| /* |
| * 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 "SkSLCompiler.h" |
| |
| #include <fstream> |
| #include <streambuf> |
| |
| #include "ast/SkSLASTPrecision.h" |
| #include "SkSLCFGGenerator.h" |
| #include "SkSLIRGenerator.h" |
| #include "SkSLParser.h" |
| #include "SkSLSPIRVCodeGenerator.h" |
| #include "ir/SkSLExpression.h" |
| #include "ir/SkSLIntLiteral.h" |
| #include "ir/SkSLModifiersDeclaration.h" |
| #include "ir/SkSLSymbolTable.h" |
| #include "ir/SkSLUnresolvedFunction.h" |
| #include "ir/SkSLVarDeclarations.h" |
| #include "SkMutex.h" |
| |
| #define STRINGIFY(x) #x |
| |
| // include the built-in shader symbols as static strings |
| |
| static const char* SKSL_INCLUDE = |
| #include "sksl.include" |
| ; |
| |
| static const char* SKSL_VERT_INCLUDE = |
| #include "sksl_vert.include" |
| ; |
| |
| static const char* SKSL_FRAG_INCLUDE = |
| #include "sksl_frag.include" |
| ; |
| |
| namespace SkSL { |
| |
| Compiler::Compiler() |
| : fErrorCount(0) { |
| auto types = std::shared_ptr<SymbolTable>(new SymbolTable(*this)); |
| auto symbols = std::shared_ptr<SymbolTable>(new SymbolTable(types, *this)); |
| fIRGenerator = new IRGenerator(&fContext, symbols, *this); |
| fTypes = types; |
| #define ADD_TYPE(t) types->addWithoutOwnership(fContext.f ## t ## _Type->fName, \ |
| fContext.f ## t ## _Type.get()) |
| ADD_TYPE(Void); |
| ADD_TYPE(Float); |
| ADD_TYPE(Vec2); |
| ADD_TYPE(Vec3); |
| ADD_TYPE(Vec4); |
| ADD_TYPE(Double); |
| ADD_TYPE(DVec2); |
| ADD_TYPE(DVec3); |
| ADD_TYPE(DVec4); |
| ADD_TYPE(Int); |
| ADD_TYPE(IVec2); |
| ADD_TYPE(IVec3); |
| ADD_TYPE(IVec4); |
| ADD_TYPE(UInt); |
| ADD_TYPE(UVec2); |
| ADD_TYPE(UVec3); |
| ADD_TYPE(UVec4); |
| ADD_TYPE(Bool); |
| ADD_TYPE(BVec2); |
| ADD_TYPE(BVec3); |
| ADD_TYPE(BVec4); |
| ADD_TYPE(Mat2x2); |
| types->addWithoutOwnership("mat2x2", fContext.fMat2x2_Type.get()); |
| ADD_TYPE(Mat2x3); |
| ADD_TYPE(Mat2x4); |
| ADD_TYPE(Mat3x2); |
| ADD_TYPE(Mat3x3); |
| types->addWithoutOwnership("mat3x3", fContext.fMat3x3_Type.get()); |
| ADD_TYPE(Mat3x4); |
| ADD_TYPE(Mat4x2); |
| ADD_TYPE(Mat4x3); |
| ADD_TYPE(Mat4x4); |
| types->addWithoutOwnership("mat4x4", fContext.fMat4x4_Type.get()); |
| ADD_TYPE(GenType); |
| ADD_TYPE(GenDType); |
| ADD_TYPE(GenIType); |
| ADD_TYPE(GenUType); |
| ADD_TYPE(GenBType); |
| ADD_TYPE(Mat); |
| ADD_TYPE(Vec); |
| ADD_TYPE(GVec); |
| ADD_TYPE(GVec2); |
| ADD_TYPE(GVec3); |
| ADD_TYPE(GVec4); |
| ADD_TYPE(DVec); |
| ADD_TYPE(IVec); |
| ADD_TYPE(UVec); |
| ADD_TYPE(BVec); |
| |
| ADD_TYPE(Sampler1D); |
| ADD_TYPE(Sampler2D); |
| ADD_TYPE(Sampler3D); |
| ADD_TYPE(SamplerExternalOES); |
| ADD_TYPE(SamplerCube); |
| ADD_TYPE(Sampler2DRect); |
| ADD_TYPE(Sampler1DArray); |
| ADD_TYPE(Sampler2DArray); |
| ADD_TYPE(SamplerCubeArray); |
| ADD_TYPE(SamplerBuffer); |
| ADD_TYPE(Sampler2DMS); |
| ADD_TYPE(Sampler2DMSArray); |
| |
| ADD_TYPE(GSampler1D); |
| ADD_TYPE(GSampler2D); |
| ADD_TYPE(GSampler3D); |
| ADD_TYPE(GSamplerCube); |
| ADD_TYPE(GSampler2DRect); |
| ADD_TYPE(GSampler1DArray); |
| ADD_TYPE(GSampler2DArray); |
| ADD_TYPE(GSamplerCubeArray); |
| ADD_TYPE(GSamplerBuffer); |
| ADD_TYPE(GSampler2DMS); |
| ADD_TYPE(GSampler2DMSArray); |
| |
| ADD_TYPE(Sampler1DShadow); |
| ADD_TYPE(Sampler2DShadow); |
| ADD_TYPE(SamplerCubeShadow); |
| ADD_TYPE(Sampler2DRectShadow); |
| ADD_TYPE(Sampler1DArrayShadow); |
| ADD_TYPE(Sampler2DArrayShadow); |
| ADD_TYPE(SamplerCubeArrayShadow); |
| ADD_TYPE(GSampler2DArrayShadow); |
| ADD_TYPE(GSamplerCubeArrayShadow); |
| |
| Modifiers::Flag ignored1; |
| std::vector<std::unique_ptr<ProgramElement>> ignored2; |
| this->internalConvertProgram(SKSL_INCLUDE, &ignored1, &ignored2); |
