8000 How to make "..." arg type? · Issue #178 · llir/llvm · GitHub
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Nv7-GitHub opened this issue May 16, 2021 · 2 comments
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How to make "..." arg type? #178

Nv7-GitHub opened this issue May 16, 2021 · 2 comments
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@Nv7-GitHub
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I want to call printf. When using clang, it emits:

declare i32 @printf(i8*, ...)

How do I make a new function with llir, with ... as the argument?
@mewmew
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mewmew commented May 16, 2021 •
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Hi @Nv7-GitHub,

Glad to see you experimenting with LLVM IR in Go :)

How do I make a new function with llir, with ... as the argument?

Set the Variadic field of ir.Func.Sig to true.

package main

import (
	"fmt"

	"github.com/llir/llvm/ir"
	irtypes "github.com/llir/llvm/ir/types"
)

func main() {
	i32Type := irtypes.I32
	i8PtrType := irtypes.NewPointer(irtypes.I8)
	param := ir.NewParam("format", i8PtrType)
	printfFunc := ir.NewFunc("printf", i32Type, param)
	printfFunc.Sig.Variadic = true

	module := ir.NewModule()
	module.Funcs = append(module.Funcs, printfFunc)
	fmt.Println(module)
}

Output:

declare i32 @printf(i8* %format, ...)

Cheers,
Robin

@mewmew mewmew added the howto label May 16, 2021
@mewmew
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mewmew commented May 16, 2021

Closing this issue for now as resolved. Hope it helped. And if not, just write a comment and we can re-open it.

Cheers,
Robin
< 6FDA /task-lists>

@mewmew mewmew closed this as completed May 16, 2021
@mewmew mewmew mentioned this issue Jun 13, 2021
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