forked from OSchip/llvm-project
Try again at implementing thread-safe lazy pass initialization, without depending on static local initialization
being threadsafe AND ensuring that initialization is complete by the time the initializeFooPass method returns. llvm-svn: 116492
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@ -24,7 +24,7 @@
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#include "Pass.h"
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#include "llvm/PassRegistry.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/System/Atomic.h"
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#include <vector>
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namespace llvm {
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@ -137,8 +137,20 @@ private:
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return PI; \
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} \
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void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
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ATTRIBUTE_USED \
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static void* initialized = initialize##passName##PassOnce(Registry); \
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static volatile sys::cas_flag initialized = 0; \
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sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
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if (old_val == 0) { \
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initialize##passName##PassOnce(Registry); \
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sys::MemoryFence(); \
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initialized = 2; \
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} else { \
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sys::cas_flag tmp = initialized; \
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sys::MemoryFence(); \
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while (tmp != 2) { \
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tmp = initialized; \
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sys::MemoryFence(); \
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} \
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} \
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} \
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static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis);
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@ -157,8 +169,20 @@ private:
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return PI; \
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} \
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void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
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ATTRIBUTE_USED \
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static void* initialized = initialize##passName##PassOnce(Registry); \
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static volatile sys::cas_flag initialized = 0; \
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sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
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if (old_val == 0) { \
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initialize##passName##PassOnce(Registry); \
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sys::MemoryFence(); \
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initialized = 2; \
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} else { \
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sys::cas_flag tmp = initialized; \
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sys::MemoryFence(); \
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while (tmp != 2) { \
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tmp = initialized; \
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sys::MemoryFence(); \
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} \
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} \
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} \
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static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis);
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@ -244,11 +268,24 @@ struct RegisterAnalysisGroup : public RegisterAGBase {
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return AI; \
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} \
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void llvm::initialize##agName##AnalysisGroup(PassRegistry &Registry) { \
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ATTRIBUTE_USED static void* initialized = \
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static volatile sys::cas_flag initialized = 0; \
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sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
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if (old_val == 0) { \
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initialize##agName##AnalysisGroupOnce(Registry); \
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sys::MemoryFence(); \
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initialized = 2; \
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} else { \
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sys::cas_flag tmp = initialized; \
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sys::MemoryFence(); \
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while (tmp != 2) { \
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tmp = initialized; \
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sys::MemoryFence(); \
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} \
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} \
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} \
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static RegisterAnalysisGroup<agName> agName##_info (name);
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#define INITIALIZE_AG_PASS(passName, agName, arg, name, cfg, analysis, def) \
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static void* initialize##passName##PassOnce(PassRegistry &Registry) { \
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PassInfo *PI = new PassInfo(name, arg, & passName ::ID, \
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@ -260,12 +297,25 @@ struct RegisterAnalysisGroup : public RegisterAGBase {
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return AI; \
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} \
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void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
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ATTRIBUTE_USED \
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static void* initialized = initialize##passName##PassOnce(Registry); \
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static volatile sys::cas_flag initialized = 0; \
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sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
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if (old_val == 0) { \
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initialize##passName##PassOnce(Registry); \
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sys::MemoryFence(); \
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initialized = 2; \
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} else { \
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sys::cas_flag tmp = initialized; \
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sys::MemoryFence(); \
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while (tmp != 2) { \
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tmp = initialized; \
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sys::MemoryFence(); \
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} \
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} \
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} \
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static RegisterPass<passName> passName ## _info(arg, name, cfg, analysis); \
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static RegisterAnalysisGroup<agName, def> passName ## _ag(passName ## _info);
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#define INITIALIZE_AG_PASS_BEGIN(passName, agName, arg, n, cfg, analysis, def) \
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static void* initialize##passName##PassOnce(PassRegistry &Registry) {
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@ -279,8 +329,20 @@ struct RegisterAnalysisGroup : public RegisterAGBase {
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return AI; \
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} \
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void llvm::initialize##passName##Pass(PassRegistry &Registry) { \
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ATTRIBUTE_USED \
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static void* initialized = initialize##passName##PassOnce(Registry); \
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static volatile sys::cas_flag initialized = 0; \
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sys::cas_flag old_val = sys::CompareAndSwap(&initialized, 1, 0); \
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if (old_val == 0) { \
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initialize##passName##PassOnce(Registry); \
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sys::MemoryFence(); \
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initialized = 2; \
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} else { \
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sys::cas_flag tmp = initialized; \
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sys::MemoryFence(); \
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while (tmp != 2) { \
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tmp = initialized; \
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sys::MemoryFence(); \
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} \
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} \
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} \
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static RegisterPass<passName> passName ## _info(arg, n, cfg, analysis); \
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static RegisterAnalysisGroup<agName, def> passName ## _ag(passName ## _info);
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