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decl.c (gnat_to_gnu_param): Add comment about double reference and DECL_POINTS_TO_READONLY_P. 

* gcc-interface/decl.c (gnat_to_gnu_param): Add comment about double
	reference and DECL_POINTS_TO_READONLY_P.
	* gcc-interface/trans.c (Identifier_to_gnu) <by_ref>: Always set the
	TREE_READONLY flag on the first dereference of a double dereference.

From-SVN: r182460
This commit is contained in:
Eric Botcazou 2011-12-18 14:41:00 +00:00 committed by Eric Botcazou
parent 7cb62ef1ba
commit 2ad8d9105d
3 changed files with 14 additions and 2 deletions
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7
gcc/ada/ChangeLog
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@ -1,3 +1,10 @@
2011-12-18 Eric Botcazou <ebotcazou@adacore.com>
* gcc-interface/decl.c (gnat_to_gnu_param): Add comment about double
reference and DECL_POINTS_TO_READONLY_P.
* gcc-interface/trans.c (Identifier_to_gnu) <by_ref>: Always set the
TREE_READONLY flag on the first dereference of a double dereference.
2011-12-15 Arnaud Charlet <charlet@adacore.com>
* a-numaux-vms.ads, s-asthan-vms-ia64.adb, s-auxdec-vms-ia64.adb,

4
gcc/ada/gcc-interface/decl.c
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@ -5587,6 +5587,10 @@ gnat_to_gnu_param (Entity_Id gnat_param, Mechanism_Type mech,
DECL_BY_COMPONENT_PTR_P (gnu_param) = by_component_ptr;
DECL_BY_DESCRIPTOR_P (gnu_param) = (mech == By_Descriptor ||
mech == By_Short_Descriptor);
/* Note that, in case of a parameter passed by double reference, the
DECL_POINTS_TO_READONLY_P flag is meant for the second reference.
The first reference always points to read-only, as it points to
the second reference, i.e. the reference to the actual parameter. */
DECL_POINTS_TO_READONLY_P (gnu_param)
= (ro_param && (by_ref || by_component_ptr));
DECL_CAN_NEVER_BE_NULL_P (gnu_param) = Can_Never_Be_Null (gnat_param);

5
gcc/ada/gcc-interface/trans.c
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@ -1038,8 +1038,9 @@ Identifier_to_gnu (Node_Id gnat_node, tree *gnu_result_type_p)
if (TREE_CODE (gnu_result) == INDIRECT_REF)
TREE_THIS_NOTRAP (gnu_result) = 1;
if (read_only)
TREE_READONLY (gnu_result) = 1;
/* The first reference, in case of a double reference, always points
to read-only, see gnat_to_gnu_param for the rationale. */
TREE_READONLY (gnu_result) = 1;
}
/* If it's a PARM_DECL to foreign convention subprogram, convert it. */