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SpirvEmitter.cpp
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SpirvEmitter.cpp
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//===------- SpirvEmitter.cpp - SPIR-V Binary Code Emitter ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//===----------------------------------------------------------------------===//
//
// This file implements a SPIR-V emitter class that takes in HLSL AST and emits
// SPIR-V binary words.
//
//===----------------------------------------------------------------------===//
#include "SpirvEmitter.h"
#include "AlignmentSizeCalculator.h"
#include "InitListHandler.h"
#include "LowerTypeVisitor.h"
#include "RawBufferMethods.h"
#include "dxc/DXIL/DxilConstants.h"
#include "dxc/HlslIntrinsicOp.h"
#include "spirv-tools/optimizer.hpp"
#include "clang/AST/HlslTypes.h"
#include "clang/AST/ParentMap.h"
#include "clang/AST/RecordLayout.h"
#include "clang/AST/Type.h"
#include "clang/SPIRV/AstTypeProbe.h"
#include "clang/SPIRV/String.h"
#include "clang/Sema/Sema.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/SetVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/Support/Casting.h"
#ifdef SUPPORT_QUERY_GIT_COMMIT_INFO
#include "clang/Basic/Version.h"
#else
namespace clang {
uint32_t getGitCommitCount() { return 0; }
const char *getGitCommitHash() { return "<unknown-hash>"; }
} // namespace clang
#endif // SUPPORT_QUERY_GIT_COMMIT_INFO
namespace clang {
namespace spirv {
using spvtools::opt::DescriptorSetAndBinding;
namespace {
// Returns true if the given decl is an implicit variable declaration inside the
// "vk" namespace.
bool isImplicitVarDeclInVkNamespace(const Decl *decl) {
if (!decl)
return false;
if (auto *varDecl = dyn_cast<VarDecl>(decl)) {
// Check whether it is implicitly defined.
if (!decl->isImplicit())
return false;
if (auto *nsDecl = dyn_cast<NamespaceDecl>(varDecl->getDeclContext()))
if (nsDecl->getName().equals("vk"))
return true;
}
return false;
}
// Returns true if the given decl has the given semantic.
bool hasSemantic(const DeclaratorDecl *decl,
hlsl::DXIL::SemanticKind semanticKind) {
using namespace hlsl;
for (auto *annotation : decl->getUnusualAnnotations()) {
if (auto *semanticDecl = dyn_cast<SemanticDecl>(annotation)) {
llvm::StringRef semanticName;
uint32_t semanticIndex = 0;
Semantic::DecomposeNameAndIndex(semanticDecl->SemanticName, &semanticName,
&semanticIndex);
const auto *semantic = Semantic::GetByName(semanticName);
if (semantic->GetKind() == semanticKind)
return true;
}
}
return false;
}
const ParmVarDecl *patchConstFuncTakesHullOutputPatch(FunctionDecl *pcf) {
for (const auto *param : pcf->parameters())
if (hlsl::IsHLSLOutputPatchType(param->getType()))
return param;
return nullptr;
}
inline bool isSpirvMatrixOp(spv::Op opcode) {
return opcode == spv::Op::OpMatrixTimesMatrix ||
opcode == spv::Op::OpMatrixTimesVector ||
opcode == spv::Op::OpMatrixTimesScalar;
}
/// If expr is a (RW)StructuredBuffer.Load(), returns the object and writes
/// index. Otherwiser, returns false.
// TODO: The following doesn't handle Load(int, int) yet. And it is basically a
// duplicate of doCXXMemberCallExpr.
const Expr *isStructuredBufferLoad(const Expr *expr, const Expr **index) {
using namespace hlsl;
if (const auto *indexing = dyn_cast<CXXMemberCallExpr>(expr)) {
const auto *callee = indexing->getDirectCallee();
uint32_t opcode = static_cast<uint32_t>(IntrinsicOp::Num_Intrinsics);
llvm::StringRef group;
if (GetIntrinsicOp(callee, opcode, group)) {
if (static_cast<IntrinsicOp>(opcode) == IntrinsicOp::MOP_Load) {
const auto *object = indexing->getImplicitObjectArgument();
if (isStructuredBuffer(object->getType())) {
*index = indexing->getArg(0);
return indexing->getImplicitObjectArgument();
}
}
}
}
return nullptr;
}
/// Returns true if
/// * the given expr is an DeclRefExpr referencing a kind of structured or byte
/// buffer and it is non-alias one, or
/// * the given expr is an CallExpr returning a kind of structured or byte
/// buffer.
/// * the given expr is an ArraySubscriptExpr referencing a kind of structured
/// or byte buffer.
