1 //===-- dictionary.c - Generate fuzzing dictionary for clang --------------===//
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 // This binary emits a fuzzing dictionary describing strings that are
10 // significant to the clang parser: keywords and other tokens.
11 //
12 // The dictionary can be used by a fuzzer to reach interesting parser states
13 // much more quickly.
14 //
15 // The output is a single-file dictionary supported by libFuzzer and AFL:
16 // https://llvm.org/docs/LibFuzzer.html#dictionaries
17 //
18 //===----------------------------------------------------------------------===//
19
20 #include <stdio.h>
21
emit(const char * Name,const char * Spelling)22 static void emit(const char *Name, const char *Spelling) {
23 static char Hex[] = "0123456789abcdef";
24 // Skip EmptySpellingName for IsDeducible.
25 if (!Name[0]) return;
26
27 printf("%s=\"", Name);
28 unsigned char C;
29 while ((C = *Spelling++)) {
30 if (C < 32 || C == '"' || C == '\\')
31 printf("\\x%c%c", Hex[C>>4], Hex[C%16]);
32 else
33 printf("%c", C);
34 }
35 printf("\"\n");
36 }
37
main(int argc,char ** argv)38 int main(int argc, char **argv) {
39 #define PUNCTUATOR(Name, Spelling) emit(#Name, Spelling);
40 #define KEYWORD(Name, Criteria) emit(#Name, #Name);
41 #define PPKEYWORD(Name) emit(#Name, #Name);
42 #define CXX_KEYWORD_OPERATOR(Name, Equivalent) emit(#Name, #Name);
43 #define OBJC_AT_KEYWORD(Name) emit(#Name, #Name);
44 #define ALIAS(Spelling, Equivalent, Criteria) emit(Spelling, Spelling);
45 #include "clang/Basic/TokenKinds.def"
46 // Some other sub-token chunks significant to the lexer.
47 emit("ucn16", "\\u0000");
48 emit("ucn32", "\\U00000000");
49 emit("rawstart", "R\"(");
50 emit("rawend", ")\"");
51 emit("quote", "\"");
52 emit("squote", "'");
53 emit("u8quote", "u8\"");
54 emit("u16quote", "u\"");
55 emit("u32quote", "U\"");
56 emit("esc_nl", "\\\n");
57 emit("hex", "0x");
58 }
59
60