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SqMod/module/Vendor/MDBC/libmariadb/dbug.c
Sandu Liviu Catalin 2ee661ee65 Integrate MySQL module.
2020-03-22 14:54:40 +02:00

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/******************************************************************************
* *
* N O T I C E *
* *
* Copyright Abandoned, 1987, Fred Fish *
* *
* *
* This previously copyrighted work has been placed into the public *
* domain by the author and may be freely used for any purpose, *
* private or commercial. *
* *
* Because of the number of inquiries I was receiving about the use *
* of this product in commercially developed works I have decided to *
* simply make it public domain to further its unrestricted use. I *
* specifically would be most happy to see this material become a *
* part of the standard Unix distributions by AT&T and the Berkeley *
* Computer Science Research Group, and a standard part of the GNU *
* system from the Free Software Foundation. *
* *
* I would appreciate it, as a courtesy, if this notice is left in *
* all copies and derivative works. Thank you. *
* *
* The author makes no warranty of any kind with respect to this *
* product and explicitly disclaims any implied warranties of mer- *
* chantability or fitness for any particular purpose. *
* *
******************************************************************************
*/
/*
* FILE
*
* dbug.c runtime support routines for dbug package
*
* SCCS
*
* @(#)dbug.c 1.25 7/25/89
*
* DESCRIPTION
*
* These are the runtime support routines for the dbug package.
* The dbug package has two main components; the user include
* file containing various macro definitions, and the runtime
* support routines which are called from the macro expansions.
*
* Externally visible functions in the runtime support module
* use the naming convention pattern "_db_xx...xx_", thus
* they are unlikely to collide with user defined function names.
*
* AUTHOR(S)
*
* Fred Fish (base code)
* Enhanced Software Technologies, Tempe, AZ
* asuvax!mcdphx!estinc!fnf
*
* Binayak Banerjee (profiling enhancements)
* seismo!bpa!sjuvax!bbanerje
*
* Michael Widenius:
* DBUG_DUMP - To dump a block of memory.
* PUSH_FLAG "O" - To be used insted of "o" if we
* want flushing after each write
* PUSH_FLAG "A" - as 'O', but we will append to the out file instead
* of creating a new one.
* Check of malloc on entry/exit (option "S")
*
* Sergei Golubchik:
* DBUG_EXECUTE_IF
* incremental mode (-#+t:-d,info ...)
* DBUG_SET, _db_explain_
* thread-local settings
* negative lists (-#-d,info => everything but "info")
*
* function/ syntax
* (the logic is - think of a call stack as of a path.
* "function" means only this function, "function/" means the hierarchy.
* in the future, filters like function1/function2 could be supported.
* following this logic glob(7) wildcards are supported.)
*
*/
/*
We can't have SAFE_MUTEX defined here as this will cause recursion
in pthread_mutex_lock
*/
#undef SAFE_MUTEX
#include <my_global.h>
#include <m_string.h>
#include <errno.h>
#ifdef HAVE_FNMATCH_H
#include <fnmatch.h>
#else
#define fnmatch(A,B,C) strcmp(A,B)
#endif
#if defined(_WIN32)
#include <process.h>
#else
#include <sys/time.h>
#include <signal.h>
#endif
extern int my_snprintf(char* to, size_t n, const char* fmt, ...);
char _dig_vec_upper[] =
"0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
char _dig_vec_lower[] =
"0123456789abcdefghijklmnopqrstuvwxyz";
#ifndef DBUG_OFF
/*
* Manifest constants which may be "tuned" if desired.
*/
#define PRINTBUF 1024 /* Print buffer size */
#define INDENT 2 /* Indentation per trace level */
#define MAXDEPTH 200 /* Maximum trace depth default */
/*
* The following flags are used to determine which
* capabilities the user has enabled with the settings
* push macro.
