diff options
Diffstat (limited to 'gcc-4.9/gcc/basic-block.h')
| -rw-r--r-- | gcc-4.9/gcc/basic-block.h | 1006 |
1 files changed, 1006 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/basic-block.h b/gcc-4.9/gcc/basic-block.h new file mode 100644 index 000000000..82729b4c8 --- /dev/null +++ b/gcc-4.9/gcc/basic-block.h @@ -0,0 +1,1006 @@ +/* Define control flow data structures for the CFG. + Copyright (C) 1987-2014 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 3, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + +#ifndef GCC_BASIC_BLOCK_H +#define GCC_BASIC_BLOCK_H + +#include "predict.h" +#include "vec.h" +#include "function.h" + +/* Use gcov_type to hold basic block counters. Should be at least + 64bit. Although a counter cannot be negative, we use a signed + type, because erroneous negative counts can be generated when the + flow graph is manipulated by various optimizations. A signed type + makes those easy to detect. */ + +/* Control flow edge information. */ +struct GTY((user)) edge_def { + /* The two blocks at the ends of the edge. */ + basic_block src; + basic_block dest; + + /* Instructions queued on the edge. */ + union edge_def_insns { + gimple_seq g; + rtx r; + } insns; + + /* Auxiliary info specific to a pass. */ + PTR aux; + + /* Location of any goto implicit in the edge. */ + location_t goto_locus; + + /* The index number corresponding to this edge in the edge vector + dest->preds. */ + unsigned int dest_idx; + + int flags; /* see cfg-flags.def */ + int probability; /* biased by REG_BR_PROB_BASE */ + gcov_type count; /* Expected number of executions calculated + in profile.c */ +}; + + +/* Garbage collection and PCH support for edge_def. */ +extern void gt_ggc_mx (edge_def *e); +extern void gt_pch_nx (edge_def *e); +extern void gt_pch_nx (edge_def *e, gt_pointer_operator, void *); + +/* Masks for edge.flags. */ +#define DEF_EDGE_FLAG(NAME,IDX) EDGE_##NAME = 1 << IDX , +enum cfg_edge_flags { +#include "cfg-flags.def" + LAST_CFG_EDGE_FLAG /* this is only used for EDGE_ALL_FLAGS */ +}; +#undef DEF_EDGE_FLAG + +/* Bit mask for all edge flags. */ +#define EDGE_ALL_FLAGS ((LAST_CFG_EDGE_FLAG - 1) * 2 - 1) + +/* The following four flags all indicate something special about an edge. + Test the edge flags on EDGE_COMPLEX to detect all forms of "strange" + control flow transfers. */ +#define EDGE_COMPLEX \ + (EDGE_ABNORMAL | EDGE_ABNORMAL_CALL | EDGE_EH | EDGE_PRESERVE) + +/* Counter summary from the last set of coverage counts read by + profile.c. */ +extern const struct gcov_ctr_summary *profile_info; + +/* Structure to gather statistic about profile consistency, per pass. + An array of this structure, indexed by pass static number, is allocated + in passes.c. The structure is defined here so that different CFG modes + can do their book-keeping via CFG hooks. + + For every field[2], field[0] is the count before the pass runs, and + field[1] is the post-pass count. This allows us to monitor the effect + of each individual pass on the profile consistency. + + This structure is not supposed to be used by anything other than passes.c + and one CFG hook per CFG mode. */ +struct profile_record +{ + /* The number of basic blocks where sum(freq) of the block's predecessors + doesn't match reasonably well with the incoming frequency. */ + int num_mismatched_freq_in[2]; + /* Likewise for a basic block's successors. */ + int num_mismatched_freq_out[2]; + /* The number of basic blocks where sum(count) of the block's predecessors + doesn't match reasonably well with the incoming frequency. */ + int num_mismatched_count_in[2]; + /* Likewise for a basic block's successors. */ + int num_mismatched_count_out[2]; + /* A weighted cost of the run-time of the function body. */ + gcov_type time[2]; + /* A weighted cost of the size of the function body. */ + int size[2]; + /* True iff this pass actually was run. */ + bool run; +}; + +/* Declared in cfgloop.h. */ +struct loop; + +struct GTY(()) rtl_bb_info { + /* The first insn of the