///
/// Note: legalization specific code
bool isReferencingNonAliasStructuredOrByteBuffer(const Expr *expr) {
expr = expr->IgnoreParenCasts();
if (const auto *declRefExpr = dyn_cast<DeclRefExpr>(expr)) {
if (const auto *varDecl = dyn_cast<VarDecl>(declRefExpr->getFoundDecl()))
if (isAKindOfStructuredOrByteBuffer(varDecl->getType()))
return SpirvEmitter::isExternalVar(varDecl);
} else if (const auto *callExpr = dyn_cast<CallExpr>(expr)) {
if (isAKindOfStructuredOrByteBuffer(callExpr->getType()))
return true;
} else if (isa<ArraySubscriptExpr>(expr)) {
return isAKindOfStructuredOrByteBuffer(expr->getType());
}
return false;
}
/// Translates atomic HLSL opcodes into the equivalent SPIR-V opcode.
spv::Op translateAtomicHlslOpcodeToSpirvOpcode(hlsl::IntrinsicOp opcode) {
using namespace hlsl;
using namespace spv;
switch (opcode) {
case IntrinsicOp::IOP_InterlockedAdd:
case IntrinsicOp::MOP_InterlockedAdd:
return Op::OpAtomicIAdd;
case IntrinsicOp::IOP_InterlockedAnd:
case IntrinsicOp::MOP_InterlockedAnd:
return Op::OpAtomicAnd;
case IntrinsicOp::IOP_InterlockedOr:
case IntrinsicOp::MOP_InterlockedOr:
return Op::OpAtomicOr;
case IntrinsicOp::IOP_InterlockedXor:
case IntrinsicOp::MOP_InterlockedXor:
return Op::OpAtomicXor;
case IntrinsicOp::IOP_InterlockedUMax:
case IntrinsicOp::MOP_InterlockedUMax:
return Op::OpAtomicUMax;
case IntrinsicOp::IOP_InterlockedUMin:
case IntrinsicOp::MOP_InterlockedUMin:
return Op::OpAtomicUMin;
case IntrinsicOp::IOP_InterlockedMax:
case IntrinsicOp::MOP_InterlockedMax:
return Op::OpAtomicSMax;
case IntrinsicOp::IOP_InterlockedMin:
case IntrinsicOp::MOP_InterlockedMin:
return Op::OpAtomicSMin;
case IntrinsicOp::IOP_InterlockedExchange:
case IntrinsicOp::MOP_InterlockedExchange:
return Op::OpAtomicExchange;
default:
// Only atomic opcodes are relevant.
break;
}
assert(false && "unimplemented hlsl intrinsic opcode");
return Op::Max;
}
// Returns true if the given opcode is an accepted binary opcode in
// OpSpecConstantOp.
bool isAcceptedSpecConstantBinaryOp(spv::Op op) {
switch (op) {
case spv::Op::OpIAdd:
case spv::Op::OpISub:
case spv::Op::OpIMul:
case spv::Op::OpUDiv:
case spv::Op::OpSDiv:
case spv::Op::OpUMod:
case spv::Op::OpSRem:
case spv::Op::OpSMod:
case spv::Op::OpShiftRightLogical:
case spv::Op::OpShiftRightArithmetic:
case spv::Op::OpShiftLeftLogical:
case spv::Op::OpBitwiseOr:
case spv::Op::OpBitwiseXor:
case spv::Op::OpBitwiseAnd:
case spv::Op::OpVectorShuffle:
case spv::Op::OpCompositeExtract:
case spv::Op::OpCompositeInsert:
case spv::Op::OpLogicalOr:
case spv::Op::OpLogicalAnd:
case spv::Op::OpLogicalNot:
case spv::Op::OpLogicalEqual:
case spv::Op::OpLogicalNotEqual:
case spv::Op::OpIEqual:
case spv::Op::OpINotEqual:
case spv::Op::OpULessThan:
case spv::Op::OpSLessThan:
case spv::Op::OpUGreaterThan:
case spv::Op::OpSGreaterThan:
case spv::Op::OpULessThanEqual:
case spv::Op::OpSLessThanEqual:
case spv::Op::OpUGreaterThanEqual:
case spv::Op::OpSGreaterThanEqual:
return true;
default:
// Accepted binary opcodes return true. Anything else is false.
return false;
}
return false;
}
/// Returns true if the given expression is an accepted initializer for a spec
/// constant.
bool isAcceptedSpecConstantInit(const Expr *init, ASTContext &astContext) {
// Allow numeric casts
init = init->IgnoreParenCasts();
if (isa<CXXBoolLiteralExpr>(init) || isa<IntegerLiteral>(init) ||
isa<FloatingLiteral>(init))
return true;
// Allow the minus operator which is used to specify negative values
if (const auto *unaryOp = dyn_cast<UnaryOperator>(init))
return unaryOp->getOpcode() == UO_Minus &&
isAcceptedSpecConstantInit(unaryOp->getSubExpr(), astContext);
// Allow values that can be evaluated to const.
if (init->isEvaluatable(astContext)) {
return true;
}
return false;
}
/// Returns true if the given function parameter can act as shader stage
/// input parameter.
inline bool canActAsInParmVar(const ParmVarDecl *param) {
// If the parameter has no in/out/inout attribute, it is defaulted to
// an in parameter.
return !param->hasAttr<HLSLOutAttr>() &&
// GS output streams are marked as inout, but it should not be
// used as in parameter.
