/* Data and Control Flow Analysis for Trees.
- Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008
+ Copyright (C) 2001, 2003, 2004, 2005, 2006, 2007, 2008, 2009
Free Software Foundation, Inc.
Contributed by Diego Novillo <dnovillo@redhat.com>
#include "tree-ssa-operands.h"
#include "cgraph.h"
#include "ipa-reference.h"
-
-/* Forward declare structures for the garbage collector GTY markers. */
-#ifndef GCC_BASIC_BLOCK_H
-struct edge_def;
-typedef struct edge_def *edge;
-struct basic_block_def;
-typedef struct basic_block_def *basic_block;
-#endif
-struct static_var_ann_d;
-
-/* The reasons a variable may escape a function. */
-enum escape_type
-{
- NO_ESCAPE = 0, /* Doesn't escape. */
- ESCAPE_STORED_IN_GLOBAL = 1 << 0,
- ESCAPE_TO_ASM = 1 << 1, /* Passed by address to an assembly
- statement. */
- ESCAPE_TO_CALL = 1 << 2, /* Escapes to a function call. */
- ESCAPE_BAD_CAST = 1 << 3, /* Cast from pointer to integer */
- ESCAPE_TO_RETURN = 1 << 4, /* Returned from function. */
- ESCAPE_TO_PURE_CONST = 1 << 5, /* Escapes to a pure or constant
- function call. */
- ESCAPE_IS_GLOBAL = 1 << 6, /* Is a global variable. */
- ESCAPE_IS_PARM = 1 << 7, /* Is an incoming function argument. */
- ESCAPE_UNKNOWN = 1 << 8 /* We believe it escapes for
- some reason not enumerated
- above. */
-};
-
-/* Memory reference statistics for individual memory symbols,
- collected during alias analysis. */
-struct mem_sym_stats_d GTY(())
-{
- /* Memory symbol. */
- tree var;
-
- /* Nonzero if this entry has been assigned a partition. */
- unsigned int partitioned_p : 1;
-
- /* Nonzero if VAR is a memory partition tag that already contains
- call-clobbered variables in its partition set. */
- unsigned int has_call_clobbered_vars : 1;
-
- /* Number of direct reference sites. A direct reference to VAR is any
- reference of the form 'VAR = ' or ' = VAR'. For GIMPLE reg
- pointers, this is the number of sites where the pointer is
- dereferenced. */
- long num_direct_writes;
- long num_direct_reads;
-
- /* Number of indirect reference sites. An indirect reference to VAR
- is any reference via a pointer that contains VAR in its points-to
- set or, in the case of call-clobbered symbols, a function call. */
- long num_indirect_writes;
- long num_indirect_reads;
-
- /* Execution frequency. This is the sum of the execution
- frequencies of all the statements that reference this object
- weighted by the number of references in each statement. This is
- the main key used to sort the list of symbols to partition.
- Symbols with high execution frequencies are put at the bottom of
- the work list (ie, they are partitioned last).
- Execution frequencies are taken directly from each basic block,
- so compiling with PGO enabled will increase the precision of this
- estimate. */
- long frequency_reads;
- long frequency_writes;
-
- /* Set of memory tags that contain VAR in their alias set. */
- bitmap parent_tags;
-};
-
-typedef struct mem_sym_stats_d *mem_sym_stats_t;
-DEF_VEC_P(mem_sym_stats_t);
-DEF_VEC_ALLOC_P(mem_sym_stats_t, heap);
-
-/* Memory reference statistics collected during alias analysis. */
-struct mem_ref_stats_d GTY(())
-{
- /* Number of statements that make memory references. */
- long num_mem_stmts;
-
- /* Number of statements that make function calls. */
- long num_call_sites;
-
- /* Number of statements that make calls to pure/const functions. */
- long num_pure_const_call_sites;
-
- /* Number of ASM statements. */
- long num_asm_sites;
-
- /* Estimated number of virtual operands needed as computed by
- compute_memory_partitions. */
- long num_vuses;
- long num_vdefs;
-
- /* This maps every symbol used to make "memory" references
- (pointers, arrays, structures, etc) to an instance of struct
- mem_sym_stats_d describing reference statistics for the symbol. */
- struct pointer_map_t * GTY((skip)) mem_sym_stats;
-};
+#include "tree-ssa-alias.h"
/* Gimple dataflow datastructure. All publicly available fields shall have
gimple_ accessor defined in tree-flow-inline.h, all publicly modifiable
fields should have gimple_set accessor. */
