/* Perform the semantic phase of parsing, i.e., the process of
building tree structure, checking semantic consistency, and
building RTL. These routines are used both during actual parsing
and during the instantiation of template functions.
Copyright (C) 1998-2015 Free Software Foundation, Inc.
Written by Mark Mitchell (mmitchell@usa.net) based on code found
formerly in parse.y and pt.c.
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
. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "tm.h"
#include "alias.h"
#include "tree.h"
#include "stmt.h"
#include "varasm.h"
#include "stor-layout.h"
#include "stringpool.h"
#include "cp-tree.h"
#include "c-family/c-common.h"
#include "c-family/c-objc.h"
#include "tree-inline.h"
#include "intl.h"
#include "toplev.h"
#include "flags.h"
#include "timevar.h"
#include "diagnostic.h"
#include "hard-reg-set.h"
#include "function.h"
#include "cgraph.h"
#include "tree-iterator.h"
#include "target.h"
#include "gimplify.h"
#include "bitmap.h"
#include "omp-low.h"
#include "builtins.h"
#include "convert.h"
#include "gomp-constants.h"
/* There routines provide a modular interface to perform many parsing
operations. They may therefore be used during actual parsing, or
during template instantiation, which may be regarded as a
degenerate form of parsing. */
static tree maybe_convert_cond (tree);
static tree finalize_nrv_r (tree *, int *, void *);
static tree capture_decltype (tree);
/* Deferred Access Checking Overview
---------------------------------
Most C++ expressions and declarations require access checking
to be performed during parsing. However, in several cases,
this has to be treated differently.
For member declarations, access checking has to be deferred
until more information about the declaration is known. For
example:
class A {
typedef int X;
public:
X f();
};
A::X A::f();
A::X g();
When we are parsing the function return type `A::X', we don't
really know if this is allowed until we parse the function name.
Furthermore, some contexts require that access checking is
never performed at all. These include class heads, and template
instantiations.
Typical use of access checking functions is described here:
1. When we enter a context that requires certain access checking
mode, the function `push_deferring_access_checks' is called with
DEFERRING argument specifying the desired mode. Access checking
may be performed immediately (dk_no_deferred), deferred
(dk_deferred), or not performed (dk_no_check).
2. When a declaration such as a type, or a variable, is encountered,
the function `perform_or_defer_access_check' is called. It
maintains a vector of all deferred checks.
3. The global `current_class_type' or `current_function_decl' is then
setup by the parser. `enforce_access' relies on these information
to check access.
4. Upon exiting the context mentioned in step 1,
`perform_deferred_access_checks' is called to check all declaration
stored in the vector. `pop_deferring_access_checks' is then
called to restore the previous access checking mode.
In case of parsing error, we simply call `pop_deferring_access_checks'
without `perform_deferred_access_checks'. */
struct GTY(()) deferred_access {
/* A vector representing name-lookups for which we have deferred
checking access controls. We cannot check the accessibility of
names used in a decl-specifier-seq until we know what is being
declared because code like:
class A {
class B {};
B* f();
}
A::B* A::f() { return 0; }
is valid, even though `A::B' is not generally accessible. */
vec * GTY(()) deferred_access_checks;
/* The current mode of access checks. */
enum deferring_kind deferring_access_checks_kind;
};
/* Data for deferred access checking. */
static GTY(()) vec *deferred_access_stack;
static GTY(()) unsigned deferred_access_no_check;
/* Save the current deferred access states and start deferred
access checking iff DEFER_P is true. */
void
push_deferring_access_checks (deferring_kind deferring)
{
/* For context like template instantiation, access checking
disabling applies to all nested context. */
if (deferred_access_no_check || deferring == dk_no_check)
deferred_access_no_check++;
else
{
deferred_access e = {NULL, deferring};
vec_safe_push (deferred_access_stack, e);
}
}
/* Save the current deferred access states and start deferred access
checking, continuing the set of deferred checks in CHECKS. */
void
reopen_deferring_access_checks (vec * checks)
{
push_deferring_access_checks (dk_deferred);
if (!deferred_access_no_check)
deferred_access_stack->last().deferred_access_checks = checks;
}
/* Resume deferring access checks again after we stopped doing
this previously. */
void
resume_deferring_access_checks (void)
{
if (!deferred_access_no_check)
deferred_access_stack->last().deferring_access_checks_kind = dk_deferred;
}
/* Stop deferring access checks. */
void
stop_deferring_access_checks (void)
{
if (!deferred_access_no_check)
deferred_access_stack->last().deferring_access_checks_kind = dk_no_deferred;
}
/* Discard the current deferred access checks and restore the
previous states. */
void
pop_deferring_access_checks (void)
{
if (deferred_access_no_check)
deferred_access_no_check--;
else
deferred_access_stack->pop ();
}
/* Returns a TREE_LIST representing the deferred checks.
The TREE_PURPOSE of each node is the type through which the
access occurred; the TREE_VALUE is the declaration named.
*/
vec *
get_deferred_access_checks (void)
{
if (deferred_access_no_check)
return NULL;
else
return (deferred_access_stack->last().deferred_access_checks);
}
/* Take current deferred checks and combine with the
previous states if we also defer checks previously.
Otherwise perform checks now. */
void
pop_to_parent_deferring_access_checks (void)
{
if (deferred_access_no_check)
deferred_access_no_check--;
else
{
vec *checks;
deferred_access *ptr;
checks = (deferred_access_stack->last ().deferred_access_checks);
deferred_access_stack->pop ();
ptr = &deferred_access_stack->last ();
if (ptr->deferring_access_checks_kind == dk_no_deferred)
{
/* Check access. */
perform_access_checks (checks, tf_warning_or_error);
}
else
{
/* Merge with parent. */
int i, j;
deferred_access_check *chk, *probe;
FOR_EACH_VEC_SAFE_ELT (checks, i, chk)
{
FOR_EACH_VEC_SAFE_ELT (ptr->deferred_access_checks, j, probe)
{
if (probe->binfo == chk->binfo &&
probe->decl == chk->decl &&
probe->diag_decl == chk->diag_decl)
goto found;
}
/* Insert into parent's checks. */
vec_safe_push (ptr->deferred_access_checks, *chk);
found:;
}
}
}
}
/* Perform the access checks in CHECKS. The TREE_PURPOSE of each node
is the BINFO indicating the qualifying scope used to access the
DECL node stored in the TREE_VALUE of the node. If CHECKS is empty
or we aren't in SFINAE context or all the checks succeed return TRUE,
otherwise FALSE. */
bool
perform_access_checks (vec *checks,
tsubst_flags_t complain)
{
int i;
deferred_access_check *chk;
location_t loc = input_location;
bool ok = true;
if (!checks)
return true;
FOR_EACH_VEC_SAFE_ELT (checks, i, chk)
{
input_location = chk->loc;
ok &= enforce_access (chk->binfo, chk->decl, chk->diag_decl, complain);
}
input_location = loc;
return (complain & tf_error) ? true : ok;
}
/* Perform the deferred access checks.
After performing the checks, we still have to keep the list
`deferred_access_stack->deferred_access_checks' since we may want
to check access for them again later in a different context.
For example:
class A {
typedef int X;
static X a;
};
A::X A::a, x; // No error for `A::a', error for `x'
We have to perform deferred access of `A::X', first with `A::a',
next with `x'. Return value like perform_access_checks above. */
bool
perform_deferred_access_checks (tsubst_flags_t complain)
{
return perform_access_checks (get_deferred_access_checks (), complain);
}
/* Defer checking the accessibility of DECL, when looked up in
BINFO. DIAG_DECL is the declaration to use to print diagnostics.
Return value like perform_access_checks above. */
bool
perform_or_defer_access_check (tree binfo, tree decl, tree diag_decl,
tsubst_flags_t complain)
{
int i;
deferred_access *ptr;
deferred_access_check *chk;
/* Exit if we are in a context that no access checking is performed.
