620 lines
22 KiB
C
620 lines
22 KiB
C
/* Interprocedural analyses.
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Copyright (C) 2005-2013 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef IPA_PROP_H
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#define IPA_PROP_H
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#include "tree.h"
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#include "vec.h"
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#include "cgraph.h"
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#include "gimple.h"
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#include "alloc-pool.h"
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/* The following definitions and interfaces are used by
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interprocedural analyses or parameters. */
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/* ipa-prop.c stuff (ipa-cp, indirect inlining): */
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/* A jump function for a callsite represents the values passed as actual
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arguments of the callsite. They were originally proposed in a paper called
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"Interprocedural Constant Propagation", by David Callahan, Keith D Cooper,
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Ken Kennedy, Linda Torczon in Comp86, pg 152-161. There are three main
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types of values :
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Pass-through - the caller's formal parameter is passed as an actual
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argument, possibly one simple operation performed on it.
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Constant - a constant (is_gimple_ip_invariant)is passed as an actual
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argument.
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Unknown - neither of the above.
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IPA_JF_ANCESTOR is a special pass-through jump function, which means that
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the result is an address of a part of the object pointed to by the formal
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parameter to which the function refers. It is mainly intended to represent
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getting addresses of of ancestor fields in C++
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(e.g. &this_1(D)->D.1766.D.1756). Note that if the original pointer is
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NULL, ancestor jump function must behave like a simple pass-through.
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Other pass-through functions can either simply pass on an unchanged formal
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parameter or can apply one simple binary operation to it (such jump
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functions are called polynomial).
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IPA_JF_KNOWN_TYPE is a special type of an "unknown" function that applies
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only to pointer parameters. It means that even though we cannot prove that
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the passed value is an interprocedural constant, we still know the exact
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type of the containing object which may be valuable for devirtualization.
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Jump functions are computed in ipa-prop.c by function
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update_call_notes_after_inlining. Some information can be lost and jump
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functions degraded accordingly when inlining, see
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update_call_notes_after_inlining in the same file. */
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enum jump_func_type
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{
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IPA_JF_UNKNOWN = 0, /* newly allocated and zeroed jump functions default */
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IPA_JF_KNOWN_TYPE, /* represented by field known_type */
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IPA_JF_CONST, /* represented by field costant */
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IPA_JF_PASS_THROUGH, /* represented by field pass_through */
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IPA_JF_ANCESTOR /* represented by field ancestor */
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};
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/* Structure holding data required to describe a known type jump function. */
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struct GTY(()) ipa_known_type_data
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{
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/* Offset of the component of the base_type being described. */
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HOST_WIDE_INT offset;
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/* Type of the whole object. */
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tree base_type;
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/* Type of the component of the object that is being described. */
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tree component_type;
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};
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/* Structure holding data required to describe a pass-through jump function. */
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struct GTY(()) ipa_pass_through_data
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{
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/* If an operation is to be performed on the original parameter, this is the
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second (constant) operand. */
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tree operand;
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/* Number of the caller's formal parameter being passed. */
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int formal_id;
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/* Operation that is performed on the argument before it is passed on.
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NOP_EXPR means no operation. Otherwise oper must be a simple binary
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arithmetic operation where the caller's parameter is the first operand and
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operand field from this structure is the second one. */
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enum tree_code operation;
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/* When the passed value is a pointer, it is set to true only when we are
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certain that no write to the object it points to has occurred since the
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caller functions started execution, except for changes noted in the
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aggregate part of the jump function (see description of
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ipa_agg_jump_function). The flag is used only when the operation is
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NOP_EXPR. */
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bool agg_preserved;
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};
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/* Structure holding data required to describe an ancestor pass-through
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jump function. */
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struct GTY(()) ipa_ancestor_jf_data
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{
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/* Offset of the field representing the ancestor. */
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HOST_WIDE_INT offset;
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/* Type of the result. */
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tree type;
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/* Number of the caller's formal parameter being passed. */
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int formal_id;
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/* Flag with the same meaning like agg_preserve in ipa_pass_through_data. */
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bool agg_preserved;
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};
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/* An element in an aggegate part of a jump function describing a known value
