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tree.h (CONSTRUCTOR_NO_CLEARING): Define.
* tree.h (CONSTRUCTOR_NO_CLEARING): Define. * tree-core.h (CONSTRUCTOR_NO_CLEARING): Document it. * tree.def (CONSTRUCTOR): Likewise. * doc/generic.texi (CONSTRUCTOR): Likewise. Update description. * gimplify.c (gimplify_init_constructor): Do not clear the object when the constructor is incomplete and CONSTRUCTOR_NO_CLEARING is set. ada/ * gcc-interface/utils2.c (gnat_build_constructor): Also set the flag CONSTRUCTOR_NO_CLEARING on the constructor. From-SVN: r204677
This commit is contained in:
Tristan Gingold
Eric Botcazou
parent
7008512d47
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1448093c32
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@ -1,3 +1,12 @@
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2013-11-11 Tristan Gingold <gingold@adacore.com>
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Eric Botcazou <ebotcazou@adacore.com>
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* tree.h (CONSTRUCTOR_NO_CLEARING): Define.
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* tree-core.h (CONSTRUCTOR_NO_CLEARING): Document it.
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* tree.def (CONSTRUCTOR): Likewise.
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* doc/generic.texi (CONSTRUCTOR): Likewise. Update description.
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* gimplify.c (gimplify_init_constructor): Do not clear the object when
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the constructor is incomplete and CONSTRUCTOR_NO_CLEARING is set.
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2013-11-11 Basile Starynkevitch <basile@starynkevitch.net>
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@ -1,3 +1,9 @@
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2013-11-11 Tristan Gingold <gingold@adacore.com>
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Eric Botcazou <ebotcazou@adacore.com>
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* gcc-interface/utils2.c (gnat_build_constructor): Also set the flag
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CONSTRUCTOR_NO_CLEARING on the constructor.
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2013-10-30 Sharad Singhai <singhai@google.com>
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* gnat_ugn.texi: Remove option description for PR middle-end/58134.
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@ -1874,6 +1874,7 @@ gnat_build_constructor (tree type, vec<constructor_elt, va_gc> *v)
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v->qsort (compare_elmt_bitpos);
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result = build_constructor (type, v);
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CONSTRUCTOR_NO_CLEARING (result) = 1;
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TREE_CONSTANT (result) = TREE_STATIC (result) = allconstant;
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TREE_SIDE_EFFECTS (result) = side_effects;
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TREE_READONLY (result) = TYPE_READONLY (type) || allconstant;
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@ -1616,29 +1616,31 @@ of temporaries during the evaluation of that expression should be
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performed immediately after the expression is evaluated.
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@item CONSTRUCTOR
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These nodes represent the brace-enclosed initializers for a structure or
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array. The first operand is reserved for use by the back end. The
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second operand is a @code{TREE_LIST}. If the @code{TREE_TYPE} of the
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@code{CONSTRUCTOR} is a @code{RECORD_TYPE} or @code{UNION_TYPE}, then
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the @code{TREE_PURPOSE} of each node in the @code{TREE_LIST} will be a
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@code{FIELD_DECL} and the @code{TREE_VALUE} of each node will be the
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expression used to initialize that field.
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These nodes represent the brace-enclosed initializers for a structure or an
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array. They contain a sequence of component values made out of a vector of
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constructor_elt, which is a (@code{INDEX}, @code{VALUE}) pair.
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If the @code{TREE_TYPE} of the @code{CONSTRUCTOR} is an
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@code{ARRAY_TYPE}, then the @code{TREE_PURPOSE} of each element in the
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@code{TREE_LIST} will be an @code{INTEGER_CST} or a @code{RANGE_EXPR} of
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two @code{INTEGER_CST}s. A single @code{INTEGER_CST} indicates which
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element of the array (indexed from zero) is being assigned to. A
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@code{RANGE_EXPR} indicates an inclusive range of elements to
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initialize. In both cases the @code{TREE_VALUE} is the corresponding
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If the @code{TREE_TYPE} of the @code{CONSTRUCTOR} is a @code{RECORD_TYPE},
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@code{UNION_TYPE} or @code{QUAL_UNION_TYPE} then the @code{INDEX} of each
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node in the sequence will be a @code{FIELD_DECL} and the @code{VALUE} will
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be the expression used to initialize that field.