*/
if (deferred_access_no_check)
return true;
gcc_assert (TREE_CODE (binfo) == TREE_BINFO);
ptr = &deferred_access_stack->last ();
/* If we are not supposed to defer access checks, just check now. */
if (ptr->deferring_access_checks_kind == dk_no_deferred)
{
bool ok = enforce_access (binfo, decl, diag_decl, complain);
return (complain & tf_error) ? true : ok;
}
/* See if we are already going to perform this check. */
FOR_EACH_VEC_SAFE_ELT (ptr->deferred_access_checks, i, chk)
{
if (chk->decl == decl && chk->binfo == binfo &&
chk->diag_decl == diag_decl)
{
return true;
}
}
/* If not, record the check. */
deferred_access_check new_access = {binfo, decl, diag_decl, input_location};
vec_safe_push (ptr->deferred_access_checks, new_access);
return true;
}
/* Returns nonzero if the current statement is a full expression,
i.e. temporaries created during that statement should be destroyed
at the end of the statement. */
int
stmts_are_full_exprs_p (void)
{
return current_stmt_tree ()->stmts_are_full_exprs_p;
}
/* T is a statement. Add it to the statement-tree. This is the C++
version. The C/ObjC frontends have a slightly different version of
this function. */
tree
add_stmt (tree t)
{
enum tree_code code = TREE_CODE (t);
if (EXPR_P (t) && code != LABEL_EXPR)
{
if (!EXPR_HAS_LOCATION (t))
SET_EXPR_LOCATION (t, input_location);
/* When we expand a statement-tree, we must know whether or not the
statements are full-expressions. We record that fact here. */
STMT_IS_FULL_EXPR_P (t) = stmts_are_full_exprs_p ();
}
if (code == LABEL_EXPR || code == CASE_LABEL_EXPR)
STATEMENT_LIST_HAS_LABEL (cur_stmt_list) = 1;
/* Add T to the statement-tree. Non-side-effect statements need to be
recorded during statement expressions. */
gcc_checking_assert (!stmt_list_stack->is_empty ());
append_to_statement_list_force (t, &cur_stmt_list);
return t;
}
/* Returns the stmt_tree to which statements are currently being added. */
stmt_tree
current_stmt_tree (void)
{
return (cfun
? &cfun->language->base.x_stmt_tree
: &scope_chain->x_stmt_tree);
}
/* If statements are full expressions, wrap STMT in a CLEANUP_POINT_EXPR. */
static tree
maybe_cleanup_point_expr (tree expr)
{
if (!processing_template_decl && stmts_are_full_exprs_p ())
expr = fold_build_cleanup_point_expr (TREE_TYPE (expr), expr);
return expr;
}
/* Like maybe_cleanup_point_expr except have the type of the new expression be
void so we don't need to create a temporary variable to hold the inner
expression. The reason why we do this is because the original type might be
an aggregate and we cannot create a temporary variable for that type. */
tree
maybe_cleanup_point_expr_void (tree expr)
{
if (!processing_template_decl && stmts_are_full_exprs_p ())
expr = fold_build_cleanup_point_expr (void_type_node, expr);
return expr;
}
/* Create a declaration statement for the declaration given by the DECL. */
void
add_decl_expr (tree decl)
{
tree r = build_stmt (input_location, DECL_EXPR, decl);
if (DECL_INITIAL (decl)
|| (DECL_SIZE (decl) && TREE_SIDE_EFFECTS (DECL_SIZE (decl))))
r = maybe_cleanup_point_expr_void (r);
add_stmt (r);
}
/* Finish a scope. */
tree
do_poplevel (tree stmt_list)
{
tree block = NULL;
if (stmts_are_full_exprs_p ())
block = poplevel (kept_level_p (), 1, 0);
stmt_list = pop_stmt_list (stmt_list);
if (!processing_template_decl)
{
stmt_list = c_build_bind_expr (input_location, block, stmt_list);
/* ??? See c_end_compound_stmt re statement expressions. */
}
return stmt_list;
}
/* Begin a new scope. */
static tree
do_pushlevel (scope_kind sk)
{
tree ret = push_stmt_list ();
if (stmts_are_full_exprs_p ())
begin_scope (sk, NULL);
return ret;
}
/* Queue a cleanup. CLEANUP is an expression/statement to be executed
when the current scope is exited. EH_ONLY is true when this is not
meant to apply to normal control flow transfer. */
void
push_cleanup (tree decl, tree cleanup, bool eh_only)
{
tree stmt = build_stmt (input_location, CLEANUP_STMT, NULL, cleanup, decl);
CLEANUP_EH_ONLY (stmt) = eh_only;
add_stmt (stmt);
CLEANUP_BODY (stmt) = push_stmt_list ();
}
/* Simple infinite loop tracking for -Wreturn-type. We keep a stack of all
the current loops, represented by 'NULL_TREE' if we've seen a possible
exit, and 'error_mark_node' if not. This is currently used only to
suppress the warning about a function with no return statements, and
therefore we don't bother noting returns as possible exits. We also
don't bother with gotos. */
static void
begin_maybe_infinite_loop (tree cond)
{
/* Only track this while parsing a function, not during instantiation. */
if (!cfun || (DECL_TEMPLATE_INSTANTIATION (current_function_decl)
&& !processing_template_decl))
return;
bool maybe_infinite = true;
if (cond)
{
cond = fold_non_dependent_expr (cond);
maybe_infinite = integer_nonzerop (cond);
}
vec_safe_push (cp_function_chain->infinite_loops,
maybe_infinite ? error_mark_node : NULL_TREE);
}
/* A break is a possible exit for the current loop. */
void
break_maybe_infinite_loop (void)
{
if (!cfun)
return;
cp_function_chain->infinite_loops->last() = NULL_TREE;
}
/* If we reach the end of the loop without seeing a possible exit, we have
an infinite loop. */
static void
end_maybe_infinite_loop (tree cond)
{
if (!cfun || (DECL_TEMPLATE_INSTANTIATION (current_function_decl)
&& !processing_template_decl))
return;
tree current = cp_function_chain->infinite_loops->pop();
if (current != NULL_TREE)
{
cond = fold_non_dependent_expr (cond);
if (integer_nonzerop (cond))
current_function_infinite_loop = 1;
}
}
/* Begin a conditional that might contain a declaration. When generating
normal code, we want the declaration to appear before the statement
containing the conditional. When generating template code, we want the
conditional to be rendered as the raw DECL_EXPR. */
static void
begin_cond (tree *cond_p)
{
if (processing_template_decl)
*cond_p = push_stmt_list ();
}
/* Finish such a conditional. */
static void
finish_cond (tree *cond_p, tree expr)
{
if (processing_template_decl)
{
tree cond = pop_stmt_list (*cond_p);
if (expr == NULL_TREE)
/* Empty condition in 'for'. */
gcc_assert (empty_expr_stmt_p (cond));
else if (check_for_bare_parameter_packs (expr))
expr = error_mark_node;
else if (!empty_expr_stmt_p (cond))
expr = build2 (COMPOUND_EXPR, TREE_TYPE (expr), cond, expr);
}
*cond_p = expr;
}
/* If *COND_P specifies a conditional with a declaration, transform the
loop such that
while (A x = 42) { }
for (; A x = 42;) { }
becomes
while (true) { A x = 42; if (!x) break; }
for (;;) { A x = 42; if (!x) break; }
The statement list for BODY will be empty if the conditional did
not declare anything. */
static void
simplify_loop_decl_cond (tree *cond_p, tree body)
{
tree cond, if_stmt;
if (!TREE_SIDE_EFFECTS (body))
return;
cond = *cond_p;
*cond_p = boolean_true_node;
if_stmt = begin_if_stmt ();
cond = cp_build_unary_op (TRUTH_NOT_EXPR, cond, 0, tf_warning_or_error);
finish_if_stmt_cond (cond, if_stmt);
finish_break_stmt ();
finish_then_clause (if_stmt);
finish_if_stmt (if_stmt);
}
/* Finish a goto-statement. */
tree
finish_goto_stmt (tree destination)
{
if (identifier_p (destination))
destination = lookup_label (destination);
/* We warn about unused labels with -Wunused. That means we have to
mark the used labels as used. */
if (TREE_CODE (destination) == LABEL_DECL)
TREE_USED (destination) = 1;
else
{
if (check_no_cilk (destination,
"Cilk array notation cannot be used as a computed goto expression",
"%<_Cilk_spawn%> statement cannot be used as a computed goto expression"))
destination = error_mark_node;
destination = mark_rvalue_use (destination);
if (!processing_template_decl)
{
destination = cp_convert (ptr_type_node, destination,
tf_warning_or_error);
if (error_operand_p (destination))
return NULL_TREE;
destination
= fold_build_cleanup_point_expr (TREE_TYPE (destination),
destination);
}
}
check_goto (destination);
return add_stmt (build_stmt (input_location, GOTO_EXPR, destination));
}
/* COND is the condition-expression for an if, while, etc.,
statement. Convert it to a boolean value, if appropriate.
In addition, verify sequence points if -Wsequence-point is enabled. */
static tree
maybe_convert_cond (tree cond)
{
/* Empty conditions remain empty. */
if (!cond)
return NULL_TREE;
/* Wait until we instantiate templates before doing conversion. */
if (processing_template_decl)
return cond;
if (warn_sequence_point)
verify_sequence_points (cond);
/* Do the conversion. */
cond = convert_from_reference (cond);
if (TREE_CODE (cond) == MODIFY_EXPR
&& !TREE_NO_WARNING (cond)
&& warn_parentheses)
{
warning (OPT_Wparentheses,
"suggest parentheses around assignment used as truth value");
TREE_NO_WARNING (cond) = 1;
}
return condition_conversion (cond);
}
/* Finish an expression-statement, whose EXPRESSION is as indicated. */
tree
finish_expr_stmt (tree expr)
{
tree r = NULL_TREE;
if (expr != NULL_TREE)
{
if (!processing_template_decl)
{
if (warn_sequence_point)
verify_sequence_points (expr);
expr = convert_to_void (expr, ICV_STATEMENT, tf_warning_or_error);
}
else if (!type_dependent_expression_p (expr))
convert_to_void (build_non_dependent_expr (expr), ICV_STATEMENT,
tf_warning_or_error);
if (check_for_bare_parameter_packs (expr))
expr = error_mark_node;
/* Simplification of inner statement expressions, compound exprs,
etc can result in us already having an EXPR_STMT. */
if (TREE_CODE (expr) != CLEANUP_POINT_EXPR)
{
if (TREE_CODE (expr) != EXPR_STMT)
expr = build_stmt (input_location, EXPR_STMT, expr);
expr = maybe_cleanup_point_expr_void (expr);
}
r = add_stmt (expr);
}
return r;
}
/* Begin an if-statement. Returns a newly created IF_STMT if
appropriate. */
tree
begin_if_stmt (void)
{
tree r, scope;
scope = do_pushlevel (sk_cond);
r = build_stmt (input_location, IF_STMT, NULL_TREE,
NULL_TREE, NULL_TREE, scope);
begin_cond (&IF_COND (r));
return r;
}
/* Process the COND of an if-statement, which may be given by
IF_STMT. */
void
finish_if_stmt_cond (tree cond, tree if_stmt)
{
finish_cond (&IF_COND (if_stmt), maybe_convert_cond (cond));
add_stmt (if_stmt);
THEN_CLAUSE (if_stmt) = push_stmt_list ();
}
/* Finish the then-clause of an if-statement, which may be given by
IF_STMT. */
tree
finish_then_clause (tree if_stmt)
{
THEN_CLAUSE (if_stmt) = pop_stmt_list (THEN_CLAUSE (if_stmt));
return if_stmt;
}
/* Begin the else-clause of an if-statement. */
void
begin_else_clause (tree if_stmt)
{
ELSE_CLAUSE (if_stmt) = push_stmt_list ();
}
/* Finish the else-clause of an if-statement, which may be given by
IF_STMT. */
void
finish_else_clause (tree if_stmt)
{
ELSE_CLAUSE (if_stmt) = pop_stmt_list (ELSE_CLAUSE (if_stmt));
}
/* Finish an if-statement. */
void
finish_if_stmt (tree if_stmt)
{
tree scope = IF_SCOPE (if_stmt);
IF_SCOPE (if_stmt) = NULL;
add_stmt (do_poplevel (scope));
}
/* Begin a while-statement. Returns a newly created WHILE_STMT if
appropriate. */
tree
begin_while_stmt (void)
{
tree r;
r = build_stmt (input_location, WHILE_STMT, NULL_TREE, NULL_TREE);
add_stmt (r);
WHILE_BODY (r) = do_pushlevel (sk_block);
begin_cond (&WHILE_COND (r));
return r;
}
/* Process the COND of a while-statement, which may be given by
WHILE_STMT. */
void
finish_while_stmt_cond (tree cond, tree while_stmt, bool ivdep)
{
if (check_no_cilk (cond,
"Cilk array notation cannot be used as a condition for while statement",
"%<_Cilk_spawn%> statement cannot be used as a condition for while statement"))
cond = error_mark_node;
cond = maybe_convert_cond (cond);
finish_cond (&WHILE_COND (while_stmt), cond);
begin_maybe_infinite_loop (cond);
if (ivdep && cond != error_mark_node)
WHILE_COND (while_stmt) = build2 (ANNOTATE_EXPR,
TREE_TYPE (WHILE_COND (while_stmt)),
WHILE_COND (while_stmt),
build_int_cst (integer_type_node,
annot_expr_ivdep_kind));
simplify_loop_decl_cond (&WHILE_COND (while_stmt), WHILE_BODY (while_stmt));
}
/* Finish a while-statement, which may be given by WHILE_STMT. */
void
finish_while_stmt (tree while_stmt)
{
end_maybe_infinite_loop (boolean_true_node);
WHILE_BODY (while_stmt) = do_poplevel (WHILE_BODY (while_stmt));
}
/* Begin a do-statement. Returns a newly created DO_STMT if
appropriate. */
tree
begin_do_stmt (void)
{
tree r = build_stmt (input_location, DO_STMT, NULL_TREE, NULL_TREE);
begin_maybe_infinite_loop (boolean_true_node);
add_stmt (r);
DO_BODY (r) = push_stmt_list ();
return r;
}
/* Finish the body of a do-statement, which may be given by DO_STMT. */
void
finish_do_body (tree do_stmt)
{
tree body = DO_BODY (do_stmt) = pop_stmt_list (DO_BODY (do_stmt));
if (TREE_CODE (body) == STATEMENT_LIST && STATEMENT_LIST_TAIL (body))
body = STATEMENT_LIST_TAIL (body)->stmt;
if (IS_EMPTY_STMT (body))
warning (OPT_Wempty_body,
"suggest explicit braces around empty body in % statement");
}
/* Finish a do-statement, which may be given by DO_STMT, and whose
COND is as indicated. */
void
finish_do_stmt (tree cond, tree do_stmt, bool ivdep)
{
if (check_no_cilk (cond,
"Cilk array notation cannot be used as a condition for a do-while statement",
"%<_Cilk_spawn%> statement cannot be used as a condition for a do-while statement"))
cond = error_mark_node;
cond = maybe_convert_cond (cond);
end_maybe_infinite_loop (cond);
if (ivdep && cond != error_mark_node)
cond = build2 (ANNOTATE_EXPR, TREE_TYPE (cond), cond,
build_int_cst (integer_type_node, annot_expr_ivdep_kind));
DO_COND (do_stmt) = cond;
}
/* Finish a return-statement. The EXPRESSION returned, if any, is as
indicated. */
tree
finish_return_stmt (tree expr)
{
tree r;
bool no_warning;
expr = check_return_expr (expr, &no_warning);
if (error_operand_p (expr)
|| (flag_openmp && !check_omp_return ()))
{
/* Suppress -Wreturn-type for this function. */
if (warn_return_type)
TREE_NO_WARNING (current_function_decl) = true;
return error_mark_node;
}
if (!processing_template_decl)
{
if (warn_sequence_point)
verify_sequence_points (expr);
if (DECL_DESTRUCTOR_P (current_function_decl)
|| (DECL_CONSTRUCTOR_P (current_function_decl)
&& targetm.cxx.cdtor_returns_this ()))
{
/* Similarly, all destructors must run destructors for
base-classes before returning. So, all returns in a
destructor get sent to the DTOR_LABEL; finish_function emits
code to return a value there. */
return finish_goto_stmt (cdtor_label);
}
}
r = build_stmt (input_location, RETURN_EXPR, expr);
TREE_NO_WARNING (r) |= no_warning;
r = maybe_cleanup_point_expr_void (r);
r = add_stmt (r);
return r;
}
/* Begin the scope of a for-statement or a range-for-statement.
