gcc/tree-gimple.h

   1 /* Functions to analyze and validate GIMPLE trees.
   2    Copyright (C) 2002, 2003, 2005, 2007 Free Software Foundation, Inc.
   3    Contributed by Diego Novillo <dnovillo@redhat.com>
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 3, or (at your option)
  10 any later version.
  11
  12 GCC is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _TREE_SIMPLE_H
  22 #define _TREE_SIMPLE_H 1
  23
  24
  25 #include "tree-iterator.h"
  26
  27 extern tree create_tmp_var_raw (tree, const char *);
  28 extern tree create_tmp_var_name (const char *);
  29 extern tree create_tmp_var (tree, const char *);
  30 extern tree get_initialized_tmp_var (tree, tree *, tree *);
  31 extern tree get_formal_tmp_var (tree, tree *);
  32
  33 extern void declare_vars (tree, tree, bool);
  34
  35 extern void annotate_all_with_locus (tree *, location_t);
  36
  37 /* Validation of GIMPLE expressions.  Note that these predicates only check
  38    the basic form of the expression, they don't recurse to make sure that
  39    underlying nodes are also of the right form.  */
  40
  41 typedef bool (*gimple_predicate)(tree);
  42
  43 /* Returns true iff T is a valid GIMPLE statement.  */
  44 extern bool is_gimple_stmt (tree);
  45
  46 /* Returns true iff TYPE is a valid type for a scalar register variable.  */
  47 extern bool is_gimple_reg_type (tree);
  48 /* Returns true iff T is a scalar register variable.  */
  49 extern bool is_gimple_reg (tree);
  50 /* Returns true if T is a GIMPLE temporary variable, false otherwise.  */
  51 extern bool is_gimple_formal_tmp_var (tree);
  52 /* Returns true if T is a GIMPLE temporary register variable.  */
  53 extern bool is_gimple_formal_tmp_reg (tree);
  54 /* Returns true iff T is any sort of variable.  */
  55 extern bool is_gimple_variable (tree);
  56 /* Returns true iff T is any sort of symbol.  */
  57 extern bool is_gimple_id (tree);
  58 /* Returns true iff T is a variable or an INDIRECT_REF (of a variable).  */
  59 extern bool is_gimple_min_lval (tree);
  60 /* Returns true iff T is something whose address can be taken.  */
  61 extern bool is_gimple_addressable (tree);
  62 /* Returns true iff T is any valid GIMPLE lvalue.  */
  63 extern bool is_gimple_lvalue (tree);
  64
  65 /* Returns true iff T is a GIMPLE address.  */
  66 bool is_gimple_address (const_tree);
  67 /* Returns true iff T is a GIMPLE invariant address.  */
  68 bool is_gimple_invariant_address (const_tree);
  69 /* Returns true iff T is a valid GIMPLE constant.  */
  70 bool is_gimple_constant (const_tree);
  71 /* Returns true iff T is a GIMPLE restricted function invariant.  */
  72 extern bool is_gimple_min_invariant (const_tree);
  73 /* Returns true iff T is a GIMPLE rvalue.  */
  74 extern bool is_gimple_val (tree);
  75 /* Returns true iff T is a GIMPLE asm statement input.  */
  76 extern bool is_gimple_asm_val (tree);
  77 /* Returns true iff T is a valid rhs for a MODIFY_EXPR where the LHS is a
  78    GIMPLE temporary, a renamed user variable, or something else,
  79    respectively.  */
  80 extern bool is_gimple_formal_tmp_rhs (tree);
  81 extern bool is_gimple_reg_rhs (tree);
  82 extern bool is_gimple_mem_rhs (tree);
  83 /* Returns the appropriate one of the above three predicates for the LHS
  84    T.  */
  85 extern gimple_predicate rhs_predicate_for (tree);
  86
  87 /* Returns true iff T is a valid if-statement condition.  */
  88 extern bool is_gimple_condexpr (tree);
  89
  90 /* Returns true iff T is a type conversion.  */
  91 extern bool is_gimple_cast (tree);
  92 /* Returns true iff T is a variable that does not need to live in memory.  */
  93 extern bool is_gimple_non_addressable (tree t);
  94
  95 /* Returns true iff T is a valid call address expression.  */
  96 extern bool is_gimple_call_addr (tree);
  97 /* If T makes a function call, returns the CALL_EXPR operand.  */
  98 extern tree get_call_expr_in (tree t);
  99
 100 extern void recalculate_side_effects (tree);
 101
 102 /* FIXME we should deduce this from the predicate.  */
 103 typedef enum fallback_t {
 104   fb_none = 0,
 105   fb_rvalue = 1,
 106   fb_lvalue = 2,
 107   fb_mayfail = 4,
 108   fb_either= fb_rvalue | fb_lvalue
 109 } fallback_t;
 110
 111 enum gimplify_status {
 112   GS_ERROR      = -2,   /* Something Bad Seen.  */
