gimple-builder.c revision 1.1.1.2 
1/* Functions for high level gimple building routines.
2   Copyright (C) 2013-2016 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify
7it under the terms of the GNU General Public License as published by
8the Free Software Foundation; either version 3, or (at your option)
9any later version.
10
11GCC is distributed in the hope that it will be useful,
12but WITHOUT ANY WARRANTY; without even the implied warranty of
13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14GNU General Public License for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20#include "config.h"
21#include "system.h"
22#include "coretypes.h"
23#include "backend.h"
24#include "tree.h"
25#include "gimple.h"
26#include "stringpool.h"
27#include "tree-ssanames.h"
28
29
30/* Return the expression type to use based on the CODE and type of
31   the given operand OP.  If the expression CODE is a comparison,
32   the returned type is boolean_type_node.  Otherwise, it returns
33   the type of OP.  */
34
35static tree
36get_expr_type (enum tree_code code, tree op)
37{
38  return (TREE_CODE_CLASS (code) == tcc_comparison)
39	 ? boolean_type_node
40	 : TREE_TYPE (op);
41}
42
43
44/* Build a new gimple assignment.  The LHS of the assignment is a new
45   temporary whose type matches the given expression.  MODE indicates
46   whether the LHS should be an SSA or a normal temporary.  CODE is
47   the expression code for the RHS.  OP1 is the first operand and VAL
48   is an integer value to be used as the second operand.  */
49
50gassign *
51build_assign (enum tree_code code, tree op1, int val, tree lhs)
52{
53  tree op2 = build_int_cst (TREE_TYPE (op1), val);
54  if (lhs == NULL_TREE)
55    lhs = make_ssa_name (get_expr_type (code, op1));
56  return gimple_build_assign (lhs, code, op1, op2);
57}
58
59gassign *
60build_assign (enum tree_code code, gimple *g, int val, tree lhs )
61{
62  return build_assign (code, gimple_assign_lhs (g), val, lhs);
63}
64
65
66/* Build and return a new GIMPLE assignment.  The new assignment will
67   have the opcode CODE and operands OP1 and OP2.  The type of the
68   expression on the RHS is inferred to be the type of OP1.
69
70   The LHS of the statement will be an SSA name or a GIMPLE temporary
71   in normal form depending on the type of builder invoking this
72   function.  */
73
74gassign *
75build_assign (enum tree_code code, tree op1, tree op2, tree lhs)
76{
77  if (lhs == NULL_TREE)
78    lhs = make_ssa_name (get_expr_type (code, op1));
79  return gimple_build_assign (lhs, code, op1, op2);
80}
81
82gassign *
83build_assign (enum tree_code code, gimple *op1, tree op2, tree lhs)
84{
85  return build_assign (code, gimple_assign_lhs (op1), op2, lhs);
86}
87
88gassign *
89build_assign (enum tree_code code, tree op1, gimple *op2, tree lhs)
90{
91  return build_assign (code, op1, gimple_assign_lhs (op2), lhs);
92}
93
94gassign *
95build_assign (enum tree_code code, gimple *op1, gimple *op2, tree lhs)
96{
97  return build_assign (code, gimple_assign_lhs (op1), gimple_assign_lhs (op2),
98                       lhs);
99}
100
101
102/* Create and return a type cast assignment. This creates a NOP_EXPR
103   that converts OP to TO_TYPE.  */
104
105gassign *
106build_type_cast (tree to_type, tree op, tree lhs)
107{
108  if (lhs == NULL_TREE)
109    lhs = make_ssa_name (to_type);
110  return gimple_build_assign (lhs, NOP_EXPR, op);
111}
112
113gassign *
114build_type_cast (tree to_type, gimple *op, tree lhs)
115{
116  return build_type_cast (to_type, gimple_assign_lhs (op), lhs);
117}
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121