/* This file contains the definitions and documentation for the common
tree codes used in the GNU C and C++ compilers (see c-common.def
- for the standard codes).
- Copyright (C) 2000 Free Software Foundation, Inc. Written by
- Benjamin Chelf (chelf@codesourcery.com).
+ for the standard codes).
+ Copyright (C) 2000, 2001, 2002, 2003, 2004 Free Software Foundation, Inc.
+ Written by Benjamin Chelf (chelf@codesourcery.com).
-This file is part of GNU CC.
+This file is part of GCC.
-GNU CC 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 2, or (at your option)
-any later version.
+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 2, or (at your option) any later
+version.
-GNU CC 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.
+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 GNU CC; see the file COPYING. If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA. */
+along with GCC; see the file COPYING. If not, write to the Free
+Software Foundation, 59 Temple Place - Suite 330, Boston, MA
+02111-1307, USA. */
#include "config.h"
#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
#include "tree.h"
#include "function.h"
#include "splay-tree.h"
#include "varray.h"
#include "c-common.h"
#include "except.h"
+/* In order for the format checking to accept the C frontend
+ diagnostic framework extensions, you must define this token before
+ including toplev.h. */
+#define GCC_DIAG_STYLE __gcc_cdiag__
#include "toplev.h"
#include "flags.h"
#include "ggc.h"
#include "rtl.h"
+#include "expr.h"
#include "output.h"
#include "timevar.h"
+#include "predict.h"
+#include "tree-inline.h"
/* If non-NULL, the address of a language-specific function for
expanding statements. */
-void (*lang_expand_stmt) PARAMS ((tree));
+void (*lang_expand_stmt) (tree);
-static tree prune_unused_decls PARAMS ((tree *, int *, void *));
+/* If non-NULL, the address of a language-specific function for
+ expanding a DECL_STMT. After the language-independent cases are
+ handled, this function will be called. If this function is not
+ defined, it is assumed that declarations other than those for
+ variables and labels do not require any RTL generation. */
+void (*lang_expand_decl_stmt) (tree);
+
+static tree find_reachable_label_1 (tree *, int *, void *);
+static tree find_reachable_label (tree);
+static bool expand_unreachable_if_stmt (tree);
+static tree expand_unreachable_stmt (tree, int);
+static void genrtl_do_stmt_1 (tree, tree);
/* Create an empty statement tree rooted at T. */
void
-begin_stmt_tree (t)
- tree *t;
+begin_stmt_tree (tree *t)
{
/* We create a trivial EXPR_STMT so that last_tree is never NULL in
what follows. We remove the extraneous statement in
*t = build_nt (EXPR_STMT, void_zero_node);
last_tree = *t;
last_expr_type = NULL_TREE;
+ last_expr_filename = input_filename;
}
/* T is a statement. Add it to the statement-tree. */
tree
-add_stmt (t)
- tree t;
+add_stmt (tree t)
{
+ if (input_filename != last_expr_filename)
+ {
+ /* If the filename has changed, also add in a FILE_STMT. Do a string
+ compare first, though, as it might be an equivalent string. */
+ int add = (strcmp (input_filename, last_expr_filename) != 0);
+ last_expr_filename = input_filename;
+ if (add)
+ {
+ tree pos = build_nt (FILE_STMT, get_identifier (input_filename));
+ add_stmt (pos);
+ }
+ }
+
/* Add T to the statement-tree. */
TREE_CHAIN (last_tree) = t;
last_tree = t;
+
/* When we expand a statement-tree, we must know whether or not the
- statements are full-expresions. We record that fact here. */
+ statements are full-expressions. We record that fact here. */
STMT_IS_FULL_EXPR_P (last_tree) = stmts_are_full_exprs_p ();
+
return t;
}
-/* Remove declarations of internal variables that are not used from a
- stmt tree. To qualify, the variable must have a name and must have
- a zero DECL_SOURCE_LINE. We tried to remove all variables for
- which TREE_USED was false, but it turns out that there's tons of
- variables for which TREE_USED is false but that are still in fact
- used. */
+/* Create a declaration statement for the declaration given by the
+ DECL. */
-static tree
-prune_unused_decls (tp, walk_subtrees, data)
- tree *tp;
- int *walk_subtrees ATTRIBUTE_UNUSED;
- void *data ATTRIBUTE_UNUSED;