block is embedded into bb->il.x. */ + /* The last insn of the block. */ + rtx end_; + + /* In CFGlayout mode points to insn notes/jumptables to be placed just before + and after the block. */ + rtx header_; + rtx footer_; +}; + +struct GTY(()) gimple_bb_info { + /* Sequence of statements in this block. */ + gimple_seq seq; + + /* PHI nodes for this block. */ + gimple_seq phi_nodes; +}; + +/* A basic block is a sequence of instructions with only one entry and + only one exit. If any one of the instructions are executed, they + will all be executed, and in sequence from first to last. + + There may be COND_EXEC instructions in the basic block. The + COND_EXEC *instructions* will be executed -- but if the condition + is false the conditionally executed *expressions* will of course + not be executed. We don't consider the conditionally executed + expression (which might have side-effects) to be in a separate + basic block because the program counter will always be at the same + location after the COND_EXEC instruction, regardless of whether the + condition is true or not. + + Basic blocks need not start with a label nor end with a jump insn. + For example, a previous basic block may just "conditionally fall" + into the succeeding basic block, and the last basic block need not + end with a jump insn. Block 0 is a descendant of the entry block. + + A basic block beginning with two labels cannot have notes between + the labels. + + Data for jump tables are stored in jump_insns that occur in no + basic block even though these insns can follow or precede insns in + basic blocks. */ + +/* Basic block information indexed by block number. */ +struct GTY((chain_next ("%h.next_bb"), chain_prev ("%h.prev_bb"))) basic_block_def { + /* The edges into and out of the block. */ + vec<edge, va_gc> *preds; + vec<edge, va_gc> *succs; + + /* Auxiliary info specific to a pass. */ + PTR GTY ((skip (""))) aux; + + /* Innermost loop containing the block. */ + struct loop *loop_father; + + /* The dominance and postdominance information node. */ + struct et_node * GTY ((skip (""))) dom[2]; + + /* Previous and next blocks in the chain. */ + basic_block prev_bb; + basic_block next_bb; + + union basic_block_il_dependent { + struct gimple_bb_info GTY ((tag ("0"))) gimple; + struct { + rtx head_; + struct rtl_bb_info * rtl; + } GTY ((tag ("1"))) x; + } GTY ((desc ("((%1.flags & BB_RTL) != 0)"))) il; + + /* Various flags. See cfg-flags.def. */ + int flags; + + /* The index of this block. */ + int index; + + /* Expected number of executions: calculated in profile.c. */ + gcov_type count; + + /* Expected frequency. Normalized to be in range 0 to BB_FREQ_MAX. */ + int frequency; + + /* The discriminator for this block. The discriminator distinguishes + among several basic blocks that share a common locus, allowing for + more accurate sample-based profiling. */ + int discriminator; +}; + +/* This ensures that struct gimple_bb_info is smaller than + struct rtl_bb_info, so that inlining the former into basic_block_def + is the better choice. */ +typedef int __assert_gimple_bb_smaller_rtl_bb + [(int) sizeof (struct rtl_bb_info) + - (int) sizeof (struct gimple_bb_info)]; + + +#define BB_FREQ_MAX 10000 + +/* Masks for basic_block.flags. */ +#define DEF_BASIC_BLOCK_FLAG(NAME,IDX) BB_##NAME = 1 << IDX , +enum cfg_bb_flags +{ +#include "cfg-flags.def" + LAST_CFG_BB_FLAG /* this is only used for BB_ALL_FLAGS */ +}; +#undef DEF_BASIC_BLOCK_FLAG + +/* Bit mask for all basic block flags. */ +#define BB_ALL_FLAGS ((LAST_CFG_BB_FLAG - 1) * 2 - 1) + +/* Bit mask for all basic block flags that must be preserved. These are + the bit masks that are *not* cleared by clear_bb_flags. */ +#define BB_FLAGS_TO_PRESERVE \ + (BB_DISABLE_SCHEDULE | BB_RTL | BB_NON_LOCAL_GOTO_TARGET \ + | BB_HOT_PARTITION | BB_COLD_PARTITION) + +/* Dummy bitmask for convenience in the hot/cold partitioning code. */ +#define BB_UNPARTITIONED 0 + +/* Partitions, to be used when partitioning hot and cold basic blocks into + separate sections. */ +#define BB_PARTITION(bb) ((bb)->flags & (BB_HOT_PARTITION|BB_COLD_PARTITION)) +#define BB_SET_PARTITION(bb, part) do { \ + basic_block bb_ = (bb); \ + bb_->flags = ((bb_->flags & ~(BB_HOT_PARTITION|BB_COLD_PARTITION)) \ + | (part)); \ +} while (0) + +#define BB_COPY_PARTITION(dstbb, srcbb) \ + BB_SET_PARTITION (dstbb, BB_PARTITION (srcbb)) + +/* State of dominance information. */ + +enum dom_state +{ + DOM_NONE, /* Not computed at all. */ + DOM_NO_FAST_QUERY, /* The data is OK, but the fast query data are not usable. */ + DOM_OK /* Everything is ok. */ +}; + +/* What sort of profiling information we have. */ +enum profile_status_d +{ + PROFILE_ABSENT, + PROFILE_GUESSED, + PROFILE_READ, + PROFILE_LAST /* Last value, used by profile streaming. */ +}; + +/* A structure to group all the per-function control flow graph data. + The x_* prefixing is necessary because otherwise references to the + fields of this struct are interpreted as the defines for backward + source compatibility following the definition of this struct. */ +struct GTY(()) control_flow_graph { + /* Block pointers for the exit and entry of a function. + These are always the head and tail of the basic block list. */ + basic_block x_entry_block_ptr; + basic_block x_exit_block_ptr; + + /* Index by basic block number, get basic block struct info. */ + vec<basic_block, va_gc> *x_basic_block_info; + + /* Number of basic blocks in this flow graph. */ + int x_n_basic_blocks; + + /* Number of edges in this flow graph. */ + int x_n_edges; + + /* The first free basic block number. */ + int x_last_basic_block; + + /* UIDs for LABEL_DECLs. */ + int last_label_uid; + + /* Mapping of labels to their associated blocks. At present + only used for the gimple CFG. */ + vec<basic_block, va_gc> *x_label_to_block_map; + + enum profile_status_d x_profile_status; + + /* Whether the dominators and the postdominators are available. */ + enum dom_state x_dom_computed[2]; + + /* Number of basic blocks in the dominance tree. */ + unsigned x_n_bbs_in_dom_tree[2]; + + /* Maximal number of entities in the single jumptable. Used to estimate + final flowgraph size. */ + int max_jumptable_ents; +}; + +/* Defines for accessing the fields of the CFG structure for function FN. */ +#define ENTRY_BLOCK_PTR_FOR_FN(FN) ((FN)->cfg->x_entry_block_ptr) +#define EXIT_BLOCK_PTR_FOR_FN(FN) ((FN)->cfg->x_exit_block_ptr) +#define basic_block_info_for_fn(FN) ((FN)->cfg->x_basic_block_info) +#define n_basic_blocks_for_fn(FN) ((FN)->cfg->x_n_basic_blocks) +#define n_edges_for_fn(FN) ((FN)->cfg->x_n_edges) +#define last_basic_block_for_fn(FN) ((FN)->cfg->x_last_basic_block) +#define label_to_block_map_for_fn(FN) ((FN)->cfg->x_label_to_block_map) +#define profile_status_for_fn(FN) ((FN)->cfg->x_profile_status) + +#define BASIC_BLOCK_FOR_FN(FN,N) \ + ((*basic_block_info_for_fn (FN))[(N)]) +#define SET_BASIC_BLOCK_FOR_FN(FN,N,BB) \ + ((*basic_block_info_for_fn (FN))[(N)] = (BB)) + +/* For iterating over basic blocks. */ +#define FOR_BB_BETWEEN(BB, FROM, TO, DIR) \ + for (BB = FROM; BB != TO; BB = BB->DIR) + +#define FOR_EACH_BB_FN(BB, FN) \ + FOR_BB_BETWEEN (BB, (FN)->cfg->x_entry_block_ptr->next_bb, (FN)->cfg->x_exit_block_ptr, next_bb) + +#define FOR_EACH_BB_REVERSE_FN(BB, FN) \ + FOR_BB_BETWEEN (BB, (FN)->cfg->x_exit_block_ptr->prev_bb, (FN)->cfg->x_entry_block_ptr, prev_bb) + +/* For iterating over insns in basic block. */ +#define FOR_BB_INSNS(BB, INSN) \ + for ((INSN) = BB_HEAD (BB); \ + (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ + (INSN) = NEXT_INSN (INSN)) + +/* For iterating over insns in basic block when we might remove the + current insn. */ +#define FOR_BB_INSNS_SAFE(BB, INSN, CURR) \ + for ((INSN) = BB_HEAD (BB), (CURR) = (INSN) ? NEXT_INSN ((INSN)): NULL; \ + (INSN) && (INSN) != NEXT_INSN (BB_END (BB)); \ + (INSN) = (CURR), (CURR) = (INSN) ? NEXT_INSN ((INSN)) : NULL) + +#define FOR_BB_INSNS_REVERSE(BB, INSN) \ + for ((INSN) = BB_END (BB); \ + (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ + (INSN) = PREV_INSN (INSN)) + +#define FOR_BB_INSNS_REVERSE_SAFE(BB, INSN, CURR) \ + for ((INSN) = BB_END (BB),(CURR) = (INSN) ? PREV_INSN ((INSN)) : NULL; \ + (INSN) && (INSN) != PREV_INSN (BB_HEAD (BB)); \ + (INSN) = (CURR), (CURR) = (INSN) ? PREV_INSN ((INSN)) : NULL) + +/* Cycles through _all_ basic blocks, even the fake ones (entry and + exit block). */ + +#define FOR_ALL_BB_FN(BB, FN) \ + for (BB = ENTRY_BLOCK_PTR_FOR_FN (FN); BB; BB = BB->next_bb) + + +/* Stuff for recording basic block info. */ + +#define BB_HEAD(B) (B)->il.x.head_ +#define BB_END(B) (B)->il.x.rtl->end_ +#define BB_HEADER(B) (B)->il.x.rtl->header_ +#define BB_FOOTER(B) (B)->il.x.rtl->footer_ + +/* Special block numbers [markers] for entry and exit. + Neither of them is supposed to hold actual statements. */ +#define ENTRY_BLOCK (0) +#define EXIT_BLOCK (1) + +/* The two blocks that are always in the cfg. */ +#define NUM_FIXED_BLOCKS (2) + +#define set_block_for_insn(INSN, BB) (BLOCK_FOR_INSN (INSN) = BB) + +extern void compute_bb_for_insn (void); +extern unsigned int free_bb_for_insn (void); +extern void update_bb_for_insn (basic_block); + +extern void insert_insn_on_edge (rtx, edge); +basic_block split_edge_and_insert (edge, rtx); + +extern void commit_one_edge_insertion (edge e); +extern void commit_edge_insertions (void); + +extern edge unchecked_make_edge (basic_block, basic_block, int); +extern edge cached_make_edge (sbitmap, basic_block, basic_block, int); +extern edge make_edge (basic_block, basic_block, int); +extern edge make_single_succ_edge (basic_block, basic_block, int); +extern void remove_edge_raw (edge); +extern void redirect_edge_succ (edge, basic_block); +extern edge redirect_edge_succ_nodup (edge, basic_block); +extern void redirect_edge_pred (edge, basic_block); +extern basic_block create_basic_block_structure (rtx, rtx, rtx, basic_block); +extern void clear_bb_flags (void); +extern void dump_bb_info (FILE *, basic_block, int, int, bool, bool); +extern void dump_edge_info (FILE *, edge, int, int); +extern void debug (edge_def &ref); +extern void debug (edge_def *ptr); +extern void brief_dump_cfg (FILE *, int); +extern void clear_edges (void); +extern void scale_bbs_frequencies_int (basic_block *, int, int, int); +extern void scale_bbs_frequencies_gcov_type (basic_block *, int, gcov_type, + gcov_type); + +/* Structure to group all of the information to process IF-THEN and + IF-THEN-ELSE blocks for the conditional execution support. This + needs to be in a public file in case the IFCVT macros call + functions passing the ce_if_block data structure. */ + +struct ce_if_block +{ + basic_block test_bb; /* First test block. */ + basic_block then_bb; /* THEN block. */ + basic_block else_bb; /* ELSE block or NULL. */ + basic_block join_bb; /* Join THEN/ELSE blocks. */ + basic_block last_test_bb; /* Last bb to hold && or || tests. */ + int num_multiple_test_blocks; /* # of && and || basic blocks. */ + int num_and_and_blocks; /* # of && blocks. */ + int num_or_or_blocks; /* # of || blocks. */ + int num_multiple_test_insns; /* # of insns in && and || blocks. */ + int and_and_p; /* Complex test is &&. */ + int num_then_insns; /* # of insns in THEN block. */ + int num_else_insns; /* # of insns in ELSE block. */ + int pass; /* Pass number. */ +}; + +/* This structure maintains an edge list vector. */ +/* FIXME: Make this a vec<edge>. */ +struct edge_list +{ + int num_edges; + edge *index_to_edge; +}; + +/* Class to compute and manage control dependences on an edge-list. */ +class control_dependences +{ +public: + control_dependences (edge_list *); + ~control_dependences (); + bitmap get_edges_dependent_on (int); + edge get_edge (int); + +private: + void set_control_dependence_map_bit (basic_block, int); + void clear_control_dependence_bitmap (basic_block); + void find_control_dependence (int); + vec<bitmap> control_dependence_map; + edge_list *m_el; +}; + +/* The base value for branch probability notes and edge probabilities. */ +#define