| fIRGenerator->fSymbolTable->markAllFunctionsBuiltin(); |
| ASSERT(!fErrorCount); |
| } |
| |
| Compiler::~Compiler() { |
| delete fIRGenerator; |
| } |
| |
| // add the definition created by assigning to the lvalue to the definition set |
| void Compiler::addDefinition(const Expression* lvalue, const Expression* expr, |
| std::unordered_map<const Variable*, const Expression*>* definitions) { |
| switch (lvalue->fKind) { |
| case Expression::kVariableReference_Kind: { |
| const Variable& var = ((VariableReference*) lvalue)->fVariable; |
| if (var.fStorage == Variable::kLocal_Storage) { |
| (*definitions)[&var] = expr; |
| } |
| break; |
| } |
| case Expression::kSwizzle_Kind: |
| // We consider the variable written to as long as at least some of its components have |
| // been written to. This will lead to some false negatives (we won't catch it if you |
| // write to foo.x and then read foo.y), but being stricter could lead to false positives |
| // (we write to foo.x, and then pass foo to a function which happens to only read foo.x, |
| // but since we pass foo as a whole it is flagged as an error) unless we perform a much |
| // more complicated whole-program analysis. This is probably good enough. |
| this->addDefinition(((Swizzle*) lvalue)->fBase.get(), |
| fContext.fDefined_Expression.get(), |
| definitions); |
| break; |
| case Expression::kIndex_Kind: |
| // see comments in Swizzle |
| this->addDefinition(((IndexExpression*) lvalue)->fBase.get(), |
| fContext.fDefined_Expression.get(), |
| definitions); |
| break; |
| case Expression::kFieldAccess_Kind: |
| // see comments in Swizzle |
| this->addDefinition(((FieldAccess*) lvalue)->fBase.get(), |
| fContext.fDefined_Expression.get(), |
| definitions); |
| break; |
| default: |
| // not an lvalue, can't happen |
| ASSERT(false); |
| } |
| } |
| |
| // add local variables defined by this node to the set |
| void Compiler::addDefinitions(const BasicBlock::Node& node, |
| std::unordered_map<const Variable*, const Expression*>* definitions) { |
| switch (node.fKind) { |
| case BasicBlock::Node::kExpression_Kind: { |
| const Expression* expr = (Expression*) node.fNode; |
| if (expr->fKind == Expression::kBinary_Kind) { |
| const BinaryExpression* b = (BinaryExpression*) expr; |
| if (b->fOperator == Token::EQ) { |
| this->addDefinition(b->fLeft.get(), b->fRight.get(), definitions); |
| } |
| } |
| break; |
| } |
| case BasicBlock::Node::kStatement_Kind: { |
| const Statement* stmt = (Statement*) node.fNode; |
| if (stmt->fKind == Statement::kVarDeclarations_Kind) { |
| const VarDeclarationsStatement* vd = (VarDeclarationsStatement*) stmt; |
| for (const VarDeclaration& decl : vd->fDeclaration->fVars) { |
| if (decl.fValue) { |
| (*definitions)[decl.fVar] = decl.fValue.get(); |
| } |
| } |
| } |
| break; |
| } |
| } |
| } |
| |
| void Compiler::scanCFG(CFG* cfg, BlockId blockId, std::set<BlockId>* workList) { |
| BasicBlock& block = cfg->fBlocks[blockId]; |
| |
| // compute definitions after this block |
| std::unordered_map<const Variable*, const Expression*> after = block.fBefore; |
| for (const BasicBlock::Node& n : block.fNodes) { |
| this->addDefinitions(n, &after); |
| } |
| |
| // propagate definitions to exits |
| for (BlockId exitId : block.fExits) { |
| BasicBlock& exit = cfg->fBlocks[exitId]; |
| for (const auto& pair : after) { |
| const Expression* e1 = pair.second; |
| if (exit.fBefore.find(pair.first) == exit.fBefore.end()) { |
| exit.fBefore[pair.first] = e1; |
| } else { |
| const Expression* e2 = exit.fBefore[pair.first]; |
| if (e1 != e2) { |
| // definition has changed, merge and add exit block to worklist |
