/* 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.
#include "tree.h"
#include "vec.h"
#include "cgraph.h"
+#include "gimple.h"
/* The following definitions and interfaces are used by
interprocedural analyses or parameters. */
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. 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
-};
-
-/* 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
-{
- IPA_BOTTOM,
- IPA_CONST_VALUE,
- IPA_TOP
+ 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 */
};
-
/* 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
{
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;
- struct ipa_member_ptr_cst GTY ((tag ("IPA_JF_CONST_MEMBER_PTR"))) member_cst;
} 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
the interprocedural stage of IPCP. See enum ipa_lattice_type for
the various types of lattices supported */
tree constant;
};
-/* 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. */
- 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
{
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
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;
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;
- /* Whether the function is enqueued in an ipa_func_list. */
- unsigned node_enqueued : 1;
};
/* ipa_node_params access functions. Please use these to access fields that
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. */
-/* 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,
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
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 *);
+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);
+
+
/* Debugging interface. */
void ipa_print_node_params (FILE *, struct cgraph_node *node);
void ipa_print_all_params (FILE *);
void ipa_update_after_lto_read (void);
/* 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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