+void
+add_decl_stmt (tree decl)
{
- tree t = *tp;
+ tree decl_stmt;
- if (t == NULL_TREE)
- {
- *walk_subtrees = 0;
- return NULL_TREE;
- }
+ /* We need the type to last until instantiation time. */
+ decl_stmt = build_stmt (DECL_STMT, decl);
+ add_stmt (decl_stmt);
+}
- if (TREE_CODE (t) == DECL_STMT)
+/* Add a scope-statement to the statement-tree. BEGIN_P indicates
+ whether this statements opens or closes a scope. PARTIAL_P is true
+ for a partial scope, i.e, the scope that begins after a label when
+ an object that needs a cleanup is created. If BEGIN_P is nonzero,
+ returns a new TREE_LIST representing the top of the SCOPE_STMT
+ stack. The TREE_PURPOSE is the new SCOPE_STMT. If BEGIN_P is
+ zero, returns a TREE_LIST whose TREE_VALUE is the new SCOPE_STMT,
+ and whose TREE_PURPOSE is the matching SCOPE_STMT with
+ SCOPE_BEGIN_P set. */
+
+tree
+add_scope_stmt (int begin_p, int partial_p)
+{
+ tree *stack_ptr = current_scope_stmt_stack ();
+ tree ss;
+ tree top = *stack_ptr;
+
+ /* Build the statement. */
+ ss = build_stmt (SCOPE_STMT, NULL_TREE);
+ SCOPE_BEGIN_P (ss) = begin_p;
+ SCOPE_PARTIAL_P (ss) = partial_p;
+
+ /* Keep the scope stack up to date. */
+ if (begin_p)
{
- tree d = DECL_STMT_DECL (t);
- if (!TREE_USED (d) && DECL_NAME (d) && DECL_SOURCE_LINE (d) == 0)
- {
- *tp = TREE_CHAIN (t);
- /* Recurse on the new value of tp, otherwise we will skip
- the next statement. */
- return prune_unused_decls (tp, walk_subtrees, data);
- }
+ top = tree_cons (ss, NULL_TREE, top);
+ *stack_ptr = top;
}
- else if (TREE_CODE (t) == SCOPE_STMT)
+ else
{
- /* Remove all unused decls from the BLOCK of this SCOPE_STMT. */
- tree block = SCOPE_STMT_BLOCK (t);
+ if (partial_p != SCOPE_PARTIAL_P (TREE_PURPOSE (top)))
+ abort ();
+ TREE_VALUE (top) = ss;
+ *stack_ptr = TREE_CHAIN (top);
+ }
- if (block)
- {
- tree *vp;
+ /* Add the new statement to the statement-tree. */
+ add_stmt (ss);
- for (vp = &BLOCK_VARS (block); *vp; )
- {
- tree v = *vp;
- if (! TREE_USED (v) && DECL_NAME (v) && DECL_SOURCE_LINE (v) == 0)
- *vp = TREE_CHAIN (v); /* drop */
- else
- vp = &TREE_CHAIN (v); /* advance */
- }
- /* If there are now no variables, the entire BLOCK can be dropped.
- (This causes SCOPE_NULLIFIED_P (t) to be true.) */
- if (BLOCK_VARS (block) == NULL_TREE)
- SCOPE_STMT_BLOCK (t) = NULL_TREE;
- }
- }
- return NULL_TREE;
+ return top;
}
/* Finish the statement tree rooted at T. */
void
-finish_stmt_tree (t)
- tree *t;
+finish_stmt_tree (tree *t)
{
tree stmt;
-
+
/* Remove the fake extra statement added in begin_stmt_tree. */
stmt = TREE_CHAIN (*t);
*t = stmt;
last_tree = NULL_TREE;
- /* Remove unused decls from the stmt tree. */
- walk_stmt_tree (t, prune_unused_decls, NULL);
-
- if (cfun)
+ if (cfun && stmt)
{
/* The line-number recorded in the outermost statement in a function
is the line number of the end of the function. */
- STMT_LINENO (stmt) = lineno;
+ STMT_LINENO (stmt) = input_line;
STMT_LINENO_FOR_FN_P (stmt) = 1;
}
}
/* Build a generic statement based on the given type of node and
arguments. Similar to `build_nt', except that we set
- TREE_COMPLEXITY to be the current line number. */
+ STMT_LINENO to be the current line number. */
+/* ??? This should be obsolete with the lineno_stmt productions
+ in the grammar. */
tree
-build_stmt VPARAMS ((enum tree_code code, ...))
+build_stmt (enum tree_code code, ...)
{
-#ifndef ANSI_PROTOTYPES
- enum tree_code code;
-#endif
+ tree t;
+ int length;
+ int i;
va_list p;
- register tree t;
- register int length;
- register int i;
-
- VA_START (p, code);
-#ifndef ANSI_PROTOTYPES
- code = va_arg (p, enum tree_code);
-#endif
+ va_start (p, code);
t = make_node (code);
length = TREE_CODE_LENGTH (code);
- TREE_COMPLEXITY (t) = lineno;
+ STMT_LINENO (t) = input_line;
for (i = 0; i < length; i++)
TREE_OPERAND (t, i) = va_arg (p, tree);
as the condition is returned. Otherwise, T itself is returned. */
tree
-expand_cond (t)
- tree t;
+expand_cond (tree t)
{
if (t && TREE_CODE (t) == TREE_LIST)
{
expand_stmt (TREE_PURPOSE (t));
return TREE_VALUE (t);
}
- else
+ else
return t;
}
/* Create RTL for the local static variable DECL. */
void
-make_rtl_for_local_static (decl)
- tree decl;
+make_rtl_for_local_static (tree decl)
