| /* |
| * Copyright 2016 Google Inc. |
| * |
| * Use of this source code is governed by a BSD-style license that can be |
| * found in the LICENSE file. |
| */ |
| |
| #include "src/sksl/SkSLIRGenerator.h" |
| |
| #include "limits.h" |
| #include <unordered_set> |
| |
| #include "src/sksl/SkSLCompiler.h" |
| #include "src/sksl/SkSLParser.h" |
| #include "src/sksl/ir/SkSLBinaryExpression.h" |
| #include "src/sksl/ir/SkSLBoolLiteral.h" |
| #include "src/sksl/ir/SkSLBreakStatement.h" |
| #include "src/sksl/ir/SkSLConstructor.h" |
| #include "src/sksl/ir/SkSLContinueStatement.h" |
| #include "src/sksl/ir/SkSLDiscardStatement.h" |
| #include "src/sksl/ir/SkSLDoStatement.h" |
| #include "src/sksl/ir/SkSLEnum.h" |
| #include "src/sksl/ir/SkSLExpressionStatement.h" |
| #include "src/sksl/ir/SkSLExternalFunctionCall.h" |
| #include "src/sksl/ir/SkSLExternalValueReference.h" |
| #include "src/sksl/ir/SkSLField.h" |
| #include "src/sksl/ir/SkSLFieldAccess.h" |
| #include "src/sksl/ir/SkSLFloatLiteral.h" |
| #include "src/sksl/ir/SkSLForStatement.h" |
| #include "src/sksl/ir/SkSLFunctionCall.h" |
| #include "src/sksl/ir/SkSLFunctionDeclaration.h" |
| #include "src/sksl/ir/SkSLFunctionDefinition.h" |
| #include "src/sksl/ir/SkSLFunctionReference.h" |
| #include "src/sksl/ir/SkSLIfStatement.h" |
| #include "src/sksl/ir/SkSLIndexExpression.h" |
| #include "src/sksl/ir/SkSLIntLiteral.h" |
| #include "src/sksl/ir/SkSLInterfaceBlock.h" |
| #include "src/sksl/ir/SkSLLayout.h" |
| #include "src/sksl/ir/SkSLNop.h" |
| #include "src/sksl/ir/SkSLNullLiteral.h" |
| #include "src/sksl/ir/SkSLPostfixExpression.h" |
| #include "src/sksl/ir/SkSLPrefixExpression.h" |
| #include "src/sksl/ir/SkSLReturnStatement.h" |
| #include "src/sksl/ir/SkSLSetting.h" |
| #include "src/sksl/ir/SkSLSwitchCase.h" |
| #include "src/sksl/ir/SkSLSwitchStatement.h" |
| #include "src/sksl/ir/SkSLSwizzle.h" |
| #include "src/sksl/ir/SkSLTernaryExpression.h" |
| #include "src/sksl/ir/SkSLUnresolvedFunction.h" |
| #include "src/sksl/ir/SkSLVarDeclarations.h" |
| #include "src/sksl/ir/SkSLVarDeclarationsStatement.h" |
| #include "src/sksl/ir/SkSLVariable.h" |
| #include "src/sksl/ir/SkSLVariableReference.h" |
| #include "src/sksl/ir/SkSLWhileStatement.h" |
| |
| namespace SkSL { |
| |
| class AutoSymbolTable { |
| public: |
| AutoSymbolTable(IRGenerator* ir) |
| : fIR(ir) |
| , fPrevious(fIR->fSymbolTable) { |
| fIR->pushSymbolTable(); |
| } |
| |
| ~AutoSymbolTable() { |
| fIR->popSymbolTable(); |
| SkASSERT(fPrevious == fIR->fSymbolTable); |
| } |
| |
| IRGenerator* fIR; |
| std::shared_ptr<SymbolTable> fPrevious; |
| }; |
| |
| class AutoLoopLevel { |
| public: |
| AutoLoopLevel(IRGenerator* ir) |
| : fIR(ir) { |
| fIR->fLoopLevel++; |
| } |
| |
| ~AutoLoopLevel() { |
| fIR->fLoopLevel--; |
| } |
| |
| IRGenerator* fIR; |
| }; |
| |
| class AutoSwitchLevel { |
| public: |
| AutoSwitchLevel(IRGenerator* ir) |
| : fIR(ir) { |
| fIR->fSwitchLevel++; |
| } |
| |
| ~AutoSwitchLevel() { |
| fIR->fSwitchLevel--; |
| } |
| |
| IRGenerator* fIR; |
| }; |
| |
| IRGenerator::IRGenerator(const Context* context, std::shared_ptr<SymbolTable> symbolTable, |
| ErrorReporter& errorReporter) |
| : fContext(*context) |
| , fCurrentFunction(nullptr) |
| , fRootSymbolTable(symbolTable) |
| , fSymbolTable(symbolTable) |
| , fLoopLevel(0) |
| , fSwitchLevel(0) |
| , fTmpCount(0) |
| , fErrors(errorReporter) {} |
| |
| void IRGenerator::pushSymbolTable() { |
| fSymbolTable.reset(new SymbolTable(std::move(fSymbolTable), &fErrors)); |
| } |
| |
| void IRGenerator::popSymbolTable() { |
| fSymbolTable = fSymbolTable->fParent; |
| } |
| |
| static void fill_caps(const SKSL_CAPS_CLASS& caps, |
| std::unordered_map<String, Program::Settings::Value>* capsMap) { |
| #define CAP(name) \ |
| capsMap->insert(std::make_pair(String(#name), Program::Settings::Value(caps.name()))) |
| CAP(fbFetchSupport); |
| CAP(fbFetchNeedsCustomOutput); |
| CAP(flatInterpolationSupport); |
| CAP(noperspectiveInterpolationSupport); |
| CAP(externalTextureSupport); |
| CAP(mustEnableAdvBlendEqs); |
| CAP(mustEnableSpecificAdvBlendEqs); |
| CAP(mustDeclareFragmentShaderOutput); |
| CAP(mustDoOpBetweenFloorAndAbs); |
| CAP(atan2ImplementedAsAtanYOverX); |
| CAP(canUseAnyFunctionInShader); |
| CAP(floatIs32Bits); |
| CAP(integerSupport); |
| #undef CAP |
| } |
| |
| void IRGenerator::start(const Program::Settings* settings, |
| std::vector<std::unique_ptr<ProgramElement>>* inherited) { |
| if (fStarted) { |
| this->popSymbolTable(); |
| } |
| fSettings = settings; |
| fCapsMap.clear(); |
| if (settings->fCaps) { |
| fill_caps(*settings->fCaps, &fCapsMap); |
| } else { |
| fCapsMap.insert(std::make_pair(String("integerSupport"), |
| Program::Settings::Value(true))); |
| } |
| this->pushSymbolTable(); |
| fInvocations = -1; |
| fInputs.reset(); |
| fSkPerVertex = nullptr; |
| fRTAdjust = nullptr; |
| fRTAdjustInterfaceBlock = nullptr; |
| if (inherited) { |
| for (const auto& e : *inherited) { |
| if (e->fKind == ProgramElement::kInterfaceBlock_Kind) { |
| InterfaceBlock& intf = (InterfaceBlock&) *e; |
| if (intf.fVariable.fName == Compiler::PERVERTEX_NAME) { |
| SkASSERT(!fSkPerVertex); |
| fSkPerVertex = &intf.fVariable; |
| } |
| } |
| } |
| } |
| SkASSERT(fIntrinsics); |
| for (auto& pair : *fIntrinsics) { |
| pair.second.second = false; |
| } |
| } |
| |
| std::unique_ptr<Extension> IRGenerator::convertExtension(int offset, StringFragment name) { |
| return std::unique_ptr<Extension>(new Extension(offset, name)); |
| } |
| |
| void IRGenerator::finish() { |
| this->popSymbolTable(); |
| fSettings = nullptr; |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertStatement(const ASTNode& statement) { |
| switch (statement.fKind) { |
| case ASTNode::Kind::kBlock: |
| return this->convertBlock(statement); |
| case ASTNode::Kind::kVarDeclarations: |
| return this->convertVarDeclarationStatement(statement); |
| case ASTNode::Kind::kIf: |
| return this->convertIf(statement); |
| case ASTNode::Kind::kFor: |
| return this->convertFor(statement); |
| case ASTNode::Kind::kWhile: |
| return this->convertWhile(statement); |
| case ASTNode::Kind::kDo: |
| return this->convertDo(statement); |
| case ASTNode::Kind::kSwitch: |
| return this->convertSwitch(statement); |
| case ASTNode::Kind::kReturn: |
| return this->convertReturn(statement); |
| case ASTNode::Kind::kBreak: |
| return this->convertBreak(statement); |
| case ASTNode::Kind::kContinue: |
| return this->convertContinue(statement); |
| case ASTNode::Kind::kDiscard: |
| return this->convertDiscard(statement); |
| default: |
| // it's an expression |
| std::unique_ptr<Statement> result = this->convertExpressionStatement(statement); |
| if (fRTAdjust && Program::kGeometry_Kind == fKind) { |
| SkASSERT(result->fKind == Statement::kExpression_Kind); |
| Expression& expr = *((ExpressionStatement&) *result).fExpression; |
| if (expr.fKind == Expression::kFunctionCall_Kind) { |
| FunctionCall& fc = (FunctionCall&) expr; |
| if (fc.fFunction.fBuiltin && fc.fFunction.fName == "EmitVertex") { |
| std::vector<std::unique_ptr<Statement>> statements; |
| statements.push_back(getNormalizeSkPositionCode()); |
| statements.push_back(std::move(result)); |
| return std::unique_ptr<Block>(new Block(statement.fOffset, |
| std::move(statements), |
| fSymbolTable)); |
| } |
| } |
| } |
| return result; |
| } |
| } |
| |
| std::unique_ptr<Block> IRGenerator::convertBlock(const ASTNode& block) { |
| SkASSERT(block.fKind == ASTNode::Kind::kBlock); |
| AutoSymbolTable table(this); |
| std::vector<std::unique_ptr<Statement>> statements; |
| for (const auto& child : block) { |
| std::unique_ptr<Statement> statement = this->convertStatement(child); |
| if (!statement) { |
| return nullptr; |
| } |
| statements.push_back(std::move(statement)); |
| } |
| return std::unique_ptr<Block>(new Block(block.fOffset, std::move(statements), fSymbolTable)); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertVarDeclarationStatement(const ASTNode& s) { |
| SkASSERT(s.fKind == ASTNode::Kind::kVarDeclarations); |
| auto decl = this->convertVarDeclarations(s, Variable::kLocal_Storage); |
| if (!decl) { |
| return nullptr; |
| } |
| return std::unique_ptr<Statement>(new VarDeclarationsStatement(std::move(decl))); |
| } |
| |
| std::unique_ptr<VarDeclarations> IRGenerator::convertVarDeclarations(const ASTNode& decls, |
| Variable::Storage storage) { |
| SkASSERT(decls.fKind == ASTNode::Kind::kVarDeclarations); |
| auto iter = decls.begin(); |
| const Modifiers& modifiers = iter++->getModifiers(); |
| const ASTNode& rawType = *(iter++); |
| std::vector<std::unique_ptr<VarDeclaration>> variables; |
| const Type* baseType = this->convertType(rawType); |
| if (!baseType) { |
| return nullptr; |
| } |
| if (fKind != Program::kFragmentProcessor_Kind) { |
| if ((modifiers.fFlags & Modifiers::kIn_Flag) && |
| baseType->kind() == Type::Kind::kMatrix_Kind) { |
| fErrors.error(decls.fOffset, "'in' variables may not have matrix type"); |
| } |
| if (modifiers.fLayout.fWhen.fLength) { |
| fErrors.error(decls.fOffset, "'when' is only permitted within fragment processors"); |
| } |
| if (modifiers.fLayout.fFlags & Layout::kTracked_Flag) { |
| fErrors.error(decls.fOffset, "'tracked' is only permitted within fragment processors"); |
| } |
| if (modifiers.fLayout.fCType != Layout::CType::kDefault) { |
| fErrors.error(decls.fOffset, "'ctype' is only permitted within fragment processors"); |
| } |
| if (modifiers.fLayout.fKey) { |
| fErrors.error(decls.fOffset, "'key' is only permitted within fragment processors"); |
| } |
| } |
| if (modifiers.fLayout.fKey && (modifiers.fFlags & Modifiers::kUniform_Flag)) { |
| fErrors.error(decls.fOffset, "'key' is not permitted on 'uniform' variables"); |
| } |
| for (; iter != decls.end(); ++iter) { |
| const ASTNode& varDecl = *iter; |
| if (modifiers.fLayout.fLocation == 0 && modifiers.fLayout.fIndex == 0 && |
| (modifiers.fFlags & Modifiers::kOut_Flag) && fKind == Program::kFragment_Kind && |
| varDecl.getVarData().fName != "sk_FragColor") { |
| fErrors.error(varDecl.fOffset, |
| "out location=0, index=0 is reserved for sk_FragColor"); |
| } |
| const ASTNode::VarData& varData = varDecl.getVarData(); |
| const Type* type = baseType; |
| std::vector<std::unique_ptr<Expression>> sizes; |
| auto iter = varDecl.begin(); |
| for (size_t i = 0; i < varData.fSizeCount; ++i, ++iter) { |
| const ASTNode& rawSize = *iter; |
| if (rawSize) { |
| auto size = this->coerce(this->convertExpression(rawSize), *fContext.fInt_Type); |
| if (!size) { |
| return nullptr; |
| } |
| String name(type->fName); |
| int64_t count; |
| if (size->fKind == Expression::kIntLiteral_Kind) { |
| count = ((IntLiteral&) *size).fValue; |
| if (count <= 0) { |
| fErrors.error(size->fOffset, "array size must be positive"); |
| return nullptr; |
| } |
| name += "[" + to_string(count) + "]"; |
| } else { |
| fErrors.error(size->fOffset, "array size must be specified"); |
| return nullptr; |
| } |
| type = (Type*) fSymbolTable->takeOwnership( |
| std::unique_ptr<Symbol>(new Type(name, |
| Type::kArray_Kind, |