Both the returned trees are to be used in a call to
begin_for_stmt or begin_range_for_stmt. */
tree
begin_for_scope (tree *init)
{
tree scope = NULL_TREE;
if (flag_new_for_scope > 0)
scope = do_pushlevel (sk_for);
if (processing_template_decl)
*init = push_stmt_list ();
else
*init = NULL_TREE;
return scope;
}
/* Begin a for-statement. Returns a new FOR_STMT.
SCOPE and INIT should be the return of begin_for_scope,
or both NULL_TREE */
tree
begin_for_stmt (tree scope, tree init)
{
tree r;
r = build_stmt (input_location, FOR_STMT, NULL_TREE, NULL_TREE,
NULL_TREE, NULL_TREE, NULL_TREE);
if (scope == NULL_TREE)
{
gcc_assert (!init || !(flag_new_for_scope > 0));
if (!init)
scope = begin_for_scope (&init);
}
FOR_INIT_STMT (r) = init;
FOR_SCOPE (r) = scope;
return r;
}
/* Finish the for-init-statement of a for-statement, which may be
given by FOR_STMT. */
void
finish_for_init_stmt (tree for_stmt)
{
if (processing_template_decl)
FOR_INIT_STMT (for_stmt) = pop_stmt_list (FOR_INIT_STMT (for_stmt));
add_stmt (for_stmt);
FOR_BODY (for_stmt) = do_pushlevel (sk_block);
begin_cond (&FOR_COND (for_stmt));
}
/* Finish the COND of a for-statement, which may be given by
FOR_STMT. */
void
finish_for_cond (tree cond, tree for_stmt, bool ivdep)
{
if (check_no_cilk (cond,
"Cilk array notation cannot be used in a condition for a for-loop",
"%<_Cilk_spawn%> statement cannot be used in a condition for a for-loop"))
cond = error_mark_node;
cond = maybe_convert_cond (cond);
finish_cond (&FOR_COND (for_stmt), cond);
begin_maybe_infinite_loop (cond);
if (ivdep && cond != error_mark_node)
FOR_COND (for_stmt) = build2 (ANNOTATE_EXPR,
TREE_TYPE (FOR_COND (for_stmt)),
FOR_COND (for_stmt),
build_int_cst (integer_type_node,
annot_expr_ivdep_kind));
simplify_loop_decl_cond (&FOR_COND (for_stmt), FOR_BODY (for_stmt));
}
/* Finish the increment-EXPRESSION in a for-statement, which may be
given by FOR_STMT. */
void
finish_for_expr (tree expr, tree for_stmt)
{
if (!expr)
return;
/* If EXPR is an overloaded function, issue an error; there is no
context available to use to perform overload resolution. */
if (type_unknown_p (expr))
{
cxx_incomplete_type_error (expr, TREE_TYPE (expr));
expr = error_mark_node;
}
if (!processing_template_decl)
{
if (warn_sequence_point)
verify_sequence_points (expr);
expr = convert_to_void (expr, ICV_THIRD_IN_FOR,
tf_warning_or_error);
}
else if (!type_dependent_expression_p (expr))
convert_to_void (build_non_dependent_expr (expr), ICV_THIRD_IN_FOR,
tf_warning_or_error);
expr = maybe_cleanup_point_expr_void (expr);
if (check_for_bare_parameter_packs (expr))
expr = error_mark_node;
FOR_EXPR (for_stmt) = expr;
}
/* Finish the body of a for-statement, which may be given by
FOR_STMT. The increment-EXPR for the loop must be
provided.
It can also finish RANGE_FOR_STMT. */
void
finish_for_stmt (tree for_stmt)
{
end_maybe_infinite_loop (boolean_true_node);
if (TREE_CODE (for_stmt) == RANGE_FOR_STMT)
RANGE_FOR_BODY (for_stmt) = do_poplevel (RANGE_FOR_BODY (for_stmt));
else
FOR_BODY (for_stmt) = do_poplevel (FOR_BODY (for_stmt));
/* Pop the scope for the body of the loop. */
if (flag_new_for_scope > 0)
{
tree scope;
tree *scope_ptr = (TREE_CODE (for_stmt) == RANGE_FOR_STMT
? &RANGE_FOR_SCOPE (for_stmt)
: &FOR_SCOPE (for_stmt));
scope = *scope_ptr;
*scope_ptr = NULL;
add_stmt (do_poplevel (scope));
}
}
/* Begin a range-for-statement. Returns a new RANGE_FOR_STMT.
SCOPE and INIT should be the return of begin_for_scope,
or both NULL_TREE .
To finish it call finish_for_stmt(). */
tree
begin_range_for_stmt (tree scope, tree init)
{
tree r;
begin_maybe_infinite_loop (boolean_false_node);
r = build_stmt (input_location, RANGE_FOR_STMT,
NULL_TREE, NULL_TREE, NULL_TREE, NULL_TREE);
if (scope == NULL_TREE)
{
gcc_assert (!init || !(flag_new_for_scope > 0));
if (!init)
scope = begin_for_scope (&init);
}
/* RANGE_FOR_STMTs do not use nor save the init tree, so we
pop it now. */
if (init)
pop_stmt_list (init);
RANGE_FOR_SCOPE (r) = scope;
return r;
}
/* Finish the head of a range-based for statement, which may
be given by RANGE_FOR_STMT. DECL must be the declaration
and EXPR must be the loop expression. */
void
finish_range_for_decl (tree range_for_stmt, tree decl, tree expr)
{
RANGE_FOR_DECL (range_for_stmt) = decl;
RANGE_FOR_EXPR (range_for_stmt) = expr;
add_stmt (range_for_stmt);
RANGE_FOR_BODY (range_for_stmt) = do_pushlevel (sk_block);
}
/* Finish a break-statement. */
tree
finish_break_stmt (void)
{
/* In switch statements break is sometimes stylistically used after
a return statement. This can lead to spurious warnings about
control reaching the end of a non-void function when it is
inlined. Note that we are calling block_may_fallthru with
language specific tree nodes; this works because
block_may_fallthru returns true when given something it does not
understand. */
if (!block_may_fallthru (cur_stmt_list))
return void_node;
return add_stmt (build_stmt (input_location, BREAK_STMT));
}
/* Finish a continue-statement. */
tree
finish_continue_stmt (void)
{
return add_stmt (build_stmt (input_location, CONTINUE_STMT));
}
/* Begin a switch-statement. Returns a new SWITCH_STMT if
appropriate. */
tree
begin_switch_stmt (void)
{
tree r, scope;
scope = do_pushlevel (sk_cond);
r = build_stmt (input_location, SWITCH_STMT, NULL_TREE, NULL_TREE, NULL_TREE, scope);
begin_cond (&SWITCH_STMT_COND (r));
return r;
}
/* Finish the cond of a switch-statement. */
void
finish_switch_cond (tree cond, tree switch_stmt)
{
tree orig_type = NULL;
if (check_no_cilk (cond,
"Cilk array notation cannot be used as a condition for switch statement",
"%<_Cilk_spawn%> statement cannot be used as a condition for switch statement"))
cond = error_mark_node;
if (!processing_template_decl)
{
/* Convert the condition to an integer or enumeration type. */
cond = build_expr_type_conversion (WANT_INT | WANT_ENUM, cond, true);
if (cond == NULL_TREE)
{
error ("switch quantity not an integer");
cond = error_mark_node;
}
/* We want unlowered type here to handle enum bit-fields. */
orig_type = unlowered_expr_type (cond);
if (TREE_CODE (orig_type) != ENUMERAL_TYPE)
orig_type = TREE_TYPE (cond);
if (cond != error_mark_node)
{
/* [stmt.switch]
Integral promotions are performed. */
cond = perform_integral_promotions (cond);
cond = maybe_cleanup_point_expr (cond);
}
}
if (check_for_bare_parameter_packs (cond))
cond = error_mark_node;
else if (!processing_template_decl && warn_sequence_point)
verify_sequence_points (cond);
finish_cond (&SWITCH_STMT_COND (switch_stmt), cond);
SWITCH_STMT_TYPE (switch_stmt) = orig_type;
add_stmt (switch_stmt);
push_switch (switch_stmt);
SWITCH_STMT_BODY (switch_stmt) = push_stmt_list ();
}
/* Finish the body of a switch-statement, which may be given by
SWITCH_STMT. The COND to switch on is indicated. */
void
finish_switch_stmt (tree switch_stmt)
{
tree scope;
SWITCH_STMT_BODY (switch_stmt) =
pop_stmt_list (SWITCH_STMT_BODY (switch_stmt));
pop_switch ();
scope = SWITCH_STMT_SCOPE (switch_stmt);
SWITCH_STMT_SCOPE (switch_stmt) = NULL;
add_stmt (do_poplevel (scope));
}
/* Begin a try-block. Returns a newly-created TRY_BLOCK if
appropriate. */
tree
begin_try_block (void)
{
tree r = build_stmt (input_location, TRY_BLOCK, NULL_TREE, NULL_TREE);
add_stmt (r);
TRY_STMTS (r) = push_stmt_list ();
return r;
}
/* Likewise, for a function-try-block. The block returned in
*COMPOUND_STMT is an artificial outer scope, containing the
function-try-block. */
tree
begin_function_try_block (tree *compound_stmt)
{
tree r;
/* This outer scope does not exist in the C++ standard, but we need
a place to put __FUNCTION__ and similar variables. */
*compound_stmt = begin_compound_stmt (0);
r = begin_try_block ();
FN_TRY_BLOCK_P (r) = 1;
return r;
}
/* Finish a try-block, which may be given by TRY_BLOCK. */
void
finish_try_block (tree try_block)
{
TRY_STMTS (try_block) = pop_stmt_list (TRY_STMTS (try_block));
TRY_HANDLERS (try_block) = push_stmt_list ();
