parser_header_sequences.h

 
#ifndef BF_P4C_PARDE_PARSER_HEADER_SEQUENCES_H_
#define BF_P4C_PARDE_PARSER_HEADER_SEQUENCES_H_
 
#include "backends/tofino/bf-p4c/ir/control_flow_visitor.h"
#include "backends/tofino/bf-p4c/ir/gress.h"
#include "backends/tofino/bf-p4c/parde/parde_visitor.h"
#include "backends/tofino/bf-p4c/phv/phv_fields.h"
#include "ir/ir.h"
#include "ir/visitor.h"
 
namespace {
 
static constexpr unsigned int numHeaderIDs = 255;
static constexpr unsigned int numHeadersPerSeq = 16;
static constexpr unsigned int payloadHeaderID = 254;
static cstring payloadHeaderStateName = "$final"_cs;
static cstring payloadHeaderName = "payload"_cs;
 
}  // namespace
 
class ParserHeaderSequences : public BFN::ControlFlowVisitor, public PardeInspector {
 protected:
    PhvInfo &phv;
 
    void record_header(gress_t gress, cstring header, size_t size);
 
 public:
    std::map<gress_t, ordered_set<cstring>> headers;
    std::map<std::pair<gress_t, cstring>, int> header_ids;
 
    std::map<gress_t, std::vector<ordered_set<cstring>>> sequences;
    // Name to size in bits of headers extracted in the ingress.
    std::map<cstring, size_t> header_sizes;
 
    explicit ParserHeaderSequences(PhvInfo &phv) : phv(phv) {}
 
    Visitor::profile_t init_apply(const IR::Node *node) override;
    bool preorder(const IR::BFN::Parser *) override;
    bool preorder(const IR::BFN::Extract *) override;
 
    void flow_merge(Visitor &) override;
    void flow_copy(::ControlFlowVisitor &) override;
 
    void end_apply() override;
 
    ParserHeaderSequences *clone() const override { return new ParserHeaderSequences(*this); }
};
 
#endif /* BF_P4C_PARDE_PARSER_HEADER_SEQUENCES_H_ */