gcc/gimple-expr.h

   1 /* Header file for gimple decl, type and expressions.
   2    Copyright (C) 2013 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 it under
   7 the terms of the GNU General Public License as published by the Free
   8 Software Foundation; either version 3, or (at your option) any later
   9 version.
  10
  11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  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 #ifndef GCC_GIMPLE_EXPR_H
  21 #define GCC_GIMPLE_EXPR_H
  22
  23 extern bool useless_type_conversion_p (tree, tree);
  24
  25 extern void gimple_set_body (tree, gimple_seq);
  26 extern gimple_seq gimple_body (tree);
  27 extern bool gimple_has_body_p (tree);
  28 extern const char *gimple_decl_printable_name (tree, int);
  29 extern tree copy_var_decl (tree, tree, tree);
  30 extern bool gimple_can_coalesce_p (tree, tree);
  31
  32 extern void extract_ops_from_tree_1 (tree, enum tree_code *, tree *, tree *,
  33                                      tree *);
  34 extern void gimple_cond_get_ops_from_tree (tree, enum tree_code *, tree *,
  35                                            tree *);
  36 extern bool is_gimple_lvalue (tree);
  37 extern bool is_gimple_condexpr (tree);
  38 extern bool is_gimple_address (const_tree);
  39 extern bool is_gimple_invariant_address (const_tree);
  40 extern bool is_gimple_ip_invariant_address (const_tree);
  41 extern bool is_gimple_min_invariant (const_tree);
  42 extern bool is_gimple_ip_invariant (const_tree);
  43 extern bool is_gimple_reg (tree);
  44 extern bool is_gimple_val (tree);
  45 extern bool is_gimple_asm_val (tree);
  46 extern bool is_gimple_min_lval (tree);
  47 extern bool is_gimple_call_addr (tree);
  48 extern bool is_gimple_mem_ref_addr (tree);
  49
  50 /* Return true if a conversion from either type of TYPE1 and TYPE2
  51    to the other is not required.  Otherwise return false.  */
  52
  53 static inline bool
  54 types_compatible_p (tree type1, tree type2)
  55 {
  56   return (type1 == type2
  57           || (useless_type_conversion_p (type1, type2)
  58               && useless_type_conversion_p (type2, type1)));
  59 }
  60
  61 /* Return true if TYPE is a suitable type for a scalar register variable.  */
  62
  63 static inline bool
  64 is_gimple_reg_type (tree type)
  65 {
  66   return !AGGREGATE_TYPE_P (type);
  67 }
  68
  69 /* Return true if T is a variable.  */
  70
  71 static inline bool
  72 is_gimple_variable (tree t)
  73 {
  74   return (TREE_CODE (t) == VAR_DECL
  75           || TREE_CODE (t) == PARM_DECL
  76           || TREE_CODE (t) == RESULT_DECL
  77           || TREE_CODE (t) == SSA_NAME);
  78 }
  79
  80 /*  Return true if T is a GIMPLE identifier (something with an address).  */
  81
  82 static inline bool
  83 is_gimple_id (tree t)
  84 {
  85   return (is_gimple_variable (t)
  86           || TREE_CODE (t) == FUNCTION_DECL
  87           || TREE_CODE (t) == LABEL_DECL
  88           || TREE_CODE (t) == CONST_DECL
  89           /* Allow string constants, since they are addressable.  */
  90           || TREE_CODE (t) == STRING_CST);
  91 }
  92
  93 /* Return true if OP, an SSA name or a DECL is a virtual operand.  */
  94
  95 static inline bool
  96 virtual_operand_p (tree op)
  97 {
  98   if (TREE_CODE (op) == SSA_NAME)
  99     {
 100       op = SSA_NAME_VAR (op);
 101       if (!op)
 102         return false;
 103     }
 104
 105   if (TREE_CODE (op) == VAR_DECL)
 106     return VAR_DECL_IS_VIRTUAL_OPERAND (op);
 107
 108   return false;
 109 }
 110
 111 /*  Return true if T is something whose address can be taken.  */
 112
 113 static inline bool
 114 is_gimple_addressable (tree t)
 115 {
 116   return (is_gimple_id (t) || handled_component_p (t)
 117           || TREE_CODE (t) == MEM_REF);
 118 }
 119
 120 /* Return true if T is a valid gimple constant.  */
 121
 122 static inline bool
 123 is_gimple_constant (const_tree t)
 124 {
 125   switch (TREE_CODE (t))
 126     {
 127     case INTEGER_CST:
 128     case REAL_CST:
 129     case FIXED_CST:
 130     case STRING_CST:
 131     case COMPLEX_CST:
 132     case VECTOR_CST:
 133       return true;
 134
 135     default:
 136       return false;
 137     }
 138 }
 139
 140 /* A wrapper around extract_ops_from_tree_1, for callers which expect
 141    to see only a maximum of two operands.  */
 142
 143 static inline void
 144 extract_ops_from_tree (tree expr, enum tree_code *code, tree *op0,
 145                        tree *op1)
 146 {
 147   tree op2;
 148   extract_ops_from_tree_1 (expr, code, op0, op1, &op2);
 149   gcc_assert (op2 == NULL_TREE);
 150 }
 151
 152 /* Given a valid GIMPLE_CALL function address return the FUNCTION_DECL
 153    associated with the callee if known.  Otherwise return NULL_TREE.  */
 154
 155 static inline tree
 156 gimple_call_addr_fndecl (const_tree fn)
 157 {
 158   if (fn && TREE_CODE (fn) == ADDR_EXPR)
 159     {
 160       tree fndecl = TREE_OPERAND (fn, 0);
 161       if (TREE_CODE (fndecl) == MEM_REF
 162           && TREE_CODE (TREE_OPERAND (fndecl, 0)) == ADDR_EXPR
 163           && integer_zerop (TREE_OPERAND (fndecl, 1)))
 164         fndecl = TREE_OPERAND (TREE_OPERAND (fndecl, 0), 0);
 165       if (TREE_CODE (fndecl) == FUNCTION_DECL)
 166         return fndecl;
 167     }
 168   return NULL_TREE;
 169 }
 170
 171 #endif /* GCC_GIMPLE_EXPR_H */