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Fix for memory leak reported by Valgrind

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If llvm so lib is dlopened and dlclosed several times, then memory leak can be observed, reported by Valgrind.

This patch fixes the issue.

Reviewed By: lattner, dblaikie

Differential Revision: https://reviews.llvm.org/D83372
This commit is contained in:
Maksym Wezdecki 2021-03-16 10:58:30 -07:00 committed by David Blaikie
parent 3be79b1237
commit abe2655fe0
1 changed files with 5 additions and 10 deletions
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15
lib/Support/ManagedStatic.cpp
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@ -18,16 +18,10 @@
using namespace llvm;
static const ManagedStaticBase *StaticList = nullptr;
static std::recursive_mutex *ManagedStaticMutex = nullptr;
static llvm::once_flag mutex_init_flag;
static void initializeMutex() {
ManagedStaticMutex = new std::recursive_mutex();
}
static std::recursive_mutex *getManagedStaticMutex() {
llvm::call_once(mutex_init_flag, initializeMutex);
return ManagedStaticMutex;
static std::recursive_mutex m;
return &m;
}
void ManagedStaticBase::RegisterManagedStatic(void *(*Creator)(),
@ -75,9 +69,10 @@ void ManagedStaticBase::destroy() const {
}
/// llvm_shutdown - Deallocate and destroy all ManagedStatic variables.
/// IMPORTANT: it's only safe to call llvm_shutdown() in single thread,
/// without any other threads executing LLVM APIs.
/// llvm_shutdown() should be the last use of LLVM APIs.
void llvm::llvm_shutdown() {
std::lock_guard<std::recursive_mutex> Lock(*getManagedStaticMutex());
while (StaticList)
StaticList->destroy();
}