gdb/compile/compile-cplus.h

   1 /* Header file for GDB compile C++ language support.
   2    Copyright (C) 2016-2020 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #ifndef COMPILE_COMPILE_CPLUS_H
  18 #define COMPILE_COMPILE_CPLUS_H
  19
  20 #include "gdbsupport/enum-flags.h"
  21 #include "gcc-cp-plugin.h"
  22 #include "symtab.h"
  23
  24 struct type;
  25 struct block;
  26
  27 /* enum-flags wrapper  */
  28 DEF_ENUM_FLAGS_TYPE (enum gcc_cp_qualifiers, gcc_cp_qualifiers_flags);
  29 DEF_ENUM_FLAGS_TYPE (enum gcc_cp_ref_qualifiers, gcc_cp_ref_qualifiers_flags);
  30 DEF_ENUM_FLAGS_TYPE (enum gcc_cp_symbol_kind, gcc_cp_symbol_kind_flags);
  31
  32 class compile_cplus_instance;
  33
  34 /* A single component of a type's scope.  Type names are broken into
  35    "components," a series of unqualified names comprising the type name,
  36    e.g., "namespace1", "namespace2", "myclass".  */
  37
  38 struct scope_component
  39 {
  40   /* The unqualified name of this scope.  */
  41   std::string name;
  42
  43   /* The block symbol for this type/scope.  */
  44   struct block_symbol bsymbol;
  45 };
  46
  47 /* Comparison operators for scope_components.  */
  48
  49 bool operator== (const scope_component &lhs, const scope_component &rhs);
  50 bool operator!= (const scope_component &lhs, const scope_component &rhs);
  51
  52
  53 /* A single compiler scope used to define a type.
  54
  55    A compile_scope is a list of scope_components, where all leading
  56    scope_components are namespaces, followed by a single non-namespace
  57    type component (the actual type we are converting).  */
  58
  59 class compile_scope : private std::vector<scope_component>
  60 {
  61 public:
  62
  63   using std::vector<scope_component>::push_back;
  64   using std::vector<scope_component>::pop_back;
  65   using std::vector<scope_component>::back;
  66   using std::vector<scope_component>::empty;
  67   using std::vector<scope_component>::size;
  68   using std::vector<scope_component>::begin;
  69   using std::vector<scope_component>::end;
  70   using std::vector<scope_component>::operator[];
  71
  72   compile_scope ()
  73     : m_nested_type (GCC_TYPE_NONE), m_pushed (false)
  74   {
  75   }
  76
  77   /* Return the gcc_type of the type if it is a nested definition.
  78      Returns GCC_TYPE_NONE if this type was not nested.  */
  79   gcc_type nested_type ()
  80   {
  81     return m_nested_type;
  82   }
  83
  84 private:
  85
  86   /* compile_cplus_instance is a friend class so that it can set the
  87      following private members when compile_scopes are created.  */
  88   friend compile_cplus_instance;
  89
  90   /* If the type was actually a nested type, this will hold that nested
  91      type after the scope is pushed.  */
  92   gcc_type m_nested_type;
  93
  94   /* If true, this scope was pushed to the compiler and all namespaces
  95      must be popped when leaving the scope.  */
  96   bool m_pushed;
  97 };
  98
  99 /* Comparison operators for compile_scopes.  */
 100
 101 bool operator== (const compile_scope &lhs, const compile_scope &rhs);
 102 bool operator!= (const compile_scope &lhs, const compile_scope &rhs);
 103
 104 /* Convert TYPENAME into a vector of namespace and top-most/super
 105    composite scopes.
