#include "user-regs.h"
#include <algorithm>
#include "gdbsupport/gdb_optional.h"
+#include "c-exp.h"
-/* Standard set of definitions for printing, dumping, prefixifying,
- * and evaluating expressions. */
-
-const struct exp_descriptor exp_descriptor_standard =
- {
- print_subexp_standard,
- operator_length_standard,
- operator_check_standard,
- dump_subexp_body_standard,
- evaluate_subexp_standard
- };
-\f
static unsigned int expressiondebug = 0;
static void
show_expressiondebug (struct ui_file *file, int from_tty,
}
-static int prefixify_subexp (struct expression *, struct expression *, int,
- int, int);
-
static expression_up parse_exp_in_context (const char **, CORE_ADDR,
const struct block *, int,
- bool, int *,
- innermost_block_tracker *,
+ bool, innermost_block_tracker *,
expr_completion_state *);
-static void increase_expout_size (struct expr_builder *ps, size_t lenelt);
-
-
/* Documented at it's declaration. */
void
\f
-/* See definition in parser-defs.h. */
-
-expr_builder::expr_builder (const struct language_defn *lang,
- struct gdbarch *gdbarch)
- : expout_size (10),
- expout (new expression (lang, gdbarch, expout_size)),
- expout_ptr (0)
-{
-}
-
-expression_up
-expr_builder::release ()
-{
- /* Record the actual number of expression elements, and then
- reallocate the expression memory so that we free up any
- excess elements. */
-
- expout->nelts = expout_ptr;
- expout->resize (expout_ptr);
-
- return std::move (expout);
-}
-
-expression::expression (const struct language_defn *lang, struct gdbarch *arch,
- size_t n)
- : language_defn (lang),
- gdbarch (arch),
- elts (nullptr)
-{
- resize (n);
-}
-
-expression::~expression ()
-{
- xfree (elts);
-}
-
-void
-expression::resize (size_t n)
-{
- elts = XRESIZEVAR (union exp_element, elts, EXP_ELEM_TO_BYTES (n));
-}
-
-/* This page contains the functions for adding data to the struct expression
- being constructed. */
-
-/* Add one element to the end of the expression. */
-
-/* To avoid a bug in the Sun 4 compiler, we pass things that can fit into
- a register through here. */
-
-static void
-write_exp_elt (struct expr_builder *ps, const union exp_element *expelt)
-{
- if (ps->expout_ptr >= ps->expout_size)
- {
- ps->expout_size *= 2;
- ps->expout->resize (ps->expout_size);
- }
- ps->expout->elts[ps->expout_ptr++] = *expelt;
-}
-
-void
-write_exp_elt_opcode (struct expr_builder *ps, enum exp_opcode expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.opcode = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_sym (struct expr_builder *ps, struct symbol *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.symbol = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-static void
-write_exp_elt_msym (struct expr_builder *ps, minimal_symbol *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.msymbol = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_block (struct expr_builder *ps, const struct block *b)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.block = b;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_objfile (struct expr_builder *ps, struct objfile *objfile)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.objfile = objfile;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_longcst (struct expr_builder *ps, LONGEST expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.longconst = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_floatcst (struct expr_builder *ps, const gdb_byte expelt[16])
-{
- union exp_element tmp;
- int index;
-
- for (index = 0; index < 16; index++)
- tmp.floatconst[index] = expelt[index];
-
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_type (struct expr_builder *ps, struct type *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.type = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_intern (struct expr_builder *ps, struct internalvar *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.internalvar = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-/* Add a string constant to the end of the expression.
-
- String constants are stored by first writing an expression element
- that contains the length of the string, then stuffing the string
- constant itself into however many expression elements are needed
- to hold it, and then writing another expression element that contains
- the length of the string. I.e. an expression element at each end of
- the string records the string length, so you can skip over the
- expression elements containing the actual string bytes from either
- end of the string. Note that this also allows gdb to handle
- strings with embedded null bytes, as is required for some languages.