| *type, |
| (int) count))); |
| sizes.push_back(std::move(size)); |
| } else { |
| type = (Type*) fSymbolTable->takeOwnership( |
| std::unique_ptr<Symbol>(new Type(type->name() + "[]", |
| Type::kArray_Kind, |
| *type, |
| -1))); |
| sizes.push_back(nullptr); |
| } |
| } |
| auto var = std::unique_ptr<Variable>(new Variable(varDecl.fOffset, modifiers, |
| varData.fName, *type, storage)); |
| if (var->fName == Compiler::RTADJUST_NAME) { |
| SkASSERT(!fRTAdjust); |
| SkASSERT(var->fType == *fContext.fFloat4_Type); |
| fRTAdjust = var.get(); |
| } |
| std::unique_ptr<Expression> value; |
| if (iter != varDecl.end()) { |
| value = this->convertExpression(*iter); |
| if (!value) { |
| return nullptr; |
| } |
| value = this->coerce(std::move(value), *type); |
| if (!value) { |
| return nullptr; |
| } |
| var->fWriteCount = 1; |
| var->fInitialValue = value.get(); |
| } |
| if (storage == Variable::kGlobal_Storage && var->fName == "sk_FragColor" && |
| (*fSymbolTable)[var->fName]) { |
| // already defined, ignore |
| } else if (storage == Variable::kGlobal_Storage && (*fSymbolTable)[var->fName] && |
| (*fSymbolTable)[var->fName]->fKind == Symbol::kVariable_Kind && |
| ((Variable*) (*fSymbolTable)[var->fName])->fModifiers.fLayout.fBuiltin >= 0) { |
| // already defined, just update the modifiers |
| Variable* old = (Variable*) (*fSymbolTable)[var->fName]; |
| old->fModifiers = var->fModifiers; |
| } else { |
| variables.emplace_back(new VarDeclaration(var.get(), std::move(sizes), |
| std::move(value))); |
| StringFragment name = var->fName; |
| fSymbolTable->add(name, std::move(var)); |
| } |
| } |
| return std::unique_ptr<VarDeclarations>(new VarDeclarations(decls.fOffset, |
| baseType, |
| std::move(variables))); |
| } |
| |
| std::unique_ptr<ModifiersDeclaration> IRGenerator::convertModifiersDeclaration(const ASTNode& m) { |
| SkASSERT(m.fKind == ASTNode::Kind::kModifiers); |
| Modifiers modifiers = m.getModifiers(); |
| if (modifiers.fLayout.fInvocations != -1) { |
| if (fKind != Program::kGeometry_Kind) { |
| fErrors.error(m.fOffset, "'invocations' is only legal in geometry shaders"); |
| return nullptr; |
| } |
| fInvocations = modifiers.fLayout.fInvocations; |
| if (fSettings->fCaps && !fSettings->fCaps->gsInvocationsSupport()) { |
| modifiers.fLayout.fInvocations = -1; |
| Variable* invocationId = (Variable*) (*fSymbolTable)["sk_InvocationID"]; |
| SkASSERT(invocationId); |
| invocationId->fModifiers.fFlags = 0; |
| invocationId->fModifiers.fLayout.fBuiltin = -1; |
| if (modifiers.fLayout.description() == "") { |
| return nullptr; |
| } |
| } |
| } |
| if (modifiers.fLayout.fMaxVertices != -1 && fInvocations > 0 && fSettings->fCaps && |
| !fSettings->fCaps->gsInvocationsSupport()) { |
| modifiers.fLayout.fMaxVertices *= fInvocations; |
| } |
| return std::unique_ptr<ModifiersDeclaration>(new ModifiersDeclaration(modifiers)); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertIf(const ASTNode& n) { |
| SkASSERT(n.fKind == ASTNode::Kind::kIf); |
| auto iter = n.begin(); |
| std::unique_ptr<Expression> test = this->coerce(this->convertExpression(*(iter++)), |
| *fContext.fBool_Type); |
| if (!test) { |
| return nullptr; |
| } |
| std::unique_ptr<Statement> ifTrue = this->convertStatement(*(iter++)); |
| if (!ifTrue) { |
| return nullptr; |
| } |
| std::unique_ptr<Statement> ifFalse; |
| if (iter != n.end()) { |
| ifFalse = this->convertStatement(*(iter++)); |
| if (!ifFalse) { |
| return nullptr; |
| } |
| } |
| if (test->fKind == Expression::kBoolLiteral_Kind) { |
| // static boolean value, fold down to a single branch |
| if (((BoolLiteral&) *test).fValue) { |
| return ifTrue; |
| } else if (ifFalse) { |
| return ifFalse; |
| } else { |
| // False & no else clause. Not an error, so don't return null! |
| std::vector<std::unique_ptr<Statement>> empty; |
| return std::unique_ptr<Statement>(new Block(n.fOffset, std::move(empty), |
| fSymbolTable)); |
| } |
| } |
| return std::unique_ptr<Statement>(new IfStatement(n.fOffset, n.getBool(), std::move(test), |
| std::move(ifTrue), std::move(ifFalse))); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertFor(const ASTNode& f) { |
| SkASSERT(f.fKind == ASTNode::Kind::kFor); |
| AutoLoopLevel level(this); |
| AutoSymbolTable table(this); |
| std::unique_ptr<Statement> initializer; |
| auto iter = f.begin(); |
| if (*iter) { |
| initializer = this->convertStatement(*iter); |
| if (!initializer) { |
| return nullptr; |
| } |
| } |
| ++iter; |
| std::unique_ptr<Expression> test; |
| if (*iter) { |
| test = this->coerce(this->convertExpression(*iter), *fContext.fBool_Type); |
| if (!test) { |
| return nullptr; |
| } |
| } |
| ++iter; |
| std::unique_ptr<Expression> next; |
| if (*iter) { |
| next = this->convertExpression(*iter); |
| if (!next) { |
| return nullptr; |
| } |
| this->checkValid(*next); |
| } |
| ++iter; |
| std::unique_ptr<Statement> statement = this->convertStatement(*iter); |
| if (!statement) { |
| return nullptr; |
| } |
| return std::unique_ptr<Statement>(new ForStatement(f.fOffset, std::move(initializer), |
| std::move(test), std::move(next), |
| std::move(statement), fSymbolTable)); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertWhile(const ASTNode& w) { |
| SkASSERT(w.fKind == ASTNode::Kind::kWhile); |
| AutoLoopLevel level(this); |
| auto iter = w.begin(); |
| std::unique_ptr<Expression> test = this->coerce(this->convertExpression(*(iter++)), |
| *fContext.fBool_Type); |
| if (!test) { |
| return nullptr; |
| } |
| std::unique_ptr<Statement> statement = this->convertStatement(*(iter++)); |
| if (!statement) { |
| return nullptr; |
| } |
| return std::unique_ptr<Statement>(new WhileStatement(w.fOffset, std::move(test), |
| std::move(statement))); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertDo(const ASTNode& d) { |
| SkASSERT(d.fKind == ASTNode::Kind::kDo); |
| AutoLoopLevel level(this); |
| auto iter = d.begin(); |
| std::unique_ptr<Statement> statement = this->convertStatement(*(iter++)); |
| if (!statement) { |
| return nullptr; |
| } |
| std::unique_ptr<Expression> test = this->coerce(this->convertExpression(*(iter++)), |
| *fContext.fBool_Type); |
| if (!test) { |
| return nullptr; |
| } |
| return std::unique_ptr<Statement>(new DoStatement(d.fOffset, std::move(statement), |
| std::move(test))); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertSwitch(const ASTNode& s) { |
| SkASSERT(s.fKind == ASTNode::Kind::kSwitch); |
| AutoSwitchLevel level(this); |
| auto iter = s.begin(); |
| std::unique_ptr<Expression> value = this->convertExpression(*(iter++)); |
| if (!value) { |
| return nullptr; |
| } |
| if (value->fType != *fContext.fUInt_Type && value->fType.kind() != Type::kEnum_Kind) { |
| value = this->coerce(std::move(value), *fContext.fInt_Type); |
| if (!value) { |
| return nullptr; |
| } |
| } |
| AutoSymbolTable table(this); |
| std::unordered_set<int> caseValues; |
| std::vector<std::unique_ptr<SwitchCase>> cases; |
| for (; iter != s.end(); ++iter) { |
| const ASTNode& c = *iter; |
| SkASSERT(c.fKind == ASTNode::Kind::kSwitchCase); |
| std::unique_ptr<Expression> caseValue; |
| auto childIter = c.begin(); |
| if (*childIter) { |
| caseValue = this->convertExpression(*childIter); |
| if (!caseValue) { |
| return nullptr; |
| } |
| caseValue = this->coerce(std::move(caseValue), value->fType); |
| if (!caseValue) { |
| return nullptr; |
| } |
| if (!caseValue->isConstant()) { |
| fErrors.error(caseValue->fOffset, "case value must be a constant"); |
| return nullptr; |
| } |
| int64_t v; |
| this->getConstantInt(*caseValue, &v); |
| if (caseValues.find(v) != caseValues.end()) { |
| fErrors.error(caseValue->fOffset, "duplicate case value"); |
| } |
| caseValues.insert(v); |
| } |
| ++childIter; |
| std::vector<std::unique_ptr<Statement>> statements; |
| for (; childIter != c.end(); ++childIter) { |
| std::unique_ptr<Statement> converted = this->convertStatement(*childIter); |
| if (!converted) { |
| return nullptr; |
| } |
| statements.push_back(std::move(converted)); |
| } |
| cases.emplace_back(new SwitchCase(c.fOffset, std::move(caseValue), |
| std::move(statements))); |
| } |
| return std::unique_ptr<Statement>(new SwitchStatement(s.fOffset, s.getBool(), |
| std::move(value), std::move(cases), |
| fSymbolTable)); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertExpressionStatement(const ASTNode& s) { |
| std::unique_ptr<Expression> e = this->convertExpression(s); |
| if (!e) { |
| return nullptr; |
| } |
| this->checkValid(*e); |
| return std::unique_ptr<Statement>(new ExpressionStatement(std::move(e))); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertReturn(const ASTNode& r) { |
| SkASSERT(r.fKind == ASTNode::Kind::kReturn); |
| SkASSERT(fCurrentFunction); |
| // early returns from a vertex main function will bypass the sk_Position normalization, so |
| // SkASSERT that we aren't doing that. It is of course possible to fix this by adding a |
| // normalization before each return, but it will probably never actually be necessary. |
| SkASSERT(Program::kVertex_Kind != fKind || !fRTAdjust || "main" != fCurrentFunction->fName); |
| if (r.begin() != r.end()) { |
| std::unique_ptr<Expression> result = this->convertExpression(*r.begin()); |
| if (!result) { |
| return nullptr; |
| } |
| if (fCurrentFunction->fReturnType == *fContext.fVoid_Type) { |
| fErrors.error(result->fOffset, "may not return a value from a void function"); |
| } else { |
| result = this->coerce(std::move(result), fCurrentFunction->fReturnType); |
| if (!result) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<Statement>(new ReturnStatement(std::move(result))); |
| } else { |
| if (fCurrentFunction->fReturnType != *fContext.fVoid_Type) { |
| fErrors.error(r.fOffset, "expected function to return '" + |
| fCurrentFunction->fReturnType.description() + "'"); |
| } |
| return std::unique_ptr<Statement>(new ReturnStatement(r.fOffset)); |
| } |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertBreak(const ASTNode& b) { |
| SkASSERT(b.fKind == ASTNode::Kind::kBreak); |
| if (fLoopLevel > 0 || fSwitchLevel > 0) { |
| return std::unique_ptr<Statement>(new BreakStatement(b.fOffset)); |
| } else { |
| fErrors.error(b.fOffset, "break statement must be inside a loop or switch"); |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertContinue(const ASTNode& c) { |
| SkASSERT(c.fKind == ASTNode::Kind::kContinue); |
| if (fLoopLevel > 0) { |
| return std::unique_ptr<Statement>(new ContinueStatement(c.fOffset)); |
| } else { |
| fErrors.error(c.fOffset, "continue statement must be inside a loop"); |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::convertDiscard(const ASTNode& d) { |
| SkASSERT(d.fKind == ASTNode::Kind::kDiscard); |
| return std::unique_ptr<Statement>(new DiscardStatement(d.fOffset)); |
| } |
| |
| std::unique_ptr<Block> IRGenerator::applyInvocationIDWorkaround(std::unique_ptr<Block> main) { |
| Layout invokeLayout; |
| Modifiers invokeModifiers(invokeLayout, Modifiers::kHasSideEffects_Flag); |
| FunctionDeclaration* invokeDecl = new FunctionDeclaration(-1, |
| invokeModifiers, |
| "_invoke", |
