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pre-allocate h_desugar's result to squelch recursive calls

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This commit is contained in:
Sven M. Hallberg 2013-06-14 12:27:35 +02:00
parent 8618f9cb62
commit 7b04ab8d9d
3 changed files with 10 additions and 3 deletions
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7
src/backends/contextfree.h
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@ -11,6 +11,7 @@ struct HCFStack_ {
int count; int count;
int cap; int cap;
HCFChoice *last_completed; // Last completed choice. HCFChoice *last_completed; // Last completed choice.
HCFChoice *prealloc; // If not NULL, will serve as outermost choice.
}; };
#ifndef UNUSED #ifndef UNUSED
@ -25,11 +26,13 @@ static HCFStack* h_cfstack_new(HAllocator *mm__) {
stack->count = 0; stack->count = 0;
stack->cap = 4; stack->cap = 4;
stack->stack = h_new(HCFChoice*, stack->cap); stack->stack = h_new(HCFChoice*, stack->cap);
stack->prealloc = NULL;
return stack; return stack;
} }
static void h_cfstack_free(HAllocator *mm__, HCFStack *stk__) UNUSED; static void h_cfstack_free(HAllocator *mm__, HCFStack *stk__) UNUSED;
static void h_cfstack_free(HAllocator *mm__, HCFStack *stk__) { static void h_cfstack_free(HAllocator *mm__, HCFStack *stk__) {
h_free(stk__->prealloc);
h_free(stk__->stack); h_free(stk__->stack);
h_free(stk__); h_free(stk__);
} }
@ -56,7 +59,9 @@ static inline void h_cfstack_add_to_seq(HAllocator *mm__, HCFStack *stk__, HCFCh
} }
static inline HCFChoice* h_cfstack_new_choice_raw(HAllocator *mm__, HCFStack *stk__) { static inline HCFChoice* h_cfstack_new_choice_raw(HAllocator *mm__, HCFStack *stk__) {
HCFChoice *ret = h_new(HCFChoice, 1); HCFChoice *ret = stk__->prealloc? stk__->prealloc : h_new(HCFChoice, 1);
stk__->prealloc = NULL;
ret->reshape = NULL; ret->reshape = NULL;
ret->action = NULL; ret->action = NULL;
ret->pred = NULL; ret->pred = NULL;

4
src/desugar.c
View file

@ -8,9 +8,11 @@ HCFChoice *h_desugar(HAllocator *mm__, HCFStack *stk__, const HParser *parser) {
if (nstk__ == NULL) { if (nstk__ == NULL) {
nstk__ = h_cfstack_new(mm__); nstk__ = h_cfstack_new(mm__);
} }
if(nstk__->prealloc == NULL)
nstk__->prealloc = h_new(HCFChoice, 1);
// we're going to do something naughty and cast away the const to memoize // we're going to do something naughty and cast away the const to memoize
((HParser *)parser)->desugared = nstk__->prealloc;
parser->vtable->desugar(mm__, nstk__, parser->env); parser->vtable->desugar(mm__, nstk__, parser->env);
((HParser *)parser)->desugared = nstk__->last_completed;
if (stk__ == NULL) if (stk__ == NULL)
h_cfstack_free(mm__, nstk__); h_cfstack_free(mm__, nstk__);
} else if (stk__ != NULL) { } else if (stk__ != NULL) {