!hlsl::IsHLSLStreamOutputType(param->getType());
}
/// Returns true if the given function parameter can act as shader stage
/// output parameter.
inline bool canActAsOutParmVar(const ParmVarDecl *param) {
return param->hasAttr<HLSLOutAttr>() || param->hasAttr<HLSLInOutAttr>() ||
hlsl::IsHLSLRayQueryType(param->getType());
}
/// Returns true if the given expression is of builtin type and can be evaluated
/// to a constant zero. Returns false otherwise.
inline bool evaluatesToConstZero(const Expr *expr, ASTContext &astContext) {
const auto type = expr->getType();
if (!type->isBuiltinType())
return false;
Expr::EvalResult evalResult;
if (expr->EvaluateAsRValue(evalResult, astContext) &&
!evalResult.HasSideEffects) {
const auto &val = evalResult.Val;
return ((type->isBooleanType() && !val.getInt().getBoolValue()) ||
(type->isIntegerType() && !val.getInt().getBoolValue()) ||
(type->isFloatingType() && val.getFloat().isZero()));
}
return false;
}
/// Returns the real definition of the callee of the given CallExpr.
///
/// If we are calling a forward-declared function, callee will be the
/// FunctionDecl for the foward-declared function, not the actual
/// definition. The foward-delcaration and defintion are two completely
/// different AST nodes.
inline const FunctionDecl *getCalleeDefinition(const CallExpr *expr) {
const auto *callee = expr->getDirectCallee();
if (callee->isThisDeclarationADefinition())
return callee;
// We need to update callee to the actual definition here
if (!callee->isDefined(callee))
return nullptr;
return callee;
}
/// Returns the referenced definition. The given expr is expected to be a
/// DeclRefExpr or CallExpr after ignoring casts. Returns nullptr otherwise.
const DeclaratorDecl *getReferencedDef(const Expr *expr) {
if (!expr)
return nullptr;
expr = expr->IgnoreParenCasts();
while (const auto *arraySubscriptExpr = dyn_cast<ArraySubscriptExpr>(expr)) {
expr = arraySubscriptExpr->getBase();
expr = expr->IgnoreParenCasts();
}
if (const auto *declRefExpr = dyn_cast<DeclRefExpr>(expr)) {
return dyn_cast_or_null<DeclaratorDecl>(declRefExpr->getDecl());
}
if (const auto *callExpr = dyn_cast<CallExpr>(expr)) {
return getCalleeDefinition(callExpr);
}
return nullptr;
}
/// Returns the number of base classes if this type is a derived class/struct.
/// Returns zero otherwise.
inline uint32_t getNumBaseClasses(QualType type) {
if (const auto *cxxDecl = type->getAsCXXRecordDecl())
return cxxDecl->getNumBases();
return 0;
}
/// Gets the index sequence of casting a derived object to a base object by
/// following the cast chain.
void getBaseClassIndices(const CastExpr *expr,
llvm::SmallVectorImpl<uint32_t> *indices) {
assert(expr->getCastKind() == CK_UncheckedDerivedToBase ||
expr->getCastKind() == CK_HLSLDerivedToBase);
indices->clear();
QualType derivedType = expr->getSubExpr()->getType();
// There are two types of UncheckedDerivedToBase/HLSLDerivedToBase casts:
//
// The first is when a derived object tries to access a member in the base.
// For example: derived.base_member.
// ImplicitCastExpr 'Base' lvalue <UncheckedDerivedToBase (Base)>
// `-DeclRefExpr 'Derived' lvalue Var 0x1f0d9bb2890 'derived' 'Derived'
//
// The second is when a pointer of the dervied is used to access members or
// methods of the base. There are currently no pointers in HLSL, but the
// method defintions can use the "this" pointer.
// For example:
// class Base { float value; };
// class Derviced : Base {
// float4 getBaseValue() { return value; }
// };
//
// In this example, the 'this' pointer (pointing to Derived) is used inside
// 'getBaseValue', which is then cast to a Base pointer:
//
// ImplicitCastExpr 'Base *' <UncheckedDerivedToBase (Base)>
// `-CXXThisExpr 'Derviced *' this
//
// Therefore in order to obtain the derivedDecl below, we must make sure that
// we handle the second case too by using the pointee type.
if (derivedType->isPointerType())
derivedType = derivedType->getPointeeType();
const auto *derivedDecl = derivedType->getAsCXXRecordDecl();
// Go through the base cast chain: for each of the derived to base cast, find
// the index of the base in question in the derived's bases.
