/* Parse expressions for GDB.
- Copyright (C) 1986-2015 Free Software Foundation, Inc.
+ Copyright (C) 1986-2021 Free Software Foundation, Inc.
Modified from expread.y by the Department of Computer Science at the
State University of New York at Buffalo, 1991.
#include "value.h"
#include "command.h"
#include "language.h"
-#include "f-lang.h"
#include "parser-defs.h"
#include "gdbcmd.h"
#include "symfile.h" /* for overlay functions */
#include "inferior.h"
-#include "doublest.h"
+#include "target-float.h"
#include "block.h"
#include "source.h"
#include "objfiles.h"
#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,
- op_name_standard,
- dump_subexp_body_standard,
- evaluate_subexp_standard
- };
-\f
-/* Global variables declared in parser-defs.h (and commented there). */
-const struct block *expression_context_block;
-CORE_ADDR expression_context_pc;
-const struct block *innermost_block;
-int arglist_len;
-static struct type_stack type_stack;
-const char *lexptr;
-const char *prev_lexptr;
-int paren_depth;
-int comma_terminates;
-
-/* True if parsing an expression to attempt completion. */
-int parse_completion;
-
-/* The index of the last struct expression directly before a '.' or
- '->'. This is set when parsing and is only used when completing a
- field name. It is -1 if no dereference operation was found. */
-static int expout_last_struct = -1;
-
-/* If we are completing a tagged type name, this will be nonzero. */
-static enum type_code expout_tag_completion_type = TYPE_CODE_UNDEF;
-
-/* The token for tagged type name completion. */
-static char *expout_completion_name;
-
-\f
static unsigned int expressiondebug = 0;
static void
show_expressiondebug (struct ui_file *file, int from_tty,
}
-/* Non-zero if an expression parser should set yydebug. */
-int parser_debug;
+/* True if an expression parser should set yydebug. */
+bool parser_debug;
static void
show_parserdebug (struct ui_file *file, int from_tty,
}
-static void free_funcalls (void *ignore);
-
-static int prefixify_subexp (struct expression *, struct expression *, int,
- int);
-
-static struct expression *parse_exp_in_context (const char **, CORE_ADDR,
- const struct block *, int,
- int, int *);
-static struct expression *parse_exp_in_context_1 (const char **, CORE_ADDR,
- const struct block *, int,
- int, int *);
-
-void _initialize_parse (void);
-
-/* Data structure for saving values of arglist_len for function calls whose
- arguments contain other function calls. */
-
-struct funcall
- {
- struct funcall *next;
- int arglist_len;
- };
+static expression_up parse_exp_in_context (const char **, CORE_ADDR,
+ const struct block *, int,
+ bool, innermost_block_tracker *,
+ expr_completion_state *);
-static struct funcall *funcall_chain;
-
-/* Begin counting arguments for a function call,
- saving the data about any containing call. */
+/* Documented at it's declaration. */
void
-start_arglist (void)
+innermost_block_tracker::update (const struct block *b,
+ innermost_block_tracker_types t)
{
- struct funcall *newobj;
-
- newobj = XNEW (struct funcall);
- newobj->next = funcall_chain;
- newobj->arglist_len = arglist_len;
- arglist_len = 0;
- funcall_chain = newobj;
-}
-
-/* Return the number of arguments in a function call just terminated,
- and restore the data for the containing function call. */
-
-int
-end_arglist (void)
-{
- int val = arglist_len;
- struct funcall *call = funcall_chain;
-
- funcall_chain = call->next;
- arglist_len = call->arglist_len;
- xfree (call);
- return val;
+ if ((m_types & t) != 0
+ && (m_innermost_block == NULL
+ || contained_in (b, m_innermost_block)))
+ m_innermost_block = b;
}
-/* Free everything in the funcall chain.
