1 //===- OptEmitter.cpp - Helper for emitting options.----------- -----------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8
9 #include "OptEmitter.h"
10 #include "llvm/ADT/Twine.h"
11 #include "llvm/TableGen/Error.h"
12 #include "llvm/TableGen/Record.h"
13 #include <cctype>
14 #include <cstring>
15
16 namespace llvm {
17
18 // Ordering on Info. The logic should match with the consumer-side function in
19 // llvm/Option/OptTable.h.
20 // FIXME: Make this take StringRefs instead of null terminated strings to
21 // simplify callers.
StrCmpOptionName(const char * A,const char * B)22 static int StrCmpOptionName(const char *A, const char *B) {
23 const char *X = A, *Y = B;
24 char a = tolower(*A), b = tolower(*B);
25 while (a == b) {
26 if (a == '\0')
27 return strcmp(A, B);
28
29 a = tolower(*++X);
30 b = tolower(*++Y);
31 }
32
33 if (a == '\0') // A is a prefix of B.
34 return 1;
35 if (b == '\0') // B is a prefix of A.
36 return -1;
37
38 // Otherwise lexicographic.
39 return (a < b) ? -1 : 1;
40 }
41
CompareOptionRecords(Record * const * Av,Record * const * Bv)42 int CompareOptionRecords(Record *const *Av, Record *const *Bv) {
43 const Record *A = *Av;
44 const Record *B = *Bv;
45
46 // Sentinel options precede all others and are only ordered by precedence.
47 bool ASent = A->getValueAsDef("Kind")->getValueAsBit("Sentinel");
48 bool BSent = B->getValueAsDef("Kind")->getValueAsBit("Sentinel");
49 if (ASent != BSent)
50 return ASent ? -1 : 1;
51
52 // Compare options by name, unless they are sentinels.
53 if (!ASent)
54 if (int Cmp = StrCmpOptionName(A->getValueAsString("Name").str().c_str(),
55 B->getValueAsString("Name").str().c_str()))
56 return Cmp;
57
58 if (!ASent) {
59 std::vector<StringRef> APrefixes = A->getValueAsListOfStrings("Prefixes");
60 std::vector<StringRef> BPrefixes = B->getValueAsListOfStrings("Prefixes");
61
62 for (std::vector<StringRef>::const_iterator APre = APrefixes.begin(),
63 AEPre = APrefixes.end(),
64 BPre = BPrefixes.begin(),
65 BEPre = BPrefixes.end();
66 APre != AEPre && BPre != BEPre; ++APre, ++BPre) {
67 if (int Cmp = StrCmpOptionName(APre->str().c_str(), BPre->str().c_str()))
68 return Cmp;
69 }
70 }
71
72 // Then by the kind precedence;
73 int APrec = A->getValueAsDef("Kind")->getValueAsInt("Precedence");
74 int BPrec = B->getValueAsDef("Kind")->getValueAsInt("Precedence");
75 if (APrec == BPrec && A->getValueAsListOfStrings("Prefixes") ==
76 B->getValueAsListOfStrings("Prefixes")) {
77 PrintError(A->getLoc(), Twine("Option is equivalent to"));
78 PrintError(B->getLoc(), Twine("Other defined here"));
79 PrintFatalError("Equivalent Options found.");
80 }
81 return APrec < BPrec ? -1 : 1;
82 }
83
84 } // namespace llvm
85