6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-28 06:24:57 +00:00
Code Issues Projects Releases Wiki Activity

llvm.global_[cd]tor is defined to be either external, or appending with an array

Browse Source 
of { i32, void ()* }. Teach the verifier to verify that, deleting copies of
checks strewn about.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129128 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2011-04-08 07:30:21 +00:00
parent dd099e1e55
commit 2c44a80d99
4 changed files with 32 additions and 36 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
lib/Transforms/IPO/GlobalOpt.cpp
View File

@ -1944,35 +1944,20 @@ bool GlobalOpt::OptimizeGlobalVars(Module &M) {
return Changed;
}
/// FindGlobalCtors - Find the llvm.globalctors list, verifying that all
/// FindGlobalCtors - Find the llvm.global_ctors list, verifying that all
/// initializers have an init priority of 65535.
GlobalVariable *GlobalOpt::FindGlobalCtors(Module &M) {
GlobalVariable *GV = M.getGlobalVariable("llvm.global_ctors");
if (GV == 0) return 0;
// Found it, verify it's an array of { int, void()* }.
const ArrayType *ATy =dyn_cast<ArrayType>(GV->getType()->getElementType());
if (!ATy) return 0;
const StructType *STy = dyn_cast<StructType>(ATy->getElementType());
if (!STy || STy->getNumElements() != 2 ||
!STy->getElementType(0)->isIntegerTy(32)) return 0;
const PointerType *PFTy = dyn_cast<PointerType>(STy->getElementType(1));
if (!PFTy) return 0;
const FunctionType *FTy = dyn_cast<FunctionType>(PFTy->getElementType());
if (!FTy || !FTy->getReturnType()->isVoidTy() ||
FTy->isVarArg() || FTy->getNumParams() != 0)
return 0;
// Verify that the initializer is simple enough for us to handle. We are
// only allowed to optimize the initializer if it is unique.
if (!GV->hasUniqueInitializer()) return 0;
ConstantArray *CA = dyn_cast<ConstantArray>(GV->getInitializer());
if (!CA) return 0;
ConstantArray *CA = cast<ConstantArray>(GV->getInitializer());
for (User::op_iterator i = CA->op_begin(), e = CA->op_end(); i != e; ++i) {
ConstantStruct *CS = dyn_cast<ConstantStruct>(*i);
if (CS == 0) return 0;
ConstantStruct *CS = cast<ConstantStruct>(*i);
if (isa<ConstantPointerNull>(CS->getOperand(1)))
continue;
@ -1982,8 +1967,8 @@ GlobalVariable *GlobalOpt::FindGlobalCtors(Module &M) {
return 0;
// Init priority must be standard.
ConstantInt *CI = dyn_cast<ConstantInt>(CS->getOperand(0));
if (!CI || CI->getZExtValue() != 65535)
ConstantInt *CI = cast<ConstantInt>(CS->getOperand(0));
if (CI->getZExtValue() != 65535)
return 0;
}