probe-finder.c (f1bbbb6912662b9f6070c5bfc4ca9eb1f06a9d5b) probe-finder.c (9ed7e1b85cd55dc46cb9410a23086bdaa2ff3eb9)
1/*
2 * probe-finder.c : C expression to kprobe event converter
3 *
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or

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32#include <stdarg.h>
33#include <ctype.h>
34#include <dwarf-regs.h>
35
36#include "string.h"
37#include "event.h"
38#include "debug.h"
39#include "util.h"
1/*
2 * probe-finder.c : C expression to kprobe event converter
3 *
4 * Written by Masami Hiramatsu <mhiramat@redhat.com>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or

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32#include <stdarg.h>
33#include <ctype.h>
34#include <dwarf-regs.h>
35
36#include "string.h"
37#include "event.h"
38#include "debug.h"
39#include "util.h"
40#include "symbol.h"
40#include "probe-finder.h"
41
42/* Kprobe tracer basic type is up to u64 */
43#define MAX_BASIC_TYPE_BITS 64
44
45/*
46 * Compare the tail of two strings.
47 * Return 0 if whole of either string is same as another's tail part.

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52 int i2 = strlen(s2);
53 while (--i1 >= 0 && --i2 >= 0) {
54 if (s1[i1] != s2[i2])
55 return s1[i1] - s2[i2];
56 }
57 return 0;
58}
59
41#include "probe-finder.h"
42
43/* Kprobe tracer basic type is up to u64 */
44#define MAX_BASIC_TYPE_BITS 64
45
46/*
47 * Compare the tail of two strings.
48 * Return 0 if whole of either string is same as another's tail part.

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53 int i2 = strlen(s2);
54 while (--i1 >= 0 && --i2 >= 0) {
55 if (s1[i1] != s2[i2])
56 return s1[i1] - s2[i2];
57 }
58 return 0;
59}
60
61/*
62 * Find a src file from a DWARF tag path. Prepend optional source path prefix
63 * and chop off leading directories that do not exist. Result is passed back as
64 * a newly allocated path on success.
65 * Return 0 if file was found and readable, -errno otherwise.
66 */
67static int get_real_path(const char *raw_path, char **new_path)
68{
69 if (!symbol_conf.source_prefix) {
70 if (access(raw_path, R_OK) == 0) {
71 *new_path = strdup(raw_path);
72 return 0;
73 } else
74 return -errno;
75 }
76
77 *new_path = malloc((strlen(symbol_conf.source_prefix) +
78 strlen(raw_path) + 2));
79 if (!*new_path)
80 return -ENOMEM;
81
82 for (;;) {
83 sprintf(*new_path, "%s/%s", symbol_conf.source_prefix,
84 raw_path);
85
86 if (access(*new_path, R_OK) == 0)
87 return 0;
88
89 switch (errno) {
90 case ENAMETOOLONG:
91 case ENOENT:
92 case EROFS:
93 case EFAULT:
94 raw_path = strchr(++raw_path, '/');
95 if (!raw_path) {
96 free(*new_path);
97 *new_path = NULL;
98 return -ENOENT;
99 }
100 continue;
101
102 default:
103 free(*new_path);
104 *new_path = NULL;
105 return -errno;
106 }
107 }
108}
109
60/* Line number list operations */
61
62/* Add a line to line number list */
63static int line_list__add_line(struct list_head *head, int line)
64{
65 struct line_node *ln;
66 struct list_head *p;
67

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1091 ret = found ? 1 : 0;
1092 return ret;
1093}
1094
1095/* Add a line and store the src path */
1096static int line_range_add_line(const char *src, unsigned int lineno,
1097 struct line_range *lr)
1098{
110/* Line number list operations */
111
112/* Add a line to line number list */
113static int line_list__add_line(struct list_head *head, int line)
114{
115 struct line_node *ln;
116 struct list_head *p;
117

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1141 ret = found ? 1 : 0;
1142 return ret;
1143}
1144
1145/* Add a line and store the src path */
1146static int line_range_add_line(const char *src, unsigned int lineno,
1147 struct line_range *lr)
1148{
1149 int ret;
1150
1099 /* Copy real path */
1100 if (!lr->path) {
1151 /* Copy real path */
1152 if (!lr->path) {
1101 lr->path = strdup(src);
1102 if (lr->path == NULL)
1103 return -ENOMEM;
1153 ret = get_real_path(src, &lr->path);
1154 if (ret != 0)
1155 return ret;
1104 }
1105 return line_list__add_line(&lr->line_list, lineno);
1106}
1107
1108/* Search function declaration lines */
1109static int line_range_funcdecl_cb(Dwarf_Die *sp_die, void *data)
1110{
1111 struct dwarf_callback_param *param = data;

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1157 return line_list__add_line(&lr->line_list, lineno);
1158}
1159
1160/* Search function declaration lines */
1161static int line_range_funcdecl_cb(Dwarf_Die *sp_die, void *data)
1162{
1163 struct dwarf_callback_param *param = data;

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