X-Git-Url: http://git.sourceforge.jp/view?p=pf3gnuchains%2Fgcc-fork.git;a=blobdiff_plain;f=gcc%2Fipa-prop.h;h=9fd2a39f022509b721a97cefa32d026c9aab631f;hp=aca7bf8ef25373cdf7d34a5c03315a074d649827;hb=22f7168e83bec47d92c5530b64befbc781f2d49a;hpb=1917e9458272067cc4eced09fb318d4572fa91dd diff --git a/gcc/ipa-prop.h b/gcc/ipa-prop.h index aca7bf8ef25..9fd2a39f022 100644 --- a/gcc/ipa-prop.h +++ b/gcc/ipa-prop.h @@ -1,5 +1,6 @@ /* Interprocedural analyses. - Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc. + Copyright (C) 2005, 2007, 2008, 2009 + Free Software Foundation, Inc. This file is part of GCC. @@ -23,68 +24,127 @@ along with GCC; see the file COPYING3. If not see #include "tree.h" #include "vec.h" #include "cgraph.h" +#include "gimple.h" /* The following definitions and interfaces are used by - interprocedural analyses. */ + interprocedural analyses or parameters. */ + +/* ipa-prop.c stuff (ipa-cp, indirect inlining): */ /* A jump function for a callsite represents the values passed as actual arguments of the callsite. There are three main types of values : - Formal - the caller's formal parameter is passed as an actual argument. - Constant - a constant is passed as an actual argument. - Unknown - neither of the above. - Integer and real constants are represented as IPA_CONST. - Finally, IPA_CONST_MEMBER_PTR stands for C++ member pointers constants. */ + + Pass-through - the caller's formal parameter is passed as an actual + argument, possibly one simple operation performed on it. + Constant - a constant (is_gimple_ip_invariant)is passed as an actual + argument. + Unknown - neither of the above. + + IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, it is a special + constant in this regard. Other constants are represented with IPA_JF_CONST. + + IPA_JF_ANCESTOR is a special pass-through jump function, which means that + the result is an address of a part of the object pointed to by the formal + parameter to which the function refers. It is mainly intended to represent + getting addresses of of ancestor fields in C++ + (e.g. &this_1(D)->D.1766.D.1756). Note that if the original pointer is + NULL, ancestor jump function must behave like a simple pass-through. + + Other pass-through functions can either simply pass on an unchanged formal + parameter or can apply one simple binary operation to it (such jump + functions are called polynomial). + + IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies + only to pointer parameters. It means that even though we cannot prove that + the passed value is an interprocedural constant, we still know the exact + type of the containing object which may be valuable for devirtualization. + + Jump functions are computed in ipa-prop.c by function + update_call_notes_after_inlining. Some information can be lost and jump + functions degraded accordingly when inlining, see + update_call_notes_after_inlining in the same file. */ + enum jump_func_type { - IPA_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */ - IPA_CONST, - IPA_CONST_MEMBER_PTR, - IPA_PASS_THROUGH + IPA_JF_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */ + IPA_JF_KNOWN_TYPE, /* represented by field base_binfo */ + IPA_JF_CONST, /* represented by field costant */ + IPA_JF_CONST_MEMBER_PTR, /* represented by field member_cst */ + IPA_JF_PASS_THROUGH, /* represented by field pass_through */ + IPA_JF_ANCESTOR /* represented by field ancestor */ }; -/* All formal parameters in the program have a lattice associated with it - computed by the interprocedural stage of IPCP. - There are three main values of the lattice: - IPA_TOP - unknown, - IPA_BOTTOM - non constant, - IPA_CONST_VALUE - simple scalar constant, - Cval of formal f will have a constant value if all callsites to this - function have the same constant value passed to f. - Integer and real constants are represented as IPA_CONST. */ -enum ipa_lattice_type +/* Structure holding data required to describe a pass-through jump function. */ + +struct GTY(()) ipa_pass_through_data { - IPA_BOTTOM, - IPA_CONST_VALUE, - IPA_TOP + /* If an operation is to be performed on the original parameter, this is the + second (constant) operand. */ + tree operand; + /* Number of the caller's formal parameter being passed. */ + int formal_id; + /* Operation that is performed on the argument before it is passed on. + NOP_EXPR means no operation. Otherwise oper must be a simple binary + arithmetic operation where the caller's parameter is the first operand and + operand field from this structure is the second one. */ + enum tree_code operation; +}; + +/* Structure holding data required to describe an ancestor pass-through + jump function. */ + +struct GTY(()) ipa_ancestor_jf_data +{ + /* Offset of the field representing the ancestor. */ + HOST_WIDE_INT offset; + /* TYpe of the result. */ + tree type; + /* Number of the caller's formal parameter being passed. */ + int formal_id; }; /* Structure holding a C++ member pointer constant. Holds a pointer to the method and delta offset. */ -struct ipa_member_ptr_cst +struct GTY(()) ipa_member_ptr_cst { tree pfn; tree delta; }; -/* Represents a value of a jump function. formal_id is used only in jump - function context and represents pass-through parameter (the formal parameter - of the caller is passed as argument). constant represents the actual - constant in constant jump functions and member_cst holds constant c++ member - functions. */ -union jump_func_value -{ - unsigned int formal_id; - tree constant; - struct ipa_member_ptr_cst member_cst; -}; - /* A jump function for a callsite represents the values passed as actual arguments of the callsite. See enum jump_func_type for the various types of jump functions supported. */ -struct ipa_jump_func +struct GTY (()) ipa_jump_func { enum jump_func_type type; - union jump_func_value value; + /* Represents a value of a jump function. pass_through is used only in jump + function context. constant represents the actual constant in constant jump + functions and member_cst holds constant c++ member functions. */ + union jump_func_value + { + tree GTY ((tag ("IPA_JF_KNOWN_TYPE"))) base_binfo; + tree GTY ((tag ("IPA_JF_CONST"))) constant; + struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst; + struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through; + struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor; + } GTY ((desc ("%1.type"))) value; +}; + +/* All formal parameters in the program have a lattice associated with it + computed by the interprocedural stage of IPCP. + There are three main values of the lattice: + IPA_TOP - unknown, + IPA_BOTTOM - variable, + IPA_CONST_VALUE - simple scalar constant, + + We also use this type to propagate types accross the call graph for the + purpose of devirtualization. In that case, IPA_CONST_VALUE denotes a known + type, rather than a constant. */ +enum ipa_lattice_type +{ + IPA_BOTTOM, + IPA_CONST_VALUE, + IPA_TOP }; /* All formal parameters in the program have a cval computed by @@ -96,44 +156,6 @@ struct ipcp_lattice tree constant; }; -/* Represent which DECL tree (or reference to such tree) - will be replaced by another tree while versioning. */ -struct ipa_replace_map -{ - /* The tree that will be replaced. */ - tree old_tree; - /* The new (replacing) tree. */ - tree new_tree; - /* True when a substitution should be done, false otherwise. */ - bool replace_p; - /* True when we replace a reference to old_tree. */ - bool ref_p; -}; - -/* Each instance of the following structure describes a statement that calls a - function parameter. Those referring to statements within the same function - are linked in a list. */ -struct ipa_param_call_note -{ - /* Linked list's next */ - struct ipa_param_call_note *next; - /* Statement that contains the call to the parameter above. */ - gimple stmt; - /* Index of the parameter that is called. */ - unsigned int formal_id; - /* Expected number of executions: calculated in profile.c. */ - gcov_type count; - /* Expected frequency of executions within the function. see cgraph_edge in - cgraph.h for more on this. */ - int frequency; - /* Depth