[cfe-dev] Create a BlockAddress array from LLVM Pass
Eli Friedman via cfe-dev
cfe-dev at lists.llvm.org
Mon Jan 28 12:34:27 PST 2019
Please don’t send questions to both cfe-dev and llvm-dev; usually one or the other is more appropriate (in this case, it’s llvm-dev, since there’s no clang code involved).
I think you meant to call ConstantArray::get, not ConstantDataArray::get. (We should probably fix ConstantDataArray::get() to use enable_if or something like that, so your example fails to compile instead of generating a weird runtime error.)
-Eli
From: cfe-dev <cfe-dev-bounces at lists.llvm.org> On Behalf Of Mustakimur Rahman Khandaker (Mustakim) via cfe-dev
Sent: Monday, January 28, 2019 12:12 PM
To: llvm-dev at lists.llvm.org; cfe-dev at lists.llvm.org
Subject: [EXT] [cfe-dev] Create a BlockAddress array from LLVM Pass
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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