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eliminate the right stack; work with the HInputStream directly

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Sven M. Hallberg 2013-06-21 20:11:19 +02:00
parent 1e59e461fa
commit c32cf709b2
3 changed files with 54 additions and 60 deletions
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12
src/backends/lr.h
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@ -70,11 +70,8 @@ typedef struct HLREngine_ {
size_t state;
bool run;
// stack layout:
// on the left stack, we put pairs: (saved state, semantic value)
// on the right stack, we put pairs: (symbol, semantic value)
HSlist *left; // left stack; reductions happen here
HSlist *right; // right stack; input appears here
HSlist *stack; // holds pairs: (saved state, semantic value)
HInputStream input;
HArena *arena; // will hold the results
HArena *tarena; // tmp, deleted after parse
@ -108,7 +105,8 @@ HLRItem *h_lritem_new(HArena *a, HCFChoice *lhs, HCFChoice **rhs, size_t mark);
HLRState *h_lrstate_new(HArena *arena);
HLRTable *h_lrtable_new(HAllocator *mm__, size_t nrows);
void h_lrtable_free(HLRTable *table);
HLREngine *h_lrengine_new(HArena *arena, HArena *tarena, const HLRTable *table);
HLREngine *h_lrengine_new(HArena *arena, HArena *tarena, const HLRTable *table,
const HInputStream *stream);
HLRAction *h_reduce_action(HArena *arena, const HLRItem *item);
HLRAction *h_shift_action(HArena *arena, size_t nextstate);
HLRAction *h_lr_conflict(HArena *arena, HLRAction *action, HLRAction *new);
@ -128,7 +126,7 @@ int h_lalr_compile(HAllocator* mm__, HParser* parser, const void* params);
void h_lalr_free(HParser *parser);
const HLRAction *h_lr_lookup(const HLRTable *table, size_t state, const HCFChoice *symbol);
const HLRAction *h_lrengine_action(HLREngine *engine, HInputStream *stream);
const HLRAction *h_lrengine_action(const HLREngine *engine);
void h_lrengine_step(HLREngine *engine, const HLRAction *action);
HParseResult *h_lrengine_result(HLREngine *engine);
HParseResult *h_lr_parse(HAllocator* mm__, const HParser* parser, HInputStream* stream);