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/* Convert language-specific tree expression to rtl instructions,
for GNU compiler.
Copyright (C) 1988-2017 Free Software Foundation, Inc.
This file is part of GCC.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "cp-tree.h"
/* Expand C++-specific constants. Currently, this means PTRMEM_CST. */
tree
cplus_expand_constant (tree cst)
{
switch (TREE_CODE (cst))
{
case PTRMEM_CST:
{
tree type = TREE_TYPE (cst);
tree member;
/* Find the member. */
member = PTRMEM_CST_MEMBER (cst);
/* We can't lower this until the class is complete. */
if (!COMPLETE_TYPE_P (DECL_CONTEXT (member)))
return cst;
if (TREE_CODE (member) == FIELD_DECL)
{
/* Find the offset for the field. */
cst = byte_position (member);
while (!same_type_p (DECL_CONTEXT (member),
TYPE_PTRMEM_CLASS_TYPE (type)))
{
/* The MEMBER must have been nestled within an
anonymous aggregate contained in TYPE. Find the
anonymous aggregate. */
member = lookup_anon_field (TYPE_PTRMEM_CLASS_TYPE (type),
DECL_CONTEXT (member));
cst = size_binop (PLUS_EXPR, cst, byte_position (member));
}
cst = fold (build_nop (type, cst));
}
else
{
tree delta;
tree pfn;
expand_ptrmemfunc_cst (cst, &delta, &pfn);
cst = build_ptrmemfunc1 (type, delta, pfn);
}
}
break;
case CONSTRUCTOR:
{
constructor_elt *elt;
unsigned HOST_WIDE_INT idx;
FOR_EACH_VEC_SAFE_ELT (CONSTRUCTOR_ELTS (cst), idx, elt)
elt->value = cplus_expand_constant (elt->value);
}
default:
/* There's nothing to do. */
break;
}
return cst;
}
/* Called whenever the expression EXPR is used in an rvalue context.
When REJECT_BUILTIN is true the expression is checked to make sure
it doesn't make it possible to obtain the address of a GCC built-in
function with no library fallback (or any of its bits, such as in
a conversion to bool). */
tree
mark_rvalue_use (tree expr,
location_t loc /* = UNKNOWN_LOCATION */,
bool reject_builtin /* = true */)
{
if (reject_builtin && reject_gcc_builtin (expr, loc))
return error_mark_node;
mark_exp_read (expr);
return expr;
}
/* Called whenever an expression is used in an lvalue context. */
tree
mark_lvalue_use (tree expr)
{
mark_exp_read (expr);
return expr;
}
/* Called whenever an expression is used in a type use context. */
tree
mark_type_use (tree expr)
{
mark_exp_read (expr);
return expr;
}
/* Mark EXP as read, not just set, for set but not used -Wunused
warning purposes. */
void
mark_exp_read (tree exp)
{
if (exp == NULL)
return;
switch (TREE_CODE (exp))
{
case VAR_DECL:
if (DECL_DECOMPOSITION_P (exp))
mark_exp_read (DECL_DECOMP_BASE (exp));
gcc_fallthrough ();
case PARM_DECL:
DECL_READ_P (exp) = 1;
break;
case ARRAY_REF:
case COMPONENT_REF:
case MODIFY_EXPR:
case REALPART_EXPR:
case IMAGPART_EXPR:
CASE_CONVERT:
case ADDR_EXPR:
case INDIRECT_REF:
case FLOAT_EXPR:
case NON_DEPENDENT_EXPR:
case VIEW_CONVERT_EXPR:
mark_exp_read (TREE_OPERAND (exp, 0));
break;
case COMPOUND_EXPR:
mark_exp_read (TREE_OPERAND (exp, 1));
break;
case COND_EXPR:
if (TREE_OPERAND (exp, 1))
mark_exp_read (TREE_OPERAND (exp, 1));
if (TREE_OPERAND (exp, 2))
mark_exp_read (TREE_OPERAND (exp, 2));
break;
default:
break;
}
}
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