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GlobalVariableRewriter.cpp
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/*
* Copyright (c) 2023 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "GlobalVariableRewriter.h"
#include "AST.h"
#include "ASTIdentifier.h"
#include "ASTVisitor.h"
#include "CallGraph.h"
#include "WGSL.h"
#include "WGSLShaderModule.h"
#include <wtf/DataLog.h>
#include <wtf/HashMap.h>
#include <wtf/ListHashSet.h>
#include <wtf/SetForScope.h>
#include <wtf/text/MakeString.h>
namespace WGSL {
constexpr bool shouldLogGlobalVariableRewriting = false;
class RewriteGlobalVariables : public AST::Visitor {
public:
RewriteGlobalVariables(ShaderModule& shaderModule, const HashMap<String, PipelineLayout*>& pipelineLayouts, HashMap<String, Reflection::EntryPointInformation>& entryPointInformations)
: AST::Visitor()
, m_shaderModule(shaderModule)
, m_pipelineLayouts(pipelineLayouts)
, m_entryPointInformations(entryPointInformations)
{
}
std::optional<Error> run();
void visit(AST::Function&) override;
void visit(AST::Variable&) override;
void visit(AST::Parameter&) override;
void visit(AST::CompoundStatement&) override;
void visit(AST::AssignmentStatement&) override;
void visit(AST::VariableStatement&) override;
void visit(AST::PhonyAssignmentStatement&) override;
void visit(AST::CompoundAssignmentStatement&) override;
void visit(AST::Expression&) override;
private:
struct Global {
struct Resource {
unsigned group;
unsigned binding;
};
std::optional<Resource> resource;
AST::Variable* declaration;
};
template<typename Value>
using IndexMap = HashMap<uint64_t, Value, WTF::IntHash<uint64_t>, WTF::UnsignedWithZeroKeyHashTraits<uint64_t>>;
using UsedResources = IndexMap<IndexMap<Global*>>;
using UsedPrivateGlobals = Vector<Global*>;
struct UsedGlobals {
UsedResources resources;
UsedPrivateGlobals privateGlobals;
};
struct Insertion {
AST::Statement* statement;
unsigned index;
};
static AST::Identifier argumentBufferParameterName(unsigned group);
static AST::Identifier argumentBufferStructName(unsigned group);
static AST::Identifier dynamicOffsetVariableName();
void def(const AST::Identifier&, AST::Variable*);
std::optional<Error> collectGlobals();
std::optional<Error> visitEntryPoint(const CallGraph::EntryPoint&);
void visitCallee(const CallGraph::Callee&);
Result<UsedGlobals> determineUsedGlobals(const AST::Function&);
void collectDynamicOffsetGlobals(const PipelineLayout&);
void usesOverride(AST::Variable&);
Vector<unsigned> insertStructs(const UsedResources&);
Result<Vector<unsigned>> insertStructs(PipelineLayout&, const UsedResources&);
AST::StructureMember& createArgumentBufferEntry(unsigned binding, AST::Variable&);
AST::StructureMember& createArgumentBufferEntry(unsigned binding, const SourceSpan&, const String& name, AST::Expression& type);
void finalizeArgumentBufferStruct(unsigned group, Vector<std::pair<unsigned, AST::StructureMember*>>&);
void insertDynamicOffsetsBufferIfNeeded(const AST::Function&);
void insertDynamicOffsetsBufferIfNeeded(const SourceSpan&, const AST::Function&);
void insertParameter(const SourceSpan&, const AST::Function&, unsigned, AST::Identifier&&, AST::Expression* = nullptr, AST::ParameterRole = AST::ParameterRole::BindGroup);
void insertParameters(AST::Function&, const Vector<unsigned>&);
void insertMaterializations(AST::Function&, const UsedResources&);
void insertLocalDefinitions(AST::Function&, const UsedPrivateGlobals&);
const Global* readVariable(AST::IdentifierExpression&);
void insertBeforeCurrentStatement(AST::Statement&);
AST::Expression& bufferLengthType();
AST::Expression& bufferLengthReferenceType();
// zero initialization
void initializeVariables(AST::Function&, const UsedPrivateGlobals&, size_t);
void insertWorkgroupBarrier(AST::Function&, size_t);
AST::Identifier& findOrInsertLocalInvocationIndex(AST::Function&);
AST::Statement::List storeInitialValue(const UsedPrivateGlobals&);
void storeInitialValue(AST::Expression&, AST::Statement::List&, unsigned);
void packResource(AST::Variable&);
void packArrayResource(AST::Variable&, const Types::Array*);
void packStructResource(AST::Variable&, const Types::Struct*);
const Type* packType(const Type*);
const Type* packStructType(const Types::Struct*);
const Type* packArrayType(const Types::Array*);
