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linker: Make the errors reported by dlopen/dlsym be more useful.

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Changed it so that when the linker generates error messages, they are
scribbled away into a buffer that dlfcn and friends can read from.

Since the error messages are generetad with snprintf, and snprintf
MAY call malloc during some code paths, we now link against a version
of libc that does not contain malloc/free/realloc/calloc. We then define
malloc and friends in the dynamic loader, and make them abort() if they
are ever called.

Signed-off-by: Dima Zavin <dima@android.com>
This commit is contained in:
Dima Zavin
2009-05-20 18:28:09 -07:00
parent 49e5533278
commit 2e85579c34
5 changed files with 106 additions and 67 deletions
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14
linker/linker_debug.h
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@@ -55,17 +55,16 @@
#define TRUE 1
#define FALSE 0
#define __PRINTVF(v,f,x...) do { \
(debug_verbosity > (v)) && (printf(x), ((f) && fflush(stdout))); \
} while (0)
/* Only use printf() during debugging. We have seen occasional memory
* corruption when the linker uses printf().
*/
#if LINKER_DEBUG
extern int debug_verbosity;
#warning "*** LINKER IS USING printf(); DO NOT CHECK THIS IN ***"
#define _PRINTVF(v,f,x...) __PRINTVF(v,f,x)
#define _PRINTVF(v,f,x...) \
do { \
(debug_verbosity > (v)) && (printf(x), ((f) && fflush(stdout))); \
} while (0)
#else /* !LINKER_DEBUG */
#define _PRINTVF(v,f,x...) do {} while(0)
#endif /* LINKER_DEBUG */
@@ -75,8 +74,9 @@ extern int debug_verbosity;
#define TRACE(x...) _PRINTVF(1, TRUE, x)
#define WARN(fmt,args...) \
_PRINTVF(-1, TRUE, "%s:%d| WARNING: " fmt, __FILE__, __LINE__, ## args)
#define ERROR(fmt,args...) \
__PRINTVF(-1, TRUE, "%s:%d| ERROR: " fmt, __FILE__, __LINE__, ## args)
#define ERROR(fmt,args...) \
_PRINTVF(-1, TRUE, "%s:%d| ERROR: " fmt, __FILE__, __LINE__, ## args)
#if TRACE_DEBUG
#define DEBUG(x...) _PRINTVF(2, TRUE, "DEBUG: " x)