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Port the GDB-visible symbols to AIX.

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Without them, GDB doesn't work to debug Emacs, since the AIX linker
optimizes away the relevant external symbols.  Use enums instead;
this suffices for the AIX port, which is 32-bit-only anyway.
* lisp.h (ENUMABLE, DEFINE_GDB_SYMBOL_ENUM): New macros.
(ARRAY_MARK_FLAG, PSEUDOVECTOR_FLAG, VALMASK): Use them.
(ARRAY_MARK_FLAG_val, PSEUDOVECTOR_FLAG_val, VALMASK_val):
New macros.
This commit is contained in:
Paul Eggert 2014-05-28 22:31:43 -07:00
parent ee6b43dc75
commit 3c975a3307
2 changed files with 38 additions and 4 deletions
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11
src/ChangeLog
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@ -1,3 +1,14 @@
2014-05-29 Paul Eggert <eggert@cs.ucla.edu>
Port the GDB-visible symbols to AIX.
Without them, GDB doesn't work to debug Emacs, since the AIX linker
optimizes away the relevant external symbols. Use enums instead;
this suffices for the AIX port, which is 32-bit-only anyway.
* lisp.h (ENUMABLE, DEFINE_GDB_SYMBOL_ENUM): New macros.
(ARRAY_MARK_FLAG, PSEUDOVECTOR_FLAG, VALMASK): Use them.
(ARRAY_MARK_FLAG_val, PSEUDOVECTOR_FLAG_val, VALMASK_val):
New macros.
2014-05-26 Paul Eggert <eggert@cs.ucla.edu>
Include sources used to create macuvs.h.

31
src/lisp.h
View file

@ -36,14 +36,21 @@ INLINE_HEADER_BEGIN
/* Define a TYPE constant ID as an externally visible name. Use like this:
#define ID_val (some integer preprocessor expression)
#if ENUMABLE (ID_val)
DEFINE_GDB_SYMBOL_ENUM (ID)
#else
DEFINE_GDB_SYMBOL_BEGIN (TYPE, ID)
#define ID something
# define ID ID_val
DEFINE_GDB_SYMBOL_END (ID)
#endif
This hack is for the benefit of compilers that do not make macro
definitions visible to the debugger. It's used for symbols that
.gdbinit needs, symbols whose values may not fit in 'int' (where an
enum would suffice). */
#define ENUMABLE(val) (INT_MIN <= (val) && (val) <= INT_MAX)
#define DEFINE_GDB_SYMBOL_ENUM(id) enum { id = id##_val };
#if defined MAIN_PROGRAM
# define DEFINE_GDB_SYMBOL_BEGIN(type, id) type const id EXTERNALLY_VISIBLE
# define DEFINE_GDB_SYMBOL_END(id) = id;
@ -571,15 +578,25 @@ LISP_MACRO_DEFUN (XIL, Lisp_Object, (EMACS_INT i), (i))
/* In the size word of a vector, this bit means the vector has been marked. */
#define ARRAY_MARK_FLAG_val PTRDIFF_MIN
#if ENUMABLE (ARRAY_MARK_FLAG_val)
DEFINE_GDB_SYMBOL_ENUM (ARRAY_MARK_FLAG)
#else
DEFINE_GDB_SYMBOL_BEGIN (ptrdiff_t, ARRAY_MARK_FLAG)
#define ARRAY_MARK_FLAG PTRDIFF_MIN
# define ARRAY_MARK_FLAG ARRAY_MARK_FLAG_val
DEFINE_GDB_SYMBOL_END (ARRAY_MARK_FLAG)
#endif
/* In the size word of a struct Lisp_Vector, this bit means it's really
some other vector-like object. */
#define PSEUDOVECTOR_FLAG_val (PTRDIFF_MAX - PTRDIFF_MAX / 2)
#if ENUMABLE (PSEUDOVECTOR_FLAG_val)
DEFINE_GDB_SYMBOL_ENUM (PSEUDOVECTOR_FLAG)
#else
DEFINE_GDB_SYMBOL_BEGIN (ptrdiff_t, PSEUDOVECTOR_FLAG)
#define PSEUDOVECTOR_FLAG (PTRDIFF_MAX - PTRDIFF_MAX / 2)
# define PSEUDOVECTOR_FLAG PSEUDOVECTOR_FLAG_val
DEFINE_GDB_SYMBOL_END (PSEUDOVECTOR_FLAG)
#endif
/* In a pseudovector, the size field actually contains a word with one
PSEUDOVECTOR_FLAG bit set, and one of the following values extracted
@ -641,9 +658,15 @@ enum More_Lisp_Bits
XCONS (tem) is the struct Lisp_Cons * pointing to the memory for
that cons. */
/* Mask for the value (as opposed to the type bits) of a Lisp object. */
#define VALMASK_val (USE_LSB_TAG ? - (1 << GCTYPEBITS) : VAL_MAX)
#if ENUMABLE (VALMASK_val)
DEFINE_GDB_SYMBOL_ENUM (VALMASK)
#else
DEFINE_GDB_SYMBOL_BEGIN (EMACS_INT, VALMASK)
#define VALMASK (USE_LSB_TAG ? - (1 << GCTYPEBITS) : VAL_MAX)
# define VALMASK VALMASK_val
DEFINE_GDB_SYMBOL_END (VALMASK)
#endif
/* Largest and smallest representable fixnum values. These are the C
values. They are macros for use in static initializers. */