| std::vector<const Variable*>(), |
| *fContext.fVoid_Type); |
| fProgramElements->push_back(std::unique_ptr<ProgramElement>( |
| new FunctionDefinition(-1, *invokeDecl, std::move(main)))); |
| fSymbolTable->add(invokeDecl->fName, std::unique_ptr<FunctionDeclaration>(invokeDecl)); |
| |
| std::vector<std::unique_ptr<VarDeclaration>> variables; |
| Variable* loopIdx = (Variable*) (*fSymbolTable)["sk_InvocationID"]; |
| SkASSERT(loopIdx); |
| std::unique_ptr<Expression> test(new BinaryExpression(-1, |
| std::unique_ptr<Expression>(new VariableReference(-1, *loopIdx)), |
| Token::LT, |
| std::unique_ptr<IntLiteral>(new IntLiteral(fContext, -1, fInvocations)), |
| *fContext.fBool_Type)); |
| std::unique_ptr<Expression> next(new PostfixExpression( |
| std::unique_ptr<Expression>( |
| new VariableReference(-1, |
| *loopIdx, |
| VariableReference::kReadWrite_RefKind)), |
| Token::PLUSPLUS)); |
| ASTNode endPrimitiveID(&fFile->fNodes, -1, ASTNode::Kind::kIdentifier, "EndPrimitive"); |
| std::unique_ptr<Expression> endPrimitive = this->convertExpression(endPrimitiveID); |
| SkASSERT(endPrimitive); |
| |
| std::vector<std::unique_ptr<Statement>> loopBody; |
| std::vector<std::unique_ptr<Expression>> invokeArgs; |
| loopBody.push_back(std::unique_ptr<Statement>(new ExpressionStatement( |
| this->call(-1, |
| *invokeDecl, |
| std::vector<std::unique_ptr<Expression>>())))); |
| loopBody.push_back(std::unique_ptr<Statement>(new ExpressionStatement( |
| this->call(-1, |
| std::move(endPrimitive), |
| std::vector<std::unique_ptr<Expression>>())))); |
| std::unique_ptr<Expression> assignment(new BinaryExpression(-1, |
| std::unique_ptr<Expression>(new VariableReference(-1, *loopIdx)), |
| Token::EQ, |
| std::unique_ptr<IntLiteral>(new IntLiteral(fContext, -1, 0)), |
| *fContext.fInt_Type)); |
| std::unique_ptr<Statement> initializer(new ExpressionStatement(std::move(assignment))); |
| std::unique_ptr<Statement> loop = std::unique_ptr<Statement>( |
| new ForStatement(-1, |
| std::move(initializer), |
| std::move(test), |
| std::move(next), |
| std::unique_ptr<Block>(new Block(-1, std::move(loopBody))), |
| fSymbolTable)); |
| std::vector<std::unique_ptr<Statement>> children; |
| children.push_back(std::move(loop)); |
| return std::unique_ptr<Block>(new Block(-1, std::move(children))); |
| } |
| |
| std::unique_ptr<Statement> IRGenerator::getNormalizeSkPositionCode() { |
| // sk_Position = float4(sk_Position.xy * rtAdjust.xz + sk_Position.ww * rtAdjust.yw, |
| // 0, |
| // sk_Position.w); |
| SkASSERT(fSkPerVertex && fRTAdjust); |
| #define REF(var) std::unique_ptr<Expression>(\ |
| new VariableReference(-1, *var, VariableReference::kRead_RefKind)) |
| #define FIELD(var, idx) std::unique_ptr<Expression>(\ |
| new FieldAccess(REF(var), idx, FieldAccess::kAnonymousInterfaceBlock_OwnerKind)) |
| #define POS std::unique_ptr<Expression>(new FieldAccess(REF(fSkPerVertex), 0, \ |
| FieldAccess::kAnonymousInterfaceBlock_OwnerKind)) |
| #define ADJUST (fRTAdjustInterfaceBlock ? \ |
| FIELD(fRTAdjustInterfaceBlock, fRTAdjustFieldIndex) : \ |
| REF(fRTAdjust)) |
| #define SWIZZLE(expr, ...) std::unique_ptr<Expression>(new Swizzle(fContext, expr, \ |
| { __VA_ARGS__ })) |
| #define OP(left, op, right) std::unique_ptr<Expression>( \ |
| new BinaryExpression(-1, left, op, right, \ |
| *fContext.fFloat2_Type)) |
| std::vector<std::unique_ptr<Expression>> children; |
| children.push_back(OP(OP(SWIZZLE(POS, 0, 1), Token::STAR, SWIZZLE(ADJUST, 0, 2)), |
| Token::PLUS, |
| OP(SWIZZLE(POS, 3, 3), Token::STAR, SWIZZLE(ADJUST, 1, 3)))); |
| children.push_back(std::unique_ptr<Expression>(new FloatLiteral(fContext, -1, 0.0))); |
| children.push_back(SWIZZLE(POS, 3)); |
| std::unique_ptr<Expression> result = OP(POS, Token::EQ, |
| std::unique_ptr<Expression>(new Constructor(-1, |
| *fContext.fFloat4_Type, |
| std::move(children)))); |
| return std::unique_ptr<Statement>(new ExpressionStatement(std::move(result))); |
| } |
| |
| void IRGenerator::convertFunction(const ASTNode& f) { |
| auto iter = f.begin(); |
| const Type* returnType = this->convertType(*(iter++)); |
| if (!returnType) { |
| return; |
| } |
| const ASTNode::FunctionData& fd = f.getFunctionData(); |
| std::vector<const Variable*> parameters; |
| for (size_t i = 0; i < fd.fParameterCount; ++i) { |
| const ASTNode& param = *(iter++); |
| SkASSERT(param.fKind == ASTNode::Kind::kParameter); |
| ASTNode::ParameterData pd = param.getParameterData(); |
| auto paramIter = param.begin(); |
| const Type* type = this->convertType(*(paramIter++)); |
| if (!type) { |
| return; |
| } |
| for (int j = (int) pd.fSizeCount; j >= 1; j--) { |
| int size = (param.begin() + j)->getInt(); |
| String name = type->name() + "[" + to_string(size) + "]"; |
| type = (Type*) fSymbolTable->takeOwnership( |
| std::unique_ptr<Symbol>(new Type(std::move(name), |
| Type::kArray_Kind, |
| *type, |
| size))); |
| } |
| StringFragment name = pd.fName; |
| Variable* var = (Variable*) fSymbolTable->takeOwnership( |
| std::unique_ptr<Symbol>(new Variable(param.fOffset, |
| pd.fModifiers, |
| name, |
| *type, |
| Variable::kParameter_Storage))); |
| parameters.push_back(var); |
| } |
| |
| if (fd.fName == "main") { |
| switch (fKind) { |
| case Program::kPipelineStage_Kind: { |
| bool valid; |
| switch (parameters.size()) { |
| case 3: |
| valid = parameters[0]->fType == *fContext.fFloat_Type && |
| parameters[0]->fModifiers.fFlags == 0 && |
| parameters[1]->fType == *fContext.fFloat_Type && |
| parameters[1]->fModifiers.fFlags == 0 && |
| parameters[2]->fType == *fContext.fHalf4_Type && |
| parameters[2]->fModifiers.fFlags == (Modifiers::kIn_Flag | |
| Modifiers::kOut_Flag); |
| break; |
| case 1: |
| valid = parameters[0]->fType == *fContext.fHalf4_Type && |
| parameters[0]->fModifiers.fFlags == (Modifiers::kIn_Flag | |
| Modifiers::kOut_Flag); |
| break; |
| default: |
| valid = false; |
| } |
| if (!valid) { |
| fErrors.error(f.fOffset, "pipeline stage 'main' must be declared main(float, " |
| "float, inout half4) or main(inout half4)"); |
| return; |
| } |
| break; |
| } |
| case Program::kGeneric_Kind: |
| break; |
| default: |
| if (parameters.size()) { |
| fErrors.error(f.fOffset, "shader 'main' must have zero parameters"); |
| } |
| } |
| } |
| |
| // find existing declaration |
| const FunctionDeclaration* decl = nullptr; |
| auto entry = (*fSymbolTable)[fd.fName]; |
| if (entry) { |
| std::vector<const FunctionDeclaration*> functions; |
| switch (entry->fKind) { |
| case Symbol::kUnresolvedFunction_Kind: |
| functions = ((UnresolvedFunction*) entry)->fFunctions; |
| break; |
| case Symbol::kFunctionDeclaration_Kind: |
| functions.push_back((FunctionDeclaration*) entry); |
| break; |
| default: |
| fErrors.error(f.fOffset, "symbol '" + fd.fName + "' was already defined"); |
| return; |
| } |
| for (const auto& other : functions) { |
| SkASSERT(other->fName == fd.fName); |
| if (parameters.size() == other->fParameters.size()) { |
| bool match = true; |
| for (size_t i = 0; i < parameters.size(); i++) { |
| if (parameters[i]->fType != other->fParameters[i]->fType) { |
| match = false; |
| break; |
| } |
| } |
| if (match) { |
| if (*returnType != other->fReturnType) { |
| FunctionDeclaration newDecl(f.fOffset, fd.fModifiers, fd.fName, parameters, |
| *returnType); |
| fErrors.error(f.fOffset, "functions '" + newDecl.description() + |
| "' and '" + other->description() + |
| "' differ only in return type"); |
| return; |
| } |
| decl = other; |
| for (size_t i = 0; i < parameters.size(); i++) { |
| if (parameters[i]->fModifiers != other->fParameters[i]->fModifiers) { |
| fErrors.error(f.fOffset, "modifiers on parameter " + |
| to_string((uint64_t) i + 1) + |
| " differ between declaration and " |
| "definition"); |
| return; |
| } |
| } |
| if (other->fDefined && !other->fBuiltin) { |
| fErrors.error(f.fOffset, "duplicate definition of " + |
| other->description()); |
| } |
| break; |
| } |
| } |
| } |
| } |
| if (!decl) { |
| // couldn't find an existing declaration |
| auto newDecl = std::unique_ptr<FunctionDeclaration>(new FunctionDeclaration(f.fOffset, |
| fd.fModifiers, |
| fd.fName, |
| parameters, |
| *returnType)); |
| decl = newDecl.get(); |
| fSymbolTable->add(decl->fName, std::move(newDecl)); |
| } |
| if (iter != f.end()) { |
| // compile body |
| SkASSERT(!fCurrentFunction); |
| fCurrentFunction = decl; |
| decl->fDefined = true; |
| std::shared_ptr<SymbolTable> old = fSymbolTable; |
| AutoSymbolTable table(this); |
| if (fd.fName == "main" && fKind == Program::kPipelineStage_Kind) { |
| if (parameters.size() == 3) { |
| parameters[0]->fModifiers.fLayout.fBuiltin = SK_MAIN_X_BUILTIN; |
| parameters[1]->fModifiers.fLayout.fBuiltin = SK_MAIN_Y_BUILTIN; |
| parameters[2]->fModifiers.fLayout.fBuiltin = SK_OUTCOLOR_BUILTIN; |
| } else { |
| SkASSERT(parameters.size() == 1); |
| parameters[0]->fModifiers.fLayout.fBuiltin = SK_OUTCOLOR_BUILTIN; |
| } |
| } |
| for (size_t i = 0; i < parameters.size(); i++) { |
| fSymbolTable->addWithoutOwnership(parameters[i]->fName, decl->fParameters[i]); |
| } |
| bool needInvocationIDWorkaround = fInvocations != -1 && fd.fName == "main" && |
| fSettings->fCaps && |
| !fSettings->fCaps->gsInvocationsSupport(); |
| SkASSERT(!fExtraVars.size()); |
| std::unique_ptr<Block> body = this->convertBlock(*iter); |
| for (auto& v : fExtraVars) { |
| body->fStatements.insert(body->fStatements.begin(), std::move(v)); |
| } |
| fExtraVars.clear(); |
| fCurrentFunction = nullptr; |
| if (!body) { |
| return; |
| } |
| if (needInvocationIDWorkaround) { |
| body = this->applyInvocationIDWorkaround(std::move(body)); |
| } |
| // conservatively assume all user-defined functions have side effects |
| ((Modifiers&) decl->fModifiers).fFlags |= Modifiers::kHasSideEffects_Flag; |
| if (Program::kVertex_Kind == fKind && fd.fName == "main" && fRTAdjust) { |
| body->fStatements.insert(body->fStatements.end(), this->getNormalizeSkPositionCode()); |
| } |
| std::unique_ptr<FunctionDefinition> result(new FunctionDefinition(f.fOffset, *decl, |
| std::move(body))); |
| result->fSource = &f; |
| fProgramElements->push_back(std::move(result)); |
| } |
| } |
| |
| std::unique_ptr<InterfaceBlock> IRGenerator::convertInterfaceBlock(const ASTNode& intf) { |
| SkASSERT(intf.fKind == ASTNode::Kind::kInterfaceBlock); |
| ASTNode::InterfaceBlockData id = intf.getInterfaceBlockData(); |
| std::shared_ptr<SymbolTable> old = fSymbolTable; |
| this->pushSymbolTable(); |
| std::shared_ptr<SymbolTable> symbols = fSymbolTable; |
| std::vector<Type::Field> fields; |
| bool haveRuntimeArray = false; |
| bool foundRTAdjust = false; |
| auto iter = intf.begin(); |
| for (size_t i = 0; i < id.fDeclarationCount; ++i) { |
| std::unique_ptr<VarDeclarations> decl = this->convertVarDeclarations( |
| *(iter++), |
| Variable::kInterfaceBlock_Storage); |
| if (!decl) { |
| return nullptr; |
| } |
| for (const auto& stmt : decl->fVars) { |
| VarDeclaration& vd = (VarDeclaration&) *stmt; |
| if (haveRuntimeArray) { |
| fErrors.error(decl->fOffset, |
| "only the last entry in an interface block may be a runtime-sized " |
| "array"); |
