1205 lines
40 KiB
C++
1205 lines
40 KiB
C++
/* Interprocedural analyses.
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Copyright (C) 2005-2023 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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/* The following definitions and interfaces are used by
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interprocedural analyses or parameters. */
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#define IPA_UNDESCRIBED_USE -1
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/* Index identifying an actualargument or a formal parameter may have only this
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many bits. */
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#define IPA_PROP_ARG_INDEX_LIMIT_BITS 16
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/* ipa-prop.cc 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_LOAD_AGG is a compound pass-through jump function, in which primary
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operation on formal parameter is memory dereference that loads a value from
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a part of an aggregate, which is represented or pointed to by the formal
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parameter. Moreover, an additional unary/binary operation can be applied on
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the loaded value, and final result is passed as actual argument of callee
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(e.g. *(param_1(D) + 4) op 24 ). It is meant to describe usage of aggregate
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parameter or by-reference parameter referenced in argument passing, commonly
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found in C++ and Fortran.
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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 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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Jump functions are computed in ipa-prop.cc 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_CONST, /* represented by field costant */
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IPA_JF_PASS_THROUGH, /* represented by field pass_through */
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IPA_JF_LOAD_AGG, /* represented by field load_agg */
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IPA_JF_ANCESTOR /* represented by field ancestor */
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};
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struct ipa_cst_ref_desc;
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/* Structure holding data required to describe a constant jump function. */
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struct GTY(()) ipa_constant_data
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{
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/* The value of the constant. */
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tree value;
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/* Pointer to the structure that describes the reference. */
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struct ipa_cst_ref_desc GTY((skip)) *rdesc;
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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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Special values which have other meaning than in normal contexts:
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- NOP_EXPR means no operation, not even type conversion.
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- ASSERT_EXPR means that only the value in operand is allowed to pass
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through (without any change), for all other values the result is
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unknown.
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Otherwise operation must be a simple binary or unary arithmetic operation
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where the caller's parameter is the first operand and (for binary
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operations) the 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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unsigned agg_preserved : 1;
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/* Set when the edge has already been used to decrement an appropriate
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reference description counter and should not be decremented again. */
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unsigned refdesc_decremented : 1;
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};
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/* Structure holding data required to describe a load-value-from-aggregate
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jump function. */
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struct GTY(()) ipa_load_agg_data
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{
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/* Inherit from pass through jump function, describing unary/binary
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operation on the value loaded from aggregate that is represented or
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pointed to by the formal parameter, specified by formal_id in this
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pass_through jump function data structure. */
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struct ipa_pass_through_data pass_through;
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/* Type of the value loaded from the aggregate. */
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tree type;
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/* Offset at which the value is located within the aggregate. */
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HOST_WIDE_INT offset;
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/* True if loaded by reference (the aggregate is pointed to by the formal
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parameter) or false if loaded by value (the aggregate is represented
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by the formal parameter). */
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bool by_ref;
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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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/* 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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unsigned agg_preserved : 1;
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/* When set, the operation should not have any effect on NULL pointers. */
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unsigned keep_null : 1;
