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 "hash-set.h"
  24 #include "machmode.h"
  25 #include "vec.h"
  26 #include "double-int.h"
  27 #include "input.h"
  28 #include "alias.h"
  29 #include "symtab.h"
  30 #include "options.h"
  31 #include "wide-int.h"
  32 #include "inchash.h"
  33 #include "tree.h"
  34 #include "fold-const.h"
  35 #include "stringpool.h"
  36 #include "predict.h"
  37 #include "tm.h"
  38 #include "hard-reg-set.h"
  39 #include "input.h"
  40 #include "function.h"
  41 #include "basic-block.h"
  42 #include "tree-ssa-alias.h"
  43 #include "internal-fn.h"
  44 #include "gimple-expr.h"
  45 #include "is-a.h"
  46 #include "gimple.h"
  47 #include "tree-ssanames.h"
  48
  49
  50 /* Return the expression type to use based on the CODE and type of
  51    the given operand OP.  If the expression CODE is a comparison,
  52    the returned type is boolean_type_node.  Otherwise, it returns
  53    the type of OP.  */
  54
  55 static tree
  56 get_expr_type (enum tree_code code, tree op)
  57 {
  58   return (TREE_CODE_CLASS (code) == tcc_comparison)
  59          ? boolean_type_node
  60          : TREE_TYPE (op);
  61 }
  62
  63
  64 /* Build a new gimple assignment.  The LHS of the assignment is a new
  65    temporary whose type matches the given expression.  MODE indicates
  66    whether the LHS should be an SSA or a normal temporary.  CODE is
  67    the expression code for the RHS.  OP1 is the first operand and VAL
  68    is an integer value to be used as the second operand.  */
  69
  70 gassign *
  71 build_assign (enum tree_code code, tree op1, int val, tree lhs)
  72 {
  73   tree op2 = build_int_cst (TREE_TYPE (op1), val);
  74   if (lhs == NULL_TREE)
  75     lhs = make_ssa_name (get_expr_type (code, op1));
  76   return gimple_build_assign (lhs, code, op1, op2);
  77 }
  78
  79 gassign *
  80 build_assign (enum tree_code code, gimple g, int val, tree lhs )
  81 {
  82   return build_assign (code, gimple_assign_lhs (g), val, lhs);
  83 }
  84
  85
  86 /* Build and return a new GIMPLE assignment.  The new assignment will
  87    have the opcode CODE and operands OP1 and OP2.  The type of the
  88    expression on the RHS is inferred to be the type of OP1.
  89
  90    The LHS of the statement will be an SSA name or a GIMPLE temporary
  91    in normal form depending on the type of builder invoking this
  92    function.  */
  93
  94 gassign *
  95 build_assign (enum tree_code code, tree op1, tree op2, tree lhs)
  96 {
  97   if (lhs == NULL_TREE)
  98     lhs = make_ssa_name (get_expr_type (code, op1));
  99   return gimple_build_assign (lhs, code, op1, op2);
 100 }
 101
 102 gassign *
 103 build_assign (enum tree_code code, gimple op1, tree op2, tree lhs)
 104 {
 105   return build_assign (code, gimple_assign_lhs (op1), op2, lhs);
 106 }
 107
 108 gassign *
 109 build_assign (enum tree_code code, tree op1, gimple op2, tree lhs)
 110 {
 111   return build_assign (code, op1, gimple_assign_lhs (op2), lhs);
 112 }
 113
 114 gassign *
 115 build_assign (enum tree_code code, gimple op1, gimple op2, tree lhs)
 116 {
 117   return build_assign (code, gimple_assign_lhs (op1), gimple_assign_lhs (op2),
 118                        lhs);
 119 }
 120
 121
 122 /* Create and return a type cast assignment. This creates a NOP_EXPR
 123    that converts OP to TO_TYPE.  */
 124
 125 gassign *
 126 build_type_cast (tree to_type, tree op, tree lhs)
 127 {
 128   if (lhs == NULL_TREE)
 129     lhs = make_ssa_name (to_type);
 130   return gimple_build_assign (lhs, NOP_EXPR, op);
 131 }
 132
 133 gassign *
 134 build_type_cast (tree to_type, gimple op, tree lhs)
 135 {
 136   return build_type_cast (to_type, gimple_assign_lhs (op), lhs);
 137 }
 138
 139
 140