gdb/rust-exp.h

   1 /* Definitions for Rust expressions
   2
   3    Copyright (C) 2020-2022 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program 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 of the License, or
  10    (at your option) any later version.
  11
  12    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #ifndef RUST_EXP_H
  21 #define RUST_EXP_H
  22
  23 #include "expop.h"
  24
  25 extern struct value *eval_op_rust_complement (struct type *expect_type,
  26                                               struct expression *exp,
  27                                               enum noside noside,
  28                                               enum exp_opcode opcode,
  29                                               struct value *value);
  30 extern struct value *eval_op_rust_array (struct type *expect_type,
  31                                          struct expression *exp,
  32                                          enum noside noside,
  33                                          enum exp_opcode opcode,
  34                                          struct value *ncopies,
  35                                          struct value *elt);
  36 extern struct value *rust_subscript (struct type *expect_type,
  37                                      struct expression *exp,
  38                                      enum noside noside, bool for_addr,
  39                                      struct value *lhs, struct value *rhs);
  40 extern struct value *rust_range (struct type *expect_type,
  41                                  struct expression *exp,
  42                                  enum noside noside, enum range_flag kind,
  43                                  struct value *low, struct value *high);
  44
  45 namespace expr
  46 {
  47
  48 using rust_unop_compl_operation = unop_operation<UNOP_COMPLEMENT,
  49                                                   eval_op_rust_complement>;
  50 using rust_array_operation = binop_operation<OP_RUST_ARRAY,
  51                                              eval_op_rust_array>;
  52
  53 /* The Rust indirection operation.  */
  54 class rust_unop_ind_operation
  55   : public unop_ind_operation
  56 {
  57 public:
  58
  59   using unop_ind_operation::unop_ind_operation;
  60
  61   value *evaluate (struct type *expect_type,
  62                    struct expression *exp,
  63                    enum noside noside) override;
  64 };
  65
  66 /* Subscript operator for Rust.  */
  67 class rust_subscript_operation
  68   : public tuple_holding_operation<operation_up, operation_up>
  69 {
  70 public:
  71
  72   using tuple_holding_operation::tuple_holding_operation;
  73
  74   value *evaluate (struct type *expect_type,
  75                    struct expression *exp,
  76                    enum noside noside) override
  77   {
  78     value *arg1 = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
  79     value *arg2 = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
  80     return rust_subscript (expect_type, exp, noside, false, arg1, arg2);
  81   }
  82
  83   value *slice (struct type *expect_type,
  84                 struct expression *exp,
  85                 enum noside noside)
  86   {
  87     value *arg1 = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
  88     value *arg2 = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
  89     return rust_subscript (expect_type, exp, noside, true, arg1, arg2);
  90   }
  91
  92   enum exp_opcode opcode () const override
  93   { return BINOP_SUBSCRIPT; }
  94 };
  95
  96 class rust_unop_addr_operation
  97   : public tuple_holding_operation<operation_up>
  98 {
  99 public:
 100
 101   using tuple_holding_operation::tuple_holding_operation;
 102
 103   value *evaluate (struct type *expect_type,
 104                    struct expression *exp,
 105                    enum noside noside) override
 106   {
 107     operation *oper = std::get<0> (m_storage).get ();
 108     rust_subscript_operation *sub_op
 109       = dynamic_cast<rust_subscript_operation *> (oper);
 110     if (sub_op != nullptr)
 111       return sub_op->slice (expect_type, exp, noside);
 112     return oper->evaluate_for_address (exp, noside);
 113   }
 114
 115   enum exp_opcode opcode () const override
 116   { return UNOP_ADDR; }
 117 };
 118
 119 /* The Rust range operators.  */
 120 class rust_range_operation
 121   : public tuple_holding_operation<enum range_flag, operation_up, operation_up>
 122 {
 123 public:
 124
 125   using tuple_holding_operation::tuple_holding_operation;
 126
 127   value *evaluate (struct type *expect_type,
 128                    struct expression *exp,
 129                    enum noside noside) override
 130   {
 131     auto kind = std::get<0> (m_storage);
 132     value *low = nullptr;
 133     if (std::get<1> (m_storage) != nullptr)
 134       low = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
 135     value *high = nullptr;
 136     if (std::get<2> (m_storage) != nullptr)
 137       high = std::get<2> (m_storage)->evaluate (nullptr, exp, noside);
 138     return rust_range (expect_type, exp, noside, kind, low, high);
 139   }
 140
 141   enum exp_opcode opcode () const override
 142   { return OP_RANGE; }
 143 };
 144
 145 /* Tuple field reference (using an integer).  */
 146 class rust_struct_anon
 147   : public tuple_holding_operation<int, operation_up>
 148 {
 149 public:
 150
 151   using tuple_holding_operation::tuple_holding_operation;
 152
 153   value *evaluate (struct type *expect_type,
 154                    struct expression *exp,
 155                    enum noside noside) override;
 156
 157   enum exp_opcode opcode () const override
 158   { return STRUCTOP_ANONYMOUS; }
 159 };
 160
 161 /* Structure (or union or enum) field reference.  */
 162 class rust_structop
 163   : public structop_base_operation
 164 {
 165 public:
 166
 167   using structop_base_operation::structop_base_operation;
 168
 169   value *evaluate (struct type *expect_type,
 170                    struct expression *exp,
 171                    enum noside noside) override;
 172
 173   value *evaluate_funcall (struct type *expect_type,
 174                            struct expression *exp,
 175                            enum noside noside,
 176                            const std::vector<operation_up> &args) override;
 177
 178   enum exp_opcode opcode () const override
 179   { return STRUCTOP_STRUCT; }
 180 };
 181
 182 /* Rust aggregate initialization.  */
 183 class rust_aggregate_operation
 184   : public tuple_holding_operation<struct type *, operation_up,
 185                                    std::vector<std::pair<std::string,
 186                                                          operation_up>>>
 187 {
 188 public:
 189
 190   using tuple_holding_operation::tuple_holding_operation;
 191
 192   value *evaluate (struct type *expect_type,
 193                    struct expression *exp,
 194                    enum noside noside) override;
 195
 196   enum exp_opcode opcode () const override
 197   { return OP_AGGREGATE; }
 198 };
 199
 200 /* Rust parenthesized operation.  This is needed to distinguish
 201    between 'obj.f()', which is a method call, and '(obj.f)()', which
 202    is a call of a function-valued field 'f'.  */
 203 class rust_parenthesized_operation
 204   : public tuple_holding_operation<operation_up>
 205 {
 206 public:
 207
 208   explicit rust_parenthesized_operation (operation_up op)
 209     : tuple_holding_operation (std::move (op))
 210   {
 211   }
 212
 213   value *evaluate (struct type *expect_type,
 214                    struct expression *exp,
 215                    enum noside noside) override
 216   {
 217     return std::get<0> (m_storage)->evaluate (expect_type, exp, noside);
 218   }
 219
 220   enum exp_opcode opcode () const override
 221   {
 222     /* A lie but this isn't worth introducing a new opcode for.  */
 223     return UNOP_PLUS;
 224   }
 225 };
 226
 227 } /* namespace expr */
 228
 229 #endif /* RUST_EXP_H */