backends/common/programStructure.h

/*
Copyright 2013-present Barefoot Networks, Inc.
 
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
 
    http://www.apache.org/licenses/LICENSE-2.0
 
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
 
#ifndef BACKENDS_COMMON_PROGRAMSTRUCTURE_H_
#define BACKENDS_COMMON_PROGRAMSTRUCTURE_H_
 
#include "backends/common/metermap.h"
#include "ir/ir.h"
#include "ir/visitor.h"
#include "lib/ordered_map.h"
#include "lib/ordered_set.h"
 
namespace P4 {
 
using ResourceMap = ordered_map<const IR::Node *, const IR::CompileTimeValue *>;

class ProgramStructure {
 public:
    ordered_map<const IR::P4Action *, const IR::P4Control *> actions;
    ordered_map<const IR::Parameter *, unsigned> index;
    ordered_set<const IR::Parameter *> nonActionParameters;
    ordered_map<const IR::P4Action *, unsigned> ids;
    std::vector<const IR::Declaration_Variable *> variables;
    ordered_map<const IR::IDeclaration *, unsigned int> errorCodesMap;
    DirectMeterMap directMeterMap;
    ordered_map<cstring, const IR::P4Table *> directCounterMap;
    ordered_map<const IR::StructField *, cstring> scalarMetadataFields;
    std::set<cstring> match_kinds;
    ResourceMap resourceMap;
 
    ProgramStructure() {}
};
 
class DiscoverStructure : public Inspector {
 public:
    ProgramStructure *structure;
 
    explicit DiscoverStructure(ProgramStructure *structure) : structure(structure) {
        setName("DiscoverStructure");
    }
    void postorder(const IR::ParameterList *paramList) override;
    void postorder(const IR::P4Action *action) override;
    void postorder(const IR::Declaration_Variable *decl) override;
    void postorder(const IR::Type_Error *errors) override;
    void postorder(const IR::Declaration_MatchKind *kind) override;
};

class BuildResourceMap : public Inspector {
    ResourceMap *resourceMap;
 
 public:
    explicit BuildResourceMap(ResourceMap *resourceMap) : resourceMap(resourceMap) {
        CHECK_NULL(resourceMap);
    }
 
    bool preorder(const IR::ControlBlock *control) override {
        resourceMap->emplace(control->container, control);
        for (auto cv : control->constantValue) {
            resourceMap->emplace(cv.first, cv.second);
        }
 
        for (const auto *c : control->container->controlLocals) {
            if (c->is<IR::InstantiatedBlock>()) {
                resourceMap->emplace(c, control->getValue(c));
            }
        }
        return false;
    }
 
    bool preorder(const IR::ParserBlock *parser) override {
        resourceMap->emplace(parser->container, parser);
        for (auto cv : parser->constantValue) {
            resourceMap->emplace(cv.first, cv.second);
            if (cv.second->is<IR::Block>()) {
                visit(cv.second->getNode());
            }
        }
 
        for (const auto *c : parser->container->parserLocals) {
            if (c->is<IR::InstantiatedBlock>()) {
                resourceMap->emplace(c, parser->getValue(c));
            }
        }
        return false;
    }
 
    bool preorder(const IR::TableBlock *table) override {
        resourceMap->emplace(table->container, table);
        for (auto cv : table->constantValue) {
            resourceMap->emplace(cv.first, cv.second);
            if (cv.second->is<IR::Block>()) {
                visit(cv.second->getNode());
            }
        }
        return false;
    }
 
    bool preorder(const IR::PackageBlock *package) override {
        for (auto cv : package->constantValue) {
            if (cv.second->is<IR::Block>()) {
                visit(cv.second->getNode());
            }
        }
        return false;
    }
 
    bool preorder(const IR::ToplevelBlock *tlb) override {
        const auto *package = tlb->getMain();
        visit(package);
        return false;
    }
};
 
}  // namespace P4
 
#endif /* BACKENDS_COMMON_PROGRAMSTRUCTURE_H_ */