}
/* Finish the body of a cleanup try-block, which may be given by
TRY_BLOCK. */
void
finish_cleanup_try_block (tree try_block)
{
TRY_STMTS (try_block) = pop_stmt_list (TRY_STMTS (try_block));
}
/* Finish an implicitly generated try-block, with a cleanup is given
by CLEANUP. */
void
finish_cleanup (tree cleanup, tree try_block)
{
TRY_HANDLERS (try_block) = cleanup;
CLEANUP_P (try_block) = 1;
}
/* Likewise, for a function-try-block. */
void
finish_function_try_block (tree try_block)
{
finish_try_block (try_block);
/* FIXME : something queer about CTOR_INITIALIZER somehow following
the try block, but moving it inside. */
in_function_try_handler = 1;
}
/* Finish a handler-sequence for a try-block, which may be given by
TRY_BLOCK. */
void
finish_handler_sequence (tree try_block)
{
TRY_HANDLERS (try_block) = pop_stmt_list (TRY_HANDLERS (try_block));
check_handlers (TRY_HANDLERS (try_block));
}
/* Finish the handler-seq for a function-try-block, given by
TRY_BLOCK. COMPOUND_STMT is the outer block created by
begin_function_try_block. */
void
finish_function_handler_sequence (tree try_block, tree compound_stmt)
{
in_function_try_handler = 0;
finish_handler_sequence (try_block);
finish_compound_stmt (compound_stmt);
}
/* Begin a handler. Returns a HANDLER if appropriate. */
tree
begin_handler (void)
{
tree r;
r = build_stmt (input_location, HANDLER, NULL_TREE, NULL_TREE);
add_stmt (r);
/* Create a binding level for the eh_info and the exception object
cleanup. */
HANDLER_BODY (r) = do_pushlevel (sk_catch);
return r;
}
/* Finish the handler-parameters for a handler, which may be given by
HANDLER. DECL is the declaration for the catch parameter, or NULL
if this is a `catch (...)' clause. */
void
finish_handler_parms (tree decl, tree handler)
{
tree type = NULL_TREE;
if (processing_template_decl)
{
if (decl)
{
decl = pushdecl (decl);
decl = push_template_decl (decl);
HANDLER_PARMS (handler) = decl;
type = TREE_TYPE (decl);
}
}
else
type = expand_start_catch_block (decl);
HANDLER_TYPE (handler) = type;
}
/* Finish a handler, which may be given by HANDLER. The BLOCKs are
the return value from the matching call to finish_handler_parms. */
void
finish_handler (tree handler)
{
if (!processing_template_decl)
expand_end_catch_block ();
HANDLER_BODY (handler) = do_poplevel (HANDLER_BODY (handler));
}
/* Begin a compound statement. FLAGS contains some bits that control the
behavior and context. If BCS_NO_SCOPE is set, the compound statement
does not define a scope. If BCS_FN_BODY is set, this is the outermost
block of a function. If BCS_TRY_BLOCK is set, this is the block
created on behalf of a TRY statement. Returns a token to be passed to
finish_compound_stmt. */
tree
begin_compound_stmt (unsigned int flags)
{
tree r;
if (flags & BCS_NO_SCOPE)
{
r = push_stmt_list ();
STATEMENT_LIST_NO_SCOPE (r) = 1;
/* Normally, we try hard to keep the BLOCK for a statement-expression.
But, if it's a statement-expression with a scopeless block, there's
nothing to keep, and we don't want to accidentally keep a block
*inside* the scopeless block. */
keep_next_level (false);
}
else
r = do_pushlevel (flags & BCS_TRY_BLOCK ? sk_try : sk_block);
/* When processing a template, we need to remember where the braces were,
so that we can set up identical scopes when instantiating the template
later. BIND_EXPR is a handy candidate for this.
Note that do_poplevel won't create a BIND_EXPR itself here (and thus
result in nested BIND_EXPRs), since we don't build BLOCK nodes when
processing templates. */
if (processing_template_decl)
{
r = build3 (BIND_EXPR, NULL, NULL, r, NULL);
BIND_EXPR_TRY_BLOCK (r) = (flags & BCS_TRY_BLOCK) != 0;
BIND_EXPR_BODY_BLOCK (r) = (flags & BCS_FN_BODY) != 0;
TREE_SIDE_EFFECTS (r) = 1;
}
return r;
}
/* Finish a compound-statement, which is given by STMT. */
void
finish_compound_stmt (tree stmt)
{
if (TREE_CODE (stmt) == BIND_EXPR)
{
tree body = do_poplevel (BIND_EXPR_BODY (stmt));
/* If the STATEMENT_LIST is empty and this BIND_EXPR isn't special,
discard the BIND_EXPR so it can be merged with the containing
STATEMENT_LIST. */
if (TREE_CODE (body) == STATEMENT_LIST
&& STATEMENT_LIST_HEAD (body) == NULL
&& !BIND_EXPR_BODY_BLOCK (stmt)
&& !BIND_EXPR_TRY_BLOCK (stmt))
stmt = body;
else
BIND_EXPR_BODY (stmt) = body;
}
else if (STATEMENT_LIST_NO_SCOPE (stmt))
stmt = pop_stmt_list (stmt);
else
{
/* Destroy any ObjC "super" receivers that may have been
created. */
objc_clear_super_receiver ();
stmt = do_poplevel (stmt);
}
/* ??? See c_end_compound_stmt wrt statement expressions. */
add_stmt (stmt);
}
/* Finish an asm-statement, whose components are a STRING, some
OUTPUT_OPERANDS, some INPUT_OPERANDS, some CLOBBERS and some
LABELS. Also note whether the asm-statement should be
considered volatile. */
tree
finish_asm_stmt (int volatile_p, tree string, tree output_operands,
tree input_operands, tree clobbers, tree labels)
{
tree r;
tree t;
int ninputs = list_length (input_operands);
int noutputs = list_length (output_operands);
if (!processing_template_decl)
{
const char *constraint;
const char **oconstraints;
bool allows_mem, allows_reg, is_inout;
tree operand;
int i;
oconstraints = XALLOCAVEC (const char *, noutputs);
string = resolve_asm_operand_names (string, output_operands,
input_operands, labels);
for (i = 0, t = output_operands; t; t = TREE_CHAIN (t), ++i)
{
operand = TREE_VALUE (t);
/* ??? Really, this should not be here. Users should be using a
proper lvalue, dammit. But there's a long history of using
casts in the output operands. In cases like longlong.h, this
becomes a primitive form of typechecking -- if the cast can be
removed, then the output operand had a type of the proper width;
otherwise we'll get an error. Gross, but ... */
STRIP_NOPS (operand);
operand = mark_lvalue_use (operand);
if (!lvalue_or_else (operand, lv_asm, tf_warning_or_error))
operand = error_mark_node;
if (operand != error_mark_node
&& (TREE_READONLY (operand)
|| CP_TYPE_CONST_P (TREE_TYPE (operand))
/* Functions are not modifiable, even though they are
lvalues. */
|| TREE_CODE (TREE_TYPE (operand)) == FUNCTION_TYPE
|| TREE_CODE (TREE_TYPE (operand)) == METHOD_TYPE
/* If it's an aggregate and any field is const, then it is
effectively const. */
|| (CLASS_TYPE_P (TREE_TYPE (operand))
&& C_TYPE_FIELDS_READONLY (TREE_TYPE (operand)))))
cxx_readonly_error (operand, lv_asm);
constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
oconstraints[i] = constraint;
if (parse_output_constraint (&constraint, i, ninputs, noutputs,
&allows_mem, &allows_reg, &is_inout))
{
/* If the operand is going to end up in memory,
mark it addressable. */
if (!allows_reg && !cxx_mark_addressable (operand))
operand = error_mark_node;
}
else
operand = error_mark_node;
TREE_VALUE (t) = operand;
}
for (i = 0, t = input_operands; t; ++i, t = TREE_CHAIN (t))
{
constraint = TREE_STRING_POINTER (TREE_VALUE (TREE_PURPOSE (t)));
bool constraint_parsed
= parse_input_constraint (&constraint, i, ninputs, noutputs, 0,
oconstraints, &allows_mem, &allows_reg);
/* If the operand is going to end up in memory, don't call
decay_conversion. */
if (constraint_parsed && !allows_reg && allows_mem)
operand = mark_lvalue_use (TREE_VALUE (t));
else
operand = decay_conversion (TREE_VALUE (t), tf_warning_or_error);
/* If the type of the operand hasn't been determined (e.g.,
because it involves an overloaded function), then issue
an error message. There's no context available to
resolve the overloading. */
if (TREE_TYPE (operand) == unknown_type_node)
{
error ("type of asm operand %qE could not be determined",
TREE_VALUE (t));
operand = error_mark_node;
}
if (constraint_parsed)
{
/* If the operand is going to end up in memory,
mark it addressable. */
if (!allows_reg && allows_mem)
{
/* Strip the nops as we allow this case. FIXME, this really
should be rejected or made deprecated. */
STRIP_NOPS (operand);
if (!cxx_mark_addressable (operand))
operand = error_mark_node;
