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binutils-gdb/gdb/expprint.c
Pedro Alves 3693fdb3c8 Make "p S::method() const::static_var" work too 
Trying to print a function local static variable of a const-qualified
method still doesn't work after the previous fixes:

  (gdb) p 'S::method() const'::static_var
  $1 = {i1 = 1, i2 = 2, i3 = 3}
  (gdb) p S::method() const::static_var
  No symbol "static_var" in specified context.

The reason is that the expression parser/evaluator loses the "const",
and the above unquoted case is just like trying to print a variable of
the non-const overload, if it exists, even.  As if the above unquoted
case had been written as:

  (gdb) p S::method()::static_var
  No symbol "static_var" in specified context.

We can see the problem without static vars in the picture.  With:

 struct S
 {
    void method ();
    void method () const;
 };

Compare:

  (gdb) print 'S::method(void) const'
  $1 = {void (const S * const)} 0x400606 <S::method() const>
  (gdb) print S::method(void) const
  $2 = {void (S * const)} 0x4005d8 <S::method()>   # wrong method!

That's what we need to fix.  If we fix that, the function local static
case starts working.

The grammar production for function/method types is this one:

  exp:       exp '(' parameter_typelist ')' const_or_volatile

This results in a TYPE_INSTANCE expression evaluator operator.  For
the example above, we get something like this ("set debug expression 1"):

...
            0  TYPE_INSTANCE         1 TypeInstance: Type @0x560fda958be0 (void)
            5    OP_SCOPE              Type @0x560fdaa544d8 (S) Field name: `method'
...

While evaluating TYPE_INSTANCE, we end up in
value_struct_elt_for_reference, trying to find the method named
"method" that has the prototype recorded in TYPE_INSTANCE.  In this
case, TYPE_INSTANCE says that we're looking for a method that has
"(void)" as parameters (that's what "1 TypeInstance: Type
@0x560fda958be0 (void)" above means.  The trouble is that nowhere in
this mechanism do we communicate to value_struct_elt_for_reference
that we're looking for the _const_ overload.
value_struct_elt_for_reference only compared parameters, and the
non-const "method()" overload has matching parameters, so it's
considered the right match...

Conveniently, the "const_or_volatile" production in the grammar
already records "const" and "volatile" info in the type stack.  The
type stack is not used in this code path, but we can borrow the
information.  The patch converts the info in the type stack to an
"instance flags" enum, and adds that as another element in
TYPE_INSTANCE operators.  This type instance flags is then applied to
the temporary type that is passed to value_struct_elt_for_reference
for matching.

The other side of the problem is that methods in the debug info aren't
marked const/volatile, so with that in place, the matching never finds
const/volatile-qualified methods.

The problem is that in the DWARF, there's no indication at all whether
a method is const/volatile qualified...  For example (c++filt applied
to the linkage name for convenience):

   <2><d3>: Abbrev Number: 6 (DW_TAG_subprogram)
      <d4>   DW_AT_external    : 1
      <d4>   DW_AT_name        : (indirect string, offset: 0x3df): method
      <d8>   DW_AT_decl_file   : 1
      <d9>   DW_AT_decl_line   : 58
      <da>   DW_AT_linkage_name: (indirect string, offset: 0x5b2): S::method() const
      <de>   DW_AT_declaration : 1
      <de>   DW_AT_object_pointer: <0xe6>
      <e2>   DW_AT_sibling     : <0xec>

I see the same with both GCC and Clang.  The patch works around this
by extracting the cv qualification from the "const" and "volatile" in
the demangled name.  This will need further tweaking for "&" and
"const &" overloads, but we don't support them in the parser yet,
anyway.

The TYPE_CONST changes were necessary otherwise the comparisons in valops.c:

  if (TYPE_CONST (intype) != TYPE_FN_FIELD_CONST (f, j))
    continue;

would fail, because when both TYPE_CONST() TYPE_FN_FIELD_CONST() were
true, their values were different.

BTW, I'm recording the const/volatile-ness of methods in the
TYPE_FN_FIELD info because #1 - I'm not sure it's kosher to change the
method's type directly (vs having to call make_cv_type to create a new
type), and #2 it's what stabsread.c does:

...
	    case 'A':		/* Normal functions.  */
	      new_sublist->fn_field.is_const = 0;
	      new_sublist->fn_field.is_volatile = 0;
	      (*pp)++;
	      break;
	    case 'B':		/* `const' member functions.  */
	      new_sublist->fn_field.is_const = 1;
	      new_sublist->fn_field.is_volatile = 0;
...