of loop nest, 1 means no loop nest. */ - int loop_nest; - /* Set when we have already found the target to be a compile time constant - and turned this into an edge or when the note was found unusable for some - reason. */ - bool processed; -}; - /* Structure describing a single formal parameter. */ struct ipa_param_descriptor { @@ -141,10 +163,14 @@ struct ipa_param_descriptor struct ipcp_lattice ipcp_lattice; /* PARAM_DECL of this parameter. */ tree decl; - /* Whether the value parameter has been modified within the function. */ - unsigned modified : 1; - /* Whether the parameter has been used as a call destination. */ - unsigned called : 1; + /* Vector of BINFOs of types that this argument might encounter. NULL + basically means a top value, bottom is marked by the cannot_devirtualize + flag below.*/ + VEC (tree, heap) *types; + /* The parameter is used. */ + unsigned used : 1; + /* Set when parameter type cannot be used for devirtualization. */ + unsigned cannot_devirtualize : 1; }; /* ipa_node_params stores information related to formal parameters of functions @@ -152,15 +178,19 @@ struct ipa_param_descriptor parameters (such as ipa-cp). */ struct ipa_node_params { - /* Number of formal parameters of this function. When set to 0, - this function's parameters would not be analyzed by the different - stages of IPA CP. */ + /* Number of formal parameters of this function. When set to 0, this + function's parameters would not be analyzed by IPA CP. */ int param_count; + /* Whether this function is called with variable number of actual + arguments. */ + unsigned called_with_var_arguments : 1; + /* Whether the param uses analysis has already been performed. */ + unsigned uses_analysis_done : 1; + /* Whether the function is enqueued in an ipa_func_list. */ + unsigned node_enqueued : 1; /* Pointer to an array of structures describing individual formal parameters. */ struct ipa_param_descriptor *params; - /* List of structures enumerating calls to a formal parameter. */ - struct ipa_param_call_note *param_calls; /* Only for versioned nodes this field would not be NULL, it points to the node that IPA cp cloned from. */ struct cgraph_node *ipcp_orig_node; @@ -170,14 +200,6 @@ struct ipa_node_params the profiling information of the original function and the versioned one. */ gcov_type count_scale; - - /* Whether this function is called with variable number of actual - arguments. */ - unsigned called_with_var_arguments : 1; - /* Whether the modification analysis has already been performed. */ - unsigned modification_analysis_done : 1; - /* Whether the param uses analysis has already been performed. */ - unsigned uses_analysis_done : 1; }; /* ipa_node_params access functions. Please use these to access fields that @@ -209,26 +231,32 @@ ipa_get_param (struct ipa_node_params *info, int i) return info->params[i].decl; } -/* Return the modification flag corresponding to the Ith formal parameter of - the function associated with INFO. Note that there is no setter method as - the goal is to set all flags when building the array in - ipa_detect_param_modifications. */ +/* Return the used flag corresponding to the Ith formal parameter of + the function associated with INFO. */ static inline bool -ipa_is_param_modified (struct ipa_node_params *info, int i) +ipa_is_param_used (struct ipa_node_params *info, int i) { - return info->params[i].modified; + return info->params[i].used; } -/* Return the called flag corresponding to the Ith formal parameter of the - function associated with INFO. Note that there is no setter method as the - goal is to set all flags when building the array in - ipa_detect_called_params. */ +/* Return the cannot_devirtualize flag corresponding to the Ith formal + parameter of the function associated with INFO. The corresponding function + to set the flag is ipa_set_param_cannot_devirtualize. */ static inline bool -ipa_is_param_called (struct ipa_node_params *info, int i) +ipa_param_cannot_devirtualize_p (struct ipa_node_params *info, int i) { - return