/* Interprocedural analyses.
- Copyright (C) 2005, 2007, 2008 Free Software Foundation, Inc.
+ Copyright (C) 2005, 2007, 2008, 2009, 2010
+ Free Software Foundation, Inc.
This file is part of GCC.
#include "tree.h"
#include "vec.h"
#include "cgraph.h"
+#include "gimple.h"
+#include "alloc-pool.h"
/* The following definitions and interfaces are used by
- interprocedural analyses. */
-
-/* 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. */
+ 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. They were originally proposed in a paper called
+ "Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
+ Ken Kennedy, Linda Torczon in Comp86, pg 152-161. There are three main
+ types of values :
+
+ 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 because it is in fact a structure consisting of two
+ values. 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 known_type */
+ 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 known type jump function. */
+struct GTY(()) ipa_known_type_data
{
- IPA_BOTTOM,
- IPA_CONST_VALUE,
- IPA_TOP
+ /* Offset of the component of the base_type being described. */
+ HOST_WIDE_INT offset;
+ /* Type of the whole object. */
+ tree base_type;
+ /* Type of the component of the object that is being described. */
+ tree component_type;
};
-/* Structure holding a C++ member pointer constant. Holds a pointer to the
- method and delta offset. */
-struct ipa_member_ptr_cst
-{
- tree pfn;
- tree delta;
-};
+/* Structure holding data required to describe a pass-through jump function. */
-/* 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
+struct GTY(()) ipa_pass_through_data
{
- unsigned int formal_id;
- tree constant;
- struct ipa_member_ptr_cst member_cst;
+ /* 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;
};
-/* 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
-{
- enum jump_func_type type;
- union jump_func_value value;
-};
+/* Structure holding data required to describe an ancestor pass-through
+ jump function. */
-/* All formal parameters in the program have a cval computed by
- the interprocedural stage of IPCP. See enum ipa_lattice_type for
- the various types of lattices supported */
-struct ipcp_lattice
+struct GTY(()) ipa_ancestor_jf_data
{
- enum ipa_lattice_type type;
- tree constant;
+ /* 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;
};
-/* Represent which DECL tree (or reference to such tree)
- will be replaced by another tree while versioning. */
-struct ipa_replace_map
+/* Structure holding a C++ member pointer constant. Holds a pointer to the
+ method and delta offset. */
+struct GTY(()) ipa_member_ptr_cst
{
- /* 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;
+ tree pfn;
+ tree delta;
};
-/* ipa_param_flags contains various flags that describe how the associated
- parameter is treated within a function. */
-struct ipa_param_flags
+/* 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. */
+typedef struct GTY (()) ipa_jump_func
{
- /* 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;
-};
-
-/* 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
+ enum jump_func_type type;
+ /* 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
+ {
+ struct ipa_known_type_data GTY ((tag ("IPA_JF_KNOWN_TYPE"))) known_type;
+ 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;
+} ipa_jump_func_t;
+
+DEF_VEC_O (ipa_jump_func_t);
+DEF_VEC_ALLOC_O (ipa_jump_func_t, gc);
+
+/* Summary describing a single formal parameter. */
+
+struct ipa_param_descriptor
{
- /* 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;
+ /* PARAM_DECL of this parameter. */
+ tree decl;
+ /* The parameter is used. */
+ unsigned used : 1;
};
+typedef struct ipa_param_descriptor ipa_param_descriptor_t;
+DEF_VEC_O (ipa_param_descriptor_t);
+DEF_VEC_ALLOC_O (ipa_param_descriptor_t, heap);
+struct ipcp_lattice;
+
/* ipa_node_params stores information related to formal parameters of functions
and some other information for interprocedural passes that operate on
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. */
- int param_count;
- /* Array of lattices. */
- struct ipcp_lattice *ipcp_lattices;
- /* Mapping each parameter to its PARM_DECL tree. */
- tree *param_decls;
- /* Various flags describing individual parameters. */
