mirror of
https://sourceware.org/git/binutils-gdb.git
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d4da1b2c1b
This updates the Ada expression parser to implement context-sensitive field name completion. This is PR ada/28727. This is somewhat complicated due to some choices in the Ada lexer -- it chooses to represent a sequence of "."-separated identifiers as a single token, so the parser must partially recreate the completer's logic to find the completion word boundaries. Despite the minor warts in this patch, though, it is a decent improvement. It's possible that the DWARF reader rewrite will help fix the package completion problem pointed out in this patch as well. Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=28727
815 lines
23 KiB
C++
815 lines
23 KiB
C++
/* Definitions for Ada expressions
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Copyright (C) 2020-2022 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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/* Possibly replace this object with some other expression object.
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This is like 'resolve', but can return a replacement.
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The default implementation calls 'resolve' and wraps this object
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in a function call if that call returns true. OWNER is a
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reference to the unique pointer that owns the 'this'; it can be
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'move'd from to construct the replacement.
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This should either return a new object, or OWNER -- never
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nullptr. */
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virtual operation_up replace (operation_up &&owner,
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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);
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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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/* Return the underlying string. */
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const char *get_name () const
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{
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return std::get<0> (m_storage).c_str ();
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}
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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<BINOP_MIN, ada_binop_minmax>;
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using ada_binop_max_operation = binop_operation<BINOP_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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const block *get_block () const
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{ return std::get<0> (m_storage).block; }
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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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/* Set the completion prefix. */
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void set_prefix (std::string &&prefix)
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{
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m_prefix = std::move (prefix);
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}
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bool complete (struct expression *exp, completion_tracker &tracker) override
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{
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return structop_base_operation::complete (exp, tracker, m_prefix.c_str ());
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}
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void dump (struct ui_file *stream, int depth) const override
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{
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structop_base_operation::dump (stream, depth);
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dump_for_expression (stream, depth + 1, m_prefix);
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}
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private:
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/* We may need to provide a prefix to field name completion. See
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ada-exp.y:find_completion_bounds for details. */
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std::string m_prefix;
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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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/* An Ada assignment operation. */
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class ada_assign_operation
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: public assign_operation
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{
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public:
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using assign_operation::assign_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 BINOP_ASSIGN; }
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};
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/* This abstract class represents a single component in an Ada
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aggregate assignment. */
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class ada_component
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{
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public:
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|
/* Assign to LHS, which is part of CONTAINER. EXP is the expression
|
|
being evaluated. INDICES, LOW, and HIGH indicate which
|
|
sub-components have already been assigned; INDICES should be
|
|
updated by this call. */
|
|
virtual void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high) = 0;
|
|
|
|
/* Same as operation::uses_objfile. */
|
|
virtual bool uses_objfile (struct objfile *objfile) = 0;
|
|
|
|
/* Same as operation::dump. */
|
|
virtual void dump (ui_file *stream, int depth) = 0;
|
|
|
|
virtual ~ada_component () = default;
|
|
|
|
protected:
|
|
|
|
ada_component () = default;
|
|
DISABLE_COPY_AND_ASSIGN (ada_component);
|
|
};
|
|
|
|
/* Unique pointer specialization for Ada assignment components. */
|
|
typedef std::unique_ptr<ada_component> ada_component_up;
|
|
|
|
/* An operation that holds a single component. */
|
|
class ada_aggregate_operation
|
|
: public tuple_holding_operation<ada_component_up>
|
|
{
|
|
public:
|
|
|
|
using tuple_holding_operation::tuple_holding_operation;
|
|
|
|
/* Assuming that LHS represents an lvalue having a record or array
|
|