}
else if (!allows_reg && !allows_mem)
{
/* If constraint allows neither register nor memory,
try harder to get a constant. */
tree constop = maybe_constant_value (operand);
if (TREE_CONSTANT (constop))
operand = constop;
}
}
else
operand = error_mark_node;
TREE_VALUE (t) = operand;
}
}
r = build_stmt (input_location, ASM_EXPR, string,
output_operands, input_operands,
clobbers, labels);
ASM_VOLATILE_P (r) = volatile_p || noutputs == 0;
r = maybe_cleanup_point_expr_void (r);
return add_stmt (r);
}
/* Finish a label with the indicated NAME. Returns the new label. */
tree
finish_label_stmt (tree name)
{
tree decl = define_label (input_location, name);
if (decl == error_mark_node)
return error_mark_node;
add_stmt (build_stmt (input_location, LABEL_EXPR, decl));
return decl;
}
/* Finish a series of declarations for local labels. G++ allows users
to declare "local" labels, i.e., labels with scope. This extension
is useful when writing code involving statement-expressions. */
void
finish_label_decl (tree name)
{
if (!at_function_scope_p ())
{
error ("__label__ declarations are only allowed in function scopes");
return;
}
add_decl_expr (declare_local_label (name));
}
/* When DECL goes out of scope, make sure that CLEANUP is executed. */
void
finish_decl_cleanup (tree decl, tree cleanup)
{
push_cleanup (decl, cleanup, false);
}
/* If the current scope exits with an exception, run CLEANUP. */
void
finish_eh_cleanup (tree cleanup)
{
push_cleanup (NULL, cleanup, true);
}
/* The MEM_INITS is a list of mem-initializers, in reverse of the
order they were written by the user. Each node is as for
emit_mem_initializers. */
void
finish_mem_initializers (tree mem_inits)
{
/* Reorder the MEM_INITS so that they are in the order they appeared
in the source program. */
mem_inits = nreverse (mem_inits);
if (processing_template_decl)
{
tree mem;
for (mem = mem_inits; mem; mem = TREE_CHAIN (mem))
{
/* If the TREE_PURPOSE is a TYPE_PACK_EXPANSION, skip the
check for bare parameter packs in the TREE_VALUE, because
any parameter packs in the TREE_VALUE have already been
bound as part of the TREE_PURPOSE. See
make_pack_expansion for more information. */
if (TREE_CODE (TREE_PURPOSE (mem)) != TYPE_PACK_EXPANSION
&& check_for_bare_parameter_packs (TREE_VALUE (mem)))
TREE_VALUE (mem) = error_mark_node;
}
add_stmt (build_min_nt_loc (UNKNOWN_LOCATION,
CTOR_INITIALIZER, mem_inits));
}
else
emit_mem_initializers (mem_inits);
}
/* Obfuscate EXPR if it looks like an id-expression or member access so
that the call to finish_decltype in do_auto_deduction will give the
right result. */
tree
force_paren_expr (tree expr)
{
/* This is only needed for decltype(auto) in C++14. */
if (cxx_dialect < cxx14)
return expr;
/* If we're in unevaluated context, we can't be deducing a
return/initializer type, so we don't need to mess with this. */
if (cp_unevaluated_operand)
return expr;
if (!DECL_P (expr) && TREE_CODE (expr) != COMPONENT_REF
&& TREE_CODE (expr) != SCOPE_REF)
return expr;
if (TREE_CODE (expr) == COMPONENT_REF)
REF_PARENTHESIZED_P (expr) = true;
else if (type_dependent_expression_p (expr))
expr = build1 (PAREN_EXPR, TREE_TYPE (expr), expr);
else
{
cp_lvalue_kind kind = lvalue_kind (expr);
if ((kind & ~clk_class) != clk_none)
{
tree type = unlowered_expr_type (expr);
bool rval = !!(kind & clk_rvalueref);
type = cp_build_reference_type (type, rval);
/* This inhibits warnings in, eg, cxx_mark_addressable
(c++/60955). */
warning_sentinel s (extra_warnings);
expr = build_static_cast (type, expr, tf_error);
if (expr != error_mark_node)
REF_PARENTHESIZED_P (expr) = true;
}
}
return expr;
}
/* Finish a parenthesized expression EXPR. */
tree
finish_parenthesized_expr (tree expr)
{
if (EXPR_P (expr))
/* This inhibits warnings in c_common_truthvalue_conversion. */
TREE_NO_WARNING (expr) = 1;
if (TREE_CODE (expr) == OFFSET_REF
|| TREE_CODE (expr) == SCOPE_REF)
/* [expr.unary.op]/3 The qualified id of a pointer-to-member must not be
enclosed in parentheses. */
PTRMEM_OK_P (expr) = 0;
if (TREE_CODE (expr) == STRING_CST)
PAREN_STRING_LITERAL_P (expr) = 1;
expr = force_paren_expr (expr);
return expr;
}
/* Finish a reference to a non-static data member (DECL) that is not
preceded by `.' or `->'. */
tree
finish_non_static_data_member (tree decl, tree object, tree qualifying_scope)
{
gcc_assert (TREE_CODE (decl) == FIELD_DECL);
if (!object)
{
tree scope = qualifying_scope;
if (scope == NULL_TREE)
scope = context_for_name_lookup (decl);
object = maybe_dummy_object (scope, NULL);
}
object = maybe_resolve_dummy (object, true);
if (object == error_mark_node)
return error_mark_node;
/* DR 613/850: Can use non-static data members without an associated
object in sizeof/decltype/alignof. */
if (is_dummy_object (object) && cp_unevaluated_operand == 0
&& (!processing_template_decl || !current_class_ref))
{
if (current_function_decl
&& DECL_STATIC_FUNCTION_P (current_function_decl))
error ("invalid use of member %qD in static member function", decl);
else
error ("invalid use of non-static data member %qD", decl);
inform (DECL_SOURCE_LOCATION (decl), "declared here");
return error_mark_node;
}
if (current_class_ptr)
TREE_USED (current_class_ptr) = 1;
if (processing_template_decl && !qualifying_scope)
{
tree type = TREE_TYPE (decl);
if (TREE_CODE (type) == REFERENCE_TYPE)
/* Quals on the object don't matter. */;
else if (PACK_EXPANSION_P (type))
/* Don't bother trying to represent this. */
type = NULL_TREE;
else
{
/* Set the cv qualifiers. */
int quals = cp_type_quals (TREE_TYPE (object));
if (DECL_MUTABLE_P (decl))
quals &= ~TYPE_QUAL_CONST;
quals |= cp_type_quals (TREE_TYPE (decl));
type = cp_build_qualified_type (type, quals);
}
return (convert_from_reference
(build_min (COMPONENT_REF, type, object, decl, NULL_TREE)));
}
/* If PROCESSING_TEMPLATE_DECL is nonzero here, then
QUALIFYING_SCOPE is also non-null. Wrap this in a SCOPE_REF
for now. */
else if (processing_template_decl)
return build_qualified_name (TREE_TYPE (decl),
qualifying_scope,
decl,
/*template_p=*/false);
else
{
tree access_type = TREE_TYPE (object);
perform_or_defer_access_check (TYPE_BINFO (access_type), decl,
decl, tf_warning_or_error);
/* If the data member was named `C::M', convert `*this' to `C'
first. */
if (qualifying_scope)
{
tree binfo = NULL_TREE;
object = build_scoped_ref (object, qualifying_scope,
&binfo);
}
return build_class_member_access_expr (object, decl,
/*access_path=*/NULL_TREE,
/*preserve_reference=*/false,
tf_warning_or_error);
}
}
/* If we are currently parsing a template and we encountered a typedef
TYPEDEF_DECL that is being accessed though CONTEXT, this function
adds the typedef to a list tied to the current template.
At template instantiation time, that list is walked and access check
performed for each typedef.
LOCATION is the location of the usage point of TYPEDEF_DECL. */
void
add_typedef_to_current_template_for_access_check (tree typedef_decl,
tree context,
location_t location)
{
tree template_info = NULL;
tree cs = current_scope ();
if (!is_typedef_decl (typedef_decl)
|| !context
|| !CLASS_TYPE_P (context)
|| !cs)
return;
if (CLASS_TYPE_P (cs) || TREE_CODE (cs) == FUNCTION_DECL)
template_info = get_template_info (cs);
if (template_info
&& TI_TEMPLATE (template_info)
&& !currently_open_class (context))
append_type_to_template_for_access_check (cs, typedef_decl,
context, location);
}
/* DECL was the declaration to which a qualified-id resolved. Issue
an error message if it is not accessible. If OBJECT_TYPE is
non-NULL, we have just seen `x->' or `x.' and OBJECT_TYPE is the
type of `*x', or `x', respectively. If the DECL was named as
`A::B' then NESTED_NAME_SPECIFIER is `A'. */
void
check_accessibility_of_qualified_id (tree decl,
tree object_type,
tree nested_name_specifier)
{
tree scope;
tree qualifying_type = NULL_TREE;
/* If we are parsing a template declaration and if decl is a typedef,
add it to a list tied to the template.