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If the @code{TREE_TYPE} of the @code{CONSTRUCTOR} is an @code{ARRAY_TYPE},
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then the @code{INDEX} of each node in the sequence will be an
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@code{INTEGER_CST} or a @code{RANGE_EXPR} of two @code{INTEGER_CST}s.
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A single @code{INTEGER_CST} indicates which element of the array is being
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assigned to. A @code{RANGE_EXPR} indicates an inclusive range of elements
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to initialize. In both cases the @code{VALUE} is the corresponding
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initializer. It is re-evaluated for each element of a
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@code{RANGE_EXPR}. If the @code{TREE_PURPOSE} is @code{NULL_TREE}, then
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@code{RANGE_EXPR}. If the @code{INDEX} is @code{NULL_TREE}, then
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the initializer is for the next available array element.
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In the front end, you should not depend on the fields appearing in any
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particular order. However, in the middle end, fields must appear in
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declaration order. You should not assume that all fields will be
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represented. Unrepresented fields will be set to zero.
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represented. Unrepresented fields will be cleared (zeroed), unless the
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CONSTRUCTOR_NO_CLEARING flag is set, in which case their value becomes
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undefined.
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@item COMPOUND_LITERAL_EXPR
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@findex COMPOUND_LITERAL_EXPR_DECL_EXPR
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@ -831,6 +831,9 @@ struct GTY(()) tree_base {
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VAR_DECL, FUNCTION_DECL
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IDENTIFIER_NODE
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CONSTRUCTOR_NO_CLEARING in
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CONSTRUCTOR
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ASM_VOLATILE_P in
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ASM_EXPR
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15
gcc/tree.def
15
gcc/tree.def
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@ -445,10 +445,12 @@ DEFTREECODE (INDIRECT_REF, "indirect_ref", tcc_reference, 1)
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OBJ_TYPE_REF_TOKEN: An integer index to the virtual method table. */
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DEFTREECODE (OBJ_TYPE_REF, "obj_type_ref", tcc_expression, 3)
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/* Constructor: return an aggregate value made from specified components.
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In C, this is used only for structure and array initializers.
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The operand is a sequence of component values made out of a VEC of
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struct constructor_elt.
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/* Used to represent the brace-enclosed initializers for a structure or an
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array. It contains a sequence of component values made out of a VEC of
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constructor_elt.
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For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE:
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The field INDEX of each constructor_elt is a FIELD_DECL.
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For ARRAY_TYPE:
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The field INDEX of each constructor_elt is the corresponding index.
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@ -457,8 +459,9 @@ DEFTREECODE (OBJ_TYPE_REF, "obj_type_ref", tcc_expression, 3)
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has side-effects, they are evaluated once for each element. Wrap the
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value in a SAVE_EXPR if you want to evaluate side effects only once.)
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For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE:
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The field INDEX of each node is a FIELD_DECL. */
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Components that aren't present are cleared as per the C semantics,
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unless the CONSTRUCTOR_NO_CLEARING flag is set, in which case their
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value becomes undefined. */
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DEFTREECODE (CONSTRUCTOR, "constructor", tcc_exceptional, 0)
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/* The expression types are mostly straightforward, with the fourth argument
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@ -957,6 +957,8 @@ extern void omp_clause_range_check_failed (const_tree, const char *, int,
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(&(*CONSTRUCTOR_ELTS (NODE))[IDX])
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#define CONSTRUCTOR_NELTS(NODE) \
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(vec_safe_length (CONSTRUCTOR_ELTS (NODE)))
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#define CONSTRUCTOR_NO_CLEARING(NODE) \
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(CONSTRUCTOR_CHECK (NODE)->base.public_flag)
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/* Iterate through the vector V of CONSTRUCTOR_ELT elements, yielding the
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value of each element (stored within VAL). IX must be a scratch variable
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