--- /dev/null
+//===-- dictionary.c - Generate fuzzing dictionary for clang --------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// This binary emits a fuzzing dictionary describing strings that are
+// significant to the clang parser: keywords and other tokens.
+//
+// The dictionary can be used by a fuzzer to reach interesting parser states
+// much more quickly.
+//
+// The output is a single-file dictionary supported by libFuzzer and AFL:
+// https://llvm.org/docs/LibFuzzer.html#dictionaries
+//
+//===----------------------------------------------------------------------===//
+
+#include <stdio.h>
+
+static void emit(const char *Name, const char *Spelling) {
+ static char Hex[] = "0123456789abcdef";
+
+ printf("%s=\"", Name);
+ unsigned char C;
+ while ((C = *Spelling++)) {
+ if (C < 32 || C == '"' || C == '\\')
+ printf("\\x%c%c", Hex[C>>4], Hex[C%16]);
+ else
+ printf("%c", C);
+ }
+ printf("\"\n");
+}
+
+int main(int argc, char **argv) {
+#define PUNCTUATOR(Name, Spelling) emit(#Name, Spelling);
+#define KEYWORD(Name, Criteria) emit(#Name, #Name);
+#define PPKEYWORD(Name) emit(#Name, #Name);
+#define CXX_KEYWORD_OPERATOR(Name, Equivalent) emit(#Name, #Name);
+#define OBJC_AT_KEYWORD(Name) emit(#Name, #Name);
+#define ALIAS(Spelling, Equivalent, Criteria) emit(Spelling, Spelling);
+#include "clang/Basic/TokenKinds.def"
+ // Some other sub-token chunks significant to the lexer.
+ emit("ucn16", "\\u0000");
+ emit("ucn32", "\\U00000000");
+ emit("rawstart", "R\"(");
+ emit("rawend", ")\"");
+ emit("quote", "\"");
+ emit("squote", "'");
+ emit("u8quote", "u8\"");
+ emit("u16quote", "u\"");
+ emit("u32quote", "U\"");
+ emit("esc_nl", "\\\n");
+ emit("hex", "0x");
+}
+