{
const char *asmspec = NULL;
if (TREE_ASM_WRITTEN (decl))
return;
- if (DECL_ASSEMBLER_NAME (decl) != DECL_NAME (decl))
- {
- /* The only way this situaton can occur is if the
- user specified a name for this DECL using the
- `attribute' syntax. */
- asmspec = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
- DECL_ASSEMBLER_NAME (decl) = DECL_NAME (decl);
- }
+ /* If the DECL_ASSEMBLER_NAME is not the same as the DECL_NAME, then
+ either we already created RTL for this DECL (and since it was a
+ local variable, its DECL_ASSEMBLER_NAME got hacked up to prevent
+ clashes with other local statics with the same name by a previous
+ call to make_decl_rtl), or the user explicitly requested a
+ particular assembly name for this variable, using the GNU
+ extension for this purpose:
+
+ int i asm ("j");
+
+ There's no way to know which case we're in, here. But, it turns
+ out we're safe. If there's already RTL, then
+ rest_of_decl_compilation ignores the ASMSPEC parameter, so we
+ may as well not pass it in. If there isn't RTL, then we didn't
+ already create RTL, which means that the modification to
+ DECL_ASSEMBLER_NAME came only via the explicit extension. */
+ if (DECL_ASSEMBLER_NAME (decl) != DECL_NAME (decl)
+ && !DECL_RTL_SET_P (decl))
+ asmspec = IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl));
rest_of_decl_compilation (decl, asmspec, /*top_level=*/0, /*at_end=*/0);
}
/* Let the back-end know about DECL. */
void
-emit_local_var (decl)
- tree decl;
+emit_local_var (tree decl)
{
/* Create RTL for this variable. */
- if (!DECL_RTL (decl))
+ if (!DECL_RTL_SET_P (decl))
{
- if (DECL_ASSEMBLER_NAME (decl) != DECL_NAME (decl))
- /* The user must have specified an assembler name for this
- variable. Set that up now. */
+ if (DECL_C_HARD_REGISTER (decl))
+ /* The user specified an assembler name for this variable.
+ Set that up now. */
rest_of_decl_compilation
(decl, IDENTIFIER_POINTER (DECL_ASSEMBLER_NAME (decl)),
/*top_level=*/0, /*at_end=*/0);
expand_decl (decl);
}
- /* Actually do the initialization. */
- if (stmts_are_full_exprs_p ())
- expand_start_target_temps ();
+ if (DECL_INITIAL (decl))
+ {
+ /* Actually do the initialization. */
+ if (stmts_are_full_exprs_p ())
+ expand_start_target_temps ();
- expand_decl_init (decl);
+ expand_decl_init (decl);
- if (stmts_are_full_exprs_p ())
- expand_end_target_temps ();
+ if (stmts_are_full_exprs_p ())
+ expand_end_target_temps ();
+ }
}
-/* Helper for generating the RTL at the beginning of a scope. */
+/* Helper for generating the RTL at the beginning of a scope. */
void
-genrtl_do_pushlevel ()
+genrtl_do_pushlevel (void)
{
- emit_line_note (input_filename, lineno);
+ emit_line_note (input_location);
clear_last_expr ();
}
-/* Helper for generating the RTL. */
+/* Generate the RTL for DESTINATION, which is a GOTO_STMT. */
void
-genrtl_clear_out_block ()
-{
- /* If COND wasn't a declaration, clear out the
- block we made for it and start a new one here so the
- optimization in expand_end_loop will work. */
- if (getdecls () == NULL_TREE)
- genrtl_do_pushlevel ();
-}
-
-/* Generate the RTL for DESTINATION, which is a GOTO_STMT. */
-
-void
-genrtl_goto_stmt (destination)
- tree destination;
+genrtl_goto_stmt (tree destination)
{
if (TREE_CODE (destination) == IDENTIFIER_NODE)
abort ();
-
+
/* 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;
-
- emit_line_note (input_filename, lineno);
-
+
+ emit_line_note (input_location);
+
if (TREE_CODE (destination) == LABEL_DECL)
{
label_rtx (destination);
- expand_goto (destination);
+ expand_goto (destination);
}
else
expand_computed_goto (destination);
}
-/* Generate the RTL for EXPR, which is an EXPR_STMT. */
+/* Generate the RTL for EXPR, which is an EXPR_STMT. Provided just
+ for backward compatibility. genrtl_expr_stmt_value() should be
+ used for new code. */
-void
-genrtl_expr_stmt (expr)
- tree expr;
+void
+genrtl_expr_stmt (tree expr)
+{
+ genrtl_expr_stmt_value (expr, -1, 1);
+}
+
+/* Generate the RTL for EXPR, which is an EXPR_STMT. WANT_VALUE tells
+ whether to (1) save the value of the expression, (0) discard it or
+ (-1) use expr_stmts_for_value to tell. The use of -1 is
+ deprecated, and retained only for backward compatibility.