REG_BR_PROB_BASE 10000 + +/* This is the value which indicates no edge is present. */ +#define EDGE_INDEX_NO_EDGE -1 + +/* EDGE_INDEX returns an integer index for an edge, or EDGE_INDEX_NO_EDGE + if there is no edge between the 2 basic blocks. */ +#define EDGE_INDEX(el, pred, succ) (find_edge_index ((el), (pred), (succ))) + +/* INDEX_EDGE_PRED_BB and INDEX_EDGE_SUCC_BB return a pointer to the basic + block which is either the pred or succ end of the indexed edge. */ +#define INDEX_EDGE_PRED_BB(el, index) ((el)->index_to_edge[(index)]->src) +#define INDEX_EDGE_SUCC_BB(el, index) ((el)->index_to_edge[(index)]->dest) + +/* INDEX_EDGE returns a pointer to the edge. */ +#define INDEX_EDGE(el, index) ((el)->index_to_edge[(index)]) + +/* Number of edges in the compressed edge list. */ +#define NUM_EDGES(el) ((el)->num_edges) + +/* BB is assumed to contain conditional jump. Return the fallthru edge. */ +#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) (EDGE_SUCC ((bb), 0)->flags & EDGE_FALLTHRU \ + ? EDGE_SUCC ((bb), 1) : EDGE_SUCC ((bb), 0)) + +#define RDIV(X,Y) (((X) + (Y) / 2) / (Y)) +/* Return expected execution frequency of the edge E. */ +#define EDGE_FREQUENCY(e) RDIV ((e)->src->frequency * (e)->probability, \ + REG_BR_PROB_BASE) + +/* Compute a scale factor (or probability) suitable for scaling of + gcov_type values via apply_probability() and apply_scale(). */ +#define GCOV_COMPUTE_SCALE(num,den) \ + ((den) ? RDIV ((num) * REG_BR_PROB_BASE, (den)) : REG_BR_PROB_BASE) + +/* Return nonzero if edge is critical. */ +#define EDGE_CRITICAL_P(e) (EDGE_COUNT ((e)->src->succs) >= 2 \ + && EDGE_COUNT ((e)->dest->preds) >= 2) + +#define EDGE_COUNT(ev) vec_safe_length (ev) +#define EDGE_I(ev,i) (*ev)[(i)] +#define EDGE_PRED(bb,i) (*(bb)->preds)[(i)] +#define EDGE_SUCC(bb,i) (*(bb)->succs)[(i)] + +/* Returns true if BB has precisely one successor. */ + +static inline bool +single_succ_p (const_basic_block bb) +{ + return EDGE_COUNT (bb->succs) == 1; +} + +/* Returns true if BB has precisely one predecessor. */ + +static inline bool +single_pred_p (const_basic_block bb) +{ + return EDGE_COUNT (bb->preds) == 1; +} + +/* Returns the single successor edge of basic block BB. Aborts if + BB does not have exactly one successor. */ + +static inline edge +single_succ_edge (const_basic_block bb) +{ + gcc_checking_assert (single_succ_p (bb)); + return EDGE_SUCC (bb, 0); +} + +/* Returns the single predecessor edge of basic block BB. Aborts + if BB does not have exactly one predecessor. */ + +static inline edge +single_pred_edge (const_basic_block bb) +{ + gcc_checking_assert (single_pred_p (bb)); + return EDGE_PRED (bb, 0); +} + +/* Returns the single successor block of basic block BB. Aborts + if BB does not have exactly one successor. */ + +static inline basic_block +single_succ (const_basic_block bb) +{ + return single_succ_edge (bb)->dest; +} + +/* Returns the single predecessor block of basic block BB. Aborts + if BB does not have exactly one predecessor.*/ + +static inline basic_block +single_pred (const_basic_block bb) +{ + return single_pred_edge (bb)->src; +} + +/* Iterator object for edges. */ + +struct edge_iterator { + unsigned index; + vec<edge, va_gc> **container; +}; + +static inline vec<edge, va_gc> * +ei_container (edge_iterator i) +{ + gcc_checking_assert (i.container); + return *i.container; +} + +#define ei_start(iter) ei_start_1 (&(iter)) +#define ei_last(iter) ei_last_1 (&(iter)) + +/* Return an iterator pointing to the start of an edge vector. */ +static inline edge_iterator +ei_start_1 (vec<edge, va_gc> **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_1 (vec<edge, va_gc> **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 (ei_container (i))); +} + +/* 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 (ei_container (i))); +} + +/* Advance the iterator to the next element. */ +static inline void +ei_next (edge_iterator *i) +{ + gcc_checking_assert (i->index < EDGE_COUNT (ei_container (*i))); + i->index++; +} + +/* Move