/* Exception (throw catch) mechanism, for GDB, the GNU debugger.
- Copyright (C) 1986-2017 Free Software Foundation, Inc.
+ Copyright (C) 1986-2019 Free Software Foundation, Inc.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
-#ifndef COMMON_EXCEPTIONS_H
-#define COMMON_EXCEPTIONS_H
+#ifndef COMMON_COMMON_EXCEPTIONS_H
+#define COMMON_COMMON_EXCEPTIONS_H
#include <setjmp.h>
#include <new>
+#include <memory>
+#include <string>
/* Reasons for calling throw_exceptions(). NOTE: all reason values
- must be less than zero. enum value 0 is reserved for internal use
- as the return value from an initial setjmp(). The function
- catch_exceptions() reserves values >= 0 as legal results from its
- wrapped function. */
+ must be different from zero. enum value 0 is reserved for internal
+ use as the return value from an initial setjmp(). */
enum return_reason
{
means the register was not saved in the frame. */
OPTIMIZED_OUT_ERROR,
- /* DW_OP_GNU_entry_value resolving failed. */
+ /* DW_OP_entry_value resolving failed. */
NO_ENTRY_VALUE_ERROR,
/* Target throwing an error has been closed. Current command should be
struct gdb_exception
{
- enum return_reason reason;
- enum errors error;
- const char *message;
-};
+ gdb_exception ()
+ : reason ((enum return_reason) 0),
+ error (GDB_NO_ERROR)
+ {
+ }
+
+ gdb_exception (enum return_reason r, enum errors e)
+ : reason (r),
+ error (e)
+ {
+ }
-/* The different exception mechanisms that TRY/CATCH can map to. */
+ gdb_exception (enum return_reason r, enum errors e,
+ const char *fmt, va_list ap)
+ ATTRIBUTE_PRINTF (4, 0)
+ : reason (r),
+ error (e),
+ message (std::make_shared<std::string> (string_vprintf (fmt, ap)))
+ {
+ }
-/* Make GDB exceptions use setjmp/longjmp behind the scenes. */
-#define GDB_XCPT_SJMP 1
+ /* The move constructor exists so that we can mark it "noexcept",
+ which is a good practice for any sort of exception object. */
+ explicit gdb_exception (gdb_exception &&other) noexcept = default;
-/* Make GDB exceptions use try/catch behind the scenes. */
-#define GDB_XCPT_TRY 2
+ /* The copy constructor exists so that we can mark it "noexcept",
+ which is a good practice for any sort of exception object. */
+ gdb_exception (const gdb_exception &other) noexcept
+ : reason (other.reason),
+ error (other.error),
+ message (other.message)
+ {
+ }
-/* Specify this mode to build with TRY/CATCH mapped directly to raw
- try/catch. GDB won't work correctly, but building that way catches
- code tryin to break/continue out of the try block, along with
- spurious code between the TRY and the CATCH block. */
-#define GDB_XCPT_RAW_TRY 3
+ /* The assignment operator exists so that we can mark it "noexcept",
+ which is a good practice for any sort of exception object. */
+ gdb_exception &operator= (const gdb_exception &other) noexcept
+ {
+ reason = other.reason;
+ error = other.error;
+ message = other.message;
+ return *this;
+ }
-#define GDB_XCPT GDB_XCPT_TRY
+ gdb_exception &operator= (gdb_exception &&other) noexcept = default;
+
+ /* Return the contents of the exception message, as a C string. The
+ string remains owned by the exception object. */
+ const char *what () const noexcept
+ {
+ return message->c_str ();
+ }
+
+ enum return_reason reason;
+ enum errors error;
+ std::shared_ptr<std::string> message;
+};
/* Functions to drive the sjlj-based exceptions state machine. Though
declared here by necessity, these functions should be considered
extern int exceptions_state_mc_action_iter_1 (void);
extern int exceptions_state_mc_catch (struct gdb_exception *, int);
-/* Same, but for the C++ try/catch-based TRY/CATCH mechanism. */
-
-#if GDB_XCPT != GDB_XCPT_SJMP
-extern void *exception_try_scope_entry (void);
-extern void exception_try_scope_exit (void *saved_state);
-extern void exception_rethrow (void);
-#endif
-
/* Macro to wrap up standard try/catch behavior.
The double loop lets us correctly handle code "break"ing out of the
*INDENT-OFF*
- TRY
+ TRY_SJLJ
{
}
- CATCH (e, RETURN_MASK_ERROR)
+ CATCH_SJLJ (e, RETURN_MASK_ERROR)
{
switch (e.reason)
{
case RETURN_ERROR: ...
