[cfe-dev] Create a BlockAddress array from LLVM Pass

Mustakimur Rahman Khandaker (Mustakim) via cfe-dev cfe-dev at lists.llvm.org
Mon Jan 28 12:11:37 PST 2019


Hi

Good day. For the following function local static constant array:

static const __attribute__((used))
__attribute__((section("data"))) void *codetable[] = {
&&RETURN, &&INCREMENT, &&DECREMENT, &&DOUBLE, &&SWAPWORD};
I have the following in the LLVM IR.

@sampleCode.codetable = internal global [5 x i8*] [i8* blockaddress(@sampleCode, %19), i8* blockaddress(@sampleCode, %22), i8* blockaddress(@sampleCode, %25), i8* blockaddress(@sampleCode, %28), i8* blockaddress(@sampleCode, %31)], section "data", align 16
Here the array elements are labels in c code. I have done following to create the same array from LLVM pass.
std::vector<BlockAddress *> tmp;

Function *fn = ...
BasicBlock *bb = ...

BlockAddress *bba = BlockAddress::get(fn, bb);
tmp.push_back(bba);

GlobalVariable *gvar_ptr_abc = new GlobalVariable(
/*Module=*/*fn->getParent(),
/*Type=*/PointerTy,
/*isConstant=*/false,
/*Linkage=*/GlobalValue::InternalLinkage,
/*Initializer=*/0, // has initializer, specified below
/*Name=*/"labelTracker");
gvar_ptr_abc->setAlignment(16);
Constant *blockItems = ConstantDataArray::get(fn->getContext(), tmp);
gvar_ptr_abc->setInitializer(blockItems);
I get error with following: Unsupported type in Type::getScalarTy

Can anyone suggest what I suppose to do? It is definitely related to my type declaration and BlockAddress items, but I don't know what it is exactly.
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