aa649ff48f
Summary: `/*` is the standard throughout open source code. For example, Firefox uses single /*: https://hg.mozilla.org/mozilla-central/file/21d22b2f541258d3d1cf96c7ba5ad73e96e616b5/gfx/ipc/CompositorWidgetVsyncObserver.cpp#l3 In addition, Rust considers `/**` to be a doc comment (similar to Javadoc) and having such a comment at the beginning of the file causes `rustc` to barf. Note that some JavaScript tooling requires `/**`. This is OK since JavaScript files were not covered by the linter in the first place, but it would be good to have that tooling fixed too. Reviewed By: zertosh Differential Revision: D15640366 fbshipit-source-id: b4ed4599071516364d6109720750d6a43304c089
64 lines
1.5 KiB
C++
64 lines
1.5 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the LICENSE
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* file in the root directory of this source tree.
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*/
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#if FB_SONARKIT_ENABLED
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#include <dlfcn.h>
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#include <unwind.h>
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#include <iomanip>
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namespace facebook {
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namespace flipper {
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// TODO: T39093653, Replace the backtrace implementation with folly
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// implementation. Didn't use the backtrace() c function as it was not found in
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// NDK.
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struct BacktraceState {
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void** current;
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void** end;
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};
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static _Unwind_Reason_Code unwindCallback(
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struct _Unwind_Context* context,
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void* arg) {
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BacktraceState* state = static_cast<BacktraceState*>(arg);
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uintptr_t pc = _Unwind_GetIP(context);
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if (pc) {
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if (state->current == state->end) {
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return _URC_END_OF_STACK;
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} else {
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*state->current++ = reinterpret_cast<void*>(pc);
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}
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}
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return _URC_NO_REASON;
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}
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static size_t captureBacktrace(void** buffer, size_t max) {
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BacktraceState state = {buffer, buffer + max};
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_Unwind_Backtrace(unwindCallback, &state);
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return state.current - buffer;
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}
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static void dumpBacktrace(std::ostream& os, void** buffer, size_t count) {
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for (size_t idx = 0; idx < count; ++idx) {
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const void* addr = buffer[idx];
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const char* symbol = "";
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Dl_info info;
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if (dladdr(addr, &info) && info.dli_sname) {
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symbol = info.dli_sname;
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}
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os << " #" << std::setw(2) << idx << ": " << addr << " " << symbol
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<< "\n";
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}
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}
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} // namespace flipper
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} // namespace facebook
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#endif
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