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cp-gimplify.c
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cp-gimplify.c
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/* C++-specific tree lowering bits; see also c-gimplify.c and tree-gimple.c.
Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011
Free Software Foundation, Inc.
Contributed by Jason Merrill <jason@redhat.com>
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 "tm.h"
#include "tree.h"
#include "cp-tree.h"
#include "c-family/c-common.h"
#include "tree-iterator.h"
#include "gimple.h"
#include "hashtab.h"
#include "pointer-set.h"
#include "flags.h"
#include "splay-tree.h"
/* Forward declarations. */
static tree cp_genericize_r (tree *, int *, void *);
static void cp_genericize_tree (tree*);
/* Local declarations. */
enum bc_t { bc_break = 0, bc_continue = 1 };
/* Stack of labels which are targets for "break" or "continue",
linked through TREE_CHAIN. */
static tree bc_label[2];
/* Begin a scope which can be exited by a break or continue statement. BC
indicates which.
Just creates a label with location LOCATION and pushes it into the current
context. */
static tree
begin_bc_block (enum bc_t bc, location_t location)
{
tree label = create_artificial_label (location);
DECL_CHAIN (label) = bc_label[bc];
bc_label[bc] = label;
return label;
}
/* Finish a scope which can be exited by a break or continue statement.
LABEL was returned from the most recent call to begin_bc_block. BLOCK is
an expression for the contents of the scope.
If we saw a break (or continue) in the scope, append a LABEL_EXPR to
BLOCK. Otherwise, just forget the label. */
static void
finish_bc_block (tree *block, enum bc_t bc, tree label)
{
gcc_assert (label == bc_label[bc]);
if (TREE_USED (label))
append_to_statement_list (build1 (LABEL_EXPR, void_type_node, label),
block);
bc_label[bc] = DECL_CHAIN (label);
DECL_CHAIN (label) = NULL_TREE;
}
/* Get the LABEL_EXPR to represent a break or continue statement
in the current block scope. BC indicates which. */
static tree
get_bc_label (enum bc_t bc)
{
tree label = bc_label[bc];
/* Mark the label used for finish_bc_block. */
TREE_USED (label) = 1;
return label;
}
/* Genericize a TRY_BLOCK. */
static void
genericize_try_block (tree *stmt_p)
{
tree body = TRY_STMTS (*stmt_p);
tree cleanup = TRY_HANDLERS (*stmt_p);
*stmt_p = build2 (TRY_CATCH_EXPR, void_type_node, body, cleanup);
}
/* Genericize a HANDLER by converting to a CATCH_EXPR. */
static void
genericize_catch_block (tree *stmt_p)
{
tree type = HANDLER_TYPE (*stmt_p);
tree body = HANDLER_BODY (*stmt_p);
/* FIXME should the caught type go in TREE_TYPE? */
*stmt_p = build2 (CATCH_EXPR, void_type_node, type, body);
}
/* A terser interface for building a representation of an exception
specification. */
static tree
build_gimple_eh_filter_tree (tree body, tree allowed, tree failure)
{
tree t;
/* FIXME should the allowed types go in TREE_TYPE? */
t = build2 (EH_FILTER_EXPR, void_type_node, allowed, NULL_TREE);
append_to_statement_list (failure, &EH_FILTER_FAILURE (t));
t = build2 (TRY_CATCH_EXPR, void_type_node, NULL_TREE, t);
append_to_statement_list (body, &TREE_OPERAND (t, 0));
return t;
}
/* Genericize an EH_SPEC_BLOCK by converting it to a
TRY_CATCH_EXPR/EH_FILTER_EXPR pair. */
static void
genericize_eh_spec_block (tree *stmt_p)
{
tree body = EH_SPEC_STMTS (*stmt_p);
tree allowed = EH_SPEC_RAISES (*stmt_p);
tree failure = build_call_n (call_unexpected_node, 1, build_exc_ptr ());
*stmt_p = build_gimple_eh_filter_tree (body, allowed, failure);
TREE_NO_WARNING (*stmt_p) = true;
TREE_NO_WARNING (TREE_OPERAND (*stmt_p, 1)) = true;
}
