mirror of
https://github.com/fluencelabs/musl
synced 2025-05-09 13:52:22 +00:00
14ffeeb5bb
In particular we need to keep the generated headers around so they can be installed later. This behavior mimics more closely what the musl Makefile does now that it supports out-of-tree building (i.e. it puts all the generated files under obj)
267 lines
9.1 KiB
Python
Executable File
267 lines
9.1 KiB
Python
Executable File
#! /usr/bin/env python
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# Copyright 2016 WebAssembly Community Group participants
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import argparse
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import glob
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import itertools
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import multiprocessing
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import os
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import shutil
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import subprocess
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import sys
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import tempfile
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verbose = False
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DIR_BLACKLIST = ['misc', 'ldso']
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BLACKLIST = [
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'puts.c', # Prefer the JS version for now
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'abort.c', # Perfer the JS version for now
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'_Exit.c', # Perfer the JS version for now
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'__init_tls.c',
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]
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# Files that contain weak reference which are not suppoered by s2wasm
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WEAK_BLACKLIST = [
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'exit.c',
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'__libc_start_main.c',
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]
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CFLAGS = ['-std=c99',
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'-D_XOPEN_SOURCE=700',
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'-Werror',
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'-Wno-empty-body',
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'-Wno-incompatible-library-redeclaration',
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'-Wno-shift-op-parentheses',
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'-Wno-tautological-unsigned-zero-compare',
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'-Wno-tautological-constant-out-of-range-compare',
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'-Wno-tautological-unsigned-enum-zero-compare',
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'-Wno-ignored-attributes',
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'-Wno-format',
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'-Wno-bitwise-op-parentheses',
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'-Wno-logical-op-parentheses',
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'-Wno-string-plus-int',
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'-Wno-pointer-sign',
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'-Wno-dangling-else',
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'-Wno-absolute-value',
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'-Wno-parentheses',
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'-Wno-unknown-pragmas']
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def check_output(cmd, **kwargs):
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cwd = kwargs.get('cwd', os.getcwd())
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if verbose:
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c = ' '.join('"' + c + '"' if ' ' in c else c for c in cmd)
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print ' `%s`, cwd=`%s`' % (c, cwd)
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return subprocess.check_output(cmd, cwd=cwd)
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def change_extension(path, new_extension):
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return path[:path.rfind('.')] + new_extension
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def create_version(musl, outdir):
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"""musl's Makefile creates version.h"""
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script = os.path.join(musl, 'tools', 'version.sh')
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version = check_output(['sh', script], cwd=musl).strip()
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outroot = os.path.join(outdir, 'src', 'internal')
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if not os.path.exists(outroot):
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os.makedirs(outroot)
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with open(os.path.join(outroot, 'version.h'), 'w') as v:
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v.write('#define VERSION "%s"\n' % version)
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def build_headers(musl, arch, outdir):
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"""Emulate musl's Makefile build of alltypes.h and syscall.h"""
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outroot = os.path.join(outdir, 'include', 'bits')
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if not os.path.exists(outroot):
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os.makedirs(outroot)
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mkalltypes = os.path.join(musl, 'tools', 'mkalltypes.sed')
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inbits = os.path.join(musl, 'arch', arch, 'bits', 'alltypes.h.in')
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intypes = os.path.join(musl, 'include', 'alltypes.h.in')
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out = check_output(['sed', '-f', mkalltypes, inbits, intypes])
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with open(os.path.join(outroot, 'alltypes.h'), 'w') as o:
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o.write(out)
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insyscall = os.path.join(musl, 'arch', arch, 'bits', 'syscall.h.in')
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out = check_output(['sed', '-n', '-e', 's/__NR_/SYS_/p', insyscall])
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with open(os.path.join(outroot, 'syscall.h'), 'w') as o:
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o.write(open(insyscall).read())
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o.write(out)
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def musl_sources(musl_root, include_weak):
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"""musl sources to be built."""
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sources = []
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for d in os.listdir(os.path.join(musl_root, 'src')):
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if d in DIR_BLACKLIST:
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continue
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base = os.path.join(musl_root, 'src', d)
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pattern = os.path.join(base, '*.c')
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for f in glob.glob(pattern):
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if os.path.basename(f) in BLACKLIST:
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continue
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if not include_weak and os.path.basename(f) in WEAK_BLACKLIST:
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continue
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sources.append(f)
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return sorted(sources)
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def includes(musl, arch, outdir):
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"""Include path."""
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includes = [
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os.path.join(musl, 'arch', arch),
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os.path.join(musl, 'arch', 'generic'),
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os.path.join(outdir, 'src', 'internal'),
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os.path.join(musl, 'src', 'internal'),
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os.path.join(outdir, 'include'),
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os.path.join(musl, 'include')]
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return list(itertools.chain(*zip(['-I'] * len(includes), includes)))
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class Compiler(object):
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"""Compile source files."""
