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[Backtracing] Add a caching wrapper for MemoryReader. #69610

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[Backtracing] Add a caching wrapper for MemoryReader. #69610

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3a96c5f
[Linux] Disable fatalError() backtraces when the runtime backtracer i…
al45tair Oct 31, 2023
287c1d7
[Backtracing] Disable backtracer for Runtime/backtrace test.
al45tair Nov 1, 2023
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4 changes: 4 additions & 0 deletions include/swift/Runtime/Backtrace.h
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Original file line number Diff line number Diff line change
Expand Up @@ -135,6 +135,10 @@ struct BacktraceSettings {

SWIFT_RUNTIME_STDLIB_INTERNAL BacktraceSettings _swift_backtraceSettings;

inline bool _swift_backtrace_isEnabled() {
return _swift_backtraceSettings.enabled == OnOffTty::On;
}

SWIFT_RUNTIME_STDLIB_SPI
bool _swift_backtrace_isThunkFunction(const char *mangledName);

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11 changes: 9 additions & 2 deletions stdlib/public/runtime/Errors.cpp
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Expand Up @@ -34,6 +34,7 @@

#include "ImageInspection.h"
#include "swift/Demangling/Demangle.h"
#include "swift/Runtime/Backtrace.h"
#include "swift/Runtime/Debug.h"
#include "swift/Runtime/Portability.h"
#include "swift/Runtime/Win32.h"
Expand Down Expand Up @@ -353,7 +354,13 @@ void swift::swift_reportError(uint32_t flags,
const char *message) {
#if defined(__APPLE__) && NDEBUG
flags &= ~FatalErrorFlags::ReportBacktrace;
#else
// Disable fatalError backtraces if the backtracer is enabled
if (runtime::backtrace::_swift_backtrace_isEnabled()) {
flags &= ~FatalErrorFlags::ReportBacktrace;
}
#endif

reportNow(flags, message);
reportOnCrash(flags, message);
}
Expand Down Expand Up @@ -388,9 +395,9 @@ swift::warningv(uint32_t flags, const char *format, va_list args)
#pragma GCC diagnostic ignored "-Wuninitialized"
swift_vasprintf(&log, format, args);
#pragma GCC diagnostic pop

reportNow(flags, log);

free(log);
}

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2 changes: 2 additions & 0 deletions test/Backtracing/FatalError.swift
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Expand Up @@ -37,6 +37,8 @@ struct FatalError {
}
}

// CHECK-NOT: Current stack trace:

// CHECK: *** Program crashed: {{Illegal instruction|System trap}} at 0x{{[0-9a-f]+}} ***

// CHECK: Thread 0 {{(".*" )?}}crashed:
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2 changes: 1 addition & 1 deletion test/Runtime/backtrace.swift
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@@ -1,6 +1,6 @@
// RUN: %empty-directory(%t)
// RUN: %target-build-swift %s -o %t/a.out
// RUN: %{python} %S/../Inputs/not.py "%target-run %t/a.out" 2>&1 | %{python} %utils/backtrace-check
// RUN: env SWIFT_BACKTRACE=enable=no %{python} %S/../Inputs/not.py "%target-run %t/a.out" 2>&1 | %{python} %utils/backtrace-check

// NOTE: not.py is used above instead of "not --crash" because %target-run
// doesn't pass through the crash, and `not` may not be available when running
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