/* Genericize an IF_STMT by turning it into a COND_EXPR. */
static void
genericize_if_stmt (tree *stmt_p)
{
tree stmt, cond, then_, else_;
location_t locus = EXPR_LOCATION (*stmt_p);
stmt = *stmt_p;
cond = IF_COND (stmt);
then_ = THEN_CLAUSE (stmt);
else_ = ELSE_CLAUSE (stmt);
if (!then_)
then_ = build_empty_stmt (locus);
if (!else_)
else_ = build_empty_stmt (locus);
if (integer_nonzerop (cond) && !TREE_SIDE_EFFECTS (else_))
stmt = then_;
else if (integer_zerop (cond) && !TREE_SIDE_EFFECTS (then_))
stmt = else_;
else
stmt = build3 (COND_EXPR, void_type_node, cond, then_, else_);
if (CAN_HAVE_LOCATION_P (stmt) && !EXPR_HAS_LOCATION (stmt))
SET_EXPR_LOCATION (stmt, locus);
*stmt_p = stmt;
}
/* Build a generic representation of one of the C loop forms. COND is the
loop condition or NULL_TREE. BODY is the (possibly compound) statement
controlled by the loop. INCR is the increment expression of a for-loop,
or NULL_TREE. COND_IS_FIRST indicates whether the condition is
evaluated before the loop body as in while and for loops, or after the
loop body as in do-while loops. */
static void
genericize_cp_loop (tree *stmt_p, location_t start_locus, tree cond, tree body,
tree incr, bool cond_is_first, int *walk_subtrees,
void *data)
{
tree blab, clab;
tree entry = NULL, exit = NULL, t;
tree stmt_list = NULL;
blab = begin_bc_block (bc_break, start_locus);
clab = begin_bc_block (bc_continue, start_locus);
if (incr && EXPR_P (incr))
SET_EXPR_LOCATION (incr, start_locus);
cp_walk_tree (&cond, cp_genericize_r, data, NULL);
cp_walk_tree (&body, cp_genericize_r, data, NULL);
cp_walk_tree (&incr, cp_genericize_r, data, NULL);
*walk_subtrees = 0;
/* If condition is zero don't generate a loop construct. */
if (cond && integer_zerop (cond))
{
if (cond_is_first)
{
t = build1_loc (start_locus, GOTO_EXPR, void_type_node,
get_bc_label (bc_break));
append_to_statement_list (t, &stmt_list);
}
}
else
{
/* Expand to gotos, just like c_finish_loop. TODO: Use LOOP_EXPR. */
tree top = build1 (LABEL_EXPR, void_type_node,
create_artificial_label (start_locus));
/* If we have an exit condition, then we build an IF with gotos either
out of the loop, or to the top of it. If there's no exit condition,
then we just build a jump back to the top. */
exit = build1 (GOTO_EXPR, void_type_node, LABEL_EXPR_LABEL (top));
if (cond && !integer_nonzerop (cond))
{
/* Canonicalize the loop condition to the end. This means
generating a branch to the loop condition. Reuse the
continue label, if possible. */
if (cond_is_first)
{
if (incr)
{
entry = build1 (LABEL_EXPR, void_type_node,
create_artificial_label (start_locus));
t = build1_loc (start_locus, GOTO_EXPR, void_type_node,
LABEL_EXPR_LABEL (entry));
}
else
t = build1_loc (start_locus, GOTO_EXPR, void_type_node,
get_bc_label (bc_continue));
append_to_statement_list (t, &stmt_list);
}
t = build1 (GOTO_EXPR, void_type_node, get_bc_label (bc_break));
exit = fold_build3_loc (start_locus,
COND_EXPR, void_type_node, cond, exit, t);
}
append_to_statement_list (top, &stmt_list);
}
append_to_statement_list (body, &stmt_list);
finish_bc_block (&stmt_list, bc_continue, clab);
append_to_statement_list (incr, &stmt_list);
append_to_statement_list (entry, &stmt_list);
append_to_statement_list (exit, &stmt_list);
finish_bc_block (&stmt_list, bc_break, blab);
if (stmt_list == NULL_TREE)
stmt_list = build1 (NOP_EXPR, void_type_node, integer_zero_node);
*stmt_p = stmt_list;
}
/* Genericize a FOR_STMT node *STMT_P. */
static void
genericize_for_stmt (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
tree expr = NULL;
tree loop;
tree init = FOR_INIT_STMT (stmt);
if (init)
{
cp_walk_tree (&init, cp_genericize_r, data, NULL);