+ MAYBE_LAST is nonzero if this EXPR_STMT might be the last statement
+ in expression statement. */
+
+void
+genrtl_expr_stmt_value (tree expr, int want_value, int maybe_last)
{
if (expr != NULL_TREE)
{
- emit_line_note (input_filename, lineno);
-
+ emit_line_note (input_location);
+
if (stmts_are_full_exprs_p ())
expand_start_target_temps ();
-
- lang_expand_expr_stmt (expr);
-
+
+ if (expr != error_mark_node)
+ expand_expr_stmt_value (expr, want_value, maybe_last);
+
if (stmts_are_full_exprs_p ())
expand_end_target_temps ();
}
}
-/* Generate the RTL for T, which is a DECL_STMT. */
+/* Generate the RTL for T, which is a DECL_STMT. */
void
-genrtl_decl_stmt (t)
- tree t;
+genrtl_decl_stmt (tree t)
{
tree decl;
- emit_line_note (input_filename, lineno);
+ emit_line_note (input_location);
decl = DECL_STMT_DECL (t);
/* If this is a declaration for an automatic local
variable, initialize it. Note that we might also see a
`extern'). We don't have to handle the initialization
of those objects here; they can only be declarations,
rather than definitions. */
- if (TREE_CODE (decl) == VAR_DECL
+ if (TREE_CODE (decl) == VAR_DECL
&& !TREE_STATIC (decl)
&& !DECL_EXTERNAL (decl))
{
if (!anon_aggr_type_p (TREE_TYPE (decl)))
emit_local_var (decl);
else
- expand_anon_union_decl (decl, NULL_TREE,
+ expand_anon_union_decl (decl, NULL_TREE,
DECL_ANON_UNION_ELEMS (decl));
}
else if (TREE_CODE (decl) == VAR_DECL && TREE_STATIC (decl))
- {
- if (DECL_ARTIFICIAL (decl) && ! TREE_USED (decl))
- /* Do not emit unused decls. This is not just an
- optimization. We really do not want to emit
- __PRETTY_FUNCTION__ etc, if they're never used. */
- DECL_IGNORED_P (decl) = 1;
- else
- make_rtl_for_local_static (decl);
- }
+ make_rtl_for_local_static (decl);
+ else if (TREE_CODE (decl) == LABEL_DECL
+ && C_DECLARED_LABEL_FLAG (decl))
+ declare_nonlocal_label (decl);
+ else if (lang_expand_decl_stmt)
+ (*lang_expand_decl_stmt) (t);
}
-/* Generate the RTL for T, which is an IF_STMT. */
+/* Generate the RTL for T, which is an IF_STMT. */
void
-genrtl_if_stmt (t)
- tree t;
+genrtl_if_stmt (tree t)
{
tree cond;
genrtl_do_pushlevel ();
cond = expand_cond (IF_COND (t));
- emit_line_note (input_filename, lineno);
+ emit_line_note (input_location);
expand_start_cond (cond, 0);
if (THEN_CLAUSE (t))
- expand_stmt (THEN_CLAUSE (t));
+ {
+ tree nextt = THEN_CLAUSE (t);
+
+ if (cond && integer_zerop (cond))
+ nextt = expand_unreachable_stmt (nextt, warn_notreached);
+ expand_stmt (nextt);
+ }
+
if (ELSE_CLAUSE (t))
{
+ tree nextt = ELSE_CLAUSE (t);
expand_start_else ();
- expand_stmt (ELSE_CLAUSE (t));
+ if (cond && integer_nonzerop (cond))
+ nextt = expand_unreachable_stmt (nextt, warn_notreached);
+ expand_stmt (nextt);
}
expand_end_cond ();
}
-/* Generate the RTL for T, which is a WHILE_STMT. */
+/* Generate the RTL for T, which is a WHILE_STMT. */
void
-genrtl_while_stmt (t)
- tree t;
+genrtl_while_stmt (tree t)
{
- tree cond;
- emit_nop ();
- emit_line_note (input_filename, lineno);
- expand_start_loop (1);
+ tree cond = WHILE_COND (t);
+
+ emit_line_note (input_location);
+ expand_start_loop (1);
genrtl_do_pushlevel ();
- cond = expand_cond (WHILE_COND (t));
- emit_line_note (input_filename, lineno);
- expand_exit_loop_if_false (0, cond);
- genrtl_clear_out_block ();
-
+ if (cond && !integer_nonzerop (cond))
+ {
+ cond = expand_cond (cond);
+ emit_line_note (input_location);
+ expand_exit_loop_top_cond (0, cond);
+ genrtl_do_pushlevel ();
+ }
+
expand_stmt (WHILE_BODY (t));
expand_end_loop ();
}
-/* Generate the RTL for T, which is a DO_STMT. */
+/* Generate the RTL for a DO_STMT with condition COND and loop BODY
+ body. This is reused for expanding unreachable WHILE_STMTS. */
-void
-genrtl_do_stmt (t)
- tree t;
+static void
+genrtl_do_stmt_1 (tree cond, tree body)
{
- tree cond;
- emit_nop ();
- emit_line_note (input_filename, lineno);
- expand_start_loop_continue_elsewhere (1);
+ /* Recognize the common special-case of do { ... } while (0) and do