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def __init__(self, out, clang_dir, musl, arch, tmpdir):
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self.out = out
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self.outbase = os.path.basename(self.out)
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self.clang_dir = clang_dir
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self.musl = musl
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self.arch = arch
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self.tmpdir = tmpdir
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self.compiled = []
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def compile(self, sources):
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if verbose:
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self.compiled = sorted([self(source) for source in sources])
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else:
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pool = multiprocessing.Pool()
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self.compiled = sorted(pool.map(self, sources))
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pool.close()
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pool.join()
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class ObjCompiler(Compiler):
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def __init__(self, out, clang_dir, musl, arch, tmpdir):
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super(ObjCompiler, self).__init__(out, clang_dir, musl, arch, tmpdir)
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def __call__(self, src):
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target = 'wasm32-unknown-unknown-wasm'
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compile_cmd = [os.path.join(self.clang_dir, 'clang'), '-target', target,
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'-Os', '-c', '-nostdinc']
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compile_cmd += includes(self.musl, self.arch, self.tmpdir)
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compile_cmd += CFLAGS
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check_output(compile_cmd + [src], cwd=self.tmpdir)
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return os.path.basename(src)[:-1] + 'o' # .c -> .o
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def binary(self):
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if os.path.exists(self.out):
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os.remove(self.out)
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check_output([os.path.join(self.clang_dir, 'llvm-ar'), 'rcs', self.out] + self.compiled,
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cwd=self.tmpdir)
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class AsmCompiler(Compiler):
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def __init__(self, out, clang_dir, musl, arch, tmpdir, binaryen_dir,
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sexpr_wasm):
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super(AsmCompiler, self).__init__(out, clang_dir, musl, arch, tmpdir)
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self.binaryen_dir = binaryen_dir
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self.sexpr_wasm = sexpr_wasm
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def __call__(self, src):
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target = 'wasm32-unknown-unknown'
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compile_cmd = [os.path.join(self.clang_dir, 'clang'), '-target', target,
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'-Os', '-emit-llvm', '-S', '-nostdinc']
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compile_cmd += includes(self.musl, self.arch, self.tmpdir)
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compile_cmd += CFLAGS
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check_output(compile_cmd + [src], cwd=self.tmpdir)
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return os.path.basename(src)[:-1] + 'll' # .c -> .ll
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def binary(self):
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max_memory = str(16 * 1024 * 1024)
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bytecode = change_extension(self.out, '.bc')
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assembly = os.path.join(self.tmpdir, self.outbase + '.s')
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check_output([os.path.join(self.clang_dir, 'llvm-link'),
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'-o', bytecode] + self.compiled,
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cwd=self.tmpdir)
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check_output([os.path.join(self.clang_dir, 'llc'),
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bytecode, '-o', assembly],
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cwd=self.tmpdir)
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check_output([os.path.join(self.binaryen_dir, 's2wasm'),
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assembly, '--ignore-unknown', '-o', self.out,
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'--import-memory', '-m', max_memory],
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cwd=self.tmpdir)
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if self.sexpr_wasm:
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check_output([self.sexpr_wasm,
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self.out, '-o', change_extension(self.out, '.wasm')],
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cwd=self.tmpdir)
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def run(clang_dir, binaryen_dir, sexpr_wasm, musl, arch, out, compile_to_wasm):
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objdir = os.path.join(os.path.dirname(out), 'obj')
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if os.path.isdir(objdir):
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shutil.rmtree(objdir)
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os.mkdir(objdir)
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create_version(musl, objdir)
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build_headers(musl, arch, objdir)
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sources = musl_sources(musl, include_weak=compile_to_wasm)
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if compile_to_wasm:
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compiler = ObjCompiler(out, clang_dir, musl, arch, objdir)
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else:
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compiler = AsmCompiler(out, clang_dir, musl, arch, objdir, binaryen_dir,
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sexpr_wasm)
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compiler.compile(sources)
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compiler.binary()
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if compile_to_wasm:
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compiler.compile([os.path.join(musl, 'crt', 'crt1.c')])
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shutil.copy(os.path.join(objdir, compiler.compiled[0]),
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os.path.dirname(out))
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def getargs():
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parser = argparse.ArgumentParser(description='Build a hacky wasm libc.')
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parser.add_argument('--clang_dir', type=str, required=True,
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help='Clang binary directory')
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parser.add_argument('--binaryen_dir', type=str, required=True,
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help='binaryen binary directory')
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parser.add_argument('--sexpr_wasm', type=str, required=False,
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help='sexpr-wasm binary')
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parser.add_argument('--musl', type=str, required=True,
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help='musl libc root directory')
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parser.add_argument('--arch', type=str, default='wasm32',
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help='architecture to target')
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parser.add_argument('--out', '-o', type=str,
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default=os.path.join(os.getcwd(), 'musl.wast'),
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help='Output file')
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parser.add_argument('--verbose', default=False, action='store_true',
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help='Verbose')
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parser.add_argument('--compile-to-wasm', default=False, action='store_true',
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help='Use clang to compile directly to wasm')
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return parser.parse_args()
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def main():
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global verbose
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args = getargs()
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if args.verbose:
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verbose = True
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return run(args.clang_dir, args.binaryen_dir, args.sexpr_wasm,
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args.musl, args.arch, args.out, args.compile_to_wasm)
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if __name__ == '__main__':
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sys.exit(main())
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