At template instantiation time, that list will be walked and
access check performed. */
add_typedef_to_current_template_for_access_check (decl,
nested_name_specifier
? nested_name_specifier
: DECL_CONTEXT (decl),
input_location);
/* If we're not checking, return immediately. */
if (deferred_access_no_check)
return;
/* Determine the SCOPE of DECL. */
scope = context_for_name_lookup (decl);
/* If the SCOPE is not a type, then DECL is not a member. */
if (!TYPE_P (scope))
return;
/* Compute the scope through which DECL is being accessed. */
if (object_type
/* OBJECT_TYPE might not be a class type; consider:
class A { typedef int I; };
I *p;
p->A::I::~I();
In this case, we will have "A::I" as the DECL, but "I" as the
OBJECT_TYPE. */
&& CLASS_TYPE_P (object_type)
&& DERIVED_FROM_P (scope, object_type))
/* If we are processing a `->' or `.' expression, use the type of the
left-hand side. */
qualifying_type = object_type;
else if (nested_name_specifier)
{
/* If the reference is to a non-static member of the
current class, treat it as if it were referenced through
`this'. */
tree ct;
if (DECL_NONSTATIC_MEMBER_P (decl)
&& current_class_ptr
&& DERIVED_FROM_P (scope, ct = current_nonlambda_class_type ()))
qualifying_type = ct;
/* Otherwise, use the type indicated by the
nested-name-specifier. */
else
qualifying_type = nested_name_specifier;
}
else
/* Otherwise, the name must be from the current class or one of
its bases. */
qualifying_type = currently_open_derived_class (scope);
if (qualifying_type
/* It is possible for qualifying type to be a TEMPLATE_TYPE_PARM
or similar in a default argument value. */
&& CLASS_TYPE_P (qualifying_type)
&& !dependent_type_p (qualifying_type))
perform_or_defer_access_check (TYPE_BINFO (qualifying_type), decl,
decl, tf_warning_or_error);
}
/* EXPR is the result of a qualified-id. The QUALIFYING_CLASS was the
class named to the left of the "::" operator. DONE is true if this
expression is a complete postfix-expression; it is false if this
expression is followed by '->', '[', '(', etc. ADDRESS_P is true
iff this expression is the operand of '&'. TEMPLATE_P is true iff
the qualified-id was of the form "A::template B". TEMPLATE_ARG_P
is true iff this qualified name appears as a template argument. */
tree
finish_qualified_id_expr (tree qualifying_class,
tree expr,
bool done,
bool address_p,
bool template_p,
bool template_arg_p,
tsubst_flags_t complain)
{
gcc_assert (TYPE_P (qualifying_class));
if (error_operand_p (expr))
return error_mark_node;
if ((DECL_P (expr) || BASELINK_P (expr))
&& !mark_used (expr, complain))
return error_mark_node;
if (template_p)
check_template_keyword (expr);
/* If EXPR occurs as the operand of '&', use special handling that
permits a pointer-to-member. */
if (address_p && done)
{
if (TREE_CODE (expr) == SCOPE_REF)
expr = TREE_OPERAND (expr, 1);
expr = build_offset_ref (qualifying_class, expr,
/*address_p=*/true, complain);
return expr;
}
/* No need to check access within an enum. */
if (TREE_CODE (qualifying_class) == ENUMERAL_TYPE)
return expr;
/* Within the scope of a class, turn references to non-static
members into expression of the form "this->...". */
if (template_arg_p)
/* But, within a template argument, we do not want make the
transformation, as there is no "this" pointer. */
;
else if (TREE_CODE (expr) == FIELD_DECL)
{
push_deferring_access_checks (dk_no_check);
expr = finish_non_static_data_member (expr, NULL_TREE,
qualifying_class);
pop_deferring_access_checks ();
}
else if (BASELINK_P (expr) && !processing_template_decl)
{
/* See if any of the functions are non-static members. */
/* If so, the expression may be relative to 'this'. */
if (!shared_member_p (expr)
&& current_class_ptr
&& DERIVED_FROM_P (qualifying_class,
current_nonlambda_class_type ()))
expr = (build_class_member_access_expr
(maybe_dummy_object (qualifying_class, NULL),
expr,
BASELINK_ACCESS_BINFO (expr),
/*preserve_reference=*/false,
complain));
else if (done)
/* The expression is a qualified name whose address is not
being taken. */
expr = build_offset_ref (qualifying_class, expr, /*address_p=*/false,
complain);
}
else if (BASELINK_P (expr))
;
else
{
/* In a template, return a SCOPE_REF for most qualified-ids
so that we can check access at instantiation time. But if
we're looking at a member of the current instantiation, we
know we have access and building up the SCOPE_REF confuses
non-type template argument handling. */
if (processing_template_decl
&& !currently_open_class (qualifying_class))
expr = build_qualified_name (TREE_TYPE (expr),
qualifying_class, expr,
template_p);
expr = convert_from_reference (expr);
}
return expr;
}
/* Begin a statement-expression. The value returned must be passed to
finish_stmt_expr. */
tree
begin_stmt_expr (void)
{
return push_stmt_list ();
}
/* Process the final expression of a statement expression. EXPR can be
NULL, if the final expression is empty. Return a STATEMENT_LIST
containing all the statements in the statement-expression, or
ERROR_MARK_NODE if there was an error. */
tree
finish_stmt_expr_expr (tree expr, tree stmt_expr)
{
if (error_operand_p (expr))
{
/* The type of the statement-expression is the type of the last
expression. */
TREE_TYPE (stmt_expr) = error_mark_node;
return error_mark_node;
}
/* If the last statement does not have "void" type, then the value
of the last statement is the value of the entire expression. */
if (expr)
{
tree type = TREE_TYPE (expr);
if (processing_template_decl)
{
expr = build_stmt (input_location, EXPR_STMT, expr);
expr = add_stmt (expr);
/* Mark the last statement so that we can recognize it as such at
template-instantiation time. */
EXPR_STMT_STMT_EXPR_RESULT (expr) = 1;
}
else if (VOID_TYPE_P (type))
{
/* Just treat this like an ordinary statement. */
expr = finish_expr_stmt (expr);
}
else
{
/* It actually has a value we need to deal with. First, force it
to be an rvalue so that we won't need to build up a copy
constructor call later when we try to assign it to something. */
expr = force_rvalue (expr, tf_warning_or_error);
if (error_operand_p (expr))
return error_mark_node;
/* Update for array-to-pointer decay. */
type = TREE_TYPE (expr);
/* Wrap it in a CLEANUP_POINT_EXPR and add it to the list like a
normal statement, but don't convert to void or actually add
the EXPR_STMT. */
if (TREE_CODE (expr) != CLEANUP_POINT_EXPR)
expr = maybe_cleanup_point_expr (expr);
add_stmt (expr);
}
/* The type of the statement-expression is the type of the last
expression. */
TREE_TYPE (stmt_expr) = type;
}
return stmt_expr;
}
/* Finish a statement-expression. EXPR should be the value returned
by the previous begin_stmt_expr. Returns an expression
representing the statement-expression. */
tree
finish_stmt_expr (tree stmt_expr, bool has_no_scope)
{
tree type;
tree result;
if (error_operand_p (stmt_expr))
{
pop_stmt_list (stmt_expr);
return error_mark_node;
}
gcc_assert (TREE_CODE (stmt_expr) == STATEMENT_LIST);
type = TREE_TYPE (stmt_expr);
result = pop_stmt_list (stmt_expr);
TREE_TYPE (result) = type;
if (processing_template_decl)
{
result = build_min (STMT_EXPR, type, result);
TREE_SIDE_EFFECTS (result) = 1;
STMT_EXPR_NO_SCOPE (result) = has_no_scope;
}
else if (CLASS_TYPE_P (type))
{
/* Wrap the statement-expression in a TARGET_EXPR so that the
temporary object created by the final expression is destroyed at
the end of the full-expression containing the
statement-expression. */
result = force_target_expr (type, result, tf_warning_or_error);
}
return result;
}
/* Returns the expression which provides the value of STMT_EXPR. */
tree
stmt_expr_value_expr (tree stmt_expr)
{
tree t = STMT_EXPR_STMT (stmt_expr);
if (TREE_CODE (t) == BIND_EXPR)
t = BIND_EXPR_BODY (t);
if (TREE_CODE (t) == STATEMENT_LIST && STATEMENT_LIST_TAIL (t))
t = STATEMENT_LIST_TAIL (t)->stmt;
if (TREE_CODE (t) == EXPR_STMT)
t = EXPR_STMT_EXPR (t);
return t;
}
/* Return TRUE iff EXPR_STMT is an empty list of
expression statements. */
bool
empty_expr_stmt_p (tree expr_stmt)
{
tree body = NULL_TREE;
if (expr_stmt == void_node)
return true;
if (expr_stmt)
{
if (TREE_CODE (expr_stmt) == EXPR_STMT)
body = EXPR_STMT_EXPR (expr_stmt);
else if (TREE_CODE (expr_stmt) == STATEMENT_LIST)
body = expr_stmt;
}
if (body)
{
if (TREE_CODE (body) == STATEMENT_LIST)
return tsi_end_p (tsi_start (body));
else
return empty_expr_stmt_p (body);
}
return false;
}
/* Perform Koenig lookup. FN is the postfix-expression representing
the function (or functions) to call; ARGS are the arguments to the
call. Returns the functions to be considered by overload resolution. */
tree
perform_koenig_lookup (tree fn, vec *args,
tsubst_flags_t complain)
{
tree identifier = NULL_TREE;
tree functions = NULL_TREE;
tree tmpl_args = NULL_TREE;
bool template_id = false;
if (TREE_CODE (fn) == TEMPLATE_ID_EXPR)
{
/* Use a separate flag to handle null args. */
template_id = true;
tmpl_args = TREE_OPERAND (fn, 1);
fn = TREE_OPERAND (fn, 0);
}
/* Find the name of the overloaded function. */
if (identifier_p (fn))
identifier = fn;
else if (is_overloaded_fn (fn))
{
functions = fn;
identifier = DECL_NAME (get_first_fn (functions));
}
else if (DECL_P (fn))
{
functions = fn;
identifier = DECL_NAME (fn);
}
/* A call to a namespace-scope function using an unqualified name.
Do Koenig lookup -- unless any of the arguments are
type-dependent. */
if (!any_type_dependent_arguments_p (args)
&& !any_dependent_template_arguments_p (tmpl_args))
{
fn = lookup_arg_dependent (identifier, functions, args);
if (!fn)
{
/* The unqualified name could not be resolved. */
if (complain)
fn = unqualified_fn_lookup_error (identifier);
else
fn = identifier;
}
}
if (fn && template_id)
fn = build2 (TEMPLATE_ID_EXPR, unknown_type_node, fn, tmpl_args);
return fn;
}
/* Generate an expression for `FN (ARGS)'. This may change the
contents of ARGS.
If DISALLOW_VIRTUAL is true, the call to FN will be not generated
as a virtual call, even if FN is virtual. (This flag is set when
encountering an expression where the function name is explicitly
qualified. For example a call to `X::f' never generates a virtual
call.)
Returns code for the call. */
tree
finish_call_expr (tree fn, vec **args, bool disallow_virtual,
bool koenig_p, tsubst_flags_t complain)
{
tree result;
tree orig_fn;
vec *orig_args = NULL;
if (fn == error_mark_node)
return error_mark_node;
gcc_assert (!TYPE_P (fn));
orig_fn = fn;
if (processing_template_decl)
{
/* If the call expression is dependent, build a CALL_EXPR node
with no type; type_dependent_expression_p recognizes
expressions with no type as being dependent. */
if (type_dependent_expression_p (fn)
|| any_type_dependent_arguments_p (*args)
/* For a non-static member function that doesn't have an
explicit object argument, we need to specifically
test the type dependency of the "this" pointer because it
is not included in *ARGS even though it is considered to
be part of the list of arguments. Note that this is
related to CWG issues 515 and 1005. */
|| (TREE_CODE (fn) != COMPONENT_REF
&& non_static_member_function_p (fn)
&& current_class_ref
&& type_dependent_expression_p (current_class_ref)))
{
result = build_nt_call_vec (fn, *args);
SET_EXPR_LOCATION (result, EXPR_LOC_OR_LOC (fn, input_location));
KOENIG_LOOKUP_P (result) = koenig_p;
if (cfun)
{
do
{
tree fndecl = OVL_CURRENT (fn);
if (TREE_CODE (fndecl) != FUNCTION_DECL
|| !TREE_THIS_VOLATILE (fndecl))
break;
fn = OVL_NEXT (fn);
}
while (fn);
if (!fn)
current_function_returns_abnormally = 1;
}
return result;
}
orig_args = make_tree_vector_copy (*args);
if (!BASELINK_P (fn)
&& TREE_CODE (fn) != PSEUDO_DTOR_EXPR
&& TREE_TYPE (fn) != unknown_type_node)
fn = build_non_dependent_expr (fn);
make_args_non_dependent (*args);
}
if (TREE_CODE (fn) == COMPONENT_REF)
{
tree member = TREE_OPERAND (fn, 1);
if (BASELINK_P (member))
{
tree object = TREE_OPERAND (fn, 0);
return build_new_method_call (object, member,
args, NULL_TREE,
(disallow_virtual
? LOOKUP_NORMAL | LOOKUP_NONVIRTUAL
: LOOKUP_NORMAL),
/*fn_p=*/NULL,
complain);
}
}
/* Per 13.3.1.1, '(&f)(...)' is the same as '(f)(...)'. */
if (TREE_CODE (fn) == ADDR_EXPR
&& TREE_CODE (TREE_OPERAND (fn, 0)) == OVERLOAD)
fn = TREE_OPERAND (fn, 0);
if (is_overloaded_fn (fn))
fn = baselink_for_fns (fn);
result = NULL_TREE;
if (BASELINK_P (fn))
{
tree object;
/* A call to a member function. From [over.call.func]:
If the keyword this is in scope and refers to the class of
that member function, or a derived class thereof, then the
function call is transformed into a qualified function call
using (*this) as the postfix-expression to the left of the
. operator.... [Otherwise] a contrived object of type T
becomes the implied object argument.