-struct gimple_df GTY(())
-{
+struct GTY(()) gimple_df {
/* Array of all variables referenced in the function. */
htab_t GTY((param_is (union tree_node))) referenced_vars;
/* Array of all SSA_NAMEs used in the function. */
VEC(tree,gc) *ssa_names;
- /* Artificial variable used to model the effects of function calls. */
- tree global_var;
+ /* Artificial variable used for the virtual operand FUD chain. */
+ tree vop;
/* Artificial variable used to model the effects of nonlocal
variables. */
tree nonlocal_all;
- /* Call clobbered variables in the function. If bit I is set, then
- REFERENCED_VARS (I) is call-clobbered. */
- bitmap call_clobbered_vars;
+ /* The PTA solution for the ESCAPED artificial variable. */
+ struct pt_solution escaped;
- /* Call-used variables in the function. If bit I is set, then
- REFERENCED_VARS (I) is call-used at pure function call-sites. */
- bitmap call_used_vars;
+ /* The PTA solution for the CALLUSED artificial variable. */
+ struct pt_solution callused;
- /* Addressable variables in the function. If bit I is set, then
- REFERENCED_VARS (I) has had its address taken. Note that
- CALL_CLOBBERED_VARS and ADDRESSABLE_VARS are not related. An
- addressable variable is not necessarily call-clobbered (e.g., a
- local addressable whose address does not escape) and not all
- call-clobbered variables are addressable (e.g., a local static
- variable). */
- bitmap addressable_vars;
+ /* A map of decls to artificial ssa-names that point to the partition
+ of the decl. */
+ struct pointer_map_t * GTY((skip(""))) decls_to_pointers;
/* Free list of SSA_NAMEs. */
tree free_ssanames;
for this variable with an empty defining statement. */
htab_t GTY((param_is (union tree_node))) default_defs;
- /* 'true' after aliases have been computed (see compute_may_aliases). */
- unsigned int aliases_computed_p : 1;
+ /* Symbols whose SSA form needs to be updated or created for the first
+ time. */
+ bitmap syms_to_rename;
/* True if the code is in ssa form. */
unsigned int in_ssa_p : 1;
struct ssa_operands ssa_operands;
-
- /* Memory reference statistics collected during alias analysis.
- This information is used to drive the memory partitioning
- heuristics in compute_memory_partitions. */
- struct mem_ref_stats_d mem_ref_stats;
};
/* Accessors for internal use only. Generic code should use abstraction
#define SSANAMES(fun) (fun)->gimple_df->ssa_names
#define MODIFIED_NORETURN_CALLS(fun) (fun)->gimple_df->modified_noreturn_calls
#define DEFAULT_DEFS(fun) (fun)->gimple_df->default_defs
+#define SYMS_TO_RENAME(fun) (fun)->gimple_df->syms_to_rename
typedef struct
{
---------------------------------------------------------------------------*/
/* Aliasing information for SSA_NAMEs representing pointer variables. */
-struct ptr_info_def GTY(())
+struct GTY(()) ptr_info_def
{
- /* Mask of reasons this pointer's value escapes the function. */
- ENUM_BITFIELD (escape_type) escape_mask : 9;
-
- /* Nonzero if points-to analysis couldn't determine where this pointer
- is pointing to. */
- unsigned int pt_anything : 1;
-
- /* Nonzero if the value of this pointer escapes the current function. */
- unsigned int value_escapes_p : 1;
-
- /* Nonzero if a memory tag is needed for this pointer. This is
- true if this pointer is eventually dereferenced. */
- unsigned int memory_tag_needed : 1;
-
- /* Nonzero if this pointer is really dereferenced. */
- unsigned int is_dereferenced : 1;
-
- /* Nonzero if this pointer points to a global variable. */
- unsigned int pt_global_mem : 1;
-
- /* Nonzero if this pointer points to NULL. */
- unsigned int pt_null : 1;
-
- /* Set of variables that this pointer may point to. */
- bitmap pt_vars;
-
- /* If this pointer has been dereferenced, and points-to information is
- more precise than type-based aliasing, indirect references to this
- pointer will be represented by this memory tag, instead of the type
- tag computed by TBAA. */
- tree name_mem_tag;
+ /* The points-to solution, TBAA-pruned if the pointer is dereferenced. */
+ struct pt_solution pt;
};
