match_source.h

 
#ifndef BACKENDS_TOFINO_BF_ASM_MATCH_SOURCE_H_
#define BACKENDS_TOFINO_BF_ASM_MATCH_SOURCE_H_
 
#include <sstream>
#include <string>
 
#include "backends/tofino/bf-asm/asm-types.h"
#include "lib/stringify.h"

class MatchSource : public IHasDbPrint {
 public:
    virtual int fieldlobit() const = 0;
    virtual int fieldhibit() const = 0;
    virtual unsigned size() const = 0;
    virtual int slicelobit() const = 0;
    virtual int slicehibit() const = 0;
    virtual const char *name() const = 0;
    virtual int get_lineno() const = 0;
    virtual std::string toString() const = 0;
    virtual void dbprint(std::ostream &out) const = 0;
};
class MatchSource : public IHasDbPrint {…};

class HashMatchSource : public MatchSource {
    int lo = 0;
    int hi = 0;
 
 public:
    int lineno = 0;
    HashMatchSource(int line, int l, int h) : lo(l), hi(h), lineno(line) {}
    explicit HashMatchSource(value_t value) {
        if (CHECKTYPE(value, tCMD)) {
            lineno = value.lineno;
            if (value != "hash_group")
                error(value.lineno, "Hash Match source must come from a hash group");
            if (value.vec.size != 2) error(value.lineno, "Hash Match source requires a range");
            if (CHECKTYPE(value.vec[1], tRANGE)) {
                lo = value.vec[1].range.lo;
                hi = value.vec[1].range.hi;
            }
        }
    }
 
    int get_lineno() const override { return lineno; }
    int fieldlobit() const override { return lo < 0 ? 0 : lo; }
    int fieldhibit() const override { return hi < 0 ? 0 : hi; }
    unsigned size() const override { return hi >= lo && lo >= 0 ? hi - lo + 1 : 0; }
    int slicelobit() const override { return fieldlobit(); }
    int slicehibit() const override { return fieldhibit(); }
    const char *name() const override { return "hash_group"; }
    std::string toString() const override {
        std::stringstream str;
        str << *this;
        return str.str();
    }
 
    void dbprint(std::ostream &out) const override {
        out << name() << "(" << lo << ".." << hi << ")";
    }
};
class HashMatchSource : public MatchSource {…};
 
#endif /* BACKENDS_TOFINO_BF_ASM_MATCH_SOURCE_H_ */