Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
e9c4bcdd SE |
2 | #include <sys/types.h> |
3 | #include <stdio.h> | |
215a0d30 | 4 | #include <stdlib.h> |
e9c4bcdd | 5 | #include <string.h> |
e9c4bcdd SE |
6 | #include "symbol.h" |
7 | ||
8 | #include "demangle-java.h" | |
9 | ||
3052ba56 | 10 | #include <linux/ctype.h> |
215a0d30 | 11 | #include <linux/kernel.h> |
3d689ed6 | 12 | |
e9c4bcdd SE |
13 | enum { |
14 | MODE_PREFIX = 0, | |
15 | MODE_CLASS = 1, | |
16 | MODE_FUNC = 2, | |
17 | MODE_TYPE = 3, | |
0bdf3181 | 18 | MODE_CTYPE = 4, /* class arg */ |
e9c4bcdd SE |
19 | }; |
20 | ||
21 | #define BASE_ENT(c, n) [c - 'A']=n | |
22 | static const char *base_types['Z' - 'A' + 1] = { | |
23 | BASE_ENT('B', "byte" ), | |
24 | BASE_ENT('C', "char" ), | |
25 | BASE_ENT('D', "double" ), | |
26 | BASE_ENT('F', "float" ), | |
27 | BASE_ENT('I', "int" ), | |
28 | BASE_ENT('J', "long" ), | |
29 | BASE_ENT('S', "short" ), | |
0bdf3181 | 30 | BASE_ENT('Z', "boolean" ), |
e9c4bcdd SE |
31 | }; |
32 | ||
33 | /* | |
34 | * demangle Java symbol between str and end positions and stores | |
35 | * up to maxlen characters into buf. The parser starts in mode. | |
36 | * | |
37 | * Use MODE_PREFIX to process entire prototype till end position | |
38 | * Use MODE_TYPE to process return type if str starts on return type char | |
39 | * | |
40 | * Return: | |
41 | * success: buf | |
42 | * error : NULL | |
43 | */ | |
44 | static char * | |
45 | __demangle_java_sym(const char *str, const char *end, char *buf, int maxlen, int mode) | |
46 | { | |
47 | int rlen = 0; | |
48 | int array = 0; | |
49 | int narg = 0; | |
50 | const char *q; | |
51 | ||
52 | if (!end) | |
53 | end = str + strlen(str); | |
54 | ||
55 | for (q = str; q != end; q++) { | |
56 | ||
57 | if (rlen == (maxlen - 1)) | |
58 | break; | |
59 | ||
60 | switch (*q) { | |
61 | case 'L': | |
0bdf3181 NG |
62 | if (mode == MODE_PREFIX || mode == MODE_TYPE) { |
63 | if (mode == MODE_TYPE) { | |
e9c4bcdd SE |
64 | if (narg) |
65 | rlen += scnprintf(buf + rlen, maxlen - rlen, ", "); | |
66 | narg++; | |
67 | } | |
e9c4bcdd SE |
68 | if (mode == MODE_PREFIX) |
69 | mode = MODE_CLASS; | |
0bdf3181 NG |
70 | else |
71 | mode = MODE_CTYPE; | |
e9c4bcdd SE |
72 | } else |
73 | buf[rlen++] = *q; | |
74 | break; | |
75 | case 'B': | |
76 | case 'C': | |
77 | case 'D': | |
78 | case 'F': | |
79 | case 'I': | |
80 | case 'J': | |
81 | case 'S': | |
82 | case 'Z': | |
83 | if (mode == MODE_TYPE) { | |
84 | if (narg) | |
85 | rlen += scnprintf(buf + rlen, maxlen - rlen, ", "); | |
86 | rlen += scnprintf(buf + rlen, maxlen - rlen, "%s", base_types[*q - 'A']); | |
87 | while (array--) | |
88 | rlen += scnprintf(buf + rlen, maxlen - rlen, "[]"); | |
89 | array = 0; | |
90 | narg++; | |
91 | } else | |
92 | buf[rlen++] = *q; | |
93 | break; | |
94 | case 'V': | |
95 | if (mode == MODE_TYPE) { | |
96 | rlen += scnprintf(buf + rlen, maxlen - rlen, "void"); | |
97 | while (array--) | |
98 | rlen += scnprintf(buf + rlen, maxlen - rlen, "[]"); | |
