source: src/Validate/ImplementEnumFunc.cpp@ c2a4b62

#include "AST/Create.hpp"
#include "AST/Pass.hpp"
#include "AST/TranslationUnit.hpp"
#include "CodeGen/OperatorTable.h"  // for isCtorDtor, isCtorDtorAssign
#include "InitTweak/InitTweak.h"    // for isAssignment, isCopyConstructor
namespace Validate {

namespace {
class EnumAttrFuncGenerator {
        const ast::EnumDecl* decl;
        const ast::EnumInstType* instType;
        unsigned int functionNesting;
        ast::Linkage::Spec proto_linkage;

public:
        std::list<ast::ptr<ast::Decl>> forwards;
        std::list<ast::ptr<ast::Decl>> definitions;

        void generateAndAppendFunctions(std::list<ast::ptr<ast::Decl>>&);

        EnumAttrFuncGenerator(
                        const ast::EnumDecl* decl,
                        const ast::EnumInstType* instType,
                        unsigned int functionNesting )
                : decl(decl),
                  instType{instType},
                  functionNesting{functionNesting},
                  proto_linkage{ast::Linkage::Cforall} {}

private:
        const CodeLocation& getLocation() const { return decl->location; }

        ast::FunctionDecl* genProto(
                std::string&& name, std::vector<ast::ptr<ast::DeclWithType>>&& params,
                std::vector<ast::ptr<ast::DeclWithType>>&& returns) const;

        void produceDecl(const ast::FunctionDecl* decl);
        void produceForwardDecl(const ast::FunctionDecl* decl);

        const ast::Decl* getDecl() const { return decl; }

        // Implement Bounded trait
        void genBoundedFunctions();
        ast::FunctionDecl* genBoundedProto(const char *) const;
        void genBoundedBody(ast::FunctionDecl* func) const;

        // Implement Serial trait
        void genSerialTraitFuncs();
        ast::FunctionDecl* genFromIntProto() const;
        ast::FunctionDecl* genFromInstanceProto() const;
        ast::FunctionDecl* genInstToInstFuncProto(const char* func) const;
        void genFromIntBody(ast::FunctionDecl *) const; 
        void genFromInstanceBody(ast::FunctionDecl *) const;
        void genSuccPredBody(ast::FunctionDecl *, const char *) const;

        // Implement TypedEnum trait
        void genTypedEnumFuncs();
        void genTypedEnumFunction(const ast::EnumAttribute attr);
        ast::FunctionDecl* genPosnProto() const;
        ast::FunctionDecl* genLabelProto() const;
        ast::FunctionDecl* genValueProto() const;
        void genValueOrLabelBody(
                ast::FunctionDecl* func, ast::ObjectDecl* arrDecl) const;
        void genPosnBody(ast::FunctionDecl* func) const;

        ////////////////

        // ---------------------------------------------------
        // ast::FunctionDecl* genAttrCtorProto() const;
        /// Changes the node inside a pointer so that it has the unused attribute.
        void addUnusedAttribute(ast::ptr<ast::DeclWithType>& declPtr) {
                ast::DeclWithType* decl = declPtr.get_and_mutate();
                decl->attributes.push_back(new ast::Attribute("unused"));
        }

        ast::ObjectDecl* dstParam() const {
                return new ast::ObjectDecl(getLocation(), "_dst",
                                           new ast::ReferenceType(new ast::EnumAttrType(
                                               ast::deepCopy(instType))));
        }

        ast::ObjectDecl* srcParam() const {
                return new ast::ObjectDecl(
                        getLocation(), "_src",
                        new ast::EnumAttrType(ast::deepCopy(instType)));
        }

        // ----------------------------------------------------

        const ast::Init* getAutoInit(const ast::Init* prev) const;

        std::vector<ast::ptr<ast::Init>> genLabelInit() const;

        std::vector<ast::ptr<ast::Init>> genValueInit() const;
        ast::ObjectDecl* genAttrArrayProto(
                const ast::EnumAttribute attr, const CodeLocation& location,
                std::vector<ast::ptr<ast::Init>>& inits) const;
};

std::vector<ast::ptr<ast::Init>> EnumAttrFuncGenerator::genLabelInit() const {
        std::vector<ast::ptr<ast::Init>> inits;
        for (size_t i = 0; i < decl->members.size(); i++) {
                ast::ptr<ast::Decl> mem = decl->members.at(i);
                auto memAsObjectDecl = mem.as<ast::ObjectDecl>();
                assert(memAsObjectDecl);
                inits.emplace_back(new ast::SingleInit(
                        mem->location,
                        ast::ConstantExpr::from_string(mem->location, mem->name)));
        }
        return inits;
}