*
* TRACE_ON is also used in _db_stack_frame_->level
* (until we add flags to _db_stack_frame_, increasing it by 4 bytes)
*/
#define DEBUG_ON (1 << 1) /* Debug enabled */
#define FILE_ON (1 << 2) /* File name print enabled */
#define LINE_ON (1 << 3) /* Line number print enabled */
#define DEPTH_ON (1 << 4) /* Function nest level print enabled */
#define PROCESS_ON (1 << 5) /* Process name print enabled */
#define NUMBER_ON (1 << 6) /* Number each line of output */
#define PROFILE_ON (1 << 7) /* Print out profiling code */
#define PID_ON (1 << 8) /* Identify each line with process id */
#define TIMESTAMP_ON (1 << 9) /* timestamp every line of output */
#define FLUSH_ON_WRITE (1 << 10) /* Flush on every write */
#define OPEN_APPEND (1 << 11) /* Open for append */
#define TRACE_ON ((uint)1 << 31) /* Trace enabled. MUST be the highest bit!*/
#define TRACING (cs->stack->flags & TRACE_ON)
#define DEBUGGING (cs->stack->flags & DEBUG_ON)
#define PROFILING (cs->stack->flags & PROFILE_ON)
/*
* Typedefs to make things more obvious.
*/
#define BOOLEAN my_bool
/*
* Make it easy to change storage classes if necessary.
*/
#define IMPORT extern /* Names defined externally */
#define EXPORT /* Allocated here, available globally */
/*
* The default file for profiling. Could also add another flag
* (G?) which allowed the user to specify this.
*
* If the automatic variables get allocated on the stack in
* reverse order from their declarations, then define AUTOS_REVERSE to 1.
* This is used by the code that keeps track of stack usage. For
* forward allocation, the difference in the dbug frame pointers
* represents stack used by the callee function. For reverse allocation,
* the difference represents stack used by the caller function.
*
*/
#define PROF_FILE "dbugmon.out"
#define PROF_EFMT "E\t%ld\t%s\n"
#define PROF_SFMT "S\t%lx\t%lx\t%s\n"
#define PROF_XFMT "X\t%ld\t%s\n"
#ifdef M_I386 /* predefined by xenix 386 compiler */
#define AUTOS_REVERSE 1
#else
#define AUTOS_REVERSE 0
#endif
/*
* Externally supplied functions.
*/
#ifndef HAVE_PERROR
static void perror(); /* Fake system/library error print routine */
#endif
/*
* The user may specify a list of functions to trace or
* debug. These lists are kept in a linear linked list,
* a very simple implementation.
*/
struct link {
struct link *next_link; /* Pointer to the next link */
char flags;
char str[1]; /* Pointer to link's contents */
};
/* flags for struct link and return flags of InList */
#define SUBDIR 1 /* this MUST be 1 */
#define INCLUDE 2
#define EXCLUDE 4
/* this is not a struct link flag, but only a return flags of InList */
#define MATCHED 65536
#define NOT_MATCHED 0
/*
* Debugging settings can be pushed or popped off of a
* stack which is implemented as a linked list. Note
* that the head of the list is the current settings and the
* stack is pushed by adding a new settings to the head of the
* list or popped by removing the first link.
*
* Note: if out_file is NULL, the other fields are not initialized at all!
*/
struct settings {
uint flags; /* Current settings flags */
uint maxdepth; /* Current maximum trace depth */
uint delay; /* Delay after each output line */
uint sub_level; /* Sub this from code_state->level */
FILE *out_file; /* Current output stream */
FILE *prof_file; /* Current profiling stream */
char name[FN_REFLEN]; /* Name of output file */
struct link *functions; /* List of functions */
struct link *p_functions; /* List of profiled functions */
struct link *keywords; /* List of debug keywords */
struct link *processes; /* List of process names */
struct settings *next; /* Next settings in the list */
};
#define is_shared(S, V) ((S)->next && (S)->next->V == (S)->V)
/*
* Local variables not seen by user.
*/
static BOOLEAN init_done= FALSE; /* Set to TRUE when initialization done */
/**
Global debugging settings.
This structure shared between all threads,
and is the last element in each thread @c CODE_STATE::stack chain.
Protected by @c THR_LOCK_init_settings.