---------------------------------------------------------------------------*/
enum tree_ann_type { TREE_ANN_COMMON, VAR_ANN, FUNCTION_ANN };
-struct tree_ann_common_d GTY(())
-{
+struct GTY(()) tree_ann_common_d {
/* Annotation type. */
enum tree_ann_type type;
expansion (see gimple_to_tree). */
int rn;
- /* Auxiliary info specific to a pass. At all times, this
- should either point to valid data or be NULL. */
- PTR GTY ((skip (""))) aux;
-
- /* The value handle for this expression. Used by GVN-PRE. */
- tree GTY((skip)) value_handle;
-
/* Pointer to original GIMPLE statement. Used during RTL expansion
(see gimple_to_tree). */
gimple stmt;
};
-struct var_ann_d GTY(())
-{
+struct GTY(()) var_ann_d {
struct tree_ann_common_d common;
- /* Used by the out of SSA pass to determine whether this variable has
- been seen yet or not. */
- unsigned out_of_ssa_tag : 1;
-
/* Used when building base variable structures in a var_map. */
unsigned base_var_processed : 1;
states. */
ENUM_BITFIELD (need_phi_state) need_phi_state : 2;
- /* Used during operand processing to determine if this variable is already
- in the VUSE list. */
- unsigned in_vuse_list : 1;
-
- /* Used during operand processing to determine if this variable is already
- in the VDEF list. */
- unsigned in_vdef_list : 1;
-
/* True for HEAP artificial variables. These variables represent
the memory area allocated by a call to malloc. */
unsigned is_heapvar : 1;
- /* True if the variable is call clobbered. */
- unsigned call_clobbered : 1;
-
/* This field describes several "no alias" attributes that some
symbols are known to have. See the enum's definition for more
information on each attribute. */
ENUM_BITFIELD (noalias_state) noalias_state : 2;
- /* Mask of values saying the reasons why this variable has escaped
- the function. */
- ENUM_BITFIELD (escape_type) escape_mask : 9;
-
- /* Memory partition tag assigned to this symbol. */
- tree mpt;
-
- /* If this variable is a pointer P that has been dereferenced, this
- field is an artificial variable that represents the memory
- location *P. Every other pointer Q that is type-compatible with
- P will also have the same memory tag. If the variable is not a
- pointer or if it is never dereferenced, this must be NULL.
- FIXME, do we really need this here? How much slower would it be
- to convert to hash table? */
- tree symbol_mem_tag;
-
- /* Used when going out of SSA form to indicate which partition this
- variable represents storage for. */
- unsigned partition;
-
/* Used by var_map for the base index of ssa base variables. */
unsigned base_index;
tree current_def;
};
-/* Container for variable annotation used by hashtable for annotations for
- static variables. */
-struct static_var_ann_d GTY(())
-{
- struct var_ann_d ann;
- unsigned int uid;
-};
-
-struct function_ann_d GTY(())
-{
- struct tree_ann_common_d common;
-};
-
/* Immediate use lists are used to directly access all uses for an SSA
name and get pointers to the statement for each use.
-union tree_ann_d GTY((desc ("ann_type ((tree_ann_t)&%h)")))
-{
+union GTY((desc ("ann_type ((tree_ann_t)&%h)"))) tree_ann_d {
struct tree_ann_common_d GTY((tag ("TREE_ANN_COMMON"))) common;
struct var_ann_d GTY((tag ("VAR_ANN"))) vdecl;
- struct function_ann_d GTY((tag ("FUNCTION_ANN"))) fdecl;
};
typedef union tree_ann_d *tree_ann_t;
typedef struct var_ann_d *var_ann_t;
-typedef struct function_ann_d *function_ann_t;
typedef struct tree_ann_common_d *tree_ann_common_t;
static inline tree_ann_common_t tree_common_ann (const_tree);
static inline tree_ann_common_t get_tree_common_ann (tree);
static inline var_ann_t var_ann (const_tree);
static inline var_ann_t get_var_ann (tree);
-static inline function_ann_t function_ann (const_tree);
-static inline function_ann_t get_function_ann (tree);
static inline enum tree_ann_type ann_type (tree_ann_t);
static inline void update_stmt (gimple);
-static inline bitmap may_aliases (const_tree);
static inline int get_lineno (const_gimple);
/*---------------------------------------------------------------------------
Structure representing predictions in tree level.