-
- Don't be fooled by the fact that the string is null byte terminated,
- this is strictly for the convenience of debugging gdb itself.
- Gdb does not depend up the string being null terminated, since the
- actual length is recorded in expression elements at each end of the
- string. The null byte is taken into consideration when computing how
- many expression elements are required to hold the string constant, of
- course. */
-
-
-void
-write_exp_string (struct expr_builder *ps, struct stoken str)
-{
- int len = str.length;
- size_t lenelt;
- char *strdata;
-
- /* Compute the number of expression elements required to hold the string
- (including a null byte terminator), along with one expression element
- at each end to record the actual string length (not including the
- null byte terminator). */
-
- lenelt = 2 + BYTES_TO_EXP_ELEM (len + 1);
-
- increase_expout_size (ps, lenelt);
-
- /* Write the leading length expression element (which advances the current
- expression element index), then write the string constant followed by a
- terminating null byte, and then write the trailing length expression
- element. */
-
- write_exp_elt_longcst (ps, (LONGEST) len);
- strdata = (char *) &ps->expout->elts[ps->expout_ptr];
- memcpy (strdata, str.ptr, len);
- *(strdata + len) = '\0';
- ps->expout_ptr += lenelt - 2;
- write_exp_elt_longcst (ps, (LONGEST) len);
-}
-
-/* Add a vector of string constants to the end of the expression.
-
- This adds an OP_STRING operation, but encodes the contents
- differently from write_exp_string. The language is expected to
- handle evaluation of this expression itself.
-
- After the usual OP_STRING header, TYPE is written into the
- expression as a long constant. The interpretation of this field is
- up to the language evaluator.
-
- Next, each string in VEC is written. The length is written as a
- long constant, followed by the contents of the string. */
-
-void
-write_exp_string_vector (struct expr_builder *ps, int type,
- struct stoken_vector *vec)
-{
- int i, len;
- size_t n_slots;
-
- /* Compute the size. We compute the size in number of slots to
- avoid issues with string padding. */
- n_slots = 0;
- for (i = 0; i < vec->len; ++i)
- {
- /* One slot for the length of this element, plus the number of
- slots needed for this string. */
- n_slots += 1 + BYTES_TO_EXP_ELEM (vec->tokens[i].length);
- }
-
- /* One more slot for the type of the string. */
- ++n_slots;
-
- /* Now compute a phony string length. */
- len = EXP_ELEM_TO_BYTES (n_slots) - 1;
-
- n_slots += 4;
- increase_expout_size (ps, n_slots);
-
- write_exp_elt_opcode (ps, OP_STRING);
- write_exp_elt_longcst (ps, len);
- write_exp_elt_longcst (ps, type);
-
- for (i = 0; i < vec->len; ++i)
- {
- write_exp_elt_longcst (ps, vec->tokens[i].length);
- memcpy (&ps->expout->elts[ps->expout_ptr], vec->tokens[i].ptr,
- vec->tokens[i].length);
- ps->expout_ptr += BYTES_TO_EXP_ELEM (vec->tokens[i].length);
- }
-
- write_exp_elt_longcst (ps, len);
- write_exp_elt_opcode (ps, OP_STRING);
-}
-
-/* Add a bitstring constant to the end of the expression.