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};
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/* A jump function for an aggregate part at a given offset, which describes how
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it content value is generated. All unlisted positions are assumed to have a
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value defined in an unknown way. */
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struct GTY(()) ipa_agg_jf_item
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{
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/* The offset for the aggregate part. */
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HOST_WIDE_INT offset;
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/* Data type of the aggregate part. */
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tree type;
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/* Jump function type. */
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enum jump_func_type jftype;
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/* Represents a value of jump function. constant represents the actual constant
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in constant jump function content. pass_through is used only in simple pass
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through jump function context. load_agg is for load-value-from-aggregate
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jump function context. */
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union jump_func_agg_value
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{
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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_load_agg_data GTY ((tag ("IPA_JF_LOAD_AGG"))) load_agg;
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} GTY ((desc ("%1.jftype"))) value;
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};
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/* Jump functions describing a set of aggregate contents. */
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struct GTY(()) ipa_agg_jump_function
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{
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/* Description of the individual jump function item. */
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vec<ipa_agg_jf_item, 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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class ipcp_transformation;
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class ipa_auto_call_arg_values;
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class ipa_call_arg_values;
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/* Element of a vector describing aggregate values for a number of arguments in
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a particular context, be it a call or the aggregate constants that a node is
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specialized for. */
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struct GTY(()) ipa_argagg_value
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{
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/* The constant value. In the contexts where the list of known values is
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being pruned, NULL means a variable value. */
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tree value;
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/* Unit offset within the aggregate. */
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unsigned unit_offset;
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/* Index of the parameter, as it was in the original function (i.e. needs
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remapping after parameter modification is carried out as part of clone
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materialization). */
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unsigned index : IPA_PROP_ARG_INDEX_LIMIT_BITS;
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/* Whether the value was passed by reference. */
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unsigned by_ref : 1;
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};
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/* A view into a sorted list of aggregate values in a particular context, be it
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a call or the aggregate constants that a node is specialized for. The
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actual data is stored in the vector this has been constructed from. */
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class ipa_argagg_value_list
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{
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public:
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ipa_argagg_value_list () = delete;
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ipa_argagg_value_list (const vec<ipa_argagg_value, va_gc> *values)
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: m_elts (values)
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{}
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ipa_argagg_value_list (const vec<ipa_argagg_value> *values)
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: m_elts (*values)
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{}
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ipa_argagg_value_list (const ipa_auto_call_arg_values *aavals);
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ipa_argagg_value_list (const ipa_call_arg_values *gavals);
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ipa_argagg_value_list (const ipcp_transformation *tinfo);
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/* Return the aggregate constant stored for INDEX at UNIT_OFFSET, if it is
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passed by reference or not according to BY_REF, or NULL_TREE
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otherwise. */
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tree get_value (int index, unsigned unit_offset, bool by_ref) const;
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/* Return the aggregate constant stored for INDEX at UNIT_OFFSET, not
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performing any check of whether value is passed by reference. Return
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NULL_TREE if there is no such constant. */
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tree get_value (int index, unsigned unit_offset) const;
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/* Return the item describing a constant stored for INDEX at UNIT_OFFSET or
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NULL if there is no such constant. */
