llvm/lib/Target/DirectX/DXILPostOptimizationValidation.cpp

//===- DXILPostOptimizationValidation.cpp - Opt DXIL validation ----------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#include "DXILPostOptimizationValidation.h"
#include "DXILShaderFlags.h"
#include "DirectX.h"
#include "llvm/Analysis/DXILMetadataAnalysis.h"
#include "llvm/Analysis/DXILResource.h"
#include "llvm/IR/DiagnosticInfo.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicsDirectX.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"

#define DEBUG_TYPE "dxil-post-optimization-validation"

using namespace llvm;
using namespace llvm::dxil;

namespace {

static void reportInvalidDirection(Module &M, DXILResourceMap &DRM) {
  for (const auto &UAV : DRM.uavs()) {
    if (UAV.CounterDirection != ResourceCounterDirection::Invalid)
      continue;

    CallInst *ResourceHandle = nullptr;
    for (CallInst *MaybeHandle : DRM.calls()) {
      if (*DRM.find(MaybeHandle) == UAV) {
        ResourceHandle = MaybeHandle;
        break;
      }
    }

    StringRef Message = "RWStructuredBuffers may increment or decrement their "
                        "counters, but not both.";
    for (const auto &U : ResourceHandle->users()) {
      const CallInst *CI = dyn_cast<CallInst>(U);
      if (!CI && CI->getIntrinsicID() != Intrinsic::dx_resource_updatecounter)
        continue;

      M.getContext().diagnose(DiagnosticInfoGenericWithLoc(
          Message, *CI->getFunction(), CI->getDebugLoc()));
    }
  }
}

} // namespace

PreservedAnalyses
DXILPostOptimizationValidation::run(Module &M, ModuleAnalysisManager &MAM) {
  DXILResourceMap &DRM = MAM.getResult<DXILResourceAnalysis>(M);

  if (DRM.hasInvalidCounterDirection())
    reportInvalidDirection(M, DRM);

  return PreservedAnalyses::all();
}

namespace {
class DXILPostOptimizationValidationLegacy : public ModulePass {
public:
  bool runOnModule(Module &M) override {
    DXILResourceMap &DRM =
        getAnalysis<DXILResourceWrapperPass>().getResourceMap();

    if (DRM.hasInvalidCounterDirection())
      reportInvalidDirection(M, DRM);

    return false;
  }
  StringRef getPassName() const override {
    return "DXIL Post Optimization Validation";
  }
  DXILPostOptimizationValidationLegacy() : ModulePass(ID) {}

  static char ID; // Pass identification.
  void getAnalysisUsage(llvm::AnalysisUsage &AU) const override {
    AU.addRequired<DXILResourceWrapperPass>();
    AU.addPreserved<DXILResourceWrapperPass>();
    AU.addPreserved<DXILMetadataAnalysisWrapperPass>();
    AU.addPreserved<ShaderFlagsAnalysisWrapper>();
  }
};
char DXILPostOptimizationValidationLegacy::ID = 0;
} // end anonymous namespace

INITIALIZE_PASS_BEGIN(DXILPostOptimizationValidationLegacy, DEBUG_TYPE,
                      "DXIL Post Optimization Validation", false, false)
INITIALIZE_PASS_DEPENDENCY(DXILResourceTypeWrapperPass)
INITIALIZE_PASS_DEPENDENCY(DXILResourceWrapperPass)
INITIALIZE_PASS_END(DXILPostOptimizationValidationLegacy, DEBUG_TYPE,
                    "DXIL Post Optimization Validation", false, false)

ModulePass *llvm::createDXILPostOptimizationValidationLegacyPass() {
  return new DXILPostOptimizationValidationLegacy();
}