for (auto pathIt = expr->path_begin(), pathIe = expr->path_end();
pathIt != pathIe; ++pathIt) {
// The type of the base in question
const auto baseType = (*pathIt)->getType();
uint32_t index = 0;
for (auto baseIt = derivedDecl->bases_begin(),
baseIe = derivedDecl->bases_end();
baseIt != baseIe; ++baseIt, ++index)
if (baseIt->getType() == baseType) {
indices->push_back(index);
break;
}
assert(index < derivedDecl->getNumBases());
// Continue to proceed the next base in the chain
derivedType = baseType;
if (derivedType->isPointerType())
derivedType = derivedType->getPointeeType();
derivedDecl = derivedType->getAsCXXRecordDecl();
}
}
std::string getNamespacePrefix(const Decl *decl) {
std::string nsPrefix = "";
const DeclContext *dc = decl->getDeclContext();
while (dc && !dc->isTranslationUnit()) {
if (const NamespaceDecl *ns = dyn_cast<NamespaceDecl>(dc)) {
if (!ns->isAnonymousNamespace()) {
nsPrefix = ns->getName().str() + "::" + nsPrefix;
}
}
dc = dc->getParent();
}
return nsPrefix;
}
std::string getFnName(const FunctionDecl *fn) {
// Prefix the function name with the struct name if necessary
std::string classOrStructName = "";
if (const auto *memberFn = dyn_cast<CXXMethodDecl>(fn))
if (const auto *st = dyn_cast<CXXRecordDecl>(memberFn->getDeclContext()))
classOrStructName = st->getName().str() + ".";
return getNamespacePrefix(fn) + classOrStructName +
getFunctionOrOperatorName(fn, false);
}
bool isMemoryObjectDeclaration(SpirvInstruction *inst) {
return isa<SpirvVariable>(inst) || isa<SpirvFunctionParameter>(inst);
}
// Returns a pair of the descriptor set and the binding that does not have
// bound Texture or Sampler.
DescriptorSetAndBinding getDSetBindingWithoutTextureOrSampler(
const llvm::SmallVectorImpl<ResourceInfoToCombineSampledImage>
&resourceInfoForSampledImages) {
const DescriptorSetAndBinding kNotFound = {
std::numeric_limits<uint32_t>::max(),
std::numeric_limits<uint32_t>::max()};
if (resourceInfoForSampledImages.empty()) {
return kNotFound;
}
typedef uint8_t TextureAndSamplerExistExistance;
const TextureAndSamplerExistExistance kTextureConfirmed = 1 << 0;
const TextureAndSamplerExistExistance kSamplerConfirmed = 1 << 1;
llvm::DenseMap<std::pair<uint32_t, uint32_t>, TextureAndSamplerExistExistance>
dsetBindingsToTextureSamplerExistance;
for (const auto &itr : resourceInfoForSampledImages) {
auto dsetBinding = std::make_pair(itr.descriptorSet, itr.binding);
TextureAndSamplerExistExistance status = 0;
if (isTexture(itr.type))
status = kTextureConfirmed;
if (isSampler(itr.type))
status = kSamplerConfirmed;
auto existanceItr = dsetBindingsToTextureSamplerExistance.find(dsetBinding);
if (existanceItr == dsetBindingsToTextureSamplerExistance.end()) {
dsetBindingsToTextureSamplerExistance[dsetBinding] = status;
} else {
existanceItr->second = existanceItr->second | status;
}
}
for (const auto &itr : dsetBindingsToTextureSamplerExistance) {
if (itr.second != (kTextureConfirmed | kSamplerConfirmed))
return {itr.first.first, itr.first.second};
}
return kNotFound;
}
// Collects pairs of the descriptor set and the binding to combine
// corresponding Texture and Sampler into the sampled image.
std::vector<DescriptorSetAndBinding> collectDSetBindingsToCombineSampledImage(
const llvm::SmallVectorImpl<ResourceInfoToCombineSampledImage>
&resourceInfoForSampledImages) {
std::vector<DescriptorSetAndBinding> dsetBindings;
for (const auto &itr : resourceInfoForSampledImages) {
dsetBindings.push_back({itr.descriptorSet, itr.binding});
}
return dsetBindings;
}
// Returns a scalar unsigned integer type or a vector of them or a matrix of
// them depending on the scalar/vector/matrix type of boolType. The element
// type of boolType must be BuiltinType::Bool type.
QualType getUintTypeForBool(ASTContext &astContext,
CompilerInstance &theCompilerInstance,
QualType boolType) {
assert(isBoolOrVecMatOfBoolType(boolType));
uint32_t vecSize = 1, numRows = 0, numCols = 0;
QualType uintType = astContext.UnsignedIntTy;
if (isScalarType(boolType) || isVectorType(boolType, nullptr, &vecSize)) {
if (vecSize == 1)
return uintType;
else
return astContext.getExtVectorType(uintType, vecSize);
} else {
const bool isMat = isMxNMatrix(boolType, nullptr, &numRows, &numCols);
assert(isMat);
(void)isMat;
const clang::Type *type = boolType.getCanonicalType().getTypePtr();
const RecordType *RT = cast<RecordType>(type);
const ClassTemplateSpecializationDecl *templateSpecDecl =
cast<ClassTemplateSpecializationDecl>(RT->getDecl());
ClassTemplateDecl *templateDecl =
templateSpecDecl->getSpecializedTemplate();
return getHLSLMatrixType(astContext, theCompilerInstance.getSema(),
templateDecl, uintType, numRows, numCols);
}
return QualType();
}
bool isVkRawBufferLoadIntrinsic(const clang::FunctionDecl *FD) {
if (!FD->getName().equals("RawBufferLoad"))
return false;
if (auto *nsDecl = dyn_cast<NamespaceDecl>(FD->getDeclContext()))
if (!nsDecl->getName().equals("vk"))
return false;
return true;
}
bool isCooperativeMatrixGetLengthIntrinsic(
const FunctionDecl *functionDeclaration) {
return functionDeclaration->getName().equals(
"__builtin_spv_CooperativeMatrixLengthKHR");
}
// Takes an AST member type, and determines its index in the equivalent SPIR-V
// struct type. This is required as the struct layout might change between the
// AST representation and SPIR-V representation.