append_to_statement_list (init, &expr);
}
genericize_cp_loop (&loop, EXPR_LOCATION (stmt), FOR_COND (stmt),
FOR_BODY (stmt), FOR_EXPR (stmt), 1, walk_subtrees, data);
append_to_statement_list (loop, &expr);
*stmt_p = expr;
}
/* Genericize a WHILE_STMT node *STMT_P. */
static void
genericize_while_stmt (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
genericize_cp_loop (stmt_p, EXPR_LOCATION (stmt), WHILE_COND (stmt),
WHILE_BODY (stmt), NULL_TREE, 1, walk_subtrees, data);
}
/* Genericize a DO_STMT node *STMT_P. */
static void
genericize_do_stmt (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
genericize_cp_loop (stmt_p, EXPR_LOCATION (stmt), DO_COND (stmt),
DO_BODY (stmt), NULL_TREE, 0, walk_subtrees, data);
}
/* Genericize a SWITCH_STMT node *STMT_P by turning it into a SWITCH_EXPR. */
static void
genericize_switch_stmt (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
tree break_block, body, cond, type;
location_t stmt_locus = EXPR_LOCATION (stmt);
break_block = begin_bc_block (bc_break, stmt_locus);
body = SWITCH_STMT_BODY (stmt);
if (!body)
body = build_empty_stmt (stmt_locus);
cond = SWITCH_STMT_COND (stmt);
type = SWITCH_STMT_TYPE (stmt);
cp_walk_tree (&body, cp_genericize_r, data, NULL);
cp_walk_tree (&cond, cp_genericize_r, data, NULL);
cp_walk_tree (&type, cp_genericize_r, data, NULL);
*walk_subtrees = 0;
*stmt_p = build3_loc (stmt_locus, SWITCH_EXPR, type, cond, body, NULL_TREE);
finish_bc_block (stmt_p, bc_break, break_block);
}
/* Genericize a CONTINUE_STMT node *STMT_P. */
static void
genericize_continue_stmt (tree *stmt_p)
{
tree stmt_list = NULL;
tree pred = build_predict_expr (PRED_CONTINUE, NOT_TAKEN);
tree label = get_bc_label (bc_continue);
location_t location = EXPR_LOCATION (*stmt_p);
tree jump = build1_loc (location, GOTO_EXPR, void_type_node, label);
append_to_statement_list (pred, &stmt_list);
append_to_statement_list (jump, &stmt_list);
*stmt_p = stmt_list;
}
/* Genericize a BREAK_STMT node *STMT_P. */
static void
genericize_break_stmt (tree *stmt_p)
{
tree label = get_bc_label (bc_break);
location_t location = EXPR_LOCATION (*stmt_p);
*stmt_p = build1_loc (location, GOTO_EXPR, void_type_node, label);
}
/* Genericize a OMP_FOR node *STMT_P. */
static void
genericize_omp_for_stmt (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
location_t locus = EXPR_LOCATION (stmt);
tree clab = begin_bc_block (bc_continue, locus);
cp_walk_tree (&OMP_FOR_BODY (stmt), cp_genericize_r, data, NULL);
cp_walk_tree (&OMP_FOR_CLAUSES (stmt), cp_genericize_r, data, NULL);
cp_walk_tree (&OMP_FOR_INIT (stmt), cp_genericize_r, data, NULL);
cp_walk_tree (&OMP_FOR_COND (stmt), cp_genericize_r, data, NULL);
cp_walk_tree (&OMP_FOR_INCR (stmt), cp_genericize_r, data, NULL);
cp_walk_tree (&OMP_FOR_PRE_BODY (stmt), cp_genericize_r, data, NULL);
*walk_subtrees = 0;
finish_bc_block (&OMP_FOR_BODY (stmt), bc_continue, clab);
}
/* Hook into the middle of gimplifying an OMP_FOR node. */
static enum gimplify_status
cp_gimplify_omp_for (tree *expr_p, gimple_seq *pre_p)
{
tree for_stmt = *expr_p;
gimple_seq seq = NULL;
/* Protect ourselves from recursion. */
if (OMP_FOR_GIMPLIFYING_P (for_stmt))
return GS_UNHANDLED;
OMP_FOR_GIMPLIFYING_P (for_stmt) = 1;
gimplify_and_add (for_stmt, &seq);
gimple_seq_add_seq (pre_p, seq);
OMP_FOR_GIMPLIFYING_P (for_stmt) = 0;
return GS_ALL_DONE;
}
/* Gimplify an EXPR_STMT node. */
static void
gimplify_expr_stmt (tree *stmt_p)
{
tree stmt = EXPR_STMT_EXPR (*stmt_p);
if (stmt == error_mark_node)
stmt = NULL;
/* Gimplification of a statement expression will nullify the
statement if all its side effects are moved to *PRE_P and *POST_P.
