mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-08-27 15:29:51 +00:00
56 lines
2.0 KiB
C++
56 lines
2.0 KiB
C++
|
//===-- ModuleUtils.cpp - Functions to manipulate Modules -----------------===//
|
||
|
//
|
||
|
// The LLVM Compiler Infrastructure
|
||
|
//
|
||
|
// This file is distributed under the University of Illinois Open Source
|
||
|
// License. See LICENSE.TXT for details.
|
||
|
//
|
||
|
//===----------------------------------------------------------------------===//
|
||
|
//
|
||
|
// This family of functions perform manipulations on Modules.
|
||
|
//
|
||
|
//===----------------------------------------------------------------------===//
|
||
|
|
||
|
#include "llvm/Transforms/Utils/ModuleUtils.h"
|
||
|
#include "llvm/DerivedTypes.h"
|
||
|
#include "llvm/Function.h"
|
||
|
#include "llvm/Module.h"
|
||
|
#include "llvm/Support/IRBuilder.h"
|
||
|
using namespace llvm;
|
||
|
|
||
|
void llvm::appendToGlobalCtors(Module &M, Function *F, int Priority) {
|
||
|
IRBuilder<> IRB(M.getContext());
|
||
|
FunctionType *FnTy = FunctionType::get(IRB.getVoidTy(), false);
|
||
|
StructType *Ty = StructType::get(
|
||
|
IRB.getInt32Ty(), PointerType::getUnqual(FnTy), NULL);
|
||
|
|
||
|
Constant *RuntimeCtorInit = ConstantStruct::get(
|
||
|
Ty, IRB.getInt32(Priority), F, NULL);
|
||
|
|
||
|
// Get the current set of static global constructors and add the new ctor
|
||
|
// to the list.
|
||
|
SmallVector<Constant *, 16> CurrentCtors;
|
||
|
if (GlobalVariable * GVCtor = M.getNamedGlobal("llvm.global_ctors")) {
|
||
|
if (Constant *Init = GVCtor->getInitializer()) {
|
||
|
unsigned n = Init->getNumOperands();
|
||
|
CurrentCtors.reserve(n + 1);
|
||
|
for (unsigned i = 0; i != n; ++i)
|
||
|
CurrentCtors.push_back(cast<Constant>(Init->getOperand(i)));
|
||
|
}
|
||
|
GVCtor->eraseFromParent();
|
||
|
}
|
||
|
|
||
|
CurrentCtors.push_back(RuntimeCtorInit);
|
||
|
|
||
|
// Create a new initializer.
|
||
|
ArrayType *AT = ArrayType::get(RuntimeCtorInit->getType(),
|
||
|
CurrentCtors.size());
|
||
|
Constant *NewInit = ConstantArray::get(AT, CurrentCtors);
|
||
|
|
||
|
// Create the new global variable and replace all uses of
|
||
|
// the old global variable with the new one.
|
||
|
(void)new GlobalVariable(M, NewInit->getType(), false,
|
||
|
GlobalValue::AppendingLinkage, NewInit,
|
||
|
"llvm.global_ctors");
|
||
|
}
|