uint32_t getFieldIndexInStruct(const StructType *spirvStructType,
const QualType &astStructType,
const FieldDecl *fieldDecl) {
assert(fieldDecl);
const uint32_t indexAST =
getNumBaseClasses(astStructType) + fieldDecl->getFieldIndex();
const auto &fields = spirvStructType->getFields();
assert(indexAST < fields.size());
return fields[indexAST].fieldIndex;
}
// Takes an AST struct type, and lowers is to the equivalent SPIR-V type.
const StructType *lowerStructType(const SpirvCodeGenOptions &spirvOptions,
LowerTypeVisitor &lowerTypeVisitor,
const QualType &structType) {
// If we are accessing a derived struct, we need to account for the number
// of base structs, since they are placed as fields at the beginning of the
// derived struct.
auto baseType = structType;
if (baseType->isPointerType()) {
baseType = baseType->getPointeeType();
}
// The AST type index is not representative of the SPIR-V type index
// because we might squash some fields (bitfields by ex.).
// What we need is to match each AST node with the squashed field and then,
// determine the real index.
const SpirvType *spvType = lowerTypeVisitor.lowerType(
baseType, spirvOptions.sBufferLayoutRule, llvm::None, SourceLocation());
const StructType *output = dyn_cast<StructType>(spvType);
assert(output != nullptr);
return output;
}
} // namespace
SpirvEmitter::SpirvEmitter(CompilerInstance &ci)
: theCompilerInstance(ci), astContext(ci.getASTContext()),
diags(ci.getDiagnostics()),
spirvOptions(ci.getCodeGenOpts().SpirvOptions),
hlslEntryFunctionName(ci.getCodeGenOpts().HLSLEntryFunction),
spvContext(), featureManager(diags, spirvOptions),
spvBuilder(astContext, spvContext, spirvOptions, featureManager),
declIdMapper(astContext, spvContext, spvBuilder, *this, featureManager,
spirvOptions),
constEvaluator(astContext, spvBuilder), entryFunction(nullptr),
curFunction(nullptr), curThis(nullptr), seenPushConstantAt(),
isSpecConstantMode(false), needsLegalization(false),
beforeHlslLegalization(false), mainSourceFile(nullptr) {
// Get ShaderModel from command line hlsl profile option.
const hlsl::ShaderModel *shaderModel =
hlsl::ShaderModel::GetByName(ci.getCodeGenOpts().HLSLProfile.c_str());
if (shaderModel->GetKind() == hlsl::ShaderModel::Kind::Invalid)
emitError("unknown shader module: %0", {}) << shaderModel->GetName();
if (spirvOptions.invertY && !shaderModel->IsVS() && !shaderModel->IsDS() &&
!shaderModel->IsGS() && !shaderModel->IsMS())
emitError("-fvk-invert-y can only be used in VS/DS/GS/MS", {});
if (spirvOptions.useGlLayout && spirvOptions.useDxLayout)
emitError("cannot specify both -fvk-use-dx-layout and -fvk-use-gl-layout",
{});
// Set shader model kind and hlsl major/minor version.
spvContext.setCurrentShaderModelKind(shaderModel->GetKind());
spvContext.setMajorVersion(shaderModel->GetMajor());
spvContext.setMinorVersion(shaderModel->GetMinor());
spirvOptions.signaturePacking =
ci.getCodeGenOpts().HLSLSignaturePackingStrategy ==
(unsigned)hlsl::DXIL::PackingStrategy::Optimized;
if (spirvOptions.useDxLayout) {
spirvOptions.cBufferLayoutRule = SpirvLayoutRule::FxcCTBuffer;
spirvOptions.tBufferLayoutRule = SpirvLayoutRule::FxcCTBuffer;
spirvOptions.sBufferLayoutRule = SpirvLayoutRule::FxcSBuffer;
spirvOptions.ampPayloadLayoutRule = SpirvLayoutRule::FxcSBuffer;
} else if (spirvOptions.useGlLayout) {
spirvOptions.cBufferLayoutRule = SpirvLayoutRule::GLSLStd140;
spirvOptions.tBufferLayoutRule = SpirvLayoutRule::GLSLStd430;
spirvOptions.sBufferLayoutRule = SpirvLayoutRule::GLSLStd430;
spirvOptions.ampPayloadLayoutRule = SpirvLayoutRule::GLSLStd430;
} else if (spirvOptions.useScalarLayout) {
spirvOptions.cBufferLayoutRule = SpirvLayoutRule::Scalar;
spirvOptions.tBufferLayoutRule = SpirvLayoutRule::Scalar;
spirvOptions.sBufferLayoutRule = SpirvLayoutRule::Scalar;
spirvOptions.ampPayloadLayoutRule = SpirvLayoutRule::Scalar;
} else {
spirvOptions.cBufferLayoutRule = SpirvLayoutRule::RelaxedGLSLStd140;
spirvOptions.tBufferLayoutRule = SpirvLayoutRule::RelaxedGLSLStd430;
spirvOptions.sBufferLayoutRule = SpirvLayoutRule::RelaxedGLSLStd430;
spirvOptions.ampPayloadLayoutRule = SpirvLayoutRule::RelaxedGLSLStd430;
}
// Set shader module version, source file name, and source file content (if
// needed).
