/* 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 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 :
+ 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.
argument.
Unknown - neither of the above.
- IPA_JF_CONST_MEMBER_PTR stands for C++ member pointers, other constants are
- represented with IPA_JF_CONST.
+ 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. */
- In addition to "ordinary" pass through functions represented by
- IPA_JF_PASS_THROUGH, IPA_JF_ANCESTOR represents getting addresses of of
- ancestor fields in C++ (e.g. &this_1(D)->D.1766.D.1756). */
enum jump_func_type
{
IPA_JF_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */
- IPA_JF_CONST,
- IPA_JF_CONST_MEMBER_PTR,
- IPA_JF_PASS_THROUGH,
- IPA_JF_ANCESTOR
+ 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_VALUE. */
-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 data required to describe a pass-through jump function. */
struct GTY(()) ipa_pass_through_data
enum tree_code operation;
};
-/* Structure holding data required to describe and ancestor pass throu
- funkci. */
+/* Structure holding data required to describe an ancestor pass-through
+ jump function. */
struct GTY(()) ipa_ancestor_jf_data
{
/* 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 GTY (()) ipa_jump_func
+typedef struct GTY (()) ipa_jump_func
{
enum jump_func_type type;
/* Represents a value of a jump function. pass_through is used only in 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;
- struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst;
} GTY ((desc ("%1.type"))) value;
-};
+} ipa_jump_func_t;
-/* 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
-{
- enum ipa_lattice_type type;
- tree constant;
-};
+DEF_VEC_O (ipa_jump_func_t);
+DEF_VEC_ALLOC_O (ipa_jump_func_t, gc);
-/* 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;
- /* When in LTO, we the above stmt will be NULL and we need an uid. */
- unsigned int lto_stmt_uid;
- /* Index of the parameter that is called. */
- 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;
-};
+/* Summary describing a single formal parameter. */
-/* Structure describing a single formal parameter. */
struct ipa_param_descriptor
{
- /* IPA-CP lattice. */
- 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;
+ /* 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;
+ /* 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 ipa_param_descriptor *params;
- /* List of structures enumerating calls to a formal parameter. */
- struct ipa_param_call_note *param_calls;
+ 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 an ipa_func_list. */
+ /* 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);
}
/* Return the declaration of Ith formal parameter of the function corresponding
static inline tree
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. */
-
-static inline bool
-ipa_is_param_modified (struct ipa_node_params *info, int i)
-{
- return info->params[i].modified;
-}
-
-/* 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. */
-
-static inline bool
-ipa_is_param_called (struct ipa_node_params *info, int i)
-{
- return info->params[i].called;
+ return VEC_index (ipa_param_descriptor_t, info->descriptors, i)->decl;
}
-/* Flag this node as having callers with variable number of arguments. */
+/* Set the used flag corresponding to the Ith formal parameter of the function
+ associated with INFO to VAL. */
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. */
+/* 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 GTY ((length ("%h.argument_count"))) *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
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. */
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
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_1 (struct ipa_func_list **, struct cgraph_node *,
- struct ipa_node_params *);
-struct cgraph_node *ipa_pop_func_from_list (struct ipa_func_list **);
-
-/* 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);
-}
-
-/* Callsite related calculations. */
-void ipa_compute_jump_functions (struct cgraph_edge *);
-void ipa_count_arguments (struct cgraph_edge *);
-
/* 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. */
+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);
+
+/* Functions related to both. */
+void ipa_analyze_node (struct cgraph_node *);
+
/* 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);
+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 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. */
void ipa_prop_write_jump_functions (cgraph_node_set set);
void ipa_prop_read_jump_functions (void);
void ipa_update_after_lto_read (void);
-void lto_ipa_fixup_call_notes (struct cgraph_node *, gimple *);
+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: */
-bool build_ref_for_offset (tree *, tree, HOST_WIDE_INT, tree, bool);
+tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
+ gimple_stmt_iterator *, bool);
#endif /* IPA_PROP_H */
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