1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
|
#!/usr/bin/env python
"""Reduces GlobalISel failures.
This script is a utility to reduce tests that GlobalISel
fails to compile.
It runs llc to get the error message using a regex and creates
a custom command to check that specific error. Then, it runs bugpoint
with the custom command.
"""
from __future__ import print_function
import argparse
import re
import subprocess
import sys
import tempfile
import os
def log(msg):
print(msg)
def hr():
log("-" * 50)
def log_err(msg):
print("ERROR: {}".format(msg), file=sys.stderr)
def check_path(path):
if not os.path.exists(path):
log_err("{} does not exist.".format(path))
raise
return path
def check_bin(build_dir, bin_name):
file_name = "{}/bin/{}".format(build_dir, bin_name)
return check_path(file_name)
def run_llc(llc, irfile):
pr = subprocess.Popen(
[llc, "-o", "-", "-global-isel", "-pass-remarks-missed=gisel", irfile],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
)
out, err = pr.communicate()
res = pr.wait()
if res == 0:
return 0
re_err = re.compile(
r"LLVM ERROR: ([a-z\s]+):.*(G_INTRINSIC[_A-Z]* <intrinsic:@[a-zA-Z0-9\.]+>|G_[A-Z_]+)"
)
match = re_err.match(err)
if not match:
return 0
else:
return [match.group(1), match.group(2)]
def run_bugpoint(bugpoint_bin, llc_bin, opt_bin, tmp, ir_file):
compileCmd = "-compile-command={} -c {} {}".format(
os.path.realpath(__file__), llc_bin, tmp
)
pr = subprocess.Popen(
[
bugpoint_bin,
"-compile-custom",
compileCmd,
"-opt-command={}".format(opt_bin),
ir_file,
]
)
res = pr.wait()
if res != 0:
log_err("Unable to reduce the test.")
raise
def run_bugpoint_check():
path_to_llc = sys.argv[2]
path_to_err = sys.argv[3]
path_to_ir = sys.argv[4]
with open(path_to_err, "r") as f:
err = f.read()
res = run_llc(path_to_llc, path_to_ir)
if res == 0:
return 0
log("GlobalISed failed, {}: {}".format(res[0], res[1]))
if res != err.split(";"):
return 0
else:
return 1
def main():
# Check if this is called by bugpoint.
if len(sys.argv) == 5 and sys.argv[1] == "-c":
sys.exit(run_bugpoint_check())
# Parse arguments.
parser = argparse.ArgumentParser(
description=__doc__, formatter_class=argparse.RawTextHelpFormatter
)
parser.add_argument("BuildDir", help="Path to LLVM build directory")
parser.add_argument("IRFile", help="Path to the input IR file")
args = parser.parse_args()
# Check if the binaries exist.
build_dir = check_path(args.BuildDir)
ir_file = check_path(args.IRFile)
llc_bin = check_bin(build_dir, "llc")
opt_bin = check_bin(build_dir, "opt")
bugpoint_bin = check_bin(build_dir, "bugpoint")
# Run llc to see if GlobalISel fails.
log("Running llc...")
res = run_llc(llc_bin, ir_file)
if res == 0:
log_err("Expected failure")
raise
hr()
log("GlobalISel failed, {}: {}.".format(res[0], res[1]))
tmp = tempfile.NamedTemporaryFile()
log("Writing error to {} for bugpoint.".format(tmp.name))
tmp.write(";".join(res))
tmp.flush()
hr()
# Run bugpoint.
log("Running bugpoint...")
run_bugpoint(bugpoint_bin, llc_bin, opt_bin, tmp.name, ir_file)
hr()
log("Done!")
hr()
output_file = "bugpoint-reduced-simplified.bc"
log("Run llvm-dis to disassemble the output:")
log("$ {}/bin/llvm-dis -o - {}".format(build_dir, output_file))
log("Run llc to reproduce the problem:")
log(
"$ {}/bin/llc -o - -global-isel "
"-pass-remarks-missed=gisel {}".format(build_dir, output_file)
)
if __name__ == "__main__":
main()
|