type, evaluate an assignment of this aggregate's value to LHS.
|
|
CONTAINER is an lvalue containing LHS (possibly LHS itself).
|
|
Does not modify the inferior's memory, nor does it modify the
|
|
contents of LHS (unless == CONTAINER). Returns the modified
|
|
CONTAINER. */
|
|
|
|
value *assign_aggregate (struct value *container,
|
|
struct value *lhs,
|
|
struct expression *exp);
|
|
|
|
value *evaluate (struct type *expect_type,
|
|
struct expression *exp,
|
|
enum noside noside) override
|
|
{
|
|
error (_("Aggregates only allowed on the right of an assignment"));
|
|
}
|
|
|
|
enum exp_opcode opcode () const override
|
|
{ return OP_AGGREGATE; }
|
|
};
|
|
|
|
/* A component holding a vector of other components to assign. */
|
|
class ada_aggregate_component : public ada_component
|
|
{
|
|
public:
|
|
|
|
explicit ada_aggregate_component (std::vector<ada_component_up> &&components)
|
|
: m_components (std::move (components))
|
|
{
|
|
}
|
|
|
|
void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high) override;
|
|
|
|
bool uses_objfile (struct objfile *objfile) override;
|
|
|
|
void dump (ui_file *stream, int depth) override;
|
|
|
|
private:
|
|
|
|
std::vector<ada_component_up> m_components;
|
|
};
|
|
|
|
/* A component that assigns according to a provided index (which is
|
|
relative to the "low" value). */
|
|
class ada_positional_component : public ada_component
|
|
{
|
|
public:
|
|
|
|
ada_positional_component (int index, operation_up &&op)
|
|
: m_index (index),
|
|
m_op (std::move (op))
|
|
{
|
|
}
|
|
|
|
void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high) override;
|
|
|
|
bool uses_objfile (struct objfile *objfile) override;
|
|
|
|
void dump (ui_file *stream, int depth) override;
|
|
|
|
private:
|
|
|
|
int m_index;
|
|
operation_up m_op;
|
|
};
|
|
|
|
/* A component which handles an "others" clause. */
|
|
class ada_others_component : public ada_component
|
|
{
|
|
public:
|
|
|
|
explicit ada_others_component (operation_up &&op)
|
|
: m_op (std::move (op))
|
|
{
|
|
}
|
|
|
|
void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high) override;
|
|
|
|
bool uses_objfile (struct objfile *objfile) override;
|
|
|
|
void dump (ui_file *stream, int depth) override;
|
|
|
|
private:
|
|
|
|
operation_up m_op;
|
|
};
|
|
|
|
/* An interface that represents an association that is used in
|
|
aggregate assignment. */
|
|
class ada_association
|
|
{
|
|
public:
|
|
|
|
/* Like ada_component::assign, but takes an operation as a
|
|
parameter. The operation is evaluated and then assigned into LHS
|
|
according to the rules of the concrete implementation. */
|
|
virtual void assign (struct value *container,
|
|
struct value *lhs,
|
|
struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high,
|
|
operation_up &op) = 0;
|
|
|
|
/* Same as operation::uses_objfile. */
|
|
virtual bool uses_objfile (struct objfile *objfile) = 0;
|
|
|
|
/* Same as operation::dump. */
|
|
virtual void dump (ui_file *stream, int depth) = 0;
|
|
|
|
virtual ~ada_association () = default;
|
|
|
|
protected:
|
|
|
|
ada_association () = default;
|
|
DISABLE_COPY_AND_ASSIGN (ada_association);
|
|
};
|
|
|
|
/* Unique pointer specialization for Ada assignment associations. */
|
|
typedef std::unique_ptr<ada_association> ada_association_up;
|
|
|
|
/* A component that holds a vector of associations and an operation.
|
|
The operation is re-evaluated for each choice. */
|
|
class ada_choices_component : public ada_component
|
|
{
|
|
public:
|
|
|
|
explicit ada_choices_component (operation_up &&op)
|
|
: m_op (std::move (op))
|
|
{
|
|
}
|
|
|
|
/* Set the vector of associations. This is done separately from the
|
|
constructor because it was simpler for the implementation of the
|
|
parser. */
|
|
void set_associations (std::vector<ada_association_up> &&assoc)
|
|
{
|
|
m_assocs = std::move (assoc);
|
|
}
|
|
|
|
void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high) override;
|
|
|
|
bool uses_objfile (struct objfile *objfile) override;
|
|
|
|
void dump (ui_file *stream, int depth) override;
|
|
|
|
private:
|
|
|
|
std::vector<ada_association_up> m_assocs;
|
|
operation_up m_op;
|
|
};
|
|
|
|
/* An association that uses a discrete range. */
|
|
class ada_discrete_range_association : public ada_association
|
|
{
|
|
public:
|
|
|
|
ada_discrete_range_association (operation_up &&low, operation_up &&high)
|
|
: m_low (std::move (low)),
|
|
m_high (std::move (high))
|
|
{
|
|
}
|
|
|
|
void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high,
|
|
operation_up &op) override;
|
|
|
|
bool uses_objfile (struct objfile *objfile) override;
|
|
|
|
void dump (ui_file *stream, int depth) override;
|
|
|
|
private:
|
|
|
|
operation_up m_low;
|
|
operation_up m_high;
|
|
};
|
|
|
|
/* An association that uses a name. The name may be an expression
|
|
that evaluates to an integer (for arrays), or an Ada string or
|
|
variable value operation. */
|
|
class ada_name_association : public ada_association
|
|
{
|
|
public:
|
|
|
|
explicit ada_name_association (operation_up val)
|
|
: m_val (std::move (val))
|
|
{
|
|
}
|
|
|
|
void assign (struct value *container,
|
|
struct value *lhs, struct expression *exp,
|
|
std::vector<LONGEST> &indices,
|
|
LONGEST low, LONGEST high,
|
|
operation_up &op) override;
|
|
|
|
bool uses_objfile (struct objfile *objfile) override;
|
|
|
|
void dump (ui_file *stream, int depth) override;
|
|
|
|
private:
|
|
|
|
operation_up m_val;
|
|
};
|
|
|
|
/* A character constant expression. This is a separate operation so
|
|
that it can participate in resolution, so that TYPE'(CST) can
|
|
work correctly for enums with character enumerators. */
|
|
class ada_char_operation : public long_const_operation,
|
|
public ada_resolvable
|
|
{
|
|
public:
|
|
|
|
using long_const_operation::long_const_operation;
|
|
|
|
bool resolve (struct expression *exp,
|
|
bool deprocedure_p,
|
|
bool parse_completion,
|
|
innermost_block_tracker *tracker,
|
|
struct type *context_type) override
|
|
{
|
|
/* This should never be called, because this class also implements
|
|
'replace'. */
|
|
gdb_assert_not_reached ("unexpected call");
|
|
}
|
|
|
|
operation_up replace (operation_up &&owner,
|
|
struct expression *exp,
|
|
bool deprocedure_p,
|
|
bool parse_completion,
|
|
innermost_block_tracker *tracker,
|
|
struct type *context_type) override;
|
|
|
|
value *evaluate (struct type *expect_type,
|
|
struct expression *exp,
|
|
enum noside noside) override;
|
|
};
|
|
|
|
class ada_concat_operation : public concat_operation
|
|
{
|
|
public:
|
|
|
|
using concat_operation::concat_operation;
|
|
|
|
value *evaluate (struct type *expect_type,
|
|
struct expression *exp,
|
|
enum noside noside) override;
|
|
};
|
|
|
|
} /* namespace expr */
|
|
|
|
#endif /* ADA_EXP_H */
|