In this case we will not want to emit the gimplified statement.
However, we may still want to emit a warning, so we do that before
gimplification. */
if (stmt && warn_unused_value)
{
if (!TREE_SIDE_EFFECTS (stmt))
{
if (!IS_EMPTY_STMT (stmt)
&& !VOID_TYPE_P (TREE_TYPE (stmt))
&& !TREE_NO_WARNING (stmt))
warning (OPT_Wunused_value, "statement with no effect");
}
else
warn_if_unused_value (stmt, input_location);
}
if (stmt == NULL_TREE)
stmt = alloc_stmt_list ();
*stmt_p = stmt;
}
/* Gimplify initialization from an AGGR_INIT_EXPR. */
static void
cp_gimplify_init_expr (tree *expr_p)
{
tree from = TREE_OPERAND (*expr_p, 1);
tree to = TREE_OPERAND (*expr_p, 0);
tree t;
/* What about code that pulls out the temp and uses it elsewhere? I
think that such code never uses the TARGET_EXPR as an initializer. If
I'm wrong, we'll abort because the temp won't have any RTL. In that
case, I guess we'll need to replace references somehow. */
if (TREE_CODE (from) == TARGET_EXPR)
from = TARGET_EXPR_INITIAL (from);
/* Look through any COMPOUND_EXPRs, since build_compound_expr pushes them
inside the TARGET_EXPR. */
for (t = from; t; )
{
tree sub = TREE_CODE (t) == COMPOUND_EXPR ? TREE_OPERAND (t, 0) : t;
/* If we are initializing from an AGGR_INIT_EXPR, drop the INIT_EXPR and
replace the slot operand with our target.
Should we add a target parm to gimplify_expr instead? No, as in this
case we want to replace the INIT_EXPR. */
if (TREE_CODE (sub) == AGGR_INIT_EXPR
|| TREE_CODE (sub) == VEC_INIT_EXPR)
{
if (TREE_CODE (sub) == AGGR_INIT_EXPR)
AGGR_INIT_EXPR_SLOT (sub) = to;
else
VEC_INIT_EXPR_SLOT (sub) = to;
*expr_p = from;
/* The initialization is now a side-effect, so the container can
become void. */
if (from != sub)
TREE_TYPE (from) = void_type_node;
}
if (t == sub)
break;
else
t = TREE_OPERAND (t, 1);
}
}
/* Gimplify a MUST_NOT_THROW_EXPR. */
static enum gimplify_status
gimplify_must_not_throw_expr (tree *expr_p, gimple_seq *pre_p)
{
tree stmt = *expr_p;
tree temp = voidify_wrapper_expr (stmt, NULL);
tree body = TREE_OPERAND (stmt, 0);
gimple_seq try_ = NULL;
gimple_seq catch_ = NULL;
gimple mnt;
gimplify_and_add (body, &try_);
mnt = gimple_build_eh_must_not_throw (terminate_node);
gimple_seq_add_stmt_without_update (&catch_, mnt);
mnt = gimple_build_try (try_, catch_, GIMPLE_TRY_CATCH);
gimple_seq_add_stmt_without_update (pre_p, mnt);
if (temp)
{
*expr_p = temp;
return GS_OK;
}
*expr_p = NULL;
return GS_ALL_DONE;
}
/* Do C++-specific gimplification. Args are as for gimplify_expr. */
int