| workList->insert(exitId); |
| if (!e1 || !e2) { |
| exit.fBefore[pair.first] = nullptr; |
| } else { |
| exit.fBefore[pair.first] = fContext.fDefined_Expression.get(); |
| } |
| } |
| } |
| } |
| } |
| } |
| |
| // returns a map which maps all local variables in the function to null, indicating that their value |
| // is initially unknown |
| static std::unordered_map<const Variable*, const Expression*> compute_start_state(const CFG& cfg) { |
| std::unordered_map<const Variable*, const Expression*> result; |
| for (const auto& block : cfg.fBlocks) { |
| for (const auto& node : block.fNodes) { |
| if (node.fKind == BasicBlock::Node::kStatement_Kind) { |
| const Statement* s = (Statement*) node.fNode; |
| if (s->fKind == Statement::kVarDeclarations_Kind) { |
| const VarDeclarationsStatement* vd = (const VarDeclarationsStatement*) s; |
| for (const VarDeclaration& decl : vd->fDeclaration->fVars) { |
| result[decl.fVar] = nullptr; |
| } |
| } |
| } |
| } |
| } |
| return result; |
| } |
| |
| void Compiler::scanCFG(const FunctionDefinition& f) { |
| CFG cfg = CFGGenerator().getCFG(f); |
| |
| // compute the data flow |
| cfg.fBlocks[cfg.fStart].fBefore = compute_start_state(cfg); |
| std::set<BlockId> workList; |
| for (BlockId i = 0; i < cfg.fBlocks.size(); i++) { |
| workList.insert(i); |
| } |
| while (workList.size()) { |
| BlockId next = *workList.begin(); |
| workList.erase(workList.begin()); |
| this->scanCFG(&cfg, next, &workList); |
| } |
| |
| // check for unreachable code |
| for (size_t i = 0; i < cfg.fBlocks.size(); i++) { |
| if (i != cfg.fStart && !cfg.fBlocks[i].fEntrances.size() && |
| cfg.fBlocks[i].fNodes.size()) { |
| this->error(cfg.fBlocks[i].fNodes[0].fNode->fPosition, "unreachable"); |
| } |
| } |
| if (fErrorCount) { |
| return; |
| } |
| |
| // check for undefined variables |
| for (const BasicBlock& b : cfg.fBlocks) { |
| std::unordered_map<const Variable*, const Expression*> definitions = b.fBefore; |
| for (const BasicBlock::Node& n : b.fNodes) { |
| if (n.fKind == BasicBlock::Node::kExpression_Kind) { |
| const Expression* expr = (const Expression*) n.fNode; |
| if (expr->fKind == Expression::kVariableReference_Kind) { |
| const Variable& var = ((VariableReference*) expr)->fVariable; |
| if (var.fStorage == Variable::kLocal_Storage && |
| !definitions[&var]) { |
| this->error(expr->fPosition, |
| "'" + var.fName + "' has not been assigned"); |
| } |
| } |
| } |
| this->addDefinitions(n, &definitions); |
| } |
| } |
| |
| // check for missing return |
| if (f.fDeclaration.fReturnType != *fContext.fVoid_Type) { |
| if (cfg.fBlocks[cfg.fExit].fEntrances.size()) { |
| this->error(f.fPosition, "function can exit without returning a value"); |
| } |
| } |
| } |
| |
| void Compiler::internalConvertProgram(std::string text, |
| Modifiers::Flag* defaultPrecision, |
| std::vector<std::unique_ptr<ProgramElement>>* result) { |
| Parser parser(text, *fTypes, *this); |
| std::vector<std::unique_ptr<ASTDeclaration>> parsed = parser.file(); |
| if (fErrorCount) { |
| return; |
| } |
| *defaultPrecision = Modifiers::kHighp_Flag; |
| for (size_t i = 0; i < parsed.size(); i++) { |
| ASTDeclaration& decl = *parsed[i]; |
| switch (decl.fKind) { |
| case ASTDeclaration::kVar_Kind: { |
| std::unique_ptr<VarDeclarations> s = fIRGenerator->convertVarDeclarations( |
| (ASTVarDeclarations&) decl, |
| Variable::kGlobal_Storage); |
| if (s) { |
| result->push_back(std::move(s)); |
| } |
| break; |
| } |
| case ASTDeclaration::kFunction_Kind: { |
| std::unique_ptr<FunctionDefinition> f = fIRGenerator->convertFunction( |
| (ASTFunction&) decl); |
