gcc/gimple-builder.c

   1 /* Functions for high level gimple building routines.
   2    Copyright (C) 2013-2015 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 "alias.h"
  24 #include "symtab.h"
  25 #include "options.h"
  26 #include "tree.h"
  27 #include "fold-const.h"
  28 #include "stringpool.h"
  29 #include "predict.h"
  30 #include "tm.h"
  31 #include "hard-reg-set.h"
  32 #include "function.h"
  33 #include "basic-block.h"
  34 #include "tree-ssa-alias.h"
  35 #include "internal-fn.h"
  36 #include "gimple-expr.h"
  37 #include "gimple.h"
  38 #include "tree-ssanames.h"
  39
  40
  41 /* Return the expression type to use based on the CODE and type of
  42    the given operand OP.  If the expression CODE is a comparison,
  43    the returned type is boolean_type_node.  Otherwise, it returns
  44    the type of OP.  */
  45
  46 static tree
  47 get_expr_type (enum tree_code code, tree op)
  48 {
  49   return (TREE_CODE_CLASS (code) == tcc_comparison)
  50          ? boolean_type_node
  51          : TREE_TYPE (op);
  52 }
  53
  54
  55 /* Build a new gimple assignment.  The LHS of the assignment is a new
  56    temporary whose type matches the given expression.  MODE indicates
  57    whether the LHS should be an SSA or a normal temporary.  CODE is
  58    the expression code for the RHS.  OP1 is the first operand and VAL
  59    is an integer value to be used as the second operand.  */
  60
  61 gassign *
  62 build_assign (enum tree_code code, tree op1, int val, tree lhs)
  63 {
  64   tree op2 = build_int_cst (TREE_TYPE (op1), val);
  65   if (lhs == NULL_TREE)
  66     lhs = make_ssa_name (get_expr_type (code, op1));
  67   return gimple_build_assign (lhs, code, op1, op2);
  68 }
  69
  70 gassign *
  71 build_assign (enum tree_code code, gimple g, int val, tree lhs )
  72 {
  73   return build_assign (code, gimple_assign_lhs (g), val, lhs);
  74 }
  75
  76
  77 /* Build and return a new GIMPLE assignment.  The new assignment will
  78    have the opcode CODE and operands OP1 and OP2.  The type of the
  79    expression on the RHS is inferred to be the type of OP1.
  80
  81    The LHS of the statement will be an SSA name or a GIMPLE temporary
  82    in normal form depending on the type of builder invoking this
  83    function.  */
  84
  85 gassign *
  86 build_assign (enum tree_code code, tree op1, tree op2, tree lhs)
  87 {
  88   if (lhs == NULL_TREE)
  89     lhs = make_ssa_name (get_expr_type (code, op1));
  90   return gimple_build_assign (lhs, code, op1, op2);
  91 }
  92
  93 gassign *
  94 build_assign (enum tree_code code, gimple op1, tree op2, tree lhs)
  95 {
  96   return build_assign (code, gimple_assign_lhs (op1), op2, lhs);
  97 }
  98
  99 gassign *
 100 build_assign (enum tree_code code, tree op1, gimple op2, tree lhs)
 101 {
 102   return build_assign (code, op1, gimple_assign_lhs (op2), lhs);
 103 }
 104
 105 gassign *
 106 build_assign (enum tree_code code, gimple op1, gimple op2, tree lhs)
 107 {
 108   return build_assign (code, gimple_assign_lhs (op1), gimple_assign_lhs (op2),
 109                        lhs);
 110 }
 111
 112
 113 /* Create and return a type cast assignment. This creates a NOP_EXPR
 114    that converts OP to TO_TYPE.  */
 115
 116 gassign *
 117 build_type_cast (tree to_type, tree op, tree lhs)
 118 {
 119   if (lhs == NULL_TREE)
 120     lhs = make_ssa_name (to_type);
 121   return gimple_build_assign (lhs, NOP_EXPR, op);
 122 }
 123
 124 gassign *
 125 build_type_cast (tree to_type, gimple op, tree lhs)
 126 {
 127   return build_type_cast (to_type, gimple_assign_lhs (op), lhs);
 128 }
 129
 130
 131