 106
 107    For example, for the input "Namespace::classB::classInner", the
 108    resultant vector will contain the tokens "Namespace" and
 109    "classB".  */
 110
 111 compile_scope type_name_to_scope (const char *type_name,
 112                                   const struct block *block);
 113
 114 /* A callback suitable for use as the GCC C++ symbol oracle.  */
 115
 116 extern gcc_cp_oracle_function gcc_cplus_convert_symbol;
 117
 118 /* A callback suitable for use as the GCC C++ address oracle.  */
 119
 120 extern gcc_cp_symbol_address_function gcc_cplus_symbol_address;
 121
 122 /* A subclass of compile_instance that is specific to the C++ front
 123    end.  */
 124
 125 class compile_cplus_instance : public compile_instance
 126 {
 127 public:
 128
 129   explicit compile_cplus_instance (struct gcc_cp_context *gcc_cp)
 130     : compile_instance (&gcc_cp->base, m_default_cflags),
 131       m_plugin (gcc_cp)
 132   {
 133     m_plugin.set_callbacks (gcc_cplus_convert_symbol,
 134                             gcc_cplus_symbol_address,
 135                             gcc_cplus_enter_scope, gcc_cplus_leave_scope,
 136                             this);
 137   }
 138
 139   /* Convert a gdb type, TYPE, to a GCC type.
 140
 141      If this type was defined in another type, NESTED_ACCESS should indicate
 142      the accessibility of this type (or GCC_CP_ACCESS_NONE if not a nested
 143      type).  GCC_CP_ACCESS_NONE is the default nested access.
 144
 145      The new GCC type is returned.  */
 146   gcc_type convert_type
 147     (struct type *type,
 148      enum gcc_cp_symbol_kind nested_access = GCC_CP_ACCESS_NONE);
 149
 150   /* Return a handle for the GCC plug-in.  */
 151   gcc_cp_plugin &plugin () { return m_plugin; }
 152
 153   /* Factory method to create a new scope based on TYPE with name TYPE_NAME.
 154      [TYPE_NAME could be TYPE_NAME or SYMBOL_NATURAL_NAME.]
 155
 156      If TYPE is a nested or local definition, nested_type () will return
 157      the gcc_type of the conversion.
 158
 159      Otherwise, nested_type () is GCC_TYPE_NONE.  */
 160   compile_scope new_scope (const char *type_name, struct type *type);
 161
 162   /* Enter the given NEW_SCOPE.  */
 163   void enter_scope (compile_scope &&scope);
 164
 165   /* Leave the current scope.  */
 166   void leave_scope ();
 167
 168   /* Add the qualifiers given by QUALS to BASE.  */
 169   gcc_type convert_qualified_base (gcc_type base,
 170                                    gcc_cp_qualifiers_flags quals);
 171
 172   /* Convert TARGET into a pointer type.  */
 173   gcc_type convert_pointer_base (gcc_type target);
 174
 175   /* Convert BASE into a reference type.  RQUALS describes the reference.  */
 176   gcc_type convert_reference_base (gcc_type base,
 177                                    enum gcc_cp_ref_qualifiers rquals);
 178
 179   /* Return the declaration name of the symbol named NATURAL.
 180      This returns a name with no function arguments or template parameters,
 181      suitable for passing to the compiler plug-in.  */
 182   static gdb::unique_xmalloc_ptr<char> decl_name (const char *natural);
 183
 184 private:
 185
 186   /* Callbacks suitable for use as the GCC C++ enter/leave scope requests.  */
 187   static gcc_cp_enter_leave_user_expr_scope_function gcc_cplus_enter_scope;
 188   static gcc_cp_enter_leave_user_expr_scope_function gcc_cplus_leave_scope;
 189
 190   /* Default compiler flags for C++.  */
 191   static const char *m_default_cflags;
 192
 193   /* The GCC plug-in.  */
 194   gcc_cp_plugin m_plugin;
 195
 196   /* A list of scopes we are processing.  */
 197   std::vector<compile_scope> m_scopes;
 198 };
 199
 200 /* Get the access flag for the NUM'th method of TYPE's FNI'th
 201    fieldlist.  */
 202
 203 enum gcc_cp_symbol_kind get_method_access_flag (const struct type *type,
 204                                                 int fni, int num);
 205
 206 #endif /* COMPILE_COMPILE_CPLUS_H */