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Bug 499790 - common sub-expression elim for repeated (PND_ASSIGNED | PND_FUNARG), r=mrbkap.

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This commit is contained in:
Brendan Eich 2009-07-17 11:36:45 -07:00
parent 29e68cb007
commit c1bd7212b8
2 changed files with 8 additions and 5 deletions
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10
js/src/jsparse.cpp
View File

@ -1270,7 +1270,7 @@ Define(JSParseNode *pn, JSAtom *atom, JSTreeContext *tc, bool let = false)
while ((pnu = *pnup) != NULL && pnu->pn_blockid >= start) {
JS_ASSERT(pnu->pn_used);
pnu->pn_lexdef = (JSDefinition *) pn;
pn->pn_dflags |= pnu->pn_dflags & (PND_ASSIGNED | PND_FUNARG);
pn->pn_dflags |= pnu->pn_dflags & PND_USE2DEF_FLAGS;
pnup = &pnu->pn_link;
}
@ -1386,9 +1386,9 @@ MakeDefIntoUse(JSDefinition *dn, JSParseNode *pn, JSAtom *atom, JSTreeContext *t
JS_ASSERT(pnu->pn_used);
JS_ASSERT(!pnu->pn_defn);
pnu->pn_lexdef = (JSDefinition *) pn;
pn->pn_dflags |= pnu->pn_dflags & (PND_ASSIGNED | PND_FUNARG);
pn->pn_dflags |= pnu->pn_dflags & PND_USE2DEF_FLAGS;
}
pn->pn_dflags |= dn->pn_dflags & (PND_ASSIGNED | PND_FUNARG);
pn->pn_dflags |= dn->pn_dflags & PND_USE2DEF_FLAGS;
pn->dn_uses = dn;
dn->pn_defn = false;
@ -4335,7 +4335,7 @@ RebindLets(JSParseNode *pn, JSTreeContext *tc)
JSDefinition *dn = ALE_DEFN(ale);
dn->pn_type = TOK_NAME;
dn->pn_op = JSOP_NOP;
dn->pn_dflags |= pn->pn_dflags & (PND_ASSIGNED | PND_FUNARG);
dn->pn_dflags |= pn->pn_dflags & PND_USE2DEF_FLAGS;
}
LinkUseToDef(pn, ALE_DEFN(ale), tc);
}
@ -6403,7 +6403,7 @@ CompExprTransplanter::transplant(JSParseNode *pn)
JSParseNode *pnu;
while ((pnu = *pnup) != NULL && pnu->pn_pos >= root->pn_pos) {
pnu->pn_lexdef = dn2;
dn2->pn_dflags |= pnu->pn_dflags & (PND_ASSIGNED | PND_FUNARG);
dn2->pn_dflags |= pnu->pn_dflags & PND_USE2DEF_FLAGS;
pnup = &pnu->pn_link;
}
dn2->dn_uses = dn->dn_uses;

3
js/src/jsparse.h
View File

@ -418,6 +418,9 @@ struct JSParseNode {
#define PND_FUNARG 0x100 /* downward or upward funarg usage */
#define PND_BOUND 0x200 /* bound to a stack or global slot */
/* Flags to propagate from uses to definition. */
#define PND_USE2DEF_FLAGS (PND_ASSIGNED | PND_FUNARG)
/* PN_LIST pn_xflags bits. */
#define PNX_STRCAT 0x01 /* TOK_PLUS list has string term */
#define PNX_CANTFOLD 0x02 /* TOK_PLUS list has unfoldable term */