- Used when there is an error inside parsing. */
-
-static void
-free_funcalls (void *ignore)
-{
- struct funcall *call, *next;
-
- for (call = funcall_chain; call; call = next)
- {
- next = call->next;
- xfree (call);
- }
-}
\f
-/* See definition in parser-defs.h. */
-
-void
-initialize_expout (struct parser_state *ps, size_t initial_size,
- const struct language_defn *lang,
- struct gdbarch *gdbarch)
-{
- ps->expout_size = initial_size;
- ps->expout_ptr = 0;
- ps->expout
- = (struct expression *) xmalloc (sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (ps->expout_size));
- ps->expout->language_defn = lang;
- ps->expout->gdbarch = gdbarch;
-}
-
-/* See definition in parser-defs.h. */
-
-void
-reallocate_expout (struct parser_state *ps)
-{
- /* Record the actual number of expression elements, and then
- reallocate the expression memory so that we free up any
- excess elements. */
-
- ps->expout->nelts = ps->expout_ptr;
- ps->expout = (struct expression *)
- xrealloc (ps->expout,
- sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (ps->expout_ptr));
-}
-
-/* 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 parser_state *ps, const union exp_element *expelt)
-{
- if (ps->expout_ptr >= ps->expout_size)
- {
- ps->expout_size *= 2;
- ps->expout = (struct expression *)
- xrealloc (ps->expout, sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (ps->expout_size));
- }
- ps->expout->elts[ps->expout_ptr++] = *expelt;
-}
-
-void
-write_exp_elt_opcode (struct parser_state *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 parser_state *ps, struct symbol *expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.symbol = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_block (struct parser_state *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 parser_state *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 parser_state *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_dblcst (struct parser_state *ps, DOUBLEST expelt)
-{
- union exp_element tmp;
-
- memset (&tmp, 0, sizeof (union exp_element));
- tmp.doubleconst = expelt;
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_decfloatcst (struct parser_state *ps, gdb_byte expelt[16])
-{
- union exp_element tmp;
- int index;
-
- for (index = 0; index < 16; index++)
- tmp.decfloatconst[index] = expelt[index];
-
- write_exp_elt (ps, &tmp);
-}
-
-void
-write_exp_elt_type (struct parser_state *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 parser_state *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 parser_state *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 parser_state *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 parser_state *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 parser_state *ps,
- struct bound_minimal_symbol bound_msym)
+type *
+find_minsym_type_and_address (minimal_symbol *msymbol,
+ struct objfile *objfile,
+ CORE_ADDR *address_p)
{
- struct minimal_symbol *msymbol = bound_msym.minsym;
- struct objfile *objfile = bound_msym.objfile;
- struct gdbarch *gdbarch = get_objfile_arch (objfile);
-
- CORE_ADDR addr = BMSYMBOL_VALUE_ADDRESS (bound_msym);
- struct obj_section *section = MSYMBOL_OBJ_SECTION (objfile, msymbol);
+ bound_minimal_symbol bound_msym = {msymbol, objfile};
+ struct obj_section *section = msymbol->obj_section (objfile);
enum minimal_symbol_type type = MSYMBOL_TYPE (msymbol);
- CORE_ADDR pc;
+
+ bool is_tls = (section != NULL
+ && section->the_bfd_section->flags & SEC_THREAD_LOCAL);
/* The minimal symbol might point to a function descriptor;
resolve it to the actual code address instead. */
- pc = gdbarch_convert_from_func_ptr_addr (gdbarch, addr, ¤t_target);
- if (pc != addr)
+ CORE_ADDR addr;
+ if (is_tls)
{
- struct bound_minimal_symbol ifunc_msym = lookup_minimal_symbol_by_pc (pc);
-
- /* In this case, assume we have a code symbol instead of
- a data symbol. */
-
- if (ifunc_msym.minsym != NULL
- && MSYMBOL_TYPE (ifunc_msym.minsym) == mst_text_gnu_ifunc
- && BMSYMBOL_VALUE_ADDRESS (ifunc_msym) == pc)
+ /* Addresses of TLS symbols are really offsets into a
+ per-objfile/per-thread storage block. */
+ addr = MSYMBOL_VALUE_RAW_ADDRESS (bound_msym.minsym);
+ }
+ else if (msymbol_is_function (objfile, msymbol, &addr))
+ {
+ if (addr != BMSYMBOL_VALUE_ADDRESS (bound_msym))
{
- /* A function descriptor has been resolved but PC is still in the
- STT_GNU_IFUNC resolver body (such as because inferior does not
- run to be able to call it). */
-
- type = mst_text_gnu_ifunc;
+ /* This means we resolved a function descriptor, and we now
+ have an address for a code/text symbol instead of a data
+ symbol. */
+ if (MSYMBOL_TYPE (msymbol) == mst_data_gnu_ifunc)
+ type = mst_text_gnu_ifunc;
+ else
+ type = mst_text;
+ section = NULL;
}
- else
- type = mst_text;
- section = NULL;
- addr = pc;
}
+ else
+ addr = BMSYMBOL_VALUE_ADDRESS (bound_msym);
if (overlay_debugging)
addr = symbol_overlayed_address (addr, section);
- write_exp_elt_opcode (ps, OP_LONG);
- /* Let's make the type big enough to hold a 64-bit address. */
- write_exp_elt_type (ps, objfile_type (objfile)->builtin_core_addr);