| if (!fErrorCount && f) { |
| this->scanCFG(*f); |
| result->push_back(std::move(f)); |
| } |
| break; |
| } |
| case ASTDeclaration::kModifiers_Kind: { |
| std::unique_ptr<ModifiersDeclaration> f = fIRGenerator->convertModifiersDeclaration( |
| (ASTModifiersDeclaration&) decl); |
| if (f) { |
| result->push_back(std::move(f)); |
| } |
| break; |
| } |
| case ASTDeclaration::kInterfaceBlock_Kind: { |
| std::unique_ptr<InterfaceBlock> i = fIRGenerator->convertInterfaceBlock( |
| (ASTInterfaceBlock&) decl); |
| if (i) { |
| result->push_back(std::move(i)); |
| } |
| break; |
| } |
| case ASTDeclaration::kExtension_Kind: { |
| std::unique_ptr<Extension> e = fIRGenerator->convertExtension((ASTExtension&) decl); |
| if (e) { |
| result->push_back(std::move(e)); |
| } |
| break; |
| } |
| case ASTDeclaration::kPrecision_Kind: { |
| *defaultPrecision = ((ASTPrecision&) decl).fPrecision; |
| break; |
| } |
| default: |
| ABORT("unsupported declaration: %s\n", decl.description().c_str()); |
| } |
| } |
| } |
| |
| std::unique_ptr<Program> Compiler::convertProgram(Program::Kind kind, std::string text) { |
| fErrorText = ""; |
| fErrorCount = 0; |
| fIRGenerator->pushSymbolTable(); |
| std::vector<std::unique_ptr<ProgramElement>> elements; |
| Modifiers::Flag ignored; |
| switch (kind) { |
| case Program::kVertex_Kind: |
| this->internalConvertProgram(SKSL_VERT_INCLUDE, &ignored, &elements); |
| break; |
| case Program::kFragment_Kind: |
| this->internalConvertProgram(SKSL_FRAG_INCLUDE, &ignored, &elements); |
| break; |
| } |
| fIRGenerator->fSymbolTable->markAllFunctionsBuiltin(); |
| Modifiers::Flag defaultPrecision; |
| this->internalConvertProgram(text, &defaultPrecision, &elements); |
| auto result = std::unique_ptr<Program>(new Program(kind, defaultPrecision, std::move(elements), |
| fIRGenerator->fSymbolTable)); |
| fIRGenerator->popSymbolTable(); |
| this->writeErrorCount(); |
| return result; |
| } |
| |
| void Compiler::error(Position position, std::string msg) { |
| fErrorCount++; |
| fErrorText += "error: " + position.description() + ": " + msg.c_str() + "\n"; |
| } |
| |
| std::string Compiler::errorText() { |
| std::string result = fErrorText; |
| return result; |
| } |
| |
| void Compiler::writeErrorCount() { |
| if (fErrorCount) { |
| fErrorText += to_string(fErrorCount) + " error"; |
| if (fErrorCount > 1) { |
| fErrorText += "s"; |
| } |
| fErrorText += "\n"; |
| } |
| } |
| |
| bool Compiler::toSPIRV(Program::Kind kind, const std::string& text, std::ostream& out) { |
| auto program = this->convertProgram(kind, text); |
| if (fErrorCount == 0) { |
| SkSL::SPIRVCodeGenerator cg(&fContext); |
| cg.generateCode(*program.get(), out); |
| ASSERT(!out.rdstate()); |
| } |
| return fErrorCount == 0; |
| } |
| |
| bool Compiler::toSPIRV(Program::Kind kind, const std::string& text, std::string* out) { |
| std::stringstream buffer; |
| bool result = this->toSPIRV(kind, text, buffer); |
| if (result) { |
| *out = buffer.str(); |
| } |
| return result; |
| } |
| |
| bool Compiler::toGLSL(Program::Kind kind, const std::string& text, GLCaps caps, |
| std::ostream& out) { |
| auto program = this->convertProgram(kind, text); |
| if (fErrorCount == 0) { |
| SkSL::GLSLCodeGenerator cg(&fContext, caps); |
| cg.generateCode(*program.get(), out); |
| ASSERT(!out.rdstate()); |
| } |
| return fErrorCount == 0; |
| } |
| |
| bool Compiler::toGLSL(Program::Kind kind, const std::string& text, GLCaps caps, |
| std::string* out) { |
| std::stringstream buffer; |
| bool result = this->toGLSL(kind, text, caps, buffer); |
| if (result) { |
| *out = buffer.str(); |
| } |
| return result; |
| } |
| |
| } // namespace |