77 lines
2.6 KiB
C
77 lines
2.6 KiB
C
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#include "sentry_symbolizer.h"
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#include "sentry_testsupport.h"
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#define MAX_FRAMES 128
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TEST_VISIBLE size_t
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invoke_unwinder(void **backtrace)
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{
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// capture a stacktrace from within this function, which means that the
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// trace will include a frame of this very function that we will test
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// against.
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size_t frame_count = sentry_unwind_stack(NULL, backtrace, MAX_FRAMES);
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// this assertion here makes sure the function is not inlined.
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TEST_CHECK(frame_count > 0);
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return frame_count;
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}
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static void
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find_frame(const sentry_frame_info_t *info, void *data)
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{
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int *found_frame = data;
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// we will specifically check for the unwinder function
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void *unwinder_address =
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#if defined(SENTRY_PLATFORM_AIX)
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// AIX and ELFv1 SystemV ABI use function descriptors (a struct
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// containing the pointers required to invoke). We need to dereference
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// again to get the actual reference to code.
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// XXX: Should apply on _CALL_ELF == 1 when on PowerPC i.e. Linux
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*(void **)&invoke_unwinder;
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#else
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&invoke_unwinder;
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#endif
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if (info->symbol_addr == unwinder_address) {
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*found_frame += 1;
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}
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}
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SENTRY_TEST(unwinder)
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{
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void *backtrace1[MAX_FRAMES] = { 0 };
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size_t frame_count1 = invoke_unwinder(backtrace1);
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size_t invoker_frame = 0;
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int found_frame = 0;
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for (size_t i = 0; i < frame_count1; i++) {
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// symbolize the frame, which also resolves an arbitrary instruction
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// address back to a function, and check if we found our invoker
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sentry__symbolize(backtrace1[i], find_frame, &found_frame);
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if (found_frame) {
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invoker_frame = i;
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}
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}
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TEST_CHECK_INT_EQUAL(found_frame, 1);
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// the backtrace should have:
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// X. something internal to sentry and the unwinder
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// 2. the `invoke_unwinder` function
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// 3. this test function here
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// 4. whatever parent called that test function, which should have a stable
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// instruction pointer as long as we don’t return from here.
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size_t offset = invoker_frame + 2;
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if (frame_count1 >= offset) {
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void *backtrace2[MAX_FRAMES] = { 0 };
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size_t frame_count2
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= sentry_unwind_stack(backtrace1[offset], backtrace2, MAX_FRAMES);
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// we only have this functionality on some platforms / unwinders
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if (frame_count2 > 0) {
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TEST_CHECK_INT_EQUAL(frame_count2, frame_count1 - offset);
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for (size_t i = 0; i < frame_count2; i++) {
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TEST_CHECK_INT_EQUAL(backtrace2[i], backtrace1[offset + i]);
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}
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}
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}
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}
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