diff options
Diffstat (limited to 'gcc/tree-flow.h')
| -rw-r--r-- | gcc/tree-flow.h | 251 |
1 files changed, 25 insertions, 226 deletions
diff --git a/gcc/tree-flow.h b/gcc/tree-flow.h index 868b762..f2d7c5f 100644 --- a/gcc/tree-flow.h +++ b/gcc/tree-flow.h @@ -30,6 +30,7 @@ along with GCC; see the file COPYING3. If not see #include "tree-ssa-operands.h" #include "cgraph.h" #include "ipa-reference.h" +#include "tree-ssa-alias.h" /* Forward declare structures for the garbage collector GTY markers. */ #ifndef GCC_BASIC_BLOCK_H @@ -40,98 +41,6 @@ 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; -}; - /* Gimple dataflow datastructure. All publicly available fields shall have gimple_ accessor defined in tree-flow-inline.h, all publicly modifiable @@ -151,29 +60,18 @@ struct gimple_df GTY(()) /* 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; - - /* 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 ESCAPED artificial variable. */ + struct pt_solution escaped; - /* 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; + /* The PTA solution for the CALLUSED artificial variable. */ + struct pt_solution callused; /* Free list of SSA_NAMEs. */ tree free_ssanames; @@ -184,18 +82,14 @@ struct gimple_df GTY(()) 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 @@ -204,6 +98,7 @@ struct gimple_df GTY(()) #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 { @@ -231,37 +126,8 @@ typedef struct /* Aliasing information for SSA_NAMEs representing pointer variables. */ struct ptr_info_def GTY(()) { - /* 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; }; @@ -359,42 +225,15 @@ struct var_ann_d GTY(()) 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; @@ -535,7 +374,6 @@ 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); /*--------------------------------------------------------------------------- @@ -776,10 +614,8 @@ extern tree make_rename_temp (tree, const char *); 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 *); /* In tree-phinodes.c */ extern void reserve_phi_args_for_new_edge (basic_block); @@ -804,43 +640,6 @@ 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); - /* In tree-ssa.c */ @@ -869,8 +668,14 @@ extern edge ssa_redirect_edge (edge, basic_block); 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); /* In tree-into-ssa.c */ @@ -878,7 +683,7 @@ 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); @@ -1065,9 +870,10 @@ char *get_lsm_tmp_name (tree, unsigned); /* 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); @@ -1149,11 +955,6 @@ tree force_gimple_operand_gsi (gimple_stmt_iterator *, tree, bool, tree, tree gimple_fold_indirect_ref (tree); void mark_addressable (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); @@ -1174,8 +975,6 @@ rtx addr_for_mem_ref (struct mem_address *, bool); 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_fixup_cfg (void); #include "tree-flow-inline.h" |