llvm::StringRef source = "";
std::vector<llvm::StringRef> fileNames;
const auto &inputFiles = ci.getFrontendOpts().Inputs;
// File name
if (spirvOptions.debugInfoFile && !inputFiles.empty()) {
for (const auto &inputFile : inputFiles) {
fileNames.push_back(inputFile.getFile());
}
}
// Source code
if (spirvOptions.debugInfoSource) {
const auto &sm = ci.getSourceManager();
const llvm::MemoryBuffer *mainFile =
sm.getBuffer(sm.getMainFileID(), SourceLocation());
source = StringRef(mainFile->getBufferStart(), mainFile->getBufferSize());
}
mainSourceFile = spvBuilder.setDebugSource(spvContext.getMajorVersion(),
spvContext.getMinorVersion(),
fileNames, source);
// Rich DebugInfo DebugSource
if (spirvOptions.debugInfoRich) {
auto *dbgSrc = spvBuilder.createDebugSource(mainSourceFile->getString());
// spvContext.getDebugInfo().insert() inserts {string key, RichDebugInfo}
// pair and returns {{string key, RichDebugInfo}, true /*Success*/}.
// spvContext.getDebugInfo().insert().first->second is a RichDebugInfo.
auto *richDebugInfo =
&spvContext.getDebugInfo()
.insert(
{mainSourceFile->getString(),
RichDebugInfo(dbgSrc,
spvBuilder.createDebugCompilationUnit(dbgSrc))})
.first->second;
spvContext.pushDebugLexicalScope(richDebugInfo,
richDebugInfo->scopeStack.back());
}
if (spirvOptions.debugInfoTool && !spirvOptions.debugInfoVulkan &&
featureManager.isTargetEnvVulkan1p1OrAbove()) {
// Emit OpModuleProcessed to indicate the commit information.
std::string commitHash =
std::string("dxc-commit-hash: ") + clang::getGitCommitHash();
spvBuilder.addModuleProcessed(commitHash);
// Emit OpModuleProcessed to indicate the command line options that were
// used to generate this module.
if (!spirvOptions.inputFile.empty() || !spirvOptions.clOptions.empty()) {
// Using this format: "dxc-cl-option: XXXXXX"
std::string clOptionStr =
"dxc-cl-option: " + spirvOptions.inputFile + spirvOptions.clOptions;
spvBuilder.addModuleProcessed(clOptionStr);
}
}
}
std::vector<SpirvVariable *>
SpirvEmitter::getInterfacesForEntryPoint(SpirvFunction *entryPoint) {
auto stageVars = declIdMapper.collectStageVars(entryPoint);
if (!featureManager.isTargetEnvVulkan1p1Spirv1p4OrAbove())
return stageVars;
// In SPIR-V 1.4 or above, we must include global variables in the 'Interface'
// operands of OpEntryPoint. SpirvModule keeps all global variables, but some
// of them can be duplicated with stage variables kept by declIdMapper. Since
// declIdMapper keeps the mapping between variables with Input or Output
// storage class and their storage class, we have to rely on
// declIdMapper.collectStageVars() to collect them.
llvm::SetVector<SpirvVariable *> interfaces(stageVars.begin(),
stageVars.end());
for (auto *moduleVar : spvBuilder.getModule()->getVariables()) {
if (moduleVar->getStorageClass() != spv::StorageClass::Input &&
moduleVar->getStorageClass() != spv::StorageClass::Output) {
if (auto *varEntry =
declIdMapper.getRayTracingStageVarEntryFunction(moduleVar)) {
if (varEntry != entryPoint)
continue;
}
interfaces.insert(moduleVar);
}
}
std::vector<SpirvVariable *> interfacesInVector;
interfacesInVector.reserve(interfaces.size());
for (auto *interface : interfaces) {
interfacesInVector.push_back(interface);
}
return interfacesInVector;
}
void SpirvEmitter::beginInvocationInterlock(SourceLocation loc,
SourceRange range) {
spvBuilder.addExecutionMode(
entryFunction, declIdMapper.getInterlockExecutionMode(), {}, loc);
spvBuilder.createBeginInvocationInterlockEXT(loc, range);
needsLegalization = true;
}
llvm::StringRef SpirvEmitter::getEntryPointName(const FunctionInfo *entryInfo) {
llvm::StringRef entrypointName = entryInfo->funcDecl->getName();
// If this is the -E HLSL entrypoint and -fspv-entrypoint-name was set,
// rename the SPIR-V entrypoint.
