1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __PERF_LLVM_C_HELPERS 2 #ifndef __PERF_LLVM_C_HELPERS
3 #define __PERF_LLVM_C_HELPERS 1 3 #define __PERF_LLVM_C_HELPERS 1
4 4
5 /* 5 /*
6 * Helpers to call into LLVM C++ code from C, 6 * Helpers to call into LLVM C++ code from C, for the parts that do not have
7 * C APIs. 7 * C APIs.
8 */ 8 */
9 9
10 #include <linux/compiler.h> 10 #include <linux/compiler.h>
11 11
12 #ifdef __cplusplus 12 #ifdef __cplusplus
13 extern "C" { 13 extern "C" {
14 #endif 14 #endif
15 15
16 struct dso; 16 struct dso;
17 17
18 struct llvm_a2l_frame { 18 struct llvm_a2l_frame {
19 char* filename; 19 char* filename;
20 char* funcname; 20 char* funcname;
21 unsigned int line; 21 unsigned int line;
22 }; 22 };
23 23
24 /* 24 /*
25 * Implement addr2line() using libLLVM. LLVM i 25 * Implement addr2line() using libLLVM. LLVM is a C++ API, and
26 * many of the linux/ headers cannot be includ 26 * many of the linux/ headers cannot be included in a C++ compile unit,
27 * so we need to make a little bridge code her 27 * so we need to make a little bridge code here. llvm_addr2line() will
28 * convert the inline frame information from L 28 * convert the inline frame information from LLVM's internal structures
29 * and put them into a flat array given in inl 29 * and put them into a flat array given in inline_frames. The caller
30 * is then responsible for taking that array a 30 * is then responsible for taking that array and convert it into perf's
31 * regular inline frame structures (which depe 31 * regular inline frame structures (which depend on e.g. struct list_head).
32 * 32 *
33 * If the address could not be resolved, or an 33 * If the address could not be resolved, or an error occurred (e.g. OOM),
34 * returns 0. Otherwise, returns the number of 34 * returns 0. Otherwise, returns the number of inline frames (which means 1
35 * if the address was not part of an inlined f 35 * if the address was not part of an inlined function). If unwind_inlines
36 * is set and the return code is nonzero, inli 36 * is set and the return code is nonzero, inline_frames will be set to
37 * a newly allocated array with that length. T 37 * a newly allocated array with that length. The caller is then responsible
38 * for freeing both the strings and the array 38 * for freeing both the strings and the array itself.
39 */ 39 */
40 int llvm_addr2line(const char* dso_name, 40 int llvm_addr2line(const char* dso_name,
41 u64 addr, 41 u64 addr,
42 char** file, 42 char** file,
43 unsigned int* line, 43 unsigned int* line,
44 bool unwind_inlines, 44 bool unwind_inlines,
45 struct llvm_a2l_frame** inl 45 struct llvm_a2l_frame** inline_frames);
46 46
47 /* 47 /*
48 * Simple symbolizers for addresses; will conv 48 * Simple symbolizers for addresses; will convert something like
49 * 0x12345 to "func+0x123". Will return NULL i 49 * 0x12345 to "func+0x123". Will return NULL if no symbol was found.
50 * 50 *
51 * The returned value must be freed by the cal 51 * The returned value must be freed by the caller, with free().
52 */ 52 */
53 char *llvm_name_for_code(struct dso *dso, cons 53 char *llvm_name_for_code(struct dso *dso, const char *dso_name, u64 addr);
54 char *llvm_name_for_data(struct dso *dso, cons 54 char *llvm_name_for_data(struct dso *dso, const char *dso_name, u64 addr);
55 55
56 #ifdef __cplusplus 56 #ifdef __cplusplus
57 } 57 }
58 #endif 58 #endif
59 59
60 #endif /* __PERF_LLVM_C_HELPERS */ 60 #endif /* __PERF_LLVM_C_HELPERS */
61 61
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