d8a4ed8ad1
Ada has a parser post-pass that implements "resolution". This process replaces some opcodes with function calls. For example, a "+" operation might be replaced with a call to the appropriate overloaded function. This differs from the approach taken for the same problem in C++. However, in this series I chose not to try to make changes outside of rewrite the expression data structure. So, resolution remains. The new approach to resolution is to introduce an interface class, that some concrete operations implement. Then, the Ada code will use this to resolve the expression tree. Because new-style expressions are built as ordinary objects, and don't require rewriting the data structure in place, in the new code this processing will be done in the parser. By the end of the series, some special cases in this area that exist only for Ada will be removed. gdb/ChangeLog 2021-03-08 Tom Tromey <tom@tromey.com> * ada-lang.c (ada_var_value_operation::resolve) (ada_funcall_operation::resolve) (ada_ternop_slice_operation::resolve): New methods. * ada-exp.h (struct ada_resolvable): New. (class ada_var_value_operation): Derive from ada_resolvable. <get_block, resolve>: New methods. (class ada_funcall_operation): Derive from ada_resolvable. <resolve>: New method. (class ada_ternop_slice_operation): Derive from ada_resolvable. <resolve>: New method.
453 lines
13 KiB
C++
453 lines
13 KiB
C++
/* Definitions for Ada expressions
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Copyright (C) 2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef ADA_EXP_H
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#define ADA_EXP_H
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#include "expop.h"
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extern struct value *ada_unop_neg (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1);
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extern struct value *ada_atr_tag (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1);
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extern struct value *ada_atr_size (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1);
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extern struct value *ada_abs (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1);
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extern struct value *ada_unop_in_range (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1, struct type *type);
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extern struct value *ada_mult_binop (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1, struct value *arg2);
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extern struct value *ada_equal_binop (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1, struct value *arg2);
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extern struct value *ada_ternop_slice (struct expression *exp,
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enum noside noside,
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struct value *array,
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struct value *low_bound_val,
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struct value *high_bound_val);
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extern struct value *ada_binop_in_bounds (struct expression *exp,
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enum noside noside,
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struct value *arg1,
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struct value *arg2,
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int n);
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extern struct value *ada_binop_minmax (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1,
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struct value *arg2);
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extern struct value *ada_pos_atr (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg);
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extern struct value *ada_val_atr (enum noside noside, struct type *type,
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struct value *arg);
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extern struct value *ada_binop_exp (struct type *expect_type,
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struct expression *exp,
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enum noside noside, enum exp_opcode op,
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struct value *arg1, struct value *arg2);
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namespace expr
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{
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/* The base class for Ada type resolution. Ada operations that want
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to participate in resolution implement this interface. */
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struct ada_resolvable
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{
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/* Resolve this object. EXP is the expression being resolved.
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DEPROCEDURE_P is true if a symbol that refers to a zero-argument
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function may be turned into a function call. PARSE_COMPLETION
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and TRACKER are passed in from the parser context. CONTEXT_TYPE
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is the expected type of the expression, or nullptr if none is
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known. This method should return true if the operation should be
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replaced by a function call with this object as the callee. */
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virtual bool resolve (struct expression *exp,
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bool deprocedure_p,
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bool parse_completion,
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innermost_block_tracker *tracker,
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struct type *context_type) = 0;
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};
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/* In Ada, some generic operations must be wrapped with a handler that
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handles some Ada-specific type conversions. */
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class ada_wrapped_operation
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: public tuple_holding_operation<operation_up>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return std::get<0> (m_storage)->opcode (); }
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};
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/* An Ada string constant. */
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class ada_string_operation
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: public string_operation
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{
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public:
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using string_operation::string_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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};
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/* The Ada TYPE'(EXP) construct. */
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class ada_qual_operation
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: public tuple_holding_operation<operation_up, struct type *>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return UNOP_QUAL; }
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};
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/* Ternary in-range operator. */
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class ada_ternop_range_operation
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: public tuple_holding_operation<operation_up, operation_up, operation_up>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return TERNOP_IN_RANGE; }
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};
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using ada_neg_operation = unop_operation<UNOP_NEG, ada_unop_neg>;
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using ada_atr_tag_operation = unop_operation<OP_ATR_TAG, ada_atr_tag>;
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using ada_atr_size_operation = unop_operation<OP_ATR_SIZE, ada_atr_size>;
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using ada_abs_operation = unop_operation<UNOP_ABS, ada_abs>;
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using ada_pos_operation = unop_operation<OP_ATR_POS, ada_pos_atr>;
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/* The in-range operation, given a type. */
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class ada_unop_range_operation
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: public tuple_holding_operation<operation_up, struct type *>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override
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{
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value *val = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
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return ada_unop_in_range (expect_type, exp, noside, UNOP_IN_RANGE,
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val, std::get<1> (m_storage));
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}
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enum exp_opcode opcode () const override
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{ return UNOP_IN_RANGE; }
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};
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/* The Ada + and - operators. */
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class ada_binop_addsub_operation
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: public tuple_holding_operation<enum exp_opcode, operation_up, operation_up>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return std::get<0> (m_storage); }
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};
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using ada_binop_mul_operation = binop_operation<BINOP_MUL, ada_mult_binop>;
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using ada_binop_div_operation = binop_operation<BINOP_DIV, ada_mult_binop>;
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using ada_binop_rem_operation = binop_operation<BINOP_REM, ada_mult_binop>;
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using ada_binop_mod_operation = binop_operation<BINOP_MOD, ada_mult_binop>;
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using ada_binop_min_operation = binop_operation<OP_ATR_MIN, ada_binop_minmax>;
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using ada_binop_max_operation = binop_operation<OP_ATR_MAX, ada_binop_minmax>;
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using ada_binop_exp_operation = binop_operation<BINOP_EXP, ada_binop_exp>;
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/* Implement the equal and not-equal operations for Ada. */
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class ada_binop_equal_operation
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: public tuple_holding_operation<enum exp_opcode, operation_up, operation_up>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override
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{
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value *arg1 = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
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value *arg2 = std::get<2> (m_storage)->evaluate (value_type (arg1),
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exp, noside);
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return ada_equal_binop (expect_type, exp, noside, std::get<0> (m_storage),