+ not emit the loop widgetry in this case. In particular this
+ avoids cluttering the rtl with dummy loop notes, which can affect
+ alignment of adjacent labels. COND can be NULL due to parse
+ errors. */
+ if (!cond || integer_zerop (cond))
+ {
+ expand_start_null_loop ();
+ expand_stmt (body);
+ expand_end_null_loop ();
+ }
+ else if (integer_nonzerop (cond))
+ {
+ emit_line_note (input_location);
+ expand_start_loop (1);
- expand_stmt (DO_BODY (t));
+ expand_stmt (body);
- expand_loop_continue_here ();
+ emit_line_note (input_location);
+ expand_end_loop ();
+ }
+ else
+ {
+ emit_line_note (input_location);
+ expand_start_loop_continue_elsewhere (1);
- cond = expand_cond (DO_COND (t));
- emit_line_note (input_filename, lineno);
- expand_exit_loop_if_false (0, cond);
- expand_end_loop ();
+ expand_stmt (body);
+
+ expand_loop_continue_here ();
+ cond = expand_cond (cond);
+ emit_line_note (input_location);
+ expand_exit_loop_if_false (0, cond);
+ expand_end_loop ();
+ }
}
-/* Build the node for a return statement and return it. */
+/* Generate the RTL for T, which is a DO_STMT. */
+
+void
+genrtl_do_stmt (tree t)
+{
+ genrtl_do_stmt_1 (DO_COND (t), DO_BODY (t));
+}
+
+/* Build the node for a return statement and return it. */
tree
-build_return_stmt (expr)
- tree expr;
+build_return_stmt (tree expr)
{
return (build_stmt (RETURN_STMT, expr));
}
-/* Generate the RTL for STMT, which is a RETURN_STMT. */
+/* Generate the RTL for STMT, which is a RETURN_STMT. */
void
-genrtl_return_stmt (stmt)
- tree stmt;
+genrtl_return_stmt (tree stmt)
{
- tree expr = RETURN_EXPR (stmt);
+ tree expr;
- emit_line_note (input_filename, lineno);
+ expr = RETURN_STMT_EXPR (stmt);
+
+ emit_line_note (input_location);
if (!expr)
expand_null_return ();
else
}
}
-/* Generate the RTL for T, which is a FOR_STMT. */
+/* Generate the RTL for T, which is a FOR_STMT. */
void
-genrtl_for_stmt (t)
- tree t;
+genrtl_for_stmt (tree t)
{
- tree tmp;
- tree cond;
+ tree cond = FOR_COND (t);
+ location_t saved_loc;
+
if (NEW_FOR_SCOPE_P (t))
genrtl_do_pushlevel ();
expand_stmt (FOR_INIT_STMT (t));
- emit_nop ();
- emit_line_note (input_filename, lineno);
- expand_start_loop_continue_elsewhere (1);
+ /* Expand the initialization. */
+ emit_line_note (input_location);
+ if (FOR_EXPR (t))
+ expand_start_loop_continue_elsewhere (1);
+ else
+ expand_start_loop (1);
genrtl_do_pushlevel ();
- cond = expand_cond (FOR_COND (t));
- emit_line_note (input_filename, lineno);
- if (cond)
- expand_exit_loop_if_false (0, cond);
- genrtl_clear_out_block ();
- tmp = FOR_EXPR (t);
+ /* Save the filename and line number so that we expand the FOR_EXPR
+ we can reset them back to the saved values. */
+ saved_loc = input_location;
+
+ /* Expand the condition. */
+ if (cond && !integer_nonzerop (cond))
+ {
+ cond = expand_cond (cond);
+ emit_line_note (input_location);
+ expand_exit_loop_top_cond (0, cond);
+ genrtl_do_pushlevel ();
+ }
+
+ /* Expand the body. */
expand_stmt (FOR_BODY (t));
- emit_line_note (input_filename, lineno);
- expand_loop_continue_here ();
- if (tmp)
- genrtl_expr_stmt (tmp);
+ /* Expand the increment expression. */
+ input_location = saved_loc;
+ emit_line_note (input_location);
+ if (FOR_EXPR (t))
+ {
+ expand_loop_continue_here ();
+ genrtl_expr_stmt (FOR_EXPR (t));
+ }
expand_end_loop ();
}
-/* Build a break statement node and return it. */
+/* Build a break statement node and return it. */
tree
-build_break_stmt ()
+build_break_stmt (void)
{
return (build_stmt (BREAK_STMT));
}
-/* Generate the RTL for a BREAK_STMT. */
+/* Generate the RTL for a BREAK_STMT. */
void
-genrtl_break_stmt ()
+genrtl_break_stmt (void)
{
- emit_line_note (input_filename, lineno);
+ emit_line_note (input_location);
if ( ! expand_exit_something ())
- error ("break statement not within loop or switch");
+ abort ();
}
-/* Build a continue statement node and return it. */
+/* Build a continue statement node and return it. */
tree
-build_continue_stmt ()
+build_continue_stmt (void)
