simplify_args.h

 
#ifndef BACKENDS_TOFINO_BF_P4C_MIDEND_SIMPLIFY_ARGS_H_
#define BACKENDS_TOFINO_BF_P4C_MIDEND_SIMPLIFY_ARGS_H_
 
#include "backends/tofino/bf-p4c/midend/check_header_alignment.h"
#include "backends/tofino/bf-p4c/midend/copy_header.h"
#include "backends/tofino/bf-p4c/midend/type_checker.h"
#include "frontends/common/resolveReferences/resolveReferences.h"
#include "frontends/p4/cloner.h"
#include "frontends/p4/moveDeclarations.h"
#include "frontends/p4/typeMap.h"
#include "ir/ir.h"
#include "midend/flattenHeaders.h"
 
namespace BFN {
 
struct InjectTmpVar : public PassManager {
    class DoInject : public Transform {
        P4::ReferenceMap *refMap;
        P4::TypeMap *typeMap;
 
        bool isNestedStruct(const IR::Expression *expr);
 
     public:
        explicit DoInject(P4::ReferenceMap *refMap, P4::TypeMap *typeMap)
            : refMap(refMap), typeMap(typeMap) {}
        const IR::Node *postorder(IR::AssignmentStatement *as) override;
        const IR::Node *postorder(IR::MethodCallStatement *mcs) override;
    };
 
    InjectTmpVar(P4::ReferenceMap *refMap, P4::TypeMap *typeMap) {
        auto typeChecking = new BFN::TypeChecking(refMap, typeMap, true);
        passes.push_back(typeChecking);
        passes.push_back(new DoInject(refMap, typeMap));
        passes.push_back(new P4::ClearTypeMap(typeMap));
        passes.push_back(typeChecking);
        passes.push_back(new P4::MoveDeclarations());
        passes.push_back(new P4::ClearTypeMap(typeMap));
        passes.push_back(new BFN::CopyHeaders(refMap, typeMap, typeChecking));
        passes.push_back(new P4::ClearTypeMap(typeMap));
        passes.push_back(typeChecking);
    }
};
 
class FlattenHeader : public Modifier {
    P4::CloneExpressions cloner;
    const P4::TypeMap *typeMap;
    IR::Type_Header *flattenedHeader = nullptr;
    std::vector<cstring> nameSegments{};
    std::vector<const IR::Annotations *> allAnnotations{};
    std::vector<Util::SourceInfo> srcInfos{};
    cstring makeName(std::string_view sep) const;
    void flattenType(const IR::Type *type);
    const IR::Annotations *mergeAnnotations() const;
 
    const IR::Member *flattenedMember;
    std::vector<cstring> memberSegments{};
    std::map<cstring, cstring> fieldNameMap;
    std::map<cstring, std::tuple<const IR::Expression *, cstring>> replacementMap;
    cstring makeMember(std::string_view sep) const;
    void flattenMember(const IR::Member *member);
    const IR::Member *doFlattenMember(const IR::Member *member);
 
    std::vector<cstring> pathSegments{};
    cstring makePath(std::string_view sep) const;
    void flattenStructInitializer(const IR::StructExpression *e,
                                  IR::IndexedVector<IR::NamedExpression> *c);
    IR::StructExpression *doFlattenStructInitializer(const IR::StructExpression *e);
    IR::ListExpression *flatten_list(const IR::ListExpression *args);
    void explode(const IR::Expression *, IR::Vector<IR::Expression> *);
    int memberDepth(const IR::Member *m);
    const IR::Member *getTailMembers(const IR::Member *m, int depth);
    const IR::PathExpression *replaceSrcInfo(const IR::PathExpression *tgt,
                                             const IR::PathExpression *src);
    const IR::Member *replaceSrcInfo(const IR::Member *tgt, const IR::Member *src);
    const IR::Expression *balancedReplaceSrcInfo(const IR::Expression *tgt, const IR::Member *src);
 
    std::function<bool(const Context *, const IR::Type_StructLike *)> policy;
 
 public:
    explicit FlattenHeader(
        P4::TypeMap *typeMap,
        std::function<bool(const Context *, const IR::Type_StructLike *)> policy =
            [](const Context *, const IR::Type_StructLike *) -> bool { return false; })
        : typeMap(typeMap), policy(policy) {}
    bool preorder(IR::Type_Header *header) override;
    bool preorder(IR::Member *member) override;
    void postorder(IR::Member *member) override;
    bool preorder(IR::MethodCallExpression *mc) override;
};
 
class EliminateHeaders : public Transform {
    P4::ReferenceMap *refMap;
    P4::TypeMap *typeMap;
    std::function<bool(const Context *, const IR::Type_StructLike *)> policy;
 
 public:
    EliminateHeaders(P4::ReferenceMap *refMap, P4::TypeMap *typeMap,
                     std::function<bool(const Context *, const IR::Type_StructLike *)> policy)
        : refMap(refMap), typeMap(typeMap), policy(policy) {
        setName("EliminateHeaders");
    }
    std::map<cstring, IR::IndexedVector<IR::NamedExpression>> rewriteTupleType;
    std::map<const IR::MethodCallExpression *, const IR::Type *> rewriteOtherType;
    const IR::Node *preorder(IR::Argument *arg) override;
    void elimConcat(IR::IndexedVector<IR::NamedExpression> &output, const IR::Concat *expr);
};
 
class RewriteTypeArguments : public Transform {
    const EliminateHeaders *eeh;
 
 public:
    explicit RewriteTypeArguments(const EliminateHeaders *eeh) : eeh(eeh) {}
    const IR::Node *preorder(IR::Type_Struct *type_struct) override;
    const IR::Node *preorder(IR::MethodCallExpression *mc) override;
};
 
class SimplifyEmitArgs : public PassManager {
 public:
    SimplifyEmitArgs(
        P4::ReferenceMap *refMap, P4::TypeMap *typeMap,
        std::function<bool(const Context *, const IR::Type_StructLike *)> policy =
            [](const Context *, const IR::Type_StructLike *) -> bool { return false; }) {
        auto eliminateHeaders = new EliminateHeaders(refMap, typeMap, policy);
        auto rewriteTypeArguments = new RewriteTypeArguments(eliminateHeaders);
        passes.push_back(new InjectTmpVar(refMap, typeMap));
        passes.push_back(new FlattenHeader(typeMap));
        passes.push_back(new P4::ClearTypeMap(typeMap));
        passes.push_back(new BFN::TypeChecking(refMap, typeMap, true));
        passes.push_back(eliminateHeaders);
        passes.push_back(rewriteTypeArguments);
        // After eliminateHeaders we need to do TypeInference that might
        // change new ListExpressions to StructExpressions
        passes.push_back(new P4::ClearTypeMap(typeMap));
        passes.push_back(new BFN::TypeChecking(refMap, typeMap, true));
        passes.push_back(new PadFlexibleField(refMap, typeMap)),
            passes.push_back(new P4::ClearTypeMap(typeMap));
        passes.push_back(new BFN::TypeChecking(refMap, typeMap, true));
    }
};
 
}  // namespace BFN
 
#endif /* BACKENDS_TOFINO_BF_P4C_MIDEND_SIMPLIFY_ARGS_H_ */