 113   GS_UNHANDLED  = -1,   /* A langhook result for "I dunno".  */
 114   GS_OK         = 0,    /* We did something, maybe more to do.  */
 115   GS_ALL_DONE   = 1     /* The expression is fully gimplified.  */
 116 };
 117
 118 extern enum gimplify_status gimplify_expr (tree *, tree *, tree *,
 119                                            bool (*) (tree), fallback_t);
 120 extern void gimplify_type_sizes (tree, tree *);
 121 extern void gimplify_one_sizepos (tree *, tree *);
 122 extern void gimplify_stmt (tree *);
 123 extern void gimplify_to_stmt_list (tree *);
 124 extern void gimplify_body (tree *, tree, bool);
 125 extern void push_gimplify_context (void);
 126 extern void pop_gimplify_context (tree);
 127 extern void gimplify_and_add (tree, tree *);
 128
 129 /* Miscellaneous helpers.  */
 130 extern void gimple_add_tmp_var (tree);
 131 extern tree gimple_current_bind_expr (void);
 132 extern tree voidify_wrapper_expr (tree, tree);
 133 extern tree gimple_build_eh_filter (tree, tree, tree);
 134 extern tree build_and_jump (tree *);
 135 extern tree alloc_stmt_list (void);
 136 extern void free_stmt_list (tree);
 137 extern tree force_labels_r (tree *, int *, void *);
 138 extern enum gimplify_status gimplify_va_arg_expr (tree *, tree *, tree *);
 139 struct gimplify_omp_ctx;
 140 extern void omp_firstprivatize_variable (struct gimplify_omp_ctx *, tree);
 141 extern tree gimple_boolify (tree);
 142 extern tree canonicalize_cond_expr_cond (tree);
 143
 144 /* In omp-low.c.  */
 145 extern void diagnose_omp_structured_block_errors (tree);
 146 extern tree omp_reduction_init (tree, tree);
 147
 148 /* In tree-nested.c.  */
 149 extern void lower_nested_functions (tree);
 150 extern void insert_field_into_struct (tree, tree);
 151
 152 /* Convenience routines to walk all statements of a gimple function.
 153    The difference between these walkers and the generic walk_tree is
 154    that walk_stmt provides context information to the callback
 155    routine to know whether it is currently on the LHS or RHS of an
 156    assignment (IS_LHS) or contexts where only GIMPLE values are
 157    allowed (VAL_ONLY).
 158
 159    This is useful in walkers that need to re-write sub-expressions
 160    inside statements while making sure the result is still in GIMPLE
 161    form.
 162
 163    Note that this is useful exclusively before the code is converted
 164    into SSA form.  Once the program is in SSA form, the standard
 165    operand interface should be used to analyze/modify statements.  */
 166
 167 struct walk_stmt_info
 168 {
 169   /* For each statement, we invoke CALLBACK via walk_tree.  The passed
 170      data is a walk_stmt_info structure.  */
 171   walk_tree_fn callback;
 172
 173   /* Points to the current statement being walked.  */
 174   tree_stmt_iterator tsi;
 175
 176   /* Additional data that CALLBACK may want to carry through the
 177      recursion.  */
 178   void *info;
 179
 180   /* Indicates whether the *TP being examined may be replaced
 181      with something that matches is_gimple_val (if true) or something
 182      slightly more complicated (if false).  "Something" technically
 183      means the common subset of is_gimple_lvalue and is_gimple_rhs,
 184      but we never try to form anything more complicated than that, so
 185      we don't bother checking.
 186
 187      Also note that CALLBACK should update this flag while walking the
 188      sub-expressions of a statement.  For instance, when walking the
 189      statement 'foo (&var)', the flag VAL_ONLY will initially be set
 190      to true, however, when walking &var, the operand of that
 191      ADDR_EXPR does not need to be a GIMPLE value.  */
 192   bool val_only;
 193
 194   /* True if we are currently walking the LHS of an assignment.  */
 195   bool is_lhs;
 196
 197   /* Optional.  Set to true by CALLBACK if it made any changes.  */
 198   bool changed;
 199
 200   /* True if we're interested in seeing BIND_EXPRs.  */
 201   bool want_bind_expr;
 202
 203   /* True if we're interested in seeing RETURN_EXPRs.  */
 204   bool want_return_expr;
 205
 206   /* True if we're interested in location information.  */
 207   bool want_locations;
 208 };
 209
 210 void walk_stmts (struct walk_stmt_info *, tree *);
 211
 212 #endif /* _TREE_SIMPLE_H  */