std::vector<ast::ptr<ast::Init>> EnumAttrFuncGenerator::genValueInit() const {
        std::vector<ast::ptr<ast::Init>> inits;
        for (size_t i = 0; i < decl->members.size(); i++) {
                ast::ptr<ast::Decl> mem = decl->members.at(i);
                auto memAsObjectDecl = mem.as<ast::ObjectDecl>();
                assert(memAsObjectDecl);
                if (memAsObjectDecl->init) {
                        inits.emplace_back(memAsObjectDecl->init);
                } else {
                        const CodeLocation& location = mem->location;
                        if (i == 0) {
                                inits.emplace_back(new ast::SingleInit(
                                        location, ast::ConstantExpr::from_int(mem->location, 0)));
                        } else {
                                inits.emplace_back(getAutoInit(inits.at(i - 1)));
                        }
                }
        }
        return inits;
}
const ast::Init* EnumAttrFuncGenerator::getAutoInit(
        const ast::Init* prev) const {
        if (prev == nullptr) {
                return new ast::SingleInit(
                        getLocation(), ast::ConstantExpr::from_int(getLocation(), 0));
        }
        auto prevInit = dynamic_cast<const ast::SingleInit*>(prev);
        assert(prevInit);
        auto prevInitExpr = prevInit->value;
        if (auto constInit = prevInitExpr.as<ast::ConstantExpr>()) {
                // Assume no string literal for now
                return new ast::SingleInit(
                        getLocation(), ast::ConstantExpr::from_int(
                                getLocation(), constInit->intValue() + 1));
        } else {
                auto untypedThisInit = new ast::UntypedExpr(
                        getLocation(), new ast::NameExpr(getLocation(), "?++"),
                        {prevInitExpr});
                return new ast::SingleInit(getLocation(), untypedThisInit);
        }
}

ast::FunctionDecl* EnumAttrFuncGenerator::genProto(
        std::string&& name, std::vector<ast::ptr<ast::DeclWithType>>&& params,
        std::vector<ast::ptr<ast::DeclWithType>>&& returns) const {
        ast::FunctionDecl* decl = new ast::FunctionDecl(
                // Auto-generated routines use the type declaration's location.
                getLocation(), std::move(name), {}, {}, std::move(params),
                std::move(returns),
                // Only a prototype, no body.
                nullptr,
                // Use static storage if we are at the top level.
                (0 < functionNesting) ? ast::Storage::Classes() : ast::Storage::Static,
                proto_linkage, std::vector<ast::ptr<ast::Attribute>>(),
                // Auto-generated routines are inline to avoid conflicts.
                ast::Function::Specs(ast::Function::Inline));
        decl->fixUniqueId();
        return decl;
}

void EnumAttrFuncGenerator::produceDecl(const ast::FunctionDecl* decl) {
        assert(nullptr != decl->stmts);

        definitions.push_back(decl);
}

void EnumAttrFuncGenerator::produceForwardDecl(const ast::FunctionDecl* decl) {
        if (0 != functionNesting) return;
        ast::FunctionDecl* fwd =
                (decl->stmts) ? ast::asForward(decl) : ast::deepCopy(decl);
        fwd->fixUniqueId();
        forwards.push_back(fwd);
}

ast::FunctionDecl* EnumAttrFuncGenerator::genPosnProto() const {
    return genProto(
        "posE",
        {new ast::ObjectDecl(getLocation(), "_i", new ast::EnumInstType(decl))},
        {new ast::ObjectDecl(getLocation(), "_ret",
            new ast::BasicType(ast::BasicKind::UnsignedInt))});
}

ast::FunctionDecl* EnumAttrFuncGenerator::genLabelProto() const {
        return genProto(
                "labelE",
                {new ast::ObjectDecl(getLocation(), "_i", new ast::EnumInstType(decl))},
                {new ast::ObjectDecl(
                        getLocation(), "_ret",
                        new ast::PointerType(new ast::BasicType{ast::BasicKind::Char}))});
}

ast::FunctionDecl* EnumAttrFuncGenerator::genValueProto() const {
        return genProto(
                "valueE",
                {new ast::ObjectDecl(getLocation(), "_i", new ast::EnumInstType(decl))},
                {new ast::ObjectDecl(getLocation(), "_ret",
                                     ast::deepCopy(decl->base))});
}

ast::FunctionDecl* EnumAttrFuncGenerator::genFromIntProto() const {
        return genProto(
                "fromInt",
                {new ast::ObjectDecl(getLocation(), "_i", new ast::BasicType(ast::BasicKind::UnsignedInt))},
                {new ast::ObjectDecl(getLocation(), "_ret", new ast::EnumInstType(decl))}
        );
}

