dwarfpubnames.c

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#include <precomp.h>
#define NDEBUG
#include <debug.h>

static int
_dwarfnametounit(Dwarf *d, char *name, DwarfBlock *bl, DwarfSym *s)
{
    int vers;
    ulong len, unit, off;
    uchar *next;
    char *str;
    DwarfBuf b;

    b.d = d;
    b.p = bl->data;
    b.ep = b.p + bl->len;

    while(b.p < b.ep){
        len = dwarfget4(&b);
        if(len > b.ep-b.p){
            werrstr("bad length in dwarf name header");
            return -1;
        }
        next = b.p + len;
        vers = dwarfget2(&b);
        if(vers != 1 && vers != 2){
            werrstr("bad version %d in dwarf name header", vers);
            return -1;
        }
        unit = dwarfget4(&b);
        dwarfget4(&b);  /* unit length */
        while(b.p < next){
            off = dwarfget4(&b);
            if(off == 0)
                break;
            str = dwarfgetstring(&b);
            if(strcmp(str, name) == 0){
                if(dwarfenumunit(d, unit, s) < 0)
                    return -1;
                if(unit + off >= s->b.ep - d->info.data){
                    werrstr("bad offset in name entry");
                    return -1;
                }
                s->b.p = d->info.data + unit + off;
                if(dwarfnextsym(d, s) < 0)
                    return -1;
                if(s->attrs.name==nil || strcmp(s->attrs.name, name)!=0){
                    werrstr("unexpected name %#q in lookup for %#q", s->attrs.name, name);
                    return -1;
                }
                return 0;
            }
        }
        b.p = next;
    }
    werrstr("unknown name '%s'", name);
    return -1;
}

int
dwarflookupname(Dwarf *d, char *name, DwarfSym *sym)
{
    return _dwarfnametounit(d, name, &d->pubnames, sym);
}

/*

int
dwarflookuptype(Dwarf *d, char *name, DwarfSym *sym)
{
    return _dwarfnametounit(d, name, &d->pubtypes, sym);
}

 */