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//===- DXContainerGlobals.cpp - DXContainer global generator pass ---------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// DXContainerGlobalsPass implementation.
//
//===----------------------------------------------------------------------===//
#include "DXILShaderFlags.h"
#include "DirectX.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/BinaryFormat/DXContainer.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/Module.h"
#include "llvm/InitializePasses.h"
#include "llvm/MC/DXContainerPSVInfo.h"
#include "llvm/Pass.h"
#include "llvm/Support/MD5.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
using namespace llvm;
using namespace llvm::dxil;
using namespace llvm::mcdxbc;
namespace {
class DXContainerGlobals : public llvm::ModulePass {
GlobalVariable *buildContainerGlobal(Module &M, Constant *Content,
StringRef Name, StringRef SectionName);
GlobalVariable *getFeatureFlags(Module &M);
GlobalVariable *computeShaderHash(Module &M);
GlobalVariable *buildSignature(Module &M, Signature &Sig, StringRef Name,
StringRef SectionName);
void addSignature(Module &M, SmallVector<GlobalValue *> &Globals);
void addPipelineStateValidationInfo(Module &M,
SmallVector<GlobalValue *> &Globals);
public:
static char ID; // Pass identification, replacement for typeid
DXContainerGlobals() : ModulePass(ID) {
initializeDXContainerGlobalsPass(*PassRegistry::getPassRegistry());
}
StringRef getPassName() const override {
return "DXContainer Global Emitter";
}
bool runOnModule(Module &M) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
AU.addRequired<ShaderFlagsAnalysisWrapper>();
}
};
} // namespace
bool DXContainerGlobals::runOnModule(Module &M) {
llvm::SmallVector<GlobalValue *> Globals;
Globals.push_back(getFeatureFlags(M));
Globals.push_back(computeShaderHash(M));
addSignature(M, Globals);
addPipelineStateValidationInfo(M, Globals);
appendToCompilerUsed(M, Globals);
return true;
}
GlobalVariable *DXContainerGlobals::getFeatureFlags(Module &M) {
const uint64_t FeatureFlags =
static_cast<uint64_t>(getAnalysis<ShaderFlagsAnalysisWrapper>()
.getShaderFlags()
.getFeatureFlags());
Constant *FeatureFlagsConstant =
ConstantInt::get(M.getContext(), APInt(64, FeatureFlags));
return buildContainerGlobal(M, FeatureFlagsConstant, "dx.sfi0", "SFI0");
}
GlobalVariable *DXContainerGlobals::computeShaderHash(Module &M) {
auto *DXILConstant =
cast<ConstantDataArray>(M.getNamedGlobal("dx.dxil")->getInitializer());
MD5 Digest;
Digest.update(DXILConstant->getRawDataValues());
MD5::MD5Result Result = Digest.final();
dxbc::ShaderHash HashData = {0, {0}};
// The Hash's IncludesSource flag gets set whenever the hashed shader includes
// debug information.
if (M.debug_compile_units_begin() != M.debug_compile_units_end())
HashData.Flags = static_cast<uint32_t>(dxbc::HashFlags::IncludesSource);
memcpy(reinterpret_cast<void *>(&HashData.Digest), Result.data(), 16);
if (sys::IsBigEndianHost)
HashData.swapBytes();
StringRef Data(reinterpret_cast<char *>(&HashData), sizeof(dxbc::ShaderHash));
Constant *ModuleConstant =
ConstantDataArray::get(M.getContext(), arrayRefFromStringRef(Data));
return buildContainerGlobal(M, ModuleConstant, "dx.hash", "HASH");
}
GlobalVariable *DXContainerGlobals::buildContainerGlobal(
Module &M, Constant *Content, StringRef Name, StringRef SectionName) {
auto *GV = new llvm::GlobalVariable(
M, Content->getType(), true, GlobalValue::PrivateLinkage, Content, Name);
GV->setSection(SectionName);
GV->setAlignment(Align(4));
return GV;
}
GlobalVariable *DXContainerGlobals::buildSignature(Module &M, Signature &Sig,
StringRef Name,
StringRef SectionName) {
SmallString<256> Data;
raw_svector_ostream OS(Data);
Sig.write(OS);
Constant *Constant =
ConstantDataArray::getString(M.getContext(), Data, /*AddNull*/ false);
return buildContainerGlobal(M, Constant, Name, SectionName);
}
void DXContainerGlobals::addSignature(Module &M,
SmallVector<GlobalValue *> &Globals) {
// FIXME: support graphics shader.
// see issue https://github.com/llvm/llvm-project/issues/90504.
Signature InputSig;
Globals.emplace_back(buildSignature(M, InputSig, "dx.isg1", "ISG1"));
Signature OutputSig;
Globals.emplace_back(buildSignature(M, OutputSig, "dx.osg1", "OSG1"));
}
void DXContainerGlobals::addPipelineStateValidationInfo(
Module &M, SmallVector<GlobalValue *> &Globals) {
SmallString<256> Data;
raw_svector_ostream OS(Data);
PSVRuntimeInfo PSV;
Triple TT(M.getTargetTriple());
PSV.BaseData.MinimumWaveLaneCount = 0;
PSV.BaseData.MaximumWaveLaneCount = std::numeric_limits<uint32_t>::max();
PSV.BaseData.ShaderStage =
static_cast<uint8_t>(TT.getEnvironment() - Triple::Pixel);
// Hardcoded values here to unblock loading the shader into D3D.
//
// TODO: Lots more stuff to do here!
//
// See issue https://github.com/llvm/llvm-project/issues/96674.
PSV.BaseData.NumThreadsX = 1;
PSV.BaseData.NumThreadsY = 1;
PSV.BaseData.NumThreadsZ = 1;
PSV.EntryName = "main";
PSV.finalize(TT.getEnvironment());
PSV.write(OS);
Constant *Constant =
ConstantDataArray::getString(M.getContext(), Data, /*AddNull*/ false);
Globals.emplace_back(buildContainerGlobal(M, Constant, "dx.psv0", "PSV0"));
}
char DXContainerGlobals::ID = 0;
INITIALIZE_PASS_BEGIN(DXContainerGlobals, "dxil-globals",
"DXContainer Global Emitter", false, true)
INITIALIZE_PASS_DEPENDENCY(ShaderFlagsAnalysisWrapper)
INITIALIZE_PASS_END(DXContainerGlobals, "dxil-globals",
"DXContainer Global Emitter", false, true)
ModulePass *llvm::createDXContainerGlobalsPass() {
return new DXContainerGlobals();
}
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