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