gcc/gimple-builder.c

   1 /* Functions for high level gimple building routines.
   2    Copyright (C) 2013-2014 Free Software Foundation, Inc.
   3
   4 This file is part of GCC.
   5
   6 GCC is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 3, or (at your option)
   9 any later version.
  10
  11 GCC is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along 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 "tree.h"
  24 #include "stringpool.h"
  25 #include "basic-block.h"
  26 #include "tree-ssa-alias.h"
  27 #include "internal-fn.h"
  28 #include "gimple-expr.h"
  29 #include "is-a.h"
  30 #include "gimple.h"
  31 #include "tree-ssanames.h"
  32
  33
  34 /* Return the expression type to use based on the CODE and type of
  35    the given operand OP.  If the expression CODE is a comparison,
  36    the returned type is boolean_type_node.  Otherwise, it returns
  37    the type of OP.  */
  38
  39 static tree
  40 get_expr_type (enum tree_code code, tree op)
  41 {
  42   return (TREE_CODE_CLASS (code) == tcc_comparison)
  43          ? boolean_type_node
  44          : TREE_TYPE (op);
  45 }
  46
  47
  48 /* Build a new gimple assignment.  The LHS of the assignment is a new
  49    temporary whose type matches the given expression.  MODE indicates
  50    whether the LHS should be an SSA or a normal temporary.  CODE is
  51    the expression code for the RHS.  OP1 is the first operand and VAL
  52    is an integer value to be used as the second operand.  */
  53
  54 gimple
  55 build_assign (enum tree_code code, tree op1, int val, tree lhs)
  56 {
  57   tree op2 = build_int_cst (TREE_TYPE (op1), val);
  58   if (lhs == NULL_TREE)
  59     lhs = make_ssa_name (get_expr_type (code, op1), NULL);
  60   return gimple_build_assign_with_ops (code, lhs, op1, op2);
  61 }
  62
  63 gimple
  64 build_assign (enum tree_code code, gimple g, int val, tree lhs )
  65 {
  66   return build_assign (code, gimple_assign_lhs (g), val, lhs);
  67 }
  68
  69
  70 /* Build and return a new GIMPLE assignment.  The new assignment will
  71    have the opcode CODE and operands OP1 and OP2.  The type of the
  72    expression on the RHS is inferred to be the type of OP1.
  73
  74    The LHS of the statement will be an SSA name or a GIMPLE temporary
  75    in normal form depending on the type of builder invoking this
  76    function.  */
  77
  78 gimple
  79 build_assign (enum tree_code code, tree op1, tree op2, tree lhs)
  80 {
  81   if (lhs == NULL_TREE)
  82     lhs = make_ssa_name (get_expr_type (code, op1), NULL);
  83   return gimple_build_assign_with_ops (code, lhs, op1, op2);
  84 }
  85
  86 gimple
  87 build_assign (enum tree_code code, gimple op1, tree op2, tree lhs)
  88 {
  89   return build_assign (code, gimple_assign_lhs (op1), op2, lhs);
  90 }
  91
  92 gimple
  93 build_assign (enum tree_code code, tree op1, gimple op2, tree lhs)
  94 {
  95   return build_assign (code, op1, gimple_assign_lhs (op2), lhs);
  96 }
  97
  98 gimple
  99 build_assign (enum tree_code code, gimple op1, gimple op2, tree lhs)
 100 {
 101   return build_assign (code, gimple_assign_lhs (op1), gimple_assign_lhs (op2),
 102                        lhs);
 103 }
 104
 105
 106 /* Create and return a type cast assignment. This creates a NOP_EXPR
 107    that converts OP to TO_TYPE.  */
 108
 109 gimple
 110 build_type_cast (tree to_type, tree op, tree lhs)
 111 {
 112   if (lhs == NULL_TREE)
 113     lhs = make_ssa_name (to_type, NULL);
 114   return gimple_build_assign_with_ops (NOP_EXPR, lhs, op, NULL_TREE);
 115 }
 116
 117 gimple
 118 build_type_cast (tree to_type, gimple op, tree lhs)
 119 {
 120   return build_type_cast (to_type, gimple_assign_lhs (op), lhs);
 121 }
 122
 123
 124