- struct ipa_param_flags *param_flags;
- /* List of structures enumerating calls to a formal parameter. */
- struct ipa_param_call_note *param_calls;
+ /* Information about individual formal parameters that are gathered when
+ summaries are generated. */
+ VEC (ipa_param_descriptor_t, heap) *descriptors;
+ /* Pointer to an array of structures describing individual formal
+ parameters. */
+ struct ipcp_lattice *lattices;
/* 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;
- /* Meaningful only for original functions. Expresses the
- ratio between the direct calls and sum of all invocations of
- this function (given by profiling info). It is used to calculate
- 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;
+ /* If this node is an ipa-cp clone, these are the known values that describe
+ what it has been specialized for. */
+ VEC (tree, heap) *known_vals;
/* Whether the param uses analysis has already been performed. */
unsigned uses_analysis_done : 1;
+ /* Whether the function is enqueued in ipa-cp propagation stack. */
+ unsigned node_enqueued : 1;
+ /* Whether we should create a specialized version based on values that are
+ known to be constant in all contexts. */
+ unsigned clone_for_all_contexts : 1;
+ /* Node has been completely replaced by clones and will be removed after
+ ipa-cp is finished. */
+ unsigned node_dead : 1;
};
/* ipa_node_params access functions. Please use these to access fields that
are or will be shared among various passes. */
-/* Set the number of formal parameters. */
-static inline void
-ipa_set_param_count (struct ipa_node_params *info, int count)
-{
- info->param_count = count;
-}
-
/* Return the number of formal parameters. */
+
static inline int
ipa_get_param_count (struct ipa_node_params *info)
{
- return info->param_count;
+ return VEC_length (ipa_param_descriptor_t, info->descriptors);
}
-/* Returns the declaration of ith param of the corresponding node. Note there
- is no setter function as this array is built just once using
- ipa_create_param_decls_array. */
-static inline tree
-ipa_get_ith_param (struct ipa_node_params *info, int i)
-{
- return info->param_decls[i];
-}
+/* Return the declaration of Ith formal parameter of the function corresponding
+ to INFO. Note there is no setter function as this array is built just once
+ using ipa_initialize_node_params. */
-/* Returns the modification flag corresponding to the ith parameter. Note
- there is no setter method as the goal is to set all flags when building the
- array in ipa_detect_param_modifications. */
-static inline bool
-ipa_is_ith_param_modified (struct ipa_node_params *info, int i)
+static inline tree
+ipa_get_param (struct ipa_node_params *info, int i)
{
- return info->param_flags[i].modified;
+ return VEC_index (ipa_param_descriptor_t, info->descriptors, i)->decl;
}
-/* Returns the called flag corresponding o the ith paramterer. Note there is
- no setter method as the goal is to set all flags when building the array in
- ipa_detect_called_params. */
-static inline bool
-ipa_is_ith_param_called (struct ipa_node_params *info, int i)
-{
- return info->param_flags[i].called;
-}
+/* Set the used flag corresponding to the Ith formal parameter of the function
+ associated with INFO to VAL. */
-/* Flag this node as having callers with variable number of arguments. */
static inline void
-ipa_set_called_with_variable_arg (struct ipa_node_params *info)
+ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
{
- info->called_with_var_arguments = 1;
+ VEC_index (ipa_param_descriptor_t, info->descriptors, i)->used = val;
}
-/* Have we detected this node was called with variable number of arguments? */
+/* Return the used flag corresponding to the Ith formal parameter of the
+ function associated with INFO. */
+
static inline bool
-ipa_is_called_with_var_arguments (struct ipa_node_params *info)
+ipa_is_param_used (struct ipa_node_params *info, int i)
{
- return info->called_with_var_arguments;
+ return VEC_index (ipa_param_descriptor_t, info->descriptors, i)->used;
}
-
-
-/* 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;
-};
+ /* Vector of the callsite's jump function of each parameter. */
+ VEC (ipa_jump_func_t, gc) *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. */
