gimple-array-bounds.cc File Reference

#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "backend.h"
#include "tree.h"
#include "gimple.h"
#include "ssa.h"
#include "pointer-query.h"
#include "gimple-array-bounds.h"
#include "gimple-iterator.h"
#include "gimple-walk.h"
#include "tree-dfa.h"
#include "fold-const.h"
#include "diagnostic-core.h"
#include "intl.h"
#include "tree-vrp.h"
#include "alloc-pool.h"
#include "vr-values.h"
#include "domwalk.h"
#include "tree-cfg.h"
#include "attribs.h"

Include dependency graph for gimple-array-bounds.cc:

Data Structures
class	check_array_bounds_dom_walker

Functions
static tree	get_base_decl (tree ref)
static tree	get_ref_size (tree arg, tree *pref)
static bool	trailing_array (tree arg, tree *pref)
static void	get_up_bounds_for_array_ref (tree ref, tree *decl, tree *up_bound, tree *up_bound_p1)
static bool	check_out_of_bounds_and_warn (location_t location, tree ref, tree low_sub_org, tree low_sub, tree up_sub, tree up_bound, tree up_bound_p1, const value_range *vr, bool ignore_off_by_one, bool for_array_bound, bool *out_of_bound)
static bool	inbounds_memaccess_p (tree t, gimple *stmt)

Function Documentation

check_out_of_bounds_and_warn()

static bool check_out_of_bounds_and_warn ( location_t location, tree ref, tree low_sub_org, tree low_sub, tree up_sub, tree up_bound, tree up_bound_p1, const value_range * vr, bool ignore_off_by_one, bool for_array_bound, bool * out_of_bound )

static

Given the LOW_SUB_ORG, LOW_SUB and UP_SUB, and the computed UP_BOUND
and UP_BOUND_P1, check whether the array reference REF is out of bound.
When out of bounds, set OUT_OF_BOUND to true.
Issue warnings if FOR_ARRAY_BOUND is true.
return TRUE if warnings are issued.   

References array_ref_low_bound(), get_legacy_range(), ggc_alloc(), TREE_CODE, tree_int_cst_equal(), tree_int_cst_le(), tree_int_cst_lt(), TREE_OPERAND, TREE_TYPE, VR_ANTI_RANGE, and warning_at().

Referenced by array_bounds_checker::check_array_ref().

get_base_decl()

static tree get_base_decl ( tree ref )

static

Try to determine the DECL that REF refers to.  Return the DECL or
the expression closest to it.  Used in informational notes pointing
to referenced objects or function parameters.   

References DECL_P, get_base_address(), ggc_alloc(), gimple_assign_rhs1(), gimple_assign_single_p(), gimple_nop_p(), SSA_NAME_DEF_STMT, SSA_NAME_VAR, TREE_CODE, and TREE_OPERAND.

Referenced by get_ref_size(), and trailing_array().

get_ref_size()

static tree get_ref_size ( tree arg, tree * pref )

static

Return the constant byte size of the object or type referenced by
the MEM_REF ARG.  On success, set *PREF to the DECL or expression
ARG refers to.  Otherwise return null.   

References get_base_decl(), ggc_alloc(), NULL_TREE, POINTER_TYPE_P, pref, TREE_CODE, TREE_OPERAND, TREE_TYPE, and TYPE_SIZE_UNIT.

Referenced by get_up_bounds_for_array_ref().

get_up_bounds_for_array_ref()

static void get_up_bounds_for_array_ref ( tree ref, tree * decl, tree * up_bound, tree * up_bound_p1 )

static

Acquire the upper bound and upper bound plus one for the array
reference REF and record them into UP_BOUND and UP_BOUND_P1.
Set *DECL to the decl or expresssion REF refers to.   

References array_ref_element_size(), build_int_cst(), component_ref_size(), DECL_P, DECL_SIZE_UNIT, fold_convert, get_addr_base_and_unit_offset(), get_ref_size(), ggc_alloc(), int_const_binop(), integer_zerop(), known_gt, NULL_TREE, ptrdiff_type_node, sizetype, wi::sub(), wi::to_wide(), trailing_array(), TREE_CODE, TREE_OPERAND, TREE_TYPE, TYPE_MAX_VALUE, and wide_int_to_tree().

Referenced by array_bounds_checker::check_array_ref().

inbounds_memaccess_p()

static bool inbounds_memaccess_p ( tree t, gimple * stmt )

static

Return true if T is a reference to a member of a base class that's within
the bounds of the enclosing complete object.  The function "hacks" around
problems discussed in pr98266 and pr97595.   

References byte_position(), compute_objsize(), DECL_SIZE_UNIT, ggc_alloc(), int_const_binop(), RECORD_OR_UNION_TYPE_P, TREE_CODE, tree_int_cst_le(), tree_int_cst_lt(), TREE_OPERAND, TREE_TYPE, and TYPE_BINFO.

Referenced by array_bounds_checker::check_array_bounds().

trailing_array()

static bool trailing_array ( tree arg, tree * pref )

static

Return true if REF is (likely) an ARRAY_REF to a trailing array member
of a struct.  It refines array_ref_flexible_size_p by detecting a pointer
to an array and an array parameter declared using the [N] syntax (as
opposed to a pointer) and returning false.  Set *PREF to the decl or
expression REF refers to.   

References array_ref_flexible_size_p(), get_base_decl(), ggc_alloc(), POINTER_TYPE_P, pref, TREE_CODE, TREE_OPERAND, and TREE_TYPE.

Referenced by get_up_bounds_for_array_ref().