#!/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 os # Used to advertise this file's name ("autogenerated_note").
import string
import subprocess
import sys
import tempfile
import re
# Invoke the tool that is being tested.
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)
# Fix line endings to unix CR style.
stdout = stdout.replace('\r\n', '\n')
return stdout
# RegEx: this is where the magic happens.
SCRUB_WHITESPACE_RE = re.compile(r'(?!^(| \w))[ \t]+', flags=re.M)
SCRUB_TRAILING_WHITESPACE_RE = re.compile(r'[ \t]+$', flags=re.M)
SCRUB_X86_SHUFFLES_RE = (
re.compile(
r'^(\s*\w+) [^#\n]+#+ ((?:[xyz]mm\d+|mem)( \{%k\d+\}( \{z\})?)? = .*)$',
flags=re.M))
SCRUB_X86_SP_RE = re.compile(r'\d+\(%(esp|rsp)\)')
SCRUB_X86_RIP_RE = re.compile(r'[.\w]+\(%rip\)')
SCRUB_X86_LCP_RE = re.compile(r'\.LCPI[0-9]+_[0-9]+')
SCRUB_KILL_COMMENT_RE = re.compile(r'^ *#+ +kill:.*\n')
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<func>[^:]+):[ \t]*#+[ \t]*@(?P=func)\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)?:')
def scrub_asm(asm):
# Scrub runs of whitespace out of the assembly, but leave the leading
# whitespace in place.
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 = SCRUB_X86_SHUFFLES_RE.sub(r'\1 {{.*#+}} \2', asm)
# Generically match the stack offset of a memory operand.
asm = SCRUB_X86_SP_RE.sub(r'{{[0-9]+}}(%\1)', asm)
# Generically match a RIP-relative memory operand.
asm = SCRUB_X86_RIP_RE.sub(r'{{.*}}(%rip)', asm)
# Generically match a LCP symbol.
asm = SCRUB_X86_LCP_RE.sub(r'{{\.LCPI.*}}', asm)
# Strip kill operands inserted into the asm.
asm = SCRUB_KILL_COMMENT_RE.sub('', asm)
# Strip trailing whitespace.
asm = SCRUB_TRAILING_WHITESPACE_RE.sub(r'', asm)
return asm
# Build up a dictionary of all the function bodies.
def build_function_body_dictionary(raw_tool_output, prefixes, func_dict, verbose):
for m in ASM_FUNCTION_RE.finditer(raw_tool_output):
if not m:
continue
func = m.group('func')
scrubbed_body = scrub_asm(m.group('body'))
if func.startswith('stress'):
# We only use the last line of the function body for stress tests.
scrubbed_body = '\n'.join(scrubbed_body.splitlines()[-1:])
if verbose:
print >>sys.stderr, 'Processing function: ' + func
for l in scrubbed_body.splitlines():
print >>sys.stderr, ' ' + l
for prefix in prefixes:
if func in func_dict[prefix] and func_dict[prefix][func] != scrubbed_body:
if prefix == prefixes[-1]:
print >>sys.stderr, ('WARNING: Found conflicting asm under the '
'same prefix: %r!' % (prefix,))
else:
func_dict[prefix][func] = None
continue
func_dict[prefix][func] = scrubbed_body
def add_checks(output_lines, prefix_list, func_dict, func_name):
printed_prefixes = []
for checkprefixes, _ in prefix_list:
for checkprefix in checkprefixes:
if checkprefix in printed_prefixes:
break
if not func_dict[checkprefix][func_name]:
continue
# Add some space between different check prefixes.
if len(printed_prefixes) != 0:
output_lines.append(';')
printed_prefixes.append(checkprefix)
output_lines.append('; %s-LABEL: %s:' % (checkprefix, func_name))
func_body = func_dict[checkprefix][func_name].splitlines()
output_lines.append('; %s: %s' % (checkprefix, func_body[0]))
for func_line in func_body[1:]:
output_lines.append('; %s-NEXT: %s' % (checkprefix, func_line))
# Add space between different check prefixes and the first line of code.
# output_lines.append(';')
break
return output_lines
def should_add_line_to_output(input_line, prefix_set):
# Skip any blank comment lines in the IR.
if input_line.strip() == ';':
return False
# Skip any blank lines in the IR.
#if input_line.strip() == '':
# return False
# And skip any CHECK lines. We're building our own.
m = CHECK_RE.match(input_line)
if m and m.group(1) in prefix_set:
return False
return True
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()
autogenerated_note = ('; NOTE: Assertions have been autogenerated by '
'utils/' + os.path.basename(__file__))
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:
input_lines = [l.rstrip() for l in f]
run_lines = [m.group(1)
for m in [RUN_LINE_RE.match(l) for l in input_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
prefix_list = []
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.
prefix_list.append((check_prefixes, llc_cmd_args))
func_dict = {}
for prefixes, _ in prefix_list:
for prefix in prefixes:
func_dict.update({prefix: dict()})
for prefixes, llc_args in prefix_list:
if args.verbose:
print >>sys.stderr, 'Extracted LLC cmd: llc ' + llc_args
print >>sys.stderr, 'Extracted FileCheck prefixes: ' + str(prefixes)
raw_tool_output = llc(args, llc_args, test)
build_function_body_dictionary(raw_tool_output, prefixes, func_dict, args.verbose)
is_in_function = False
is_in_function_start = False
prefix_set = set([prefix for prefixes, _ in prefix_list for prefix in prefixes])
if args.verbose:
print >>sys.stderr, 'Rewriting FileCheck prefixes: %s' % (prefix_set,)
output_lines = []
output_lines.append(autogenerated_note)
for input_line in input_lines:
if is_in_function_start:
if input_line == '':
continue
if input_line.lstrip().startswith(';'):
m = CHECK_RE.match(input_line)
if not m or m.group(1) not in prefix_set:
output_lines.append(input_line)
continue
# Print out the various check lines here.
output_lines = add_checks(output_lines, prefix_list, func_dict, name)
is_in_function_start = False
if is_in_function:
if should_add_line_to_output(input_line, prefix_set) == True:
# This input line of the function body will go as-is into the output.
output_lines.append(input_line)
else:
continue
if input_line.strip() == '}':
is_in_function = False
continue
if input_line == autogenerated_note:
continue
# If it's outside a function, it just gets copied to the output.
output_lines.append(input_line)
m = IR_FUNCTION_RE.match(input_line)
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 lines to %s...' % (len(output_lines), test)
with open(test, 'wb') as f:
f.writelines([l + '\n' for l in output_lines])
if __name__ == '__main__':
main()