void updateReference(AST::Variable&, AST::Expression&);
Packing pack(Packing, AST::Expression&);
Packing getPacking(AST::IdentifierExpression&);
Packing getPacking(AST::FieldAccessExpression&);
Packing getPacking(AST::IndexAccessExpression&);
Packing getPacking(AST::BinaryExpression&);
Packing getPacking(AST::UnaryExpression&);
Packing getPacking(AST::CallExpression&);
Packing getPacking(AST::IdentityExpression&);
Packing packingForType(const Type*);
AST::IdentifierExpression& getBase(AST::Expression&, unsigned&);
ShaderModule& m_shaderModule;
HashMap<String, Global> m_globals;
HashMap<std::tuple<unsigned, unsigned>, AST::Variable*> m_globalsByBinding;
IndexMap<Vector<std::pair<unsigned, String>>> m_groupBindingMap;
IndexMap<const Type*> m_structTypes;
HashMap<String, AST::Variable*> m_defs;
ListHashSet<String> m_reads;
HashMap<AST::Function*, ListHashSet<String>> m_lengthParameters;
HashMap<AST::Function*, ListHashSet<String>> m_visitedFunctions;
Reflection::EntryPointInformation* m_entryPointInformation { nullptr };
HashMap<uint32_t, uint32_t, DefaultHash<uint32_t>, WTF::UnsignedWithZeroKeyHashTraits<uint32_t>> m_generateLayoutGroupMapping;
PipelineLayout* m_generatedLayout { nullptr };
unsigned m_constantId { 0 };
unsigned m_currentStatementIndex { 0 };
Vector<Insertion> m_pendingInsertions;
HashMap<const Types::Struct*, const Type*> m_packedStructTypes;
ShaderStage m_stage { ShaderStage::Vertex };
const HashMap<String, PipelineLayout*>& m_pipelineLayouts;
HashMap<String, Reflection::EntryPointInformation>& m_entryPointInformations;
HashMap<AST::Variable*, AST::Variable*> m_bufferLengthMap;
AST::Expression* m_bufferLengthType { nullptr };
AST::Expression* m_bufferLengthReferenceType { nullptr };
AST::Function* m_currentFunction { nullptr };
HashMap<std::pair<unsigned, unsigned>, unsigned> m_globalsUsingDynamicOffset;
HashSet<AST::Expression*> m_doNotUnpack;
CheckedUint32 m_combinedFunctionVariablesSize;
};
std::optional<Error> RewriteGlobalVariables::run()
{
dataLogLnIf(shouldLogGlobalVariableRewriting, "BEGIN: GlobalVariableRewriter");
if (auto error = collectGlobals())
return error;
for (auto& entryPoint : m_shaderModule.callGraph().entrypoints()) {
auto maybeError = visitEntryPoint(entryPoint);
if (maybeError.has_value())
return maybeError;
}
dataLogLnIf(shouldLogGlobalVariableRewriting, "END: GlobalVariableRewriter");
return std::nullopt;
}
void RewriteGlobalVariables::visitCallee(const CallGraph::Callee& callee)
{
const auto& updateCallee = [&] {
for (auto& read : m_reads) {
auto it = m_globals.find(read);
RELEASE_ASSERT(it != m_globals.end());
auto& global = it->value;
AST::Expression* type;
if (global.declaration->flavor() == AST::VariableFlavor::Var)
type = global.declaration->maybeReferenceType();
else {
ASSERT(global.declaration->flavor() == AST::VariableFlavor::Override);
type = global.declaration->maybeTypeName();
if (!type) {
auto* storeType = global.declaration->storeType();
auto& typeExpression = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(SourceSpan::empty(), AST::Identifier::make(storeType->toString()));
typeExpression.m_inferredType = storeType;
type = &typeExpression;
}
}
ASSERT(type);
auto parameterRole = global.declaration->role() == AST::VariableRole::PackedResource ? AST::ParameterRole::PackedResource : AST::ParameterRole::UserDefined;
m_shaderModule.append(callee.target->parameters(), m_shaderModule.astBuilder().construct<AST::Parameter>(
SourceSpan::empty(),
AST::Identifier::make(read),
*type,
AST::Attribute::List { },
parameterRole
));
}
auto it = m_lengthParameters.find(callee.target);
if (it != m_lengthParameters.end() && !it->value.isEmpty()) {
auto& lengthType = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(SourceSpan::empty(), AST::Identifier::make("u32"_s));
lengthType.m_inferredType = m_shaderModule.types().u32Type();
for (auto& length : it->value) {
auto lengthName = makeString("__"_s, length, "_ArrayLength"_s);
if (m_reads.contains(lengthName))
continue;
m_shaderModule.append(callee.target->parameters(), m_shaderModule.astBuilder().construct<AST::Parameter>(
SourceSpan::empty(),
AST::Identifier::make(lengthName),
lengthType,
AST::Attribute::List { },
AST::ParameterRole::UserDefined
));
}
}
};
const auto& updateCallSites = [&] {