After all this, this finally all works:

  print S::method(void) const
  $1 = {void (const S * const)} 0x400606 <S::method() const>
  (gdb) p S::method() const::static_var
  $2 = {i1 = 1, i2 = 2, i3 = 3}

gdb/ChangeLog:
2017-09-04  Pedro Alves  <palves@redhat.com>

	* c-exp.y (function_method, function_method_void): Add current
	instance flags to TYPE_INSTANCE.
	* dwarf2read.c (check_modifier): New.
	(compute_delayed_physnames): Assert that only C++ adds delayed
	physnames.  Mark fn_fields as const/volatile depending on
	physname.
	* eval.c (make_params): New type_instance_flags parameter.  Use
	it as the new type's instance flags.
	(evaluate_subexp_standard) <TYPE_INSTANCE>: Extract the instance
	flags element and pass it to make_params.
	* expprint.c (print_subexp_standard) <TYPE_INSTANCE>: Handle
	instance flags element.
	(dump_subexp_body_standard) <TYPE_INSTANCE>: Likewise.
	* gdbtypes.h: Include "enum-flags.h".
	(type_instance_flags): New enum-flags type.
	(TYPE_CONST, TYPE_VOLATILE, TYPE_RESTRICT, TYPE_ATOMIC)
	(TYPE_CODE_SPACE, TYPE_DATA_SPACE): Return boolean.
	* parse.c (operator_length_standard) <TYPE_INSTANCE>: Adjust.
	(follow_type_instance_flags): New function.
	(operator_check_standard) <TYPE_INSTANCE>: Adjust.
	* parser-defs.h (follow_type_instance_flags): Declare.
	* valops.c (value_struct_elt_for_reference): const/volatile must
	match too.

gdb/testsuite/ChangeLog:
2017-09-04  Pedro Alves  <palves@redhat.com>

	* gdb.base/func-static.c (S::method const, S::method volatile)
	(S::method volatile const): New methods.
	(c_s, v_s, cv_s): New instances.
	(main): Call method() on them.
	* gdb.base/func-static.exp (syntax_re, cannot_resolve_re): New variables.
	(cannot_resolve): New procedure.
	(cxx_scopes_list): Test cv methods.  Add print-scope-quote and
	print-quote-unquoted columns.
	(do_test): Test printing each scope too.
2017-09-04 20:21:16 +01:00

