common/asm_output.h

 
#ifndef BF_P4C_COMMON_ASM_OUTPUT_H_
#define BF_P4C_COMMON_ASM_OUTPUT_H_
 
#include <map>
 
#include "backends/tofino/bf-p4c/bf-p4c-options.h"
#include "backends/tofino/bf-p4c/ir/bitrange.h"
#include "backends/tofino/bf-p4c/phv/phv_fields.h"
#include "lib/ordered_map.h"
#include "lib/safe_vector.h"
#include "lib/stringref.h"
 
using namespace P4;
 
StringRef trim_asm_name(StringRef name);
 
class canon_name {
    StringRef name;
    friend std::ostream &operator<<(std::ostream &, canon_name);
 
 public:
    explicit canon_name(StringRef n) : name(n) {}
    explicit canon_name(cstring n) : name(n) {}
    explicit canon_name(IR::ID n) : name(n.name) {}
 
    operator cstring() const { return cstring::to_cstring(*this); }
};
 
class Slice {
    const PHV::Field *field;
    PHV::Container reg;
    int lo, hi;
    friend std::ostream &operator<<(std::ostream &, const Slice &);
    Slice &invalidate() {
        field = 0;
        reg = PHV::Container();
        lo = -1;
        hi = -2;
        return *this;
    }
 
 public:
    Slice() : field(0), lo(-1), hi(-2) {}  // hi = -2 to make width() = 0
    explicit Slice(const PHV::Field *f) : field(f), lo(0), hi(f->size - 1) {}
    Slice(const PHV::Field *f, int bit) : field(f), lo(bit), hi(bit) {}
    Slice(const PHV::Field *f, int l, int h) : field(f), lo(l), hi(h) {}
    Slice(const PHV::Field *f, le_bitrange r) : field(f), lo(r.lo), hi(r.hi) {}
    explicit Slice(const PHV::AbstractField *f)
        : field(f->field()), lo(f->range().lo), hi(f->range().hi) {}
    Slice(const PHV::AbstractField *f, int l, int h)
        : field(f->field()), lo(f->range().lo + l), hi(f->range().lo + h) {
        if (hi > f->range().hi) hi = f->range().hi;
        if (!field || lo > hi) invalidate();
    }
    Slice(const PHV::AbstractField *f, le_bitrange r) : Slice(f, r.lo, r.hi) {}
    Slice(const PHV::AbstractField *f, int bit) : Slice(f, bit, bit) {}
    Slice(const PhvInfo &phv, const IR::Expression *e) {
        le_bitrange bits;
        if (!(field = phv.field(e, &bits))) {
            invalidate();
        } else {
            lo = bits.lo;
            hi = bits.hi;
        }
    }
    Slice(const PhvInfo &phv, const IR::Expression *e, int l, int h) {
        le_bitrange bits;
        if (!(field = phv.field(e, &bits))) {
            invalidate();
        } else {
            lo = bits.lo + l;
            hi = bits.lo + h;
            if (hi > bits.hi) hi = bits.hi;
            if (lo > hi) invalidate();
        }
    }
    Slice(const PhvInfo &phv, const IR::Expression *e, le_bitrange r) : Slice(phv, e, r.lo, r.hi) {}
    Slice(const PhvInfo &phv, const IR::Expression *e, int bit) : Slice(phv, e, bit, bit) {}
    Slice(const PhvInfo &phv, cstring n) : field(phv.field(n)), lo(0), hi(field->size - 1) {}
    Slice(const PhvInfo &phv, cstring n, int bit) : field(phv.field(n)), lo(bit), hi(bit) {
        BUG_CHECK((bit >= 0 && bit < field->size),
                  "Slice out of range for field = '%s', bit=%d, size=%d", field->name, bit,
                  field->size);
    }
    Slice(const PhvInfo &phv, cstring n, int l, int h) : field(phv.field(n)), lo(l), hi(h) {
        BUG_CHECK((lo < field->size), "Slice out of range for field = '%s', lo=%d, size=%d",
                  field->name, lo, field->size);
        if (lo < 0) lo = 0;
        if (hi >= field->size) hi = field->size - 1;
    }
    explicit Slice(PHV::Container r) : field(0), reg(r), lo(0), hi(r.size() - 1) {}
    Slice(PHV::Container r, int bit) : field(0), reg(r), lo(bit), hi(bit) {}
    Slice(PHV::Container r, int lo, int hi) : field(0), reg(r), lo(lo), hi(hi) {}
    Slice(const Slice &s, int bit) : field(s.field), reg(s.reg), lo(s.lo + bit), hi(lo) {}
    Slice(const Slice &s, int l, int h) : field(s.field), reg(s.reg), lo(s.lo + l), hi(s.lo + h) {
        if (hi > s.hi) hi = s.hi;
        if (!field || lo > hi) invalidate();
    }
    explicit operator bool() const { return field != nullptr || reg; }
    Slice operator()(int bit) const { return Slice(*this, bit); }
    Slice operator()(int l, int h) const { return Slice(*this, l, h); }
    Slice join(Slice &a) const;
    Slice &operator-=(const Slice &a) {
        if (field != a.field || reg != a.reg || hi < a.lo || lo > a.hi) return *this;
        if (a.lo <= lo) lo = a.hi + 1;
        if (a.hi >= hi) hi = a.lo - 1;
        if (lo > hi) invalidate();
        return *this;
    }
    Slice &operator-=(const std::vector<Slice> &a) {
        for (auto &v : a) *this -= v;
        return *this;
    }
    Slice operator-(const Slice &a) const {
        auto tmp = *this;
        tmp -= a;
        return tmp;
    }
    Slice operator-(const std::vector<Slice> &a) const {
        auto tmp = *this;
        tmp -= a;
        return tmp;
    }
    Slice &operator&=(const Slice &a) {
        if (field != a.field || reg != a.reg) return invalidate();
        if (a.lo > lo) lo = a.lo;
        if (a.hi < hi) hi = a.hi;
        if (lo > hi) invalidate();
        return *this;
    }
    Slice operator&(const Slice &a) const {
        auto tmp = *this;
        tmp &= a;
        return tmp;
    }
    safe_vector<Slice> split(const Slice &a, bool &split);
    safe_vector<Slice> split(const safe_vector<Slice> &vec, safe_vector<Slice> &splitters);
    int width() const { return hi - lo + 1; }
    int align(int size) const;
    int bytealign() const { return align(8); }
    Slice fullbyte() const;
    const PHV::Field *get_field() const { return field; }
    const PHV::Container get_container() const { return reg; }
    int get_lo() const { return lo; }
    int get_hi() const { return hi; }
    void shrink_lo(int shrink) {
        if (shrink + lo >= hi)
            lo = hi;
        else
            lo += shrink;
    }
    le_bitrange range() const { return {lo, hi}; }
    void shrink_hi(int shrink) {
        if (hi - shrink <= lo)
            hi = lo;
        else
            hi -= shrink;
    }
};
 
