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
22using namespace llvm;
23
24#define DEBUG_TYPE "asm-printer"
25
26namespace {
27
28// The DXILAsmPrinter is mostly a stub because DXIL is just LLVM bitcode which
29// gets embedded into a DXContainer file.
30class DXILAsmPrinter : public AsmPrinter {
31public:
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
42void DXILAsmPrinter::emitGlobalVariable(const GlobalVariable *GV) {
43 // If there is no initializer, or no explicit section do nothing
44 if (!GV->hasInitializer() || GV->hasImplicitSection() || !GV->hasSection())
45 return;
46 // Skip the LLVM metadata
47 if (GV->getSection() == "llvm.metadata")
48 return;
49 SectionKind GVKind = TargetLoweringObjectFile::getKindForGlobal(GO: GV, TM);
50 MCSection *TheSection = getObjFileLowering().SectionForGlobal(GO: GV, Kind: GVKind, TM);
51 OutStreamer->switchSection(Section: TheSection);
52 emitGlobalConstant(DL: GV->getDataLayout(), CV: GV->getInitializer());
53}
54
55extern "C" LLVM_ABI LLVM_EXTERNAL_VISIBILITY void
56LLVMInitializeDirectXAsmPrinter() {
57 RegisterAsmPrinter<DXILAsmPrinter> X(getTheDirectXTarget());
58}
59