0.4.5/src/symbol_demangle.c

/*
 *  Copyright (C) 2006-2007  Anders Gavare.  All rights reserved.
 *
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright  
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. The name of the author may not be used to endorse or promote products
 *     derived from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 *  ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE   
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 *  OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *  HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 *  LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 *  OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 *  SUCH DAMAGE.
 *
 *
 *  $Id: symbol_demangle.c,v 1.7 2006/12/30 13:30:53 debug Exp $
 *
 *  C++ symbol name demangling.
 *
 *  For obvious performance reasons, the external c++filt utility cannot be
 *  used. Also, the host's version of this utility might be incompatible with
 *  the binary being emulated.
 *
 *  TODO: Constructors, destructors, and lots of other stuff. See
 *  http://www.codesourcery.com/cxx-abi/abi.html#mangling for details.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

#include "symbol.h"


#define MAXLEN          1000


static void add_string(char *p, size_t *curlenp, char *to_add)
{
        size_t curlen = *curlenp;
        while (curlen < MAXLEN && *to_add)
                p[curlen++] = *to_add++;
        *curlenp = curlen;
}


/*
 *  symbol_demangle_cplusplus_nested():
 *
 *  Try to demangle a nested cplusplus name. name points to the first character
 *  after "_ZN".
 */
static char *symbol_demangle_cplusplus_nested(char *name)
{
        char *result = malloc(MAXLEN + 1);
        size_t result_len = 0, len;
        int first = 1, type_added = 0, pointercounter, reference;

        result[0] = '\0';

        while (name[0] && name[0] != 'E' && result_len < MAXLEN) {
                /*  Read length of the next part:  */
                len = 0;
                if (*name == '0') {
                        name ++;
                } else {
                        while (isdigit((int)*name)) {
                                len *= 10;
                                len += (*name - '0');
                                name ++;
                        }
                }

                /*  Add ::  */
                if (!first)
                        add_string(result, &result_len, "::");

                /*  Read the part itself:  */
                while (len-- >= 1 && result_len < MAXLEN)
                        result[result_len ++] = *name++;

                first = 0;
        }

        if (name[0] != 'E')
                goto fail;

        name ++;

        if (*name)
                add_string(result, &result_len, "{");

        /*  Type:  */
        pointercounter = reference = 0;
        while (*name) {
                int argument_done = 0;
                char t = *name++;
                switch (t) {
                case 'c':
                        add_string(result, &result_len, "char");
                        argument_done = 1;
                        break;
                case 'a':
                        add_string(result, &result_len, "signed char");
                        argument_done = 1;
                        break;
                case 'h':
                        add_string(result, &result_len, "unsigned char");
                        argument_done = 1;
                        break;
                case 'i':
                        add_string(result, &result_len, "int");
                        argument_done = 1;
                        break;
                case 'j':
                        add_string(result, &result_len, "unsigned int");
                        argument_done = 1;
                        break;
                case 'w':
                        add_string(result, &result_len, "wchar_t");
                        argument_done = 1;
                        break;
                case 'b':
                        add_string(result, &result_len, "bool");
                        argument_done = 1;
                        break;
                case 's':
                        add_string(result, &result_len, "short");
                        argument_done = 1;
                        break;
                case 't':
                        add_string(result, &result_len, "unsigned short");
                        argument_done = 1;
                        break;
                case 'l':
                        add_string(result, &result_len, "long");
                        argument_done = 1;
                        break;
                case 'm':
                        add_string(result, &result_len, "unsigned long");
                        argument_done = 1;
                        break;
                case 'x':
                        add_string(result, &result_len, "long long");
                        argument_done = 1;
                        break;
                case 'y':
                        add_string(result, &result_len, "unsigned long long");
                        argument_done = 1;
                        break;
                case 'n':
                        add_string(result, &result_len, "__int128");
                        argument_done = 1;
                        break;
                case 'o':
                        add_string(result, &result_len, "unsigned __int128");
                        argument_done = 1;
                        break;
                case 'f':
                        add_string(result, &result_len, "float");
                        argument_done = 1;
                        break;
                case 'd':
                        add_string(result, &result_len, "double");
                        argument_done = 1;
                        break;
                case 'e':
                        add_string(result, &result_len, "__float80");
                        argument_done = 1;
                        break;
                case 'g':
                        add_string(result, &result_len, "__float128");
                        argument_done = 1;
                        break;
                case 'z':
                        add_string(result, &result_len, "...");
                        argument_done = 1;
                        break;
                case 'P':
                        pointercounter ++;
                        break;
                case 'R':
                        reference ++;
                        break;
                case 'v':       /*  void  */
                        break;
                default:/*  Unknown  */
                        goto fail;
                }
                if (argument_done) {
                        while (pointercounter-- > 0)
                                add_string(result, &result_len, "*");
                        while (reference-- > 0)
                                add_string(result, &result_len, "&");
                        if (*name)
                                add_string(result, &result_len, ",");
                }
                type_added = 1;
        }

        if (type_added)
                add_string(result, &result_len, "}");