/* The rest of this is pretty generic formatting stuff -- should be in lib somewhere? */
 
template <class K, class V>
std::ostream &operator<<(std::ostream &out, const std::map<K, V> &m) {
    const char *sep = " ";
    out << "{";
    for (const auto &kv : m) {
        out << sep << kv.first << ": " << kv.second;
        sep = ", ";
    }
    out << (sep + 1) << "}";
    return out;
}
 
template <class K, class V>
std::ostream &operator<<(std::ostream &out, const std::multimap<K, V> &m) {
    const char *sep = " ";
    out << "{";
    for (const auto &kv : m) {
        out << sep << kv.first << ": " << kv.second;
        sep = ", ";
    }
    out << (sep + 1) << "}";
    return out;
}
 
template <class K, class V>
std::ostream &operator<<(std::ostream &out, const ordered_map<K, V> &m) {
    const char *sep = " ";
    out << "{";
    for (const auto &kv : m) {
        out << sep << kv.first << ": " << kv.second;
        sep = ", ";
    }
    out << "}";
    return out;
}
 
template <class VEC>
struct emit_vector_formatter {
    const VEC &vec;
    const char *sep;
};
 
template <class VEC>
std::ostream &operator<<(std::ostream &out, const emit_vector_formatter<VEC> &v) {
    const char *sep = "";
    for (const auto &el : v.vec) {
        out << sep << el;
        sep = v.sep;
    }
    return out;
}
 
template <class VEC>
emit_vector_formatter<VEC> emit_vector(const VEC &v, const char *sep = ", ") {
    return emit_vector_formatter<VEC>{v, sep};
}
 
bool has_user_annotation(const IR::IAnnotated *node);
 
void emit_user_annotation_context_json(std::ostream &out, indent_t indent,
                                       const IR::IAnnotated *node, bool emit_dash = false);
 
void emit_user_annotation_context_json(indent_t indent, const IR::IAnnotated *node,
                                       std::stringstream &context_json_entries);
 
template <class T>
inline auto operator<<(std::ostream &out, const T &obj) -> decltype((void)obj.print(out), out) {
    obj.print(out);
    return out;
}
 
template <class T>
inline auto operator<<(std::ostream &out, const T *obj) -> decltype((void)obj->print(out), out) {
    if (obj)
        obj->print(out);
    else
        out << "<null>";
    return out;
}
 
#endif /* BF_P4C_COMMON_ASM_OUTPUT_H_ */