mirror of
https://github.com/espressif/binutils-gdb.git
synced 2025-06-14 04:17:58 +08:00
Remove now-unused Rust evaluator code
Now that the Rust parser has switched to the new style, there is no need for the old Rust evaluation code. gdb/ChangeLog 2021-03-08 Tom Tromey <tom@tromey.com> * rust-lang.h (class rust_language) <expression_ops, exp_descriptor_tab>: Remove. * rust-lang.c (rust_evaluate_funcall): Remove. (rust_range, rust_subscript, eval_op_rust_complement): Don't use EVAL_SKIP. (rust_evaluate_subexp): Remove. (rust_aggregate_operation::evaluate): Don't use EVAL_SKIP. (rust_operator_length, rust_dump_subexp_body, rust_print_subexp) (rust_operator_check, rust_language::exp_descriptor_tab): Remove.
This commit is contained in:
Tom Tromey
507
gdb/rust-lang.c
507
gdb/rust-lang.c
@ -963,82 +963,6 @@ rust_slice_type (const char *name, struct type *elt_type,
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/* A helper for rust_evaluate_subexp that handles OP_FUNCALL. */
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static struct value *
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rust_evaluate_funcall (struct expression *exp, int *pos, enum noside noside)
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{
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int i;
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int num_args = exp->elts[*pos + 1].longconst;
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const char *method;
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struct value *function, *result, *arg0;
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struct type *type, *fn_type;
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const struct block *block;
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struct block_symbol sym;
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/* For an ordinary function call we can simply defer to the
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generic implementation. */
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if (exp->elts[*pos + 3].opcode != STRUCTOP_STRUCT)
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return evaluate_subexp_standard (NULL, exp, pos, noside);
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/* Skip over the OP_FUNCALL and the STRUCTOP_STRUCT. */
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*pos += 4;
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method = &exp->elts[*pos + 1].string;
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*pos += 3 + BYTES_TO_EXP_ELEM (exp->elts[*pos].longconst + 1);
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/* Evaluate the argument to STRUCTOP_STRUCT, then find its
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type in order to look up the method. */
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arg0 = evaluate_subexp (nullptr, exp, pos, noside);
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if (noside == EVAL_SKIP)
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{
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for (i = 0; i < num_args; ++i)
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evaluate_subexp (nullptr, exp, pos, noside);
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return arg0;
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}
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std::vector<struct value *> args (num_args + 1);
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args[0] = arg0;
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/* We don't yet implement real Deref semantics. */
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while (value_type (args[0])->code () == TYPE_CODE_PTR)
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args[0] = value_ind (args[0]);
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type = value_type (args[0]);
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if ((type->code () != TYPE_CODE_STRUCT
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&& type->code () != TYPE_CODE_UNION
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&& type->code () != TYPE_CODE_ENUM)
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|| rust_tuple_type_p (type))
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error (_("Method calls only supported on struct or enum types"));
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if (type->name () == NULL)
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error (_("Method call on nameless type"));
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std::string name = std::string (type->name ()) + "::" + method;
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block = get_selected_block (0);
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sym = lookup_symbol (name.c_str (), block, VAR_DOMAIN, NULL);
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if (sym.symbol == NULL)
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error (_("Could not find function named '%s'"), name.c_str ());
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fn_type = SYMBOL_TYPE (sym.symbol);
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if (fn_type->num_fields () == 0)
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error (_("Function '%s' takes no arguments"), name.c_str ());
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if (fn_type->field (0).type ()->code () == TYPE_CODE_PTR)
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args[0] = value_addr (args[0]);
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function = address_of_variable (sym.symbol, block);
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for (i = 0; i < num_args; ++i)
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args[i + 1] = evaluate_subexp (nullptr, exp, pos, noside);
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if (noside == EVAL_AVOID_SIDE_EFFECTS)
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result = value_zero (TYPE_TARGET_TYPE (fn_type), not_lval);
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else
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result = call_function_by_hand (function, NULL, args);
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return result;
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}
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/* A helper for rust_evaluate_subexp that handles OP_RANGE. */
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struct value *
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@ -1055,9 +979,6 @@ rust_range (struct type *expect_type, struct expression *exp,
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bool inclusive = !(kind & RANGE_HIGH_BOUND_EXCLUSIVE);
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if (noside == EVAL_SKIP)
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return value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
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if (low == NULL)
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{
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if (high == NULL)
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@ -1181,9 +1102,6 @@ rust_subscript (struct type *expect_type, struct expression *exp,
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LONGEST high = 0;
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int want_slice = 0;
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if (noside == EVAL_SKIP)
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return lhs;
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rhstype = check_typedef (value_type (rhs));
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if (rust_range_type_p (rhstype))
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{
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@ -1347,11 +1265,6 @@ eval_op_rust_complement (struct type *expect_type, struct expression *exp,
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enum exp_opcode opcode,
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struct value *value)
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{
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if (noside == EVAL_SKIP)
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{
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/* Preserving the type is enough. */
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return value;
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}
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if (value_type (value)->code () == TYPE_CODE_BOOL)
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return value_from_longest (value_type (value), value_logical_not (value));