1155 lines
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/* Print in infix form a struct expression.
Copyright (C) 1986-2017 Free Software Foundation, Inc.
This file is part of GDB.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include "defs.h"
#include "symtab.h"
#include "gdbtypes.h"
#include "expression.h"
#include "value.h"
#include "language.h"
#include "parser-defs.h"
#include "user-regs.h" /* For user_reg_map_regnum_to_name. */
#include "target.h"
#include "block.h"
#include "objfiles.h"
#include "valprint.h"
#include <ctype.h>
void
print_expression (struct expression *exp, struct ui_file *stream)
{
int pc = 0;
print_subexp (exp, &pc, stream, PREC_NULL);
}
/* Print the subexpression of EXP that starts in position POS, on STREAM.
PREC is the precedence of the surrounding operator;
if the precedence of the main operator of this subexpression is less,
parentheses are needed here. */
void
print_subexp (struct expression *exp, int *pos,
struct ui_file *stream, enum precedence prec)
{
exp->language_defn->la_exp_desc->print_subexp (exp, pos, stream, prec);
}
/* Standard implementation of print_subexp for use in language_defn
vectors. */
void
print_subexp_standard (struct expression *exp, int *pos,
struct ui_file *stream, enum precedence prec)
{
unsigned tem;
const struct op_print *op_print_tab;
int pc;
unsigned nargs;
const char *op_str;
int assign_modify = 0;
enum exp_opcode opcode;
enum precedence myprec = PREC_NULL;
/* Set to 1 for a right-associative operator. */
int assoc = 0;
struct value *val;
char *tempstr = NULL;
op_print_tab = exp->language_defn->la_op_print_tab;
pc = (*pos)++;
opcode = exp->elts[pc].opcode;
switch (opcode)
{
/* Common ops */
case OP_TYPE:
(*pos) += 2;
type_print (exp->elts[pc + 1].type, "", stream, 0);
return;
case OP_SCOPE:
myprec = PREC_PREFIX;
assoc = 0;
fputs_filtered (type_name_no_tag (exp->elts[pc + 1].type), stream);
fputs_filtered ("::", stream);
nargs = longest_to_int (exp->elts[pc + 2].longconst);
(*pos) += 4 + BYTES_TO_EXP_ELEM (nargs + 1);
fputs_filtered (&exp->elts[pc + 3].string, stream);
return;
case OP_LONG:
{
struct value_print_options opts;
get_no_prettyformat_print_options (&opts);
(*pos) += 3;
value_print (value_from_longest (exp->elts[pc + 1].type,
exp->elts[pc + 2].longconst),
stream, &opts);
}
return;
case OP_DOUBLE:
{
struct value_print_options opts;
get_no_prettyformat_print_options (&opts);
(*pos) += 3;
value_print (value_from_double (exp->elts[pc + 1].type,
exp->elts[pc + 2].doubleconst),
stream, &opts);
}
return;
case OP_VAR_VALUE:
{
const struct block *b;
(*pos) += 3;
b = exp->elts[pc + 1].block;
if (b != NULL
&& BLOCK_FUNCTION (b) != NULL
&& SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)) != NULL)
{
fputs_filtered (SYMBOL_PRINT_NAME (BLOCK_FUNCTION (b)), stream);
fputs_filtered ("::", stream);
}
fputs_filtered (SYMBOL_PRINT_NAME (exp->elts[pc + 2].symbol), stream);
}
return;
case OP_VAR_MSYM_VALUE:
{
(*pos) += 3;
fputs_filtered (MSYMBOL_PRINT_NAME (exp->elts[pc + 2].msymbol), stream);
}
return;
case OP_FUNC_STATIC_VAR:
{
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
fputs_filtered (&exp->elts[pc + 1].string, stream);
}
return;
case OP_VAR_ENTRY_VALUE:
{
(*pos) += 2;
fprintf_filtered (stream, "%s@entry",
SYMBOL_PRINT_NAME (exp->elts[pc + 1].symbol));
}
return;
case OP_LAST:
(*pos) += 2;
fprintf_filtered (stream, "$%d",
longest_to_int (exp->elts[pc + 1].longconst));
return;
case OP_REGISTER:
{
const char *name = &exp->elts[pc + 2].string;
(*pos) += 3 + BYTES_TO_EXP_ELEM (exp->elts[pc + 1].longconst + 1);
fprintf_filtered (stream, "$%s", name);
return;
}
case OP_BOOL:
(*pos) += 2;
fprintf_filtered (stream, "%s",
longest_to_int (exp->elts[pc + 1].longconst)
? "TRUE" : "FALSE");
return;
case OP_INTERNALVAR:
(*pos) += 2;
fprintf_filtered (stream, "$%s",
internalvar_name (exp->elts[pc + 1].internalvar));
return;
case OP_FUNCALL:
(*pos) += 2;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered (" (", stream);
for (tem = 0; tem < nargs; tem++)
{
if (tem != 0)
fputs_filtered (", ", stream);
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
fputs_filtered (")", stream);
return;
case OP_NAME:
nargs = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
fputs_filtered (&exp->elts[pc + 2].string, stream);
return;
case OP_STRING:
{
struct value_print_options opts;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
/* LA_PRINT_STRING will print using the current repeat count threshold.
If necessary, we can temporarily set it to zero, or pass it as an
additional parameter to LA_PRINT_STRING. -fnf */
get_user_print_options (&opts);
LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