-/* Set the number of actual arguments. */
-static inline void
-ipa_set_cs_argument_count (struct ipa_edge_args *args, int count)
-{
- args->argument_count = count;
-}
-
/* Return the number of actual arguments. */
+
static inline int
ipa_get_cs_argument_count (struct ipa_edge_args *args)
{
- return args->argument_count;
+ return VEC_length (ipa_jump_func_t, args->jump_functions);
}
/* Returns a pointer to the jump function for the ith argument. Please note
there is no setter function as jump functions are all set up in
ipa_compute_jump_functions. */
+
static inline struct ipa_jump_func *
ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
{
- return &args->jump_functions[i];
+ return VEC_index (ipa_jump_func_t, args->jump_functions, 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 hodling the infos. */
+/* 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. */
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_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
- accomdate a structure for all nodes and realloacates it if not. */
+ accommodate a structure for all nodes and reallocates it if not. */
+
static inline void
ipa_check_create_node_params (void)
{
ipa_node_params_vector, cgraph_max_uid + 1);
}
-/* This function ensures the array of adge arguments infos is big enough to
- accomdate a structure for all edges and realloacates it if not. */
+/* This function ensures the array of edge arguments infos is big enough to
+ accommodate a structure for all edges and reallocates it if not. */
+
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);
}
-/* Returns true if the array of edge infos is large enough to accomodate an
+/* Returns true if the array of edge infos is large enough to accommodate an
info for EDGE. The main purpose of this function is that debug dumping
function can check info availability without causing reallocations. */
+
static inline bool
ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
{
ipa_edge_args_vector));
}
-/* A function list element. It is used to create a temporary worklist used in
- the propagation stage of IPCP. (can be used for more IPA optimizations) */
-struct ipa_func_list
-{
- struct cgraph_node *node;
- struct ipa_func_list *next;
-};
-
-/* 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 *);
-struct cgraph_node *ipa_pop_func_from_list (struct ipa_func_list **);
+/* Function formal parameters related computations. */
+void ipa_initialize_node_params (struct cgraph_node *node);
+bool ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
+ VEC (cgraph_edge_p, heap) **new_edges);
-/* Callsite related calculations. */
-void ipa_compute_jump_functions (struct cgraph_edge *);
-void ipa_count_arguments (struct cgraph_edge *);
+/* Indirect edge and binfo processing. */
+tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
+ VEC (tree, heap) *known_csts,
+ VEC (tree, heap) *known_binfs);
+struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree);
-/* Function parameters related computations. */
-void ipa_count_formal_params (struct cgraph_node *);
-void ipa_create_param_decls_array (struct cgraph_node *);
-void ipa_detect_param_modifications (struct cgraph_node *);
-void ipa_analyze_params_uses (struct cgraph_node *);
-void ipa_propagate_indirect_call_infos (struct cgraph_edge *cs,
- VEC (cgraph_edge_p, heap) *new_edges);
+/* Functions related to both. */
+void ipa_analyze_node (struct cgraph_node *);
/* Debugging interface. */
-void ipa_print_all_tree_maps (FILE *);
-void ipa_print_node_param_flags (FILE * f, struct cgraph_node *node);
-void ipa_print_all_param_flags (FILE *);
+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);
+void ipcp_verify_propagated_values (void);
+
+extern alloc_pool ipcp_values_pool;
+extern alloc_pool ipcp_sources_pool;
+
+/* 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);
+int ipa_get_param_decl_index (struct ipa_node_params *, tree);
+tree ipa_value_from_jfunc (struct ipa_node_params *info,
+ struct ipa_jump_func *jfunc);
+
+
+/* From tree-sra.c: */
+tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
+ gimple_stmt_iterator *, bool);
#endif /* IPA_PROP_H */
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