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#!/usr/bin/env python3
# viewcfg - A script for viewing the CFG of SIL and LLVM IR -*- python -*-
#
# This source file is part of the Swift.org open source project
#
# Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
# Licensed under Apache License v2.0 with Runtime Library Exception
#
# See https://swift.org/LICENSE.txt for license information
# See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
#
# ----------------------------------------------------------------------------
#
# For vim users: use the following lines in .vimrc...
#
# com! -nargs=? Funccfg silent ?{$?,/^}/w !viewcfg <args>
# com! -range -nargs=? Viewcfg silent <line1>,<line2>w !viewcfg <args>
#
# ...to add these commands:
#
# :Funccfg displays the CFG of the current SIL/LLVM function.
# :<range>Viewcfg displays the sub-CFG of the selected range.
#
# Note: viewcfg should be in the $PATH and .dot files should be associated
# with the Graphviz app.
#
# ----------------------------------------------------------------------------
import argparse
import re
import subprocess
import sys
import tempfile
fontname = "helvetica"
class Block(object):
current_index = 0
def __init__(self, name, preds):
self.name = name
self.content = None
self.preds = []
self.succs = None
self.last_line = None
self.index = Block.current_index
Block.current_index += 1
if preds is not None:
for pred in re.split("[, %]", preds):
can_pred = pred.strip()
if can_pred:
self.preds.append(can_pred)
def add_line(self, text):
if self.content is None:
self.content = ""
escaped_text = re.sub(r'([\\<>{}"|])', r'\\\1', text[0:80]).rstrip()
if len(escaped_text) > 0:
self.content += escaped_text + '\\l'
self.last_line = text
def get_succs(self):
if self.succs is None:
self.succs = []
if self.last_line is not None:
for match in re.finditer(r'\bbb[0-9]+\w*\b', self.last_line):
self.succs.append(match.group())
it = re.finditer(r'\blabel %"?([^\s"]+)\b', self.last_line)
for match in it:
self.succs.append(match.group(1))
return self.succs
def parse_args():
parser = argparse.ArgumentParser(description="""
Simple regex based transform of SIL and LLVM-IR into graphviz form.
""")
parser.add_argument("output_suffix", nargs='?')
parser.add_argument("--disable_inst_dump", action='store_true')
parser.add_argument("--input_file", type=argparse.FileType('r'),
default=sys.stdin)
parser.add_argument("--renderer", choices=["Graphviz", "dot"],
default="Graphviz", help="Default is Graphviz")
return parser.parse_args()
def main():
args = parse_args()
suffix = ""
if args.output_suffix:
suffix = args.output_suffix
block_list = []
block_map = {}
cur_block = None
sil_block_pattern = re.compile(r'^(\S+)(\(.*\))?: *(\/\/ *Preds:(.*))?$')
llvm_block_pattern1 = re.compile(r'^"?([^\s"]+)"?: *; *preds =(.*)?$')
llvm_block_pattern2 = re.compile(r'^(\d+):? *; *preds =(.*)?$')
# Scan the input file.
for line in args.input_file.readlines():
sil_block_match = sil_block_pattern.match(line)
llvm_block_match1 = llvm_block_pattern1.match(line)
llvm_block_match2 = llvm_block_pattern2.match(line)
block_name = None
preds = None
if sil_block_match:
block_name = sil_block_match.group(1)
preds = sil_block_match.group(4)
elif llvm_block_match1:
block_name = llvm_block_match1.group(1)
preds = llvm_block_match1.group(2)
elif llvm_block_match2:
block_name = llvm_block_match2.group(1)
preds = llvm_block_match2.group(2)
elif line.startswith(' '):
if cur_block is not None:
cur_block.add_line(line)
elif not line[:1].isspace():
if line.startswith('}') and block_map:
break
cur_block = None
if block_name is not None:
cur_block = Block(block_name, preds)
cur_block.add_line(line)
block_list.append(cur_block)
block_map[block_name] = cur_block
# Add empty blocks which we didn't see, but which are referenced.
new_blocks = {}
for block in block_list:
for adj_name in (block.preds + block.get_succs()):
if adj_name not in block_map:
new_blocks[adj_name] = Block(adj_name, None)
block_map.update(new_blocks.items())
# Add missing edges if we didn't see a successor in the terminator
# but the block is mentioned in the pred list of the successor.
for block in block_list:
for pred_name in block.preds:
pred_block = block_map[pred_name]
if block.name not in pred_block.get_succs():
pred_block.get_succs().append(block.name)
# Write the output dot file.
file_name = tempfile.gettempdir() + "/viewcfg" + suffix + ".dot"
with open(file_name, 'w') as out_file:
out_file.write('digraph "CFG" {\n')
out_file.write("""graph [fontname = "{font}"];
node [fontname = "{font}"];
edge [fontname = "{font}"];""".format(font=fontname))
for block in block_list:
if block.content is None or args.disable_inst_dump:
out_file.write(
"\tNode" + str(block.index) +
" [shape=record,color=gray,fontcolor=gray,label=\"{" +
block.name + "}\"];\n")
else:
out_file.write(
"\tNode" + str(block.index) +
" [shape=record,label=\"{" + block.content + "}\"];\n")
for succ_name in block.get_succs():
succ_block = block_map[succ_name]
out_file.write(
"\tNode" + str(block.index) + " -> Node" +
str(succ_block.index) + ";\n")
out_file.write("}\n")
# Open the dot file with the appropriate renderer.
if args.renderer == 'Graphviz':
subprocess.call(["open", "-a", "Graphviz", file_name])
elif args.renderer == 'dot':
pdf = '%s.pdf' % file_name
subprocess.call(["dot", "-Tpdf", file_name, '-o%s' % pdf])
subprocess.call(["open", "-a", "Preview", pdf])
else:
raise RuntimeError('Unknown renderer?!')
if __name__ == '__main__':
main()
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