-
- Bitstring constants are stored by first writing an expression element
- that contains the length of the bitstring (in bits), then stuffing the
- bitstring constant itself into however many expression elements are
- needed to hold it, and then writing another expression element that
- contains the length of the bitstring. I.e. an expression element at
- each end of the bitstring records the bitstring length, so you can skip
- over the expression elements containing the actual bitstring bytes from
- either end of the bitstring. */
-
-void
-write_exp_bitstring (struct expr_builder *ps, struct stoken str)
-{
- int bits = str.length; /* length in bits */
- int len = (bits + HOST_CHAR_BIT - 1) / HOST_CHAR_BIT;
- size_t lenelt;
- char *strdata;
-
- /* Compute the number of expression elements required to hold the bitstring,
- along with one expression element at each end to record the actual
- bitstring length in bits. */
-
- lenelt = 2 + BYTES_TO_EXP_ELEM (len);
-
- increase_expout_size (ps, lenelt);
-
- /* Write the leading length expression element (which advances the current
- expression element index), then write the bitstring constant, and then
- write the trailing length expression element. */
-
- write_exp_elt_longcst (ps, (LONGEST) bits);
- strdata = (char *) &ps->expout->elts[ps->expout_ptr];
- memcpy (strdata, str.ptr, len);
- ps->expout_ptr += lenelt - 2;
- write_exp_elt_longcst (ps, (LONGEST) bits);
-}
-
/* Return the type of MSYMBOL, a minimal symbol of OBJFILE. If
ADDRESS_P is not NULL, set it to the MSYMBOL's resolved
address. */
}
}
-/* Add the appropriate elements for a minimal symbol to the end of
- the expression. */
-
-void
-write_exp_msymbol (struct expr_builder *ps,
- struct bound_minimal_symbol bound_msym)
-{
- write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE);
- write_exp_elt_objfile (ps, bound_msym.objfile);
- write_exp_elt_msym (ps, bound_msym.minsym);
- write_exp_elt_opcode (ps, OP_VAR_MSYM_VALUE);
-}
-
/* See parser-defs.h. */
void
-parser_state::mark_struct_expression ()
+parser_state::mark_struct_expression (expr::structop_base_operation *op)
{
gdb_assert (parse_completion
&& (m_completion_state.expout_tag_completion_type
== TYPE_CODE_UNDEF));
- m_completion_state.expout_last_struct = expout_ptr;
+ m_completion_state.expout_last_op = op;
}
/* Indicate that the current parser invocation is completing a tag.
&& (m_completion_state.expout_tag_completion_type
== TYPE_CODE_UNDEF)
&& m_completion_state.expout_completion_name == NULL
- && m_completion_state.expout_last_struct == -1);
+ && m_completion_state.expout_last_op == nullptr);
gdb_assert (tag == TYPE_CODE_UNION
|| tag == TYPE_CODE_STRUCT
|| tag == TYPE_CODE_ENUM);
m_completion_state.expout_completion_name.reset (xstrndup (ptr, length));
}
-\f
-/* Recognize tokens that start with '$'. These include:
-
- $regname A native register name or a "standard
- register name".
+/* See parser-defs.h. */
- $variable A convenience variable with a name chosen
- by the user.
+void
+parser_state::push_c_string (int kind, struct stoken_vector *vec)
+{
+ std::vector<std::string> data (vec->len);
+ for (int i = 0; i < vec->len; ++i)
+ data[i] = std::string (vec->tokens[i].ptr, vec->tokens[i].length);
- $digits Value history with index <digits>, starting
- from the first value which has index 1.
+ push_new<expr::c_string_operation> ((enum c_string_type_values) kind,
+ std::move (data));
+}
- $$digits Value history with index <digits> relative
- to the last value. I.e. $$0 is the last
- value, $$1 is the one previous to that, $$2
- is the one previous to $$1, etc.
+/* See parser-defs.h. */
- $ | $0 | $$0 The last value in the value history.