the iterator to the previous element. */ +static inline void +ei_prev (edge_iterator *i) +{ + gcc_checking_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 (ei_container (i), 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; +} + +/* Return 1 if we should continue to iterate. Return 0 otherwise. + *Edge P is set to the next edge if we are to continue to iterate + and NULL otherwise. */ + +static inline bool +ei_cond (edge_iterator ei, edge *p) +{ + if (!ei_end_p (ei)) + { + *p = ei_edge (ei); + return 1; + } + else + { + *p = NULL; + return 0; + } +} + +/* This macro serves as a convenient way to iterate each edge in a + vector of predecessor 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) + remove_edge (e); + ELSE + ei_next (&ei); + } +*/ + +#define FOR_EACH_EDGE(EDGE,ITER,EDGE_VEC) \ + for ((ITER) = ei_start ((EDGE_VEC)); \ + ei_cond ((ITER), &(EDGE)); \ + ei_next (&(ITER))) + +#define CLEANUP_EXPENSIVE 1 /* Do relatively expensive optimizations + except for edge forwarding */ +#define CLEANUP_CROSSJUMP 2 /* Do crossjumping. */ +#define CLEANUP_POST_REGSTACK 4 /* We run after reg-stack and need + to care REG_DEAD notes. */ +#define CLEANUP_THREADING 8 /* Do jump threading. */ +#define CLEANUP_NO_INSN_DEL 16 /* Do not try to delete trivially dead + insns. */ +#define CLEANUP_CFGLAYOUT 32 /* Do cleanup in cfglayout mode. */ +#define CLEANUP_CFG_CHANGED 64 /* The caller changed the CFG. */ + +/* In cfganal.c */ +extern void bitmap_intersection_of_succs (sbitmap, sbitmap *, basic_block); +extern void bitmap_intersection_of_preds (sbitmap, sbitmap *, basic_block); +extern void bitmap_union_of_succs (sbitmap, sbitmap *, basic_block); +extern void bitmap_union_of_preds (sbitmap, sbitmap *, basic_block); + +/* In lcm.c */ +extern struct edge_list *pre_edge_lcm (int, sbitmap *, sbitmap *, + sbitmap *, sbitmap *, sbitmap **, + sbitmap **); +extern struct edge_list *pre_edge_rev_lcm (int, sbitmap *, + sbitmap *, sbitmap *, + sbitmap *, sbitmap **, + sbitmap **); +extern void compute_available (sbitmap *, sbitmap *, sbitmap *, sbitmap *); + +/* In predict.c */ +extern bool maybe_hot_bb_p (struct function *, const_basic_block); +extern bool maybe_hot_edge_p (edge); +extern bool probably_never_executed_bb_p (struct function *, const_basic_block); +extern bool probably_never_executed_edge_p (struct function *, edge); +extern bool optimize_bb_for_size_p (const_basic_block); +extern bool optimize_bb_for_speed_p (const_basic_block); +extern bool optimize_edge_for_size_p (edge); +extern bool optimize_edge_for_speed_p (edge); +extern bool optimize_loop_for_size_p (struct loop *); +extern bool optimize_loop_for_speed_p (struct loop *); +extern bool optimize_loop_nest_for_size_p (struct loop *); +extern bool optimize_loop_nest_for_speed_p (struct loop *); +extern bool gimple_predicted_by_p (const_basic_block, enum br_predictor); +extern bool rtl_predicted_by_p (const_basic_block, enum br_predictor); +extern void gimple_predict_edge (edge, enum br_predictor, int); +extern void rtl_predict_edge (edge, enum br_predictor, int); +extern void predict_edge_def (edge, enum br_predictor, enum prediction); +extern void guess_outgoing_edge_probabilities (basic_block); +extern void remove_predictions_associated_with_edge (edge); +extern bool edge_probability_reliable_p (const_edge); +extern bool br_prob_note_reliable_p (const_rtx); +extern bool predictable_edge_p (edge); + +/* In cfg.c */ +extern void init_flow (struct function *); +extern void debug_bb (basic_block); +extern basic_block debug_bb_n (int); +extern void dump_flow_info (FILE *, int); +extern void expunge_block (basic_block); +extern void link_block (basic_block, basic_block); +extern void unlink_block (basic_block); +extern void compact_blocks (void); +extern basic_block alloc_block (void); +extern void alloc_aux_for_blocks (int); +extern void clear_aux_for_blocks (void); +extern void free_aux_for_blocks (void); +extern void alloc_aux_for_edge (edge, int); +extern void