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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 | // SPDX-License-Identifier: GPL-2.0 #include <sys/types.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include "symbol.h" #include "demangle-java.h" #include <linux/ctype.h> #include <linux/kernel.h> enum { MODE_PREFIX = 0, MODE_CLASS = 1, MODE_FUNC = 2, MODE_TYPE = 3, MODE_CTYPE = 4, /* class arg */ }; #define BASE_ENT(c, n) [c - 'A']=n static const char *base_types['Z' - 'A' + 1] = { BASE_ENT('B', "byte" ), BASE_ENT('C', "char" ), BASE_ENT('D', "double" ), BASE_ENT('F', "float" ), BASE_ENT('I', "int" ), BASE_ENT('J', "long" ), BASE_ENT('S', "short" ), BASE_ENT('Z', "boolean" ), }; /* * demangle Java symbol between str and end positions and stores * up to maxlen characters into buf. The parser starts in mode. * * Use MODE_PREFIX to process entire prototype till end position * Use MODE_TYPE to process return type if str starts on return type char * * Return: * success: buf * error : NULL */ static char * __demangle_java_sym(const char *str, const char *end, char *buf, int maxlen, int mode) { int rlen = 0; int array = 0; int narg = 0; const char *q; if (!end) end = str + strlen(str); for (q = str; q != end; q++) { if (rlen == (maxlen - 1)) break; switch (*q) { case 'L': if (mode == MODE_PREFIX || mode == MODE_TYPE) { if (mode == MODE_TYPE) { if (narg) rlen += scnprintf(buf + rlen, maxlen - rlen, ", "); narg++; } if (mode == MODE_PREFIX) mode = MODE_CLASS; else mode = MODE_CTYPE; } else buf[rlen++] = *q; break; case 'B': case 'C': case 'D': case 'F': case 'I': case 'J': case 'S': case 'Z': if (mode == MODE_TYPE) { if (narg) rlen += scnprintf(buf + rlen, maxlen - rlen, ", "); rlen += scnprintf(buf + rlen, maxlen - rlen, "%s", base_types[*q - 'A']); while (array--) rlen += scnprintf(buf + rlen, maxlen - rlen, "[]"); array = 0; narg++; } else buf[rlen++] = *q; break; case 'V': if (mode == MODE_TYPE) { rlen += scnprintf(buf + rlen, maxlen - rlen, "void"); while (array--) rlen += scnprintf(buf + rlen, maxlen - rlen, "[]"); array = 0; } else buf[rlen++] = *q; break; case '[': if (mode != MODE_TYPE) goto error; array++; break; case '(': if (mode != MODE_FUNC) goto error; buf[rlen++] = *q; mode = MODE_TYPE; break; case ')': if (mode != MODE_TYPE) goto error; buf[rlen++] = *q; narg = 0; break; case ';': if (mode != MODE_CLASS && mode != MODE_CTYPE) goto error; /* safe because at least one other char to process */ if (isalpha(*(q + 1)) && mode == MODE_CLASS) rlen += scnprintf(buf + rlen, maxlen - rlen, "."); if (mode == MODE_CLASS) mode = MODE_FUNC; else if (mode == MODE_CTYPE) mode = MODE_TYPE; break; case '/': if (mode != MODE_CLASS && mode != MODE_CTYPE) goto error; rlen += scnprintf(buf + rlen, maxlen - rlen, "."); break; default : buf[rlen++] = *q; } } buf[rlen] = '\0'; return buf; error: return NULL; } /* * Demangle Java function signature (openJDK, not GCJ) * input: * str: string to parse. String is not modified * flags: combination of JAVA_DEMANGLE_* flags to modify demangling * return: * if input can be demangled, then a newly allocated string is returned. * if input cannot be demangled, then NULL is returned * * Note: caller is responsible for freeing demangled string */ char * java_demangle_sym(const char *str, int flags) { char *buf, *ptr; char *p; size_t len, l1 = 0; if (!str) return NULL; /* find start of return type */ p = strrchr(str, ')'); if (!p) return NULL; /* * expansion factor estimated to 3x */ len = strlen(str) * 3 + 1; buf = malloc(len); if (!buf) return NULL; buf[0] = '\0'; if (!(flags & JAVA_DEMANGLE_NORET)) { /* * get return type first */ ptr = __demangle_java_sym(p + 1, NULL, buf, len, MODE_TYPE); if (!ptr) goto error; /* add space between return type and function prototype */ l1 = strlen(buf); buf[l1++] = ' '; } /* process function up to return type */ ptr = __demangle_java_sym(str, p + 1, buf + l1, len - l1, MODE_PREFIX); if (!ptr) goto error; return buf; error: free(buf); return NULL; } |