---------------------------------------------------------------------------*/
-struct edge_prediction GTY((chain_next ("%h.ep_next")))
-{
+struct GTY((chain_next ("%h.ep_next"))) edge_prediction {
struct edge_prediction *ep_next;
edge ep_edge;
enum br_predictor ep_predictor;
/*---------------------------------------------------------------------------
Global declarations
---------------------------------------------------------------------------*/
-struct int_tree_map GTY(())
-{
+struct GTY(()) int_tree_map {
unsigned int uid;
tree to;
/* In tree-pretty-print.c. */
extern void dump_generic_bb (FILE *, basic_block, int, int);
+extern int op_code_prio (enum tree_code);
+extern int op_prio (const_tree);
extern const char *op_symbol_code (enum tree_code);
/* In tree-dfa.c */
extern var_ann_t create_var_ann (tree);
-extern function_ann_t create_function_ann (tree);
extern void renumber_gimple_stmt_uids (void);
+extern void renumber_gimple_stmt_uids_in_blocks (basic_block *, int);
extern tree_ann_common_t create_tree_common_ann (tree);
extern void dump_dfa_stats (FILE *);
extern void debug_dfa_stats (void);
extern void dump_variable (FILE *, tree);
extern void debug_variable (tree);
extern tree get_virtual_var (tree);
-extern void add_referenced_var (tree);
+extern bool add_referenced_var (tree);
extern void remove_referenced_var (tree);
extern void mark_symbols_for_renaming (gimple);
extern void find_new_referenced_vars (gimple);
extern void set_default_def (tree, tree);
extern tree gimple_default_def (struct function *, tree);
extern bool stmt_references_abnormal_ssa_name (gimple);
-extern bool refs_may_alias_p (tree, tree);
-extern gimple get_single_def_stmt (gimple);
-extern gimple get_single_def_stmt_from_phi (tree, gimple);
-extern gimple get_single_def_stmt_with_phi (tree, gimple);
+extern tree get_ref_base_and_extent (tree, HOST_WIDE_INT *,
+ HOST_WIDE_INT *, HOST_WIDE_INT *);
+extern void find_referenced_vars_in (gimple);
/* In tree-phinodes.c */
extern void reserve_phi_args_for_new_edge (basic_block);
extern void add_phi_node_to_bb (gimple phi, basic_block bb);
extern gimple make_phi_node (tree var, int len);
extern gimple create_phi_node (tree, basic_block);
-extern void add_phi_arg (gimple, tree, edge);
+extern void add_phi_arg (gimple, tree, edge, source_location);
extern void remove_phi_args (edge);
extern void remove_phi_node (gimple_stmt_iterator *, bool);
+extern void remove_phi_nodes (basic_block);
extern void init_phinodes (void);
extern void fini_phinodes (void);
extern void release_phi_node (gimple);
extern bool block_may_fallthru (const_tree);
extern bool gimple_seq_may_fallthru (gimple_seq);
extern bool gimple_stmt_may_fallthru (gimple);
-
-/* In tree-ssa-alias.c */
-extern unsigned int compute_may_aliases (void);
-extern void dump_may_aliases_for (FILE *, tree);
-extern void debug_may_aliases_for (tree);
-extern void dump_alias_info (FILE *);
-extern void debug_alias_info (void);
-extern void dump_points_to_info (FILE *);
-extern void debug_points_to_info (void);
-extern void dump_points_to_info_for (FILE *, tree);
-extern void debug_points_to_info_for (tree);
-extern bool may_be_aliased (tree);
-extern bool may_alias_p (tree, alias_set_type, tree, alias_set_type, bool);
-extern struct ptr_info_def *get_ptr_info (tree);
-extern bool may_point_to_global_var (tree);
-extern void new_type_alias (tree, tree, tree);
-extern void count_uses_and_derefs (tree, gimple, unsigned *, unsigned *,
- unsigned *);
-static inline bool ref_contains_array_ref (const_tree);
-static inline bool array_ref_contains_indirect_ref (const_tree);
-extern tree get_ref_base_and_extent (tree, HOST_WIDE_INT *,