+void
+parser_state::push_symbol (const char *name, block_symbol sym)
+{
+ if (sym.symbol != nullptr)
+ {
+ if (symbol_read_needs_frame (sym.symbol))
+ block_tracker->update (sym);
+ push_new<expr::var_value_operation> (sym);
+ }
+ else
+ {
+ struct bound_minimal_symbol msymbol = lookup_bound_minimal_symbol (name);
+ if (msymbol.minsym != NULL)
+ push_new<expr::var_msym_value_operation> (msymbol);
+ else if (!have_full_symbols () && !have_partial_symbols ())
+ error (_("No symbol table is loaded. Use the \"file\" command."));
+ else
+ error (_("No symbol \"%s\" in current context."), name);
+ }
+}
- $$ An abbreviation for the second to the last
- value in the value history, I.e. $$1 */
+/* See parser-defs.h. */
void
-write_dollar_variable (struct parser_state *ps, struct stoken str)
+parser_state::push_dollar (struct stoken str)
{
struct block_symbol sym;
struct bound_minimal_symbol msym;
/* Handle tokens that refer to machine registers:
$ followed by a register name. */
- i = user_reg_map_name_to_regnum (ps->gdbarch (),
+ i = user_reg_map_name_to_regnum (gdbarch (),
str.ptr + 1, str.length - 1);
if (i >= 0)
goto handle_register;
isym = lookup_only_internalvar (copy.c_str () + 1);
if (isym)
{
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
- write_exp_elt_intern (ps, isym);
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ push_new<expr::internalvar_operation> (isym);
return;
}
- /* On some systems, such as HP-UX and hppa-linux, certain system routines
+ /* On some systems, such as HP-UX and hppa-linux, certain system routines
have names beginning with $ or $$. Check for those, first. */
sym = lookup_symbol (copy.c_str (), NULL, VAR_DOMAIN, NULL);
if (sym.symbol)
{
- write_exp_elt_opcode (ps, OP_VAR_VALUE);
- write_exp_elt_block (ps, sym.block);
- write_exp_elt_sym (ps, sym.symbol);
- write_exp_elt_opcode (ps, OP_VAR_VALUE);
+ push_new<expr::var_value_operation> (sym);
return;
}
msym = lookup_bound_minimal_symbol (copy.c_str ());
if (msym.minsym)
{
- write_exp_msymbol (ps, msym);
+ push_new<expr::var_msym_value_operation> (msym);
return;
}
/* Any other names are assumed to be debugger internal variables. */
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
- write_exp_elt_intern (ps, create_internalvar (copy.c_str () + 1));
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ push_new<expr::internalvar_operation>
+ (create_internalvar (copy.c_str () + 1));
return;
handle_last:
- write_exp_elt_opcode (ps, OP_LAST);
- write_exp_elt_longcst (ps, (LONGEST) i);
- write_exp_elt_opcode (ps, OP_LAST);
+ push_new<expr::last_operation> (i);
return;
handle_register:
- write_exp_elt_opcode (ps, OP_REGISTER);
str.length--;
str.ptr++;
- write_exp_string (ps, str);
- write_exp_elt_opcode (ps, OP_REGISTER);
- ps->block_tracker->update (ps->expression_context_block,
- INNERMOST_BLOCK_FOR_REGISTERS);
+ push_new<expr::register_operation> (copy_name (str));
+ block_tracker->update (expression_context_block,
+ INNERMOST_BLOCK_FOR_REGISTERS);
return;
}
-/* See parser-defs.h. */
-
-void
-write_exp_symbol_reference (struct parser_state *pstate, const char *name,
- struct block_symbol sym)
-{
- if (sym.symbol != nullptr)
- {
- if (symbol_read_needs_frame (sym.symbol))
- pstate->block_tracker->update (sym);
- write_exp_elt_opcode (pstate, OP_VAR_VALUE);
- write_exp_elt_block (pstate, sym.block);
- write_exp_elt_sym (pstate, sym.symbol);
- write_exp_elt_opcode (pstate, OP_VAR_VALUE);
- }
- else
- {
- struct bound_minimal_symbol msymbol = lookup_bound_minimal_symbol (name);
- if (msymbol.minsym != NULL)
