mirror of
https://github.com/reactos/reactos.git
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137 lines
3.2 KiB
C
137 lines
3.2 KiB
C
/*
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* Dwarf abbreviation parsing code.
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*
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* The convention here is that calling dwarfgetabbrevs relinquishes
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* access to any abbrevs returned previously. Will have to add
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* explicit reference counting if this turns out not to be acceptable.
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*/
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#include <precomp.h>
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#define NDEBUG
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#include <debug.h>
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static int parseabbrevs(Dwarf*, ulong, DwarfAbbrev*, DwarfAttr*, int*, int*);
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DwarfAbbrev *dwarfgetabbrev(Dwarf*, ulong, ulong);
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static int
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loadabbrevs(Dwarf *d, ulong off, DwarfAbbrev **aa)
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{
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int nattr, nabbrev;
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DwarfAbbrev *abbrev;
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DwarfAttr *attr;
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if(d->acache.off == off && d->acache.na){
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*aa = d->acache.a;
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return d->acache.na;
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}
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/* two passes - once to count, then allocate, then a second to copy */
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if(parseabbrevs(d, off, nil, nil, &nabbrev, &nattr) < 0) {
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return -1;
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}
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abbrev = malloc(nabbrev*sizeof(DwarfAbbrev) + nattr*sizeof(DwarfAttr));
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attr = (DwarfAttr*)(abbrev+nabbrev);
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if(parseabbrevs(d, off, abbrev, attr, nil, nil) < 0){
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free(abbrev);
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return -1;
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}
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free(d->acache.a);
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d->acache.a = abbrev;
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d->acache.na = nabbrev;
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d->acache.off = off;
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*aa = abbrev;
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return nabbrev;
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}
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static int
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parseabbrevs(Dwarf *d, ulong off, DwarfAbbrev *abbrev, DwarfAttr *attr, int *pnabbrev, int *pnattr)
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{
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int i, nabbrev, nattr, haskids;
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ulong num, tag, name, form;
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DwarfBuf b;
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if(off >= d->abbrev.len){
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werrstr("bad abbrev section offset 0x%lux >= 0x%lux", off, d->abbrev.len);
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return -1;
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}
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memset(&b, 0, sizeof b);
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b.p = d->abbrev.data + off;
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b.ep = d->abbrev.data + d->abbrev.len;
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nabbrev = 0;
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nattr = 0;
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for(;;){
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if(b.p == nil){
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werrstr("malformed abbrev data");
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return -1;
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}
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num = dwarfget128(&b);
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if(num == 0)
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break;
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tag = dwarfget128(&b);
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werrstr("abbrev: num %d tag %x @ %x", num, tag, b.p - d->abbrev.data);
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haskids = dwarfget1(&b);
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for(i=0;; i++){
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name = dwarfget128(&b);
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form = dwarfget128(&b);
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assert(form < 0x3000);
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if(name == 0 && form == 0)
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break;
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if(attr){
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attr[i].name = name;
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attr[i].form = form;
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}
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}
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if(abbrev){
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abbrev->num = num;
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abbrev->tag = tag;
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abbrev->haskids = haskids;
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abbrev->attr = attr;
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abbrev->nattr = i;
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abbrev++;
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attr += i;
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}
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nabbrev++;
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nattr += i;
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}
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if(pnabbrev)
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*pnabbrev = nabbrev;
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if(pnattr)
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*pnattr = nattr;
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return 0;
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}
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static DwarfAbbrev*
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findabbrev(DwarfAbbrev *a, int na, ulong num)
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{
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int i;
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for(i=0; i<na; i++) {
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if(a[i].num == num) {
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return &a[i];
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}
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}
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werrstr("abbrev not found (%x)", na);
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return nil;
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}
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DwarfAbbrev*
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dwarfgetabbrev(Dwarf *d, ulong off, ulong num)
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{
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DwarfAbbrev *a;
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int na;
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werrstr("want num %d\n", num);
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if((na = loadabbrevs(d, off, &a)) < 0){
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werrstr("loadabbrevs: %r");
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return nil;
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}
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return findabbrev(a, na, num);
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}
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