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const ipa_argagg_value *get_elt (int index, unsigned unit_offset) const;
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/* Return the first item describing a constant stored for parameter with
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INDEX, regardless of offset or reference, or NULL if there is no such
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constant. */
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const ipa_argagg_value *get_elt_for_index (int index) const;
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/* Return true if there is an aggregate constant referring to a value passed
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in or by parameter with INDEX (at any offset, whether by reference or
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not). */
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bool value_for_index_p (int index) const
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{
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return !!get_elt_for_index (index);
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}
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/* Return true if all elements present in OTHER are also present in this
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list. */
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bool superset_of_p (const ipa_argagg_value_list &other) const;
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/* Push all items in this list that describe parameter SRC_INDEX into RES as
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ones describing DST_INDEX while subtracting UNIT_DELTA from their unit
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offsets but skip those which would end up with a negative offset. */
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void push_adjusted_values (unsigned src_index, unsigned dest_index,
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unsigned unit_delta,
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vec<ipa_argagg_value> *res) const;
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/* Dump aggregate constants to FILE. */
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void dump (FILE *f);
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/* Dump aggregate constants to stderr. */
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void DEBUG_FUNCTION debug ();
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/* Array slice pointing to the actual storage. */
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array_slice<const ipa_argagg_value> m_elts;
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};
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/* Information about zero/non-zero bits. */
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class GTY(()) ipa_bits
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{
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public:
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/* The propagated value. */
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widest_int value;
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/* Mask corresponding to the value.
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Similar to ccp_lattice_t, if xth bit of mask is 0,
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implies xth bit of value is constant. */
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widest_int mask;
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};
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/* Info about value ranges. */
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class GTY(()) ipa_vr
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{
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public:
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/* The data fields below are valid only if known is true. */
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bool known;
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enum value_range_kind type;
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wide_int min;
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wide_int max;
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bool nonzero_p (tree) const;
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};
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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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struct GTY (()) ipa_jump_func
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{
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/* Aggregate jump function description. See struct ipa_agg_jump_function
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and its description. */
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struct ipa_agg_jump_function agg;
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/* Information about zero/non-zero bits. The pointed to structure is shared
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betweed different jump functions. Use ipa_set_jfunc_bits to set this
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field. */
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class ipa_bits *bits;
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/* Information about value range, containing valid data only when vr_known is
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true. The pointed to structure is shared betweed different jump
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functions. Use ipa_set_jfunc_vr to set this field. */
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value_range *m_vr;
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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_constant_data 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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};
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/* Return the constant stored in a constant jump functin JFUNC. */
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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.value;
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}
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inline struct ipa_cst_ref_desc *
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ipa_get_jf_constant_rdesc (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.rdesc;
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}
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/* Make JFUNC not participate in any further reference counting. */
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inline void
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ipa_zap_jf_refdesc (ipa_jump_func *jfunc)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_CONST);