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return value_complement (value);
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@ -1502,204 +1415,6 @@ eval_op_rust_structop (struct type *expect_type, struct expression *exp,
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return result;
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}
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/* evaluate_exp implementation for Rust. */
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static struct value *
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rust_evaluate_subexp (struct type *expect_type, struct expression *exp,
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int *pos, enum noside noside)
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{
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struct value *result;
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enum exp_opcode op = exp->elts[*pos].opcode;
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switch (op)
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{
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case UNOP_IND:
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{
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if (noside != EVAL_NORMAL)
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result = evaluate_subexp_standard (expect_type, exp, pos, noside);
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else
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{
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++*pos;
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struct value *value = evaluate_subexp (expect_type, exp, pos,
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noside);
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result = eval_op_rust_ind (expect_type, exp, noside, op, value);
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}
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}
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break;
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case UNOP_COMPLEMENT:
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{
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struct value *value;
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++*pos;
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value = evaluate_subexp (nullptr, exp, pos, noside);
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result = eval_op_rust_complement (expect_type, exp, noside, op, value);
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}
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break;
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case BINOP_SUBSCRIPT:
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{
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++*pos;
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struct value *lhs = evaluate_subexp (nullptr, exp, pos, noside);
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struct value *rhs = evaluate_subexp (nullptr, exp, pos, noside);
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result = rust_subscript (expect_type, exp, noside, false, lhs, rhs);
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}
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break;
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case OP_FUNCALL:
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result = rust_evaluate_funcall (exp, pos, noside);
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break;
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case OP_AGGREGATE:
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{
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int pc = (*pos)++;
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struct type *type = exp->elts[pc + 1].type;
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int arglen = longest_to_int (exp->elts[pc + 2].longconst);
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int i;
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CORE_ADDR addr = 0;
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struct value *addrval = NULL;
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*pos += 3;
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if (noside == EVAL_NORMAL)
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{
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addrval = value_allocate_space_in_inferior (TYPE_LENGTH (type));
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addr = value_as_long (addrval);
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result = value_at_lazy (type, addr);
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}
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if (arglen > 0 && exp->elts[*pos].opcode == OP_OTHERS)
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{
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struct value *init;
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++*pos;
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init = rust_evaluate_subexp (NULL, exp, pos, noside);
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if (noside == EVAL_NORMAL)
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{
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/* This isn't quite right but will do for the time
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being, seeing that we can't implement the Copy
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trait anyway. */
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value_assign (result, init);
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}
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--arglen;
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}
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gdb_assert (arglen % 2 == 0);
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for (i = 0; i < arglen; i += 2)
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{
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int len;
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const char *fieldname;
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struct value *value, *field;
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gdb_assert (exp->elts[*pos].opcode == OP_NAME);
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++*pos;
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len = longest_to_int (exp->elts[*pos].longconst);
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++*pos;
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fieldname = &exp->elts[*pos].string;
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*pos += 2 + BYTES_TO_EXP_ELEM (len + 1);
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value = rust_evaluate_subexp (NULL, exp, pos, noside);
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if (noside == EVAL_NORMAL)
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{
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field = value_struct_elt (&result, NULL, fieldname, NULL,
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"structure");
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value_assign (field, value);
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}
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}
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if (noside == EVAL_SKIP)
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return value_from_longest (builtin_type (exp->gdbarch)->builtin_int,
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1);
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else if (noside == EVAL_AVOID_SIDE_EFFECTS)
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result = allocate_value (type);
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else
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result = value_at_lazy (type, addr);
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}
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break;
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case OP_RUST_ARRAY:
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{
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(*pos)++;
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struct value *elt;
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struct value *ncopies;
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elt = rust_evaluate_subexp (NULL, exp, pos, noside);
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ncopies = rust_evaluate_subexp (NULL, exp, pos, noside);
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return eval_op_rust_array (expect_type, exp, noside, op, elt, ncopies);
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}