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at a given offset. When it is part of a pass-through jump function with
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agg_preserved set or an ancestor jump function with agg_preserved set, all
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unlisted positions are assumed to be preserved but the value can be a type
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node, which means that the particular piece (starting at offset and having
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the size of the type) is clobbered with an unknown value. When
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agg_preserved is false or the type of the containing jump function is
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different, all unlisted parts are assumed to be unknown and all values must
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fullfill is_gimple_ip_invariant. */
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typedef struct GTY(()) ipa_agg_jf_item
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{
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/* The offset at which the known value is located within the aggregate. */
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HOST_WIDE_INT offset;
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/* The known constant or type if this is a clobber. */
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tree value;
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} ipa_agg_jf_item_t;
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/* Aggregate jump function - i.e. description of contents of aggregates passed
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either by reference or value. */
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struct GTY(()) ipa_agg_jump_function
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{
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/* Description of the individual items. */
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vec<ipa_agg_jf_item_t, va_gc> *items;
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/* True if the data was passed by reference (as opposed to by value). */
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bool by_ref;
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};
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typedef struct ipa_agg_jump_function *ipa_agg_jump_function_p;
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typedef struct ipa_agg_jump_function ipa_agg_jump_function_t;
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/* A jump function for a callsite represents the values passed as actual
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arguments of the callsite. See enum jump_func_type for the various
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types of jump functions supported. */
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typedef struct GTY (()) ipa_jump_func
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{
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/* Aggregate contants description. See struct ipa_agg_jump_function and its
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description. */
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struct ipa_agg_jump_function agg;
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enum jump_func_type type;
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/* Represents a value of a jump function. pass_through is used only in jump
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function context. constant represents the actual constant in constant jump
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functions and member_cst holds constant c++ member functions. */
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union jump_func_value
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{
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struct ipa_known_type_data GTY ((tag ("IPA_JF_KNOWN_TYPE"))) known_type;
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tree GTY ((tag ("IPA_JF_CONST"))) constant;
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struct ipa_pass_through_data GTY ((tag ("IPA_JF_PASS_THROUGH"))) pass_through;
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struct ipa_ancestor_jf_data GTY ((tag ("IPA_JF_ANCESTOR"))) ancestor;
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} GTY ((desc ("%1.type"))) value;
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} ipa_jump_func_t;
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/* Return the offset of the component that is decribed by a known type jump
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function JFUNC. */
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static inline HOST_WIDE_INT
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ipa_get_jf_known_type_offset (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
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return jfunc->value.known_type.offset;
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}
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/* Return the base type of a known type jump function JFUNC. */
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static inline tree
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ipa_get_jf_known_type_base_type (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
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return jfunc->value.known_type.base_type;
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}
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/* Return the component type of a known type jump function JFUNC. */
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static inline tree
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ipa_get_jf_known_type_component_type (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_KNOWN_TYPE);
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return jfunc->value.known_type.component_type;
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}
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/* Return the constant stored in a constant jump functin JFUNC. */
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static inline tree
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ipa_get_jf_constant (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_CONST);
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return jfunc->value.constant;
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}
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/* Return the operand of a pass through jmp function JFUNC. */
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static inline tree
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ipa_get_jf_pass_through_operand (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
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return jfunc->value.pass_through.operand;
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}
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/* Return the number of the caller's formal parameter that a pass through jump
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function JFUNC refers to. */
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static inline int
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ipa_get_jf_pass_through_formal_id (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
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return jfunc->value.pass_through.formal_id;
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}
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/* Return operation of a pass through jump function JFUNC. */
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static inline enum tree_code
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ipa_get_jf_pass_through_operation (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
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return jfunc->value.pass_through.operation;
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}
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/* Return the agg_preserved flag of a pass through jump functin JFUNC. */
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static inline bool
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ipa_get_jf_pass_through_agg_preserved (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
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return jfunc->value.pass_through.agg_preserved;
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}
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/* Return the offset of an ancestor jump function JFUNC. */
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static inline HOST_WIDE_INT
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ipa_get_jf_ancestor_offset (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
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return jfunc->value.ancestor.offset;
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}