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jfunc->value.constant.rdesc = NULL;
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}
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/* Return the operand of a pass through jmp function JFUNC. */
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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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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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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 function JFUNC. */
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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 refdesc_decremented flag of a pass through jump function
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JFUNC. */
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inline bool
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ipa_get_jf_pass_through_refdesc_decremented (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.refdesc_decremented;
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}
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/* Set the refdesc_decremented flag of a pass through jump function JFUNC to
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VALUE. */
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inline void
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ipa_set_jf_pass_through_refdesc_decremented (ipa_jump_func *jfunc, bool value)
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{
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gcc_checking_assert (jfunc->type == IPA_JF_PASS_THROUGH);
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jfunc->value.pass_through.refdesc_decremented = value;
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}
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/* Return true if pass through jump function JFUNC preserves type
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information. */
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inline bool
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ipa_get_jf_pass_through_type_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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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 number of the caller's formal parameter that an ancestor jump
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function JFUNC refers to. */
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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 function JFUNC. */
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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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/* Return true if ancestor jump function JFUNC presrves type information. */
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inline bool
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ipa_get_jf_ancestor_type_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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/* Return if jfunc represents an operation whether we first check the formal
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parameter for non-NULLness unless it does not matter because the offset is
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zero anyway. */
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inline bool
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ipa_get_jf_ancestor_keep_null (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.keep_null;
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}
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/* Class for allocating a bundle of various potentially known properties about
|
|
actual arguments of a particular call on stack for the usual case and on
|
|
heap only if there are unusually many arguments. The data is deallocated
|
|
when the instance of this class goes out of scope or is otherwise
|
|
destructed. */
|
|
|
|
class ipa_auto_call_arg_values
|
|
{
|
|
public:
|
|
/* If m_known_vals (vector of known "scalar" values) is sufficiantly long,
|
|
return its element at INDEX, otherwise return NULL. */
|
|
tree safe_sval_at (int index)
|
|
{
|
|
if ((unsigned) index < m_known_vals.length ())
|
|
return m_known_vals[index];
|
|
return NULL;
|
|
}
|
|
|
|
/* Vector describing known values of parameters. */
|
|
auto_vec<tree, 32> m_known_vals;
|
|
|
|
/* Vector describing known polymorphic call contexts. */
|
|
auto_vec<ipa_polymorphic_call_context, 32> m_known_contexts;
|
|
|
|
/* Vector describing known aggregate values. */
|
|
auto_vec<ipa_argagg_value, 32> m_known_aggs;
|
|
|
|
/* Vector describing known value ranges of arguments. */
|
|
auto_vec<value_range, 32> m_known_value_ranges;
|
|
};
|
|
|
|
inline
|
|
ipa_argagg_value_list
|
|
::ipa_argagg_value_list (const ipa_auto_call_arg_values *aavals)
|
|
: m_elts (aavals->m_known_aggs)
|
|
{}
|
|
|
|
/* Class bundling the various potentially known properties about actual
|
|
arguments of a particular call. This variant does not deallocate the
|
|
bundled data in any way as the vectors can either be pointing to vectors in
|
|
ipa_auto_call_arg_values or be allocated independently. */
|
|
|
|
class ipa_call_arg_values
|
|
{
|
|
public:
|
|
/* Default constructor, setting the vectors to empty ones. */
|
|
ipa_call_arg_values ()
|
|
{}
|
|
|
|
/* Construct this general variant of the bundle from the variant which uses
|
|
auto_vecs to hold the vectors. This means that vectors of objects
|
|
constructed with this constructor should not be changed because if they
|
|
get reallocated, the member vectors and the underlying auto_vecs would get
|
|
out of sync. */
|
|
ipa_call_arg_values (ipa_auto_call_arg_values *aavals)
|
|
: m_known_vals (aavals->m_known_vals.to_vec_legacy ()),
|
|
m_known_contexts (aavals->m_known_contexts.to_vec_legacy ()),
|
|
m_known_aggs (aavals->m_known_aggs.to_vec_legacy ()),
|
|
m_known_value_ranges (aavals->m_known_value_ranges.to_vec_legacy ())
|
|
{}
|
|
|
|
/* If m_known_vals (vector of known "scalar" values) is sufficiantly long,
|
|
return its element at INDEX, otherwise return NULL. */
|
|
tree safe_sval_at (int index)
|
|
{
|
|
if ((unsigned) index < m_known_vals.length ())
|
|
return m_known_vals[index];
|
|
return NULL;
|
|
}
|
|
|
|
/* Vector describing known values of parameters. */
|
|
vec<tree> m_known_vals = vNULL;
|
|
|
|
/* Vector describing known polymorphic call contexts. */
|
|
vec<ipa_polymorphic_call_context> m_known_contexts = vNULL;
|
|
|
|
/* Vector describing known aggregate values. */
|
|
vec<ipa_argagg_value> m_known_aggs = vNULL;
|
|
|
|
/* Vector describing known value ranges of arguments. */
|
|
vec<value_range> m_known_value_ranges = vNULL;
|
|
};
|
|
|
|
inline
|
|
ipa_argagg_value_list