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break;
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case STRUCTOP_ANONYMOUS:
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{
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/* Anonymous field access, i.e. foo.1. */
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struct value *lhs;
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int pc, field_number;
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pc = (*pos)++;
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field_number = longest_to_int (exp->elts[pc + 1].longconst);
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(*pos) += 2;
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lhs = evaluate_subexp (nullptr, exp, pos, noside);
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return eval_op_rust_struct_anon (expect_type, exp, noside,
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field_number, lhs);
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}
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break;
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case STRUCTOP_STRUCT:
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{
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struct value *lhs;
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int tem, pc;
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pc = (*pos)++;
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tem = longest_to_int (exp->elts[pc + 1].longconst);
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(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
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lhs = evaluate_subexp (nullptr, exp, pos, noside);
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const char *field_name = &exp->elts[pc + 2].string;
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return eval_op_rust_structop (expect_type, exp, noside, lhs,
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field_name);
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}
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break;
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case OP_RANGE:
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{
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struct value *low = NULL, *high = NULL;
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auto kind
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= (enum range_flag) longest_to_int (exp->elts[*pos + 1].longconst);
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*pos += 3;
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if (!(kind & RANGE_LOW_BOUND_DEFAULT))
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low = evaluate_subexp (nullptr, exp, pos, noside);
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if (!(kind & RANGE_HIGH_BOUND_DEFAULT))
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high = evaluate_subexp (nullptr, exp, pos, noside);
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result = rust_range (expect_type, exp, noside, kind, low, high);
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}
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break;
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case UNOP_ADDR:
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/* We might have &array[range], in which case we need to make a
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slice. */
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if (exp->elts[*pos + 1].opcode == BINOP_SUBSCRIPT)
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{
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++*pos;
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++*pos;
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struct value *lhs = evaluate_subexp (nullptr, exp, pos, noside);
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struct value *rhs = evaluate_subexp (nullptr, exp, pos, noside);
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result = rust_subscript (expect_type, exp, noside, true, lhs, rhs);
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break;
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}
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/* Fall through. */
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default:
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result = evaluate_subexp_standard (expect_type, exp, pos, noside);
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break;
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}
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return result;
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}
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namespace expr
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{
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@ -1746,9 +1461,7 @@ rust_aggregate_operation::evaluate (struct type *expect_type,
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}
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}
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if (noside == EVAL_SKIP)
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result = value_from_longest (builtin_type (exp->gdbarch)->builtin_int, 1);
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else if (noside == EVAL_AVOID_SIDE_EFFECTS)
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if (noside == EVAL_AVOID_SIDE_EFFECTS)
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result = allocate_value (type);
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else
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result = value_at_lazy (type, addr);
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@ -1808,226 +1521,8 @@ rust_structop::evaluate_funcall (struct type *expect_type,
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}
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/* operator_length implementation for Rust. */
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static void
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rust_operator_length (const struct expression *exp, int pc, int *oplenp,
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int *argsp)
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{
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int oplen = 1;
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int args = 0;
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switch (exp->elts[pc - 1].opcode)
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{
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case OP_AGGREGATE:
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/* We handle aggregate as a type and argument count. The first
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argument might be OP_OTHERS. After that the arguments
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alternate: first an OP_NAME, then an expression. */
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oplen = 4;
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args = longest_to_int (exp->elts[pc - 2].longconst);
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break;
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case OP_OTHERS:
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oplen = 1;
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args = 1;
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break;
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case STRUCTOP_ANONYMOUS:
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oplen = 3;
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args = 1;
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break;
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case OP_RUST_ARRAY:
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oplen = 1;
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args = 2;
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break;
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default:
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operator_length_standard (exp, pc, oplenp, argsp);
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return;
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}
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*oplenp = oplen;
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*argsp = args;
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}
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/* dump_subexp_body implementation for Rust. */
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static int
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rust_dump_subexp_body (struct expression *exp, struct ui_file *stream,