(gdb_byte *) &exp->elts[pc + 2].string, nargs,
NULL, 0, &opts);
}
return;
case OP_OBJC_NSSTRING: /* Objective-C Foundation Class
NSString constant. */
{
struct value_print_options opts;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (nargs + 1);
fputs_filtered ("@\"", stream);
get_user_print_options (&opts);
LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
(gdb_byte *) &exp->elts[pc + 2].string, nargs,
NULL, 0, &opts);
fputs_filtered ("\"", stream);
}
return;
case OP_OBJC_MSGCALL:
{ /* Objective C message (method) call. */
char *selector;
(*pos) += 3;
nargs = longest_to_int (exp->elts[pc + 2].longconst);
fprintf_unfiltered (stream, "[");
print_subexp (exp, pos, stream, PREC_SUFFIX);
if (0 == target_read_string (exp->elts[pc + 1].longconst,
&selector, 1024, NULL))
{
error (_("bad selector"));
return;
}
if (nargs)
{
char *s, *nextS;
s = (char *) alloca (strlen (selector) + 1);
strcpy (s, selector);
for (tem = 0; tem < nargs; tem++)
{
nextS = strchr (s, ':');
gdb_assert (nextS); /* Make sure we found ':'. */
*nextS = '\0';
fprintf_unfiltered (stream, " %s: ", s);
s = nextS + 1;
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
}
else
{
fprintf_unfiltered (stream, " %s", selector);
}
fprintf_unfiltered (stream, "]");
/* "selector" was malloc'd by target_read_string. Free it. */
xfree (selector);
return;
}
case OP_ARRAY:
(*pos) += 3;
nargs = longest_to_int (exp->elts[pc + 2].longconst);
nargs -= longest_to_int (exp->elts[pc + 1].longconst);
nargs++;
tem = 0;
if (exp->elts[pc + 4].opcode == OP_LONG
&& exp->elts[pc + 5].type
== builtin_type (exp->gdbarch)->builtin_char
&& exp->language_defn->la_language == language_c)
{
/* Attempt to print C character arrays using string syntax.
Walk through the args, picking up one character from each
of the OP_LONG expression elements. If any array element
does not match our expection of what we should find for
a simple string, revert back to array printing. Note that
the last expression element is an explicit null terminator
byte, which doesn't get printed. */
tempstr = (char *) alloca (nargs);
pc += 4;
while (tem < nargs)
{
if (exp->elts[pc].opcode != OP_LONG
|| exp->elts[pc + 1].type
!= builtin_type (exp->gdbarch)->builtin_char)
{
/* Not a simple array of char, use regular array
printing. */
tem = 0;
break;
}
else
{
tempstr[tem++] =
longest_to_int (exp->elts[pc + 2].longconst);
pc += 4;
}
}
}
if (tem > 0)
{
struct value_print_options opts;
get_user_print_options (&opts);
LA_PRINT_STRING (stream, builtin_type (exp->gdbarch)->builtin_char,
(gdb_byte *) tempstr, nargs - 1, NULL, 0, &opts);
(*pos) = pc;
}
else
{
fputs_filtered (" {", stream);
for (tem = 0; tem < nargs; tem++)
{
if (tem != 0)
{
fputs_filtered (", ", stream);
}
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
fputs_filtered ("}", stream);
}
return;
case TERNOP_COND:
if ((int) prec > (int) PREC_COMMA)
fputs_filtered ("(", stream);
/* Print the subexpressions, forcing parentheses
around any binary operations within them.
This is more parentheses than are strictly necessary,
but it looks clearer. */
print_subexp (exp, pos, stream, PREC_HYPER);
fputs_filtered (" ? ", stream);
print_subexp (exp, pos, stream, PREC_HYPER);
fputs_filtered (" : ", stream);
print_subexp (exp, pos, stream, PREC_HYPER);
if ((int) prec > (int) PREC_COMMA)
fputs_filtered (")", stream);
return;
case TERNOP_SLICE:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("(", stream);
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
fputs_filtered (opcode == TERNOP_SLICE ? " : " : " UP ", stream);
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
fputs_filtered (")", stream);
return;
case STRUCTOP_STRUCT:
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered (".", stream);
fputs_filtered (&exp->elts[pc + 2].string, stream);
return;
/* Will not occur for Modula-2. */
case STRUCTOP_PTR:
tem = longest_to_int (exp->elts[pc + 1].longconst);
(*pos) += 3 + BYTES_TO_EXP_ELEM (tem + 1);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("->", stream);
fputs_filtered (&exp->elts[pc + 2].string, stream);
return;
case STRUCTOP_MEMBER:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered (".*", stream);
print_subexp (exp, pos, stream, PREC_SUFFIX);
return;
case STRUCTOP_MPTR:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("->*", stream);
print_subexp (exp, pos, stream, PREC_SUFFIX);
return;
case BINOP_SUBSCRIPT:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("[", stream);
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
fputs_filtered ("]", stream);
return;
case UNOP_POSTINCREMENT:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("++", stream);