|
|
::ipa_argagg_value_list (const ipa_call_arg_values *gavals)
|
|
: m_elts (gavals->m_known_aggs)
|
|
{}
|
|
|
|
/* Summary describing a single formal parameter. */
|
|
|
|
struct GTY(()) ipa_param_descriptor
|
|
{
|
|
/* In analysis and modification phase, this is the PARAM_DECL of this
|
|
parameter, in IPA LTO phase, this is the type of the described
|
|
parameter or NULL if not known. Do not read this field directly but
|
|
through ipa_get_param and ipa_get_type as appropriate. */
|
|
tree decl_or_type;
|
|
/* If all uses of the parameter are described by ipa-prop structures, this
|
|
says how many there are. If any use could not be described by means of
|
|
ipa-prop structures (which include flag dereferenced below), this is
|
|
IPA_UNDESCRIBED_USE. */
|
|
int controlled_uses;
|
|
unsigned int move_cost : 27;
|
|
/* The parameter is used. */
|
|
unsigned used : 1;
|
|
unsigned used_by_ipa_predicates : 1;
|
|
unsigned used_by_indirect_call : 1;
|
|
unsigned used_by_polymorphic_call : 1;
|
|
/* Set to true when in addition to being used in call statements, the
|
|
parameter has also been used for loads (but not for writes, does not
|
|
escape, etc.). This allows us to identify parameters p which are only
|
|
used as *p, and so when we propagate a constant to them, we can generate a
|
|
LOAD and not ADDR reference to them. */
|
|
unsigned load_dereferenced : 1;
|
|
};
|
|
|
|
/* 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). */
|
|
|
|
class GTY((for_user)) ipa_node_params
|
|
{
|
|
public:
|
|
/* Default constructor. */
|
|
ipa_node_params ();
|
|
|
|
/* Default destructor. */
|
|
~ipa_node_params ();
|
|
|
|
/* Information about individual formal parameters that are gathered when
|
|
summaries are generated. */
|
|
vec<ipa_param_descriptor, va_gc> *descriptors;
|
|
/* Pointer to an array of structures describing individual formal
|
|
parameters. */
|
|
class ipcp_param_lattices * GTY((skip)) lattices;
|
|
/* Only for versioned nodes this field would not be NULL,
|
|
it points to the node that IPA cp cloned from. */
|
|
struct cgraph_node * GTY((skip)) ipcp_orig_node;
|
|
/* If this node is an ipa-cp clone, these are the known constants that
|
|
describe what it has been specialized for. */
|
|
vec<tree> GTY((skip)) known_csts;
|
|
/* If this node is an ipa-cp clone, these are the known polymorphic contexts
|
|
that describe what it has been specialized for. */
|
|
vec<ipa_polymorphic_call_context> GTY((skip)) known_contexts;
|
|
/* Whether the param uses analysis and jump function computation has already
|
|
been performed. */
|
|
unsigned 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 do_clone_for_all_contexts : 1;
|
|
/* Set if this is an IPA-CP clone for all contexts. */
|
|
unsigned is_all_contexts_clone : 1;
|
|
/* Node has been completely replaced by clones and will be removed after
|
|
ipa-cp is finished. */
|
|
unsigned node_dead : 1;
|
|
/* Node is involved in a recursion, potentionally indirect. */
|
|
unsigned node_within_scc : 1;
|
|
/* Node contains only direct recursion. */
|
|
unsigned node_is_self_scc : 1;
|
|
/* Node is calling a private function called only once. */
|
|
unsigned node_calling_single_call : 1;
|
|
/* False when there is something makes versioning impossible. */
|
|
unsigned versionable : 1;
|
|
};
|
|
|
|
inline
|
|
ipa_node_params::ipa_node_params ()
|
|
: descriptors (NULL), lattices (NULL), ipcp_orig_node (NULL),
|
|
known_csts (vNULL), known_contexts (vNULL), analysis_done (0),
|
|
node_enqueued (0), do_clone_for_all_contexts (0), is_all_contexts_clone (0),
|
|
node_dead (0), node_within_scc (0), node_is_self_scc (0),
|
|
node_calling_single_call (0), versionable (0)
|
|
{
|
|
}
|
|
|
|
inline
|
|
ipa_node_params::~ipa_node_params ()
|
|
{
|
|
free (lattices);
|
|
vec_free (descriptors);
|
|
known_csts.release ();
|
|
known_contexts.release ();
|
|
}
|
|
|
|
/* Intermediate information that we get from alias analysis about a particular
|
|
parameter in a particular basic_block. When a parameter or the memory it
|
|
references is marked modified, we use that information in all dominated
|
|
blocks without consulting alias analysis oracle. */
|
|
|
|
struct ipa_param_aa_status
|
|
{
|
|
/* Set when this structure contains meaningful information. If not, the
|
|
structure describing a dominating BB should be used instead. */
|
|
bool valid;
|
|
|
|
/* Whether we have seen something which might have modified the data in
|
|
question. PARM is for the parameter itself, REF is for data it points to
|
|
but using the alias type of individual accesses and PT is the same thing
|
|
but for computing aggregate pass-through functions using a very inclusive
|
|
ao_ref. */
|
|
bool parm_modified, ref_modified, pt_modified;
|
|
};
|
|
|
|
/* Information related to a given BB that used only when looking at function
|
|
body. */
|
|
|
|
struct ipa_bb_info
|
|
{
|
|
/* Call graph edges going out of this BB. */
|
|
vec<cgraph_edge *> cg_edges;
|
|
/* Alias analysis statuses of each formal parameter at this bb. */
|
|
vec<ipa_param_aa_status> param_aa_statuses;
|
|
};
|
|
|
|
/* Structure with global information that is only used when looking at function
|
|
body. */
|
|
|
|
struct ipa_func_body_info
|
|
{
|
|
/* The node that is being analyzed. */
|
|
cgraph_node *node;
|
|
|
|
/* Its info. */
|
|
class ipa_node_params *info;
|
|
|
|
/* Information about individual BBs. */
|
|
vec<ipa_bb_info> bb_infos;
|
|
|
|
/* Number of parameters. */
|
|
int param_count;
|
|
|
|
/* Number of statements we are still allowed to walked by when analyzing this
|
|
function. */
|
|
unsigned int aa_walk_budget;
|
|
};
|
|
|
|
/* ipa_node_params access functions. Please use these to access fields that
|
|
are or will be shared among various passes. */
|
|
|
|
/* Return the number of formal parameters. */
|
|
|
|
inline int
|
|
ipa_get_param_count (class ipa_node_params *info)
|
|
{
|
|
return vec_safe_length (info->descriptors);
|
|
}
|
|
|
|
/* Return the parameter declaration in DESCRIPTORS at index I and assert it is
|
|
indeed a PARM_DECL. */
|
|
|
|
inline tree
|
|
ipa_get_param (const vec<ipa_param_descriptor, va_gc> &descriptors, int i)
|
|
{
|
|
tree t = descriptors[i].decl_or_type;
|
|
gcc_checking_assert (TREE_CODE (t) == PARM_DECL);
|
|
return t;
|
|
}
|
|
|
|
/* 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. This function should not be called in
|
|
WPA. */
|
|
|
|
inline tree
|
|
ipa_get_param (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
return ipa_get_param (*info->descriptors, i);
|
|
}
|
|
|
|
/* Return the type of Ith formal parameter of the function corresponding
|
|
to INFO if it is known or NULL if not. */
|
|
|
|
inline tree
|
|
ipa_get_type (class ipa_node_params *info, int i)
|
|
{
|
|
if (vec_safe_length (info->descriptors) <= (unsigned) i)
|
|
return NULL;
|
|
