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Change CALL_ONCE_INITIALIZATION implementation to use static initialization #4818

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Change CALL_ONCE_INITIALIZATION implementation to use static initialization #4818

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25 changes: 6 additions & 19 deletions include/llvm/PassSupport.h
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Original file line number Diff line number Diff line change
Expand Up @@ -33,25 +33,12 @@ namespace llvm {

class TargetMachine;

#define CALL_ONCE_INITIALIZATION(function) \
static volatile sys::cas_flag initialized = 0; \
sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
if (old_val == 0) { \
function(Registry); \
sys::MemoryFence(); \
TsanIgnoreWritesBegin(); \
TsanHappensBefore(&initialized); \
initialized = 2; \
TsanIgnoreWritesEnd(); \
} else { \
sys::cas_flag tmp = initialized; \
sys::MemoryFence(); \
while (tmp != 2) { \
tmp = initialized; \
sys::MemoryFence(); \
} \
} \
TsanHappensAfter(&initialized);
#define CALL_ONCE_INITIALIZATION(function) \
static bool initialized_once = [&] { \
function(Registry); \
return true; \
}(); \
(void) initialized_once;

#define INITIALIZE_PASS(passName, arg, name, cfg, analysis) \
static void* initialize##passName##PassOnce(PassRegistry &Registry) { \
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