In this situation:
struct A { void f(); };
struct B : public A {};
struct C : public A { void g() { B::f(); }};
"the class of that member function" refers to `A'. But 11.2
[class.access.base] says that we need to convert 'this' to B* as
part of the access, so we pass 'B' to maybe_dummy_object. */
object = maybe_dummy_object (BINFO_TYPE (BASELINK_ACCESS_BINFO (fn)),
NULL);
if (processing_template_decl)
{
if (type_dependent_expression_p (object))
{
tree ret = build_nt_call_vec (orig_fn, orig_args);
release_tree_vector (orig_args);
return ret;
}
object = build_non_dependent_expr (object);
}
result = build_new_method_call (object, fn, args, NULL_TREE,
(disallow_virtual
? LOOKUP_NORMAL|LOOKUP_NONVIRTUAL
: LOOKUP_NORMAL),
/*fn_p=*/NULL,
complain);
}
else if (is_overloaded_fn (fn))
{
/* If the function is an overloaded builtin, resolve it. */
if (TREE_CODE (fn) == FUNCTION_DECL
&& (DECL_BUILT_IN_CLASS (fn) == BUILT_IN_NORMAL
|| DECL_BUILT_IN_CLASS (fn) == BUILT_IN_MD))
result = resolve_overloaded_builtin (input_location, fn, *args);
if (!result)
{
if (warn_sizeof_pointer_memaccess
&& (complain & tf_warning)
&& !vec_safe_is_empty (*args)
&& !processing_template_decl)
{
location_t sizeof_arg_loc[3];
tree sizeof_arg[3];
unsigned int i;
for (i = 0; i < 3; i++)
{
tree t;
sizeof_arg_loc[i] = UNKNOWN_LOCATION;
sizeof_arg[i] = NULL_TREE;
if (i >= (*args)->length ())
continue;
t = (**args)[i];
if (TREE_CODE (t) != SIZEOF_EXPR)
continue;
if (SIZEOF_EXPR_TYPE_P (t))
sizeof_arg[i] = TREE_TYPE (TREE_OPERAND (t, 0));
else
sizeof_arg[i] = TREE_OPERAND (t, 0);
sizeof_arg_loc[i] = EXPR_LOCATION (t);
}
sizeof_pointer_memaccess_warning
(sizeof_arg_loc, fn, *args,
sizeof_arg, same_type_ignoring_top_level_qualifiers_p);
}
/* A call to a namespace-scope function. */
result = build_new_function_call (fn, args, koenig_p, complain);
}
}
else if (TREE_CODE (fn) == PSEUDO_DTOR_EXPR)
{
if (!vec_safe_is_empty (*args))
error ("arguments to destructor are not allowed");
/* Mark the pseudo-destructor call as having side-effects so
that we do not issue warnings about its use. */
result = build1 (NOP_EXPR,
void_type_node,
TREE_OPERAND (fn, 0));
TREE_SIDE_EFFECTS (result) = 1;
}
else if (CLASS_TYPE_P (TREE_TYPE (fn)))
/* If the "function" is really an object of class type, it might
have an overloaded `operator ()'. */
result = build_op_call (fn, args, complain);
if (!result)
/* A call where the function is unknown. */
result = cp_build_function_call_vec (fn, args, complain);
if (processing_template_decl && result != error_mark_node)
{
if (INDIRECT_REF_P (result))
result = TREE_OPERAND (result, 0);
result = build_call_vec (TREE_TYPE (result), orig_fn, orig_args);
SET_EXPR_LOCATION (result, input_location);
KOENIG_LOOKUP_P (result) = koenig_p;
release_tree_vector (orig_args);
result = convert_from_reference (result);
}
if (koenig_p)
{
/* Free garbage OVERLOADs from arg-dependent lookup. */
tree next = NULL_TREE;
for (fn = orig_fn;
fn && TREE_CODE (fn) == OVERLOAD && OVL_ARG_DEPENDENT (fn);
fn = next)
{
if (processing_template_decl)
/* In a template, we'll re-use them at instantiation time. */
OVL_ARG_DEPENDENT (fn) = false;
else
{
next = OVL_CHAIN (fn);
ggc_free (fn);
}
}
}
return result;
}
/* Finish a call to a postfix increment or decrement or EXPR. (Which
is indicated by CODE, which should be POSTINCREMENT_EXPR or
POSTDECREMENT_EXPR.) */
tree
finish_increment_expr (tree expr, enum tree_code code)
{
return build_x_unary_op (input_location, code, expr, tf_warning_or_error);
}
/* Finish a use of `this'. Returns an expression for `this'. */
tree
finish_this_expr (void)
{
tree result = NULL_TREE;
if (current_class_ptr)
{
tree type = TREE_TYPE (current_class_ref);
/* In a lambda expression, 'this' refers to the captured 'this'. */
if (LAMBDA_TYPE_P (type))
result = lambda_expr_this_capture (CLASSTYPE_LAMBDA_EXPR (type), true);
else
result = current_class_ptr;
}
if (result)
/* The keyword 'this' is a prvalue expression. */
return rvalue (result);
tree fn = current_nonlambda_function ();
if (fn && DECL_STATIC_FUNCTION_P (fn))
error ("% is unavailable for static member functions");
else if (fn)
error ("invalid use of % in non-member function");
else
error ("invalid use of % at top level");
return error_mark_node;
}
/* Finish a pseudo-destructor expression. If SCOPE is NULL, the
expression was of the form `OBJECT.~DESTRUCTOR' where DESTRUCTOR is
the TYPE for the type given. If SCOPE is non-NULL, the expression
was of the form `OBJECT.SCOPE::~DESTRUCTOR'. */
tree
finish_pseudo_destructor_expr (tree object, tree scope, tree destructor,
location_t loc)
{
if (object == error_mark_node || destructor == error_mark_node)
return error_mark_node;
gcc_assert (TYPE_P (destructor));
if (!processing_template_decl)
{
if (scope == error_mark_node)
{
error_at (loc, "invalid qualifying scope in pseudo-destructor name");
return error_mark_node;
}
if (is_auto (destructor))
destructor = TREE_TYPE (object);
if (scope && TYPE_P (scope) && !check_dtor_name (scope, destructor))
{
error_at (loc,
"qualified type %qT does not match destructor name ~%qT",
scope, destructor);
return error_mark_node;
}
/* [expr.pseudo] says both:
The type designated by the pseudo-destructor-name shall be
the same as the object type.
and:
The cv-unqualified versions of the object type and of the
type designated by the pseudo-destructor-name shall be the
same type.
We implement the more generous second sentence, since that is
what most other compilers do. */
if (!same_type_ignoring_top_level_qualifiers_p (TREE_TYPE (object),
destructor))
{
error_at (loc, "%qE is not of type %qT", object, destructor);
return error_mark_node;
}
}
return build3_loc (loc, PSEUDO_DTOR_EXPR, void_type_node, object,
scope, destructor);
}
/* Finish an expression of the form CODE EXPR. */
tree
finish_unary_op_expr (location_t loc, enum tree_code code, tree expr,
tsubst_flags_t complain)
{
tree result = build_x_unary_op (loc, code, expr, complain);
if ((complain & tf_warning)
&& TREE_OVERFLOW_P (result) && !TREE_OVERFLOW_P (expr))
overflow_warning (input_location, result);
return result;
}
/* Finish a compound-literal expression. TYPE is the type to which
the CONSTRUCTOR in COMPOUND_LITERAL is being cast. */
tree
finish_compound_literal (tree type, tree compound_literal,
tsubst_flags_t complain)
{
if (type == error_mark_node)
return error_mark_node;
if (TREE_CODE (type) == REFERENCE_TYPE)
{
compound_literal
= finish_compound_literal (TREE_TYPE (type), compound_literal,
complain);
return cp_build_c_cast (type, compound_literal, complain);
}
if (!TYPE_OBJ_P (type))
{
if (complain & tf_error)
error ("compound literal of non-object type %qT", type);
return error_mark_node;
}
if (processing_template_decl)
{
TREE_TYPE (compound_literal) = type;
/* Mark the expression as a compound literal. */
TREE_HAS_CONSTRUCTOR (compound_literal) = 1;
return compound_literal;
}
type = complete_type (type);
if (TYPE_NON_AGGREGATE_CLASS (type))
{
/* Trying to deal with a CONSTRUCTOR instead of a TREE_LIST
everywhere that deals with function arguments would be a pain, so
just wrap it in a TREE_LIST. The parser set a flag so we know
that it came from T{} rather than T({}). */
CONSTRUCTOR_IS_DIRECT_INIT (compound_literal) = 1;
compound_literal = build_tree_list (NULL_TREE, compound_literal);
return build_functional_cast (type, compound_literal, complain);
}
if (TREE_CODE (type) == ARRAY_TYPE
&& check_array_initializer (NULL_TREE, type, compound_literal))
return error_mark_node;
compound_literal = reshape_init (type, compound_literal, complain);
if (SCALAR_TYPE_P (type)
&& !BRACE_ENCLOSED_INITIALIZER_P (compound_literal)
&& !check_narrowing (type, compound_literal, complain))
return error_mark_node;
if (TREE_CODE (type) == ARRAY_TYPE
&& TYPE_DOMAIN (type) == NULL_TREE)
{
cp_complete_array_type_or_error (&type, compound_literal,
false, complain);
if (type == error_mark_node)
return error_mark_node;
}
compound_literal = digest_init (type, compound_literal, complain);
if (TREE_CODE (compound_literal) == CONSTRUCTOR)
TREE_HAS_CONSTRUCTOR (compound_literal) = true;
/* Put static/constant array temporaries in static variables, but always
represent class temporaries with TARGET_EXPR so we elide copies. */
if ((!at_function_scope_p () || CP_TYPE_CONST_P (type))
&& TREE_CODE (type) == ARRAY_TYPE
&& !TYPE_HAS_NONTRIVIAL_DESTRUCTOR (type)
&& initializer_constant_valid_p (compound_literal, type))
{
tree decl = create_temporary_var (type);
DECL_INITIAL (decl) = compound_literal;
TREE_STATIC (decl) = 1;
if (literal_type_p (type) && CP_TYPE_CONST_NON_VOLATILE_P (type))
{
/* 5.19 says that a constant expression can include an
lvalue-rvalue conversion applied to "a glvalue of literal type
that refers to a non-volatile temporary object initialized
with a constant expression". Rather than try to communicate
that this VAR_DECL is a temporary, just mark it constexpr. */
DECL_DECLARED_CONSTEXPR_P (decl) = true;
DECL_INITIALIZED_BY_CONSTANT_EXPRESSION_P (decl) = true;
TREE_CONSTANT (decl) = true;
}
cp_apply_type_quals_to_decl (cp_type_quals (type), decl);
decl = pushdecl_top_level (decl);
DECL_NAME (decl) = make_anon_name ();
SET_DECL_ASSEMBLER_NAME (decl, DECL_NAME (decl));
/* Make sure the destructor is callable. */
tree clean = cxx_maybe_build_cleanup (decl, complain);
if (clean == error_mark_node)
return error_mark_node;
return decl;
}
else
return get_target_expr_sfinae (compound_literal, complain);
}
/* Return the declaration for the function-name variable indicated by
ID. */
tree
finish_fname (tree id)
{
tree decl;
decl = fname_decl (input_location, C_RID_CODE (id), id);
if (processing_template_decl && current_function_decl
&& decl != error_mark_node)
decl = DECL_NAME (decl);
return decl;
}
/* Finish a translation unit. */
void
finish_translation_unit (void)
{
/* In case there were missing closebraces,
get us back to the global binding level. */
pop_everything ();
while (current_namespace != global_namespace)
pop_namespace ();
/* Do file scope __FUNCTION__ et al. */
finish_fname_decls ();
}
/* Finish a template type parameter, specified as AGGR IDENTIFIER.
