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#!/usr/bin/env python3
"""Freeze the build toolchain's native link inputs into the compiler."""
import argparse
import json
from pathlib import Path
import re
import shlex
import subprocess
import zlib
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument("--compiler", required=True)
parser.add_argument("--output", required=True)
parser.add_argument("--platform", choices=("linux", "windows", "macos"), required=True)
parser.add_argument("--flag", action="append", default=[])
args = parser.parse_args()
output = Path(args.output)
output.parent.mkdir(parents=True, exist_ok=True)
def compiler(*options):
return subprocess.run([args.compiler, *args.flag, *options], check=True,
capture_output=True, text=True)
# An actual object lets the driver validate its inputs without linking a probe.
source = output.parent / "native-probe.cc"
obj = output.parent / "native-probe.o"
binary = output.parent / "native-probe.out"
source.write_text("int main() { return 0; }\n")
compiler("-c", str(source), "-o", str(obj))
static = [] if args.platform == "macos" else (
["-static"] if args.platform == "windows" else
["-static-libstdc++", "-static-libgcc"])
trace = compiler("-###", "-fuse-ld=lld", *static, str(obj), "-o", str(binary))
commands = [shlex.split(line.strip()) for line in trace.stderr.splitlines()
if line.lstrip().startswith('"')]
if len(commands) != 1:
raise RuntimeError("Expected one native linker command: " + trace.stderr)
command = commands[0][1:]
directories = [Path(arg[2:]) for arg in command if arg.startswith("-L")]
target = compiler("-print-effective-triple").stdout.strip()
files = {}
scripts = set()
arguments = []
root = "@CPSC_RUNTIME@"
def resolve(name, static_only=False):
if name.startswith(":"):
names = [name[1:]]
elif args.platform == "macos":
names = ["lib" + name + suffix for suffix in (".tbd", ".dylib", ".a")]
elif static_only:
names = ["lib" + name + ".a"]
else:
names = ["lib" + name + suffix for suffix in (".dll.a", ".so", ".a")]
for directory in directories:
for filename in names:
path = directory / filename
if path.is_file():
return path
for filename in names:
found = Path(compiler("-print-file-name=" + filename).stdout.strip())
if found.is_file():
return found
raise RuntimeError("Cannot find native link input " + name)
sdk = None
if args.platform == "macos":
if "-syslibroot" not in command:
raise RuntimeError("A macOS SDK is required to prepare native linking")
sdk = Path(command[command.index("-syslibroot") + 1])
directories += [sdk / "usr/lib"]
# System dylibs live in the dyld cache on users' machines. Embed their
# SDK link interfaces, not runtime dylibs or SDK headers.
for path in sorted((sdk / "usr/lib").rglob("*.tbd")):
files["sdk/" + path.relative_to(sdk).as_posix()] = path.read_bytes()
mapped = {}
def resource(path):
path = path.resolve()
if path in mapped:
return root + "/" + mapped[path]
if sdk and path.is_relative_to(sdk.resolve()):
name = "sdk/" + path.relative_to(sdk.resolve()).as_posix()
else:
name = "files/" + str(len(mapped)) + "/" + path.name
mapped[path] = name
data = path.read_bytes()
if b"GNU ld script" in data[:256]:
text = re.sub(r"/\*.*?\*/", "", data.decode(), flags=re.S)
# GNU libc/libm linker scripts contain absolute paths and nested
# GROUP/AS_NEEDED inputs. Relocate every referenced link input.
pattern = r"(?:/[^\s()]+|lib[\w.+-]+\.(?:so(?:\.[\d]+)*|a))"
def relocate(match):
token = match.group()
dependency = Path(token)
if not dependency.is_file():
dependency = resolve(":" + token)
return '"' + resource(dependency) + '"'
data = re.sub(pattern, relocate, text).encode()
scripts.add(name)
files[name] = data
return root + "/" + name
static_only = args.platform == "windows"
i = 0
while i < len(command):
arg = command[i]
i += 1
if arg == "-o":
i += 1
elif arg == str(obj):
pass
elif arg == "-L":
i += 1
elif arg.startswith("-L"):
pass
elif arg in ("-dynamic-linker", "--dynamic-linker"):
# The interpreter must remain an operating-system path.
arguments += [arg, command[i]]
i += 1
elif arg == "-syslibroot":
arguments += [arg, root + "/sdk"]
i += 1
elif arg in ("-Bstatic", "-Bdynamic"):
static_only = arg == "-Bstatic"
arguments.append(arg)
elif arg.startswith("-l"):
arguments.append(resource(resolve(arg[2:], static_only)))
elif Path(arg).is_file():
arguments.append(resource(Path(arg)))
else:
arguments.append(arg)
blob = bytearray()
manifest = {"target": target, "arguments": arguments, "files": []}
for name, data in files.items():
manifest["files"].append({"path": name, "offset": len(blob),
"size": len(data), "script": name in scripts})
blob.extend(data)
compressed = zlib.compress(blob, 9)
# Small separate literals avoid MSVC's individual string literal limit.
literals = "\n".join('"' + "".join(f"\\x{b:02x}" for b in compressed[i:i+1024]) + '"'
for i in range(0, len(compressed), 1024))
content = ("// Generated native link resources; do not edit.\n"
f"static constexpr size_t NativeRuntimeSize = {len(blob)};\n"
"static const char NativeRuntimeData[] =\n" + literals + ";\n"
'static const char NativeRuntimeManifest[] = R"CPSC(\n' +
json.dumps(manifest) + '\n)CPSC";\n')
if not output.exists() or output.read_text() != content:
output.write_text(content)
# Track the actual toolchain inputs, not only the generator script.
dependencies = [str(path) for path in mapped]
if sdk:
dependencies += [str(path) for path in (sdk / "usr/lib").rglob("*.tbd")]
(output.parent / "native-runtime-inputs.cmake").write_text(
"set_property(DIRECTORY APPEND PROPERTY CMAKE_CONFIGURE_DEPENDS\n" +
"\n".join(' [==[' + path + ']==]' for path in dependencies) + ")\n")
print(f"Embedded {len(files)} native link inputs ({len(compressed)} compressed bytes)")
if __name__ == "__main__":
main()
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