/* 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.
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
+ 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_VALUE. */
-enum ipa_lattice_type
-{
- IPA_BOTTOM,
- IPA_CONST_VALUE,
- IPA_TOP
-};
-
-
/* Structure holding data required to describe a pass-through jump function. */
-struct ipa_pass_through_data
+struct GTY(()) ipa_pass_through_data
{
/* If an operation is to be performed on the original parameter, this is the
second (constant) operand. */
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 ipa_ancestor_jf_data
+struct GTY(()) ipa_ancestor_jf_data
{
/* Offset of the field representing the ancestor. */
HOST_WIDE_INT offset;
/* 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. 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 constant;
- struct ipa_pass_through_data pass_through;
- struct ipa_ancestor_jf_data ancestor;
- 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 - 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
};
/* All formal parameters in the program have a cval computed by
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
{
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;
};
/* ipa_node_params stores information related to formal parameters of functions
this function's parameters would not be analyzed by the different
stages of IPA CP. */
int param_count;
+ /* 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;
/* 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].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. */
+/* Return the used flag corresponding to the Ith formal parameter of
+ the function associated with INFO. */
static inline bool
-ipa_is_param_called (struct ipa_node_params *info, int i)
+ipa_is_param_used (struct ipa_node_params *info, int i)
{
- return info->params[i].called;
+ return info->params[i].used;
}
/* 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. */
-struct ipa_edge_args
+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. */
/* 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. */
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_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);
}
}
/* Callsite related calculations. */
-void ipa_compute_jump_functions (struct cgraph_edge *);
+void ipa_compute_jump_functions (struct cgraph_node *);
void ipa_count_arguments (struct cgraph_edge *);
/* Function formal parameters related computations. */
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: */
bool build_ref_for_offset (tree *, tree, HOST_WIDE_INT, tree, bool);
OSDN Git Service