| } |
| if (vd.fVar == fRTAdjust) { |
| foundRTAdjust = true; |
| SkASSERT(vd.fVar->fType == *fContext.fFloat4_Type); |
| fRTAdjustFieldIndex = fields.size(); |
| } |
| fields.push_back(Type::Field(vd.fVar->fModifiers, vd.fVar->fName, |
| &vd.fVar->fType)); |
| if (vd.fValue) { |
| fErrors.error(decl->fOffset, |
| "initializers are not permitted on interface block fields"); |
| } |
| if (vd.fVar->fModifiers.fFlags & (Modifiers::kIn_Flag | |
| Modifiers::kOut_Flag | |
| Modifiers::kUniform_Flag | |
| Modifiers::kBuffer_Flag | |
| Modifiers::kConst_Flag)) { |
| fErrors.error(decl->fOffset, |
| "interface block fields may not have storage qualifiers"); |
| } |
| if (vd.fVar->fType.kind() == Type::kArray_Kind && |
| vd.fVar->fType.columns() == -1) { |
| haveRuntimeArray = true; |
| } |
| } |
| } |
| this->popSymbolTable(); |
| Type* type = (Type*) old->takeOwnership(std::unique_ptr<Symbol>(new Type(intf.fOffset, |
| id.fTypeName, |
| fields))); |
| std::vector<std::unique_ptr<Expression>> sizes; |
| for (size_t i = 0; i < id.fSizeCount; ++i) { |
| const ASTNode& size = *(iter++); |
| if (size) { |
| std::unique_ptr<Expression> converted = this->convertExpression(size); |
| if (!converted) { |
| return nullptr; |
| } |
| String name = type->fName; |
| int64_t count; |
| if (converted->fKind == Expression::kIntLiteral_Kind) { |
| count = ((IntLiteral&) *converted).fValue; |
| if (count <= 0) { |
| fErrors.error(converted->fOffset, "array size must be positive"); |
| return nullptr; |
| } |
| name += "[" + to_string(count) + "]"; |
| } else { |
| fErrors.error(intf.fOffset, "array size must be specified"); |
| return nullptr; |
| } |
| type = (Type*) symbols->takeOwnership(std::unique_ptr<Symbol>( |
| new Type(name, |
| Type::kArray_Kind, |
| *type, |
| (int) count))); |
| sizes.push_back(std::move(converted)); |
| } else { |
| fErrors.error(intf.fOffset, "array size must be specified"); |
| return nullptr; |
| } |
| } |
| Variable* var = (Variable*) old->takeOwnership(std::unique_ptr<Symbol>( |
| new Variable(intf.fOffset, |
| id.fModifiers, |
| id.fInstanceName.fLength ? id.fInstanceName : id.fTypeName, |
| *type, |
| Variable::kGlobal_Storage))); |
| if (foundRTAdjust) { |
| fRTAdjustInterfaceBlock = var; |
| } |
| if (id.fInstanceName.fLength) { |
| old->addWithoutOwnership(id.fInstanceName, var); |
| } else { |
| for (size_t i = 0; i < fields.size(); i++) { |
| old->add(fields[i].fName, std::unique_ptr<Field>(new Field(intf.fOffset, *var, |
| (int) i))); |
| } |
| } |
| return std::unique_ptr<InterfaceBlock>(new InterfaceBlock(intf.fOffset, |
| var, |
| id.fTypeName, |
| id.fInstanceName, |
| std::move(sizes), |
| symbols)); |
| } |
| |
| void IRGenerator::getConstantInt(const Expression& value, int64_t* out) { |
| switch (value.fKind) { |
| case Expression::kIntLiteral_Kind: |
| *out = ((const IntLiteral&) value).fValue; |
| break; |
| case Expression::kVariableReference_Kind: { |
| const Variable& var = ((VariableReference&) value).fVariable; |
| if ((var.fModifiers.fFlags & Modifiers::kConst_Flag) && |
| var.fInitialValue) { |
| this->getConstantInt(*var.fInitialValue, out); |
| } |
| break; |
| } |
| default: |
| fErrors.error(value.fOffset, "expected a constant int"); |
| } |
| } |
| |
| void IRGenerator::convertEnum(const ASTNode& e) { |
| SkASSERT(e.fKind == ASTNode::Kind::kEnum); |
| std::vector<Variable*> variables; |
| int64_t currentValue = 0; |
| Layout layout; |
| ASTNode enumType(e.fNodes, e.fOffset, ASTNode::Kind::kType, |
| ASTNode::TypeData(e.getString(), false, false)); |
| const Type* type = this->convertType(enumType); |
| Modifiers modifiers(layout, Modifiers::kConst_Flag); |
| std::shared_ptr<SymbolTable> symbols(new SymbolTable(fSymbolTable, &fErrors)); |
| fSymbolTable = symbols; |
| for (auto iter = e.begin(); iter != e.end(); ++iter) { |
| const ASTNode& child = *iter; |
| SkASSERT(child.fKind == ASTNode::Kind::kEnumCase); |
| std::unique_ptr<Expression> value; |
| if (child.begin() != child.end()) { |
| value = this->convertExpression(*child.begin()); |
| if (!value) { |
| fSymbolTable = symbols->fParent; |
| return; |
| } |
| this->getConstantInt(*value, ¤tValue); |
| } |
| value = std::unique_ptr<Expression>(new IntLiteral(fContext, e.fOffset, currentValue)); |
| ++currentValue; |
| auto var = std::unique_ptr<Variable>(new Variable(e.fOffset, modifiers, child.getString(), |
| *type, Variable::kGlobal_Storage, |
| value.get())); |
| variables.push_back(var.get()); |
| symbols->add(child.getString(), std::move(var)); |
| symbols->takeOwnership(std::move(value)); |
| } |
| fProgramElements->push_back(std::unique_ptr<ProgramElement>(new Enum(e.fOffset, e.getString(), |
| symbols))); |
| fSymbolTable = symbols->fParent; |
| } |
| |
| const Type* IRGenerator::convertType(const ASTNode& type) { |
| ASTNode::TypeData td = type.getTypeData(); |
| const Symbol* result = (*fSymbolTable)[td.fName]; |
| if (result && result->fKind == Symbol::kType_Kind) { |
| if (td.fIsNullable) { |
| if (((Type&) *result) == *fContext.fFragmentProcessor_Type) { |
| if (type.begin() != type.end()) { |
| fErrors.error(type.fOffset, "type '" + td.fName + "' may not be used in " |
| "an array"); |
| } |
| result = fSymbolTable->takeOwnership(std::unique_ptr<Symbol>( |
| new Type(String(result->fName) + "?", |
| Type::kNullable_Kind, |
| (const Type&) *result))); |
| } else { |
| fErrors.error(type.fOffset, "type '" + td.fName + "' may not be nullable"); |
| } |
| } |
| for (const auto& size : type) { |
| String name(result->fName); |
| name += "["; |
| if (size) { |
| name += to_string(size.getInt()); |
| } |
| name += "]"; |
| result = (Type*) fSymbolTable->takeOwnership(std::unique_ptr<Symbol>( |
| new Type(name, |
| Type::kArray_Kind, |
| (const Type&) *result, |
| size ? size.getInt() |
| : 0))); |
| } |
| return (const Type*) result; |
| } |
| fErrors.error(type.fOffset, "unknown type '" + td.fName + "'"); |
| return nullptr; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertExpression(const ASTNode& expr) { |
| switch (expr.fKind) { |
| case ASTNode::Kind::kBinary: |
| return this->convertBinaryExpression(expr); |
| case ASTNode::Kind::kBool: |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, expr.fOffset, |
| expr.getBool())); |
| case ASTNode::Kind::kCall: |
| return this->convertCallExpression(expr); |
| case ASTNode::Kind::kField: |
| return this->convertFieldExpression(expr); |
| case ASTNode::Kind::kFloat: |
| return std::unique_ptr<Expression>(new FloatLiteral(fContext, expr.fOffset, |
| expr.getFloat())); |
| case ASTNode::Kind::kIdentifier: |
| return this->convertIdentifier(expr); |
| case ASTNode::Kind::kIndex: |
| return this->convertIndexExpression(expr); |
| case ASTNode::Kind::kInt: |
| return std::unique_ptr<Expression>(new IntLiteral(fContext, expr.fOffset, |
| expr.getInt())); |
| case ASTNode::Kind::kNull: |
| return std::unique_ptr<Expression>(new NullLiteral(fContext, expr.fOffset)); |
| case ASTNode::Kind::kPostfix: |
| return this->convertPostfixExpression(expr); |
| case ASTNode::Kind::kPrefix: |
| return this->convertPrefixExpression(expr); |
| case ASTNode::Kind::kTernary: |
| return this->convertTernaryExpression(expr); |
| default: |
| ABORT("unsupported expression: %s\n", expr.description().c_str()); |
| } |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertIdentifier(const ASTNode& identifier) { |
| SkASSERT(identifier.fKind == ASTNode::Kind::kIdentifier); |
| const Symbol* result = (*fSymbolTable)[identifier.getString()]; |
| if (!result) { |
| fErrors.error(identifier.fOffset, "unknown identifier '" + identifier.getString() + "'"); |
| return nullptr; |
| } |
| switch (result->fKind) { |
| case Symbol::kFunctionDeclaration_Kind: { |
| std::vector<const FunctionDeclaration*> f = { |
| (const FunctionDeclaration*) result |
| }; |
| return std::unique_ptr<FunctionReference>(new FunctionReference(fContext, |
| identifier.fOffset, |
| f)); |
| } |
| case Symbol::kUnresolvedFunction_Kind: { |
| const UnresolvedFunction* f = (const UnresolvedFunction*) result; |
| return std::unique_ptr<FunctionReference>(new FunctionReference(fContext, |
| identifier.fOffset, |
| f->fFunctions)); |
| } |
| case Symbol::kVariable_Kind: { |
| const Variable* var = (const Variable*) result; |
| switch (var->fModifiers.fLayout.fBuiltin) { |
| case SK_WIDTH_BUILTIN: |
| fInputs.fRTWidth = true; |
| break; |
| case SK_HEIGHT_BUILTIN: |
| fInputs.fRTHeight = true; |
| break; |
| #ifndef SKSL_STANDALONE |
| case SK_FRAGCOORD_BUILTIN: |
| fInputs.fFlipY = true; |
| if (fSettings->fFlipY && |
| (!fSettings->fCaps || |
| !fSettings->fCaps->fragCoordConventionsExtensionString())) { |
| fInputs.fRTHeight = true; |
| } |
| #endif |
| } |
| if (fKind == Program::kFragmentProcessor_Kind && |
| (var->fModifiers.fFlags & Modifiers::kIn_Flag) && |
| !(var->fModifiers.fFlags & Modifiers::kUniform_Flag) && |
| !var->fModifiers.fLayout.fKey && |
| var->fModifiers.fLayout.fBuiltin == -1 && |
| var->fType.nonnullable() != *fContext.fFragmentProcessor_Type && |
| var->fType.kind() != Type::kSampler_Kind) { |
| bool valid = false; |
| for (const auto& decl : fFile->root()) { |
| if (decl.fKind == ASTNode::Kind::kSection) { |
| ASTNode::SectionData section = decl.getSectionData(); |
| if (section.fName == "setData") { |
| valid = true; |
| break; |
| } |
| } |
| } |
| if (!valid) { |
| fErrors.error(identifier.fOffset, "'in' variable must be either 'uniform' or " |
| "'layout(key)', or there must be a custom " |
| "@setData function"); |
| } |
| } |
| // default to kRead_RefKind; this will be corrected later if the variable is written to |
| return std::unique_ptr<VariableReference>(new VariableReference( |
| identifier.fOffset, |
| *var, |
| VariableReference::kRead_RefKind)); |
| } |
| case Symbol::kField_Kind: { |
| const Field* field = (const Field*) result; |
| VariableReference* base = new VariableReference(identifier.fOffset, field->fOwner, |
| VariableReference::kRead_RefKind); |
| return std::unique_ptr<Expression>(new FieldAccess( |
| std::unique_ptr<Expression>(base), |
| field->fFieldIndex, |
| FieldAccess::kAnonymousInterfaceBlock_OwnerKind)); |
| } |
| case Symbol::kType_Kind: { |
| const Type* t = (const Type*) result; |
| return std::unique_ptr<TypeReference>(new TypeReference(fContext, identifier.fOffset, |
| *t)); |
| } |
| case Symbol::kExternal_Kind: { |
| ExternalValue* r = (ExternalValue*) result; |
| return std::unique_ptr<ExternalValueReference>( |
| new ExternalValueReference(identifier.fOffset, r)); |
| } |
| default: |
| ABORT("unsupported symbol type %d\n", result->fKind); |
| } |
| } |
| |
| std::unique_ptr<Section> IRGenerator::convertSection(const ASTNode& s) { |
| ASTNode::SectionData section = s.getSectionData(); |
| return std::unique_ptr<Section>(new Section(s.fOffset, section.fName, section.fArgument, |
| section.fText)); |
| } |
| |
| |
| std::unique_ptr<Expression> IRGenerator::coerce(std::unique_ptr<Expression> expr, |
| const Type& type) { |
| if (!expr) { |
| return nullptr; |
| } |
| if (expr->fType == type) { |
| return expr; |
| } |