Returns the parameter. */
tree
finish_template_type_parm (tree aggr, tree identifier)
{
if (aggr != class_type_node)
{
permerror (input_location, "template type parameters must use the keyword % or %");
aggr = class_type_node;
}
return build_tree_list (aggr, identifier);
}
/* Finish a template template parameter, specified as AGGR IDENTIFIER.
Returns the parameter. */
tree
finish_template_template_parm (tree aggr, tree identifier)
{
tree decl = build_decl (input_location,
TYPE_DECL, identifier, NULL_TREE);
tree tmpl = build_lang_decl (TEMPLATE_DECL, identifier, NULL_TREE);
DECL_TEMPLATE_PARMS (tmpl) = current_template_parms;
DECL_TEMPLATE_RESULT (tmpl) = decl;
DECL_ARTIFICIAL (decl) = 1;
// Associate the constraints with the underlying declaration,
// not the template.
tree reqs = TEMPLATE_PARMS_CONSTRAINTS (current_template_parms);
tree constr = build_constraints (reqs, NULL_TREE);
set_constraints (decl, constr);
end_template_decl ();
gcc_assert (DECL_TEMPLATE_PARMS (tmpl));
check_default_tmpl_args (decl, DECL_TEMPLATE_PARMS (tmpl),
/*is_primary=*/true, /*is_partial=*/false,
/*is_friend=*/0);
return finish_template_type_parm (aggr, tmpl);
}
/* ARGUMENT is the default-argument value for a template template
parameter. If ARGUMENT is invalid, issue error messages and return
the ERROR_MARK_NODE. Otherwise, ARGUMENT itself is returned. */
tree
check_template_template_default_arg (tree argument)
{
if (TREE_CODE (argument) != TEMPLATE_DECL
&& TREE_CODE (argument) != TEMPLATE_TEMPLATE_PARM
&& TREE_CODE (argument) != UNBOUND_CLASS_TEMPLATE)
{
if (TREE_CODE (argument) == TYPE_DECL)
error ("invalid use of type %qT as a default value for a template "
"template-parameter", TREE_TYPE (argument));
else
error ("invalid default argument for a template template parameter");
return error_mark_node;
}
return argument;
}
/* Begin a class definition, as indicated by T. */
tree
begin_class_definition (tree t)
{
if (error_operand_p (t) || error_operand_p (TYPE_MAIN_DECL (t)))
return error_mark_node;
if (processing_template_parmlist)
{
error ("definition of %q#T inside template parameter list", t);
return error_mark_node;
}
/* According to the C++ ABI, decimal classes defined in ISO/IEC TR 24733
are passed the same as decimal scalar types. */
if (TREE_CODE (t) == RECORD_TYPE
&& !processing_template_decl)
{
tree ns = TYPE_CONTEXT (t);
if (ns && TREE_CODE (ns) == NAMESPACE_DECL
&& DECL_CONTEXT (ns) == std_node
&& DECL_NAME (ns)
&& !strcmp (IDENTIFIER_POINTER (DECL_NAME (ns)), "decimal"))
{
const char *n = TYPE_NAME_STRING (t);
if ((strcmp (n, "decimal32") == 0)
|| (strcmp (n, "decimal64") == 0)
|| (strcmp (n, "decimal128") == 0))
TYPE_TRANSPARENT_AGGR (t) = 1;
}
}
/* A non-implicit typename comes from code like:
template struct A {
template struct A::B ...
This is erroneous. */
else if (TREE_CODE (t) == TYPENAME_TYPE)
{
error ("invalid definition of qualified type %qT", t);
t = error_mark_node;
}
if (t == error_mark_node || ! MAYBE_CLASS_TYPE_P (t))
{
t = make_class_type (RECORD_TYPE);
pushtag (make_anon_name (), t, /*tag_scope=*/ts_current);
}
if (TYPE_BEING_DEFINED (t))
{
t = make_class_type (TREE_CODE (t));
pushtag (TYPE_IDENTIFIER (t), t, /*tag_scope=*/ts_current);
}
maybe_process_partial_specialization (t);
pushclass (t);
TYPE_BEING_DEFINED (t) = 1;
class_binding_level->defining_class_p = 1;
if (flag_pack_struct)
{
tree v;
TYPE_PACKED (t) = 1;
/* Even though the type is being defined for the first time
here, there might have been a forward declaration, so there
might be cv-qualified variants of T. */
for (v = TYPE_NEXT_VARIANT (t); v; v = TYPE_NEXT_VARIANT (v))
TYPE_PACKED (v) = 1;
}
/* Reset the interface data, at the earliest possible
moment, as it might have been set via a class foo;
before. */
if (! TYPE_ANONYMOUS_P (t))
{
struct c_fileinfo *finfo = \
get_fileinfo (LOCATION_FILE (input_location));
CLASSTYPE_INTERFACE_ONLY (t) = finfo->interface_only;
SET_CLASSTYPE_INTERFACE_UNKNOWN_X
(t, finfo->interface_unknown);
}
reset_specialization();
/* Make a declaration for this class in its own scope. */
build_self_reference ();
return t;
}
/* Finish the member declaration given by DECL. */
void
finish_member_declaration (tree decl)
{
if (decl == error_mark_node || decl == NULL_TREE)
return;
if (decl == void_type_node)
/* The COMPONENT was a friend, not a member, and so there's
nothing for us to do. */
return;
/* We should see only one DECL at a time. */
gcc_assert (DECL_CHAIN (decl) == NULL_TREE);
/* Set up access control for DECL. */
TREE_PRIVATE (decl)
= (current_access_specifier == access_private_node);
TREE_PROTECTED (decl)
= (current_access_specifier == access_protected_node);
if (TREE_CODE (decl) == TEMPLATE_DECL)
{
TREE_PRIVATE (DECL_TEMPLATE_RESULT (decl)) = TREE_PRIVATE (decl);
TREE_PROTECTED (DECL_TEMPLATE_RESULT (decl)) = TREE_PROTECTED (decl);
}
/* Mark the DECL as a member of the current class, unless it's
a member of an enumeration. */
if (TREE_CODE (decl) != CONST_DECL)
DECL_CONTEXT (decl) = current_class_type;
/* Check for bare parameter packs in the member variable declaration. */
if (TREE_CODE (decl) == FIELD_DECL)
{
if (check_for_bare_parameter_packs (TREE_TYPE (decl)))
TREE_TYPE (decl) = error_mark_node;
if (check_for_bare_parameter_packs (DECL_ATTRIBUTES (decl)))
DECL_ATTRIBUTES (decl) = NULL_TREE;
}
/* [dcl.link]
A C language linkage is ignored for the names of class members
and the member function type of class member functions. */
if (DECL_LANG_SPECIFIC (decl) && DECL_LANGUAGE (decl) == lang_c)
SET_DECL_LANGUAGE (decl, lang_cplusplus);
/* Put functions on the TYPE_METHODS list and everything else on the
TYPE_FIELDS list. Note that these are built up in reverse order.
We reverse them (to obtain declaration order) in finish_struct. */
if (DECL_DECLARES_FUNCTION_P (decl))
{
/* We also need to add this function to the
CLASSTYPE_METHOD_VEC. */
if (add_method (current_class_type, decl, NULL_TREE))
{
gcc_assert (TYPE_MAIN_VARIANT (current_class_type) == current_class_type);
DECL_CHAIN (decl) = TYPE_METHODS (current_class_type);
TYPE_METHODS (current_class_type) = decl;
maybe_add_class_template_decl_list (current_class_type, decl,
/*friend_p=*/0);
}
}
/* Enter the DECL into the scope of the class, if the class
isn't a closure (whose fields are supposed to be unnamed). */
else if (CLASSTYPE_LAMBDA_EXPR (current_class_type)
|| pushdecl_class_level (decl))
{
if (TREE_CODE (decl) == USING_DECL)
{
/* For now, ignore class-scope USING_DECLS, so that
debugging backends do not see them. */
DECL_IGNORED_P (decl) = 1;
}
/* All TYPE_DECLs go at the end of TYPE_FIELDS. Ordinary fields
go at the beginning. The reason is that lookup_field_1
searches the list in order, and we want a field name to
override a type name so that the "struct stat hack" will
work. In particular:
struct S { enum E { }; int E } s;
s.E = 3;
is valid. In addition, the FIELD_DECLs must be maintained in
declaration order so that class layout works as expected.
However, we don't need that order until class layout, so we
save a little time by putting FIELD_DECLs on in reverse order
here, and then reversing them in finish_struct_1. (We could
also keep a pointer to the correct insertion points in the
list.) */
if (TREE_CODE (decl) == TYPE_DECL)
TYPE_FIELDS (current_class_type)
= chainon (TYPE_FIELDS (current_class_type), decl);
else
{
DECL_CHAIN (decl) = TYPE_FIELDS (current_class_type);
TYPE_FIELDS (current_class_type) = decl;
}
maybe_add_class_template_decl_list (current_class_type, decl,
/*friend_p=*/0);
}
}
/* Finish processing a complete template declaration. The PARMS are
the template parameters. */
void
finish_template_decl (tree parms)
{
if (parms)
end_template_decl ();
else
end_specialization ();
}
// Returns the template type of the class scope being entered. If we're
// entering a constrained class scope. TYPE is the class template
// scope being entered and we may need to match the intended type with
// a constrained specialization. For example:
//
// template