[llvm-dev] [cfe-dev] Create a BlockAddress array from LLVM Pass (original) (raw)

Eli Friedman via llvm-dev llvm-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. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20190128/d30a33f5/attachment.html>

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