for (auto& read : m_reads) {
for (auto& [_, call] : callee.callSites) {
auto it = m_globals.find(read);
RELEASE_ASSERT(it != m_globals.end());
auto& global = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(
SourceSpan::empty(),
AST::Identifier::make(read)
);
global.m_inferredType = it->value.declaration->storeType();
m_shaderModule.append(call->arguments(), global);
m_doNotUnpack.add(&global);
}
}
auto it = m_lengthParameters.find(callee.target);
if (it != m_lengthParameters.end() && !it->value.isEmpty()) {
auto& lengthType = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(SourceSpan::empty(), AST::Identifier::make("u32"_s));
lengthType.m_inferredType = m_shaderModule.types().u32Type();
for (auto& lengthParameter : it->value) {
auto lengthName = makeString("__"_s, lengthParameter, "_ArrayLength"_s);
if (m_reads.contains(lengthName))
continue;
unsigned index = 0;
for (auto& parameter : callee.target->parameters()) {
if (parameter.name() == lengthParameter)
break;
++index;
}
for (auto& [caller, call] : callee.callSites) {
auto& argument = call->arguments()[index];
unsigned arrayOffset = 0;
auto& base = getBase(argument, arrayOffset);
auto& identifier = base.identifier();
auto result = m_lengthParameters.add(caller, ListHashSet<String> { });
result.iterator->value.add(identifier);
auto lengthName = makeString("__"_s, identifier, "_ArrayLength"_s);
auto& length = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(
SourceSpan::empty(),
AST::Identifier::make(lengthName)
);
length.m_inferredType = m_shaderModule.types().u32Type();
AST::Expression* lhs = &length;
if (arrayOffset) {
auto& arrayOffsetExpression = m_shaderModule.astBuilder().construct<AST::Unsigned32Literal>(
SourceSpan::empty(),
arrayOffset
);
arrayOffsetExpression.m_inferredType = m_shaderModule.types().u32Type();
lhs = &m_shaderModule.astBuilder().construct<AST::BinaryExpression>(
SourceSpan::empty(),
length,
arrayOffsetExpression,
AST::BinaryOperation::Subtract
);
lhs->m_inferredType = m_shaderModule.types().u32Type();
}
m_shaderModule.append(call->arguments(), *lhs);
}
}
}
};
auto it = m_visitedFunctions.find(callee.target);
if (it != m_visitedFunctions.end()) {
dataLogLnIf(shouldLogGlobalVariableRewriting, "> Already visited callee: ", callee.target->name());
m_reads = it->value;
updateCallSites();
return;
}
dataLogLnIf(shouldLogGlobalVariableRewriting, "> Visiting callee: ", callee.target->name());
visit(*callee.target);
updateCallee();
updateCallSites();
m_visitedFunctions.add(callee.target, m_reads);
}
void RewriteGlobalVariables::visit(AST::Function& function)
{
ListHashSet<String> reads;
for (auto& callee : m_shaderModule.callGraph().callees(function)) {
visitCallee(callee);
if (hasError())
return;
for (const auto& read : m_reads)
reads.add(read);
}
m_reads = WTFMove(reads);
m_defs.clear();
m_combinedFunctionVariablesSize = 0;
def(function.name(), nullptr);
m_currentFunction = &function;
AST::Visitor::visit(function);
m_currentFunction = nullptr;
// https://www.w3.org/TR/WGSL/#limits
constexpr unsigned maximumCombinedFunctionVariablesSize = 8192;
if (UNLIKELY(m_combinedFunctionVariablesSize.hasOverflowed() || m_combinedFunctionVariablesSize.value() > maximumCombinedFunctionVariablesSize))
setError(Error(makeString("The combined byte size of all variables in this function exceeds "_s, String::number(maximumCombinedFunctionVariablesSize), " bytes"_s), function.span()));
}
void RewriteGlobalVariables::visit(AST::Parameter& parameter)
{
def(parameter.name(), nullptr);
AST::Visitor::visit(parameter);
}
void RewriteGlobalVariables::visit(AST::Variable& variable)
{
def(variable.name(), &variable);
AST::Visitor::visit(variable);
}
void RewriteGlobalVariables::visit(AST::CompoundStatement& statement)
{
auto indexScope = SetForScope(m_currentStatementIndex, 0);
auto insertionScope = SetForScope(m_pendingInsertions, Vector<Insertion>());
for (auto& statement : statement.statements()) {
AST::Visitor::visit(statement);
++m_currentStatementIndex;
}
unsigned offset = 0;
for (auto& insertion : m_pendingInsertions) {
m_shaderModule.insert(statement.statements(), insertion.index + offset, AST::Statement::Ref(*insertion.statement));
++offset;
}
}
void RewriteGlobalVariables::visit(AST::CompoundAssignmentStatement& statement)
