61 lines
1.9 KiB
C
61 lines
1.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __PERF_LLVM_C_HELPERS
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#define __PERF_LLVM_C_HELPERS 1
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/*
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* Helpers to call into LLVM C++ code from C, for the parts that do not have
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* C APIs.
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*/
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#include <linux/compiler.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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struct dso;
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struct llvm_a2l_frame {
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char* filename;
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char* funcname;
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unsigned int line;
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};
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/*
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* Implement addr2line() using libLLVM. LLVM is a C++ API, and
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* many of the linux/ headers cannot be included in a C++ compile unit,
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* so we need to make a little bridge code here. llvm_addr2line() will
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* convert the inline frame information from LLVM's internal structures
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* and put them into a flat array given in inline_frames. The caller
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* is then responsible for taking that array and convert it into perf's
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* regular inline frame structures (which depend on e.g. struct list_head).
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*
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* If the address could not be resolved, or an error occurred (e.g. OOM),
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* returns 0. Otherwise, returns the number of inline frames (which means 1
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* if the address was not part of an inlined function). If unwind_inlines
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* is set and the return code is nonzero, inline_frames will be set to
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* a newly allocated array with that length. The caller is then responsible
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* for freeing both the strings and the array itself.
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*/
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int llvm_addr2line(const char* dso_name,
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u64 addr,
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char** file,
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unsigned int* line,
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bool unwind_inlines,
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struct llvm_a2l_frame** inline_frames);
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/*
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* Simple symbolizers for addresses; will convert something like
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* 0x12345 to "func+0x123". Will return NULL if no symbol was found.
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*
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* The returned value must be freed by the caller, with free().
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*/
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char *llvm_name_for_code(struct dso *dso, const char *dso_name, u64 addr);
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char *llvm_name_for_data(struct dso *dso, const char *dso_name, u64 addr);
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#ifdef __cplusplus
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}
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#endif
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#endif /* __PERF_LLVM_C_HELPERS */
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