- write_exp_msymbol (pstate, msymbol);
- else if (!have_full_symbols () && !have_partial_symbols ())
- error (_("No symbol table is loaded. Use the \"file\" command."));
- else
- error (_("No symbol \"%s\" in current context."), name);
- }
-}
+\f
const char *
find_template_name_end (const char *p)
}
\f
-/* See comments on parser-defs.h. */
-
-int
-prefixify_expression (struct expression *expr, int last_struct)
-{
- gdb_assert (expr->nelts > 0);
- int len = EXP_ELEM_TO_BYTES (expr->nelts);
- struct expression temp (expr->language_defn, expr->gdbarch, expr->nelts);
- int inpos = expr->nelts, outpos = 0;
-
- /* Copy the original expression into temp. */
- memcpy (temp.elts, expr->elts, len);
-
- return prefixify_subexp (&temp, expr, inpos, outpos, last_struct);
-}
-
-/* Return the number of exp_elements in the postfix subexpression
- of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
-
-static int
-length_of_subexp (struct expression *expr, int endpos)
-{
- int oplen, args;
-
- operator_length (expr, endpos, &oplen, &args);
-
- while (args > 0)
- {
- oplen += length_of_subexp (expr, endpos - oplen);
- args--;
- }
-
- return oplen;
-}
-
-/* Sets *OPLENP to the length of the operator whose (last) index is
- ENDPOS - 1 in EXPR, and sets *ARGSP to the number of arguments that
- operator takes. */
-
-void
-operator_length (const struct expression *expr, int endpos, int *oplenp,
- int *argsp)
-{
- expr->language_defn->expression_ops ()->operator_length (expr, endpos,
- oplenp, argsp);
-}
-
-/* Default value for operator_length in exp_descriptor vectors. */
-
-void
-operator_length_standard (const struct expression *expr, int endpos,
- int *oplenp, int *argsp)
-{
- int oplen = 1;
- int args = 0;
- enum range_flag range_flag;
- int i;
-
- if (endpos < 1)
- error (_("?error in operator_length_standard"));
-
- i = (int) expr->elts[endpos - 1].opcode;
-
- switch (i)
- {
- /* C++ */
- case OP_SCOPE:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 5 + BYTES_TO_EXP_ELEM (oplen + 1);
- break;
-
- case OP_LONG:
- case OP_FLOAT:
- case OP_VAR_VALUE:
- case OP_VAR_MSYM_VALUE:
- oplen = 4;
- break;
-
- case OP_FUNC_STATIC_VAR:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- args = 1;
- break;
-
- case OP_TYPE:
- case OP_BOOL:
- case OP_LAST:
- case OP_INTERNALVAR:
- case OP_VAR_ENTRY_VALUE:
- oplen = 3;
- break;
-
- case OP_COMPLEX:
- oplen = 3;
- args = 2;
- break;
-
- case OP_FUNCALL:
- oplen = 3;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case TYPE_INSTANCE:
- oplen = 5 + longest_to_int (expr->elts[endpos - 2].longconst);
- args = 1;
- break;
-
- case OP_OBJC_MSGCALL: /* Objective C message (method) call. */
- oplen = 4;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case UNOP_MAX:
- case UNOP_MIN:
- oplen = 3;
- break;
-
- case UNOP_CAST_TYPE:
- case UNOP_DYNAMIC_CAST:
- case UNOP_REINTERPRET_CAST:
- case UNOP_MEMVAL_TYPE:
- oplen = 1;
- args = 2;
- break;
-
- case BINOP_VAL:
- case UNOP_CAST:
- case UNOP_MEMVAL:
- oplen = 3;
- args = 1;
- break;
-
- case UNOP_ABS:
- case UNOP_CAP:
- case UNOP_CHR:
- case UNOP_FLOAT:
- case UNOP_HIGH:
- case UNOP_ODD:
- case UNOP_ORD:
- case UNOP_TRUNC:
- case OP_TYPEOF:
- case OP_DECLTYPE:
- case OP_TYPEID:
- oplen = 1;
- args = 1;
- break;
-
- case OP_ADL_FUNC:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- oplen++;
- oplen++;
- break;
-
- case STRUCTOP_STRUCT:
- case STRUCTOP_PTR:
- args = 1;
- /* fall through */
- case OP_REGISTER:
- case OP_M2_STRING:
- case OP_STRING:
- case OP_OBJC_NSSTRING: /* Objective C Foundation Class
- NSString constant. */