{
return (build_stmt (CONTINUE_STMT));
}
-/* Generate the RTL for a CONTINUE_STMT. */
+/* Generate the RTL for a CONTINUE_STMT. */
void
-genrtl_continue_stmt ()
+genrtl_continue_stmt (void)
{
- emit_line_note (input_filename, lineno);
+ emit_line_note (input_location);
if (! expand_continue_loop (0))
- error ("continue statement not within a loop");
+ abort ();
}
-/* Generate the RTL for T, which is a SCOPE_STMT. */
+/* Generate the RTL for T, which is a SCOPE_STMT. */
void
-genrtl_scope_stmt (t)
- tree t;
+genrtl_scope_stmt (tree t)
{
+ tree block = SCOPE_STMT_BLOCK (t);
+
if (!SCOPE_NO_CLEANUPS_P (t))
{
if (SCOPE_BEGIN_P (t))
- expand_start_bindings_and_block (2 * SCOPE_NULLIFIED_P (t),
- SCOPE_STMT_BLOCK (t));
+ expand_start_bindings_and_block (2 * SCOPE_NULLIFIED_P (t), block);
else if (SCOPE_END_P (t))
expand_end_bindings (NULL_TREE, !SCOPE_NULLIFIED_P (t), 0);
}
else if (!SCOPE_NULLIFIED_P (t))
{
- rtx note = emit_note (NULL,
- (SCOPE_BEGIN_P (t)
- ? NOTE_INSN_BLOCK_BEG
- : NOTE_INSN_BLOCK_END));
- NOTE_BLOCK (note) = SCOPE_STMT_BLOCK (t);
+ rtx note = emit_note (SCOPE_BEGIN_P (t)
+ ? NOTE_INSN_BLOCK_BEG : NOTE_INSN_BLOCK_END);
+ NOTE_BLOCK (note) = block;
+ }
+
+ /* If we're at the end of a scope that contains inlined nested
+ functions, we have to decide whether or not to write them out. */
+ if (block && SCOPE_END_P (t))
+ {
+ tree fn;
+
+ for (fn = BLOCK_VARS (block); fn; fn = TREE_CHAIN (fn))
+ {
+ if (TREE_CODE (fn) == FUNCTION_DECL
+ && DECL_CONTEXT (fn) == current_function_decl
+ && DECL_STRUCT_FUNCTION (fn)
+ && DECL_STRUCT_FUNCTION (fn)->saved_for_inline
+ && !TREE_ASM_WRITTEN (fn)
+ && TREE_ADDRESSABLE (fn))
+ {
+ push_function_context ();
+ output_inline_function (fn);
+ pop_function_context ();
+ }
+ }
}
}
-/* Generate the RTL for T, which is a SWITCH_STMT. */
+/* Generate the RTL for T, which is a SWITCH_STMT. */
void
-genrtl_switch_stmt (t)
- tree t;
+genrtl_switch_stmt (tree t)
{
tree cond;
genrtl_do_pushlevel ();
-
+
cond = expand_cond (SWITCH_COND (t));
if (cond == error_mark_node)
/* The code is in error, but we don't want expand_end_case to
- crash. */
- cond = boolean_false_node;
+ crash. */
+ cond = truthvalue_false_node;
- emit_line_note (input_filename, lineno);
+ emit_line_note (input_location);
expand_start_case (1, cond, TREE_TYPE (cond), "switch statement");
- expand_stmt (SWITCH_BODY (t));
- expand_end_case (cond);
+ expand_stmt (expand_unreachable_stmt (SWITCH_BODY (t), warn_notreached));
+ expand_end_case_type (cond, SWITCH_TYPE (t));
}
-/* Create a CASE_LABEL tree node and return it. */
+/* Create a CASE_LABEL tree node and return it. */
tree
-build_case_label (low_value, high_value, label_decl)
- tree low_value;
- tree high_value;
- tree label_decl;
+build_case_label (tree low_value, tree high_value, tree label_decl)
{
return build_stmt (CASE_LABEL, low_value, high_value, label_decl);
}
-/* Generate the RTL for a CASE_LABEL. */
+/* Generate the RTL for a CASE_LABEL. */
-void
-genrtl_case_label (case_label)
- tree case_label;
+void
+genrtl_case_label (tree case_label)
{
tree duplicate;
- add_case_node (CASE_LOW (case_label), CASE_HIGH (case_label),
+ tree cleanup;
+
+ cleanup = last_cleanup_this_contour ();
+ if (cleanup)
+ {
+ static int explained = 0;
+ warning ("destructor needed for `%D'", (TREE_PURPOSE (cleanup)));
+ warning ("where case label appears here");
+ if (!explained)
+ {
+ warning ("(enclose actions of previous case statements requiring destructors in their own scope.)");
+ explained = 1;
+ }
+ }
+
+ add_case_node (CASE_LOW (case_label), CASE_HIGH (case_label),
CASE_LABEL_DECL (case_label), &duplicate);
}
-/* Generate the RTL for T, which is a COMPOUND_STMT. */
+/* Generate the RTL for T, which is a COMPOUND_STMT. */
void
-genrtl_compound_stmt (t)
- tree t;
-{
- /* If this is the outermost block of the function, declare the
- variables __FUNCTION__, __PRETTY_FUNCTION__, and so forth. */
- if (cfun
- && !current_function_name_declared ()