return;
case UNOP_POSTDECREMENT:
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered ("--", stream);
return;
case UNOP_CAST:
(*pos) += 2;
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered ("(", stream);
fputs_filtered ("(", stream);
type_print (exp->elts[pc + 1].type, "", stream, 0);
fputs_filtered (") ", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered (")", stream);
return;
case UNOP_CAST_TYPE:
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered ("(", stream);
fputs_filtered ("(", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
fputs_filtered (") ", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered (")", stream);
return;
case UNOP_DYNAMIC_CAST:
case UNOP_REINTERPRET_CAST:
fputs_filtered (opcode == UNOP_DYNAMIC_CAST ? "dynamic_cast"
: "reinterpret_cast", stream);
fputs_filtered ("<", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
fputs_filtered ("> (", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
fputs_filtered (")", stream);
return;
case UNOP_MEMVAL:
(*pos) += 2;
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered ("(", stream);
if (TYPE_CODE (exp->elts[pc + 1].type) == TYPE_CODE_FUNC
&& exp->elts[pc + 3].opcode == OP_LONG)
{
struct value_print_options opts;
/* We have a minimal symbol fn, probably. It's encoded
as a UNOP_MEMVAL (function-type) of an OP_LONG (int, address).
Swallow the OP_LONG (including both its opcodes); ignore
its type; print the value in the type of the MEMVAL. */
(*pos) += 4;
val = value_at_lazy (exp->elts[pc + 1].type,
(CORE_ADDR) exp->elts[pc + 5].longconst);
get_no_prettyformat_print_options (&opts);
value_print (val, stream, &opts);
}
else
{
fputs_filtered ("{", stream);
type_print (exp->elts[pc + 1].type, "", stream, 0);
fputs_filtered ("} ", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
}
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered (")", stream);
return;
case UNOP_MEMVAL_TYPE:
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered ("(", stream);
fputs_filtered ("{", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
fputs_filtered ("} ", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
if ((int) prec > (int) PREC_PREFIX)
fputs_filtered (")", stream);
return;
case BINOP_ASSIGN_MODIFY:
opcode = exp->elts[pc + 1].opcode;
(*pos) += 2;
myprec = PREC_ASSIGN;
assoc = 1;
assign_modify = 1;
op_str = "???";
for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
if (op_print_tab[tem].opcode == opcode)
{
op_str = op_print_tab[tem].string;
break;
}
if (op_print_tab[tem].opcode != opcode)
/* Not found; don't try to keep going because we don't know how
to interpret further elements. */
error (_("Invalid expression"));
break;
/* C++ ops */
case OP_THIS:
++(*pos);
if (exp->language_defn->la_name_of_this)
fputs_filtered (exp->language_defn->la_name_of_this, stream);
else
fprintf_filtered (stream, _("<language %s has no 'this'>"),
exp->language_defn->la_name);
return;
/* Modula-2 ops */
case MULTI_SUBSCRIPT:
(*pos) += 2;
nargs = longest_to_int (exp->elts[pc + 1].longconst);
print_subexp (exp, pos, stream, PREC_SUFFIX);
fprintf_unfiltered (stream, " [");
for (tem = 0; tem < nargs; tem++)
{
if (tem != 0)
fprintf_unfiltered (stream, ", ");
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
}
fprintf_unfiltered (stream, "]");
return;
case BINOP_VAL:
(*pos) += 2;
fprintf_unfiltered (stream, "VAL(");
type_print (exp->elts[pc + 1].type, "", stream, 0);
fprintf_unfiltered (stream, ",");
print_subexp (exp, pos, stream, PREC_PREFIX);
fprintf_unfiltered (stream, ")");
return;
case TYPE_INSTANCE:
{
type_instance_flags flags
= (type_instance_flag_value) longest_to_int (exp->elts[pc + 1].longconst);
LONGEST count = exp->elts[pc + 2].longconst;
/* The FLAGS. */
(*pos)++;
/* The COUNT. */
(*pos)++;
fputs_unfiltered ("TypeInstance(", stream);
while (count-- > 0)
{
type_print (exp->elts[(*pos)++].type, "", stream, 0);
if (count > 0)
fputs_unfiltered (",", stream);
}
fputs_unfiltered (",", stream);
/* Ending COUNT and ending TYPE_INSTANCE. */
(*pos) += 2;
print_subexp (exp, pos, stream, PREC_PREFIX);
if (flags & TYPE_INSTANCE_FLAG_CONST)
fputs_unfiltered (",const", stream);
if (flags & TYPE_INSTANCE_FLAG_VOLATILE)
fputs_unfiltered (",volatile", stream);
fputs_unfiltered (")", stream);
return;
}
case OP_RANGE:
{
enum range_type range_type;
range_type = (enum range_type)
longest_to_int (exp->elts[pc + 1].longconst);
*pos += 2;
fputs_filtered ("RANGE(", stream);
if (range_type == HIGH_BOUND_DEFAULT
|| range_type == NONE_BOUND_DEFAULT)
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
fputs_filtered ("..", stream);