{
Packing lhsPacking = pack(Packing::Unpacked, statement.leftExpression());
pack(lhsPacking, statement.rightExpression());
}
void RewriteGlobalVariables::visit(AST::AssignmentStatement& statement)
{
Packing lhsPacking = pack(Packing::Either, statement.lhs());
ASSERT(lhsPacking != Packing::Either);
if (lhsPacking == Packing::PackedVec3)
lhsPacking = Packing::Either;
pack(lhsPacking, statement.rhs());
}
void RewriteGlobalVariables::visit(AST::VariableStatement& statement)
{
if (statement.variable().flavor() == AST::VariableFlavor::Var)
m_combinedFunctionVariablesSize += statement.variable().storeType()->size();
if (auto* initializer = statement.variable().maybeInitializer())
pack(static_cast<Packing>(Packing::Unpacked), *initializer);
}
void RewriteGlobalVariables::visit(AST::PhonyAssignmentStatement& statement)
{
pack(Packing::Either, statement.rhs());
}
void RewriteGlobalVariables::visit(AST::Expression& expression)
{
pack(Packing::Unpacked, expression);
}
Packing RewriteGlobalVariables::pack(Packing expectedPacking, AST::Expression& expression)
{
if (m_doNotUnpack.contains(&expression))
return expectedPacking;
const auto& visitAndReplace = [&](auto& expression) -> Packing {
auto packing = getPacking(expression);
if (expectedPacking & packing)
return packing;
auto* type = expression.inferredType();
if (auto* referenceType = std::get_if<Types::Reference>(type))
type = referenceType->element;
ASCIILiteral operation;
if (std::holds_alternative<Types::Struct>(*type)) {
if (!type->isConstructible())
return packing;
operation = packing & Packing::Packed ? "__unpack"_s : "__pack"_s;
} else if (std::holds_alternative<Types::Array>(*type)) {
if (packing & Packing::Packed) {
operation = "__unpack"_s;
m_shaderModule.setUsesUnpackArray();
} else {
operation = "__pack"_s;
m_shaderModule.setUsesPackArray();
}
} else {
if (packing & Packing::Packed) {
operation = "__unpack"_s;
m_shaderModule.setUsesUnpackVector();
} else {
operation = "__pack"_s;
m_shaderModule.setUsesPackVector();
}
}
RELEASE_ASSERT(!operation.isNull());
auto& callee = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(
SourceSpan::empty(),
AST::Identifier::make(operation)
);
callee.m_inferredType = m_shaderModule.types().bottomType();
auto& argument = m_shaderModule.astBuilder().construct<std::remove_cvref_t<decltype(expression)>>(expression);
auto& call = m_shaderModule.astBuilder().construct<AST::CallExpression>(
SourceSpan::empty(),
callee,
AST::Expression::List { argument }
);
call.m_inferredType = argument.inferredType();
m_shaderModule.replace(expression, call);
return static_cast<Packing>(Packing::Either ^ packing);
};
switch (expression.kind()) {
case AST::NodeKind::IdentifierExpression:
return visitAndReplace(uncheckedDowncast<AST::IdentifierExpression>(expression));
case AST::NodeKind::FieldAccessExpression:
return visitAndReplace(uncheckedDowncast<AST::FieldAccessExpression>(expression));
case AST::NodeKind::IndexAccessExpression:
return visitAndReplace(uncheckedDowncast<AST::IndexAccessExpression>(expression));
case AST::NodeKind::BinaryExpression:
return visitAndReplace(uncheckedDowncast<AST::BinaryExpression>(expression));
case AST::NodeKind::UnaryExpression:
return visitAndReplace(uncheckedDowncast<AST::UnaryExpression>(expression));
case AST::NodeKind::CallExpression:
return visitAndReplace(uncheckedDowncast<AST::CallExpression>(expression));
case AST::NodeKind::IdentityExpression:
return visitAndReplace(uncheckedDowncast<AST::IdentityExpression>(expression));
default:
AST::Visitor::visit(expression);
return Packing::Unpacked;
}
}
Packing RewriteGlobalVariables::getPacking(AST::IdentifierExpression& identifier)
{
auto* global = readVariable(identifier);
if (global && global->resource.has_value())
return packingForType(identifier.inferredType());
return Packing::Unpacked;
}
Packing RewriteGlobalVariables::getPacking(AST::FieldAccessExpression& expression)
{
auto* baseType = expression.base().inferredType();
if (!baseType) {
// FIXME: all AST nodes should have an inferred type, but we create field
// access nodes from the EntryPointRewriter which don't have a trivial
// type, so we work around it by returning unpacked since those are only
// used for marshalling inputs/outputs and don't need to packed/unpacked.
