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factor some code into a InstallGlobalCtors method, add comments. No functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23435 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-26 02:31:18 +00:00
parent 7d8e58f384
commit db973e60ce
1 changed files with 62 additions and 45 deletions
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107
lib/Transforms/IPO/GlobalOpt.cpp
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@ -1164,6 +1164,8 @@ GlobalVariable *GlobalOpt::FindGlobalCtors(Module &M) {
return 0;
}
/// ParseGlobalCtors - Given a llvm.global_ctors list that we can understand,
/// return a list of the functions and null terminator as a vector.
static std::vector<Function*> ParseGlobalCtors(GlobalVariable *GV) {
ConstantArray *CA = cast<ConstantArray>(GV->getInitializer());
std::vector<Function*> Result;
@ -1175,6 +1177,65 @@ static std::vector<Function*> ParseGlobalCtors(GlobalVariable *GV) {
return Result;
}
/// InstallGlobalCtors - Given a specified llvm.global_ctors list, install the
/// specified array, returning the new global to use.
static GlobalVariable *InstallGlobalCtors(GlobalVariable *GCL,
const std::vector<Function*> &Ctors) {
// If we made a change, reassemble the initializer list.
std::vector<Constant*> CSVals;
CSVals.push_back(ConstantSInt::get(Type::IntTy, 65535));
CSVals.push_back(0);
// Create the new init list.
std::vector<Constant*> CAList;
for (unsigned i = 0, e = Ctors.size(); i != e; ++i) {
if (Ctors[i])
CSVals[1] = Ctors[i];
else {
const Type *FTy = FunctionType::get(Type::VoidTy,
std::vector<const Type*>(), false);
const PointerType *PFTy = PointerType::get(FTy);
CSVals[1] = Constant::getNullValue(PFTy);
CSVals[0] = ConstantSInt::get(Type::IntTy, 2147483647);
}
CAList.push_back(ConstantStruct::get(CSVals));
}
// Create the array initializer.
const Type *StructTy =
cast<ArrayType>(GCL->getType()->getElementType())->getElementType();
Constant *CA = ConstantArray::get(ArrayType::get(StructTy, CAList.size()),
CAList);
// If we didn't change the number of elements, don't create a new GV.
if (CA->getType() == GCL->getInitializer()->getType()) {
GCL->setInitializer(CA);
return GCL;
}
// Create the new global and insert it next to the existing list.
GlobalVariable *NGV = new GlobalVariable(CA->getType(), GCL->isConstant(),
GCL->getLinkage(), CA,
GCL->getName());
GCL->setName("");
GCL->getParent()->getGlobalList().insert(GCL, NGV);
// Nuke the old list, replacing any uses with the new one.
if (!GCL->use_empty()) {
Constant *V = NGV;
if (V->getType() != GCL->getType())
V = ConstantExpr::getCast(V, GCL->getType());
GCL->replaceAllUsesWith(V);
}
GCL->eraseFromParent();
if (Ctors.size())
return NGV;
else
return 0;
}
/// OptimizeGlobalCtorsList - Simplify and evaluation global ctors if possible.
/// Return true if anything changed.
bool GlobalOpt::OptimizeGlobalCtorsList(GlobalVariable *&GCL) {
@ -1207,51 +1268,7 @@ bool GlobalOpt::OptimizeGlobalCtorsList(GlobalVariable *&GCL) {
if (!MadeChange) return false;
std::vector<Constant*> CSVals;
CSVals.push_back(ConstantSInt::get(Type::IntTy, 65535));
CSVals.push_back(0);
// Create the new init list.
std::vector<Constant*> CAList;
for (unsigned i = 0, e = Ctors.size(); i != e; ++i) {
if (Ctors[i])
CSVals[1] = Ctors[i];
else {
const Type *FTy = FunctionType::get(Type::VoidTy,
std::vector<const Type*>(), false);
const PointerType *PFTy = PointerType::get(FTy);
CSVals[1] = Constant::getNullValue(PFTy);
CSVals[0] = ConstantSInt::get(Type::IntTy, 2147483647);
}
CAList.push_back(ConstantStruct::get(CSVals));
}
// Create the array initializer.
const Type *StructTy =
cast<ArrayType>(GCL->getType()->getElementType())->getElementType();
Constant *CA = ConstantArray::get(ArrayType::get(StructTy, CAList.size()),
CAList);
// Create the new global and insert it next to the existing list.
GlobalVariable *NGV = new GlobalVariable(CA->getType(), GCL->isConstant(),
GCL->getLinkage(), CA,
GCL->getName());
GCL->setName("");
GCL->getParent()->getGlobalList().insert(GCL, NGV);
// Nuke the old list, replacing any uses with the new one.
if (!GCL->use_empty()) {
Constant *V = NGV;
if (V->getType() != GCL->getType())
V = ConstantExpr::getCast(V, GCL->getType());
GCL->replaceAllUsesWith(V);
}
GCL->eraseFromParent();
if (Ctors.size())
GCL = NGV;
else
GCL = 0;
GCL = InstallGlobalCtors(GCL, Ctors);
return true;
}