alloc_aux_for_edges (int); +extern void clear_aux_for_edges (void); +extern void free_aux_for_edges (void); + +/* In cfganal.c */ +extern void find_unreachable_blocks (void); +extern bool mark_dfs_back_edges (void); +struct edge_list * create_edge_list (void); +void free_edge_list (struct edge_list *); +void print_edge_list (FILE *, struct edge_list *); +void verify_edge_list (FILE *, struct edge_list *); +int find_edge_index (struct edge_list *, basic_block, basic_block); +edge find_edge (basic_block, basic_block); +extern void remove_fake_edges (void); +extern void remove_fake_exit_edges (void); +extern void add_noreturn_fake_exit_edges (void); +extern void connect_infinite_loops_to_exit (void); +extern int post_order_compute (int *, bool, bool); +extern basic_block dfs_find_deadend (basic_block); +extern int inverted_post_order_compute (int *); +extern int pre_and_rev_post_order_compute_fn (struct function *, + int *, int *, bool); +extern int pre_and_rev_post_order_compute (int *, int *, bool); +extern int dfs_enumerate_from (basic_block, int, + bool (*)(const_basic_block, const void *), + basic_block *, int, const void *); +extern void compute_dominance_frontiers (struct bitmap_head *); +extern bitmap compute_idf (bitmap, struct bitmap_head *); +extern basic_block * single_pred_before_succ_order (void); + +/* In cfgrtl.c */ +extern rtx block_label (basic_block); +extern rtx bb_note (basic_block); +extern bool purge_all_dead_edges (void); +extern bool purge_dead_edges (basic_block); +extern bool fixup_abnormal_edges (void); +extern basic_block force_nonfallthru_and_redirect (edge, basic_block, rtx); +extern bool contains_no_active_insn_p (const_basic_block); +extern bool forwarder_block_p (const_basic_block); +extern bool can_fallthru (basic_block, basic_block); +extern void emit_barrier_after_bb (basic_block bb); +extern void fixup_partitions (void); + +/* In cfgbuild.c. */ +extern void find_many_sub_basic_blocks (sbitmap); +extern void rtl_make_eh_edge (sbitmap, basic_block, rtx); + +enum replace_direction { dir_none, dir_forward, dir_backward, dir_both }; + +/* In cfgcleanup.c. */ +extern bool cleanup_cfg (int); +extern int flow_find_cross_jump (basic_block, basic_block, rtx *, rtx *, + enum replace_direction*); +extern int flow_find_head_matching_sequence (basic_block, basic_block, + rtx *, rtx *, int); + +extern bool delete_unreachable_blocks (void); + +extern void update_br_prob_note (basic_block); +extern bool inside_basic_block_p (const_rtx); +extern bool control_flow_insn_p (const_rtx); +extern rtx get_last_bb_insn (basic_block); + +/* In dominance.c */ + +enum cdi_direction +{ + CDI_DOMINATORS = 1, + CDI_POST_DOMINATORS = 2 +}; + +extern enum dom_state dom_info_state (enum cdi_direction); +extern void set_dom_info_availability (enum cdi_direction, enum dom_state); +extern bool dom_info_available_p (enum cdi_direction); +extern void calculate_dominance_info (enum cdi_direction); +extern void free_dominance_info (enum cdi_direction); +extern basic_block nearest_common_dominator (enum cdi_direction, + basic_block, basic_block); +extern basic_block nearest_common_dominator_for_set (enum cdi_direction, + bitmap); +extern void set_immediate_dominator (enum cdi_direction, basic_block, + basic_block); +extern basic_block get_immediate_dominator (enum cdi_direction, basic_block); +extern bool dominated_by_p (enum cdi_direction, const_basic_block, const_basic_block); +extern vec<basic_block> get_dominated_by (enum cdi_direction, basic_block); +extern vec<basic_block> get_dominated_by_region (enum cdi_direction, + basic_block *, + unsigned); +extern vec<basic_block> get_dominated_to_depth (enum cdi_direction, + basic_block, int); +extern vec<basic_block> get_all_dominated_blocks (enum cdi_direction, + basic_block); +extern void add_to_dominance_info (enum cdi_direction, basic_block); +extern void delete_from_dominance_info (enum cdi_direction, basic_block); +basic_block recompute_dominator (enum cdi_direction, basic_block); +extern void