- && !COMPOUND_STMT_NO_SCOPE (t))
- {
- set_current_function_name_declared (1);
- declare_function_name ();
- }
+genrtl_compound_stmt (tree t)
+{
+#ifdef ENABLE_CHECKING
+ struct nesting *n = current_nesting_level ();
+#endif
expand_stmt (COMPOUND_BODY (t));
+
+#ifdef ENABLE_CHECKING
+ /* Make sure that we've pushed and popped the same number of levels. */
+ if (!COMPOUND_STMT_NO_SCOPE (t) && n != current_nesting_level ())
+ abort ();
+#endif
}
-/* Generate the RTL for an ASM_STMT. */
+/* Generate the RTL for an ASM_STMT. */
void
-genrtl_asm_stmt (cv_qualifier, string, output_operands,
- input_operands, clobbers)
- tree cv_qualifier;
- tree string;
- tree output_operands;
- tree input_operands;
- tree clobbers;
+genrtl_asm_stmt (tree cv_qualifier, tree string, tree output_operands,
+ tree input_operands, tree clobbers, int asm_input_p)
{
- if (TREE_CHAIN (string))
- string = combine_strings (string);
-
if (cv_qualifier != NULL_TREE
&& cv_qualifier != ridpointers[(int) RID_VOLATILE])
{
cv_qualifier = NULL_TREE;
}
- emit_line_note (input_filename, lineno);
- if (output_operands != NULL_TREE || input_operands != NULL_TREE
- || clobbers != NULL_TREE)
- c_expand_asm_operands (string, output_operands,
- input_operands,
- clobbers,
- cv_qualifier != NULL_TREE,
- input_filename, lineno);
+ emit_line_note (input_location);
+ if (asm_input_p)
+ expand_asm (string, cv_qualifier != NULL_TREE);
else
- expand_asm (string);
+ c_expand_asm_operands (string, output_operands, input_operands,
+ clobbers, cv_qualifier != NULL_TREE,
+ input_location);
}
-/* Generate the RTL for a DECL_CLEANUP. */
+/* Generate the RTL for a CLEANUP_STMT. */
-void
-genrtl_decl_cleanup (decl, cleanup)
- tree decl;
- tree cleanup;
+void
+genrtl_cleanup_stmt (tree t)
{
- if (!decl || (DECL_SIZE (decl) && TREE_TYPE (decl) != error_mark_node))
- expand_decl_cleanup (decl, cleanup);
+ tree decl = CLEANUP_DECL (t);
+ if (!decl || !DECL_P (decl)
+ || (DECL_SIZE (decl) && TREE_TYPE (decl) != error_mark_node))
+ expand_decl_cleanup_eh (decl, CLEANUP_EXPR (t), CLEANUP_EH_ONLY (t));
}
/* We're about to expand T, a statement. Set up appropriate context
for the substitution. */
void
-prep_stmt (t)
- tree t;
+prep_stmt (tree t)
{
if (!STMT_LINENO_FOR_FN_P (t))
- lineno = STMT_LINENO (t);
+ input_line = STMT_LINENO (t);
current_stmt_tree ()->stmts_are_full_exprs_p = STMT_IS_FULL_EXPR_P (t);
}
/* Generate the RTL for the statement T, its substatements, and any
- other statements at its nesting level. */
+ other statements at its nesting level. */
void
-expand_stmt (t)
- tree t;
+expand_stmt (tree t)
{
while (t && t != error_mark_node)
{
switch (TREE_CODE (t))
{
+ case FILE_STMT:
+ input_filename = FILE_STMT_FILENAME (t);
+ break;
+
case RETURN_STMT:
genrtl_return_stmt (t);
- break;
+ t = expand_unreachable_stmt (TREE_CHAIN (t), warn_notreached);
+ goto process_t;
case EXPR_STMT:
- genrtl_expr_stmt (EXPR_STMT_EXPR (t));
+ genrtl_expr_stmt_value (EXPR_STMT_EXPR (t), TREE_ADDRESSABLE (t),
+ TREE_CHAIN (t) == NULL
+ || (TREE_CODE (TREE_CHAIN (t)) == SCOPE_STMT
+ && TREE_CHAIN (TREE_CHAIN (t)) == NULL));
break;
case DECL_STMT:
case BREAK_STMT:
genrtl_break_stmt ();
- break;
+ t = expand_unreachable_stmt (TREE_CHAIN (t), warn_notreached);
+ goto process_t;
case CONTINUE_STMT:
genrtl_continue_stmt ();
- break;
+ t = expand_unreachable_stmt (TREE_CHAIN (t), warn_notreached);
+ goto process_t;
case SWITCH_STMT:
genrtl_switch_stmt (t);
break;
case GOTO_STMT:
+ /* Emit information for branch prediction. */
+ if (!GOTO_FAKE_P (t)
+ && TREE_CODE (GOTO_DESTINATION (t)) == LABEL_DECL
+ && flag_guess_branch_prob)
+ {
+ rtx note = emit_note (NOTE_INSN_PREDICTION);
+
+ NOTE_PREDICTION (note) = NOTE_PREDICT (PRED_GOTO, NOT_TAKEN);
+ }
genrtl_goto_stmt (GOTO_DESTINATION (t));
- break;
+ t = expand_unreachable_stmt (TREE_CHAIN (t), warn_notreached);
+ goto process_t;
case ASM_STMT:
genrtl_asm_stmt (ASM_CV_QUAL (t), ASM_STRING (t),
- ASM_OUTPUTS (t), ASM_INPUTS (t), ASM_CLOBBERS (t));