        if (result_len == MAXLEN)
                goto fail;

        result[result_len] = '\0';

        return result;

fail:
        free(result);
        return NULL;
}


/*
 *  symbol_demangle_cplusplus():
 *
 *  Try to demangle name. If name was not a valid/known C++ symbol, then NULL
 *  is returned. Otherwise, a newly allocated string is returned, containing
 *  the demangled name.
 */
char *symbol_demangle_cplusplus(char *name)
{
        /*  Only support _Z-style mangled names, for now:  */
        if (strlen(name) < 2 || name[0] != '_' || name[1] != 'Z')
                return NULL;

        name += 2;

        switch (name[0]) {
        case 'N':
                return symbol_demangle_cplusplus_nested(name + 1);
                break;
        }

        return NULL;
}


#ifdef TEST

void test(char *mangled, char *result)
{
        char *p = symbol_demangle_cplusplus(mangled);
        if (p == NULL) {
                if (result == NULL) {
                        return;
                } else {
                        printf("FAILURE for %s!\n", mangled);
                        exit(1);
                }
        }
        if (strcmp(p, result) == 0)
                return;
        printf("FAILURE for %s! (result = %s)\n", mangled, p);
        exit(1);
}

int main(int argc, char *argv[])
{
        test("monkey", NULL);
        test("_monkey", NULL);
        test("_zmonkey", NULL);
        test("_Zmonkey", NULL);
        test("_ZQ5abcde", NULL);
        test("_ZN3abc5defghE", "abc::defgh");
        test("_ZN05defghEv", "::defgh{}");
        test("_ZN5defghEv", "defgh{}");
        test("_ZN3abc5defghEv", "abc::defgh{}");
        test("_ZN3abc5defghEc", "abc::defgh{char}");
        test("_ZN1a2bcEjij", "a::bc{unsigned int,int,unsigned int}");
        printf("OK\n");
        return 0;
}

