annotate gcc/gimple-builder.c @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
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children 84e7813d76e9
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16
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1 /* Functions for high level gimple building routines.
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2 Copyright (C) 2013-2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "backend.h"
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24 #include "tree.h"
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25 #include "gimple.h"
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26 #include "stringpool.h"
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27 #include "tree-vrp.h"
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28 #include "tree-ssanames.h"
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29
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30
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31 /* Return the expression type to use based on the CODE and type of
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32 the given operand OP. If the expression CODE is a comparison,
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33 the returned type is boolean_type_node. Otherwise, it returns
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34 the type of OP. */
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35
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36 static tree
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37 get_expr_type (enum tree_code code, tree op)
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38 {
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39 return (TREE_CODE_CLASS (code) == tcc_comparison)
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40 ? boolean_type_node
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41 : TREE_TYPE (op);
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42 }
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43
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44
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45 /* Build a new gimple assignment. The LHS of the assignment is a new
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46 temporary whose type matches the given expression. MODE indicates
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47 whether the LHS should be an SSA or a normal temporary. CODE is
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48 the expression code for the RHS. OP1 is the first operand and VAL
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49 is an integer value to be used as the second operand. */
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50
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51 gassign *
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52 build_assign (enum tree_code code, tree op1, int val, tree lhs)
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53 {
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54 tree op2 = build_int_cst (TREE_TYPE (op1), val);
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55 if (lhs == NULL_TREE)
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56 lhs = make_ssa_name (get_expr_type (code, op1));
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57 return gimple_build_assign (lhs, code, op1, op2);
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58 }
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59
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60 gassign *
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61 build_assign (enum tree_code code, gimple *g, int val, tree lhs )
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62 {
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63 return build_assign (code, gimple_assign_lhs (g), val, lhs);
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64 }
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65
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66
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67 /* Build and return a new GIMPLE assignment. The new assignment will
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68 have the opcode CODE and operands OP1 and OP2. The type of the
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69 expression on the RHS is inferred to be the type of OP1.
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70
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71 The LHS of the statement will be an SSA name or a GIMPLE temporary
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72 in normal form depending on the type of builder invoking this
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73 function. */
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74
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75 gassign *
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76 build_assign (enum tree_code code, tree op1, tree op2, tree lhs)
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77 {
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78 if (lhs == NULL_TREE)
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79 lhs = make_ssa_name (get_expr_type (code, op1));
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80 return gimple_build_assign (lhs, code, op1, op2);
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81 }
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82
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83 gassign *
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84 build_assign (enum tree_code code, gimple *op1, tree op2, tree lhs)
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85 {
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86 return build_assign (code, gimple_assign_lhs (op1), op2, lhs);
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87 }
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88
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89 gassign *
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90 build_assign (enum tree_code code, tree op1, gimple *op2, tree lhs)
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91 {
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92 return build_assign (code, op1, gimple_assign_lhs (op2), lhs);
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93 }
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94
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95 gassign *
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96 build_assign (enum tree_code code, gimple *op1, gimple *op2, tree lhs)
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97 {
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98 return build_assign (code, gimple_assign_lhs (op1), gimple_assign_lhs (op2),
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99 lhs);
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100 }
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101
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102
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103 /* Create and return a type cast assignment. This creates a NOP_EXPR
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104 that converts OP to TO_TYPE. */
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105
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106 gassign *
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107 build_type_cast (tree to_type, tree op, tree lhs)
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108 {
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109 if (lhs == NULL_TREE)
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110 lhs = make_ssa_name (to_type);
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111 return gimple_build_assign (lhs, NOP_EXPR, op);
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112 }
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113
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114 gassign *
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115 build_type_cast (tree to_type, gimple *op, tree lhs)
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116 {
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117 return build_type_cast (to_type, gimple_assign_lhs (op), lhs);
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118 }
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119
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120
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121