- case OP_OBJC_SELECTOR: /* Objective C "@selector" pseudo-op. */
- case OP_NAME:
- oplen = longest_to_int (expr->elts[endpos - 2].longconst);
- oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
- break;
-
- case OP_ARRAY:
- oplen = 4;
- args = longest_to_int (expr->elts[endpos - 2].longconst);
- args -= longest_to_int (expr->elts[endpos - 3].longconst);
- args += 1;
- break;
-
- case TERNOP_COND:
- case TERNOP_SLICE:
- args = 3;
- break;
-
- /* Modula-2 */
- case MULTI_SUBSCRIPT:
- oplen = 3;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case BINOP_ASSIGN_MODIFY:
- oplen = 3;
- args = 2;
- break;
-
- /* C++ */
- case OP_THIS:
- oplen = 2;
- break;
-
- case OP_RANGE:
- oplen = 3;
- range_flag = (enum range_flag)
- longest_to_int (expr->elts[endpos - 2].longconst);
-
- /* Assume the range has 2 arguments (low bound and high bound), then
- reduce the argument count if any bounds are set to default. */
- args = 2;
- if (range_flag & RANGE_HAS_STRIDE)
- ++args;
- if (range_flag & RANGE_LOW_BOUND_DEFAULT)
- --args;
- if (range_flag & RANGE_HIGH_BOUND_DEFAULT)
- --args;
-
- break;
-
- default:
- args = 1 + (i < (int) BINOP_END);
- }
-
- *oplenp = oplen;
- *argsp = args;
-}
-
-/* Copy the subexpression ending just before index INEND in INEXPR
- into OUTEXPR, starting at index OUTBEG.
- In the process, convert it from suffix to prefix form.
- If LAST_STRUCT is -1, then this function always returns -1.
- Otherwise, it returns the index of the subexpression which is the
- left-hand-side of the expression at LAST_STRUCT. */
-
-static int
-prefixify_subexp (struct expression *inexpr,
- struct expression *outexpr, int inend, int outbeg,
- int last_struct)
-{
- int oplen;
- int args;
- int i;
- int *arglens;
- int result = -1;
-
- operator_length (inexpr, inend, &oplen, &args);
-
- /* Copy the final operator itself, from the end of the input
- to the beginning of the output. */
- inend -= oplen;
- memcpy (&outexpr->elts[outbeg], &inexpr->elts[inend],
- EXP_ELEM_TO_BYTES (oplen));
- outbeg += oplen;
-
- if (last_struct == inend)
- result = outbeg - oplen;
-
- /* Find the lengths of the arg subexpressions. */
- arglens = (int *) alloca (args * sizeof (int));
- for (i = args - 1; i >= 0; i--)
- {
- oplen = length_of_subexp (inexpr, inend);
- arglens[i] = oplen;
- inend -= oplen;
- }
-
- /* Now copy each subexpression, preserving the order of
- the subexpressions, but prefixifying each one.
- In this loop, inend starts at the beginning of
- the expression this level is working on
- and marches forward over the arguments.
- outbeg does similarly in the output. */
- for (i = 0; i < args; i++)
- {
- int r;
-
- oplen = arglens[i];
- inend += oplen;
- r = prefixify_subexp (inexpr, outexpr, inend, outbeg, last_struct);
- if (r != -1)
- {
- /* Return immediately. We probably have only parsed a
- partial expression, so we don't want to try to reverse
- the other operands. */
- return r;
- }
- outbeg += oplen;
- }
-
- return result;
-}
-\f
/* Read an expression from the string *STRINGPTR points to,
parse it, and return a pointer to a struct expression that we malloc.
Use block BLOCK as the lexical context for variable names;
parse_exp_1 (const char **stringptr, CORE_ADDR pc, const struct block *block,
int comma, innermost_block_tracker *tracker)
{
- return parse_exp_in_context (stringptr, pc, block, comma, false, NULL,
+ return parse_exp_in_context (stringptr, pc, block, comma, false,
tracker, nullptr);
}
/* As for parse_exp_1, except that if VOID_CONTEXT_P, then
- no value is expected from the expression.