}
}
- END_CATCH
+ END_CATCH_SJLJ
- Note that the SJLJ version of the macros are actually named
- TRY_SJLJ/CATCH_SJLJ in order to make it possible to call them even
- when TRY/CATCH are mapped to C++ try/catch. The SJLJ variants are
- needed in some cases where gdb exceptions need to cross third-party
- library code compiled without exceptions support (e.g.,
- readline). */
+ The SJLJ variants are needed in some cases where gdb exceptions
+ need to cross third-party library code compiled without exceptions
+ support (e.g., readline). */
#define TRY_SJLJ \
{ \
#define END_CATCH_SJLJ \
}
-#if GDB_XCPT == GDB_XCPT_SJMP
-
-/* If using SJLJ-based exceptions for all exceptions, then provide
- standard aliases. */
-
-#define TRY TRY_SJLJ
-#define CATCH CATCH_SJLJ
-#define END_CATCH END_CATCH_SJLJ
-
-#endif /* GDB_XCPT_SJMP */
-
-#if GDB_XCPT == GDB_XCPT_TRY || GDB_XCPT == GDB_XCPT_RAW_TRY
+/* The exception types client code may catch. They're just shims
+ around gdb_exception that add nothing but type info. Which is used
+ is selected depending on the MASK argument passed to CATCH. */
-/* Prevent error/quit during TRY from calling cleanups established
- prior to here. This pops out the scope in either case of normal
- exit or exception exit. */
-struct exception_try_scope
+struct gdb_exception_error : public gdb_exception
{
- exception_try_scope ()
+ gdb_exception_error (enum errors e, const char *fmt, va_list ap)
+ ATTRIBUTE_PRINTF (3, 0)
+ : gdb_exception (RETURN_ERROR, e, fmt, ap)
{
- saved_state = exception_try_scope_entry ();
}
- ~exception_try_scope ()
- {
- exception_try_scope_exit (saved_state);
- }
-
- void *saved_state;
-};
-#if GDB_XCPT == GDB_XCPT_TRY
-
-/* We still need to wrap TRY/CATCH in C++ so that cleanups and C++
- exceptions can coexist. The TRY blocked is wrapped in a
- do/while(0) so that break/continue within the block works the same
- as in C. */
-#define TRY \
- try \
- { \
- exception_try_scope exception_try_scope_instance; \
- do \
- {
-
-#define CATCH(EXCEPTION, MASK) \
- } while (0); \
- } \
- catch (struct gdb_exception ## _ ## MASK &EXCEPTION)
-
-#define END_CATCH \
- catch (...) \
- { \
- exception_rethrow (); \
+ explicit gdb_exception_error (gdb_exception &&ex) noexcept
+ : gdb_exception (std::move (ex))
+ {
+ gdb_assert (ex.reason == RETURN_ERROR);
}
-
-#else
-
-#define TRY try
-#define CATCH(EXCEPTION, MASK) \
- catch (struct gdb_exception ## _ ## MASK &EXCEPTION)
-#define END_CATCH
-
-#endif
-
-/* The exception types client code may catch. They're just shims
- around gdb_exception that add nothing but type info. Which is used
- is selected depending on the MASK argument passed to CATCH. */
-
-struct gdb_exception_RETURN_MASK_ALL : public gdb_exception
-{
};
-struct gdb_exception_RETURN_MASK_ERROR : public gdb_exception_RETURN_MASK_ALL
+struct gdb_exception_quit : public gdb_exception
{
-};
+ gdb_exception_quit (const char *fmt, va_list ap)
+ ATTRIBUTE_PRINTF (2, 0)
+ : gdb_exception (RETURN_QUIT, GDB_NO_ERROR, fmt, ap)
+ {
+ }
-struct gdb_exception_RETURN_MASK_QUIT : public gdb_exception_RETURN_MASK_ALL
-{
+ explicit gdb_exception_quit (gdb_exception &&ex) noexcept
+ : gdb_exception (std::move (ex))
+ {
+ gdb_assert (ex.reason == RETURN_QUIT);
+ }
};
-#endif /* GDB_XCPT_TRY || GDB_XCPT_RAW_TRY */
-
/* An exception type that inherits from both std::bad_alloc and a gdb
exception. This is necessary because operator new can only throw
std::bad_alloc, and OTOH, we want exceptions thrown due to memory
spread around the codebase. */
struct gdb_quit_bad_alloc
- : public gdb_exception_RETURN_MASK_QUIT,
+ : public gdb_exception_quit,
public std::bad_alloc
{
- explicit gdb_quit_bad_alloc (gdb_exception ex)
- : std::bad_alloc ()
+ explicit gdb_quit_bad_alloc (gdb_exception &&ex) noexcept
+ : gdb_exception_quit (std::move (ex)),
+ std::bad_alloc ()
{
- gdb_exception *self = this;
-
- *self = ex;
}
};
/* Throw an exception (as described by "struct gdb_exception"),
landing in the inner most containing exception handler established
using TRY/CATCH. */
-extern void throw_exception (struct gdb_exception exception)
+extern void throw_exception (gdb_exception &&exception)
ATTRIBUTE_NORETURN;
/* Throw an exception by executing a LONG JUMP to the inner most
containing exception handler established using TRY_SJLJ. Necessary
in some cases where we need to throw GDB exceptions across
third-party library code (e.g., readline). */
-extern void throw_exception_sjlj (struct gdb_exception exception)
+extern void throw_exception_sjlj (const struct gdb_exception &exception)
ATTRIBUTE_NORETURN;
/* Convenience wrappers around throw_exception that throw GDB
extern void throw_quit (const char *fmt, ...)
ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF (1, 2);
-/* A pre-defined non-exception. */
-extern const struct gdb_exception exception_none;
-
-#endif /* COMMON_EXCEPTIONS_H */
+#endif /* COMMON_COMMON_EXCEPTIONS_H */
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