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1#!/usr/bin/env python
2
3def analyze_match_table(path):
4    # Extract the instruction table.
5    data = open(path).read()
6    start = data.index("static const MatchEntry MatchTable")
7    end = data.index("\n};\n", start)
8    lines = data[start:end].split("\n")[1:]
9
10    # Parse the instructions.
11    insns = []
12    for ln in lines:
13        ln = ln.split("{", 1)[1]
14        ln = ln.rsplit("}", 1)[0]
15        a,bc = ln.split("{", 1)
16        b,c = bc.split("}", 1)
17        code, string, converter, _ = [s.strip()
18                                      for s in a.split(",")]
19        items = [s.strip() for s in b.split(",")]
20        _,features = [s.strip() for s in c.split(",")]
21        assert string[0] == string[-1] == '"'
22        string = string[1:-1]
23        insns.append((code,string,converter,items,features))
24
25    # For every mnemonic, compute whether or not it can have a carry setting
26    # operand and whether or not it can have a predication code.
27    mnemonic_flags = {}
28    for insn in insns:
29        mnemonic = insn[1]
30        items = insn[3]
31        flags = mnemonic_flags[mnemonic] = mnemonic_flags.get(mnemonic, set())
32        flags.update(items)
33
34    mnemonics = set(mnemonic_flags)
35    ccout_mnemonics = set(m for m in mnemonics
36                          if 'MCK_CCOut' in mnemonic_flags[m])
37    condcode_mnemonics = set(m for m in mnemonics
38                             if 'MCK_CondCode' in mnemonic_flags[m])
39    noncondcode_mnemonics = mnemonics - condcode_mnemonics
40    print ' || '.join('Mnemonic == "%s"' % m
41                      for m in ccout_mnemonics)
42    print ' || '.join('Mnemonic == "%s"' % m
43                      for m in noncondcode_mnemonics)
44
45def main():
46    import sys
47    if len(sys.argv) == 1:
48        import os
49        from lit.Util import capture
50        llvm_obj_root = capture(["llvm-config", "--obj-root"])
51        file = os.path.join(llvm_obj_root,
52                            "lib/Target/ARM/ARMGenAsmMatcher.inc")
53    elif len(sys.argv) == 2:
54        file = sys.argv[1]
55    else:
56        raise NotImplementedError
57
58    analyze_match_table(file)
59
60if __name__ == '__main__':
61    main()
62