bool RegisterGlobals::runOnModule(Module &M) {
TD = &getAnalysis<TargetData>();
VoidTy = Type::getVoidTy(M.getContext());
VoidPtrTy = Type::getInt8PtrTy(M.getContext());
SizeTy = IntegerType::getInt64Ty(M.getContext());
// Create the function prototype
M.getOrInsertFunction("__pool_register_global", VoidTy, VoidPtrTy, SizeTy,
NULL);
RegisterGlobalPoolFunction = M.getFunction("__pool_register_global");
// Create the function that will contain the registration calls
createRegistrationFunction(M);
Module::global_iterator GI = M.global_begin(), GE = M.global_end();
for ( ; GI != GE; ++GI) {
GlobalVariable *GV = GI;
// Skip globals without a size
if (!GV->getType()->getElementType()->isSized())
continue;
// Optionally avoid registering globals with uncertain size.
if (!RegUncertain) {
// Linking can change the size of declarations
if (GV->isDeclaration())
continue;
// Linking can't change the size of defined globals with eternal linkage.
// Linking can't change the size of globals with local linkage.
if (!GV->hasExternalLinkage() && !GV->hasLocalLinkage())
continue;
}
// Thread-local globals would have to be registered for each thread.
// FIXME: add support for thread-local globals
if (GV->isThreadLocal())
continue;
registerGlobal(GV);
}
return true;
}
