diff options
Diffstat (limited to 'gcc/basic-block.h')
| -rw-r--r-- | gcc/basic-block.h | 129 |
1 files changed, 116 insertions, 13 deletions
diff --git a/gcc/basic-block.h b/gcc/basic-block.h index 978f313..04ddee0 100644 --- a/gcc/basic-block.h +++ b/gcc/basic-block.h @@ -28,6 +28,8 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA #include "partition.h" #include "hard-reg-set.h" #include "predict.h" +#include "vec.h" +#include "errors.h" /* Head of register set linked list. */ typedef bitmap_head regset_head; @@ -147,12 +149,8 @@ do { \ typedef HOST_WIDEST_INT gcov_type; /* Control flow edge information. */ -struct edge_def GTY((chain_next ("%h.pred_next"))) +struct edge_def GTY(()) { - /* Links through the predecessor and successor lists. */ - struct edge_def *pred_next; - struct edge_def *succ_next; - /* The two blocks at the ends of the edge. */ struct basic_block_def *src; struct basic_block_def *dest; @@ -176,6 +174,7 @@ struct edge_def GTY((chain_next ("%h.pred_next"))) }; typedef struct edge_def *edge; +DEF_VEC_GC_P(edge); #define EDGE_FALLTHRU 1 /* 'Straight line' flow */ #define EDGE_ABNORMAL 2 /* Strange flow, like computed @@ -250,8 +249,8 @@ struct basic_block_def GTY((chain_next ("%h.next_bb"), chain_prev ("%h.prev_bb") tree stmt_list; /* The edges into and out of the block. */ - edge pred; - edge succ; + VEC(edge) *preds; + VEC(edge) *succs; /* Liveness info. */ @@ -539,12 +538,12 @@ struct edge_list #define NUM_EDGES(el) ((el)->num_edges) /* BB is assumed to contain conditional jump. Return the fallthru edge. */ -#define FALLTHRU_EDGE(bb) ((bb)->succ->flags & EDGE_FALLTHRU \ - ? (bb)->succ : (bb)->succ->succ_next) +#define FALLTHRU_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ + ? EDGE_SUCC ((bb), 0) : EDGE_SUCC ((bb), 1)) /* BB is assumed to contain conditional jump. Return the branch edge. */ -#define BRANCH_EDGE(bb) ((bb)->succ->flags & EDGE_FALLTHRU \ - ? (bb)->succ->succ_next : (bb)->succ) +#define BRANCH_EDGE(bb) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ + ? EDGE_SUCC ((bb), 1) : EDGE_SUCC ((bb), 0)) /* Return expected execution frequency of the edge E. */ #define EDGE_FREQUENCY(e) (((e)->src->frequency \ @@ -553,8 +552,112 @@ struct edge_list / REG_BR_PROB_BASE) /* Return nonzero if edge is critical. */ -#define EDGE_CRITICAL_P(e) ((e)->src->succ->succ_next \ - && (e)->dest->pred->pred_next) +#define EDGE_CRITICAL_P(e) (EDGE_COUNT ((e)->src->succs) >= 2 \ + && EDGE_COUNT ((e)->dest->preds) >= 2) + +#define EDGE_COUNT(ev) VEC_length (edge, (ev)) +#define EDGE_I(ev,i) VEC_index (edge, (ev), (i)) +#define EDGE_PRED(bb,i) VEC_index (edge, (bb)->preds, (i)) +#define EDGE_SUCC(bb,i) VEC_index (edge, (bb)->succs, (i)) + +/* Iterator object for edges. */ + +typedef struct { + unsigned index; + VEC(edge) *container; +} edge_iterator; + +/* Return an iterator pointing to the start of an edge vector. */ +static inline edge_iterator +ei_start (VEC(edge) *ev) +{ + edge_iterator i; + + i.index = 0; + i.container = ev; + + return i; +} + +/* Return an iterator pointing to the last element of an edge + vector. */ +static inline edge_iterator +ei_last (VEC(edge) *ev) +{ + edge_iterator i; + + i.index = EDGE_COUNT (ev) - 1; + i.container = ev; + + return i; +} + +/* Is the iterator `i' at the end of the sequence? */ +static inline bool +ei_end_p (edge_iterator i) +{ + return (i.index == EDGE_COUNT (i.container)); +} + +/* Is the iterator `i' at one position before the end of the + sequence? */ +static inline bool +ei_one_before_end_p (edge_iterator i) +{ + return (i.index + 1 == EDGE_COUNT (i.container)); +} + +/* Advance the iterator to the next element. */ +static inline void +ei_next (edge_iterator *i) +{ + gcc_assert (i->index < EDGE_COUNT (i->container)); + i->index++; +} + +/* Move the iterator to the previous element. */ +static inline void +ei_prev (edge_iterator *i) +{ + gcc_assert (i->index > 0); + i->index--; +} + +/* Return the edge pointed to by the iterator `i'. */ +static inline edge +ei_edge (edge_iterator i) +{ + return EDGE_I (i.container, i.index); +} + +/* Return an edge pointed to by the iterator. Do it safely so that + NULL is returned when the iterator is pointing at the end of the + sequence. */ +static inline edge +ei_safe_edge (edge_iterator i) +{ + return !ei_end_p (i) ? ei_edge (i) : NULL; +} + +/* This macro serves as a convenient way to iterate each edge in a + vector of predeccesor or successor edges. It must not be used when + an element might be removed during the traversal, otherwise + elements will be missed. Instead, use a for-loop like that shown + in the following pseudo-code: + + FOR (ei = ei_start (bb->succs); (e = ei_safe_edge (ei)); ) + { + IF (e != taken_edge) + ssa_remove_edge (e); + ELSE + ei_next (&ei); + } +*/ + +#define FOR_EACH_EDGE(EDGE,ITER,EDGE_VEC) \ + for ((EDGE) = NULL, (ITER) = ei_start ((EDGE_VEC)); \ + ((EDGE) = ei_safe_edge ((ITER))); \ + ei_next (&(ITER))) struct edge_list * create_edge_list (void); void free_edge_list (struct edge_list *); |