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Handle attached identifier labels correctly.

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I'd forgotten I had the prev field. Makes for much cleaner code.
This commit is contained in:
Bill Currie 2012-07-19 09:27:42 +09:00
parent 0cedf0d13a
commit 0ccf4093e4
2 changed files with 27 additions and 14 deletions
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3
tools/qfcc/include/dags.h
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@ -36,8 +36,11 @@
//@{
typedef struct daglabel_s {
/// \name attached identifer linked list
//@{
struct daglabel_s *next;
struct daglabel_s **prev;
//@}
const char *opcode; ///< not if op
struct operand_s *op; ///< not if opcode;
struct dagnode_s *dagnode; ///< node with which this label is associated

38
tools/qfcc/source/dags.c
View file

@ -221,6 +221,26 @@ dagnode_match (const dagnode_t *n, const daglabel_t *op,
return 1;
}
static void
dagnode_attach_label (dagnode_t *n, daglabel_t *l)
{
if (n->identifiers)
n->identifiers->prev = &l->next;
l->next = n->identifiers;
l->prev = &n->identifiers;
l->dagnode = n;
n->identifiers = l;
}
static void
daglabel_detatch (daglabel_t *l)
{
if (l->next)
l->next->prev = l->prev;
*l->prev = l->next;
l->dagnode = 0;
}
dagnode_t *
make_dag (const sblock_t *block)
{
@ -230,7 +250,7 @@ make_dag (const sblock_t *block)
for (s = block->statements; s; s = s->next) {
operand_t *x = 0, *y = 0, *z = 0, *w = 0;
dagnode_t *n = 0, *nx, *ny, *nz, *nw;
dagnode_t *n = 0, *ny, *nz, *nw;
daglabel_t *op, *lx;
int simp;
@ -259,20 +279,10 @@ make_dag (const sblock_t *block)
dagnodes = n;
}
lx = operand_label (x);
if ((nx = node (x))) {
daglabel_t **l;
for (l = &nx->identifiers; *l; l = &(*l)->next) {
if (*l == lx) {
*l = (*l)->next;
lx->next = 0;
break;
}
}
}
if (lx) {
lx->next = n->identifiers;
n->identifiers = lx;
lx->dagnode = n;
if (lx->prev)
daglabel_detatch (lx);
dagnode_attach_label (n, lx);
}
dag = n;
// c = a * b