return Packing::Unpacked;
}
if (auto* referenceType = std::get_if<Types::Reference>(baseType))
baseType = referenceType->element;
bool isPointer = false;
if (auto* pointerType = std::get_if<Types::Pointer>(baseType)) {
isPointer = true;
baseType = pointerType->element;
}
if (std::holds_alternative<Types::Vector>(*baseType)) {
if (std::holds_alternative<Types::Vector>(*expression.inferredType())) {
if (isPointer) {
auto& dereference = m_shaderModule.astBuilder().construct<AST::UnaryExpression>(
expression.base().span(),
expression.base(),
AST::UnaryOperation::Dereference
);
dereference.m_inferredType = baseType;
auto& fieldAccessExpression = m_shaderModule.astBuilder().construct<AST::FieldAccessExpression>(
expression.span(),
dereference,
AST::Identifier::make(expression.fieldName())
);
fieldAccessExpression.m_inferredType = expression.inferredType();
m_shaderModule.replace(expression, fieldAccessExpression);
}
pack(Packing::Unpacked, expression.base());
} else
pack(Packing::Either, expression.base());
return Packing::Unpacked;
}
auto basePacking = pack(Packing::Either, expression.base());
if (basePacking & Packing::Unpacked)
return Packing::Unpacked;
ASSERT(std::holds_alternative<Types::Struct>(*baseType));
auto& structType = std::get<Types::Struct>(*baseType);
auto* fieldType = structType.fields.get(expression.originalFieldName());
return packingForType(fieldType);
}
Packing RewriteGlobalVariables::getPacking(AST::IndexAccessExpression& expression)
{
auto basePacking = pack(Packing::Either, expression.base());
pack(Packing::Unpacked, expression.index());
if (basePacking & Packing::Unpacked)
return Packing::Unpacked;
auto* baseType = expression.base().inferredType();
if (auto* referenceType = std::get_if<Types::Reference>(baseType))
baseType = referenceType->element;
if (auto* pointerType = std::get_if<Types::Pointer>(baseType))
baseType = pointerType->element;
if (std::holds_alternative<Types::Vector>(*baseType))
return Packing::Unpacked;
ASSERT(std::holds_alternative<Types::Array>(*baseType));
auto& arrayType = std::get<Types::Array>(*baseType);
return packingForType(arrayType.element);
}
Packing RewriteGlobalVariables::getPacking(AST::BinaryExpression& expression)
{
pack(Packing::Unpacked, expression.leftExpression());
pack(Packing::Unpacked, expression.rightExpression());
return Packing::Unpacked;
}
Packing RewriteGlobalVariables::getPacking(AST::UnaryExpression& expression)
{
if (expression.operation() == AST::UnaryOperation::AddressOf || expression.operation() == AST::UnaryOperation::Dereference)
return pack(Packing::Either, expression.expression());
return pack(Packing::Unpacked, expression.expression());
}
Packing RewriteGlobalVariables::getPacking(AST::IdentityExpression& expression)
{
return pack(Packing::Either, expression.expression());
}
Packing RewriteGlobalVariables::getPacking(AST::CallExpression& call)
{
if (auto target = dynamicDowncast<AST::IdentifierExpression>(call.target())) {
if (target->identifier() == "arrayLength"_s) {
ASSERT(call.arguments().size() == 1);
auto& arrayPointer = call.arguments()[0];
unsigned arrayOffset = 0;
auto& base = getBase(arrayPointer, arrayOffset);
auto& identifier = base.identifier();
if (!m_globals.contains(identifier)) {
auto result = m_lengthParameters.add(m_currentFunction, ListHashSet<String> { });
result.iterator->value.add(identifier);
}
auto lengthName = makeString("__"_s, identifier, "_ArrayLength"_s);
auto& length = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(
SourceSpan::empty(),
AST::Identifier::make(lengthName)
);
length.m_inferredType = m_shaderModule.types().u32Type();
auto* arrayPointerType = arrayPointer.inferredType();
ASSERT(std::holds_alternative<Types::Pointer>(*arrayPointerType));
auto& arrayType = std::get<Types::Pointer>(*arrayPointerType).element;
ASSERT(std::holds_alternative<Types::Array>(*arrayType));
auto* elementType = std::get<Types::Array>(*arrayType).element;
auto arrayStride = elementType->size();
arrayStride = WTF::roundUpToMultipleOf(elementType->alignment(), arrayStride);
auto& strideExpression = m_shaderModule.astBuilder().construct<AST::Unsigned32Literal>(
SourceSpan::empty(),
arrayStride
);
strideExpression.m_inferredType = m_shaderModule.types().u32Type();
AST::Expression* lhs = &length;
if (arrayOffset) {