if (range_type == LOW_BOUND_DEFAULT
|| range_type == NONE_BOUND_DEFAULT)
print_subexp (exp, pos, stream, PREC_ABOVE_COMMA);
fputs_filtered (")", stream);
return;
}
/* Default ops */
default:
op_str = "???";
for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
if (op_print_tab[tem].opcode == opcode)
{
op_str = op_print_tab[tem].string;
myprec = op_print_tab[tem].precedence;
assoc = op_print_tab[tem].right_assoc;
break;
}
if (op_print_tab[tem].opcode != opcode)
/* Not found; don't try to keep going because we don't know how
to interpret further elements. For example, this happens
if opcode is OP_TYPE. */
error (_("Invalid expression"));
}
/* Note that PREC_BUILTIN will always emit parentheses. */
if ((int) myprec < (int) prec)
fputs_filtered ("(", stream);
if ((int) opcode > (int) BINOP_END)
{
if (assoc)
{
/* Unary postfix operator. */
print_subexp (exp, pos, stream, PREC_SUFFIX);
fputs_filtered (op_str, stream);
}
else
{
/* Unary prefix operator. */
fputs_filtered (op_str, stream);
if (myprec == PREC_BUILTIN_FUNCTION)
fputs_filtered ("(", stream);
print_subexp (exp, pos, stream, PREC_PREFIX);
if (myprec == PREC_BUILTIN_FUNCTION)
fputs_filtered (")", stream);
}
}
else
{
/* Binary operator. */
/* Print left operand.
If operator is right-associative,
increment precedence for this operand. */
print_subexp (exp, pos, stream,
(enum precedence) ((int) myprec + assoc));
/* Print the operator itself. */
if (assign_modify)
fprintf_filtered (stream, " %s= ", op_str);
else if (op_str[0] == ',')
fprintf_filtered (stream, "%s ", op_str);
else
fprintf_filtered (stream, " %s ", op_str);
/* Print right operand.
If operator is left-associative,
increment precedence for this operand. */
print_subexp (exp, pos, stream,
(enum precedence) ((int) myprec + !assoc));
}
if ((int) myprec < (int) prec)
fputs_filtered (")", stream);
}
/* Return the operator corresponding to opcode OP as
a string. NULL indicates that the opcode was not found in the
current language table. */
const char *
op_string (enum exp_opcode op)
{
int tem;
const struct op_print *op_print_tab;
op_print_tab = current_language->la_op_print_tab;
for (tem = 0; op_print_tab[tem].opcode != OP_NULL; tem++)
if (op_print_tab[tem].opcode == op)
return op_print_tab[tem].string;
return NULL;
}
/* Support for dumping the raw data from expressions in a human readable
form. */
static int dump_subexp_body (struct expression *exp, struct ui_file *, int);
/* Name for OPCODE, when it appears in expression EXP. */
const char *
op_name (struct expression *exp, enum exp_opcode opcode)
{
return exp->language_defn->la_exp_desc->op_name (opcode);
}
/* Default name for the standard operator OPCODE (i.e., one defined in
the definition of enum exp_opcode). */
const char *
op_name_standard (enum exp_opcode opcode)
{
switch (opcode)
{
default:
{
static char buf[30];
xsnprintf (buf, sizeof (buf), "<unknown %d>", opcode);
return buf;
}
#define OP(name) \
case name: \
return #name ;
#include "std-operator.def"
#undef OP
}
}
/* Print a raw dump of expression EXP to STREAM.
NOTE, if non-NULL, is printed as extra explanatory text. */
void
dump_raw_expression (struct expression *exp, struct ui_file *stream,
const char *note)
{
int elt;
char *eltscan;
int eltsize;
fprintf_filtered (stream, "Dump of expression @ ");
gdb_print_host_address (exp, stream);
if (note)
fprintf_filtered (stream, ", %s:", note);
fprintf_filtered (stream, "\n\tLanguage %s, %d elements, %ld bytes each.\n",
exp->language_defn->la_name, exp->nelts,
(long) sizeof (union exp_element));
fprintf_filtered (stream, "\t%5s %20s %16s %s\n", "Index", "Opcode",
"Hex Value", "String Value");
for (elt = 0; elt < exp->nelts; elt++)
{
fprintf_filtered (stream, "\t%5d ", elt);
const char *opcode_name = op_name (exp, exp->elts[elt].opcode);
fprintf_filtered (stream, "%20s ", opcode_name);
print_longest (stream, 'd', 0, exp->elts[elt].longconst);
fprintf_filtered (stream, " ");
for (eltscan = (char *) &exp->elts[elt],
eltsize = sizeof (union exp_element);
eltsize-- > 0;
eltscan++)
{
fprintf_filtered (stream, "%c",
isprint (*eltscan) ? (*eltscan & 0xFF) : '.');
}
fprintf_filtered (stream, "\n");
}
}
/* Dump the subexpression of prefix expression EXP whose operator is at
position ELT onto STREAM. Returns the position of the next
subexpression in EXP. */
int
dump_subexp (struct expression *exp, struct ui_file *stream, int elt)
{
static int indent = 0;
int i;
fprintf_filtered (stream, "\n");
fprintf_filtered (stream, "\t%5d ", elt);
for (i = 1; i <= indent; i++)
fprintf_filtered (stream, " ");
indent += 2;
fprintf_filtered (stream, "%-20s ", op_name (exp, exp->elts[elt].opcode));