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/* Return the result type of an ancestor jump function JFUNC. */
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static inline tree
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ipa_get_jf_ancestor_type (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
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return jfunc->value.ancestor.type;
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}
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/* Return the number of the caller's formal parameter that an ancestor jump
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function JFUNC refers to. */
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static inline int
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ipa_get_jf_ancestor_formal_id (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
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return jfunc->value.ancestor.formal_id;
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}
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/* Return the agg_preserved flag of an ancestor jump functin JFUNC. */
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static inline bool
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ipa_get_jf_ancestor_agg_preserved (struct ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_ANCESTOR);
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return jfunc->value.ancestor.agg_preserved;
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}
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/* Summary describing a single formal parameter. */
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struct ipa_param_descriptor
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{
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/* PARAM_DECL of this parameter. */
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tree decl;
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/* The parameter is used. */
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unsigned used : 1;
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};
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typedef struct ipa_param_descriptor ipa_param_descriptor_t;
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struct ipcp_lattice;
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/* ipa_node_params stores information related to formal parameters of functions
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and some other information for interprocedural passes that operate on
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parameters (such as ipa-cp). */
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struct ipa_node_params
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{
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/* Information about individual formal parameters that are gathered when
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summaries are generated. */
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vec<ipa_param_descriptor_t> descriptors;
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/* Pointer to an array of structures describing individual formal
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parameters. */
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struct ipcp_param_lattices *lattices;
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/* Only for versioned nodes this field would not be NULL,
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it points to the node that IPA cp cloned from. */
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struct cgraph_node *ipcp_orig_node;
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/* If this node is an ipa-cp clone, these are the known values that describe
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what it has been specialized for. */
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vec<tree> known_vals;
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/* Whether the param uses analysis has already been performed. */
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unsigned uses_analysis_done : 1;
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/* Whether the function is enqueued in ipa-cp propagation stack. */
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unsigned node_enqueued : 1;
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/* Whether we should create a specialized version based on values that are
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known to be constant in all contexts. */
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unsigned do_clone_for_all_contexts : 1;
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/* Set if this is an IPA-CP clone for all contexts. */
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unsigned is_all_contexts_clone : 1;
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/* Node has been completely replaced by clones and will be removed after
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ipa-cp is finished. */
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unsigned node_dead : 1;
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};
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/* ipa_node_params access functions. Please use these to access fields that
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are or will be shared among various passes. */
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/* Return the number of formal parameters. */
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static inline int
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ipa_get_param_count (struct ipa_node_params *info)
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{
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return info->descriptors.length ();
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}
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/* Return the declaration of Ith formal parameter of the function corresponding
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to INFO. Note there is no setter function as this array is built just once
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using ipa_initialize_node_params. */
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static inline tree
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ipa_get_param (struct ipa_node_params *info, int i)
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{
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return info->descriptors[i].decl;
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}
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/* Set the used flag corresponding to the Ith formal parameter of the function
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associated with INFO to VAL. */
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static inline void
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ipa_set_param_used (struct ipa_node_params *info, int i, bool val)
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{
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info->descriptors[i].used = val;
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}
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/* Return the used flag corresponding to the Ith formal parameter of the
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function associated with INFO. */
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static inline bool
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ipa_is_param_used (struct ipa_node_params *info, int i)
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{
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return info->descriptors[i].used;
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}
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/* Information about replacements done in aggregates for a given node (each
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node has its linked list). */
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struct GTY(()) ipa_agg_replacement_value
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{
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/* Next item in the linked list. */
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struct ipa_agg_replacement_value *next;
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/* Offset within the aggregate. */
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HOST_WIDE_INT offset;
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/* The constant value. */
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tree value;
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/* The paramter index. */
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int index;
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/* Whether the value was passed by reference. */
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bool by_ref;
