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update_llc_test_checks.py
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#!/usr/bin/env python2.7
"""A test case update script.
This script is a utility to update LLVM X86 'llc' based test cases with new
FileCheck patterns. It can either update all of the tests in the file or
a single test function.
"""
import argparse
import itertools
import string
import subprocess
import sys
import tempfile
import re
def llc(args, cmd_args, ir):
with open(ir) as ir_file:
stdout = subprocess.check_output(args.llc_binary + ' ' + cmd_args,
shell=True, stdin=ir_file)
return stdout
ASM_SCRUB_WHITESPACE_RE = re.compile(r'(?!^(| \w))[ \t]+', flags=re.M)
ASM_SCRUB_TRAILING_WHITESPACE_RE = re.compile(r'[ \t]+$', flags=re.M)
ASM_SCRUB_SHUFFLES_RE = (
re.compile(
r'^(\s*\w+) [^#\n]+#+ ((?:[xyz]mm\d+|mem) = .*)$',
flags=re.M))
ASM_SCRUB_SP_RE = re.compile(r'\d+\(%(esp|rsp)\)')
ASM_SCRUB_RIP_RE = re.compile(r'[.\w]+\(%rip\)')
ASM_SCRUB_KILL_COMMENT_RE = re.compile(r'^ *#+ +kill:.*\n')
def scrub_asm(asm):
# Scrub runs of whitespace out of the assembly, but leave the leading
# whitespace in place.
asm = ASM_SCRUB_WHITESPACE_RE.sub(r' ', asm)
# Expand the tabs used for indentation.
asm = string.expandtabs(asm, 2)
# Detect shuffle asm comments and hide the operands in favor of the comments.
asm = ASM_SCRUB_SHUFFLES_RE.sub(r'\1 {{.*#+}} \2', asm)
# Generically match the stack offset of a memory operand.
asm = ASM_SCRUB_SP_RE.sub(r'{{[0-9]+}}(%\1)', asm)
# Generically match a RIP-relative memory operand.
asm = ASM_SCRUB_RIP_RE.sub(r'{{.*}}(%rip)', asm)
# Strip kill operands inserted into the asm.
asm = ASM_SCRUB_KILL_COMMENT_RE.sub('', asm)
# Strip trailing whitespace.
asm = ASM_SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
return asm
def main():
parser = argparse.ArgumentParser(description=__doc__)
parser.add_argument('-v', '--verbose', action='store_true',
help='Show verbose output')
parser.add_argument('--llc-binary', default='llc',
help='The "llc" binary to use to generate the test case')
parser.add_argument(
'--function', help='The function in the test file to update')
parser.add_argument('tests', nargs='+')
args = parser.parse_args()
run_line_re = re.compile('^\s*;\s*RUN:\s*(.*)$')
ir_function_re = re.compile('^\s*define\s+(?:internal\s+)?[^@]*@(\w+)\s*\(')
asm_function_re = re.compile(
r'^_?(?P<f>[^:]+):[ \t]*#+[ \t]*@(?P=f)\n[^:]*?'
r'(?P<body>^##?[ \t]+[^:]+:.*?)\s*'
r'^\s*(?:[^:\n]+?:\s*\n\s*\.size|\.cfi_endproc|\.globl|\.comm|\.(?:sub)?section)',
flags=(re.M | re.S))
check_prefix_re = re.compile('--check-prefix=(\S+)')
check_re = re.compile(r'^\s*;\s*([^:]+?)(?:-NEXT|-NOT|-DAG|-LABEL)?:')
autogenerated_note = ('; NOTE: Assertions have been autogenerated by '
'utils/update_llc_test_checks.py')
for test in args.tests:
if args.verbose:
print >>sys.stderr, 'Scanning for RUN lines in test file: %s' % (test,)
with open(test) as f:
test_lines = [l.rstrip() for l in f]
run_lines = [m.group(1)
for m in [run_line_re.match(l) for l in test_lines] if m]
if args.verbose:
print >>sys.stderr, 'Found %d RUN lines:' % (len(run_lines),)
for l in run_lines:
print >>sys.stderr, ' RUN: ' + l
checks = []
for l in run_lines:
(llc_cmd, filecheck_cmd) = tuple([cmd.strip() for cmd in l.split('|', 1)])
if not llc_cmd.startswith('llc '):
print >>sys.stderr, 'WARNING: Skipping non-llc RUN line: ' + l
continue
if not filecheck_cmd.startswith('FileCheck '):
print >>sys.stderr, 'WARNING: Skipping non-FileChecked RUN line: ' + l
continue
llc_cmd_args = llc_cmd[len('llc'):].strip()
llc_cmd_args = llc_cmd_args.replace('< %s', '').replace('%s', '').strip()
check_prefixes = [m.group(1)
for m in check_prefix_re.finditer(filecheck_cmd)]
if not check_prefixes:
check_prefixes = ['CHECK']