- OUT_SUBEXP is set when attempting to complete a field name; in this
- case it is set to the index of the subexpression on the
- left-hand-side of the struct op. If not doing such completion, it
- is left untouched. */
+ no value is expected from the expression. */
static expression_up
parse_exp_in_context (const char **stringptr, CORE_ADDR pc,
const struct block *block,
- int comma, bool void_context_p, int *out_subexp,
+ int comma, bool void_context_p,
innermost_block_tracker *tracker,
expr_completion_state *cstate)
{
const struct language_defn *lang = NULL;
- int subexp;
if (*stringptr == 0 || **stringptr == 0)
error_no_arg (_("expression to compute"));
/* If parsing for completion, allow this to succeed; but if no
expression elements have been written, then there's nothing
to do, so fail. */
- if (! ps.parse_completion || ps.expout_ptr == 0)
+ if (! ps.parse_completion || ps.expout->op == nullptr)
throw;
}
- /* We have to operate on an "expression *", due to la_post_parser,
- which explains this funny-looking double release. */
expression_up result = ps.release ();
-
- /* Convert expression from postfix form as generated by yacc
- parser, to a prefix form. */
-
- if (expressiondebug)
- dump_raw_expression (result.get (), gdb_stdlog,
- "before conversion to prefix form");
-
- subexp = prefixify_expression (result.get (),
- ps.m_completion_state.expout_last_struct);
- if (out_subexp)
- *out_subexp = subexp;
-
- lang->post_parser (&result, &ps);
+ result->op->set_outermost ();
if (expressiondebug)
dump_prefix_expression (result.get (), gdb_stdlog);
bool void_context_p)
{
expression_up exp = parse_exp_in_context (&string, 0, nullptr, 0,
- void_context_p, nullptr,
+ void_context_p,
tracker, nullptr);
if (*string)
error (_("Junk after end of expression."));
enum type_code *code)
{
expression_up exp;
- struct value *val;
- int subexp;
expr_completion_state cstate;
try
{
- exp = parse_exp_in_context (&string, 0, 0, 0, false, &subexp,
- nullptr, &cstate);
+ exp = parse_exp_in_context (&string, 0, 0, 0, false, nullptr, &cstate);
}
catch (const gdb_exception_error &except)
{
return NULL;
}
- if (cstate.expout_last_struct == -1)
- return NULL;
-
- const char *fieldname = extract_field_op (exp.get (), &subexp);
- if (fieldname == NULL)
- {
- name->reset ();
- return NULL;
- }
-
- name->reset (xstrdup (fieldname));
- /* This might throw an exception. If so, we want to let it
- propagate. */
- val = evaluate_subexpression_type (exp.get (), subexp);
+ if (cstate.expout_last_op == nullptr)
+ return nullptr;
- return value_type (val);
+ expr::structop_base_operation *op = cstate.expout_last_op;
+ const std::string &fld = op->get_string ();
+ *name = make_unique_xstrdup (fld.c_str ());
+ return value_type (op->evaluate_lhs (exp.get ()));
}
/* Parse floating point value P of length LEN.
