1 //===-- DirectXAsmPrinter.cpp - DirectX assembly writer --------*- C++ -*--===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file contains AsmPrinters for the DirectX backend. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "TargetInfo/DirectXTargetInfo.h" 14 #include "llvm/CodeGen/AsmPrinter.h" 15 #include "llvm/IR/GlobalVariable.h" 16 #include "llvm/IR/Module.h" 17 #include "llvm/MC/MCStreamer.h" 18 #include "llvm/MC/SectionKind.h" 19 #include "llvm/MC/TargetRegistry.h" 20 #include "llvm/Target/TargetLoweringObjectFile.h" 21 22 using namespace llvm; 23 24 #define DEBUG_TYPE "asm-printer" 25 26 namespace { 27 28 // The DXILAsmPrinter is mostly a stub because DXIL is just LLVM bitcode which 29 // gets embedded into a DXContainer file. 30 class DXILAsmPrinter : public AsmPrinter { 31 public: 32 explicit DXILAsmPrinter(TargetMachine &TM, 33 std::unique_ptr<MCStreamer> Streamer) 34 : AsmPrinter(TM, std::move(Streamer)) {} 35 36 StringRef getPassName() const override { return "DXIL Assembly Printer"; } 37 void emitGlobalVariable(const GlobalVariable *GV) override; 38 bool runOnMachineFunction(MachineFunction &MF) override { return false; } 39 }; 40 } // namespace 41 42 void DXILAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) { 43 // If there is no initializer or the section is implicit, do nothing 44 if (!GV->hasInitializer() || GV->hasImplicitSection()) 45 return; 46 // Skip the LLVM metadata 47 if (GV->getSection() == "llvm.metadata") 48 return; 49 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GV, TM); 50 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GV, GVKind, TM); 51 OutStreamer->switchSection(TheSection); 52 emitGlobalConstant(GV->getParent()->getDataLayout(), GV->getInitializer()); 53 } 54 55 extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeDirectXAsmPrinter() { 56 RegisterAsmPrinter<DXILAsmPrinter> X(getTheDirectXTarget()); 57 } 58