- write_exp_elt_longcst (ps, (LONGEST) addr);
- write_exp_elt_opcode (ps, OP_LONG);
-
- if (section && section->the_bfd_section->flags & SEC_THREAD_LOCAL)
+ if (is_tls)
{
- write_exp_elt_opcode (ps, UNOP_MEMVAL_TLS);
- write_exp_elt_objfile (ps, objfile);
- write_exp_elt_type (ps, objfile_type (objfile)->nodebug_tls_symbol);
- write_exp_elt_opcode (ps, UNOP_MEMVAL_TLS);
- return;
+ /* Skip translation if caller does not need the address. */
+ if (address_p != NULL)
+ *address_p = target_translate_tls_address (objfile, addr);
+ return objfile_type (objfile)->nodebug_tls_symbol;
}
- write_exp_elt_opcode (ps, UNOP_MEMVAL);
+ if (address_p != NULL)
+ *address_p = addr;
+
switch (type)
{
case mst_text:
case mst_file_text:
case mst_solib_trampoline:
- write_exp_elt_type (ps, objfile_type (objfile)->nodebug_text_symbol);
- break;
+ return objfile_type (objfile)->nodebug_text_symbol;
case mst_text_gnu_ifunc:
- write_exp_elt_type (ps, objfile_type (objfile)
- ->nodebug_text_gnu_ifunc_symbol);
- break;
+ return objfile_type (objfile)->nodebug_text_gnu_ifunc_symbol;
case mst_data:
case mst_file_data:
case mst_bss:
case mst_file_bss:
- write_exp_elt_type (ps, objfile_type (objfile)->nodebug_data_symbol);
- break;
+ return objfile_type (objfile)->nodebug_data_symbol;
case mst_slot_got_plt:
- write_exp_elt_type (ps, objfile_type (objfile)->nodebug_got_plt_symbol);
- break;
+ return objfile_type (objfile)->nodebug_got_plt_symbol;
default:
- write_exp_elt_type (ps, objfile_type (objfile)->nodebug_unknown_symbol);
- break;
+ return objfile_type (objfile)->nodebug_unknown_symbol;
}
- write_exp_elt_opcode (ps, UNOP_MEMVAL);
}
-/* Mark the current index as the starting location of a structure
- expression. This is used when completing on field names. */
+/* See parser-defs.h. */
void
-mark_struct_expression (struct parser_state *ps)
+parser_state::mark_struct_expression (expr::structop_base_operation *op)
{
gdb_assert (parse_completion
- && expout_tag_completion_type == TYPE_CODE_UNDEF);
- expout_last_struct = ps->expout_ptr;
+ && (m_completion_state.expout_tag_completion_type
+ == TYPE_CODE_UNDEF));
+ m_completion_state.expout_last_op = op;
}
/* Indicate that the current parser invocation is completing a tag.
start of the tag name. */
void
-mark_completion_tag (enum type_code tag, const char *ptr, int length)
+parser_state::mark_completion_tag (enum type_code tag, const char *ptr,
+ int length)
{
gdb_assert (parse_completion
- && expout_tag_completion_type == TYPE_CODE_UNDEF
- && expout_completion_name == NULL
- && expout_last_struct == -1);
+ && (m_completion_state.expout_tag_completion_type
+ == TYPE_CODE_UNDEF)
+ && m_completion_state.expout_completion_name == NULL
+ && m_completion_state.expout_last_op == nullptr);
gdb_assert (tag == TYPE_CODE_UNION
|| tag == TYPE_CODE_STRUCT
|| tag == TYPE_CODE_ENUM);
- expout_tag_completion_type = tag;
- expout_completion_name = (char *) xmalloc (length + 1);
- memcpy (expout_completion_name, ptr, length);
- expout_completion_name[length] = '\0';
+ m_completion_state.expout_tag_completion_type = tag;
+ 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;
struct internalvar *isym = NULL;
+ std::string copy;
/* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
and $$digits (equivalent to $<-digits> if you could type that). */
/* Handle tokens that refer to machine registers:
$ followed by a register name. */
- i = user_reg_map_name_to_regnum (parse_gdbarch (ps),
+ i = user_reg_map_name_to_regnum (gdbarch (),
str.ptr + 1, str.length - 1);
if (i >= 0)
goto handle_register;
/* Any names starting with $ are probably debugger internal variables. */
- isym = lookup_only_internalvar (copy_name (str) + 1);
+ copy = copy_name (str);
+ isym = lookup_only_internalvar (copy.c_str () + 1);
if (isym)
{
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
- write_exp_elt_intern (ps, isym);
- write_exp_elt_opcode (ps, OP_INTERNALVAR);
+ push_new<expr::internalvar_operation> (isym);
return;
}
- /* On some systems, such as HP-UX and hppa-linux, certain system routines
+ /* On some systems, such as HP-UX and hppa-linux, certain system routines
have names beginning with $ or $$. Check for those, first. */
- sym = lookup_symbol (copy_name (str), (struct block *) NULL,
- VAR_DOMAIN, NULL);
+ 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_name (str));
+ 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_name (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);
+ push_new<expr::register_operation> (copy_name (str));
+ block_tracker->update (expression_context_block,
+ INNERMOST_BLOCK_FOR_REGISTERS);
return;
}
+\f
const char *
find_template_name_end (const char *p)
so they can share the storage that lexptr is parsing.
When it is necessary to pass a name to a function that expects
a null-terminated string, the substring is copied out
- into a separate block of storage.
-
- N.B. A single buffer is reused on each call. */
+ into a separate block of storage. */
-char *
+std::string
copy_name (struct stoken token)
{
- /* A temporary buffer for identifiers, so we can null-terminate them.
