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Add support for libbacktrace to detect new elfs have been dynamically loaded after backtrace_initialize() has been called, and consider them for symbol resolution

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trodrigues 2023-12-05 20:09:11 -06:00
parent 55f53b9979
commit b835d73590
4 changed files with 7624 additions and 7500 deletions
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1
CMakeLists.txt
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@ -86,6 +86,7 @@ set_option(TRACY_NO_CRASH_HANDLER "Disable crash handling" OFF)
set_option(TRACY_TIMER_FALLBACK "Use lower resolution timers" OFF)
set_option(TRACE_CLIENT_LIBUNWIND_BACKTRACE "Use libunwind backtracing where supported" OFF)
set_option(TRACY_SYMBOL_OFFLINE_RESOLVE "Instead of full runtime symbol resolution, only resolve the image path and offset to enable offline symbol resolution" OFF)
set_option(TRACY_LIBBACKTRACE_ELF_DYNLOAD_SUPPORT "Enable libbacktrace to support dynamically loaded elfs in symbol resolution resolution after the first symbol resolve operation" OFF)
if(NOT TRACY_STATIC)
target_compile_definitions(TracyClient PRIVATE TRACY_EXPORTS)

41
public/libbacktrace/dwarf.cpp
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@ -4251,6 +4251,19 @@ dwarf_lookup_pc (struct backtrace_state *state, struct dwarf_data *ddata,
}
}
bool dwarf_fileline_dwarf_lookup_pc_in_all_entries(struct backtrace_state *state, uintptr_t pc,
backtrace_full_callback callback, backtrace_error_callback error_callback, void *data,
int& found, int ret)
{
for (struct dwarf_data* ddata = (struct dwarf_data *)state->fileline_data;
ddata != NULL;
ddata = ddata->next)
{
ret = dwarf_lookup_pc(state, ddata, pc, callback, error_callback, data, &found);
if (ret != 0 || found) return true;
}
return false;
}
/* Return the file/line information for a PC using the DWARF mapping
we built earlier. */
@ -4265,17 +4278,27 @@ dwarf_fileline (struct backtrace_state *state, uintptr_t pc,
int ret;
if (!state->threaded)
{
if (dwarf_fileline_dwarf_lookup_pc_in_all_entries(state, pc, callback, error_callback, data, found, ret))
{
for (ddata = (struct dwarf_data *) state->fileline_data;
ddata != NULL;
ddata = ddata->next)
{
ret = dwarf_lookup_pc (state, ddata, pc, callback, error_callback,
data, &found);
if (ret != 0 || found)
return ret;
}
return ret;
}
// if we failed to obtain an entry in range, it can mean that the address map has been cahnges and new entries
// have been loaded in the meantime. Request a refresh and try again
if (state->request_known_address_ranges_refresh_fn)
{
int new_range_count = state->request_known_address_ranges_refresh_fn(state, pc);
if (new_range_count > 0)
{
if (dwarf_fileline_dwarf_lookup_pc_in_all_entries(state, pc, callback, error_callback, data, found, ret))
{
return ret;
}
}
}
}
else
{
struct dwarf_data **pp;

15075
public/libbacktrace/elf.cpp
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File diff suppressed because it is too large Load Diff

7
public/libbacktrace/internal.hpp
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@ -133,6 +133,11 @@ typedef void (*syminfo) (struct backtrace_state *state, uintptr_t pc,
backtrace_syminfo_callback callback,
backtrace_error_callback error_callback, void *data);
/* The type of the function that will trigger an known address range refresh
(if pc passed in is for an address whichs lies ourtisde of known ranges) */
typedef int (*request_known_address_ranges_refresh)(struct backtrace_state *state,
uintptr_t pc);
/* What the backtrace state pointer points to. */
struct backtrace_state
@ -159,6 +164,8 @@ struct backtrace_state
int lock_alloc;
/* The freelist when using mmap. */
struct backtrace_freelist_struct *freelist;
/* Trigger an known address range refresh */
request_known_address_ranges_refresh request_known_address_ranges_refresh_fn;
};
/* Open a file for reading. Returns -1 on error. If DOES_NOT_EXIST