cp_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
{
int saved_stmts_are_full_exprs_p = 0;
enum tree_code code = TREE_CODE (*expr_p);
enum gimplify_status ret;
if (STATEMENT_CODE_P (code))
{
saved_stmts_are_full_exprs_p = stmts_are_full_exprs_p ();
current_stmt_tree ()->stmts_are_full_exprs_p
= STMT_IS_FULL_EXPR_P (*expr_p);
}
switch (code)
{
case PTRMEM_CST:
*expr_p = cplus_expand_constant (*expr_p);
ret = GS_OK;
break;
case AGGR_INIT_EXPR:
simplify_aggr_init_expr (expr_p);
ret = GS_OK;
break;
case VEC_INIT_EXPR:
{
location_t loc = input_location;
tree init = VEC_INIT_EXPR_INIT (*expr_p);
int from_array = (init && TREE_CODE (TREE_TYPE (init)) == ARRAY_TYPE);
gcc_assert (EXPR_HAS_LOCATION (*expr_p));
input_location = EXPR_LOCATION (*expr_p);
*expr_p = build_vec_init (VEC_INIT_EXPR_SLOT (*expr_p), NULL_TREE,
init, VEC_INIT_EXPR_VALUE_INIT (*expr_p),
from_array,
tf_warning_or_error);
cp_genericize_tree (expr_p);
ret = GS_OK;
input_location = loc;
}
break;
case THROW_EXPR:
/* FIXME communicate throw type to back end, probably by moving
THROW_EXPR into ../tree.def. */
*expr_p = TREE_OPERAND (*expr_p, 0);
ret = GS_OK;
break;
case MUST_NOT_THROW_EXPR:
ret = gimplify_must_not_throw_expr (expr_p, pre_p);
break;
/* We used to do this for MODIFY_EXPR as well, but that's unsafe; the
LHS of an assignment might also be involved in the RHS, as in bug
25979. */
case INIT_EXPR:
cp_gimplify_init_expr (expr_p);
if (TREE_CODE (*expr_p) != INIT_EXPR)
return GS_OK;
/* Otherwise fall through. */
case MODIFY_EXPR:
{
/* If the back end isn't clever enough to know that the lhs and rhs
types are the same, add an explicit conversion. */
tree op0 = TREE_OPERAND (*expr_p, 0);
tree op1 = TREE_OPERAND (*expr_p, 1);
if (!error_operand_p (op0)
&& !error_operand_p (op1)
&& (TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (op0))
|| TYPE_STRUCTURAL_EQUALITY_P (TREE_TYPE (op1)))
&& !useless_type_conversion_p (TREE_TYPE (op1), TREE_TYPE (op0)))
TREE_OPERAND (*expr_p, 1) = build1 (VIEW_CONVERT_EXPR,
TREE_TYPE (op0), op1);
else if ((is_gimple_lvalue (op1) || INDIRECT_REF_P (op1)
|| (TREE_CODE (op1) == CONSTRUCTOR
&& CONSTRUCTOR_NELTS (op1) == 0
&& !TREE_CLOBBER_P (op1))
|| (TREE_CODE (op1) == CALL_EXPR
&& !CALL_EXPR_RETURN_SLOT_OPT (op1)))
&& is_really_empty_class (TREE_TYPE (op0)))
{
/* Remove any copies of empty classes. We check that the RHS
has a simple form so that TARGET_EXPRs and non-empty
CONSTRUCTORs get reduced properly, and we leave the return
slot optimization alone because it isn't a copy (FIXME so it
shouldn't be represented as one).
