gcc/gimple-builder.c

   1 /* Functions for high level gimple building routines.
   2    Copyright (C) 2013-2018 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 "backend.h"
  24 #include "tree.h"
  25 #include "gimple.h"
  26 #include "stringpool.h"
  27 #include "tree-vrp.h"
  28 #include "tree-ssanames.h"
  29
  30
  31 /* Return the expression type to use based on the CODE and type of
  32    the given operand OP.  If the expression CODE is a comparison,
  33    the returned type is boolean_type_node.  Otherwise, it returns
  34    the type of OP.  */
  35
  36 static tree
  37 get_expr_type (enum tree_code code, tree op)
  38 {
  39   return (TREE_CODE_CLASS (code) == tcc_comparison)
  40          ? boolean_type_node
  41          : TREE_TYPE (op);
  42 }
  43
  44
  45 /* Build a new gimple assignment.  The LHS of the assignment is a new
  46    temporary whose type matches the given expression.  MODE indicates
  47    whether the LHS should be an SSA or a normal temporary.  CODE is
  48    the expression code for the RHS.  OP1 is the first operand and VAL
  49    is an integer value to be used as the second operand.  */
  50
  51 gassign *
  52 build_assign (enum tree_code code, tree op1, int val, tree lhs)
  53 {
  54   tree op2 = build_int_cst (TREE_TYPE (op1), val);
  55   if (lhs == NULL_TREE)
  56     lhs = make_ssa_name (get_expr_type (code, op1));
  57   return gimple_build_assign (lhs, code, op1, op2);
  58 }
  59
  60 gassign *
  61 build_assign (enum tree_code code, gimple *g, int val, tree lhs )
  62 {
  63   return build_assign (code, gimple_assign_lhs (g), val, lhs);
  64 }
  65
  66
  67 /* Build and return a new GIMPLE assignment.  The new assignment will
  68    have the opcode CODE and operands OP1 and OP2.  The type of the
  69    expression on the RHS is inferred to be the type of OP1.
  70
  71    The LHS of the statement will be an SSA name or a GIMPLE temporary
  72    in normal form depending on the type of builder invoking this
  73    function.  */
  74
  75 gassign *
  76 build_assign (enum tree_code code, tree op1, tree op2, tree lhs)
  77 {
  78   if (lhs == NULL_TREE)
  79     lhs = make_ssa_name (get_expr_type (code, op1));
  80   return gimple_build_assign (lhs, code, op1, op2);
  81 }
  82
  83 gassign *
  84 build_assign (enum tree_code code, gimple *op1, tree op2, tree lhs)
  85 {
  86   return build_assign (code, gimple_assign_lhs (op1), op2, lhs);
  87 }
  88
  89 gassign *
  90 build_assign (enum tree_code code, tree op1, gimple *op2, tree lhs)
  91 {
  92   return build_assign (code, op1, gimple_assign_lhs (op2), lhs);
  93 }
  94
  95 gassign *
  96 build_assign (enum tree_code code, gimple *op1, gimple *op2, tree lhs)
  97 {
  98   return build_assign (code, gimple_assign_lhs (op1), gimple_assign_lhs (op2),
  99                        lhs);
 100 }
 101
 102
 103 /* Create and return a type cast assignment. This creates a NOP_EXPR
 104    that converts OP to TO_TYPE.  */
 105
 106 gassign *
 107 build_type_cast (tree to_type, tree op, tree lhs)
 108 {
 109   if (lhs == NULL_TREE)
 110     lhs = make_ssa_name (to_type);
 111   return gimple_build_assign (lhs, NOP_EXPR, op);
 112 }
 113
 114 gassign *
 115 build_type_cast (tree to_type, gimple *op, tree lhs)
 116 {
 117   return build_type_cast (to_type, gimple_assign_lhs (op), lhs);
 118 }
 119
 120
 121