*/
static struct settings init_settings;
static const char *db_process= 0;/* Pointer to process name; argv[0] */
my_bool _dbug_on_= TRUE; /* FALSE if no debugging at all */
typedef struct _db_code_state_ {
const char *process; /* Pointer to process name; usually argv[0] */
const char *func; /* Name of current user function */
const char *file; /* Name of current user file */
struct _db_stack_frame_ *framep; /* Pointer to current frame */
struct settings *stack; /* debugging settings */
const char *jmpfunc; /* Remember current function for setjmp */
const char *jmpfile; /* Remember current file for setjmp */
int lineno; /* Current debugger output line number */
uint level; /* Current function nesting level */
int jmplevel; /* Remember nesting level at setjmp() */
/*
* The following variables are used to hold the state information
* between the call to _db_pargs_() and _db_doprnt_(), during
* expansion of the DBUG_PRINT macro. This is the only macro
* that currently uses these variables.
*
* These variables are currently used only by _db_pargs_() and
* _db_doprnt_().
*/
uint u_line; /* User source code line number */
int locked; /* If locked with _db_lock_file_ */
const char *u_keyword; /* Keyword for current macro */
uint m_read_lock_count;
} CODE_STATE;
/*
The test below is so we could call functions with DBUG_ENTER before
my_thread_init().
*/
#define get_code_state_if_not_set_or_return if (!cs && !((cs=code_state()))) return
#define get_code_state_or_return if (!((cs=code_state()))) return
/* Handling lists */
#define ListAdd(A,B,C) ListAddDel(A,B,C,INCLUDE)
#define ListDel(A,B,C) ListAddDel(A,B,C,EXCLUDE)
static struct link *ListAddDel(struct link *, const char *, const char *, int);
static struct link *ListCopy(struct link *);
static int InList(struct link *linkp,const char *cp);
static uint ListFlags(struct link *linkp);
static void FreeList(struct link *linkp);
/* OpenClose debug output stream */
static void DBUGOpenFile(CODE_STATE *,const char *, const char *, int);
static void DBUGCloseFile(CODE_STATE *cs, FILE *fp);
/* Push current debug settings */
static void PushState(CODE_STATE *cs);
/* Free memory associated with debug state. */
static void FreeState (CODE_STATE *cs, struct settings *state, int free_state);
/* Test for tracing enabled */
static int DoTrace(CODE_STATE *cs);
/*
return values of DoTrace.
Can also be used as bitmask: ret & DO_TRACE
*/
#define DO_TRACE 1
#define DONT_TRACE 2
#define ENABLE_TRACE 3
#define DISABLE_TRACE 4
/* Test to see if file is writable */
#if defined(HAVE_ACCESS)
static BOOLEAN Writable(const char *pathname);
#endif
static void DoPrefix(CODE_STATE *cs, uint line);
static char *DbugMalloc(size_t size);
static const char *BaseName(const char *pathname);
static void Indent(CODE_STATE *cs, int indent);
static void DbugFlush(CODE_STATE *);
static void DbugExit(const char *why);
static const char *DbugStrTok(const char *s);
/*
* Miscellaneous printf format strings.
*/
#define ERR_MISSING_RETURN "missing DBUG_RETURN or DBUG_VOID_RETURN macro in function \"%s\"\n"
#define ERR_MISSING_UNLOCK "missing DBUG_UNLOCK_FILE macro in function \"%s\"\n"
#define ERR_OPEN "%s: can't open debug output stream \"%s\": "
#define ERR_CLOSE "%s: can't close debug file: "
#define ERR_ABORT "%s: debugger aborting because %s\n"
/*
* Macros and defines for testing file accessibility under UNIX and MSDOS.
*/
#undef EXISTS
#if !defined(HAVE_ACCESS)
#define EXISTS(pathname) (FALSE) /* Assume no existance */
#define Writable(name) (TRUE)
#else
#define EXISTS(pathname) (access(pathname, F_OK) == 0)
#define WRITABLE(pathname) (access(pathname, W_OK) == 0)
#endif
/*
** Macros to allow dbugging with threads
*/
#include <my_pthread.h>
static pthread_mutex_t THR_LOCK_dbug;
/**
A mutex protecting flushing of gcov data, see _db_flush_gcov_().