Also drop volatile variables on the RHS to avoid infinite
recursion from gimplify_expr trying to load the value. */
if (!TREE_SIDE_EFFECTS (op1)
|| (DECL_P (op1) && TREE_THIS_VOLATILE (op1)))
*expr_p = op0;
else if (TREE_CODE (op1) == MEM_REF
&& TREE_THIS_VOLATILE (op1))
{
/* Similarly for volatile MEM_REFs on the RHS. */
if (!TREE_SIDE_EFFECTS (TREE_OPERAND (op1, 0)))
*expr_p = op0;
else
*expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p),
TREE_OPERAND (op1, 0), op0);
}
else
*expr_p = build2 (COMPOUND_EXPR, TREE_TYPE (*expr_p),
op0, op1);
}
}
ret = GS_OK;
break;
case EMPTY_CLASS_EXPR:
/* We create an empty CONSTRUCTOR with RECORD_TYPE. */
*expr_p = build_constructor (TREE_TYPE (*expr_p), NULL);
ret = GS_OK;
break;
case BASELINK:
*expr_p = BASELINK_FUNCTIONS (*expr_p);
ret = GS_OK;
break;
case TRY_BLOCK:
genericize_try_block (expr_p);
ret = GS_OK;
break;
case HANDLER:
genericize_catch_block (expr_p);
ret = GS_OK;
break;
case EH_SPEC_BLOCK:
genericize_eh_spec_block (expr_p);
ret = GS_OK;
break;
case USING_STMT:
gcc_unreachable ();
case FOR_STMT:
case WHILE_STMT:
case DO_STMT:
case SWITCH_STMT:
case CONTINUE_STMT:
case BREAK_STMT:
gcc_unreachable ();
case OMP_FOR:
ret = cp_gimplify_omp_for (expr_p, pre_p);
break;
case EXPR_STMT:
gimplify_expr_stmt (expr_p);
ret = GS_OK;
break;
case UNARY_PLUS_EXPR:
{
tree arg = TREE_OPERAND (*expr_p, 0);
tree type = TREE_TYPE (*expr_p);
*expr_p = (TREE_TYPE (arg) != type) ? fold_convert (type, arg)
: arg;
ret = GS_OK;
}
break;
default:
ret = (enum gimplify_status) c_gimplify_expr (expr_p, pre_p, post_p);
break;
}
/* Restore saved state. */
if (STATEMENT_CODE_P (code))
current_stmt_tree ()->stmts_are_full_exprs_p
= saved_stmts_are_full_exprs_p;
return ret;
}
static inline bool
is_invisiref_parm (const_tree t)
{
return ((TREE_CODE (t) == PARM_DECL || TREE_CODE (t) == RESULT_DECL)
&& DECL_BY_REFERENCE (t));
}
/* Return true if the uid in both int tree maps are equal. */
int
cxx_int_tree_map_eq (const void *va, const void *vb)
{
const struct cxx_int_tree_map *a = (const struct cxx_int_tree_map *) va;
const struct cxx_int_tree_map *b = (const struct cxx_int_tree_map *) vb;
return (a->uid == b->uid);
}
/* Hash a UID in a cxx_int_tree_map. */
unsigned int
cxx_int_tree_map_hash (const void *item)
{
return ((const struct cxx_int_tree_map *)item)->uid;
}
/* A stable comparison routine for use with splay trees and DECLs. */
static int
splay_tree_compare_decl_uid (splay_tree_key xa, splay_tree_key xb)
{
tree a = (tree) xa;
tree b = (tree) xb;
return DECL_UID (a) - DECL_UID (b);
}
/* OpenMP context during genericization. */
struct cp_genericize_omp_taskreg
{
bool is_parallel;
bool default_shared;
struct cp_genericize_omp_taskreg *outer;
splay_tree variables;
};
/* Return true if genericization should try to determine if
DECL is firstprivate or shared within task regions. */
static bool
omp_var_to_track (tree decl)
{
tree type = TREE_TYPE (decl);
if (is_invisiref_parm (decl))
type = TREE_TYPE (type);
while (TREE_CODE (type) == ARRAY_TYPE)
type = TREE_TYPE (type);
if (type == error_mark_node || !CLASS_TYPE_P (type))
return false;
if (TREE_CODE (decl) == VAR_DECL && DECL_THREAD_LOCAL_P (decl))
return false;
if (cxx_omp_predetermined_sharing (decl) != OMP_CLAUSE_DEFAULT_UNSPECIFIED)
