Add LLVM 7.0 config generation script

third_party/llvm-7.0/scripts/update.py

+#!/usr/bin/env python3
+
+# Copyright 2018 The SwiftShader Authors. All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from subprocess import run
+
+import argparse
+import multiprocessing
+import os
+import re
+import shutil
+
+
+LLVM_DIR = os.path.abspath(os.path.join('..', 'llvm'))
+
+LLVM_CONFIGS = os.path.abspath(os.path.join('..', 'configs'))
+
+LLVM_OBJS = os.path.join(os.getcwd(), 'llvm_objs')
+
+LLVM_TARGETS = [
+    ('AArch64', ('__aarch64__',)),
+    ('ARM', ('__arm__',)),
+    ('X86', ('__i386__', '__x86_64__')),
+]
+
+LLVM_TRIPLES = {
+    'android': [
+        ('__x86_64__', 'x86_64-linux-android'),
+        ('__i386__', 'i686-linux-android'),
+        ('__arm__', 'armv7-linux-androideabi'),
+        ('__aarch64__', 'aarch64-linux-android'),
+    ],
+    'linux': [
+        ('__x86_64__', 'x86_64-unknown-linux-gnu'),
+        ('__i386__', 'i686-pc-linux-gnu'),
+        ('__arm__', 'armv7-linux-gnueabihf'),
+        ('__aarch64__', 'aarch64-linux-gnu'),
+    ],
+}
+
+LLVM_OPTIONS = [
+    '-DCMAKE_BUILD_TYPE=Release',
+    '-DLLVM_TARGETS_TO_BUILD=' + ';'.join(t[0] for t in LLVM_TARGETS),
+    '-DLLVM_ENABLE_TERMINFO=OFF',
+    '-DLLVM_ENABLE_LIBXML2=OFF',
+    '-DLLVM_ENABLE_LIBEDIT=OFF',
+    '-DLLVM_ENABLE_LIBPFM=OFF',
+    '-DLLVM_ENABLE_ZLIB=OFF',
+]
+
+
+def _parse_args():
+    parser = argparse.ArgumentParser()
+    parser.add_argument('name', help='destination name',
+                        choices=['android', 'linux'])
+    parser.add_argument('-j', '--jobs', help='parallel compilation', type=int)
+    return parser.parse_args()
+
+
+def build_llvm(num_jobs):
+    """Build LLVM and get all generated files."""
+    if num_jobs is None:
+        num_jobs = multiprocessing.cpu_count()
+
+    os.makedirs(LLVM_OBJS, exist_ok=True)
+    run(['cmake', LLVM_DIR] + LLVM_OPTIONS, cwd=LLVM_OBJS)
+    run(['make', '-j' + str(num_jobs)], cwd=LLVM_OBJS)
+
+
+def list_files(src_base, src, dst_base, suffixes):
+    """Enumerate the files that are under `src` and end with one of the
+    `suffixes` and yield the source path and the destination path."""
+    src_base = os.path.abspath(src_base)
+    src = os.path.join(src_base, src)
+    for base_dir, dirnames, filenames in os.walk(src):
+        for filename in filenames:
+            if os.path.splitext(filename)[1] in suffixes:
+                relative = os.path.relpath(base_dir, src_base)
+                yield (os.path.join(base_dir, filename),
+                       os.path.join(dst_base, relative, filename))
+
+
+def copy_common_generated_files(dst_base):
+    """Copy platform-independent generated files."""
+    suffixes = {'.inc', '.h', '.def'}
+    subdirs = [
+        os.path.join('include', 'llvm', 'IR'),
+        os.path.join('include', 'llvm', 'Support'),
+        os.path.join('lib', 'IR'),
+        os.path.join('lib', 'Target', 'AArch64'),
+        os.path.join('lib', 'Target', 'ARM'),
+        os.path.join('lib', 'Target', 'X86'),
+        os.path.join('lib', 'Transforms', 'InstCombine'),
+    ]
+    for subdir in subdirs:
+        for src, dst in list_files(LLVM_OBJS, subdir, dst_base, suffixes):
+            os.makedirs(os.path.dirname(dst), exist_ok=True)
+            shutil.copyfile(src, dst)
+
+
+def copy_platform_file(platform, src, dst):
+    """Copy platform-dependent generated files and add platform-specific
+    modifications."""