We don't re-use THR_LOCK_dbug, because that would disallow:
DBUG_LOCK_FILE; ..... DBUG_SUICIDE(); .... DBUG_UNLOCK_FILE;
*/
static pthread_mutex_t THR_LOCK_gcov;
static pthread_mutex_t THR_LOCK_init_settings;
static CODE_STATE *code_state(void)
{
CODE_STATE *cs, **cs_ptr;
/*
_dbug_on_ is reset if we don't plan to use any debug commands at all and
we want to run on maximum speed
*/
if (!_dbug_on_)
return 0;
if (!init_done)
{
init_done=TRUE;
pthread_mutex_init(&THR_LOCK_dbug, NULL);
pthread_mutex_init(&THR_LOCK_gcov, NULL);
pthread_mutex_init(&THR_LOCK_init_settings, NULL);
memset(&init_settings, 0, sizeof(init_settings));
init_settings.out_file=stderr;
init_settings.flags=OPEN_APPEND;
}
if (!(cs_ptr= (CODE_STATE**) my_thread_var_dbug()))
return 0; /* Thread not initialised */
if (!(cs= *cs_ptr))
{
cs=(CODE_STATE*) DbugMalloc(sizeof(*cs));
memset(cs, 0, sizeof(*cs));
cs->process= db_process ? db_process : "dbug";
cs->func="?func";
cs->file="?file";
cs->stack=&init_settings;
cs->m_read_lock_count= 0;
*cs_ptr= cs;
}
return cs;
}
/**
Lock the stack debugging settings.
Only the shared (global) settings are locked if necessary,
per thread settings are local and safe to use.
This lock is re entrant.
@sa unlock_stack
*/
static void read_lock_stack(CODE_STATE *cs)
{
if (cs->stack == &init_settings)
{
if (++(cs->m_read_lock_count) == 1)
pthread_mutex_lock(&THR_LOCK_init_settings);
}
}
/**
Unlock the stack debugging settings.
@sa read_lock_stack
*/
static void unlock_stack(CODE_STATE *cs)
{
if (cs->stack == &init_settings)
{
if (--(cs->m_read_lock_count) == 0)
pthread_mutex_unlock(&THR_LOCK_init_settings);
}
}
/*
* Translate some calls among different systems.
*/
#ifdef HAVE_SLEEP
/* sleep() wants seconds */
#define Delay(A) sleep(((uint) A)/10)
#else
#define Delay(A) (0)
#endif
/*
* FUNCTION
*
* _db_process_ give the name to the current process/thread
*
* SYNOPSIS
*
* VOID _process_(name)
* char *name;
*
*/
void _db_process_(const char *name)
{
CODE_STATE *cs;
if (!db_process)
db_process= name;
get_code_state_or_return;
cs->process= name;
}
/*
* FUNCTION
*
* DbugParse parse control string and set current debugger settings
*
* DESCRIPTION
*
* Given pointer to a debug control string in "control",
* parses the control string, and sets
* up a current debug settings.
*
* The debug control string is a sequence of colon separated fields
* as follows:
*
* [+]<field_1>:<field_2>:...:<field_N>
*
* Each field consists of a mandatory flag character followed by
* an optional "," and comma separated list of modifiers:
*
* [sign]flag[,modifier,modifier,...,modifier]
*
* See the manual for the list of supported signs, flags, and modifiers
*
* For convenience, any leading "-#" is stripped off.
*
* RETURN
* 1 - a list of functions ("f" flag) was possibly changed
* 0 - a list of functions was not changed
*/
int DbugParse(CODE_STATE *cs, const char *control)
{
const char *end;
int rel, f_used=0;
struct settings *stack;
/*
Make sure we are not changing settings while inside a
DBUG_LOCK_FILE
DBUG_UNLOCK_FILE
section, that is a mis use, that would cause changing
DBUG_FILE while the caller prints to it.