return false;
return true;
}
/* Note DECL use in OpenMP region OMP_CTX during genericization. */
static void
omp_cxx_notice_variable (struct cp_genericize_omp_taskreg *omp_ctx, tree decl)
{
splay_tree_node n = splay_tree_lookup (omp_ctx->variables,
(splay_tree_key) decl);
if (n == NULL)
{
int flags = OMP_CLAUSE_DEFAULT_SHARED;
if (omp_ctx->outer)
omp_cxx_notice_variable (omp_ctx->outer, decl);
if (!omp_ctx->default_shared)
{
struct cp_genericize_omp_taskreg *octx;
for (octx = omp_ctx->outer; octx; octx = octx->outer)
{
n = splay_tree_lookup (octx->variables, (splay_tree_key) decl);
if (n && n->value != OMP_CLAUSE_DEFAULT_SHARED)
{
flags = OMP_CLAUSE_DEFAULT_FIRSTPRIVATE;
break;
}
if (octx->is_parallel)
break;
}
if (octx == NULL
&& (TREE_CODE (decl) == PARM_DECL
|| (!(TREE_STATIC (decl) || DECL_EXTERNAL (decl))
&& DECL_CONTEXT (decl) == current_function_decl)))
flags = OMP_CLAUSE_DEFAULT_FIRSTPRIVATE;
if (flags == OMP_CLAUSE_DEFAULT_FIRSTPRIVATE)
{
/* DECL is implicitly determined firstprivate in
the current task construct. Ensure copy ctor and
dtor are instantiated, because during gimplification
it will be already too late. */
tree type = TREE_TYPE (decl);
if (is_invisiref_parm (decl))
type = TREE_TYPE (type);
while (TREE_CODE (type) == ARRAY_TYPE)
type = TREE_TYPE (type);
get_copy_ctor (type, tf_none);
get_dtor (type, tf_none);
}
}
splay_tree_insert (omp_ctx->variables, (splay_tree_key) decl, flags);
}
}
/* Genericization context. */
struct cp_genericize_data
{
struct pointer_set_t *p_set;
VEC (tree, heap) *bind_expr_stack;
struct cp_genericize_omp_taskreg *omp_ctx;
};
/* Perform any pre-gimplification lowering of C++ front end trees to
GENERIC. */
static tree
cp_genericize_r (tree *stmt_p, int *walk_subtrees, void *data)
{
tree stmt = *stmt_p;
struct cp_genericize_data *wtd = (struct cp_genericize_data *) data;
struct pointer_set_t *p_set = wtd->p_set;
/* If in an OpenMP context, note var uses. */
if (__builtin_expect (wtd->omp_ctx != NULL, 0)
&& (TREE_CODE (stmt) == VAR_DECL
|| TREE_CODE (stmt) == PARM_DECL
|| TREE_CODE (stmt) == RESULT_DECL)
&& omp_var_to_track (stmt))
omp_cxx_notice_variable (wtd->omp_ctx, stmt);
if (is_invisiref_parm (stmt)
/* Don't dereference parms in a thunk, pass the references through. */
&& !(DECL_THUNK_P (current_function_decl)
&& TREE_CODE (stmt) == PARM_DECL))
{
*stmt_p = convert_from_reference (stmt);
*walk_subtrees = 0;
return NULL;
}
/* Map block scope extern declarations to visible declarations with the
same name and type in outer scopes if any. */
if (cp_function_chain->extern_decl_map
&& (TREE_CODE (stmt) == FUNCTION_DECL || TREE_CODE (stmt) == VAR_DECL)
&& DECL_EXTERNAL (stmt))
{
struct cxx_int_tree_map *h, in;
in.uid = DECL_UID (stmt);
h = (struct cxx_int_tree_map *)
htab_find_with_hash (cp_function_chain->extern_decl_map,
&in, in.uid);
if (h)
{
*stmt_p = h->to;
*walk_subtrees = 0;
return NULL;
}
}
/* Other than invisiref parms, don't walk the same tree twice. */
if (pointer_set_contains (p_set, stmt))
{
*walk_subtrees = 0;
return NULL_TREE;
}
if (TREE_CODE (stmt) == ADDR_EXPR
&& is_invisiref_parm (TREE_OPERAND (stmt, 0)))
{
/* If in an OpenMP context, note var uses. */
if (__builtin_expect (wtd->omp_ctx != NULL, 0)
&& omp_var_to_track (TREE_OPERAND (stmt, 0)))
