171 lines
4.4 KiB
C
171 lines
4.4 KiB
C
/* This file contains the definitions and documentation for the common
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tree codes used in the GNU C and C++ compilers (see c-common.def
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for the standard codes).
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Copyright (C) 2000, 2001, 2002, 2003, 2004, 2005, 2007
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Free Software Foundation, Inc.
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Written by Benjamin Chelf (chelf@codesourcery.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 3, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "tree.h"
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#include "function.h"
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#include "splay-tree.h"
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#include "varray.h"
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#include "c-common.h"
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#include "except.h"
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/* In order for the format checking to accept the C frontend
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diagnostic framework extensions, you must define this token before
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including toplev.h. */
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#define GCC_DIAG_STYLE __gcc_cdiag__
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#include "toplev.h"
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#include "flags.h"
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#include "ggc.h"
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#include "rtl.h"
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#include "output.h"
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#include "timevar.h"
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#include "predict.h"
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#include "tree-inline.h"
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#include "tree-gimple.h"
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#include "langhooks.h"
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/* Create an empty statement tree rooted at T. */
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tree
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push_stmt_list (void)
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{
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tree t;
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t = alloc_stmt_list ();
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TREE_CHAIN (t) = cur_stmt_list;
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cur_stmt_list = t;
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return t;
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}
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/* Finish the statement tree rooted at T. */
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tree
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pop_stmt_list (tree t)
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{
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tree u = cur_stmt_list, chain;
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/* Pop statement lists until we reach the target level. The extra
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nestings will be due to outstanding cleanups. */
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while (1)
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{
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chain = TREE_CHAIN (u);
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TREE_CHAIN (u) = NULL_TREE;
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if (t == u)
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break;
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u = chain;
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}
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cur_stmt_list = chain;
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/* If the statement list is completely empty, just return it. This is
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just as good small as build_empty_stmt, with the advantage that
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statement lists are merged when they appended to one another. So
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using the STATEMENT_LIST avoids pathological buildup of EMPTY_STMT_P
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statements. */
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if (TREE_SIDE_EFFECTS (t))
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{
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tree_stmt_iterator i = tsi_start (t);
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/* If the statement list contained exactly one statement, then
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extract it immediately. */
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if (tsi_one_before_end_p (i))
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{
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u = tsi_stmt (i);
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tsi_delink (&i);
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free_stmt_list (t);
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t = u;
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}
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}
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return t;
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}
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/* Build a generic statement based on the given type of node and
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arguments. Similar to `build_nt', except that we set
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EXPR_LOCATION to be the current source location. */
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/* ??? This should be obsolete with the lineno_stmt productions
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in the grammar. */
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tree
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build_stmt (enum tree_code code, ...)
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{
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tree ret;
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int length, i;
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va_list p;
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bool side_effects;
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/* This function cannot be used to construct variably-sized nodes. */
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gcc_assert (TREE_CODE_CLASS (code) != tcc_vl_exp);
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va_start (p, code);
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ret = make_node (code);
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TREE_TYPE (ret) = void_type_node;
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length = TREE_CODE_LENGTH (code);
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SET_EXPR_LOCATION (ret, input_location);
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/* TREE_SIDE_EFFECTS will already be set for statements with
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implicit side effects. Here we make sure it is set for other
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expressions by checking whether the parameters have side
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effects. */
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side_effects = false;
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for (i = 0; i < length; i++)
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{
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tree t = va_arg (p, tree);
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if (t && !TYPE_P (t))
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side_effects |= TREE_SIDE_EFFECTS (t);
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TREE_OPERAND (ret, i) = t;
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}
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TREE_SIDE_EFFECTS (ret) |= side_effects;
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va_end (p);
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return ret;
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}
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/* Let the back-end know about DECL. */
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void
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emit_local_var (tree decl)
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{
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/* Create RTL for this variable. */
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if (!DECL_RTL_SET_P (decl))
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{
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if (DECL_HARD_REGISTER (decl))
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/* The user specified an assembler name for this variable.
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Set that up now. */
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rest_of_decl_compilation (decl, 0, 0);
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else
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expand_decl (decl);
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}
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}
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/* Create a CASE_LABEL_EXPR tree node and return it. */
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tree
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build_case_label (tree low_value, tree high_value, tree label_decl)
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{
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return build_stmt (CASE_LABEL_EXPR, low_value, high_value, label_decl);
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}
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