- We allocate this with xrealloc. parse_exp_1 used to allocate with
- alloca, using the size of the whole expression as a conservative
- estimate of the space needed. However, macro expansion can
- introduce names longer than the original expression; there's no
- practical way to know beforehand how large that might be. */
- static char *namecopy;
- static size_t namecopy_size;
-
- /* Make sure there's enough space for the token. */
- if (namecopy_size < token.length + 1)
- {
- namecopy_size = token.length + 1;
- namecopy = (char *) xrealloc (namecopy, token.length + 1);
- }
-
- memcpy (namecopy, token.ptr, token.length);
- namecopy[token.length] = 0;
-
- return namecopy;
+ return std::string (token.ptr, token.length);
}
\f
-/* See comments on parser-defs.h. */
-
-int
-prefixify_expression (struct expression *expr)
-{
- int len = sizeof (struct expression) + EXP_ELEM_TO_BYTES (expr->nelts);
- struct expression *temp;
- int inpos = expr->nelts, outpos = 0;
-
- temp = (struct expression *) alloca (len);
-
- /* Copy the original expression into temp. */
- memcpy (temp, expr, len);
-
- return prefixify_subexp (temp, expr, inpos, outpos);
-}
-
-/* Return the number of exp_elements in the postfix subexpression
- of EXPR whose operator is at index ENDPOS - 1 in EXPR. */
-
-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->la_exp_desc->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 f90_range_type range_type;
- 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_DOUBLE:
- case OP_DECFLOAT:
- case OP_VAR_VALUE:
- oplen = 4;
- 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:
- case OP_F77_UNDETERMINED_ARGLIST:
- oplen = 3;
- args = 1 + longest_to_int (expr->elts[endpos - 2].longconst);
- break;
-
- case TYPE_INSTANCE:
- oplen = 4 + 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_MEMVAL_TLS:
- oplen = 4;
- 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_F90_RANGE:
- oplen = 3;
- range_type = (enum f90_range_type)
- longest_to_int (expr->elts[endpos - 2].longconst);
-
- switch (range_type)
- {
- case LOW_BOUND_DEFAULT:
- case HIGH_BOUND_DEFAULT:
- args = 1;
- break;
- case BOTH_BOUND_DEFAULT:
- args = 0;
- break;
- case NONE_BOUND_DEFAULT:
- args = 2;
- break;
- }
-
- 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 EXPOUT_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 EXPOUT_LAST_STRUCT. */
-
-static int
-prefixify_subexp (struct expression *inexpr,
- struct expression *outexpr, int inend, int outbeg)
-{
- 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 (expout_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);
- 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;
If COMMA is nonzero, stop if a comma is reached. */
-struct expression *
+expression_up
parse_exp_1 (const char **stringptr, CORE_ADDR pc, const struct block *block,
- int comma)
+ int comma, innermost_block_tracker *tracker)
{
- return parse_exp_in_context (stringptr, pc, block, comma, 0, NULL);
+ return parse_exp_in_context (stringptr, pc, block, comma, false,
+ tracker, nullptr);
}
-static struct expression *
+/* As for parse_exp_1, except that if VOID_CONTEXT_P, then
+ 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, int void_context_p, int *out_subexp)
+ int comma, bool void_context_p,
+ innermost_block_tracker *tracker,
+ expr_completion_state *cstate)
{
- return parse_exp_in_context_1 (stringptr, pc, block, comma,
- void_context_p, out_subexp);
-}
-
-/* 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. */
-
-static struct expression *
-parse_exp_in_context_1 (const char **stringptr, CORE_ADDR pc,
- const struct block *block,
- int comma, int void_context_p, int *out_subexp)
-{
- struct cleanup *old_chain, *inner_chain;
const struct language_defn *lang = NULL;
- struct parser_state ps;
- int subexp;
-
- lexptr = *stringptr;
- prev_lexptr = NULL;
- paren_depth = 0;
- type_stack.depth = 0;
- expout_last_struct = -1;
- expout_tag_completion_type = TYPE_CODE_UNDEF;
- xfree (expout_completion_name);
- expout_completion_name = NULL;
-
- comma_terminates = comma;
-
- if (lexptr == 0 || *lexptr == 0)
+ if (*stringptr == 0 || **stringptr == 0)
error_no_arg (_("expression to compute"));
- old_chain = make_cleanup (free_funcalls, 0 /*ignore*/);
- funcall_chain = 0;
+ const struct block *expression_context_block = block;
+ CORE_ADDR expression_context_pc = 0;
- expression_context_block = block;
+ innermost_block_tracker local_tracker;
+ if (tracker == nullptr)
+ tracker = &local_tracker;
/* If no context specified, try using the current frame, if any. */
if (!expression_context_block)
expression_context_block = get_selected_block (&expression_context_pc);
else if (pc == 0)
- expression_context_pc = BLOCK_START (expression_context_block);
+ expression_context_pc = BLOCK_ENTRY_PC (expression_context_block);
else
expression_context_pc = pc;
= BLOCKVECTOR_BLOCK (SYMTAB_BLOCKVECTOR (cursal.symtab),
STATIC_BLOCK);
if (expression_context_block)
- expression_context_pc = BLOCK_START (expression_context_block);
+ expression_context_pc = BLOCK_ENTRY_PC (expression_context_block);
}
if (language_mode == language_mode_auto && block != NULL)
{
/* Find the language associated to the given context block.
- Default to the current language if it can not be determined.
-
- Note that using the language corresponding to the current frame
- can sometimes give unexpected results. For instance, this
- routine is often called several times during the inferior
- startup phase to re-parse breakpoint expressions after
- a new shared library has been loaded. The language associated
- to the current frame at this moment is not relevant for
- the breakpoint. Using it would therefore be silly, so it seems
- better to rely on the current language rather than relying on
- the current frame language to parse the expression. That's why
- we do the following language detection only if the context block
- has been specifically provided. */
+ Default to the current language if it can not be determined.