#endif

1	dpavlin	24	/*
2	dpavlin	34	* Copyright (C) 2006-2007 Anders Gavare. All rights reserved.
3	dpavlin	24	*
4			* Redistribution and use in source and binary forms, with or without
5			* modification, are permitted provided that the following conditions are met:
6			*
7			* 1. Redistributions of source code must retain the above copyright
8			* notice, this list of conditions and the following disclaimer.
9			* 2. Redistributions in binary form must reproduce the above copyright
10			* notice, this list of conditions and the following disclaimer in the
11			* documentation and/or other materials provided with the distribution.
12			* 3. The name of the author may not be used to endorse or promote products
13			* derived from this software without specific prior written permission.
14			*
15			* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
16			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
19			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
20			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
21			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
22			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
23			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
24			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
25			* SUCH DAMAGE.
26			*
27			*
28	dpavlin	34	* $Id: symbol_demangle.c,v 1.7 2006/12/30 13:30:53 debug Exp $
29	dpavlin	24	*
30			* C++ symbol name demangling.
31			*
32	dpavlin	32	* For obvious performance reasons, the external c++filt utility cannot be
33			* used. Also, the host's version of this utility might be incompatible with
34			* the binary being emulated.
35	dpavlin	24	*
36			* TODO: Constructors, destructors, and lots of other stuff. See
37			* http://www.codesourcery.com/cxx-abi/abi.html#mangling for details.
38			*/
39
40			#include <stdio.h>
41			#include <stdlib.h>
42			#include <string.h>
43			#include <ctype.h>
44
45			#include "symbol.h"
46
47
48			#define MAXLEN 1000
49
50
51			static void add_string(char p, size_t curlenp, char *to_add)
52			{
53			size_t curlen = *curlenp;
54			while (curlen < MAXLEN && *to_add)
55			p[curlen++] = *to_add++;
56			*curlenp = curlen;
57			}
58
59
60			/*
61			* symbol_demangle_cplusplus_nested():
62			*
63			* Try to demangle a nested cplusplus name. name points to the first character
64			* after "_ZN".
65			*/
66			static char symbol_demangle_cplusplus_nested(char name)
67			{
68			char *result = malloc(MAXLEN + 1);
69			size_t result_len = 0, len;
70			int first = 1, type_added = 0, pointercounter, reference;
71
72			result[0] = '\0';
73
74			while (name[0] && name[0] != 'E' && result_len < MAXLEN) {
75			/* Read length of the next part: */
76			len = 0;
77			if (*name == '0') {
78			name ++;
79			} else {
80			while (isdigit((int)*name)) {
81			len *= 10;
82			len += (*name - '0');
83			name ++;
84			}
85			}
86
87			/* Add :: */
88			if (!first)
89			add_string(result, &result_len, "::");
90
91			/* Read the part itself: */
92			while (len-- >= 1 && result_len < MAXLEN)
93			result[result_len ++] = *name++;
94
95			first = 0;
96			}
97
98			if (name[0] != 'E')
99			goto fail;
100
101			name ++;
102
103			if (*name)
104			add_string(result, &result_len, "{");
105
106			/* Type: */
107			pointercounter = reference = 0;
108			while (*name) {
109			int argument_done = 0;
110			char t = *name++;
111			switch (t) {
112			case 'c':
113			add_string(result, &result_len, "char");
114			argument_done = 1;
115			break;
116			case 'a':
117			add_string(result, &result_len, "signed char");
118			argument_done = 1;
119			break;
120			case 'h':
121			add_string(result, &result_len, "unsigned char");
122			argument_done = 1;
123			break;
124			case 'i':
125			add_string(result, &result_len, "int");
126			argument_done = 1;
127			break;
128			case 'j':
129			add_string(result, &result_len, "unsigned int");
130			argument_done = 1;
131			break;
132			case 'w':
133			add_string(result, &result_len, "wchar_t");
134			argument_done = 1;
135			break;
136			case 'b':
137			add_string(result, &result_len, "bool");
138			argument_done = 1;
139			break;
140			case 's':
141			add_string(result, &result_len, "short");
142			argument_done = 1;
143			break;
144			case 't':
145			add_string(result, &result_len, "unsigned short");
146			argument_done = 1;
147			break;
148			case 'l':
149			add_string(result, &result_len, "long");
150			argument_done = 1;
151			break;
152			case 'm':
153			add_string(result, &result_len, "unsigned long");
154			argument_done = 1;
155			break;
156			case 'x':
157			add_string(result, &result_len, "long long");
158			argument_done = 1;
159			break;
160			case 'y':
161			add_string(result, &result_len, "unsigned long long");
162			argument_done = 1;
163			break;
164			case 'n':
165			add_string(result, &result_len, "__int128");
166			argument_done = 1;
167			break;
168			case 'o':
169			add_string(result, &result_len, "unsigned __int128");
170			argument_done = 1;
171			break;
172			case 'f':
173			add_string(result, &result_len, "float");
174			argument_done = 1;
175			break;
176			case 'd':
177			add_string(result, &result_len, "double");
178			argument_done = 1;
179			break;
180			case 'e':
181			add_string(result, &result_len, "__float80");
182			argument_done = 1;
183			break;
184			case 'g':
185			add_string(result, &result_len, "__float128");
186			argument_done = 1;
187			break;
188			case 'z':
189			add_string(result, &result_len, "...");
190			argument_done = 1;
191			break;
192			case 'P':
193			pointercounter ++;
194			break;
195			case 'R':
196			reference ++;
197			break;
198			case 'v': /* void */
199			break;
200			default:/* Unknown */
201			goto fail;
202			}
203			if (argument_done) {
204			while (pointercounter-- > 0)
205			add_string(result, &result_len, "*");
206			while (reference-- > 0)
207			add_string(result, &result_len, "&");
208			if (*name)
209			add_string(result, &result_len, ",");
210			}
211			type_added = 1;
212			}
213
214			if (type_added)
215			add_string(result, &result_len, "}");
216
217			if (result_len == MAXLEN)
218			goto fail;
219
220			result[result_len] = '\0';
221
222			return result;
223
224			fail:
225			free(result);
226			return NULL;
227			}
228
229
230			/*
231			* symbol_demangle_cplusplus():
232			*
233			* Try to demangle name. If name was not a valid/known C++ symbol, then NULL
234			* is returned. Otherwise, a newly allocated string is returned, containing
235			* the demangled name.
236			*/
237			char symbol_demangle_cplusplus(char name)
238			{
239			/* Only support _Z-style mangled names, for now: */
240			if (strlen(name) < 2 \|\| name[0] != '_' \|\| name[1] != 'Z')
241			return NULL;
242
243			name += 2;
244
245			switch (name[0]) {
246			case 'N':
247			return symbol_demangle_cplusplus_nested(name + 1);
248			break;
249			}
250
251			return NULL;
252			}
253
254
255
256			#ifdef TEST
257
258			void test(char mangled, char result)
259			{
260			char *p = symbol_demangle_cplusplus(mangled);
261			if (p == NULL) {
262			if (result == NULL) {
263			return;
264			} else {
265			printf("FAILURE for %s!\n", mangled);
266			exit(1);
267			}
268			}
269			if (strcmp(p, result) == 0)
270			return;
271			printf("FAILURE for %s! (result = %s)\n", mangled, p);
272			exit(1);
273			}
274
275			int main(int argc, char *argv[])
276			{
277			test("monkey", NULL);
278			test("_monkey", NULL);
279			test("_zmonkey", NULL);
280			test("_Zmonkey", NULL);
281			test("_ZQ5abcde", NULL);
282			test("_ZN3abc5defghE", "abc::defgh");
283			test("_ZN05defghEv", "::defgh{}");
284			test("_ZN5defghEv", "defgh{}");
285			test("_ZN3abc5defghEv", "abc::defgh{}");
286			test("_ZN3abc5defghEc", "abc::defgh{char}");
287			test("_ZN1a2bcEjij", "a::bc{unsigned int,int,unsigned int}");
288			printf("OK\n");
289			return 0;
290			}
291
292			#endif
293