99 | array = 0; | |
100 | } else | |
101 | buf[rlen++] = *q; | |
102 | break; | |
103 | case '[': | |
104 | if (mode != MODE_TYPE) | |
105 | goto error; | |
106 | array++; | |
107 | break; | |
108 | case '(': | |
109 | if (mode != MODE_FUNC) | |
110 | goto error; | |
111 | buf[rlen++] = *q; | |
112 | mode = MODE_TYPE; | |
113 | break; | |
114 | case ')': | |
115 | if (mode != MODE_TYPE) | |
116 | goto error; | |
117 | buf[rlen++] = *q; | |
118 | narg = 0; | |
119 | break; | |
120 | case ';': | |
121 | if (mode != MODE_CLASS && mode != MODE_CTYPE) | |
122 | goto error; | |
123 | /* safe because at least one other char to process */ | |
0bdf3181 | 124 | if (isalpha(*(q + 1)) && mode == MODE_CLASS) |
e9c4bcdd SE |
125 | rlen += scnprintf(buf + rlen, maxlen - rlen, "."); |
126 | if (mode == MODE_CLASS) | |
127 | mode = MODE_FUNC; | |
128 | else if (mode == MODE_CTYPE) | |
129 | mode = MODE_TYPE; | |
130 | break; | |
131 | case '/': | |
132 | if (mode != MODE_CLASS && mode != MODE_CTYPE) | |
133 | goto error; | |
134 | rlen += scnprintf(buf + rlen, maxlen - rlen, "."); | |
135 | break; | |
136 | default : | |
137 | buf[rlen++] = *q; | |
138 | } | |
139 | } | |
140 | buf[rlen] = '\0'; | |
141 | return buf; | |
142 | error: | |
143 | return NULL; | |
144 | } | |
145 | ||
146 | /* | |
147 | * Demangle Java function signature (openJDK, not GCJ) | |
148 | * input: | |
149 | * str: string to parse. String is not modified | |
4d39c89f | 150 | * flags: combination of JAVA_DEMANGLE_* flags to modify demangling |
e9c4bcdd SE |
151 | * return: |
152 | * if input can be demangled, then a newly allocated string is returned. | |
153 | * if input cannot be demangled, then NULL is returned | |
154 | * | |
155 | * Note: caller is responsible for freeing demangled string | |
156 | */ | |
157 | char * | |
158 | java_demangle_sym(const char *str, int flags) | |
159 | { | |
160 | char *buf, *ptr; | |
161 | char *p; | |
162 | size_t len, l1 = 0; | |
163 | ||
164 | if (!str) | |
165 | return NULL; | |
166 | ||
4d39c89f | 167 | /* find start of return type */ |
e9c4bcdd SE |
168 | p = strrchr(str, ')'); |
169 | if (!p) | |
170 | return NULL; | |
171 | ||
172 | /* | |
173 | * expansion factor estimated to 3x | |
174 | */ | |
175 | len = strlen(str) * 3 + 1; | |
176 | buf = malloc(len); | |
177 | if (!buf) | |
178 | return NULL; | |
179 | ||
180 | buf[0] = '\0'; | |
181 | if (!(flags & JAVA_DEMANGLE_NORET)) { | |
182 | /* | |
183 | * get return type first | |
184 | */ | |
185 | ptr = __demangle_java_sym(p + 1, NULL, buf, len, MODE_TYPE); | |
186 | if (!ptr) | |
187 | goto error; | |
188 | ||
189 | /* add space between return type and function prototype */ | |
190 | l1 = strlen(buf); | |
191 | buf[l1++] = ' '; | |
192 | } | |
193 | ||
194 | /* process function up to return type */ | |
195 | ptr = __demangle_java_sym(str, p + 1, buf + l1, len - l1, MODE_PREFIX); | |
196 | if (!ptr) | |
197 | goto error; | |
198 | ||
199 | return buf; | |
200 | error: | |
201 | free(buf); | |
202 | return NULL; | |
203 | } |