| this->checkValid(*expr); |
| if (expr->fType == *fContext.fInvalid_Type) { |
| return nullptr; |
| } |
| if (expr->coercionCost(type) == INT_MAX) { |
| fErrors.error(expr->fOffset, "expected '" + type.description() + "', but found '" + |
| expr->fType.description() + "'"); |
| return nullptr; |
| } |
| if (type.kind() == Type::kScalar_Kind) { |
| std::vector<std::unique_ptr<Expression>> args; |
| args.push_back(std::move(expr)); |
| std::unique_ptr<Expression> ctor; |
| if (type == *fContext.fFloatLiteral_Type) { |
| ctor = this->convertIdentifier(ASTNode(&fFile->fNodes, -1, ASTNode::Kind::kIdentifier, |
| "float")); |
| } else if (type == *fContext.fIntLiteral_Type) { |
| ctor = this->convertIdentifier(ASTNode(&fFile->fNodes, -1, ASTNode::Kind::kIdentifier, |
| "int")); |
| } else { |
| ctor = this->convertIdentifier(ASTNode(&fFile->fNodes, -1, ASTNode::Kind::kIdentifier, |
| type.fName)); |
| } |
| if (!ctor) { |
| printf("error, null identifier: %s\n", String(type.fName).c_str()); |
| } |
| SkASSERT(ctor); |
| return this->call(-1, std::move(ctor), std::move(args)); |
| } |
| if (expr->fKind == Expression::kNullLiteral_Kind) { |
| SkASSERT(type.kind() == Type::kNullable_Kind); |
| return std::unique_ptr<Expression>(new NullLiteral(expr->fOffset, type)); |
| } |
| std::vector<std::unique_ptr<Expression>> args; |
| args.push_back(std::move(expr)); |
| return std::unique_ptr<Expression>(new Constructor(-1, type, std::move(args))); |
| } |
| |
| static bool is_matrix_multiply(const Type& left, const Type& right) { |
| if (left.kind() == Type::kMatrix_Kind) { |
| return right.kind() == Type::kMatrix_Kind || right.kind() == Type::kVector_Kind; |
| } |
| return left.kind() == Type::kVector_Kind && right.kind() == Type::kMatrix_Kind; |
| } |
| |
| /** |
| * Determines the operand and result types of a binary expression. Returns true if the expression is |
| * legal, false otherwise. If false, the values of the out parameters are undefined. |
| */ |
| static bool determine_binary_type(const Context& context, |
| Token::Kind op, |
| const Type& left, |
| const Type& right, |
| const Type** outLeftType, |
| const Type** outRightType, |
| const Type** outResultType, |
| bool tryFlipped) { |
| bool isLogical; |
| bool validMatrixOrVectorOp; |
| switch (op) { |
| case Token::EQ: |
| *outLeftType = &left; |
| *outRightType = &left; |
| *outResultType = &left; |
| return right.canCoerceTo(left); |
| case Token::EQEQ: // fall through |
| case Token::NEQ: |
| if (right.canCoerceTo(left)) { |
| *outLeftType = &left; |
| *outRightType = &left; |
| *outResultType = context.fBool_Type.get(); |
| return true; |
| } if (left.canCoerceTo(right)) { |
| *outLeftType = &right; |
| *outRightType = &right; |
| *outResultType = context.fBool_Type.get(); |
| return true; |
| } |
| return false; |
| case Token::LT: // fall through |
| case Token::GT: // fall through |
| case Token::LTEQ: // fall through |
| case Token::GTEQ: |
| isLogical = true; |
| validMatrixOrVectorOp = false; |
| break; |
| case Token::LOGICALOR: // fall through |
| case Token::LOGICALAND: // fall through |
| case Token::LOGICALXOR: // fall through |
| case Token::LOGICALOREQ: // fall through |
| case Token::LOGICALANDEQ: // fall through |
| case Token::LOGICALXOREQ: |
| *outLeftType = context.fBool_Type.get(); |
| *outRightType = context.fBool_Type.get(); |
| *outResultType = context.fBool_Type.get(); |
| return left.canCoerceTo(*context.fBool_Type) && |
| right.canCoerceTo(*context.fBool_Type); |
| case Token::STAREQ: |
| if (left.kind() == Type::kScalar_Kind) { |
| *outLeftType = &left; |
| *outRightType = &left; |
| *outResultType = &left; |
| return right.canCoerceTo(left); |
| } |
| // fall through |
| case Token::STAR: |
| if (is_matrix_multiply(left, right)) { |
| // determine final component type |
| if (determine_binary_type(context, Token::STAR, left.componentType(), |
| right.componentType(), outLeftType, outRightType, |
| outResultType, false)) { |
| *outLeftType = &(*outResultType)->toCompound(context, left.columns(), |
| left.rows()); |
| *outRightType = &(*outResultType)->toCompound(context, right.columns(), |
| right.rows()); |
| int leftColumns = left.columns(); |
| int leftRows = left.rows(); |
| int rightColumns; |
| int rightRows; |
| if (right.kind() == Type::kVector_Kind) { |
| // matrix * vector treats the vector as a column vector, so we need to |
| // transpose it |
| rightColumns = right.rows(); |
| rightRows = right.columns(); |
| SkASSERT(rightColumns == 1); |
| } else { |
| rightColumns = right.columns(); |
| rightRows = right.rows(); |
| } |
| if (rightColumns > 1) { |
| *outResultType = &(*outResultType)->toCompound(context, rightColumns, |
| leftRows); |
| } else { |
| // result was a column vector, transpose it back to a row |
| *outResultType = &(*outResultType)->toCompound(context, leftRows, |
| rightColumns); |
| } |
| return leftColumns == rightRows; |
| } else { |
| return false; |
| } |
| } |
| isLogical = false; |
| validMatrixOrVectorOp = true; |
| break; |
| case Token::PLUSEQ: |
| case Token::MINUSEQ: |
| case Token::SLASHEQ: |
| case Token::PERCENTEQ: |
| case Token::SHLEQ: |
| case Token::SHREQ: |
| if (left.kind() == Type::kScalar_Kind) { |
| *outLeftType = &left; |
| *outRightType = &left; |
| *outResultType = &left; |
| return right.canCoerceTo(left); |
| } |
| // fall through |
| case Token::PLUS: // fall through |
| case Token::MINUS: // fall through |
| case Token::SLASH: // fall through |
| isLogical = false; |
| validMatrixOrVectorOp = true; |
| break; |
| case Token::COMMA: |
| *outLeftType = &left; |
| *outRightType = &right; |
| *outResultType = &right; |
| return true; |
| default: |
| isLogical = false; |
| validMatrixOrVectorOp = false; |
| } |
| bool isVectorOrMatrix = left.kind() == Type::kVector_Kind || left.kind() == Type::kMatrix_Kind; |
| if (left.kind() == Type::kScalar_Kind && right.kind() == Type::kScalar_Kind && |
| right.canCoerceTo(left)) { |
| if (left.priority() > right.priority()) { |
| *outLeftType = &left; |
| *outRightType = &left; |
| } else { |
| *outLeftType = &right; |
| *outRightType = &right; |
| } |
| if (isLogical) { |
| *outResultType = context.fBool_Type.get(); |
| } else { |
| *outResultType = &left; |
| } |
| return true; |
| } |
| if (right.canCoerceTo(left) && isVectorOrMatrix && validMatrixOrVectorOp) { |
| *outLeftType = &left; |
| *outRightType = &left; |
| if (isLogical) { |
| *outResultType = context.fBool_Type.get(); |
| } else { |
| *outResultType = &left; |
| } |
| return true; |
| } |
| if ((left.kind() == Type::kVector_Kind || left.kind() == Type::kMatrix_Kind) && |
| (right.kind() == Type::kScalar_Kind)) { |
| if (determine_binary_type(context, op, left.componentType(), right, outLeftType, |
| outRightType, outResultType, false)) { |
| *outLeftType = &(*outLeftType)->toCompound(context, left.columns(), left.rows()); |
| if (!isLogical) { |
| *outResultType = &(*outResultType)->toCompound(context, left.columns(), |
| left.rows()); |
| } |
| return true; |
| } |
| return false; |
| } |
| if (tryFlipped) { |
| return determine_binary_type(context, op, right, left, outRightType, outLeftType, |
| outResultType, false); |
| } |
| return false; |
| } |
| |
| static std::unique_ptr<Expression> short_circuit_boolean(const Context& context, |
| const Expression& left, |
| Token::Kind op, |
| const Expression& right) { |
| SkASSERT(left.fKind == Expression::kBoolLiteral_Kind); |
| bool leftVal = ((BoolLiteral&) left).fValue; |
| if (op == Token::LOGICALAND) { |
| // (true && expr) -> (expr) and (false && expr) -> (false) |
| return leftVal ? right.clone() |
| : std::unique_ptr<Expression>(new BoolLiteral(context, left.fOffset, false)); |
| } else if (op == Token::LOGICALOR) { |
| // (true || expr) -> (true) and (false || expr) -> (expr) |
| return leftVal ? std::unique_ptr<Expression>(new BoolLiteral(context, left.fOffset, true)) |
| : right.clone(); |
| } else { |
| // Can't short circuit XOR |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::constantFold(const Expression& left, |
| Token::Kind op, |
| const Expression& right) const { |
| // If the left side is a constant boolean literal, the right side does not need to be constant |
| // for short circuit optimizations to allow the constant to be folded. |
| if (left.fKind == Expression::kBoolLiteral_Kind && !right.isConstant()) { |
| return short_circuit_boolean(fContext, left, op, right); |
| } else if (right.fKind == Expression::kBoolLiteral_Kind && !left.isConstant()) { |
| // There aren't side effects in SKSL within expressions, so (left OP right) is equivalent to |
| // (right OP left) for short-circuit optimizations |
| return short_circuit_boolean(fContext, right, op, left); |
| } |
| |
| // Other than the short-circuit cases above, constant folding requires both sides to be constant |
| if (!left.isConstant() || !right.isConstant()) { |
| return nullptr; |
| } |
| // Note that we expressly do not worry about precision and overflow here -- we use the maximum |
| // precision to calculate the results and hope the result makes sense. The plan is to move the |
| // Skia caps into SkSL, so we have access to all of them including the precisions of the various |
| // types, which will let us be more intelligent about this. |
| if (left.fKind == Expression::kBoolLiteral_Kind && |
| right.fKind == Expression::kBoolLiteral_Kind) { |
| bool leftVal = ((BoolLiteral&) left).fValue; |
| bool rightVal = ((BoolLiteral&) right).fValue; |
| bool result; |
| switch (op) { |
| case Token::LOGICALAND: result = leftVal && rightVal; break; |
| case Token::LOGICALOR: result = leftVal || rightVal; break; |
| case Token::LOGICALXOR: result = leftVal ^ rightVal; break; |
| default: return nullptr; |
| } |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, left.fOffset, result)); |
| } |
| #define RESULT(t, op) std::unique_ptr<Expression>(new t ## Literal(fContext, left.fOffset, \ |
| leftVal op rightVal)) |
| if (left.fKind == Expression::kIntLiteral_Kind && right.fKind == Expression::kIntLiteral_Kind) { |
| int64_t leftVal = ((IntLiteral&) left).fValue; |
| int64_t rightVal = ((IntLiteral&) right).fValue; |
| switch (op) { |
| case Token::PLUS: return RESULT(Int, +); |
| case Token::MINUS: return RESULT(Int, -); |
| case Token::STAR: return RESULT(Int, *); |
| case Token::SLASH: |
| if (rightVal) { |
| return RESULT(Int, /); |
| } |
| fErrors.error(right.fOffset, "division by zero"); |
| return nullptr; |
| case Token::PERCENT: |
| if (rightVal) { |
| return RESULT(Int, %); |
| } |
| fErrors.error(right.fOffset, "division by zero"); |
| return nullptr; |
| case Token::BITWISEAND: return RESULT(Int, &); |
| case Token::BITWISEOR: return RESULT(Int, |); |
| case Token::BITWISEXOR: return RESULT(Int, ^); |
| case Token::EQEQ: return RESULT(Bool, ==); |
| case Token::NEQ: return RESULT(Bool, !=); |
| case Token::GT: return RESULT(Bool, >); |
| case Token::GTEQ: return RESULT(Bool, >=); |
| case Token::LT: return RESULT(Bool, <); |
| case Token::LTEQ: return RESULT(Bool, <=); |
| case Token::SHL: |
| if (rightVal >= 0 && rightVal <= 31) { |