+
+ Note that using the language corresponding to the current frame
+ can sometimes give unexpected results. For instance, this
+ routine is often called several times during the inferior
+ startup phase to re-parse breakpoint expressions after
+ a new shared library has been loaded. The language associated
+ to the current frame at this moment is not relevant for
+ the breakpoint. Using it would therefore be silly, so it seems
+ better to rely on the current language rather than relying on
+ the current frame language to parse the expression. That's why
+ we do the following language detection only if the context block
+ has been specifically provided. */
struct symbol *func = block_linkage_function (block);
if (func != NULL)
- lang = language_def (SYMBOL_LANGUAGE (func));
+ lang = language_def (func->language ());
if (lang == NULL || lang->la_language == language_unknown)
- lang = current_language;
+ lang = current_language;
}
else
lang = current_language;
and others called from *.y) ensure CURRENT_LANGUAGE gets restored
to the value matching SELECTED_FRAME as set by get_current_arch. */
- initialize_expout (&ps, 10, lang, get_current_arch ());
- inner_chain = make_cleanup_restore_current_language ();
+ parser_state ps (lang, get_current_arch (), expression_context_block,
+ expression_context_pc, comma, *stringptr,
+ cstate != nullptr, tracker, void_context_p);
+
+ scoped_restore_current_language lang_saver;
set_language (lang->la_language);
- TRY
+ try
{
- if (lang->la_parser (&ps))
- lang->la_error (NULL);
+ lang->parser (&ps);
}
- CATCH (except, RETURN_MASK_ALL)
+ catch (const gdb_exception &except)
{
- if (! parse_completion)
- {
- xfree (ps.expout);
- throw_exception (except);
- }
+ /* 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->op == nullptr)
+ throw;
}
- END_CATCH
-
- reallocate_expout (&ps);
-
- /* Convert expression from postfix form as generated by yacc
- parser, to a prefix form. */
-
- if (expressiondebug)
- dump_raw_expression (ps.expout, gdb_stdlog,
- "before conversion to prefix form");
-
- subexp = prefixify_expression (ps.expout);
- if (out_subexp)
- *out_subexp = subexp;
- lang->la_post_parser (&ps.expout, void_context_p);
+ expression_up result = ps.release ();
+ result->op->set_outermost ();
if (expressiondebug)
- dump_prefix_expression (ps.expout, gdb_stdlog);
+ dump_prefix_expression (result.get (), gdb_stdlog);
- do_cleanups (inner_chain);
- discard_cleanups (old_chain);
-
- *stringptr = lexptr;
- return ps.expout;
+ if (cstate != nullptr)
+ *cstate = std::move (ps.m_completion_state);
+ *stringptr = ps.lexptr;
+ return result;
}
-/* Parse STRING as an expression, and complain if this fails
- to use up all of the contents of STRING. */
+/* Parse STRING as an expression, and complain if this fails to use up
+ all of the contents of STRING. TRACKER, if non-null, will be
+ updated by the parser. VOID_CONTEXT_P should be true to indicate
+ that the expression may be expected to return a value with void
+ type. Parsers are free to ignore this, or to use it to help with
+ overload resolution decisions. */
-struct expression *
-parse_expression (const char *string)
+expression_up
+parse_expression (const char *string, innermost_block_tracker *tracker,
+ bool void_context_p)
{
- struct expression *exp;
-
- exp = parse_exp_1 (&string, 0, 0, 0);
+ expression_up exp = parse_exp_in_context (&string, 0, nullptr, 0,
+ void_context_p,
+ tracker, nullptr);
if (*string)
error (_("Junk after end of expression."));
return exp;
/* Same as parse_expression, but using the given language (LANG)
to parse the expression. */
-struct expression *
+expression_up
parse_expression_with_language (const char *string, enum language lang)
{
- struct cleanup *old_chain = NULL;
- struct expression *expr;
-
+ gdb::optional<scoped_restore_current_language> lang_saver;
if (current_language->la_language != lang)
{
- old_chain = make_cleanup_restore_current_language ();
+ lang_saver.emplace ();
set_language (lang);
}
- expr = parse_expression (string);
-
- if (old_chain != NULL)
- do_cleanups (old_chain);
- return expr;
+ return parse_expression (string);
}
/* Parse STRING as an expression. If parsing ends in the middle of a
reference; furthermore, if the parsing ends in the field name,
return the field name in *NAME. If the parsing ends in the middle
of a field reference, but the reference is somehow invalid, throw
- an exception. In all other cases, return NULL. Returned non-NULL
- *NAME must be freed by the caller. */
+ an exception. In all other cases, return NULL. */
struct type *
-parse_expression_for_completion (const char *string, char **name,
+parse_expression_for_completion (const char *string,
+ gdb::unique_xmalloc_ptr<char> *name,
enum type_code *code)
{
- struct expression *exp = NULL;
- struct value *val;
- int subexp;
+ expression_up exp;
+ expr_completion_state cstate;
- TRY
+ try
{
- parse_completion = 1;
- exp = parse_exp_in_context (&string, 0, 0, 0, 0, &subexp);
+ exp = parse_exp_in_context (&string, 0, 0, 0, false, nullptr, &cstate);
}
- CATCH (except, RETURN_MASK_ERROR)
+ catch (const gdb_exception_error &except)
{
/* Nothing, EXP remains NULL. */
}
- END_CATCH
- parse_completion = 0;
if (exp == NULL)
return NULL;
- if (expout_tag_completion_type != TYPE_CODE_UNDEF)
- {
- *code = expout_tag_completion_type;
- *name = expout_completion_name;
- expout_completion_name = NULL;
- return NULL;
- }
-
- if (expout_last_struct == -1)
+ if (cstate.expout_tag_completion_type != TYPE_CODE_UNDEF)
{
- xfree (exp);
+ *code = cstate.expout_tag_completion_type;
+ *name = std::move (cstate.expout_completion_name);
return NULL;
}
- *name = extract_field_op (exp, &subexp);
- if (!*name)
- {
- xfree (exp);
- return NULL;
- }
-
- /* This might throw an exception. If so, we want to let it
- propagate. */
- val = evaluate_subexpression_type (exp, subexp);
- /* (*NAME) is a part of the EXP memory block freed below. */
- *name = xstrdup (*name);
- xfree (exp);
-
- return value_type (val);
-}
-
-/* A post-parser that does nothing. */
+ if (cstate.expout_last_op == nullptr)
+ return nullptr;
-void
-null_post_parser (struct expression **exp, int void_context_p)
-{
+ 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.