tree t = (*info->descriptors)[i].decl_or_type;
|
|
if (!t)
|
|
return NULL;
|
|
if (TYPE_P (t))
|
|
return t;
|
|
gcc_checking_assert (TREE_CODE (t) == PARM_DECL);
|
|
return TREE_TYPE (t);
|
|
}
|
|
|
|
/* Return the move cost of Ith formal parameter of the function corresponding
|
|
to INFO. */
|
|
|
|
inline int
|
|
ipa_get_param_move_cost (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
return (*info->descriptors)[i].move_cost;
|
|
}
|
|
|
|
/* Set the used flag corresponding to the Ith formal parameter of the function
|
|
associated with INFO to VAL. */
|
|
|
|
inline void
|
|
ipa_set_param_used (class ipa_node_params *info, int i, bool val)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
(*info->descriptors)[i].used = val;
|
|
}
|
|
|
|
/* Set the used_by_ipa_predicates flag corresponding to the Ith formal
|
|
parameter of the function associated with INFO to VAL. */
|
|
|
|
inline void
|
|
ipa_set_param_used_by_ipa_predicates (class ipa_node_params *info, int i, bool val)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
(*info->descriptors)[i].used_by_ipa_predicates = val;
|
|
}
|
|
|
|
/* Set the used_by_indirect_call flag corresponding to the Ith formal
|
|
parameter of the function associated with INFO to VAL. */
|
|
|
|
inline void
|
|
ipa_set_param_used_by_indirect_call (class ipa_node_params *info, int i, bool val)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
(*info->descriptors)[i].used_by_indirect_call = val;
|
|
}
|
|
|
|
/* Set the .used_by_polymorphic_call flag corresponding to the Ith formal
|
|
parameter of the function associated with INFO to VAL. */
|
|
|
|
inline void
|
|
ipa_set_param_used_by_polymorphic_call (class ipa_node_params *info, int i, bool val)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
(*info->descriptors)[i].used_by_polymorphic_call = val;
|
|
}
|
|
|
|
/* Return how many uses described by ipa-prop a parameter has or
|
|
IPA_UNDESCRIBED_USE if there is a use that is not described by these
|
|
structures. */
|
|
inline int
|
|
ipa_get_controlled_uses (class ipa_node_params *info, int i)
|
|
{
|
|
/* FIXME: introducing speculation causes out of bounds access here. */
|
|
if (vec_safe_length (info->descriptors) > (unsigned)i)
|
|
return (*info->descriptors)[i].controlled_uses;
|
|
return IPA_UNDESCRIBED_USE;
|
|
}
|
|
|
|
/* Set the controlled counter of a given parameter. */
|
|
|
|
inline void
|
|
ipa_set_controlled_uses (class ipa_node_params *info, int i, int val)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
(*info->descriptors)[i].controlled_uses = val;
|
|
}
|
|
|
|
/* Assuming a parameter does not have IPA_UNDESCRIBED_USE controlled uses,
|
|
return flag which indicates it has been dereferenced but only in a load. */
|
|
inline int
|
|
ipa_get_param_load_dereferenced (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_assert (ipa_get_controlled_uses (info, i) != IPA_UNDESCRIBED_USE);
|
|
return (*info->descriptors)[i].load_dereferenced;
|
|
}
|
|
|
|
/* Set the load_dereferenced flag of a given parameter. */
|
|
|
|
inline void
|
|
ipa_set_param_load_dereferenced (class ipa_node_params *info, int i, bool val)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
(*info->descriptors)[i].load_dereferenced = val;
|
|
}
|
|
|
|
/* Return the used flag corresponding to the Ith formal parameter of the
|
|
function associated with INFO. */
|
|
|
|
inline bool
|
|
ipa_is_param_used (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
return (*info->descriptors)[i].used;
|
|
}
|
|
|
|
/* Return the used_by_ipa_predicates flag corresponding to the Ith formal
|
|
parameter of the function associated with INFO. */
|
|
|
|
inline bool
|
|
ipa_is_param_used_by_ipa_predicates (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
return (*info->descriptors)[i].used_by_ipa_predicates;
|
|
}
|
|
|
|
/* Return the used_by_indirect_call flag corresponding to the Ith formal
|
|
parameter of the function associated with INFO. */
|
|
|
|
inline bool
|
|
ipa_is_param_used_by_indirect_call (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
return (*info->descriptors)[i].used_by_indirect_call;
|
|
}
|
|
|
|
/* Return the used_by_polymorphic_call flag corresponding to the Ith formal
|
|
parameter of the function associated with INFO. */
|
|
|
|
inline bool
|
|
ipa_is_param_used_by_polymorphic_call (class ipa_node_params *info, int i)
|
|
{
|
|
gcc_checking_assert (info->descriptors);
|
|
return (*info->descriptors)[i].used_by_polymorphic_call;
|
|
}
|
|
|
|
/* Structure holding information for the transformation phase of IPA-CP. */
|
|
|
|
struct GTY(()) ipcp_transformation
|
|
{
|
|
/* Known aggregate values. */
|
|
vec<ipa_argagg_value, va_gc> *m_agg_values;
|
|
/* Known bits information. */
|
|
vec<ipa_bits *, va_gc> *bits;
|
|
/* Value range information. */
|
|
vec<ipa_vr, va_gc> *m_vr;
|
|
|
|
/* Default constructor. */
|
|
ipcp_transformation ()
|
|
: m_agg_values (NULL), bits (NULL), m_vr (NULL)
|
|
{ }
|
|
|
|
/* Default destructor. */
|
|
~ipcp_transformation ()
|
|
{
|
|
vec_free (m_agg_values);
|
|
vec_free (bits);
|
|
vec_free (m_vr);
|
|
}
|
|
};
|
|
|
|
inline
|
|
ipa_argagg_value_list::ipa_argagg_value_list (const ipcp_transformation *tinfo)
|
|
: m_elts (tinfo->m_agg_values)
|
|
{}
|
|
|
|
void ipa_set_node_agg_value_chain (struct cgraph_node *node,
|
|
vec<ipa_argagg_value, va_gc> *aggs);
|
|
void ipcp_transformation_initialize (void);
|
|
void ipcp_free_transformation_sum (void);
|
|
|
|
/* ipa_edge_args stores information related to a callsite and particularly its
|
|
arguments. It can be accessed by the IPA_EDGE_REF macro. */
|
|
|
|
class GTY((for_user)) ipa_edge_args
|
|
{
|
|
public:
|
|
|
|
/* Default constructor. */
|
|
ipa_edge_args () : jump_functions (NULL), polymorphic_call_contexts (NULL)
|
|
{}
|
|
|
|
/* Destructor. */
|
|
~ipa_edge_args ()
|
|
{
|
|
unsigned int i;
|
|
ipa_jump_func *jf;
|
|
FOR_EACH_VEC_SAFE_ELT (jump_functions, i, jf)
|
|
vec_free (jf->agg.items);
|
|
vec_free (jump_functions);
|
|
vec_free (polymorphic_call_contexts);
|
|
}
|
|
|
|
/* Vectors of the callsite's jump function and polymorphic context
|
|
information of each parameter. */
|
|
vec<ipa_jump_func, va_gc> *jump_functions;
|
|
vec<ipa_polymorphic_call_context, va_gc> *polymorphic_call_contexts;
|
|
};
|
|
|
|
/* ipa_edge_args access functions. Please use these to access fields that
|
|
are or will be shared among various passes. */
|
|
|
|
/* Return the number of actual arguments. */
|
|
|
|
inline int
|
|
ipa_get_cs_argument_count (class ipa_edge_args *args)
|
|
{
|
|
return vec_safe_length (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. */
|
|
|
|
inline struct ipa_jump_func *
|
|
ipa_get_ith_jump_func (class ipa_edge_args *args, int i)
|
|
{
|
|
return &(*args->jump_functions)[i];
|
|
}
|
|
|
|
/* Returns a pointer to the polymorphic call context for the ith argument.