# FIXME: We should use multiple check prefixes to common check lines. For
# now, we just ignore all but the last.
checks.append((check_prefixes, llc_cmd_args))
asm = {}
for prefixes, _ in checks:
for prefix in prefixes:
asm.update({prefix: dict()})
for prefixes, llc_args in checks:
if args.verbose:
print >>sys.stderr, 'Extracted LLC cmd: llc ' + llc_args
print >>sys.stderr, 'Extracted FileCheck prefixes: ' + str(prefixes)
raw_asm = llc(args, llc_args, test)
# Build up a dictionary of all the function bodies.
for m in asm_function_re.finditer(raw_asm):
if not m:
continue
f = m.group('f')
f_asm = scrub_asm(m.group('body'))
if f.startswith('stress'):
# We only use the last line of the asm for stress tests.
f_asm = '\n'.join(f_asm.splitlines()[-1:])
if args.verbose:
print >>sys.stderr, 'Processing asm for function: ' + f
for l in f_asm.splitlines():
print >>sys.stderr, ' ' + l
for prefix in prefixes:
if f in asm[prefix] and asm[prefix][f] != f_asm:
if prefix == prefixes[-1]:
print >>sys.stderr, ('WARNING: Found conflicting asm under the '
'same prefix: %r!' % (prefix,))
else:
asm[prefix][f] = None
continue
asm[prefix][f] = f_asm
is_in_function = False
is_in_function_start = False
prefix_set = set([prefix for prefixes, _ in checks for prefix in prefixes])
if args.verbose:
print >>sys.stderr, 'Rewriting FileCheck prefixes: %s' % (prefix_set,)
fixed_lines = []
fixed_lines.append(autogenerated_note)
for l in test_lines:
if is_in_function_start:
if l.lstrip().startswith(';'):
m = check_re.match(l)
if not m or m.group(1) not in prefix_set:
fixed_lines.append(l)
continue
# Print out the various check lines here
printed_prefixes = []
for prefixes, _ in checks:
for prefix in prefixes:
if prefix in printed_prefixes:
break
if not asm[prefix][name]:
continue
if len(printed_prefixes) != 0:
fixed_lines.append(';')
printed_prefixes.append(prefix)
fixed_lines.append('; %s-LABEL: %s:' % (prefix, name))
asm_lines = asm[prefix][name].splitlines()
fixed_lines.append('; %s: %s' % (prefix, asm_lines[0]))
for asm_line in asm_lines[1:]:
fixed_lines.append('; %s-NEXT: %s' % (prefix, asm_line))
break
is_in_function_start = False
if is_in_function:
# Skip any blank comment lines in the IR.
if l.strip() == ';':
continue
# And skip any CHECK lines. We'll build our own.
m = check_re.match(l)
if m and m.group(1) in prefix_set:
continue
# Collect the remaining lines in the function body and look for the end
# of the function.
fixed_lines.append(l)
if l.strip() == '}':
is_in_function = False
continue
if l == autogenerated_note:
continue
fixed_lines.append(l)
m = ir_function_re.match(l)
if not m:
continue
name = m.group(1)
if args.function is not None and name != args.function:
# When filtering on a specific function, skip all others.
continue
is_in_function = is_in_function_start = True
if args.verbose:
print>>sys.stderr, 'Writing %d fixed lines to %s...' % (
len(fixed_lines), test)
with open(test, 'w') as f:
f.writelines([l + '\n' for l in fixed_lines])
if __name__ == '__main__':
main()