auto& arrayOffsetExpression = m_shaderModule.astBuilder().construct<AST::Unsigned32Literal>(
SourceSpan::empty(),
arrayOffset
);
arrayOffsetExpression.m_inferredType = m_shaderModule.types().u32Type();
lhs = &m_shaderModule.astBuilder().construct<AST::BinaryExpression>(
SourceSpan::empty(),
length,
arrayOffsetExpression,
AST::BinaryOperation::Subtract
);
lhs->m_inferredType = m_shaderModule.types().u32Type();
}
m_shaderModule.setUsesDivision();
auto& elementCount = m_shaderModule.astBuilder().construct<AST::BinaryExpression>(
SourceSpan::empty(),
*lhs,
strideExpression,
AST::BinaryOperation::Divide
);
elementCount.m_inferredType = m_shaderModule.types().u32Type();
m_shaderModule.replace(call, elementCount);
// mark both the array and array length as read
readVariable(base);
readVariable(length);
return Packing::Unpacked;
}
}
for (auto& argument : call.arguments())
pack(Packing::Unpacked, argument);
return Packing::Unpacked;
}
Packing RewriteGlobalVariables::packingForType(const Type* type)
{
return type->packing();
}
AST::IdentifierExpression& RewriteGlobalVariables::getBase(AST::Expression& expression, unsigned& arrayOffset)
{
if (auto* identityExpression = dynamicDowncast<AST::IdentityExpression>(expression))
return getBase(identityExpression->expression(), arrayOffset);
if (auto* unaryExpression = dynamicDowncast<AST::UnaryExpression>(expression))
return getBase(unaryExpression->expression(), arrayOffset);
if (auto* fieldAccess = dynamicDowncast<AST::FieldAccessExpression>(expression)) {
auto& base = fieldAccess->base();
auto* type = base.inferredType();
if (auto* reference = std::get_if<Types::Reference>(type))
type = reference->element;
if (auto* pointer = std::get_if<Types::Pointer>(type))
type = pointer->element;
auto& structure = std::get<Types::Struct>(*type).structure;
auto& lastMember = structure.members().last();
RELEASE_ASSERT(lastMember.name().id() == fieldAccess->fieldName().id());
arrayOffset += lastMember.offset();
return getBase(base, arrayOffset);
}
if (auto* identifierExpression = dynamicDowncast<AST::IdentifierExpression>(expression))
return *identifierExpression;
RELEASE_ASSERT_NOT_REACHED();
}
static unsigned buffersForStage(const Configuration& configuration, ShaderStage stage)
{
switch (stage) {
case ShaderStage::Compute:
return configuration.maxBuffersForComputeStage;
case ShaderStage::Vertex:
return configuration.maxBuffersPlusVertexBuffersForVertexStage;
case ShaderStage::Fragment:
return configuration.maxBuffersForFragmentStage;
}
}
std::optional<Error> RewriteGlobalVariables::collectGlobals()
{
Vector<std::tuple<AST::Variable*, unsigned>> bufferLengths;
// we can't use a range-based for loop here since we might create new structs
// and insert them into the declarations vector
auto size = m_shaderModule.declarations().size();
for (unsigned i = 0; i < size; ++i) {
auto* globalVar = dynamicDowncast<AST::Variable>(m_shaderModule.declarations()[i]);
if (!globalVar)
continue;
std::optional<Global::Resource> resource;
if (globalVar->group().has_value()) {
RELEASE_ASSERT(globalVar->binding().has_value());
unsigned bufferIndex = *globalVar->group();
auto buffersCountForStage = buffersForStage(m_shaderModule.configuration(), m_stage);
if (bufferIndex >= buffersCountForStage)
return Error(makeString("global has buffer index "_s, bufferIndex, " which exceeds the max allowed buffer index "_s, buffersCountForStage, " for this stage"_s), SourceSpan::empty());
resource = { *globalVar->group(), *globalVar->binding() };
}
dataLogLnIf(shouldLogGlobalVariableRewriting, "> Found global: ", globalVar->name(), ", isResource: ", resource.has_value() ? "yes" : "no");
auto result = m_globals.add(globalVar->name(), Global {
resource,
globalVar
});
ASSERT_UNUSED(result, result.isNewEntry);
if (resource.has_value()) {
m_globalsByBinding.add({ resource->group + 1, resource->binding + 1 }, globalVar);
auto result = m_groupBindingMap.add(resource->group, Vector<std::pair<unsigned, String>>());
result.iterator->value.append({ resource->binding, globalVar->name() });
packResource(*globalVar);
if (!m_generatedLayout || globalVar->maybeReferenceType()->inferredType()->containsRuntimeArray())
bufferLengths.append({ globalVar, resource->group });
}
}
for (auto& [_, vector] : m_groupBindingMap)
std::sort(vector.begin(), vector.end(), [&](auto& a, auto& b) { return a.first < b.first; });