- Return 0 (false) if invalid, 1 (true) if valid.
- The successfully parsed number is stored in D.
- *SUFFIX points to the suffix of the number in P.
+ Return false if invalid, true if valid.
+ The successfully parsed number is stored in DATA in
+ target format for floating-point type TYPE.
NOTE: This accepts the floating point syntax that sscanf accepts. */
-int
-parse_float (const char *p, int len, DOUBLEST *d, const char **suffix)
-{
- char *copy;
- int n, num;
-
- copy = (char *) xmalloc (len + 1);
- memcpy (copy, p, len);
- copy[len] = 0;
-
- num = sscanf (copy, "%" DOUBLEST_SCAN_FORMAT "%n", d, &n);
- xfree (copy);
-
- /* The sscanf man page suggests not making any assumptions on the effect
- of %n on the result, so we don't.
- That is why we simply test num == 0. */
- if (num == 0)
- return 0;
-
- *suffix = p + n;
- return 1;
-}
-
-/* Parse floating point value P of length LEN, using the C syntax for floats.
- Return 0 (false) if invalid, 1 (true) if valid.
- The successfully parsed number is stored in *D.
- Its type is taken from builtin_type (gdbarch) and is stored in *T. */
-
-int
-parse_c_float (struct gdbarch *gdbarch, const char *p, int len,
- DOUBLEST *d, struct type **t)
-{
- const char *suffix;
- int suffix_len;
- const struct builtin_type *builtin_types = builtin_type (gdbarch);
-
- if (! parse_float (p, len, d, &suffix))
- return 0;
-
- suffix_len = p + len - suffix;
-
- if (suffix_len == 0)
- *t = builtin_types->builtin_double;
- else if (suffix_len == 1)
- {
- /* Handle suffixes: 'f' for float, 'l' for long double. */
- if (tolower (*suffix) == 'f')
- *t = builtin_types->builtin_float;
- else if (tolower (*suffix) == 'l')
- *t = builtin_types->builtin_long_double;
- else
- return 0;
- }
- else
- return 0;
-
- return 1;
-}
-\f
-/* Stuff for maintaining a stack of types. Currently just used by C, but
- probably useful for any language which declares its types "backwards". */
-
-/* Ensure that there are HOWMUCH open slots on the type stack STACK. */
-
-static void
-type_stack_reserve (struct type_stack *stack, int howmuch)
-{
- if (stack->depth + howmuch >= stack->size)
- {
- stack->size *= 2;
- if (stack->size < howmuch)
- stack->size = howmuch;
- stack->elements = XRESIZEVEC (union type_stack_elt, stack->elements,
- stack->size);
- }
-}
-
-/* Ensure that there is a single open slot in the global type stack. */
-
-static void
-check_type_stack_depth (void)
-{
- type_stack_reserve (&type_stack, 1);
-}
-
-/* A helper function for insert_type and insert_type_address_space.
