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libctf, include: debuggability improvements

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When --enable-libctf-hash-debugging is on, make ctf_set_errno and
ctf_set_typed_errno into real functions, not inlines, so you can
drop breakpoints on them.  Since we are breaking API, also move
ECTF_NEXT_END to the start of the _CTF_ERRORS array, so you can
check for real (non-ECTF_NEXT_END) errors in breakpooints on those
functions by checking for err > 1000.
This commit is contained in:
Nick Alcock
2025-04-24 14:20:28 +01:00
parent 2ef9554023
commit 7bcd444b9c
3 changed files with 30 additions and 3 deletions
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4
include/ctf-api.h
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@@ -183,7 +183,8 @@ typedef struct ctf_snapshot_id
and _CTF_ITEM to expand as you like, then mention the macro name.
See the enum after this for an example. */
#define _CTF_ERRORS \
_CTF_FIRST (ECTF_FMT, "File is not in CTF or ELF format.") \
_CTF_FIRST (ECTF_NEXT_END, "End of iteration.") \
_CTF_ITEM (ECTF_FMT, "File is not in CTF or ELF format.") \
_CTF_ITEM (ECTF_BFDERR, "BFD error.") \
_CTF_ITEM (ECTF_CTFVERS, "CTF dict version is too new for libctf.") \
_CTF_ITEM (ECTF_BFD_AMBIGUOUS, "Ambiguous BFD target.") \
@@ -233,7 +234,6 @@ typedef struct ctf_snapshot_id
_CTF_ITEM (ECTF_NOTYET, "Feature not yet implemented.") \
_CTF_ITEM (ECTF_INTERNAL, "Internal error: assertion failure.") \
_CTF_ITEM (ECTF_NONREPRESENTABLE, "Type not representable in CTF.") \
_CTF_ITEM (ECTF_NEXT_END, "End of iteration.") \
_CTF_ITEM (ECTF_NEXT_WRONGFUN, "Wrong iteration function called.") \
_CTF_ITEM (ECTF_NEXT_WRONGFP, "Iteration entity changed in mid-iterate.") \
_CTF_ITEM (ECTF_FLAGS, "CTF header contains flags unknown to libctf.") \

20
libctf/ctf-api.c
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@@ -67,6 +67,26 @@ ctf_set_open_errno (int *errp, int error)
return NULL;
}
/* See ctf-inlines.h. */
#ifdef ENABLE_LIBCTF_HASH_DEBUGGING
int
ctf_set_errno (ctf_dict_t *fp, int err)
{
fp->ctf_errno = err;
/* Don't rely on CTF_ERR here as it will not properly sign extend on 64-bit
Windows ABI. */
return -1;
}
ctf_id_t
ctf_set_typed_errno (ctf_dict_t *fp, int err)
{
fp->ctf_errno = err;
return CTF_ERR;
}
#endif
/* Get and set CTF dict-wide flags. We are fairly strict about returning
errors here, to make it easier to determine programmatically which flags are
valid. */

9
libctf/ctf-inlines.h
View File

@@ -90,6 +90,10 @@ ctf_assert_internal (ctf_dict_t *fp, const char *file, size_t line,
return expr;
}
/* Un-inline these functions if debugging, so you can drop breakpoints on the
setting of any error anywhere by the library. */
#ifndef ENABLE_LIBCTF_HASH_DEBUGGING
static inline int
ctf_set_errno (ctf_dict_t *fp, int err)
{
@@ -105,7 +109,10 @@ ctf_set_typed_errno (ctf_dict_t *fp, int err)
fp->ctf_errno = err;
return CTF_ERR;
}
#else
extern int ctf_set_errno (ctf_dict_t *fp, int err);
extern ctf_id_t ctf_set_typed_errno (ctf_dict_t *fp, int err);
#endif
#ifdef __cplusplus
}