+ ASM_OUTPUTS (t), ASM_INPUTS (t),
+ ASM_CLOBBERS (t), ASM_INPUT_P (t));
+ break;
+
+ case SCOPE_STMT:
+ genrtl_scope_stmt (t);
+ break;
+
+ case CLEANUP_STMT:
+ genrtl_cleanup_stmt (t);
break;
default:
if (lang_expand_stmt)
(*lang_expand_stmt) (t);
- else
+ else
abort ();
break;
}
- /* Restore saved state. */
- current_stmt_tree ()->stmts_are_full_exprs_p =
- saved_stmts_are_full_exprs_p;
-
/* Go on to the next statement in this scope. */
t = TREE_CHAIN (t);
+
+ process_t:
+ /* Restore saved state. */
+ current_stmt_tree ()->stmts_are_full_exprs_p
+ = saved_stmts_are_full_exprs_p;
+ }
+}
+\f
+/* If *TP is a potentially reachable label, return nonzero. */
+
+static tree
+find_reachable_label_1 (tree *tp, int *walk_subtrees ATTRIBUTE_UNUSED,
+ void *data ATTRIBUTE_UNUSED)
+{
+ switch (TREE_CODE (*tp))
+ {
+ case LABEL_STMT:
+ case CASE_LABEL:
+ return *tp;
+
+ default:
+ break;
+ }
+ return NULL_TREE;
+}
+
+/* Determine whether expression EXP contains a potentially
+ reachable label. */
+static tree
+find_reachable_label (tree exp)
+{
+ location_t saved_loc = input_location;
+ tree ret = walk_tree_without_duplicates
+ (&exp, find_reachable_label_1, NULL);
+ input_location = saved_loc;
+ return ret;
+}
+
+/* Expand an unreachable if statement, T. This function returns
+ true if the IF_STMT contains a potentially reachable code_label. */
+static bool
+expand_unreachable_if_stmt (tree t)
+{
+ tree n;
+
+ if (find_reachable_label (IF_COND (t)) != NULL_TREE)
+ {
+ genrtl_if_stmt (t);
+ return true;
+ }
+
+ if (THEN_CLAUSE (t) && ELSE_CLAUSE (t))
+ {
+ n = expand_unreachable_stmt (THEN_CLAUSE (t), 0);
+
+ if (n != NULL_TREE)
+ {
+ rtx label;
+ expand_stmt (n);
+ label = gen_label_rtx ();
+ emit_jump (label);
+ expand_stmt (expand_unreachable_stmt (ELSE_CLAUSE (t), 0));
+ emit_label (label);
+ return true;
+ }
+ else
+ n = expand_unreachable_stmt (ELSE_CLAUSE (t), 0);
}
+ else if (THEN_CLAUSE (t))
+ n = expand_unreachable_stmt (THEN_CLAUSE (t), 0);
+ else if (ELSE_CLAUSE (t))
+ n = expand_unreachable_stmt (ELSE_CLAUSE (t), 0);
+ else
+ n = NULL_TREE;
+
+ expand_stmt (n);
+
+ return n != NULL_TREE;
}
+/* Expand an unreachable statement list. This function skips all
+ statements preceding the first potentially reachable label and
+ then returns the label (or, in same cases, the statement after
+ one containing the label). */
+static tree
+expand_unreachable_stmt (tree t, int warn)
+{
+ int saved;
+
+ while (t && t != error_mark_node)
+ {
+ if (warn)
+ switch (TREE_CODE (t))
+ {
+ case BREAK_STMT:
+ case CONTINUE_STMT:
+ case EXPR_STMT:
+ case GOTO_STMT:
+ case IF_STMT:
+ case RETURN_STMT:
+ if (!STMT_LINENO_FOR_FN_P (t))
+ input_line = STMT_LINENO (t);
+ warning("will never be executed");
+ warn = false;
+ break;
+
+ default:
+ break;
+ }
+
+ switch (TREE_CODE (t))
+ {
+ case GOTO_STMT:
+ case CONTINUE_STMT:
+ case BREAK_STMT:
+ break;
+
+ case FILE_STMT:
+ input_filename = FILE_STMT_FILENAME (t);
+ break;
+
+ case RETURN_STMT:
+ if (find_reachable_label (RETURN_STMT_EXPR (t)) != NULL_TREE)
+ return t;
+ break;
+
+ case EXPR_STMT:
+ if (find_reachable_label (EXPR_STMT_EXPR (t)) != NULL_TREE)
+ return t;
+ break;
+
+ case IF_STMT:
+ if (expand_unreachable_if_stmt (t))
+ return TREE_CHAIN (t);
+ break;
+
+ case WHILE_STMT:
+ /* If the start of a while statement is unreachable, there is
+ no need to rotate the loop, instead the WHILE_STMT can be
+ expanded like a DO_STMT. */
+ genrtl_do_stmt_1 (WHILE_COND (t), WHILE_BODY (t));
+ return TREE_CHAIN (t);
+
+ case COMPOUND_STMT:
+ {
+ tree n;
+ n = expand_unreachable_stmt (COMPOUND_BODY (t), warn);
+ if (n != NULL_TREE)
+ {
+ expand_stmt (n);
+ return TREE_CHAIN (t);
+ }
+ warn = false;
+ break;
+ }
+
+ case SCOPE_STMT:
+ saved = stmts_are_full_exprs_p ();
+ prep_stmt (t);
+ genrtl_scope_stmt (t);
+ current_stmt_tree ()->stmts_are_full_exprs_p = saved;
+ break;
+
+ default:
+ return t;
+ }
+ t = TREE_CHAIN (t);
+ }
+ return NULL_TREE;
+}
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