- This does work of expanding the type stack and inserting the new
- element, ELEMENT, into the stack at location SLOT. */
-
-static void
-insert_into_type_stack (int slot, union type_stack_elt element)
-{
- check_type_stack_depth ();
-
- if (slot < type_stack.depth)
- memmove (&type_stack.elements[slot + 1], &type_stack.elements[slot],
- (type_stack.depth - slot) * sizeof (union type_stack_elt));
- type_stack.elements[slot] = element;
- ++type_stack.depth;
-}
-
-/* Insert a new type, TP, at the bottom of the type stack. If TP is
- tp_pointer or tp_reference, it is inserted at the bottom. If TP is
- a qualifier, it is inserted at slot 1 (just above a previous
- tp_pointer) if there is anything on the stack, or simply pushed if
- the stack is empty. Other values for TP are invalid. */
-
-void
-insert_type (enum type_pieces tp)
-{
- union type_stack_elt element;
- int slot;
-
- gdb_assert (tp == tp_pointer || tp == tp_reference
- || tp == tp_const || tp == tp_volatile);
-
- /* If there is anything on the stack (we know it will be a
- tp_pointer), insert the qualifier above it. Otherwise, simply
- push this on the top of the stack. */
- if (type_stack.depth && (tp == tp_const || tp == tp_volatile))
- slot = 1;
- else
- slot = 0;
-
- element.piece = tp;
- insert_into_type_stack (slot, element);
-}
-
-void
-push_type (enum type_pieces tp)
-{
- check_type_stack_depth ();
- type_stack.elements[type_stack.depth++].piece = tp;
-}
-
-void
-push_type_int (int n)
-{
- check_type_stack_depth ();
- type_stack.elements[type_stack.depth++].int_val = n;
-}
-
-/* Insert a tp_space_identifier and the corresponding address space
- value into the stack. STRING is the name of an address space, as
- recognized by address_space_name_to_int. If the stack is empty,
- the new elements are simply pushed. If the stack is not empty,
- this function assumes that the first item on the stack is a
- tp_pointer, and the new values are inserted above the first
- item. */
-
-void
-insert_type_address_space (struct parser_state *pstate, char *string)
-{
- union type_stack_elt element;
- int slot;
-
- /* If there is anything on the stack (we know it will be a
- tp_pointer), insert the address space qualifier above it.
- Otherwise, simply push this on the top of the stack. */
- if (type_stack.depth)
- slot = 1;
- else
- slot = 0;
-
- element.piece = tp_space_identifier;
- insert_into_type_stack (slot, element);
- element.int_val = address_space_name_to_int (parse_gdbarch (pstate),
- string);
- insert_into_type_stack (slot, element);
-}
-
-enum type_pieces
-pop_type (void)
-{
- if (type_stack.depth)
- return type_stack.elements[--type_stack.depth].piece;
- return tp_end;
-}
-
-int
-pop_type_int (void)
-{
- if (type_stack.depth)
- return type_stack.elements[--type_stack.depth].int_val;
- /* "Can't happen". */
- return 0;
-}
-
-/* Pop a type list element from the global type stack. */
-
-static VEC (type_ptr) *
-pop_typelist (void)
-{
- gdb_assert (type_stack.depth);
- return type_stack.elements[--type_stack.depth].typelist_val;
-}
-
-/* Pop a type_stack element from the global type stack. */
-
-static struct type_stack *
-pop_type_stack (void)
-{
- gdb_assert (type_stack.depth);
- return type_stack.elements[--type_stack.depth].stack_val;
-}
-
-/* Append the elements of the type stack FROM to the type stack TO.
- Always returns TO. */
-
-struct type_stack *
-append_type_stack (struct type_stack *to, struct type_stack *from)
-{
- type_stack_reserve (to, from->depth);
-
- memcpy (&to->elements[to->depth], &from->elements[0],
- from->depth * sizeof (union type_stack_elt));
- to->depth += from->depth;
-
- return to;
-}
-
-/* Push the type stack STACK as an element on the global type stack. */
-
-void
-push_type_stack (struct type_stack *stack)
-{
- check_type_stack_depth ();
- type_stack.elements[type_stack.depth++].stack_val = stack;
- push_type (tp_type_stack);
-}
-
-/* Copy the global type stack into a newly allocated type stack and
- return it. The global stack is cleared. The returned type stack
- must be freed with type_stack_cleanup. */
-
-struct type_stack *
-get_type_stack (void)
-{
- struct type_stack *result = XNEW (struct type_stack);
-
- *result = type_stack;
- type_stack.depth = 0;
- type_stack.size = 0;
- type_stack.elements = NULL;
-
- return result;
-}
-
-/* A cleanup function that destroys a single type stack. */
-
-void
-type_stack_cleanup (void *arg)
-{
- struct type_stack *stack = (struct type_stack *) arg;
-
- xfree (stack->elements);
- xfree (stack);
-}
-
-/* Push a function type with arguments onto the global type stack.