va_end (args);
}
-/* Implementation of the exp_descriptor method operator_check. */
-
-int
-operator_check_standard (struct expression *exp, int pos,
- int (*objfile_func) (struct objfile *objfile,
- void *data),
- void *data)
-{
- const union exp_element *const elts = exp->elts;
- struct type *type = NULL;
- struct objfile *objfile = NULL;
-
- /* Extended operators should have been already handled by exp_descriptor
- iterate method of its specific language. */
- gdb_assert (elts[pos].opcode < OP_EXTENDED0);
-
- /* Track the callers of write_exp_elt_type for this table. */
-
- switch (elts[pos].opcode)
- {
- case BINOP_VAL:
- case OP_COMPLEX:
- case OP_FLOAT:
- case OP_LONG:
- case OP_SCOPE:
- case OP_TYPE:
- case UNOP_CAST:
- case UNOP_MAX:
- case UNOP_MEMVAL:
- case UNOP_MIN:
- type = elts[pos + 1].type;
- break;
-
- case TYPE_INSTANCE:
- {
- LONGEST arg, nargs = elts[pos + 2].longconst;
-
- for (arg = 0; arg < nargs; arg++)
- {
- struct type *inst_type = elts[pos + 3 + arg].type;
- struct objfile *inst_objfile = inst_type->objfile_owner ();
-
- if (inst_objfile && (*objfile_func) (inst_objfile, data))
- return 1;
- }
- }
- break;
-
- case OP_VAR_VALUE:
- {
- const struct block *const block = elts[pos + 1].block;
- const struct symbol *const symbol = elts[pos + 2].symbol;
+/* Return rue if EXP uses OBJFILE (and will become dangling when
+ OBJFILE is unloaded), otherwise return false. OBJFILE must not be
+ a separate debug info file. */
- /* Check objfile where the variable itself is placed. */
- if ((*objfile_func) (symbol_objfile (symbol), data))
- return 1;
-
- /* Check objfile where is placed the code touching the variable. */
- objfile = block_objfile (block);
-
- type = SYMBOL_TYPE (symbol);
- }
- break;
- case OP_VAR_MSYM_VALUE:
- objfile = elts[pos + 1].objfile;
- break;
- }
-
- /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
-
- if (type != nullptr && type->objfile_owner () != nullptr
- && objfile_func (type->objfile_owner (), data))
- return 1;
-
- if (objfile && (*objfile_func) (objfile, data))
- return 1;
-
- return 0;
-}
-
-/* Call OBJFILE_FUNC for any objfile found being referenced by EXP.
- OBJFILE_FUNC is never called with NULL OBJFILE. OBJFILE_FUNC get
- passed an arbitrary caller supplied DATA pointer. If OBJFILE_FUNC
- returns non-zero value then (any other) non-zero value is immediately
- returned to the caller. Otherwise zero is returned after iterating
- through whole EXP. */
-
-static int
-exp_iterate (struct expression *exp,
- int (*objfile_func) (struct objfile *objfile, void *data),
- void *data)
-{
- int endpos;
-
- for (endpos = exp->nelts; endpos > 0; )
- {
- int pos, args, oplen = 0;
-
- operator_length (exp, endpos, &oplen, &args);
- gdb_assert (oplen > 0);
-
- pos = endpos - oplen;
- if (exp->language_defn->expression_ops ()->operator_check (exp, pos,
- objfile_func,
- data))
- return 1;
-
- endpos = pos;
- }
-
- return 0;
-}
-
-/* Helper for exp_uses_objfile. */
-
-static int
-exp_uses_objfile_iter (struct objfile *exp_objfile, void *objfile_voidp)
-{
- struct objfile *objfile = (struct objfile *) objfile_voidp;
-
- if (exp_objfile->separate_debug_objfile_backlink)
- exp_objfile = exp_objfile->separate_debug_objfile_backlink;
-
- return exp_objfile == objfile;
-}
-
-/* Return 1 if EXP uses OBJFILE (and will become dangling when OBJFILE
- is unloaded), otherwise return 0. OBJFILE must not be a separate debug info
- file. */
-
-int
+bool
exp_uses_objfile (struct expression *exp, struct objfile *objfile)
{
gdb_assert (objfile->separate_debug_objfile_backlink == NULL);
- return exp_iterate (exp, exp_uses_objfile_iter, objfile);
-}
-
-/* Reallocate the `expout' pointer inside PS so that it can accommodate
- at least LENELT expression elements. This function does nothing if
- there is enough room for the elements. */
-
-static void
-increase_expout_size (struct expr_builder *ps, size_t lenelt)
-{
- if ((ps->expout_ptr + lenelt) >= ps->expout_size)
- {
- ps->expout_size = std::max (ps->expout_size * 2,
- ps->expout_ptr + lenelt + 10);
- ps->expout->resize (ps->expout_size);
- }
+ return exp->op->uses_objfile (objfile);
}
void _initialize_parse ();
projects / deliverable / binutils-gdb.git / blobdiff