| return RESULT(Int, <<); |
| } |
| fErrors.error(right.fOffset, "shift value out of range"); |
| return nullptr; |
| case Token::SHR: |
| if (rightVal >= 0 && rightVal <= 31) { |
| return RESULT(Int, >>); |
| } |
| fErrors.error(right.fOffset, "shift value out of range"); |
| return nullptr; |
| |
| default: |
| return nullptr; |
| } |
| } |
| if (left.fKind == Expression::kFloatLiteral_Kind && |
| right.fKind == Expression::kFloatLiteral_Kind) { |
| double leftVal = ((FloatLiteral&) left).fValue; |
| double rightVal = ((FloatLiteral&) right).fValue; |
| switch (op) { |
| case Token::PLUS: return RESULT(Float, +); |
| case Token::MINUS: return RESULT(Float, -); |
| case Token::STAR: return RESULT(Float, *); |
| case Token::SLASH: |
| if (rightVal) { |
| return RESULT(Float, /); |
| } |
| fErrors.error(right.fOffset, "division by zero"); |
| return nullptr; |
| case Token::EQEQ: return RESULT(Bool, ==); |
| case Token::NEQ: return RESULT(Bool, !=); |
| case Token::GT: return RESULT(Bool, >); |
| case Token::GTEQ: return RESULT(Bool, >=); |
| case Token::LT: return RESULT(Bool, <); |
| case Token::LTEQ: return RESULT(Bool, <=); |
| default: return nullptr; |
| } |
| } |
| if (left.fType.kind() == Type::kVector_Kind && left.fType.componentType().isFloat() && |
| left.fType == right.fType) { |
| std::vector<std::unique_ptr<Expression>> args; |
| #define RETURN_VEC_COMPONENTWISE_RESULT(op) \ |
| for (int i = 0; i < left.fType.columns(); i++) { \ |
| float value = left.getFVecComponent(i) op \ |
| right.getFVecComponent(i); \ |
| args.emplace_back(new FloatLiteral(fContext, -1, value)); \ |
| } \ |
| return std::unique_ptr<Expression>(new Constructor(-1, left.fType, \ |
| std::move(args))) |
| switch (op) { |
| case Token::EQEQ: |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, -1, |
| left.compareConstant(fContext, right))); |
| case Token::NEQ: |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, -1, |
| !left.compareConstant(fContext, right))); |
| case Token::PLUS: RETURN_VEC_COMPONENTWISE_RESULT(+); |
| case Token::MINUS: RETURN_VEC_COMPONENTWISE_RESULT(-); |
| case Token::STAR: RETURN_VEC_COMPONENTWISE_RESULT(*); |
| case Token::SLASH: |
| for (int i = 0; i < left.fType.columns(); i++) { |
| SKSL_FLOAT rvalue = right.getFVecComponent(i); |
| if (rvalue == 0.0) { |
| fErrors.error(right.fOffset, "division by zero"); |
| return nullptr; |
| } |
| float value = left.getFVecComponent(i) / rvalue; |
| args.emplace_back(new FloatLiteral(fContext, -1, value)); |
| } |
| return std::unique_ptr<Expression>(new Constructor(-1, left.fType, |
| std::move(args))); |
| default: return nullptr; |
| } |
| } |
| if (left.fType.kind() == Type::kMatrix_Kind && |
| right.fType.kind() == Type::kMatrix_Kind && |
| left.fKind == right.fKind) { |
| switch (op) { |
| case Token::EQEQ: |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, -1, |
| left.compareConstant(fContext, right))); |
| case Token::NEQ: |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, -1, |
| !left.compareConstant(fContext, right))); |
| default: |
| return nullptr; |
| } |
| } |
| #undef RESULT |
| return nullptr; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertBinaryExpression(const ASTNode& expression) { |
| SkASSERT(expression.fKind == ASTNode::Kind::kBinary); |
| auto iter = expression.begin(); |
| std::unique_ptr<Expression> left = this->convertExpression(*(iter++)); |
| if (!left) { |
| return nullptr; |
| } |
| std::unique_ptr<Expression> right = this->convertExpression(*(iter++)); |
| if (!right) { |
| return nullptr; |
| } |
| const Type* leftType; |
| const Type* rightType; |
| const Type* resultType; |
| const Type* rawLeftType; |
| if (left->fKind == Expression::kIntLiteral_Kind && right->fType.isInteger()) { |
| rawLeftType = &right->fType; |
| } else { |
| rawLeftType = &left->fType; |
| } |
| const Type* rawRightType; |
| if (right->fKind == Expression::kIntLiteral_Kind && left->fType.isInteger()) { |
| rawRightType = &left->fType; |
| } else { |
| rawRightType = &right->fType; |
| } |
| Token::Kind op = expression.getToken().fKind; |
| if (!determine_binary_type(fContext, op, *rawLeftType, *rawRightType, &leftType, &rightType, |
| &resultType, !Compiler::IsAssignment(op))) { |
| fErrors.error(expression.fOffset, String("type mismatch: '") + |
| Compiler::OperatorName(expression.getToken().fKind) + |
| "' cannot operate on '" + left->fType.description() + |
| "', '" + right->fType.description() + "'"); |
| return nullptr; |
| } |
| if (Compiler::IsAssignment(op)) { |
| this->setRefKind(*left, op != Token::EQ ? VariableReference::kReadWrite_RefKind : |
| VariableReference::kWrite_RefKind); |
| } |
| left = this->coerce(std::move(left), *leftType); |
| right = this->coerce(std::move(right), *rightType); |
| if (!left || !right) { |
| return nullptr; |
| } |
| std::unique_ptr<Expression> result = this->constantFold(*left.get(), op, *right.get()); |
| if (!result) { |
| result = std::unique_ptr<Expression>(new BinaryExpression(expression.fOffset, |
| std::move(left), |
| op, |
| std::move(right), |
| *resultType)); |
| } |
| return result; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertTernaryExpression(const ASTNode& node) { |
| SkASSERT(node.fKind == ASTNode::Kind::kTernary); |
| auto iter = node.begin(); |
| std::unique_ptr<Expression> test = this->coerce(this->convertExpression(*(iter++)), |
| *fContext.fBool_Type); |
| if (!test) { |
| return nullptr; |
| } |
| std::unique_ptr<Expression> ifTrue = this->convertExpression(*(iter++)); |
| if (!ifTrue) { |
| return nullptr; |
| } |
| std::unique_ptr<Expression> ifFalse = this->convertExpression(*(iter++)); |
| if (!ifFalse) { |
| return nullptr; |
| } |
| const Type* trueType; |
| const Type* falseType; |
| const Type* resultType; |
| if (!determine_binary_type(fContext, Token::EQEQ, ifTrue->fType, ifFalse->fType, &trueType, |
| &falseType, &resultType, true) || trueType != falseType) { |
| fErrors.error(node.fOffset, "ternary operator result mismatch: '" + |
| ifTrue->fType.description() + "', '" + |
| ifFalse->fType.description() + "'"); |
| return nullptr; |
| } |
| ifTrue = this->coerce(std::move(ifTrue), *trueType); |
| if (!ifTrue) { |
| return nullptr; |
| } |
| ifFalse = this->coerce(std::move(ifFalse), *falseType); |
| if (!ifFalse) { |
| return nullptr; |
| } |
| if (test->fKind == Expression::kBoolLiteral_Kind) { |
| // static boolean test, just return one of the branches |
| if (((BoolLiteral&) *test).fValue) { |
| return ifTrue; |
| } else { |
| return ifFalse; |
| } |
| } |
| return std::unique_ptr<Expression>(new TernaryExpression(node.fOffset, |
| std::move(test), |
| std::move(ifTrue), |
| std::move(ifFalse))); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::call(int offset, |
| const FunctionDeclaration& function, |
| std::vector<std::unique_ptr<Expression>> arguments) { |
| if (function.fBuiltin) { |
| auto found = fIntrinsics->find(function.fName); |
| if (found != fIntrinsics->end() && !found->second.second) { |
| found->second.second = true; |
| const FunctionDeclaration* old = fCurrentFunction; |
| fCurrentFunction = nullptr; |
| this->convertFunction(*((FunctionDefinition&) *found->second.first).fSource); |
| fCurrentFunction = old; |
| } |
| } |
| if (function.fParameters.size() != arguments.size()) { |
| String msg = "call to '" + function.fName + "' expected " + |
| to_string((uint64_t) function.fParameters.size()) + |
| " argument"; |
| if (function.fParameters.size() != 1) { |
| msg += "s"; |
| } |
| msg += ", but found " + to_string((uint64_t) arguments.size()); |
| fErrors.error(offset, msg); |
| return nullptr; |
| } |
| std::vector<const Type*> types; |
| const Type* returnType; |
| if (!function.determineFinalTypes(arguments, &types, &returnType)) { |
| String msg = "no match for " + function.fName + "("; |
| String separator; |
| for (size_t i = 0; i < arguments.size(); i++) { |
| msg += separator; |
| separator = ", "; |
| msg += arguments[i]->fType.description(); |
| } |
| msg += ")"; |
| fErrors.error(offset, msg); |
| return nullptr; |
| } |
| for (size_t i = 0; i < arguments.size(); i++) { |
| arguments[i] = this->coerce(std::move(arguments[i]), *types[i]); |
| if (!arguments[i]) { |
| return nullptr; |
| } |
| if (arguments[i] && (function.fParameters[i]->fModifiers.fFlags & Modifiers::kOut_Flag)) { |
| this->setRefKind(*arguments[i], |
| function.fParameters[i]->fModifiers.fFlags & Modifiers::kIn_Flag ? |
| VariableReference::kReadWrite_RefKind : |
| VariableReference::kPointer_RefKind); |
| } |
| } |
| return std::unique_ptr<FunctionCall>(new FunctionCall(offset, *returnType, function, |
| std::move(arguments))); |
| } |
| |
| /** |
| * Determines the cost of coercing the arguments of a function to the required types. Cost has no |
| * particular meaning other than "lower costs are preferred". Returns INT_MAX if the call is not |
| * valid. |
| */ |
| int IRGenerator::callCost(const FunctionDeclaration& function, |
| const std::vector<std::unique_ptr<Expression>>& arguments) { |
| if (function.fParameters.size() != arguments.size()) { |
| return INT_MAX; |
| } |
| int total = 0; |
| std::vector<const Type*> types; |
| const Type* ignored; |
| if (!function.determineFinalTypes(arguments, &types, &ignored)) { |
| return INT_MAX; |
| } |
| for (size_t i = 0; i < arguments.size(); i++) { |
| int cost = arguments[i]->coercionCost(*types[i]); |
| if (cost != INT_MAX) { |
| total += cost; |
| } else { |
| return INT_MAX; |
| } |
| } |
| return total; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::call(int offset, |
| std::unique_ptr<Expression> functionValue, |
| std::vector<std::unique_ptr<Expression>> arguments) { |
| switch (functionValue->fKind) { |
| case Expression::kTypeReference_Kind: |
| return this->convertConstructor(offset, |
| ((TypeReference&) *functionValue).fValue, |
| std::move(arguments)); |
| case Expression::kExternalValue_Kind: { |
| ExternalValue* v = ((ExternalValueReference&) *functionValue).fValue; |
| if (!v->canCall()) { |
| fErrors.error(offset, "this external value is not a function"); |
| return nullptr; |
| } |
| int count = v->callParameterCount(); |
| if (count != (int) arguments.size()) { |
| fErrors.error(offset, "external function expected " + to_string(count) + |
| " arguments, but found " + to_string((int) arguments.size())); |
| return nullptr; |
| } |
| static constexpr int PARAMETER_MAX = 16; |
| SkASSERT(count < PARAMETER_MAX); |
| const Type* types[PARAMETER_MAX]; |
| v->getCallParameterTypes(types); |
| for (int i = 0; i < count; ++i) { |
| arguments[i] = this->coerce(std::move(arguments[i]), *types[i]); |
| if (!arguments[i]) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<Expression>(new ExternalFunctionCall(offset, v->callReturnType(), |
| v, std::move(arguments))); |
| } |
| case Expression::kFunctionReference_Kind: { |
| FunctionReference* ref = (FunctionReference*) functionValue.get(); |
| int bestCost = INT_MAX; |
| const FunctionDeclaration* best = nullptr; |
| if (ref->fFunctions.size() > 1) { |
| for (const auto& f : ref->fFunctions) { |
