![Stephane Eranian](/assets/img/avatar_default.png)
Add Java function descriptor demangling support. Something bfd cannot do. Use the JAVA_DEMANGLE_NORET flag to avoid decoding the return type of functions. Signed-off-by: Stephane Eranian <eranian@google.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Carl Love <cel@us.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: John McCutchan <johnmccutchan@google.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Pawel Moll <pawel.moll@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sonny Rao <sonnyrao@chromium.org> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1448874143-7269-2-git-send-email-eranian@google.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
200 lines
4.1 KiB
C
200 lines
4.1 KiB
C
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "util.h"
|
|
#include "debug.h"
|
|
#include "symbol.h"
|
|
|
|
#include "demangle-java.h"
|
|
|
|
enum {
|
|
MODE_PREFIX = 0,
|
|
MODE_CLASS = 1,
|
|
MODE_FUNC = 2,
|
|
MODE_TYPE = 3,
|
|
MODE_CTYPE = 3, /* 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', "bool" ),
|
|
};
|
|
|
|
/*
|
|
* 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_CTYPE) {
|
|
if (mode == MODE_CTYPE) {
|
|
if (narg)
|
|
rlen += scnprintf(buf + rlen, maxlen - rlen, ", ");
|
|
narg++;
|
|
}
|
|
rlen += scnprintf(buf + rlen, maxlen - rlen, "class ");
|
|
if (mode == MODE_PREFIX)
|
|
mode = MODE_CLASS;
|
|
} 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)))
|
|
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: comobination 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 retunr 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;
|
|
}
|