redirect_immediate_dominators (enum cdi_direction, basic_block, + basic_block); +extern void iterate_fix_dominators (enum cdi_direction, + vec<basic_block> , bool); +extern void verify_dominators (enum cdi_direction); +extern basic_block first_dom_son (enum cdi_direction, basic_block); +extern basic_block next_dom_son (enum cdi_direction, basic_block); +unsigned bb_dom_dfs_in (enum cdi_direction, basic_block); +unsigned bb_dom_dfs_out (enum cdi_direction, basic_block); + +extern edge try_redirect_by_replacing_jump (edge, basic_block, bool); +extern void break_superblocks (void); +extern void relink_block_chain (bool); +extern void update_bb_profile_for_threading (basic_block, int, gcov_type, edge); +extern void init_rtl_bb_info (basic_block); + +extern void initialize_original_copy_tables (void); +extern void free_original_copy_tables (void); +extern void set_bb_original (basic_block, basic_block); +extern basic_block get_bb_original (basic_block); +extern void set_bb_copy (basic_block, basic_block); +extern basic_block get_bb_copy (basic_block); +void set_loop_copy (struct loop *, struct loop *); +struct loop *get_loop_copy (struct loop *); + +#include "cfghooks.h" + +/* Return true if BB is in a transaction. */ + +static inline bool +bb_in_transaction (basic_block bb) +{ + return bb->flags & BB_IN_TRANSACTION; +} + +/* Return true when one of the predecessor edges of BB is marked with EDGE_EH. */ +static inline bool +bb_has_eh_pred (basic_block bb) +{ + edge e; + edge_iterator ei; + + FOR_EACH_EDGE (e, ei, bb->preds) + { + if (e->flags & EDGE_EH) + return true; + } + return false; +} + +/* Return true when one of the predecessor edges of BB is marked with EDGE_ABNORMAL. */ +static inline bool +bb_has_abnormal_pred (basic_block bb) +{ + edge e; + edge_iterator ei; + + FOR_EACH_EDGE (e, ei, bb->preds) + { + if (e->flags & EDGE_ABNORMAL) + return true; + } + return false; +} + +/* Return the fallthru edge in EDGES if it exists, NULL otherwise. */ +static inline edge +find_fallthru_edge (vec<edge, va_gc> *edges) +{ + edge e; + edge_iterator ei; + + FOR_EACH_EDGE (e, ei, edges) + if (e->flags & EDGE_FALLTHRU) + break; + + return e; +} + +/* In cfgloopmanip.c. */ +extern edge mfb_kj_edge; +extern bool mfb_keep_just (edge); + +/* In cfgexpand.c. */ +extern void rtl_profile_for_bb (basic_block); +extern void rtl_profile_for_edge (edge); +extern void default_rtl_profile (void); + +/* In profile.c. */ +typedef struct gcov_working_set_info gcov_working_set_t; +extern gcov_working_set_t *find_working_set (unsigned pct_times_10); + +/* Check tha probability is sane. */ + +static inline void +check_probability (int prob) +{ + gcc_checking_assert (prob >= 0 && prob <= REG_BR_PROB_BASE); +} + +/* Given PROB1 and PROB2, return PROB1*PROB2/REG_BR_PROB_BASE. + Used to combine BB probabilities. */ + +static inline int +combine_probabilities (int prob1, int prob2) +{ + check_probability (prob1); + check_probability (prob2); + return RDIV (prob1 * prob2, REG_BR_PROB_BASE); +} + +/* Apply scale factor SCALE on frequency or count FREQ. Use this + interface when potentially scaling up, so that SCALE is not + constrained to be < REG_BR_PROB_BASE. */ + +static inline gcov_type +apply_scale (gcov_type freq, gcov_type scale) +{ + return RDIV (freq * scale, REG_BR_PROB_BASE); +} + +/* Apply probability PROB on frequency or count FREQ. */ + +static inline gcov_type +apply_probability (gcov_type freq, int prob) +{ + check_probability (prob); + return apply_scale (freq, prob); +} + +/* Return inverse probability for PROB. */ + +static inline int +inverse_probability (int prob1) +{ + check_probability (prob1); + return REG_BR_PROB_BASE - prob1; +} + +/* Return true if BB has at least one abnormal outgoing edge. */ + +static inline bool +has_abnormal_or_eh_outgoing_edge_p (basic_block bb) +{ + edge e; + edge_iterator ei; + + FOR_EACH_EDGE (e, ei, bb->succs) + if (e->flags & (EDGE_ABNORMAL | EDGE_EH)) + return true; + + return false; +} +#endif /* GCC_BASIC_BLOCK_H */ |