elt = dump_subexp_body (exp, stream, elt);
indent -= 2;
return elt;
}
/* Dump the operands of prefix expression EXP whose opcode is at
position ELT onto STREAM. Returns the position of the next
subexpression in EXP. */
static int
dump_subexp_body (struct expression *exp, struct ui_file *stream, int elt)
{
return exp->language_defn->la_exp_desc->dump_subexp_body (exp, stream, elt);
}
/* Default value for subexp_body in exp_descriptor vector. */
int
dump_subexp_body_standard (struct expression *exp,
struct ui_file *stream, int elt)
{
int opcode = exp->elts[elt++].opcode;
switch (opcode)
{
case TERNOP_COND:
case TERNOP_SLICE:
elt = dump_subexp (exp, stream, elt);
/* FALL THROUGH */
case BINOP_ADD:
case BINOP_SUB:
case BINOP_MUL:
case BINOP_DIV:
case BINOP_REM:
case BINOP_MOD:
case BINOP_LSH:
case BINOP_RSH:
case BINOP_LOGICAL_AND:
case BINOP_LOGICAL_OR:
case BINOP_BITWISE_AND:
case BINOP_BITWISE_IOR:
case BINOP_BITWISE_XOR:
case BINOP_EQUAL:
case BINOP_NOTEQUAL:
case BINOP_LESS:
case BINOP_GTR:
case BINOP_LEQ:
case BINOP_GEQ:
case BINOP_REPEAT:
case BINOP_ASSIGN:
case BINOP_COMMA:
case BINOP_SUBSCRIPT:
case BINOP_EXP:
case BINOP_MIN:
case BINOP_MAX:
case BINOP_INTDIV:
case BINOP_ASSIGN_MODIFY:
case BINOP_VAL:
case BINOP_CONCAT:
case BINOP_END:
case STRUCTOP_MEMBER:
case STRUCTOP_MPTR:
elt = dump_subexp (exp, stream, elt);
/* FALL THROUGH */
case UNOP_NEG:
case UNOP_LOGICAL_NOT:
case UNOP_COMPLEMENT:
case UNOP_IND:
case UNOP_ADDR:
case UNOP_PREINCREMENT:
case UNOP_POSTINCREMENT:
case UNOP_PREDECREMENT:
case UNOP_POSTDECREMENT:
case UNOP_SIZEOF:
case UNOP_PLUS:
case UNOP_CAP:
case UNOP_CHR:
case UNOP_ORD:
case UNOP_ABS:
case UNOP_FLOAT:
case UNOP_HIGH:
case UNOP_MAX:
case UNOP_MIN:
case UNOP_ODD:
case UNOP_TRUNC:
elt = dump_subexp (exp, stream, elt);
break;
case OP_LONG:
fprintf_filtered (stream, "Type @");
gdb_print_host_address (exp->elts[elt].type, stream);
fprintf_filtered (stream, " (");
type_print (exp->elts[elt].type, NULL, stream, 0);
fprintf_filtered (stream, "), value %ld (0x%lx)",
(long) exp->elts[elt + 1].longconst,
(long) exp->elts[elt + 1].longconst);
elt += 3;
break;
case OP_DOUBLE:
fprintf_filtered (stream, "Type @");
gdb_print_host_address (exp->elts[elt].type, stream);
fprintf_filtered (stream, " (");
type_print (exp->elts[elt].type, NULL, stream, 0);
fprintf_filtered (stream, "), value %g",
(double) exp->elts[elt + 1].doubleconst);
elt += 3;
break;
case OP_VAR_VALUE:
fprintf_filtered (stream, "Block @");
gdb_print_host_address (exp->elts[elt].block, stream);
fprintf_filtered (stream, ", symbol @");
gdb_print_host_address (exp->elts[elt + 1].symbol, stream);
fprintf_filtered (stream, " (%s)",
SYMBOL_PRINT_NAME (exp->elts[elt + 1].symbol));
elt += 3;
break;
case OP_VAR_MSYM_VALUE:
fprintf_filtered (stream, "Objfile @");
gdb_print_host_address (exp->elts[elt].objfile, stream);
fprintf_filtered (stream, ", msymbol @");
gdb_print_host_address (exp->elts[elt + 1].msymbol, stream);
fprintf_filtered (stream, " (%s)",
MSYMBOL_PRINT_NAME (exp->elts[elt + 1].msymbol));
elt += 3;
break;
case OP_VAR_ENTRY_VALUE:
fprintf_filtered (stream, "Entry value of symbol @");
gdb_print_host_address (exp->elts[elt].symbol, stream);
fprintf_filtered (stream, " (%s)",
SYMBOL_PRINT_NAME (exp->elts[elt].symbol));
elt += 2;
break;
case OP_LAST:
fprintf_filtered (stream, "History element %ld",
(long) exp->elts[elt].longconst);
elt += 2;
break;
case OP_REGISTER:
fprintf_filtered (stream, "Register $%s", &exp->elts[elt + 1].string);
elt += 3 + BYTES_TO_EXP_ELEM (exp->elts[elt].longconst + 1);
break;
case OP_INTERNALVAR:
fprintf_filtered (stream, "Internal var @");
gdb_print_host_address (exp->elts[elt].internalvar, stream);
fprintf_filtered (stream, " (%s)",
internalvar_name (exp->elts[elt].internalvar));
elt += 2;
break;
case OP_FUNCALL:
{
int i, nargs;
nargs = longest_to_int (exp->elts[elt].longconst);
fprintf_filtered (stream, "Number of args: %d", nargs);
elt += 2;
for (i = 1; i <= nargs + 1; i++)
elt = dump_subexp (exp, stream, elt);
}
break;
case OP_ARRAY:
{
int lower, upper;
int i;
lower = longest_to_int (exp->elts[elt].longconst);
upper = longest_to_int (exp->elts[elt + 1].longconst);
fprintf_filtered (stream, "Bounds [%d:%d]", lower, upper);
elt += 3;
for (i = 1; i <= upper - lower + 1; i++)
elt = dump_subexp (exp, stream, elt);
}
break;
case UNOP_DYNAMIC_CAST:
case UNOP_REINTERPRET_CAST:
case UNOP_CAST_TYPE:
case UNOP_MEMVAL_TYPE:
fprintf_filtered (stream, " (");
elt = dump_subexp (exp, stream, elt);
fprintf_filtered (stream, ")");
elt = dump_subexp (exp, stream, elt);
break;
case UNOP_MEMVAL:
case UNOP_CAST:
fprintf_filtered (stream, "Type @");