if (entrypointName == hlslEntryFunctionName &&
!spirvOptions.entrypointName.empty()) {
return spirvOptions.entrypointName;
}
return entrypointName;
}
void SpirvEmitter::HandleTranslationUnit(ASTContext &context) {
// Stop translating if there are errors in previous compilation stages.
if (context.getDiagnostics().hasErrorOccurred())
return;
if (spirvOptions.debugInfoRich && !spirvOptions.debugInfoVulkan) {
emitWarning(
"Member functions will not be linked to their class in the "
"debug information. Prefer using -fspv-debug=vulkan-with-source. "
"See https://github.com/KhronosGroup/SPIRV-Registry/issues/203",
{});
}
TranslationUnitDecl *tu = context.getTranslationUnitDecl();
uint32_t numEntryPoints = 0;
// The entry function is the seed of the queue.
for (auto *decl : tu->decls()) {
if (auto *funcDecl = dyn_cast<FunctionDecl>(decl)) {
if (spvContext.isLib()) {
if (const auto *shaderAttr = funcDecl->getAttr<HLSLShaderAttr>()) {
// If we are compiling as a library then add everything that has a
// ShaderAttr.
addFunctionToWorkQueue(getShaderModelKind(shaderAttr->getStage()),
funcDecl, /*isEntryFunction*/ true);
numEntryPoints++;
} else if (funcDecl->getAttr<HLSLExportAttr>()) {
addFunctionToWorkQueue(spvContext.getCurrentShaderModelKind(),
funcDecl, /*isEntryFunction*/ false);
}
} else {
const bool isPrototype = !funcDecl->isThisDeclarationADefinition();
if (funcDecl->getName() == hlslEntryFunctionName && !isPrototype) {
addFunctionToWorkQueue(spvContext.getCurrentShaderModelKind(),
funcDecl, /*isEntryFunction*/ true);
numEntryPoints++;
}
}
} else {
doDecl(decl);
}
if (context.getDiagnostics().hasErrorOccurred())
return;
}
// Translate all functions reachable from the entry function.
// The queue can grow in the meanwhile; so need to keep evaluating
// workQueue.size().
for (uint32_t i = 0; i < workQueue.size(); ++i) {
const FunctionInfo *curEntryOrCallee = workQueue[i];
spvContext.setCurrentShaderModelKind(curEntryOrCallee->shaderModelKind);
doDecl(curEntryOrCallee->funcDecl);
if (context.getDiagnostics().hasErrorOccurred())
return;
}
// Addressing and memory model are required in a valid SPIR-V module.
// It may be promoted based on features used by this shader.
spvBuilder.setMemoryModel(spv::AddressingModel::Logical,
spv::MemoryModel::GLSL450);
// Even though the 'workQueue' grows due to the above loop, the first
// 'numEntryPoints' entries in the 'workQueue' are the ones with the HLSL
// 'shader' attribute, and must therefore be entry functions.
assert(numEntryPoints <= workQueue.size());
for (uint32_t i = 0; i < numEntryPoints; ++i) {
// TODO: assign specific StageVars w.r.t. to entry point
const FunctionInfo *entryInfo = workQueue[i];
assert(entryInfo->isEntryFunction);
spvBuilder.addEntryPoint(
getSpirvShaderStage(
entryInfo->shaderModelKind,
featureManager.isExtensionEnabled(Extension::EXT_mesh_shader)),
entryInfo->entryFunction, getEntryPointName(entryInfo),
getInterfacesForEntryPoint(entryInfo->entryFunction));
}
// Add Location decorations to stage input/output variables.
if (!declIdMapper.decorateStageIOLocations())
return;
// Add descriptor set and binding decorations to resource variables.
if (!declIdMapper.decorateResourceBindings())
return;
// Add Coherent docrations to resource variables.
if (!declIdMapper.decorateResourceCoherent())
return;
// Add source instruction(s)
if (spirvOptions.debugInfoSource || spirvOptions.debugInfoFile) {
std::vector<llvm::StringRef> fileNames;
fileNames.clear();
const auto &sm = context.getSourceManager();
// Add each include file from preprocessor output
for (unsigned int i = 0; i < sm.getNumLineTableFilenames(); i++) {
llvm::StringRef file = sm.getLineTableFilename(i);
if (spirvOptions.debugInfoVulkan) {
getOrCreateRichDebugInfoImpl(file);
} else {
fileNames.push_back(file);
}
}
if (!spirvOptions.debugInfoVulkan) {
spvBuilder.setDebugSource(spvContext.getMajorVersion(),
spvContext.getMinorVersion(), fileNames);
}
}
if (spirvOptions.enableMaximalReconvergence) {
spvBuilder.addExecutionMode(entryFunction,
spv::ExecutionMode::MaximallyReconvergesKHR, {},
SourceLocation());
}
llvm::StringRef denormMode = spirvOptions.floatDenormalMode;
if (!denormMode.empty()) {
if (denormMode.equals_lower("preserve")) {
spvBuilder.addExecutionMode(entryFunction,
spv::ExecutionMode::DenormPreserve, {32}, {});
} else if (denormMode.equals_lower("ftz")) {
spvBuilder.addExecutionMode(
entryFunction, spv::ExecutionMode::DenormFlushToZero, {32}, {});
} else if (denormMode.equals_lower("any")) {
// Do nothing. Since any behavior is allowed, we could optionally choose
// to translate to DenormPreserve or DenormFlushToZero if one was known to
// be more performant on most platforms.