| int cost = this->callCost(*f, arguments); |
| if (cost < bestCost) { |
| bestCost = cost; |
| best = f; |
| } |
| } |
| if (best) { |
| return this->call(offset, *best, std::move(arguments)); |
| } |
| String msg = "no match for " + ref->fFunctions[0]->fName + "("; |
| String separator; |
| for (size_t i = 0; i < arguments.size(); i++) { |
| msg += separator; |
| separator = ", "; |
| msg += arguments[i]->fType.description(); |
| } |
| msg += ")"; |
| fErrors.error(offset, msg); |
| return nullptr; |
| } |
| return this->call(offset, *ref->fFunctions[0], std::move(arguments)); |
| } |
| default: |
| fErrors.error(offset, "'" + functionValue->description() + "' is not a function"); |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertNumberConstructor( |
| int offset, |
| const Type& type, |
| std::vector<std::unique_ptr<Expression>> args) { |
| SkASSERT(type.isNumber()); |
| if (args.size() != 1) { |
| fErrors.error(offset, "invalid arguments to '" + type.description() + |
| "' constructor, (expected exactly 1 argument, but found " + |
| to_string((uint64_t) args.size()) + ")"); |
| return nullptr; |
| } |
| if (type == args[0]->fType) { |
| return std::move(args[0]); |
| } |
| if (type.isFloat() && args.size() == 1 && args[0]->fKind == Expression::kFloatLiteral_Kind) { |
| double value = ((FloatLiteral&) *args[0]).fValue; |
| return std::unique_ptr<Expression>(new FloatLiteral(offset, value, &type)); |
| } |
| if (type.isFloat() && args.size() == 1 && args[0]->fKind == Expression::kIntLiteral_Kind) { |
| int64_t value = ((IntLiteral&) *args[0]).fValue; |
| return std::unique_ptr<Expression>(new FloatLiteral(offset, (double) value, &type)); |
| } |
| if (args[0]->fKind == Expression::kIntLiteral_Kind && (type == *fContext.fInt_Type || |
| type == *fContext.fUInt_Type)) { |
| return std::unique_ptr<Expression>(new IntLiteral(offset, |
| ((IntLiteral&) *args[0]).fValue, |
| &type)); |
| } |
| if (args[0]->fType == *fContext.fBool_Type) { |
| std::unique_ptr<IntLiteral> zero(new IntLiteral(fContext, offset, 0)); |
| std::unique_ptr<IntLiteral> one(new IntLiteral(fContext, offset, 1)); |
| return std::unique_ptr<Expression>( |
| new TernaryExpression(offset, std::move(args[0]), |
| this->coerce(std::move(one), type), |
| this->coerce(std::move(zero), |
| type))); |
| } |
| if (!args[0]->fType.isNumber()) { |
| fErrors.error(offset, "invalid argument to '" + type.description() + |
| "' constructor (expected a number or bool, but found '" + |
| args[0]->fType.description() + "')"); |
| return nullptr; |
| } |
| return std::unique_ptr<Expression>(new Constructor(offset, type, std::move(args))); |
| } |
| |
| int component_count(const Type& type) { |
| switch (type.kind()) { |
| case Type::kVector_Kind: |
| return type.columns(); |
| case Type::kMatrix_Kind: |
| return type.columns() * type.rows(); |
| default: |
| return 1; |
| } |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertCompoundConstructor( |
| int offset, |
| const Type& type, |
| std::vector<std::unique_ptr<Expression>> args) { |
| SkASSERT(type.kind() == Type::kVector_Kind || type.kind() == Type::kMatrix_Kind); |
| if (type.kind() == Type::kMatrix_Kind && args.size() == 1 && |
| args[0]->fType.kind() == Type::kMatrix_Kind) { |
| // matrix from matrix is always legal |
| return std::unique_ptr<Expression>(new Constructor(offset, type, std::move(args))); |
| } |
| int actual = 0; |
| int expected = type.rows() * type.columns(); |
| if (args.size() != 1 || expected != component_count(args[0]->fType) || |
| type.componentType().isNumber() != args[0]->fType.componentType().isNumber()) { |
| for (size_t i = 0; i < args.size(); i++) { |
| if (args[i]->fType.kind() == Type::kVector_Kind) { |
| if (type.componentType().isNumber() != |
| args[i]->fType.componentType().isNumber()) { |
| fErrors.error(offset, "'" + args[i]->fType.description() + "' is not a valid " |
| "parameter to '" + type.description() + |
| "' constructor"); |
| return nullptr; |
| } |
| actual += args[i]->fType.columns(); |
| } else if (args[i]->fType.kind() == Type::kScalar_Kind) { |
| actual += 1; |
| if (type.kind() != Type::kScalar_Kind) { |
| args[i] = this->coerce(std::move(args[i]), type.componentType()); |
| if (!args[i]) { |
| return nullptr; |
| } |
| } |
| } else { |
| fErrors.error(offset, "'" + args[i]->fType.description() + "' is not a valid " |
| "parameter to '" + type.description() + "' constructor"); |
| return nullptr; |
| } |
| } |
| if (actual != 1 && actual != expected) { |
| fErrors.error(offset, "invalid arguments to '" + type.description() + |
| "' constructor (expected " + to_string(expected) + |
| " scalars, but found " + to_string(actual) + ")"); |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<Expression>(new Constructor(offset, type, std::move(args))); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertConstructor( |
| int offset, |
| const Type& type, |
| std::vector<std::unique_ptr<Expression>> args) { |
| // FIXME: add support for structs |
| Type::Kind kind = type.kind(); |
| if (args.size() == 1 && args[0]->fType == type) { |
| // argument is already the right type, just return it |
| return std::move(args[0]); |
| } |
| if (type.isNumber()) { |
| return this->convertNumberConstructor(offset, type, std::move(args)); |
| } else if (kind == Type::kArray_Kind) { |
| const Type& base = type.componentType(); |
| for (size_t i = 0; i < args.size(); i++) { |
| args[i] = this->coerce(std::move(args[i]), base); |
| if (!args[i]) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<Expression>(new Constructor(offset, type, std::move(args))); |
| } else if (kind == Type::kVector_Kind || kind == Type::kMatrix_Kind) { |
| return this->convertCompoundConstructor(offset, type, std::move(args)); |
| } else { |
| fErrors.error(offset, "cannot construct '" + type.description() + "'"); |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertPrefixExpression(const ASTNode& expression) { |
| SkASSERT(expression.fKind == ASTNode::Kind::kPrefix); |
| std::unique_ptr<Expression> base = this->convertExpression(*expression.begin()); |
| if (!base) { |
| return nullptr; |
| } |
| switch (expression.getToken().fKind) { |
| case Token::PLUS: |
| if (!base->fType.isNumber() && base->fType.kind() != Type::kVector_Kind && |
| base->fType != *fContext.fFloatLiteral_Type) { |
| fErrors.error(expression.fOffset, |
| "'+' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| return base; |
| case Token::MINUS: |
| if (base->fKind == Expression::kIntLiteral_Kind) { |
| return std::unique_ptr<Expression>(new IntLiteral(fContext, base->fOffset, |
| -((IntLiteral&) *base).fValue)); |
| } |
| if (base->fKind == Expression::kFloatLiteral_Kind) { |
| double value = -((FloatLiteral&) *base).fValue; |
| return std::unique_ptr<Expression>(new FloatLiteral(fContext, base->fOffset, |
| value)); |
| } |
| if (!base->fType.isNumber() && base->fType.kind() != Type::kVector_Kind) { |
| fErrors.error(expression.fOffset, |
| "'-' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| return std::unique_ptr<Expression>(new PrefixExpression(Token::MINUS, std::move(base))); |
| case Token::PLUSPLUS: |
| if (!base->fType.isNumber()) { |
| fErrors.error(expression.fOffset, |
| String("'") + Compiler::OperatorName(expression.getToken().fKind) + |
| "' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| this->setRefKind(*base, VariableReference::kReadWrite_RefKind); |
| break; |
| case Token::MINUSMINUS: |
| if (!base->fType.isNumber()) { |
| fErrors.error(expression.fOffset, |
| String("'") + Compiler::OperatorName(expression.getToken().fKind) + |
| "' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| this->setRefKind(*base, VariableReference::kReadWrite_RefKind); |
| break; |
| case Token::LOGICALNOT: |
| if (base->fType != *fContext.fBool_Type) { |
| fErrors.error(expression.fOffset, |
| String("'") + Compiler::OperatorName(expression.getToken().fKind) + |
| "' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| if (base->fKind == Expression::kBoolLiteral_Kind) { |
| return std::unique_ptr<Expression>(new BoolLiteral(fContext, base->fOffset, |
| !((BoolLiteral&) *base).fValue)); |
| } |
| break; |
| case Token::BITWISENOT: |
| if (base->fType != *fContext.fInt_Type && base->fType != *fContext.fUInt_Type) { |
| fErrors.error(expression.fOffset, |
| String("'") + Compiler::OperatorName(expression.getToken().fKind) + |
| "' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| break; |
| default: |
| ABORT("unsupported prefix operator\n"); |
| } |
| return std::unique_ptr<Expression>(new PrefixExpression(expression.getToken().fKind, |
| std::move(base))); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertIndex(std::unique_ptr<Expression> base, |
| const ASTNode& index) { |
| if (base->fKind == Expression::kTypeReference_Kind) { |
| if (index.fKind == ASTNode::Kind::kInt) { |
| const Type& oldType = ((TypeReference&) *base).fValue; |
| SKSL_INT size = index.getInt(); |
| Type* newType = (Type*) fSymbolTable->takeOwnership(std::unique_ptr<Symbol>( |
| new Type(oldType.name() + "[" + to_string(size) + "]", |
| Type::kArray_Kind, oldType, size))); |
| return std::unique_ptr<Expression>(new TypeReference(fContext, base->fOffset, |
| *newType)); |
| |
| } else { |
| fErrors.error(base->fOffset, "array size must be a constant"); |
| return nullptr; |
| } |
| } |
| if (base->fType.kind() != Type::kArray_Kind && base->fType.kind() != Type::kMatrix_Kind && |
| base->fType.kind() != Type::kVector_Kind) { |
| fErrors.error(base->fOffset, "expected array, but found '" + base->fType.description() + |
| "'"); |
| return nullptr; |
| } |
| std::unique_ptr<Expression> converted = this->convertExpression(index); |
| if (!converted) { |
| return nullptr; |
| } |
| if (converted->fType != *fContext.fUInt_Type) { |
| converted = this->coerce(std::move(converted), *fContext.fInt_Type); |
| if (!converted) { |
| return nullptr; |
| } |
| } |
| return std::unique_ptr<Expression>(new IndexExpression(fContext, std::move(base), |
| std::move(converted))); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertField(std::unique_ptr<Expression> base, |
| StringFragment field) { |
| if (base->fKind == Expression::kExternalValue_Kind) { |
| ExternalValue& ev = *((ExternalValueReference&) *base).fValue; |
| ExternalValue* result = ev.getChild(String(field).c_str()); |
| if (!result) { |
| fErrors.error(base->fOffset, "external value does not have a child named '" + field + |
| "'"); |
| return nullptr; |
| } |
| return std::unique_ptr<Expression>(new ExternalValueReference(base->fOffset, result)); |
| } |
| auto fields = base->fType.fields(); |
| for (size_t i = 0; i < fields.size(); i++) { |
| if (fields[i].fName == field) { |
| return std::unique_ptr<Expression>(new FieldAccess(std::move(base), (int) i)); |
| } |
| } |
| fErrors.error(base->fOffset, "type '" + base->fType.description() + "' does not have a " |
| "field named '" + field + ""); |
| return nullptr; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertSwizzle(std::unique_ptr<Expression> base, |
| StringFragment fields) { |