gdb_print_host_address (exp->elts[elt].type, stream);
fprintf_filtered (stream, " (");
type_print (exp->elts[elt].type, NULL, stream, 0);
fprintf_filtered (stream, ")");
elt = dump_subexp (exp, stream, elt + 2);
break;
case OP_TYPE:
fprintf_filtered (stream, "Type @");
gdb_print_host_address (exp->elts[elt].type, stream);
fprintf_filtered (stream, " (");
type_print (exp->elts[elt].type, NULL, stream, 0);
fprintf_filtered (stream, ")");
elt += 2;
break;
case OP_TYPEOF:
case OP_DECLTYPE:
fprintf_filtered (stream, "Typeof (");
elt = dump_subexp (exp, stream, elt);
fprintf_filtered (stream, ")");
break;
case OP_TYPEID:
fprintf_filtered (stream, "typeid (");
elt = dump_subexp (exp, stream, elt);
fprintf_filtered (stream, ")");
break;
case STRUCTOP_STRUCT:
case STRUCTOP_PTR:
{
char *elem_name;
int len;
len = longest_to_int (exp->elts[elt].longconst);
elem_name = &exp->elts[elt + 1].string;
fprintf_filtered (stream, "Element name: `%.*s'", len, elem_name);
elt = dump_subexp (exp, stream, elt + 3 + BYTES_TO_EXP_ELEM (len + 1));
}
break;
case OP_SCOPE:
{
char *elem_name;
int len;
fprintf_filtered (stream, "Type @");
gdb_print_host_address (exp->elts[elt].type, stream);
fprintf_filtered (stream, " (");
type_print (exp->elts[elt].type, NULL, stream, 0);
fprintf_filtered (stream, ") ");
len = longest_to_int (exp->elts[elt + 1].longconst);
elem_name = &exp->elts[elt + 2].string;
fprintf_filtered (stream, "Field name: `%.*s'", len, elem_name);
elt += 4 + BYTES_TO_EXP_ELEM (len + 1);
}
break;
case OP_FUNC_STATIC_VAR:
{
int len = longest_to_int (exp->elts[elt].longconst);
const char *var_name = &exp->elts[elt + 1].string;
fprintf_filtered (stream, "Field name: `%.*s'", len, var_name);
elt += 3 + BYTES_TO_EXP_ELEM (len + 1);
}
break;
case TYPE_INSTANCE:
{
type_instance_flags flags
= (type_instance_flag_value) longest_to_int (exp->elts[elt++].longconst);
LONGEST len = exp->elts[elt++].longconst;
fprintf_filtered (stream, "%s TypeInstance: ", plongest (len));
while (len-- > 0)
{
fprintf_filtered (stream, "Type @");
gdb_print_host_address (exp->elts[elt].type, stream);
fprintf_filtered (stream, " (");
type_print (exp->elts[elt].type, NULL, stream, 0);
fprintf_filtered (stream, ")");
elt++;
if (len > 0)
fputs_filtered (", ", stream);
}
fprintf_filtered (stream, " Flags: %s (", hex_string (flags));
bool space = false;
auto print_one = [&] (const char *mod)
{
if (space)
fputs_filtered (" ", stream);
space = true;
fprintf_filtered (stream, mod);
};
if (flags & TYPE_INSTANCE_FLAG_CONST)
print_one ("const");
if (flags & TYPE_INSTANCE_FLAG_VOLATILE)
print_one ("volatile");
fprintf_filtered (stream, ")");
/* Ending LEN and ending TYPE_INSTANCE. */
elt += 2;
elt = dump_subexp (exp, stream, elt);
}
break;
case OP_STRING:
{
LONGEST len = exp->elts[elt].longconst;
LONGEST type = exp->elts[elt + 1].longconst;
fprintf_filtered (stream, "Language-specific string type: %s",
plongest (type));
/* Skip length. */
elt += 1;
/* Skip string content. */
elt += BYTES_TO_EXP_ELEM (len);
/* Skip length and ending OP_STRING. */
elt += 2;
}
break;
case OP_RANGE:
{
enum range_type range_type;
range_type = (enum range_type)
longest_to_int (exp->elts[elt].longconst);
elt += 2;
switch (range_type)
{
case BOTH_BOUND_DEFAULT:
fputs_filtered ("Range '..'", stream);
break;
case LOW_BOUND_DEFAULT:
fputs_filtered ("Range '..EXP'", stream);
break;
case HIGH_BOUND_DEFAULT:
fputs_filtered ("Range 'EXP..'", stream);
break;
case NONE_BOUND_DEFAULT:
fputs_filtered ("Range 'EXP..EXP'", stream);
break;
default:
fputs_filtered ("Invalid Range!", stream);
break;
}
if (range_type == HIGH_BOUND_DEFAULT
|| range_type == NONE_BOUND_DEFAULT)
elt = dump_subexp (exp, stream, elt);
if (range_type == LOW_BOUND_DEFAULT
|| range_type == NONE_BOUND_DEFAULT)
elt = dump_subexp (exp, stream, elt);
}
break;
default:
case OP_NULL:
case MULTI_SUBSCRIPT:
case OP_F77_UNDETERMINED_ARGLIST:
case OP_COMPLEX:
case OP_BOOL:
case OP_M2_STRING:
case OP_THIS:
case OP_NAME:
fprintf_filtered (stream, "Unknown format");
}
return elt;
}
void
dump_prefix_expression (struct expression *exp, struct ui_file *stream)
{
int elt;
fprintf_filtered (stream, "Dump of expression @ ");
gdb_print_host_address (exp, stream);
fputs_filtered (", after conversion to prefix form:\nExpression: `", stream);
print_expression (exp, stream);
fprintf_filtered (stream, "'\n\tLanguage %s, %d elements, %ld bytes each.\n",
exp->language_defn->la_name, exp->nelts,
(long) sizeof (union exp_element));
fputs_filtered ("\n", stream);
for (elt = 0; elt < exp->nelts;)
elt = dump_subexp (exp, stream, elt);
fputs_filtered ("\n", stream);
}
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