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int elt)
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{
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switch (exp->elts[elt].opcode)
|
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{
|
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case OP_AGGREGATE:
|
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{
|
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int length = longest_to_int (exp->elts[elt + 2].longconst);
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int i;
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fprintf_filtered (stream, "Type @");
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gdb_print_host_address (exp->elts[elt + 1].type, stream);
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fprintf_filtered (stream, " (");
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type_print (exp->elts[elt + 1].type, NULL, stream, 0);
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fprintf_filtered (stream, "), length %d", length);
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elt += 4;
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for (i = 0; i < length; ++i)
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elt = dump_subexp (exp, stream, elt);
|
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}
|
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break;
|
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|
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case OP_STRING:
|
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case OP_NAME:
|
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{
|
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LONGEST len = exp->elts[elt + 1].longconst;
|
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fprintf_filtered (stream, "%s: %s",
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(exp->elts[elt].opcode == OP_STRING
|
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? "string" : "name"),
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&exp->elts[elt + 2].string);
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elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
|
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}
|
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break;
|
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|
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case OP_OTHERS:
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elt = dump_subexp (exp, stream, elt + 1);
|
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break;
|
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|
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case STRUCTOP_ANONYMOUS:
|
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{
|
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int field_number;
|
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|
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field_number = longest_to_int (exp->elts[elt + 1].longconst);
|
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|
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fprintf_filtered (stream, "Field number: %d", field_number);
|
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elt = dump_subexp (exp, stream, elt + 3);
|
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}
|
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break;
|
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|
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case OP_RUST_ARRAY:
|
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++elt;
|
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break;
|
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|
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default:
|
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elt = dump_subexp_body_standard (exp, stream, elt);
|
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break;
|
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}
|
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|
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return elt;
|
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}
|
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|
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/* print_subexp implementation for Rust. */
|
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|
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static void
|
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rust_print_subexp (struct expression *exp, int *pos, struct ui_file *stream,
|
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enum precedence prec)
|
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{
|
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switch (exp->elts[*pos].opcode)
|
||||
{
|
||||
case OP_AGGREGATE:
|
||||
{
|
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int length = longest_to_int (exp->elts[*pos + 2].longconst);
|
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int i;
|
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|
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type_print (exp->elts[*pos + 1].type, "", stream, 0);
|
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fputs_filtered (" { ", stream);
|
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|
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*pos += 4;
|
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for (i = 0; i < length; ++i)
|
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{
|
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rust_print_subexp (exp, pos, stream, prec);
|
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fputs_filtered (", ", stream);
|
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}
|
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fputs_filtered (" }", stream);
|
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}
|
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break;
|
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|
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case OP_NAME:
|
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{
|
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LONGEST len = exp->elts[*pos + 1].longconst;
|
||||
|
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fputs_filtered (&exp->elts[*pos + 2].string, stream);
|
||||
*pos += 4 + BYTES_TO_EXP_ELEM (len + 1);
|
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}
|
||||
break;
|
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|
||||
case OP_OTHERS:
|
||||
{
|
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fputs_filtered ("<<others>> (", stream);
|
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++*pos;
|
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rust_print_subexp (exp, pos, stream, prec);
|
||||
fputs_filtered (")", stream);
|
||||
}
|
||||
break;
|
||||
|
||||
case STRUCTOP_ANONYMOUS:
|
||||
{
|
||||
int tem = longest_to_int (exp->elts[*pos + 1].longconst);
|
||||
|
||||
(*pos) += 3;
|
||||
print_subexp (exp, pos, stream, PREC_SUFFIX);
|
||||
fprintf_filtered (stream, ".%d", tem);
|
||||
}
|
||||
break;
|
||||
|
||||
case OP_RUST_ARRAY:
|
||||
++*pos;
|
||||
fprintf_filtered (stream, "[");
|
||||
rust_print_subexp (exp, pos, stream, prec);
|
||||
fprintf_filtered (stream, "; ");
|
||||
rust_print_subexp (exp, pos, stream, prec);
|
||||
fprintf_filtered (stream, "]");
|
||||
break;
|
||||
|
||||
default:
|
||||
print_subexp_standard (exp, pos, stream, prec);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
/* operator_check implementation for Rust. */
|
||||
|
||||
static int
|
||||
rust_operator_check (struct expression *exp, int pos,
|
||||
int (*objfile_func) (struct objfile *objfile,
|
||||
void *data),
|
||||
void *data)
|
||||
{
|
||||
switch (exp->elts[pos].opcode)
|
||||
{
|
||||
case OP_AGGREGATE:
|
||||
{
|
||||
struct type *type = exp->elts[pos + 1].type;
|
||||
struct objfile *objfile = type->objfile_owner ();
|
||||
|
||||
if (objfile != NULL && (*objfile_func) (objfile, data))
|
||||
return 1;
|
||||
}
|
||||
break;
|
||||
|
||||
case OP_OTHERS:
|
||||
case OP_NAME:
|
||||
case OP_RUST_ARRAY:
|
||||
break;
|
||||
|
||||
default:
|
||||
return operator_check_standard (exp, pos, objfile_func, data);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
|
||||
const struct exp_descriptor rust_language::exp_descriptor_tab =
|
||||
{
|
||||
rust_print_subexp,
|
||||
rust_operator_length,
|
||||
rust_operator_check,
|
||||
rust_dump_subexp_body,
|
||||
rust_evaluate_subexp
|
||||
};
|
||||
|
||||
/* See language.h. */
|
||||
|
||||
void
|
||||
|
||||
Reference in New Issue
Block a user