omp_cxx_notice_variable (wtd->omp_ctx, TREE_OPERAND (stmt, 0));
*stmt_p = convert (TREE_TYPE (stmt), TREE_OPERAND (stmt, 0));
*walk_subtrees = 0;
}
else if (TREE_CODE (stmt) == RETURN_EXPR
&& TREE_OPERAND (stmt, 0)
&& is_invisiref_parm (TREE_OPERAND (stmt, 0)))
/* Don't dereference an invisiref RESULT_DECL inside a RETURN_EXPR. */
*walk_subtrees = 0;
else if (TREE_CODE (stmt) == OMP_CLAUSE)
switch (OMP_CLAUSE_CODE (stmt))
{
case OMP_CLAUSE_LASTPRIVATE:
/* Don't dereference an invisiref in OpenMP clauses. */
if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
{
*walk_subtrees = 0;
if (OMP_CLAUSE_LASTPRIVATE_STMT (stmt))
cp_walk_tree (&OMP_CLAUSE_LASTPRIVATE_STMT (stmt),
cp_genericize_r, data, NULL);
}
break;
case OMP_CLAUSE_PRIVATE:
/* Don't dereference an invisiref in OpenMP clauses. */
if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
*walk_subtrees = 0;
else if (wtd->omp_ctx != NULL)
{
/* Private clause doesn't cause any references to the
var in outer contexts, avoid calling
omp_cxx_notice_variable for it. */
struct cp_genericize_omp_taskreg *old = wtd->omp_ctx;
wtd->omp_ctx = NULL;
cp_walk_tree (&OMP_CLAUSE_DECL (stmt), cp_genericize_r,
data, NULL);
wtd->omp_ctx = old;
*walk_subtrees = 0;
}
break;
case OMP_CLAUSE_SHARED:
case OMP_CLAUSE_FIRSTPRIVATE:
case OMP_CLAUSE_COPYIN:
case OMP_CLAUSE_COPYPRIVATE:
/* Don't dereference an invisiref in OpenMP clauses. */
if (is_invisiref_parm (OMP_CLAUSE_DECL (stmt)))
*walk_subtrees = 0;
break;
case OMP_CLAUSE_REDUCTION:
gcc_assert (!is_invisiref_parm (OMP_CLAUSE_DECL (stmt)));
break;
default:
break;
}
else if (IS_TYPE_OR_DECL_P (stmt))
*walk_subtrees = 0;
/* Due to the way voidify_wrapper_expr is written, we don't get a chance
to lower this construct before scanning it, so we need to lower these
before doing anything else. */
else if (TREE_CODE (stmt) == CLEANUP_STMT)
*stmt_p = build2 (CLEANUP_EH_ONLY (stmt) ? TRY_CATCH_EXPR
: TRY_FINALLY_EXPR,
void_type_node,
CLEANUP_BODY (stmt),
CLEANUP_EXPR (stmt));
else if (TREE_CODE (stmt) == IF_STMT)
{
genericize_if_stmt (stmt_p);
/* *stmt_p has changed, tail recurse to handle it again. */
return cp_genericize_r (stmt_p, walk_subtrees, data);
}
/* COND_EXPR might have incompatible types in branches if one or both
arms are bitfields. Fix it up now. */
else if (TREE_CODE (stmt) == COND_EXPR)
{
tree type_left
= (TREE_OPERAND (stmt, 1)
? is_bitfield_expr_with_lowered_type (TREE_OPERAND (stmt, 1))
: NULL_TREE);
tree type_right
= (TREE_OPERAND (stmt, 2)
? is_bitfield_expr_with_lowered_type (TREE_OPERAND (stmt, 2))
: NULL_TREE);
if (type_left
&& !useless_type_conversion_p (TREE_TYPE (stmt),
TREE_TYPE (TREE_OPERAND (stmt, 1))))
{
TREE_OPERAND (stmt, 1)
= fold_convert (type_left, TREE_OPERAND (stmt, 1));
gcc_assert (useless_type_conversion_p (TREE_TYPE (stmt),
type_left));
}
if (type_right
&& !useless_type_conversion_p (TREE_TYPE (stmt),
TREE_TYPE (TREE_OPERAND (stmt, 2))))
{
TREE_OPERAND (stmt, 2)
= fold_convert (type_right, TREE_OPERAND (stmt, 2));
gcc_assert (useless_type_conversion_p (TREE_TYPE (stmt),
type_right));
}
}
else if (TREE_CODE (stmt) == BIND_EXPR)
{
if (__builtin_expect (wtd->omp_ctx != NULL, 0))
{
tree decl;
for (decl = BIND_EXPR_VARS (stmt); decl; decl = DECL_CHAIN (decl))