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};
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typedef struct ipa_agg_replacement_value *ipa_agg_replacement_value_p;
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void ipa_set_node_agg_value_chain (struct cgraph_node *node,
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struct ipa_agg_replacement_value *aggvals);
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/* ipa_edge_args stores information related to a callsite and particularly its
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arguments. It can be accessed by the IPA_EDGE_REF macro. */
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typedef struct GTY(()) ipa_edge_args
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{
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/* Vector of the callsite's jump function of each parameter. */
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vec<ipa_jump_func_t, va_gc> *jump_functions;
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} ipa_edge_args_t;
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/* ipa_edge_args access functions. Please use these to access fields that
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are or will be shared among various passes. */
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/* Return the number of actual arguments. */
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static inline int
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ipa_get_cs_argument_count (struct ipa_edge_args *args)
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{
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return vec_safe_length (args->jump_functions);
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}
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/* Returns a pointer to the jump function for the ith argument. Please note
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there is no setter function as jump functions are all set up in
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ipa_compute_jump_functions. */
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static inline struct ipa_jump_func *
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ipa_get_ith_jump_func (struct ipa_edge_args *args, int i)
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{
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return &(*args->jump_functions)[i];
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}
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/* Vectors need to have typedefs of structures. */
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typedef struct ipa_node_params ipa_node_params_t;
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/* Types of vectors holding the infos. */
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/* Vector where the parameter infos are actually stored. */
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extern vec<ipa_node_params_t> ipa_node_params_vector;
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/* Vector of known aggregate values in cloned nodes. */
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extern GTY(()) vec<ipa_agg_replacement_value_p, va_gc> *ipa_node_agg_replacements;
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/* Vector where the parameter infos are actually stored. */
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extern GTY(()) vec<ipa_edge_args_t, va_gc> *ipa_edge_args_vector;
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/* Return the associated parameter/argument info corresponding to the given
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node/edge. */
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#define IPA_NODE_REF(NODE) (&ipa_node_params_vector[(NODE)->uid])
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#define IPA_EDGE_REF(EDGE) (&(*ipa_edge_args_vector)[(EDGE)->uid])
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/* This macro checks validity of index returned by
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ipa_get_param_decl_index function. */
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#define IS_VALID_JUMP_FUNC_INDEX(I) ((I) != -1)
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/* Creating and freeing ipa_node_params and ipa_edge_args. */
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void ipa_create_all_node_params (void);
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void ipa_create_all_edge_args (void);
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void ipa_free_edge_args_substructures (struct ipa_edge_args *);
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void ipa_free_node_params_substructures (struct ipa_node_params *);
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void ipa_free_all_node_params (void);
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void ipa_free_all_edge_args (void);
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void ipa_free_all_structures_after_ipa_cp (void);
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void ipa_free_all_structures_after_iinln (void);
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void ipa_register_cgraph_hooks (void);
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/* This function ensures the array of node param infos is big enough to
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accommodate a structure for all nodes and reallocates it if not. */
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static inline void
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ipa_check_create_node_params (void)
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{
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if (!ipa_node_params_vector.exists ())
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ipa_node_params_vector.create (cgraph_max_uid);
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if (ipa_node_params_vector.length () <= (unsigned) cgraph_max_uid)
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ipa_node_params_vector.safe_grow_cleared (cgraph_max_uid + 1);
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}
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/* This function ensures the array of edge arguments infos is big enough to
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accommodate a structure for all edges and reallocates it if not. */
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static inline void
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ipa_check_create_edge_args (void)
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{
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if (vec_safe_length (ipa_edge_args_vector) <= (unsigned) cgraph_edge_max_uid)
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vec_safe_grow_cleared (ipa_edge_args_vector, cgraph_edge_max_uid + 1);
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}
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/* 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)
|
|
{
|
|
return ((unsigned) edge->uid < vec_safe_length (ipa_edge_args_vector));
|
|
}
|
|
|
|
/* Return the aggregate replacements for NODE, if there are any. */
|
|
|
|
static inline struct ipa_agg_replacement_value *
|
|
ipa_get_agg_replacements_for_node (struct cgraph_node *node)
|
|
{
|
|
if ((unsigned) node->uid >= vec_safe_length (ipa_node_agg_replacements))
|
|
return NULL;
|
|
return (*ipa_node_agg_replacements)[node->uid];
|
|
}
|
|
|
|
/* 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> *new_edges);
|
|
|
|
/* Indirect edge and binfo processing. */
|
|
tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
|
|
vec<tree> ,
|
|
vec<tree> ,
|
|
vec<ipa_agg_jump_function_p> );
|
|
struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree);
|
|
|
|
/* Functions related to both. */
|
|
void ipa_analyze_node (struct cgraph_node *);
|
|
|
|
/* Aggregate jump function related functions. */
|
|
tree ipa_find_agg_cst_for_param (struct ipa_agg_jump_function *, HOST_WIDE_INT,
|
|
bool);
|
|
bool ipa_load_from_parm_agg (struct ipa_node_params *, gimple, tree, int *,
|
|
HOST_WIDE_INT *, bool *);
|
|
|
|
/* 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;
|
|
extern alloc_pool ipcp_agg_lattice_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;
|
|
|
|
typedef vec<ipa_parm_adjustment_t> ipa_parm_adjustment_vec;
|
|
|
|
vec<tree> 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_dump_agg_replacement_values (FILE *f,
|
|
struct ipa_agg_replacement_value *av);
|
|
void ipa_prop_write_jump_functions (void);
|
|
void ipa_prop_read_jump_functions (void);
|
|
void ipa_prop_write_all_agg_replacement (void);
|
|
void ipa_prop_read_all_agg_replacement (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);
|
|
unsigned int ipcp_transform_function (struct cgraph_node *node);
|
|
|
|
|
|
/* From tree-sra.c: */
|
|
tree build_ref_for_offset (location_t, tree, HOST_WIDE_INT, tree,
|
|
gimple_stmt_iterator *, bool);
|
|
|
|
#endif /* IPA_PROP_H */
|