ast::FunctionDecl* EnumAttrFuncGenerator::genFromInstanceProto() const {
        return genProto(
                "fromInstance",
                {new ast::ObjectDecl(getLocation(), "_i", new ast::EnumInstType(decl))},
                {new ast::ObjectDecl(getLocation(), "_ret", new ast::BasicType(ast::BasicKind::UnsignedInt))}
        );
}

void EnumAttrFuncGenerator::genFromIntBody(ast::FunctionDecl* func) const {
        auto params = func->params;
        assert( params.size() == 1 );
        auto param = params.front();
        auto castExpr = new ast::CastExpr(
                func->location,
                new ast::VariableExpr(func->location, param),
                new ast::EnumInstType(decl),
                ast::GeneratedFlag::ExplicitCast
        );
        func->stmts = new ast::CompoundStmt(
                func->location, {new ast::ReturnStmt(func->location, castExpr)}
        );
}

void EnumAttrFuncGenerator::genFromInstanceBody(ast::FunctionDecl* func) const {
        auto params = func->params;
        assert( params.size() == 1 );
        auto param = params.front();
        ast::UntypedExpr* untyped = ast::UntypedExpr::createCall(
                func->location, "posE", { new ast::VariableExpr(func->location, param) });
        func->stmts = new ast::CompoundStmt(
                func->location, {new ast::ReturnStmt(func->location, untyped)}
        );
}

void EnumAttrFuncGenerator::genSuccPredBody(ast::FunctionDecl * func, const char* opt) const {
        auto params = func->params;
        assert( params.size() == 1 );
        auto param = params.front();
        auto enumToInt = new ast::CastExpr(
                func->location,
                new ast::VariableExpr(func->location, param),
                new ast::BasicType(ast::BasicKind::UnsignedInt),
                ast::GeneratedFlag::ExplicitCast
        );
        ast::UntypedExpr* addOneExpr = ast::UntypedExpr::createCall( func->location,
                opt,
                {enumToInt,
                ast::ConstantExpr::from_int(func->location, 1)}
        );
        auto intToEnum = new ast::CastExpr(
                func->location,
                addOneExpr,
                new ast::EnumInstType( decl ),
                ast::GeneratedFlag::ExplicitCast
        );
        func->stmts = new ast::CompoundStmt(
                func->location, {
                        new ast::ReturnStmt(
                                func->location,
                                intToEnum
                        )
                }
        );
}


void EnumAttrFuncGenerator::genSerialTraitFuncs() {
        ast::FunctionDecl * protos[4] = {
                genFromIntProto(),
                genFromInstanceProto(),
                genInstToInstFuncProto("succ"),
                genInstToInstFuncProto("pred")
        };
        for (auto& proto: protos) produceForwardDecl(proto);
        genFromIntBody(protos[0]);
        genFromInstanceBody(protos[1]);
        genSuccPredBody(protos[2], "?+?");
        genSuccPredBody(protos[3], "?-?");
        for (auto& proto: protos) produceDecl(proto);
}

ast::FunctionDecl* EnumAttrFuncGenerator::genInstToInstFuncProto(const char * func) const {
        return genProto(
                func,
                {new ast::ObjectDecl(getLocation(), "_i", new ast::EnumInstType(decl))},
                {new ast::ObjectDecl(getLocation(), "_ret",
                                     new ast::EnumInstType(decl))});
}

ast::FunctionDecl* EnumAttrFuncGenerator::genBoundedProto(const char * func) const {
    return genProto(func, {}, {
        new ast::ObjectDecl(getLocation(), "_i", new ast::EnumInstType(decl))
    });
}

void EnumAttrFuncGenerator::genBoundedBody(ast::FunctionDecl* func) const {
        const CodeLocation & loc = func->location;
        auto mem = func->name=="lowerBound"?  decl->members.front() : decl->members.back();
        auto expr = new ast::NameExpr( loc, mem->name );
        func->stmts = new ast::CompoundStmt( loc, {new ast::ReturnStmt(loc, expr)});
}

void EnumAttrFuncGenerator::genBoundedFunctions() {
        ast::FunctionDecl * boundedProtos[2] = {genBoundedProto("upperBound"), genBoundedProto("lowerBound")};
        for (auto & protos: boundedProtos) {
                produceForwardDecl(protos);
                genBoundedBody(protos);
                produceDecl(protos);
        }
}

inline ast::EnumAttrType * getPosnType( const ast::EnumDecl * decl ) {
        return new ast::EnumAttrType(new ast::EnumInstType(decl), ast::EnumAttribute::Posn);
}

ast::ObjectDecl* EnumAttrFuncGenerator::genAttrArrayProto(
        const ast::EnumAttribute attr, const CodeLocation& location,
        std::vector<ast::ptr<ast::Init>>& inits) const {
        ast::ArrayType* arrT = new ast::ArrayType(
                attr == ast::EnumAttribute::Value
                        ? decl->base
                        : new ast::PointerType(new ast::BasicType{ast::BasicKind::Char}),
                ast::ConstantExpr::from_int(decl->location, decl->members.size()),
                ast::LengthFlag::FixedLen, ast::DimensionFlag::DynamicDim);

