forked from OSchip/llvm-project
41 lines
1.3 KiB
Go
41 lines
1.3 KiB
Go
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//===- utils.go - misc utils ----------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements misellaneous utilities for IR generation.
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//
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//===----------------------------------------------------------------------===//
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package irgen
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import (
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"llvm.org/llgo/third_party/go.tools/go/types"
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"llvm.org/llvm/bindings/go/llvm"
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)
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func (fr *frame) loadOrNull(cond, ptr llvm.Value, ty types.Type) *govalue {
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startbb := fr.builder.GetInsertBlock()
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loadbb := llvm.AddBasicBlock(fr.function, "")
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contbb := llvm.AddBasicBlock(fr.function, "")
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fr.builder.CreateCondBr(cond, loadbb, contbb)
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fr.builder.SetInsertPointAtEnd(loadbb)
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llty := fr.types.ToLLVM(ty)
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typedptr := fr.builder.CreateBitCast(ptr, llvm.PointerType(llty, 0), "")
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loadedval := fr.builder.CreateLoad(typedptr, "")
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fr.builder.CreateBr(contbb)
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fr.builder.SetInsertPointAtEnd(contbb)
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llv := fr.builder.CreatePHI(llty, "")
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llv.AddIncoming(
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[]llvm.Value{llvm.ConstNull(llty), loadedval},
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[]llvm.BasicBlock{startbb, loadbb},
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)
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return newValue(llv, ty)
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}
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