- HOST_WIDE_INT *, HOST_WIDE_INT *);
-extern tree create_tag_raw (enum tree_code, tree, const char *);
-extern void delete_mem_ref_stats (struct function *);
-extern void dump_mem_ref_stats (FILE *);
-extern void debug_mem_ref_stats (void);
-extern void debug_memory_partitions (void);
-extern void debug_mem_sym_stats (tree var);
-extern void dump_mem_sym_stats_for_var (FILE *, tree);
-extern void debug_all_mem_sym_stats (void);
-
-/* Call-back function for walk_use_def_chains(). At each reaching
- definition, a function with this prototype is called. */
-typedef bool (*walk_use_def_chains_fn) (tree, gimple, void *);
-
-/* In tree-ssa-alias-warnings.c */
-extern void strict_aliasing_warning_backend (void);
+extern bool gimple_check_call_args (gimple);
/* In tree-ssa.c */
/* Mapping for redirected edges. */
-struct _edge_var_map GTY(())
-{
+struct GTY(()) _edge_var_map {
tree result; /* PHI result. */
tree def; /* PHI arg definition. */
+ source_location locus; /* PHI arg location. */
};
typedef struct _edge_var_map edge_var_map;
typedef VEC(edge_var_map, heap) *edge_var_map_vector;
extern void init_tree_ssa (struct function *);
-extern void redirect_edge_var_map_add (edge, tree, tree);
+extern void redirect_edge_var_map_add (edge, tree, tree, source_location);
extern void redirect_edge_var_map_clear (edge);
extern void redirect_edge_var_map_dup (edge, edge);
extern edge_var_map_vector redirect_edge_var_map_vector (edge);
extern void flush_pending_stmts (edge);
extern void verify_ssa (bool);
extern void delete_tree_ssa (void);
-extern void walk_use_def_chains (tree, walk_use_def_chains_fn, void *, bool);
extern bool ssa_undefined_value_p (tree);
+extern void execute_update_addresses_taken (bool);
+/* Call-back function for walk_use_def_chains(). At each reaching
+ definition, a function with this prototype is called. */
+typedef bool (*walk_use_def_chains_fn) (tree, gimple, void *);
+
+extern void walk_use_def_chains (tree, walk_use_def_chains_fn, void *, bool);
+
+void propagate_defs_into_debug_stmts (gimple, basic_block,
+ const gimple_stmt_iterator *);
+void propagate_var_def_into_debug_stmts (tree, basic_block,
+ const gimple_stmt_iterator *);
+void release_defs_bitset (bitmap toremove);
/* In tree-into-ssa.c */
void update_ssa (unsigned);
void delete_update_ssa (void);
void register_new_name_mapping (tree, tree);
tree create_new_def_for (tree, gimple, def_operand_p);
-bool need_ssa_update_p (void);
+bool need_ssa_update_p (struct function *);
bool name_mappings_registered_p (void);
bool name_registered_for_update_p (tree);
bitmap ssa_names_to_replace (void);
extern void dump_dominator_optimization_stats (FILE *);
extern void debug_dominator_optimization_stats (void);
int loop_depth_of_name (tree);
+tree degenerate_phi_result (gimple);
/* In tree-ssa-copy.c */
-extern void merge_alias_info (tree, tree);
extern void propagate_value (use_operand_p, tree);
extern void propagate_tree_value (tree *, tree);
extern void propagate_tree_value_into_stmt (gimple_stmt_iterator *, tree);
enum tree_code cmp;
};
-/* In tree-vectorizer.c */
-unsigned vectorize_loops (void);
-extern bool vect_can_force_dr_alignment_p (const_tree, unsigned int);
-extern tree get_vectype_for_scalar_type (tree);
-
/* In tree-ssa-phiopt.c */
bool empty_block_p (basic_block);
basic_block *blocks_in_phiopt_order (void);
unsigned int canonicalize_induction_variables (void);
unsigned int tree_unroll_loops_completely (bool, bool);
unsigned int tree_ssa_prefetch_arrays (void);
-unsigned int remove_empty_loops (void);
void tree_ssa_iv_optimize (void);
unsigned tree_predictive_commoning (void);