info->params[i].called; + return info->params[i].cannot_devirtualize; +} + +/* Return true iff the vector of possible types of the Ith formal parameter of + the function associated with INFO is empty. */ + +static inline bool +ipa_param_types_vec_empty (struct ipa_node_params *info, int i) +{ + return info->params[i].types == NULL; } /* Flag this node as having callers with variable number of arguments. */ @@ -249,18 +277,17 @@ ipa_is_called_with_var_arguments (struct ipa_node_params *info) -/* ipa_edge_args stores information related to a callsite and particularly - its arguments. It is pointed to by a field in the - callsite's corresponding cgraph_edge. */ -struct ipa_edge_args +/* ipa_edge_args stores information related to a callsite and particularly its + arguments. It can be accessed by the IPA_EDGE_REF macro. */ +typedef struct GTY(()) ipa_edge_args { /* Number of actual arguments in this callsite. When set to 0, this callsite's parameters would not be analyzed by the different stages of IPA CP. */ int argument_count; /* Array of the callsite's jump function of each parameter. */ - struct ipa_jump_func *jump_functions; -}; + struct ipa_jump_func GTY ((length ("%h.argument_count"))) *jump_functions; +} ipa_edge_args_t; /* ipa_edge_args access functions. Please use these to access fields that are or will be shared among various passes. */ @@ -293,18 +320,17 @@ ipa_get_ith_jump_func (struct ipa_edge_args *args, int i) /* Vectors need to have typedefs of structures. */ typedef struct ipa_node_params ipa_node_params_t; -typedef struct ipa_edge_args ipa_edge_args_t; /* Types of vectors holding the infos. */ DEF_VEC_O (ipa_node_params_t); DEF_VEC_ALLOC_O (ipa_node_params_t, heap); DEF_VEC_O (ipa_edge_args_t); -DEF_VEC_ALLOC_O (ipa_edge_args_t, heap); +DEF_VEC_ALLOC_O (ipa_edge_args_t, gc); /* Vector where the parameter infos are actually stored. */ extern VEC (ipa_node_params_t, heap) *ipa_node_params_vector; /* Vector where the parameter infos are actually stored. */ -extern VEC (ipa_edge_args_t, heap) *ipa_edge_args_vector; +extern GTY(()) VEC (ipa_edge_args_t, gc) *ipa_edge_args_vector; /* Return the associated parameter/argument info corresponding to the given node/edge. */ @@ -323,8 +349,9 @@ void ipa_free_edge_args_substructures (struct ipa_edge_args *); void ipa_free_node_params_substructures (struct ipa_node_params *); void ipa_free_all_node_params (void); void ipa_free_all_edge_args (void); -void free_all_ipa_structures_after_ipa_cp (void); -void free_all_ipa_structures_after_iinln (void); +void ipa_create_all_structures_for_iinln (void); +void ipa_free_all_structures_after_ipa_cp (void); +void ipa_free_all_structures_after_iinln (void); void ipa_register_cgraph_hooks (void); /* This function ensures the array of node param infos is big enough to @@ -350,12 +377,12 @@ static inline void ipa_check_create_edge_args (void) { if (!ipa_edge_args_vector) - ipa_edge_args_vector = VEC_alloc (ipa_edge_args_t, heap, + ipa_edge_args_vector = VEC_alloc (ipa_edge_args_t, gc, cgraph_edge_max_uid); if (VEC_length (ipa_edge_args_t, ipa_edge_args_vector) <= (unsigned) cgraph_edge_max_uid) - VEC_safe_grow_cleared (ipa_edge_args_t, heap, ipa_edge_args_vector, + VEC_safe_grow_cleared (ipa_edge_args_t, gc, ipa_edge_args_vector, cgraph_edge_max_uid + 1); } @@ -380,24 +407,117 @@ struct ipa_func_list /* ipa_func_list interface. */ struct ipa_func_list *ipa_init_func_list (void); -void ipa_push_func_to_list (struct ipa_func_list **, struct cgraph_node *); +void ipa_push_func_to_list_1 (struct ipa_func_list **, struct cgraph_node *, + struct ipa_node_params *); struct cgraph_node *ipa_pop_func_from_list (struct ipa_func_list **); -/* Callsite related calculations. */ -void ipa_compute_jump_functions (struct cgraph_edge *); -void ipa_count_arguments (struct cgraph_edge *); +/* Add cgraph NODE to the worklist WL if it is not already in one. */ + +static inline void +ipa_push_func_to_list (struct ipa_func_list **wl, struct cgraph_node *node) +{ + struct ipa_node_params *info = IPA_NODE_REF (node); + + if (!info->node_enqueued) + ipa_push_func_to_list_1 (wl, node, info); +} + +void ipa_analyze_node (struct cgraph_node *); /* Function formal parameters related computations. */ void ipa_initialize_node_params (struct cgraph_node *node); -void ipa_detect_param_modifications (struct cgraph_node *); -void ipa_analyze_params_uses (struct cgraph_node *); bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs, VEC (cgraph_edge_p, heap) **new_edges); +/* Indirect edge and binfo processing. */ +struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree, + tree); + + /* Debugging interface. */ void ipa_print_node_params (FILE *, struct cgraph_node *node); void ipa_print_all_params (FILE *); void ipa_print_node_jump_functions (FILE *f, struct cgraph_node *node); void ipa_print_all_jump_functions (FILE * f); +/* Structure to describe transformations of formal parameters and actual + arguments. Each instance describes one new parameter and they are meant to + be stored in a vector. Additionally, most users will probably want to store + adjustments about parameters that are being removed altogether so that SSA + names belonging to them can be replaced by SSA names of an artificial + variable. */ +struct ipa_parm_adjustment +{ + /* The original PARM_DECL itself, helpful for processing of the body of the + function itself. Intended for traversing function bodies. + ipa_modify_formal_parameters, ipa_modify_call_arguments and + ipa_combine_adjustments ignore this and use base_index. + ipa_modify_formal_parameters actually sets this. */ + tree base; + + /* Type of the new parameter. However, if by_ref is true, the real type will + be a pointer to this type. */ + tree type; + + /* Alias refrerence type to be used in MEM_REFs when adjusting caller + arguments. */ + tree alias_ptr_type; + + /* The new declaration when creating/replacing a parameter. Created by + ipa_modify_formal_parameters, useful for functions modifying the body + accordingly. */ + tree reduction; + + /* New declaration of a substitute variable that we may use to replace all + non-default-def ssa names when a parm decl is going away. */ + tree new_ssa_base; + + /* If non-NULL and the original parameter is to be removed (copy_param below + is NULL), this is going to be its nonlocalized vars value. */ + tree nonlocal_value; + + /* Offset into the original parameter (for the cases when the new parameter + is a component of an original one). */ + HOST_WIDE_INT offset; + + /* Zero based index of the original parameter this one is based on. (ATM + there is no way to insert a new parameter out of the blue because there is + no need but if it arises the code can be easily exteded to do so.) */ + int base_index; + + /* This new parameter is an unmodified parameter at index base_index. */ + unsigned copy_param : 1; + + /* This adjustment describes a parameter that is about to be removed + completely. Most users will probably need to book keep those so that they + don't leave behinfd any non default def ssa names belonging to them. */ + unsigned remove_param : 1; + + /* The parameter is to be passed by reference. */ + unsigned by_ref : 1; +}; + +typedef struct ipa_parm_adjustment ipa_parm_adjustment_t; +DEF_VEC_O (ipa_parm_adjustment_t); +DEF_VEC_ALLOC_O (ipa_parm_adjustment_t, heap); + +typedef VEC (ipa_parm_adjustment_t, heap) *ipa_parm_adjustment_vec; + +VEC(tree, heap) *ipa_get_vector_of_formal_parms (tree fndecl); +void ipa_modify_formal_parameters (tree fndecl, ipa_parm_adjustment_vec, + const char *); +void ipa_modify_call_arguments (struct cgraph_edge *, gimple, + ipa_parm_adjustment_vec); +ipa_parm_adjustment_vec ipa_combine_adjustments (ipa_parm_adjustment_vec, + ipa_parm_adjustment_vec); +void ipa_dump_param_adjustments (FILE *, ipa_parm_adjustment_vec, tree); + +void ipa_prop_write_jump_functions (cgraph_node_set set); +void ipa_prop_read_jump_functions (void); +void ipa_update_after_lto_read (void); + +/* From tree-sra.c: */ +tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree, + gimple_stmt_iterator *, bool); + #endif /* IPA_PROP_H */