+
+    # LLVM configuration patterns to be post-processed.
+    llvm_target_pattern = re.compile('^LLVM_[A-Z_]+\\(([A-Za-z0-9_]+)\\)$')
+    llvm_native_pattern = re.compile(
+        '^#define LLVM_NATIVE_([A-Z]+) (LLVMInitialize)?(.*)$')
+    llvm_triple_pattern = re.compile('^#define (LLVM_[A-Z_]+_TRIPLE) "(.*)"$')
+    llvm_define_pattern = re.compile('^#define ([A-Za-z0-9_]+) (.*)$')
+
+    # LLVM configurations to be undefined.
+    undef_names = [
+        'BACKTRACE_HEADER',
+        'ENABLE_BACKTRACES',
+        'ENABLE_CRASH_OVERRIDES',
+        'HAVE_BACKTRACE',
+        'HAVE_POSIX_SPAWN',
+        'HAVE_PTHREAD_GETNAME_NP',
+        'HAVE_PTHREAD_SETNAME_NP',
+        'HAVE_TERMIOS_H',
+        'HAVE_ZLIB_H',
+        'HAVE__UNWIND_BACKTRACE',
+    ]
+
+    # Build architecture-specific conditions.
+    conds = {}
+    for arch, defs in LLVM_TARGETS:
+        conds[arch] = ' || '.join('defined(' + v + ')' for v in defs)
+
+    # Get a set of platform-specific triples.
+    triples = LLVM_TRIPLES[platform]
+
+    with open(src, 'r') as src_file:
+        os.makedirs(os.path.dirname(dst), exist_ok=True)
+        with open(dst, 'w') as dst_file:
+            for line in src_file:
+                match = llvm_target_pattern.match(line)
+                if match:
+                    arch = match.group(1)
+                    print('#if ' + conds[arch], file=dst_file)
+                    print(line, file=dst_file, end='')
+                    print('#endif', file=dst_file)
+                    continue
+
+                match = llvm_native_pattern.match(line)
+                if match:
+                    name = match.group(1)
+                    init = match.group(2) or ''
+                    arch = match.group(3)
+                    end = ''
+                    if arch.lower().endswith(name.lower()):
+                        end = arch[-len(name):]
+                    directive = '#if '
+                    for arch, defs in LLVM_TARGETS:
+                        print(directive + conds[arch], file=dst_file)
+                        print('#define LLVM_NATIVE_' + name + ' ' +
+                              init + arch + end, file=dst_file)
+                        directive = '#elif '
+                    print('#else', file=dst_file)
+                    print('#error "unknown architecture"', file=dst_file)
+                    print('#endif', file=dst_file)
+                    continue
+
+                match = llvm_triple_pattern.match(line)
+                if match:
+                    name = match.group(1)
+                    directive = '#if'
+                    for defs, triple in triples:
+                        print(directive + ' defined(' + defs + ')',
+                              file=dst_file)
+                        print('#define ' + name + ' "' + triple + '"',
+                              file=dst_file)
+                        directive = '#elif'
+                    print('#else', file=dst_file)
+                    print('#error "unknown architecture"', file=dst_file)
+                    print('#endif', file=dst_file)
+                    continue
+
+                match = llvm_define_pattern.match(line)
+                if match and match.group(1) in undef_names:
+                    print('/* #undef ' + match.group(1) + ' */', file=dst_file)
+                    continue
+
+                print(line, file=dst_file, end='')
+
+
+def copy_platform_generated_files(platform, dst_base):
+    """Copy platform-specific generated files."""
+    suffixes = {'.inc', '.h', '.def'}
+    src_dir = os.path.join('include', 'llvm', 'Config')
+    for src, dst in list_files(LLVM_OBJS, src_dir, dst_base, suffixes):
+        copy_platform_file(platform, src, dst)
+
+
+def main():
+    args = _parse_args()
+    build_llvm(args.jobs)
+    copy_common_generated_files(os.path.join(LLVM_CONFIGS, 'common'))
+    copy_platform_generated_files(
+        args.name, os.path.join(LLVM_CONFIGS, args.name))
+
+
+if __name__ == '__main__':
+    main()