+tree canonicalize_loop_ivs (struct loop *, tree *);
bool parallelize_loops (void);
bool loop_only_exit_p (const struct loop *, const_edge);
void mark_virtual_ops_for_renaming (gimple);
/* In tree-ssa-threadedge.c */
+extern void threadedge_initialize_values (void);
+extern void threadedge_finalize_values (void);
+extern VEC(tree,heap) *ssa_name_values;
+#define SSA_NAME_VALUE(x) \
+ (SSA_NAME_VERSION(x) < VEC_length(tree, ssa_name_values) \
+ ? VEC_index(tree, ssa_name_values, SSA_NAME_VERSION(x)) \
+ : NULL_TREE)
+extern void set_ssa_name_value (tree, tree);
extern bool potentially_threadable_block (basic_block);
extern void thread_across_edge (gimple, edge, bool,
VEC(tree, heap) **, tree (*) (gimple, gimple));
/* In tree-flow-inline.h */
static inline bool is_call_clobbered (const_tree);
-static inline void mark_call_clobbered (tree, unsigned int);
static inline void set_is_used (tree);
static inline bool unmodifiable_var_p (const_tree);
+static inline bool ref_contains_array_ref (const_tree);
+static inline bool array_ref_contains_indirect_ref (const_tree);
/* In tree-eh.c */
extern void make_eh_edges (gimple);
extern bool tree_could_trap_p (tree);
+extern bool operation_could_trap_helper_p (enum tree_code, bool, bool, bool,
+ bool, tree, bool *);
extern bool operation_could_trap_p (enum tree_code, bool, bool, tree);
extern bool stmt_could_throw_p (gimple);
extern bool tree_could_throw_p (tree);
extern bool stmt_can_throw_internal (gimple);
+extern bool stmt_can_throw_external (gimple);
extern void add_stmt_to_eh_region (gimple, int);
extern bool remove_stmt_from_eh_region (gimple);
extern bool maybe_clean_or_replace_eh_stmt (gimple, gimple);
void debug_value_expressions (unsigned int);
void print_value_expressions (FILE *, unsigned int);
-
-/* In tree-vn.c */
-tree make_value_handle (tree);
-void set_value_handle (tree, tree);
-bool expressions_equal_p (tree, tree);
-void sort_vuses (VEC (tree, gc) *);
-void sort_vuses_heap (VEC (tree, heap) *);
-tree vn_lookup_or_add (tree);
-tree vn_lookup_or_add_with_stmt (tree, gimple);
-tree vn_lookup_or_add_with_vuses (tree, VEC (tree, gc) *);
-void vn_add (tree, tree);
-void vn_add_with_vuses (tree, tree, VEC (tree, gc) *);
-tree vn_lookup_with_stmt (tree, gimple);
-tree vn_lookup (tree);
-tree vn_lookup_with_vuses (tree, VEC (tree, gc) *);
-
/* In tree-ssa-sink.c */
bool is_hidden_global_store (gimple);
-/* In tree-sra.c */
-void insert_edge_copies_seq (gimple_seq, basic_block);
-void sra_insert_before (gimple_stmt_iterator *, gimple_seq);
-void sra_insert_after (gimple_stmt_iterator *, gimple_seq);
-void sra_init_cache (void);
-bool sra_type_can_be_decomposed_p (tree);
-
/* In tree-loop-linear.c */
extern void linear_transform_loops (void);
extern unsigned perfect_loop_nest_depth (struct loop *);
bool, enum gsi_iterator_update);
tree gimple_fold_indirect_ref (tree);
-/* In tree-ssa-structalias.c */
-bool find_what_p_points_to (tree);
-bool clobber_what_escaped (void);
-void compute_call_used_vars (void);
-
/* In tree-ssa-live.c */
extern void remove_unused_locals (void);
+extern void dump_scope_blocks (FILE *, int);
+extern void debug_scope_blocks (int);
+extern void debug_scope_block (tree, int);
/* In tree-ssa-address.c */
void get_address_description (tree, struct mem_address *);
tree maybe_fold_tmr (tree);
-void init_alias_heapvars (void);
-void delete_alias_heapvars (void);
+unsigned int execute_free_datastructures (void);
unsigned int execute_fixup_cfg (void);
#include "tree-flow-inline.h"
void swap_tree_operands (gimple, tree *, tree *);
int least_common_multiple (int, int);
+edge redirect_eh_edge (edge e, basic_block new_bb);
#endif /* _TREE_FLOW_H */