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|
#!/usr/bin/python3
#
# FRR extended automake/Makefile functionality helper
#
# This script is executed on/after generating Makefile to add some pieces for
# clippy.
import sys
import os
import subprocess
import re
import argparse
from string import Template
from makevars import MakeReVars
argp = argparse.ArgumentParser(description="FRR Makefile extensions")
argp.add_argument(
"--dev-build",
action="store_const",
const=True,
help="run additional developer checks",
)
args = argp.parse_args()
with open("Makefile", "r") as fd:
before = fd.read()
mv = MakeReVars(before)
clippy_scan = mv["clippy_scan"].strip().split()
for clippy_file in clippy_scan:
assert clippy_file.endswith(".c")
xref_targets = []
for varname in [
"bin_PROGRAMS",
"sbin_PROGRAMS",
"lib_LTLIBRARIES",
"module_LTLIBRARIES",
]:
xref_targets.extend(mv[varname].strip().split())
# check for files using clippy but not listed in clippy_scan
if args.dev_build:
basepath = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
if os.path.exists(os.path.join(basepath, ".git")):
clippy_ref = subprocess.check_output(
[
"git",
"-C",
basepath,
"grep",
"-l",
"-P",
"^#\s*include.*_clippy.c",
"--",
"**.c",
]
).decode("US-ASCII")
clippy_ref = set(clippy_ref.splitlines())
missing = clippy_ref - set(clippy_scan)
if len(missing) > 0:
sys.stderr.write(
'error: files seem to be using clippy, but not listed in "clippy_scan" in subdir.am:\n\t%s\n'
% ("\n\t".join(sorted(missing)))
)
sys.exit(1)
# this additional-dependency rule is stuck onto all compile targets that
# compile a file which uses clippy-generated input, so it has a dependency to
# make that first.
clippydep = Template(
"""
${clippybase}.$$(OBJEXT): ${clippybase}_clippy.c
${clippybase}.lo: ${clippybase}_clippy.c
${clippybase}_clippy.c: $$(CLIPPY_DEPS)"""
)
# this one is used when one .c file is built multiple times with different
# CFLAGS
clippyauxdep = Template(
"""# clippy{
# auxiliary clippy target
${target}: ${clippybase}_clippy.c
# }clippy"""
)
lines = before.splitlines()
autoderp = "#AUTODERP# "
out_lines = []
bcdeps = []
make_rule_re = re.compile("^([^:\s]+):\s*([^:\s]+)\s*($|\n)")
while lines:
line = lines.pop(0)
if line.startswith(autoderp):
line = line[len(autoderp) :]
# allow rerunning on already-clippified Makefile
if line == "# clippy{":
while lines:
line = lines.pop(0)
if line == "# }clippy":
break
continue
if line.startswith("#"):
out_lines.append(line)
continue
full_line = line
full_lines = lines[:]
while full_line.endswith("\\"):
full_line = full_line[:-1] + full_lines.pop(0)
m = make_rule_re.match(full_line)
if m is None:
out_lines.append(line)
continue
line, lines = full_line, full_lines
target, dep = m.group(1), m.group(2)
filename = os.path.basename(target)
if "-" in filename:
# dashes in output filename = building same .c with different CFLAGS
am_name, _ = filename.split("-", 1)
am_name = os.path.join(os.path.dirname(target), am_name)
am_name = am_name.replace("/", "_")
extraflags = " $(%s_CFLAGS)" % (am_name,)
else:
# this path isn't really triggered because automake is using a generic
# .c => .o rule unless CFLAGS are customized for a target
extraflags = ""
if target.endswith(".lo") or target.endswith(".o"):
if not dep.endswith(".h"):
# LLVM bitcode targets for analysis tools
bcdeps.append("%s.bc: %s" % (target, target))
bcdeps.append(
"\t$(AM_V_LLVM_BC)$(COMPILE)%s -emit-llvm -c -o $@ %s"
% (extraflags, dep)
)
if m.group(2) in clippy_scan:
# again - this is only hit for targets with custom CFLAGS, because
# automake uses a generic .c -> .o rule for standard CFLAGS
out_lines.append(
clippyauxdep.substitute(target=m.group(1), clippybase=m.group(2)[:-2])
)
out_lines.append(line)
# now, cover all the .c files that don't have special build rules
out_lines.append("# clippy{\n# main clippy targets")
for clippy_file in clippy_scan:
out_lines.append(clippydep.substitute(clippybase=clippy_file[:-2]))
# combine daemon .xref files into frr.xref
out_lines.append("")
out_lines.append(
"xrefs = %s" % (" ".join(["%s.xref" % target for target in xref_targets]))
)
out_lines.append("frr.xref: $(xrefs)")
out_lines.append("")
# analog but slower way to get the same frr.xref
# frr.xref: $(bin_PROGRAMS) $(sbin_PROGRAMS) $(lib_LTLIBRARIES) $(module_LTLIBRARIES)
# $(AM_V_XRELFO) $(CLIPPY) $(top_srcdir)/python/xrelfo.py -o $@ $^
# LLVM bitcode link targets creating a .bc file for whole daemon or lib
out_lines.append("")
out_lines.extend(bcdeps)
out_lines.append("")
bc_targets = []
for varname in [
"bin_PROGRAMS",
"sbin_PROGRAMS",
"lib_LTLIBRARIES",
"module_LTLIBRARIES",
"noinst_LIBRARIES",
]:
bc_targets.extend(mv[varname].strip().split())
for target in bc_targets:
amtgt = target.replace("/", "_").replace(".", "_").replace("-", "_")
objs = mv[amtgt + "_OBJECTS"].strip().split()
objs = [obj + ".bc" for obj in objs]
deps = mv.get(amtgt + "_DEPENDENCIES", "").strip().split()
deps = [d + ".bc" for d in deps if d.endswith(".a")]
objs.extend(deps)
out_lines.append("%s.bc: %s" % (target, " ".join(objs)))
out_lines.append("\t$(AM_V_LLVM_LD)$(LLVM_LINK) -o $@ $^")
out_lines.append("")
out_lines.append("# }clippy")
out_lines.append("")
after = "\n".join(out_lines)
if after == before:
sys.exit(0)
with open("Makefile.pyout", "w") as fd:
fd.write(after)
os.rename("Makefile.pyout", "Makefile")
|