|
|
NULL if contexts are not computed. */
|
|
inline class ipa_polymorphic_call_context *
|
|
ipa_get_ith_polymorhic_call_context (class ipa_edge_args *args, int i)
|
|
{
|
|
if (!args->polymorphic_call_contexts)
|
|
return NULL;
|
|
return &(*args->polymorphic_call_contexts)[i];
|
|
}
|
|
|
|
/* Function summary for ipa_node_params. */
|
|
class GTY((user)) ipa_node_params_t: public function_summary <ipa_node_params *>
|
|
{
|
|
public:
|
|
ipa_node_params_t (symbol_table *table, bool ggc):
|
|
function_summary<ipa_node_params *> (table, ggc)
|
|
{
|
|
disable_insertion_hook ();
|
|
}
|
|
|
|
/* Hook that is called by summary when a node is duplicated. */
|
|
void duplicate (cgraph_node *node,
|
|
cgraph_node *node2,
|
|
ipa_node_params *data,
|
|
ipa_node_params *data2) final override;
|
|
};
|
|
|
|
/* Summary to manange ipa_edge_args structures. */
|
|
|
|
class GTY((user)) ipa_edge_args_sum_t : public call_summary <ipa_edge_args *>
|
|
{
|
|
public:
|
|
ipa_edge_args_sum_t (symbol_table *table, bool ggc)
|
|
: call_summary<ipa_edge_args *> (table, ggc) { }
|
|
|
|
void remove (cgraph_edge *edge)
|
|
{
|
|
call_summary <ipa_edge_args *>::remove (edge);
|
|
}
|
|
|
|
/* Hook that is called by summary when an edge is removed. */
|
|
void remove (cgraph_edge *cs, ipa_edge_args *args) final override;
|
|
/* Hook that is called by summary when an edge is duplicated. */
|
|
void duplicate (cgraph_edge *src,
|
|
cgraph_edge *dst,
|
|
ipa_edge_args *old_args,
|
|
ipa_edge_args *new_args) final override;
|
|
};
|
|
|
|
/* Function summary where the parameter infos are actually stored. */
|
|
extern GTY(()) ipa_node_params_t * ipa_node_params_sum;
|
|
/* Call summary to store information about edges such as jump functions. */
|
|
extern GTY(()) ipa_edge_args_sum_t *ipa_edge_args_sum;
|
|
|
|
/* Function summary for IPA-CP transformation. */
|
|
class ipcp_transformation_t
|
|
: public function_summary<ipcp_transformation *>
|
|
{
|
|
public:
|
|
ipcp_transformation_t (symbol_table *table, bool ggc):
|
|
function_summary<ipcp_transformation *> (table, ggc) {}
|
|
|
|
~ipcp_transformation_t () {}
|
|
|
|
static ipcp_transformation_t *create_ggc (symbol_table *symtab)
|
|
{
|
|
ipcp_transformation_t *summary
|
|
= new (ggc_alloc_no_dtor <ipcp_transformation_t> ())
|
|
ipcp_transformation_t (symtab, true);
|
|
return summary;
|
|
}
|
|
/* Hook that is called by summary when a node is duplicated. */
|
|
void duplicate (cgraph_node *node,
|
|
cgraph_node *node2,
|
|
ipcp_transformation *data,
|
|
ipcp_transformation *data2) final override;
|
|
};
|
|
|
|
/* Function summary where the IPA CP transformations are actually stored. */
|
|
extern GTY(()) function_summary <ipcp_transformation *> *ipcp_transformation_sum;
|
|
|
|
/* Creating and freeing ipa_node_params and ipa_edge_args. */
|
|
void ipa_create_all_node_params (void);
|
|
void ipa_create_all_edge_args (void);
|
|
void ipa_check_create_edge_args (void);
|
|
void ipa_free_all_node_params (void);
|
|
void ipa_free_all_edge_args (void);
|
|
void ipa_free_all_structures_after_ipa_cp (void);
|
|
void ipa_free_all_structures_after_iinln (void);
|
|
|
|
void ipa_register_cgraph_hooks (void);
|
|
int count_formal_params (tree fndecl);
|
|
|
|
/* This function ensures the array of node param infos is big enough to
|
|
accommodate a structure for all nodes and reallocates it if not. */
|
|
|
|
inline void
|
|
ipa_check_create_node_params (void)
|
|
{
|
|
if (!ipa_node_params_sum)
|
|
ipa_node_params_sum
|
|
= (new (ggc_alloc_no_dtor <ipa_node_params_t> ())
|
|
ipa_node_params_t (symtab, true));
|
|
}
|
|
|
|
/* Returns true if edge summary contains a record for EDGE. The main purpose