| if (base->fType.kind() != Type::kVector_Kind) { |
| fErrors.error(base->fOffset, "cannot swizzle type '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| std::vector<int> swizzleComponents; |
| for (size_t i = 0; i < fields.fLength; i++) { |
| switch (fields[i]) { |
| case '0': |
| swizzleComponents.push_back(SKSL_SWIZZLE_0); |
| break; |
| case '1': |
| swizzleComponents.push_back(SKSL_SWIZZLE_1); |
| break; |
| case 'x': |
| case 'r': |
| case 's': |
| case 'L': |
| swizzleComponents.push_back(0); |
| break; |
| case 'y': |
| case 'g': |
| case 't': |
| case 'T': |
| if (base->fType.columns() >= 2) { |
| swizzleComponents.push_back(1); |
| break; |
| } |
| // fall through |
| case 'z': |
| case 'b': |
| case 'p': |
| case 'R': |
| if (base->fType.columns() >= 3) { |
| swizzleComponents.push_back(2); |
| break; |
| } |
| // fall through |
| case 'w': |
| case 'a': |
| case 'q': |
| case 'B': |
| if (base->fType.columns() >= 4) { |
| swizzleComponents.push_back(3); |
| break; |
| } |
| // fall through |
| default: |
| fErrors.error(base->fOffset, String::printf("invalid swizzle component '%c'", |
| fields[i])); |
| return nullptr; |
| } |
| } |
| SkASSERT(swizzleComponents.size() > 0); |
| if (swizzleComponents.size() > 4) { |
| fErrors.error(base->fOffset, "too many components in swizzle mask '" + fields + "'"); |
| return nullptr; |
| } |
| return std::unique_ptr<Expression>(new Swizzle(fContext, std::move(base), swizzleComponents)); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::getCap(int offset, String name) { |
| auto found = fCapsMap.find(name); |
| if (found == fCapsMap.end()) { |
| fErrors.error(offset, "unknown capability flag '" + name + "'"); |
| return nullptr; |
| } |
| String fullName = "sk_Caps." + name; |
| return std::unique_ptr<Expression>(new Setting(offset, fullName, |
| found->second.literal(fContext, offset))); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::getArg(int offset, String name) const { |
| auto found = fSettings->fArgs.find(name); |
| if (found == fSettings->fArgs.end()) { |
| return nullptr; |
| } |
| String fullName = "sk_Args." + name; |
| return std::unique_ptr<Expression>(new Setting(offset, |
| fullName, |
| found->second.literal(fContext, offset))); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertTypeField(int offset, const Type& type, |
| StringFragment field) { |
| std::unique_ptr<Expression> result; |
| for (const auto& e : *fProgramElements) { |
| if (e->fKind == ProgramElement::kEnum_Kind && type.name() == ((Enum&) *e).fTypeName) { |
| std::shared_ptr<SymbolTable> old = fSymbolTable; |
| fSymbolTable = ((Enum&) *e).fSymbols; |
| result = convertIdentifier(ASTNode(&fFile->fNodes, offset, ASTNode::Kind::kIdentifier, |
| field)); |
| SkASSERT(result->fKind == Expression::kVariableReference_Kind); |
| const Variable& v = ((VariableReference&) *result).fVariable; |
| SkASSERT(v.fInitialValue); |
| SkASSERT(v.fInitialValue->fKind == Expression::kIntLiteral_Kind); |
| result.reset(new IntLiteral(offset, ((IntLiteral&) *v.fInitialValue).fValue, &type)); |
| fSymbolTable = old; |
| break; |
| } |
| } |
| if (!result) { |
| auto found = fIntrinsics->find(type.fName); |
| if (found != fIntrinsics->end()) { |
| SkASSERT(!found->second.second); |
| found->second.second = true; |
| fProgramElements->push_back(found->second.first->clone()); |
| return this->convertTypeField(offset, type, field); |
| } |
| fErrors.error(offset, "type '" + type.fName + "' does not have a field named '" + field + |
| "'"); |
| } |
| return result; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertIndexExpression(const ASTNode& index) { |
| SkASSERT(index.fKind == ASTNode::Kind::kIndex); |
| auto iter = index.begin(); |
| std::unique_ptr<Expression> base = this->convertExpression(*(iter++)); |
| if (!base) { |
| return nullptr; |
| } |
| if (iter != index.end()) { |
| return this->convertIndex(std::move(base), *(iter++)); |
| } else if (base->fKind == Expression::kTypeReference_Kind) { |
| const Type& oldType = ((TypeReference&) *base).fValue; |
| Type* newType = (Type*) fSymbolTable->takeOwnership(std::unique_ptr<Symbol>( |
| new Type(oldType.name() + "[]", |
| Type::kArray_Kind, |
| oldType, |
| -1))); |
| return std::unique_ptr<Expression>(new TypeReference(fContext, base->fOffset, |
| *newType)); |
| } |
| fErrors.error(index.fOffset, "'[]' must follow a type name"); |
| return nullptr; |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertCallExpression(const ASTNode& callNode) { |
| SkASSERT(callNode.fKind == ASTNode::Kind::kCall); |
| auto iter = callNode.begin(); |
| std::unique_ptr<Expression> base = this->convertExpression(*(iter++)); |
| if (!base) { |
| return nullptr; |
| } |
| std::vector<std::unique_ptr<Expression>> arguments; |
| for (; iter != callNode.end(); ++iter) { |
| std::unique_ptr<Expression> converted = this->convertExpression(*iter); |
| if (!converted) { |
| return nullptr; |
| } |
| arguments.push_back(std::move(converted)); |
| } |
| return this->call(callNode.fOffset, std::move(base), std::move(arguments)); |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertFieldExpression(const ASTNode& fieldNode) { |
| std::unique_ptr<Expression> base = this->convertExpression(*fieldNode.begin()); |
| if (!base) { |
| return nullptr; |
| } |
| StringFragment field = fieldNode.getString(); |
| if (base->fType == *fContext.fSkCaps_Type) { |
| return this->getCap(fieldNode.fOffset, field); |
| } |
| if (base->fType == *fContext.fSkArgs_Type) { |
| return this->getArg(fieldNode.fOffset, field); |
| } |
| if (base->fKind == Expression::kTypeReference_Kind) { |
| return this->convertTypeField(base->fOffset, ((TypeReference&) *base).fValue, |
| field); |
| } |
| if (base->fKind == Expression::kExternalValue_Kind) { |
| return this->convertField(std::move(base), field); |
| } |
| switch (base->fType.kind()) { |
| case Type::kVector_Kind: |
| return this->convertSwizzle(std::move(base), field); |
| case Type::kOther_Kind: |
| case Type::kStruct_Kind: |
| return this->convertField(std::move(base), field); |
| default: |
| fErrors.error(base->fOffset, "cannot swizzle value of type '" + |
| base->fType.description() + "'"); |
| return nullptr; |
| } |
| } |
| |
| std::unique_ptr<Expression> IRGenerator::convertPostfixExpression(const ASTNode& expression) { |
| std::unique_ptr<Expression> base = this->convertExpression(*expression.begin()); |
| if (!base) { |
| return nullptr; |
| } |
| if (!base->fType.isNumber()) { |
| fErrors.error(expression.fOffset, |
| "'" + String(Compiler::OperatorName(expression.getToken().fKind)) + |
| "' cannot operate on '" + base->fType.description() + "'"); |
| return nullptr; |
| } |
| this->setRefKind(*base, VariableReference::kReadWrite_RefKind); |
| return std::unique_ptr<Expression>(new PostfixExpression(std::move(base), |
| expression.getToken().fKind)); |
| } |
| |
| void IRGenerator::checkValid(const Expression& expr) { |
| switch (expr.fKind) { |
| case Expression::kFunctionReference_Kind: |
| fErrors.error(expr.fOffset, "expected '(' to begin function call"); |
| break; |
| case Expression::kTypeReference_Kind: |
| fErrors.error(expr.fOffset, "expected '(' to begin constructor invocation"); |
| break; |
| default: |
| if (expr.fType == *fContext.fInvalid_Type) { |
| fErrors.error(expr.fOffset, "invalid expression"); |
| } |
| } |
| } |
| |
| bool IRGenerator::checkSwizzleWrite(const Swizzle& swizzle) { |
| int bits = 0; |
| for (int idx : swizzle.fComponents) { |
| if (idx < 0) { |
| fErrors.error(swizzle.fOffset, "cannot write to a swizzle mask containing a constant"); |
| return false; |
| } |
| SkASSERT(idx <= 3); |
| int bit = 1 << idx; |
| if (bits & bit) { |
| fErrors.error(swizzle.fOffset, |
| "cannot write to the same swizzle field more than once"); |
| return false; |
| } |
| bits |= bit; |
| } |
| return true; |
| } |
| |
| void IRGenerator::setRefKind(const Expression& expr, VariableReference::RefKind kind) { |
| switch (expr.fKind) { |
| case Expression::kVariableReference_Kind: { |
| const Variable& var = ((VariableReference&) expr).fVariable; |
| if (var.fModifiers.fFlags & (Modifiers::kConst_Flag | Modifiers::kUniform_Flag)) { |
| fErrors.error(expr.fOffset, |
| "cannot modify immutable variable '" + var.fName + "'"); |
| } |
| ((VariableReference&) expr).setRefKind(kind); |
| break; |
| } |
| case Expression::kFieldAccess_Kind: |
| this->setRefKind(*((FieldAccess&) expr).fBase, kind); |
| break; |
| case Expression::kSwizzle_Kind: { |
| const Swizzle& swizzle = (Swizzle&) expr; |
| this->checkSwizzleWrite(swizzle); |
| this->setRefKind(*swizzle.fBase, kind); |
| break; |
| } |
| case Expression::kIndex_Kind: |
| this->setRefKind(*((IndexExpression&) expr).fBase, kind); |
| break; |
| case Expression::kTernary_Kind: { |
| TernaryExpression& t = (TernaryExpression&) expr; |
| this->setRefKind(*t.fIfTrue, kind); |
| this->setRefKind(*t.fIfFalse, kind); |
| break; |
| } |
| case Expression::kExternalValue_Kind: { |
| const ExternalValue& v = *((ExternalValueReference&) expr).fValue; |
| if (!v.canWrite()) { |
| fErrors.error(expr.fOffset, |
| "cannot modify immutable external value '" + v.fName + "'"); |
| } |
| break; |
| } |
| default: |
| fErrors.error(expr.fOffset, "cannot assign to '" + expr.description() + "'"); |
| break; |
| } |
| } |
| |
| void IRGenerator::convertProgram(Program::Kind kind, |
| const char* text, |
| size_t length, |
| SymbolTable& types, |
| std::vector<std::unique_ptr<ProgramElement>>* out) { |
| fKind = kind; |
| fProgramElements = out; |
| Parser parser(text, length, types, fErrors); |
| fFile = parser.file(); |
| if (fErrors.errorCount()) { |
| return; |
| } |
| SkASSERT(fFile); |
| for (const auto& decl : fFile->root()) { |
| switch (decl.fKind) { |
| case ASTNode::Kind::kVarDeclarations: { |
| std::unique_ptr<VarDeclarations> s = this->convertVarDeclarations( |
| decl, |
| Variable::kGlobal_Storage); |
| if (s) { |
| fProgramElements->push_back(std::move(s)); |
| } |
| break; |
| } |
| case ASTNode::Kind::kEnum: { |
| this->convertEnum(decl); |
| break; |
| } |
| case ASTNode::Kind::kFunction: { |
| this->convertFunction(decl); |
| break; |
| } |
| case ASTNode::Kind::kModifiers: { |
| std::unique_ptr<ModifiersDeclaration> f = this->convertModifiersDeclaration(decl); |
| if (f) { |
| fProgramElements->push_back(std::move(f)); |
| } |
| break; |
| } |
| case ASTNode::Kind::kInterfaceBlock: { |
| std::unique_ptr<InterfaceBlock> i = this->convertInterfaceBlock(decl); |
| if (i) { |
| fProgramElements->push_back(std::move(i)); |
| } |
| break; |
| } |
| case ASTNode::Kind::kExtension: { |
| std::unique_ptr<Extension> e = this->convertExtension(decl.fOffset, |
| decl.getString()); |
| if (e) { |
| fProgramElements->push_back(std::move(e)); |
| } |
| break; |
| } |
| case ASTNode::Kind::kSection: { |
| std::unique_ptr<Section> s = this->convertSection(decl); |
| if (s) { |
| fProgramElements->push_back(std::move(s)); |
| } |
| break; |
| } |
| default: |
| ABORT("unsupported declaration: %s\n", decl.description().c_str()); |
| } |
| } |
| } |
| |
| |
| } |