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Use the existing build configuration parameter ENABLE_BACKTRACE to compile out all pretty stack trace support when backtraces are disabled. 

This has the nice secondary effect of allowing LLVM to continue to build
for targets without __thread or thread_local support to continue to work
so long as they build without support for backtraces.

llvm-svn: 227423
This commit is contained in:
Owen Anderson 2015-01-29 07:35:31 +00:00
parent 99cd1fb012
commit 9253bb933a
1 changed files with 16 additions and 0 deletions
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16
llvm/lib/Support/PrettyStackTrace.cpp
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@ -27,6 +27,11 @@
using namespace llvm;
// If backtrace support is not enabled, compile out support for pretty stack
// traces. This has the secondary effect of not requiring thread local storage
// when backtrace support is disabled.
#if ENABLE_BACKTRACE
// We need a thread local pointer to manage the stack of our stack trace
// objects, but we *really* cannot tolerate destructors running and do not want
// to pay any overhead of synchronizing. As a consequence, we use a raw
@ -103,16 +108,23 @@ static void CrashHandler(void *) {
#endif
}
// ENABLE_BACKTRACE
#endif
PrettyStackTraceEntry::PrettyStackTraceEntry() {
#if ENABLE_BACKTRACE
// Link ourselves.
NextEntry = PrettyStackTraceHead;
PrettyStackTraceHead = this;
#endif
}
PrettyStackTraceEntry::~PrettyStackTraceEntry() {
#if ENABLE_BACKTRACE
assert(PrettyStackTraceHead == this &&
"Pretty stack trace entry destruction is out of order");
PrettyStackTraceHead = getNextEntry();
#endif
}
void PrettyStackTraceString::print(raw_ostream &OS) const {
@ -127,15 +139,19 @@ void PrettyStackTraceProgram::print(raw_ostream &OS) const {
OS << '\n';
}
#if ENABLE_BACKTRACE
static bool RegisterCrashPrinter() {
sys::AddSignalHandler(CrashHandler, nullptr);
return false;
}
#endif
void llvm::EnablePrettyStackTrace() {
#if ENABLE_BACKTRACE
// The first time this is called, we register the crash printer.
static bool HandlerRegistered = RegisterCrashPrinter();
(void)HandlerRegistered;
#endif
}
void LLVMEnablePrettyStackTrace() {