        ast::ObjectDecl* objDecl =
                new ast::ObjectDecl(
                        decl->location, decl->getUnmangeldArrayName( attr ),
                        arrT, new ast::ListInit( location, std::move( inits ) ),
                        ast::Storage::Static, ast::Linkage::AutoGen );

        return objDecl;
}

void EnumAttrFuncGenerator::genValueOrLabelBody(
        ast::FunctionDecl* func, ast::ObjectDecl* arrDecl) const {
        ast::UntypedExpr* untyped = ast::UntypedExpr::createCall(
                func->location, "?[?]",
                {new ast::NameExpr(func->location, arrDecl->name),
                new ast::CastExpr(
                        func->location,
                        new ast::VariableExpr( func->location, func->params.front() ),
                        new ast::EnumAttrType( new ast::EnumInstType(decl),
                                ast::EnumAttribute::Posn))});
        func->stmts = new ast::CompoundStmt(
                func->location, {new ast::ReturnStmt(func->location, untyped)});
}

void EnumAttrFuncGenerator::genPosnBody(ast::FunctionDecl* func) const {
        auto castExpr = new ast::CastExpr(
                func->location,
                new ast::VariableExpr(func->location, func->params.front()),
                new ast::EnumAttrType(new ast::EnumInstType(decl),
                                                          ast::EnumAttribute::Posn));
        func->stmts = new ast::CompoundStmt(
                func->location, {new ast::ReturnStmt(func->location, castExpr)});
}

void EnumAttrFuncGenerator::genTypedEnumFunction(const ast::EnumAttribute attr) {
        if (attr == ast::EnumAttribute::Value ||
                attr == ast::EnumAttribute::Label) {
                // TypedEnum's backing arrays
                std::vector<ast::ptr<ast::Init>> inits =
                        attr == ast::EnumAttribute::Value ? genValueInit() : genLabelInit();
                ast::ObjectDecl* arrayProto =
                        genAttrArrayProto(attr, getLocation(), inits);
                forwards.push_back(arrayProto);

                ast::FunctionDecl* funcProto = ( attr == ast::EnumAttribute::Value )
                                               ? genValueProto()
                                               : genLabelProto();
                produceForwardDecl(funcProto);
                genValueOrLabelBody(funcProto, arrayProto);
                produceDecl(funcProto);
        } else {
                ast::FunctionDecl* funcProto = genPosnProto();
                produceForwardDecl(funcProto);
                genPosnBody(funcProto);
                produceDecl(funcProto);
        }
}

void EnumAttrFuncGenerator::genTypedEnumFuncs() {
        if (decl->base) genTypedEnumFunction(ast::EnumAttribute::Value);
        genTypedEnumFunction(ast::EnumAttribute::Label);
        genTypedEnumFunction(ast::EnumAttribute::Posn); 
}

void EnumAttrFuncGenerator::generateAndAppendFunctions(
        std::list<ast::ptr<ast::Decl>>& decls) {
        // Generate the functions (they go into forwards and definitions).
        genTypedEnumFuncs();
        genSerialTraitFuncs();
        genBoundedFunctions();
        // Now export the lists contents.
        decls.splice(decls.end(), forwards);
        decls.splice(decls.end(), definitions);
}

// ---------------------------------------------------------

struct ImplementEnumFunc final :
                public ast::WithDeclsToAdd<>, public ast::WithShortCircuiting {
        void previsit(const ast::EnumDecl* enumDecl);
        void previsit(const ast::FunctionDecl* functionDecl);
        void postvisit(const ast::FunctionDecl* functionDecl);

private:
        // Current level of nested functions.
        unsigned int functionNesting = 0;
};

void ImplementEnumFunc::previsit(const ast::EnumDecl* enumDecl) {
        if (!enumDecl->body || !enumDecl->isTyped) return;
        ast::EnumInstType enumInst(enumDecl->name);
        enumInst.base = enumDecl;
        EnumAttrFuncGenerator gen(enumDecl, &enumInst, functionNesting);
        gen.generateAndAppendFunctions(declsToAddAfter);
}

void ImplementEnumFunc::previsit(const ast::FunctionDecl*) {
        functionNesting += 1;
}

void ImplementEnumFunc::postvisit(const ast::FunctionDecl*) {
        functionNesting -= 1;
}

} // namespace

void implementEnumFunc(ast::TranslationUnit& translationUnit) {
        ast::Pass<ImplementEnumFunc>::run(translationUnit);
}

} // namespace Validate