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arg1, arg2);
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}
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enum exp_opcode opcode () const override
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{ return std::get<0> (m_storage); }
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};
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/* Bitwise operators for Ada. */
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template<enum exp_opcode OP>
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class ada_bitwise_operation
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: public maybe_constant_operation<operation_up, operation_up>
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{
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public:
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using maybe_constant_operation::maybe_constant_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override
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{
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value *lhs = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
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value *rhs = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
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value *result = eval_op_binary (expect_type, exp, noside, OP, lhs, rhs);
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return value_cast (value_type (lhs), result);
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}
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enum exp_opcode opcode () const override
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{ return OP; }
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};
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using ada_bitwise_and_operation = ada_bitwise_operation<BINOP_BITWISE_AND>;
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using ada_bitwise_ior_operation = ada_bitwise_operation<BINOP_BITWISE_IOR>;
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using ada_bitwise_xor_operation = ada_bitwise_operation<BINOP_BITWISE_XOR>;
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/* Ada array- or string-slice operation. */
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class ada_ternop_slice_operation
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: public maybe_constant_operation<operation_up, operation_up, operation_up>,
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public ada_resolvable
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{
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public:
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using maybe_constant_operation::maybe_constant_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override
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{
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value *array = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
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value *low = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
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value *high = std::get<2> (m_storage)->evaluate (nullptr, exp, noside);
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return ada_ternop_slice (exp, noside, array, low, high);
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}
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enum exp_opcode opcode () const override
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{ return TERNOP_SLICE; }
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bool resolve (struct expression *exp,
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bool deprocedure_p,
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bool parse_completion,
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innermost_block_tracker *tracker,
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struct type *context_type) override;
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};
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/* Implement BINOP_IN_BOUNDS for Ada. */
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class ada_binop_in_bounds_operation
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: public maybe_constant_operation<operation_up, operation_up, int>
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{
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public:
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using maybe_constant_operation::maybe_constant_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override
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{
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value *arg1 = std::get<0> (m_storage)->evaluate (nullptr, exp, noside);
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value *arg2 = std::get<1> (m_storage)->evaluate (nullptr, exp, noside);
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return ada_binop_in_bounds (exp, noside, arg1, arg2,
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std::get<2> (m_storage));
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}
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enum exp_opcode opcode () const override
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{ return BINOP_IN_BOUNDS; }
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};
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/* Implement several unary Ada OP_ATR_* operations. */
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class ada_unop_atr_operation
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: public maybe_constant_operation<operation_up, enum exp_opcode, int>
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{
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public:
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using maybe_constant_operation::maybe_constant_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return std::get<1> (m_storage); }
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};
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/* Variant of var_value_operation for Ada. */
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class ada_var_value_operation
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: public var_value_operation, public ada_resolvable
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{
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public:
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using var_value_operation::var_value_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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value *evaluate_for_cast (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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symbol *get_symbol () const
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{ return std::get<0> (m_storage); }
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const block *get_block () const
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{ return std::get<1> (m_storage); }
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bool resolve (struct expression *exp,
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bool deprocedure_p,
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bool parse_completion,
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innermost_block_tracker *tracker,
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struct type *context_type) override;
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protected:
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using operation::do_generate_ax;
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};
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/* Variant of var_msym_value_operation for Ada. */
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class ada_var_msym_value_operation
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: public var_msym_value_operation
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{
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public:
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using var_msym_value_operation::var_msym_value_operation;
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value *evaluate_for_cast (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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protected:
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using operation::do_generate_ax;
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};
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/* Implement the Ada 'val attribute. */
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class ada_atr_val_operation
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: public tuple_holding_operation<struct type *, operation_up>
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return OP_ATR_VAL; }
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};
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/* The indirection operator for Ada. */
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class ada_unop_ind_operation
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: public unop_ind_base_operation
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{
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public:
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using unop_ind_base_operation::unop_ind_base_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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};
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/* Implement STRUCTOP_STRUCT for Ada. */
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class ada_structop_operation
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: public structop_base_operation
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{
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public:
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using structop_base_operation::structop_base_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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enum exp_opcode opcode () const override
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{ return STRUCTOP_STRUCT; }
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};
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/* Function calls for Ada. */
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class ada_funcall_operation
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: public tuple_holding_operation<operation_up, std::vector<operation_up>>,
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public ada_resolvable
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{
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public:
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using tuple_holding_operation::tuple_holding_operation;
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value *evaluate (struct type *expect_type,
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struct expression *exp,
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enum noside noside) override;
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bool resolve (struct expression *exp,
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bool deprocedure_p,
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bool parse_completion,
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innermost_block_tracker *tracker,
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struct type *context_type) override;
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enum exp_opcode opcode () const override
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{ return OP_FUNCALL; }
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};
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} /* namespace expr */
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#endif /* ADA_EXP_H */
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