if (!bufferLengths.isEmpty()) {
for (const auto& [variable, group] : bufferLengths) {
auto name = AST::Identifier::make(makeString("__"_s, variable->name(), "_ArrayLength"_s));
auto& lengthVariable = m_shaderModule.astBuilder().construct<AST::Variable>(
SourceSpan::empty(),
AST::VariableFlavor::Var,
AST::Identifier::make(name),
&bufferLengthType(),
nullptr
);
lengthVariable.m_referenceType = &bufferLengthReferenceType();
auto it = m_groupBindingMap.find(group);
ASSERT(it != m_groupBindingMap.end());
auto binding = it->value.last().first + 1;
auto result = m_globals.add(name, Global {
{ {
group,
binding,
} },
&lengthVariable
});
m_bufferLengthMap.add(variable, &lengthVariable);
ASSERT_UNUSED(result, result.isNewEntry);
it->value.append({ binding, name });
}
}
return std::nullopt;
}
AST::Expression& RewriteGlobalVariables::bufferLengthType()
{
if (m_bufferLengthType)
return *m_bufferLengthType;
m_bufferLengthType = &m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(SourceSpan::empty(), AST::Identifier::make("u32"_s));
m_bufferLengthType->m_inferredType = m_shaderModule.types().u32Type();
return *m_bufferLengthType;
}
AST::Expression& RewriteGlobalVariables::bufferLengthReferenceType()
{
if (m_bufferLengthReferenceType)
return *m_bufferLengthReferenceType;
m_bufferLengthReferenceType = &m_shaderModule.astBuilder().construct<AST::ReferenceTypeExpression>(
SourceSpan::empty(),
bufferLengthType()
);
m_bufferLengthReferenceType->m_inferredType = m_shaderModule.types().referenceType(AddressSpace::Handle, m_shaderModule.types().u32Type(), AccessMode::Read);
return *m_bufferLengthReferenceType;
}
void RewriteGlobalVariables::packResource(AST::Variable& global)
{
auto* maybeTypeName = global.maybeTypeName();
ASSERT(maybeTypeName);
auto* resolvedType = maybeTypeName->inferredType();
if (auto* arrayType = std::get_if<Types::Array>(resolvedType)) {
packArrayResource(global, arrayType);
return;
}
if (auto* structType = std::get_if<Types::Struct>(resolvedType)) {
packStructResource(global, structType);
return;
}
}
void RewriteGlobalVariables::packStructResource(AST::Variable& global, const Types::Struct* structType)
{
const Type* packedStructType = packStructType(structType);
if (!packedStructType)
return;
auto& packedType = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(
SourceSpan::empty(),
AST::Identifier::make(std::get<Types::Struct>(*packedStructType).structure.name().id())
);
packedType.m_inferredType = packedStructType;
auto& namedTypeName = downcast<AST::IdentifierExpression>(*global.maybeTypeName());
m_shaderModule.replace(namedTypeName, packedType);
updateReference(global, packedType);
m_shaderModule.replace(&global.role(), AST::VariableRole::PackedResource);
}
void RewriteGlobalVariables::packArrayResource(AST::Variable& global, const Types::Array* arrayType)
{
const Type* packedArrayType = packArrayType(arrayType);
if (!packedArrayType)
return;
const Type* packedElementType = std::get<Types::Array>(*packedArrayType).element;
auto& packedType = m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(
SourceSpan::empty(),
AST::Identifier::make("__PackedArray"_s) // This name is not used by the codegen
);
packedType.m_inferredType = packedElementType;
auto& arrayTypeName = downcast<AST::ArrayTypeExpression>(*global.maybeTypeName());
auto& packedArrayTypeName = m_shaderModule.astBuilder().construct<AST::ArrayTypeExpression>(
arrayTypeName.span(),
&packedType,
arrayTypeName.maybeElementCount()
);
packedArrayTypeName.m_inferredType = packedArrayType;
m_shaderModule.replace(arrayTypeName, packedArrayTypeName);
updateReference(global, packedArrayTypeName);
m_shaderModule.replace(&global.role(), AST::VariableRole::PackedResource);
}
void RewriteGlobalVariables::updateReference(AST::Variable& global, AST::Expression& packedType)
{
auto* maybeReference = global.maybeReferenceType();
ASSERT(maybeReference);
auto& reference = downcast<AST::ReferenceTypeExpression>(*maybeReference);
auto* referenceType = std::get_if<Types::Reference>(reference.inferredType());
ASSERT(referenceType);
auto& packedTypeReference = m_shaderModule.astBuilder().construct<AST::ReferenceTypeExpression>(
SourceSpan::empty(),
packedType
);
packedTypeReference.m_inferredType = m_shaderModule.types().referenceType(
referenceType->addressSpace,
