_SIGNS = settings.get('CORRECT_SIGNS', 0)
if CORRECT_SIGNS in (0, 2):
path = path_from_root('src', 'dlmalloc.c')
old_lines = settings.get('CORRECT_SIGNS_LINES', [])
line_nums = [4816, 4191, 4246, 4199, 4205, 4235, 4227]
lines = old_lines + [path + ':' + str(i) for i in line_nums]
settings['CORRECT_SIGNS'] = 2
settings['CORRECT_SIGNS_LINES'] = lines
# Compile the assembly to Javascript.
emscript(args.infile, json.dumps(settings), args.outfile)
if __name__ == '__main__':
parser = optparse.OptionParser(
usage='usage: %prog [-h] [-O] [-m] [-o OUTFILE] [-s FOO=BAR]* infile',
description=('Compile an LLVM assembly file to Javascript. Accepts both '
'human-readable (*.ll) and bitcode (*.bc) formats.'),
epilog='You should have an ~/.emscripten file set up; see settings.py.')
parser.add_option('-O', '--optimize',
default=False,
action='store_true',
help='Run LLVM optimizations on the input.')
parser.add_option('-m', '--dlmalloc',
default=False,
action='store_true',
help='Use dlmalloc. Without, uses a dummy allocator.')
parser.add_option('-o', '--outfile',
default=sys.stdout,
help='Where to write the output; defaults to stdout.')
parser.add_option('-s', '--setting',
dest='settings',
default=[],
action='append',
metavar='FOO=BAR',
help=('Overrides for settings defined in settings.js. '
'May occur multiple times.'))
# Convert to the same format that argparse would have produced.
keywords, positional = parser.parse_args()
if len(positional) != 1:
raise RuntimeError('Must provide exactly one positional argument.')
keywords.infile = os.path.abspath(positional[0])
if isinstance(keywords.outfile, basestring):
keywords.outfile = open(keywords.outfile, 'w')
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try:
main(keywords)
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finally:
for filename in TEMP_FILES_TO_CLEAN:
os.unlink(filename)