1*d415bd75Srobert //===- DXContainerGlobals.cpp - DXContainer global generator pass ---------===//
2*d415bd75Srobert //
3*d415bd75Srobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*d415bd75Srobert // See https://llvm.org/LICENSE.txt for license information.
5*d415bd75Srobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*d415bd75Srobert //
7*d415bd75Srobert //===----------------------------------------------------------------------===//
8*d415bd75Srobert //
9*d415bd75Srobert // DXContainerGlobalsPass implementation.
10*d415bd75Srobert //
11*d415bd75Srobert //===----------------------------------------------------------------------===//
12*d415bd75Srobert
13*d415bd75Srobert #include "DXILShaderFlags.h"
14*d415bd75Srobert #include "DirectX.h"
15*d415bd75Srobert #include "llvm/ADT/StringRef.h"
16*d415bd75Srobert #include "llvm/BinaryFormat/DXContainer.h"
17*d415bd75Srobert #include "llvm/CodeGen/Passes.h"
18*d415bd75Srobert #include "llvm/IR/Constants.h"
19*d415bd75Srobert #include "llvm/InitializePasses.h"
20*d415bd75Srobert #include "llvm/Pass.h"
21*d415bd75Srobert #include "llvm/Support/MD5.h"
22*d415bd75Srobert #include "llvm/Transforms/Utils/ModuleUtils.h"
23*d415bd75Srobert
24*d415bd75Srobert using namespace llvm;
25*d415bd75Srobert using namespace llvm::dxil;
26*d415bd75Srobert
27*d415bd75Srobert namespace {
28*d415bd75Srobert class DXContainerGlobals : public llvm::ModulePass {
29*d415bd75Srobert
30*d415bd75Srobert GlobalVariable *getShaderFlags(Module &M);
31*d415bd75Srobert GlobalVariable *computeShaderHash(Module &M);
32*d415bd75Srobert
33*d415bd75Srobert public:
34*d415bd75Srobert static char ID; // Pass identification, replacement for typeid
DXContainerGlobals()35*d415bd75Srobert DXContainerGlobals() : ModulePass(ID) {
36*d415bd75Srobert initializeDXContainerGlobalsPass(*PassRegistry::getPassRegistry());
37*d415bd75Srobert }
38*d415bd75Srobert
getPassName() const39*d415bd75Srobert StringRef getPassName() const override {
40*d415bd75Srobert return "DXContainer Global Emitter";
41*d415bd75Srobert }
42*d415bd75Srobert
43*d415bd75Srobert bool runOnModule(Module &M) override;
44*d415bd75Srobert
getAnalysisUsage(AnalysisUsage & AU) const45*d415bd75Srobert void getAnalysisUsage(AnalysisUsage &AU) const override {
46*d415bd75Srobert AU.setPreservesAll();
47*d415bd75Srobert AU.addRequired<ShaderFlagsAnalysisWrapper>();
48*d415bd75Srobert }
49*d415bd75Srobert };
50*d415bd75Srobert
51*d415bd75Srobert } // namespace
52*d415bd75Srobert
runOnModule(Module & M)53*d415bd75Srobert bool DXContainerGlobals::runOnModule(Module &M) {
54*d415bd75Srobert llvm::SmallVector<GlobalValue *> Globals;
55*d415bd75Srobert Globals.push_back(getShaderFlags(M));
56*d415bd75Srobert Globals.push_back(computeShaderHash(M));
57*d415bd75Srobert
58*d415bd75Srobert appendToCompilerUsed(M, Globals);
59*d415bd75Srobert return true;
60*d415bd75Srobert }
61*d415bd75Srobert
getShaderFlags(Module & M)62*d415bd75Srobert GlobalVariable *DXContainerGlobals::getShaderFlags(Module &M) {
63*d415bd75Srobert const uint64_t Flags =
64*d415bd75Srobert (uint64_t)(getAnalysis<ShaderFlagsAnalysisWrapper>().getShaderFlags());
65*d415bd75Srobert
66*d415bd75Srobert Constant *FlagsConstant = ConstantInt::get(M.getContext(), APInt(64, Flags));
67*d415bd75Srobert auto *GV = new llvm::GlobalVariable(M, FlagsConstant->getType(), true,
68*d415bd75Srobert GlobalValue::PrivateLinkage,
69*d415bd75Srobert FlagsConstant, "dx.sfi0");
70*d415bd75Srobert GV->setSection("SFI0");
71*d415bd75Srobert GV->setAlignment(Align(4));
72*d415bd75Srobert return GV;
73*d415bd75Srobert }
74*d415bd75Srobert
computeShaderHash(Module & M)75*d415bd75Srobert GlobalVariable *DXContainerGlobals::computeShaderHash(Module &M) {
76*d415bd75Srobert auto *DXILConstant =
77*d415bd75Srobert cast<ConstantDataArray>(M.getNamedGlobal("dx.dxil")->getInitializer());
78*d415bd75Srobert MD5 Digest;
79*d415bd75Srobert Digest.update(DXILConstant->getRawDataValues());
80*d415bd75Srobert MD5::MD5Result Result = Digest.final();
81*d415bd75Srobert
82*d415bd75Srobert dxbc::ShaderHash HashData = {0, {0}};
83*d415bd75Srobert // The Hash's IncludesSource flag gets set whenever the hashed shader includes
84*d415bd75Srobert // debug information.
85*d415bd75Srobert if (M.debug_compile_units_begin() != M.debug_compile_units_end())
86*d415bd75Srobert HashData.Flags = static_cast<uint32_t>(dxbc::HashFlags::IncludesSource);
87*d415bd75Srobert
88*d415bd75Srobert memcpy(reinterpret_cast<void *>(&HashData.Digest), Result.data(), 16);
89*d415bd75Srobert if (sys::IsBigEndianHost)
90*d415bd75Srobert HashData.swapBytes();
91*d415bd75Srobert StringRef Data(reinterpret_cast<char *>(&HashData), sizeof(dxbc::ShaderHash));
92*d415bd75Srobert
93*d415bd75Srobert Constant *ModuleConstant =
94*d415bd75Srobert ConstantDataArray::get(M.getContext(), arrayRefFromStringRef(Data));
95*d415bd75Srobert auto *GV = new llvm::GlobalVariable(M, ModuleConstant->getType(), true,
96*d415bd75Srobert GlobalValue::PrivateLinkage,
97*d415bd75Srobert ModuleConstant, "dx.hash");
98*d415bd75Srobert GV->setSection("HASH");
99*d415bd75Srobert GV->setAlignment(Align(4));
100*d415bd75Srobert return GV;
101*d415bd75Srobert }
102*d415bd75Srobert
103*d415bd75Srobert char DXContainerGlobals::ID = 0;
104*d415bd75Srobert INITIALIZE_PASS_BEGIN(DXContainerGlobals, "dxil-globals",
105*d415bd75Srobert "DXContainer Global Emitter", false, true)
INITIALIZE_PASS_DEPENDENCY(ShaderFlagsAnalysisWrapper)106*d415bd75Srobert INITIALIZE_PASS_DEPENDENCY(ShaderFlagsAnalysisWrapper)
107*d415bd75Srobert INITIALIZE_PASS_END(DXContainerGlobals, "dxil-globals",
108*d415bd75Srobert "DXContainer Global Emitter", false, true)
109*d415bd75Srobert
110*d415bd75Srobert ModulePass *llvm::createDXContainerGlobalsPass() {
111*d415bd75Srobert return new DXContainerGlobals();
112*d415bd75Srobert }
113