packedType.inferredType(),
referenceType->accessMode
);
m_shaderModule.replace(reference, packedTypeReference);
}
const Type* RewriteGlobalVariables::packType(const Type* type)
{
if (auto* structType = std::get_if<Types::Struct>(type))
return packStructType(structType);
if (auto* arrayType = std::get_if<Types::Array>(type))
return packArrayType(arrayType);
if (auto* vectorType = std::get_if<Types::Vector>(type)) {
if (vectorType->size == 3) {
m_shaderModule.setUsesPackedVec3();
return type;
}
}
return nullptr;
}
const Type* RewriteGlobalVariables::packStructType(const Types::Struct* structType)
{
if (structType->structure.role() == AST::StructureRole::UserDefinedResource)
return m_packedStructTypes.get(structType);
// Ensure we pack nested structs
bool packedAnyMember = false;
for (auto& member : structType->structure.members()) {
if (packType(member.type().inferredType()))
packedAnyMember = true;
}
if (!packedAnyMember && !structType->structure.hasSizeOrAlignmentAttributes())
return nullptr;
ASSERT(structType->structure.role() == AST::StructureRole::UserDefined);
m_shaderModule.replace(&structType->structure.role(), AST::StructureRole::UserDefinedResource);
String packedStructName = makeString("__"_s, structType->structure.name(), "_Packed"_s);
auto& packedStruct = m_shaderModule.astBuilder().construct<AST::Structure>(
SourceSpan::empty(),
AST::Identifier::make(packedStructName),
AST::StructureMember::List(structType->structure.members()),
AST::Attribute::List { },
AST::StructureRole::PackedResource,
&structType->structure
);
m_shaderModule.append(m_shaderModule.declarations(), packedStruct);
const Type* packedStructType = m_shaderModule.types().structType(packedStruct);
packedStruct.m_inferredType = packedStructType;
m_packedStructTypes.add(structType, packedStructType);
return packedStructType;
}
const Type* RewriteGlobalVariables::packArrayType(const Types::Array* arrayType)
{
auto* packedElementType = packType(arrayType->element);
if (!packedElementType)
return nullptr;
m_shaderModule.setUsesUnpackArray();
m_shaderModule.setUsesPackArray();
return m_shaderModule.types().arrayType(packedElementType, arrayType->size);
}
static size_t getRoundedSize(const AST::Variable& variable)
{
auto* type = variable.storeType();
return roundUpToMultipleOf(16, type ? type->size() : 0);
}
void RewriteGlobalVariables::insertParameter(const SourceSpan& span, const AST::Function& function, unsigned group, AST::Identifier&& name, AST::Expression* type, AST::ParameterRole parameterRole)
{
if (!type) {
type = &m_shaderModule.astBuilder().construct<AST::IdentifierExpression>(span, argumentBufferStructName(group));
type->m_inferredType = m_structTypes.get(group);
}
auto& groupValue = m_shaderModule.astBuilder().construct<AST::AbstractIntegerLiteral>(span, group);
groupValue.m_inferredType = m_shaderModule.types().abstractIntType();
groupValue.setConstantValue(group);
auto& groupAttribute = m_shaderModule.astBuilder().construct<AST::GroupAttribute>(span, groupValue);
m_shaderModule.append(function.parameters(), m_shaderModule.astBuilder().construct<AST::Parameter>(
span,
WTFMove(name),
*type,
AST::Attribute::List { groupAttribute },
parameterRole
));
};
std::optional<Error> RewriteGlobalVariables::visitEntryPoint(const CallGraph::EntryPoint& entryPoint)
{
dataLogLnIf(shouldLogGlobalVariableRewriting, "> Visiting entrypoint: ", entryPoint.function.name());
auto it = m_pipelineLayouts.find(entryPoint.originalName);
if (it == m_pipelineLayouts.end())
return std::nullopt;
m_reads.clear();
m_structTypes.clear();
m_globalsUsingDynamicOffset.clear();
auto result = m_entryPointInformations.add(entryPoint.originalName, Reflection::EntryPointInformation { });
RELEASE_ASSERT(result.isNewEntry);
m_stage = entryPoint.stage;
m_entryPointInformation = &result.iterator->value;
m_entryPointInformation->originalName = entryPoint.originalName;
m_entryPointInformation->mangledName = entryPoint.function.name();
switch (m_stage) {
case ShaderStage::Compute: {
for (auto& attribute : entryPoint.function.attributes()) {
auto* workgroupSize = dynamicDowncast<AST::WorkgroupSizeAttribute>(attribute);
if (!workgroupSize)
continue;
m_entryPointInformation->typedEntryPoint = Reflection::Compute { &workgroupSize->x(), workgroupSize->maybeY(), workgroupSize->maybeZ() };
break;
}
break;