1//===- DXILUpgrade.cpp - Upgrade DXIL metadata to LLVM constructs ---------===//
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#include "llvm/Transforms/Utils/DXILUpgrade.h"
10#include "llvm/IR/Constants.h"
11#include "llvm/IR/Metadata.h"
12#include "llvm/IR/Module.h"
13#include "llvm/Support/Debug.h"
14
15using namespace llvm;
16
17#define DEBUG_TYPE "dxil-upgrade"
18
19static bool handleValVerMetadata(Module &M) {
20 NamedMDNode *ValVer = M.getNamedMetadata(Name: "dx.valver");
21 if (!ValVer)
22 return false;
23
24 LLVM_DEBUG({
25 MDNode *N = ValVer->getOperand(0);
26 auto X = mdconst::extract<ConstantInt>(N->getOperand(0))->getZExtValue();
27 auto Y = mdconst::extract<ConstantInt>(N->getOperand(1))->getZExtValue();
28 dbgs() << "DXIL: validation version: " << X << "." << Y << "\n";
29 });
30 // We don't need the validation version internally, so we drop it.
31 ValVer->dropAllReferences();
32 ValVer->eraseFromParent();
33 return true;
34}
35
36PreservedAnalyses DXILUpgradePass::run(Module &M, ModuleAnalysisManager &AM) {
37 PreservedAnalyses PA;
38 // We never add, remove, or change functions here.
39 PA.preserve<FunctionAnalysisManagerModuleProxy>();
40 PA.preserveSet<AllAnalysesOn<Function>>();
41
42 bool Changed = false;
43 Changed |= handleValVerMetadata(M);
44
45 if (!Changed)
46 return PreservedAnalyses::all();
47 return PA;
48}
49