|
|
of this function is that debug dumping function can check info availability
|
|
without causing allocations. */
|
|
|
|
inline bool
|
|
ipa_edge_args_info_available_for_edge_p (struct cgraph_edge *edge)
|
|
{
|
|
return ipa_edge_args_sum->exists (edge);
|
|
}
|
|
|
|
inline ipcp_transformation *
|
|
ipcp_get_transformation_summary (cgraph_node *node)
|
|
{
|
|
if (ipcp_transformation_sum == NULL)
|
|
return NULL;
|
|
|
|
return ipcp_transformation_sum->get (node);
|
|
}
|
|
|
|
/* 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 *> *new_edges);
|
|
|
|
/* Indirect edge processing and target discovery. */
|
|
tree ipa_get_indirect_edge_target (struct cgraph_edge *ie,
|
|
ipa_call_arg_values *avals,
|
|
bool *speculative);
|
|
struct cgraph_edge *ipa_make_edge_direct_to_target (struct cgraph_edge *, tree,
|
|
bool speculative = false);
|
|
tree ipa_impossible_devirt_target (struct cgraph_edge *, tree);
|
|
ipa_bits *ipa_get_ipa_bits_for_value (const widest_int &value,
|
|
const widest_int &mask);
|
|
|
|
|
|
/* Functions related to both. */
|
|
void ipa_analyze_node (struct cgraph_node *);
|
|
|
|
/* Aggregate jump function related functions. */
|
|
tree ipa_find_agg_cst_from_init (tree scalar, HOST_WIDE_INT offset,
|
|
bool by_ref);
|
|
bool ipa_load_from_parm_agg (struct ipa_func_body_info *fbi,
|
|
vec<ipa_param_descriptor, va_gc> *descriptors,
|
|
gimple *stmt, tree op, int *index_p,
|
|
HOST_WIDE_INT *offset_p, poly_int64 *size_p,
|
|
bool *by_ref, bool *guaranteed_unmodified = NULL);
|
|
|
|
/* 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);
|
|
|
|
template <typename value>
|
|
class ipcp_value;
|
|
|
|
extern object_allocator<ipcp_value<tree> > ipcp_cst_values_pool;
|
|
extern object_allocator<ipcp_value<ipa_polymorphic_call_context> >
|
|
ipcp_poly_ctx_values_pool;
|
|
|
|
template <typename valtype>
|
|
struct ipcp_value_source;
|
|
|
|
extern object_allocator<ipcp_value_source<tree> > ipcp_sources_pool;
|
|
|
|
struct ipcp_agg_lattice;
|
|
|
|
extern object_allocator<ipcp_agg_lattice> ipcp_agg_lattice_pool;
|
|
|
|
void ipa_prop_write_jump_functions (void);
|
|
void ipa_prop_read_jump_functions (void);
|
|
void ipcp_write_transformation_summaries (void);
|
|
void ipcp_read_transformation_summaries (void);
|
|
int ipa_get_param_decl_index (class ipa_node_params *, tree);
|
|
tree ipa_value_from_jfunc (class ipa_node_params *info,
|
|
struct ipa_jump_func *jfunc, tree type);
|
|
tree ipa_agg_value_from_jfunc (ipa_node_params *info, cgraph_node *node,
|
|
const ipa_agg_jf_item *item);
|
|
unsigned int ipcp_transform_function (struct cgraph_node *node);
|
|
ipa_polymorphic_call_context ipa_context_from_jfunc (ipa_node_params *,
|
|
cgraph_edge *,
|
|
int,
|
|
ipa_jump_func *);
|
|
value_range ipa_value_range_from_jfunc (ipa_node_params *, cgraph_edge *,
|
|
ipa_jump_func *, tree);
|
|
void ipa_push_agg_values_from_jfunc (ipa_node_params *info, cgraph_node *node,
|
|
ipa_agg_jump_function *agg_jfunc,
|
|
unsigned dst_index,
|
|
vec<ipa_argagg_value> *res);
|
|
void ipa_dump_param (FILE *, class ipa_node_params *info, int i);
|
|
void ipa_release_body_info (struct ipa_func_body_info *);
|
|
tree ipa_get_callee_param_type (struct cgraph_edge *e, int i);
|
|
bool ipcp_get_parm_bits (tree, tree *, widest_int *);
|
|
bool unadjusted_ptr_and_unit_offset (tree op, tree *ret,
|
|
poly_int64 *offset_ret);
|
|
|
|
/* From tree-sra.cc: */
|
|
tree build_ref_for_offset (location_t, tree, poly_int64, bool, tree,
|
|
gimple_stmt_iterator *, bool);
|
|
|
|
/* In ipa-cp.cc */
|
|
void ipa_cp_cc_finalize (void);
|
|
|
|
#endif /* IPA_PROP_H */
|