} else {
assert(false && "unsupported denorm value");
}
}
// Output the constructed module.
std::vector<uint32_t> m = spvBuilder.takeModule();
if (context.getDiagnostics().hasErrorOccurred())
return;
if (!UpgradeToVulkanMemoryModelIfNeeded(&m)) {
return;
}
// Check the existance of Texture and Sampler with
// [[vk::combinedImageSampler]] for the same descriptor set and binding.
auto resourceInfoForSampledImages =
spvContext.getResourceInfoForSampledImages();
auto dsetBindingWithoutTextureOrSampler =
getDSetBindingWithoutTextureOrSampler(resourceInfoForSampledImages);
if (dsetBindingWithoutTextureOrSampler.descriptor_set !=
std::numeric_limits<uint32_t>::max()) {
emitFatalError(
"Texture or Sampler with [[vk::combinedImageSampler]] attribute is "
"missing for descriptor set and binding: %0, %1",
{})
<< dsetBindingWithoutTextureOrSampler.descriptor_set
<< dsetBindingWithoutTextureOrSampler.binding;
return;
}
auto dsetbindingsToCombineImageSampler =
collectDSetBindingsToCombineSampledImage(resourceInfoForSampledImages);
// In order to flatten composite resources, we must also unroll loops.
// Therefore we should run legalization before optimization.
needsLegalization =
needsLegalization || declIdMapper.requiresLegalization() ||
spirvOptions.flattenResourceArrays || spirvOptions.reduceLoadSize ||
declIdMapper.requiresFlatteningCompositeResources() ||
!dsetbindingsToCombineImageSampler.empty() ||
spirvOptions.signaturePacking;
// Run legalization passes
if (spirvOptions.codeGenHighLevel) {
beforeHlslLegalization = needsLegalization;
} else {
if (needsLegalization) {
std::string messages;
if (!spirvToolsLegalize(&m, &messages,
&dsetbindingsToCombineImageSampler)) {
emitFatalError("failed to legalize SPIR-V: %0", {}) << messages;
emitNote("please file a bug report on "
"https://github.com/Microsoft/DirectXShaderCompiler/issues "
"with source code if possible",
{});
return;
} else if (!messages.empty()) {
emitWarning("SPIR-V legalization: %0", {}) << messages;
}
}
if (theCompilerInstance.getCodeGenOpts().OptimizationLevel > 0) {
// Run optimization passes
std::string messages;
if (!spirvToolsOptimize(&m, &messages)) {
emitFatalError("failed to optimize SPIR-V: %0", {}) << messages;
emitNote("please file a bug report on "
"https://github.com/Microsoft/DirectXShaderCompiler/issues "
"with source code if possible",
{});
return;
}
}
// Fixup debug instruction opcodes: change the opcode to
// OpExtInstWithForwardRefsKHR is the instruction at least one forward
// reference.
if (spirvOptions.debugInfoRich) {
std::string messages;
if (!spirvToolsFixupOpExtInst(&m, &messages)) {
emitFatalError("failed to fix OpExtInst opcodes: %0", {}) << messages;
emitNote("please file a bug report on "
"https://github.com/Microsoft/DirectXShaderCompiler/issues "
"with source code if possible",
{});
return;
} else if (!messages.empty()) {
emitWarning("SPIR-V fix-opextinst-opcodes: %0", {}) << messages;
}
}
// Trim unused capabilities.
// When optimizations are enabled, some optimization passes like DCE could
// make some capabilities useless. To avoid logic duplication between this
// pass, and DXC, DXC generates some capabilities unconditionally. This
// means we should run this pass, even when optimizations are disabled.
{
std::string messages;
if (!spirvToolsTrimCapabilities(&m, &messages)) {
emitFatalError("failed to trim capabilities: %0", {}) << messages;
emitNote("please file a bug report on "
"https://github.com/Microsoft/DirectXShaderCompiler/issues "
"with source code if possible",
{});
return;
} else if (!messages.empty()) {
emitWarning("SPIR-V capability trimming: %0", {}) << messages;
}
}
}
// Validate the generated SPIR-V code
if (!spirvOptions.disableValidation) {
std::string messages;
if (!spirvToolsValidate(&m, &messages)) {
emitFatalError("generated SPIR-V is invalid: %0", {}) << messages;
emitNote("please file a bug report on "
"https://github.com/Microsoft/DirectXShaderCompiler/issues "
"with source code if possible",
{});
return;
}
}