- LIST holds the argument types. If the final item in LIST is NULL,
- then the function will be varargs. */
-
-void
-push_typelist (VEC (type_ptr) *list)
-{
- check_type_stack_depth ();
- type_stack.elements[type_stack.depth++].typelist_val = list;
- push_type (tp_function_with_arguments);
-}
-
-/* Pop the type stack and return the type which corresponds to FOLLOW_TYPE
- as modified by all the stuff on the stack. */
-struct type *
-follow_types (struct type *follow_type)
+bool
+parse_float (const char *p, int len,
+ const struct type *type, gdb_byte *data)
{
- int done = 0;
- int make_const = 0;
- int make_volatile = 0;
- int make_addr_space = 0;
- int array_size;
-
- while (!done)
- switch (pop_type ())
- {
- case tp_end:
- done = 1;
- if (make_const)
- follow_type = make_cv_type (make_const,
- TYPE_VOLATILE (follow_type),
- follow_type, 0);
- if (make_volatile)
- follow_type = make_cv_type (TYPE_CONST (follow_type),
- make_volatile,
- follow_type, 0);
- if (make_addr_space)
- follow_type = make_type_with_address_space (follow_type,
- make_addr_space);
- make_const = make_volatile = 0;
- make_addr_space = 0;
- break;
- case tp_const:
- make_const = 1;
- break;
- case tp_volatile:
- make_volatile = 1;
- break;
- case tp_space_identifier:
- make_addr_space = pop_type_int ();
- break;
- case tp_pointer:
- follow_type = lookup_pointer_type (follow_type);
- if (make_const)
- follow_type = make_cv_type (make_const,
- TYPE_VOLATILE (follow_type),
- follow_type, 0);
- if (make_volatile)
- follow_type = make_cv_type (TYPE_CONST (follow_type),
- make_volatile,
- follow_type, 0);
- if (make_addr_space)
- follow_type = make_type_with_address_space (follow_type,
- make_addr_space);
- make_const = make_volatile = 0;
- make_addr_space = 0;
- break;
- case tp_reference:
- follow_type = lookup_reference_type (follow_type);
- if (make_const)
- follow_type = make_cv_type (make_const,
- TYPE_VOLATILE (follow_type),
- follow_type, 0);
- if (make_volatile)
- follow_type = make_cv_type (TYPE_CONST (follow_type),
- make_volatile,
- follow_type, 0);
- if (make_addr_space)
- follow_type = make_type_with_address_space (follow_type,
- make_addr_space);
- make_const = make_volatile = 0;
- make_addr_space = 0;
- break;
- case tp_array:
- array_size = pop_type_int ();
- /* FIXME-type-allocation: need a way to free this type when we are
- done with it. */
- follow_type =
- lookup_array_range_type (follow_type,
- 0, array_size >= 0 ? array_size - 1 : 0);
- if (array_size < 0)
- TYPE_HIGH_BOUND_KIND (TYPE_INDEX_TYPE (follow_type))
- = PROP_UNDEFINED;
- break;
- case tp_function:
- /* FIXME-type-allocation: need a way to free this type when we are
- done with it. */
- follow_type = lookup_function_type (follow_type);
- break;
-
- case tp_function_with_arguments:
- {
- VEC (type_ptr) *args = pop_typelist ();
-
- follow_type
- = lookup_function_type_with_arguments (follow_type,
- VEC_length (type_ptr, args),
- VEC_address (type_ptr,
- args));
- VEC_free (type_ptr, args);
- }
- break;
-
- case tp_type_stack:
- {
- struct type_stack *stack = pop_type_stack ();
- /* Sort of ugly, but not really much worse than the
- alternatives. */
- struct type_stack save = type_stack;
-
- type_stack = *stack;
- follow_type = follow_types (follow_type);
- gdb_assert (type_stack.depth == 0);
-
- type_stack = save;
- }
- break;
- default:
- gdb_assert_not_reached ("unrecognized tp_ value in follow_types");
- }
- return follow_type;
+ return target_float_from_string (data, type, std::string (p, len));
}
\f
/* This function avoids direct calls to fprintf
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_DECFLOAT:
- case OP_DOUBLE:
- 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 + 1].longconst;
+/* 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. */
- for (arg = 0; arg < nargs; arg++)
- {
- struct type *type = elts[pos + 2 + arg].type;
- struct objfile *objfile = TYPE_OBJFILE (type);
-
- if (objfile && (*objfile_func) (objfile, data))
- return 1;
- }
- }
- break;
-
- case UNOP_MEMVAL_TLS:
- objfile = elts[pos + 1].objfile;
- type = elts[pos + 2].type;
- break;
-
- case OP_VAR_VALUE:
- {
- const struct block *const block = elts[pos + 1].block;
- const struct symbol *const symbol = elts[pos + 2].symbol;
-
- /* Check objfile where the variable itself is placed.
- SYMBOL_OBJ_SECTION (symbol) may be NULL. */
- if ((*objfile_func) (symbol_objfile (symbol), data))
- return 1;
-
- /* Check objfile where is placed the code touching the variable. */
- objfile = lookup_objfile_from_block (block);
-
- type = SYMBOL_TYPE (symbol);
- }
- break;
- }
-
- /* Invoke callbacks for TYPE and OBJFILE if they were set as non-NULL. */
-
- if (type && TYPE_OBJFILE (type)
- && (*objfile_func) (TYPE_OBJFILE (type), 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->la_exp_desc->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);
-}
-
-/* See definition in parser-defs.h. */
-
-void
-increase_expout_size (struct parser_state *ps, size_t lenelt)
-{
- if ((ps->expout_ptr + lenelt) >= ps->expout_size)
- {
- ps->expout_size = max (ps->expout_size * 2,
- ps->expout_ptr + lenelt + 10);
- ps->expout = (struct expression *)
- xrealloc (ps->expout, (sizeof (struct expression)
- + EXP_ELEM_TO_BYTES (ps->expout_size)));
- }
+ return exp->op->uses_objfile (objfile);
}
+void _initialize_parse ();
void
-_initialize_parse (void)
+_initialize_parse ()
{
- type_stack.size = 0;
- type_stack.depth = 0;
- type_stack.elements = NULL;
-
add_setshow_zuinteger_cmd ("expression", class_maintenance,
&expressiondebug,
_("Set expression debugging."),
projects / deliverable / binutils-gdb.git / blobdiff