*/
assert(! cs->locked);
stack= cs->stack;
/*
When parsing the global init_settings itself,
make sure to block every other thread using dbug functions.
*/
assert(cs->m_read_lock_count == 0);
if (stack == &init_settings)
pthread_mutex_lock(&THR_LOCK_init_settings);
if (control[0] == '-' && control[1] == '#')
control+=2;
rel= control[0] == '+' || control[0] == '-';
if ((!rel || (!stack->out_file && !stack->next)))
{
/* Free memory associated with the state before resetting its members */
FreeState(cs, stack, 0);
stack->flags= 0;
stack->delay= 0;
stack->maxdepth= 0;
stack->sub_level= 0;
stack->out_file= stderr;
stack->prof_file= NULL;
stack->functions= NULL;
stack->p_functions= NULL;
stack->keywords= NULL;
stack->processes= NULL;
}
else if (!stack->out_file)
{
stack->flags= stack->next->flags;
stack->delay= stack->next->delay;
stack->maxdepth= stack->next->maxdepth;
stack->sub_level= stack->next->sub_level;
strcpy(stack->name, stack->next->name);
stack->prof_file= stack->next->prof_file;
if (stack->next == &init_settings)
{
assert(stack != &init_settings);
pthread_mutex_lock(&THR_LOCK_init_settings);
/*
Never share with the global parent - it can change under your feet.
Reset out_file to stderr to prevent sharing of trace files between
global and session settings.
*/
stack->out_file= stderr;
stack->functions= ListCopy(init_settings.functions);
stack->p_functions= ListCopy(init_settings.p_functions);
stack->keywords= ListCopy(init_settings.keywords);
stack->processes= ListCopy(init_settings.processes);
pthread_mutex_unlock(&THR_LOCK_init_settings);
}
else
{
stack->out_file= stack->next->out_file;
stack->functions= stack->next->functions;
stack->p_functions= stack->next->p_functions;
stack->keywords= stack->next->keywords;
stack->processes= stack->next->processes;
}
}
end= DbugStrTok(control);
while (control < end)
{
int c, sign= (*control == '+') ? 1 : (*control == '-') ? -1 : 0;
if (sign) control++;
c= *control++;
if (*control == ',') control++;
/* XXX when adding new cases here, don't forget _db_explain_ ! */
switch (c) {
case 'd':
if (sign < 0 && control == end)
{
if (!is_shared(stack, keywords))
FreeList(stack->keywords);
stack->keywords=NULL;
stack->flags &= ~DEBUG_ON;
break;
}
if (rel && is_shared(stack, keywords))
stack->keywords= ListCopy(stack->keywords);
if (sign < 0)
{
if (DEBUGGING)
stack->keywords= ListDel(stack->keywords, control, end);
break;
}
stack->keywords= ListAdd(stack->keywords, control, end);
stack->flags |= DEBUG_ON;
break;
case 'D':
stack->delay= atoi(control);
break;
case 'f':
f_used= 1;
if (sign < 0 && control == end)
{
if (!is_shared(stack,functions))
FreeList(stack->functions);
stack->functions=NULL;
break;
}
if (rel && is_shared(stack,functions))
stack->functions= ListCopy(stack->functions);
if (sign < 0)
stack->functions= ListDel(stack->functions, control, end);
else
stack->functions= ListAdd(stack->functions, control, end);
break;
case 'F':
if (sign < 0)
stack->flags &= ~FILE_ON;
else
stack->flags |= FILE_ON;
break;
case 'i':
if (sign < 0)
stack->flags &= ~PID_ON;
else
stack->flags |= PID_ON;
break;
case 'L':
if (sign < 0)
stack->flags &= ~LINE_ON;
else
stack->flags |= LINE_ON;
break;
case 'n':
if (sign < 0)
stack->flags &= ~DEPTH_ON;
else
stack->flags |= DEPTH_ON;
break;
case 'N':
if (sign < 0)
stack->flags &= ~NUMBER_ON;
else
stack->flags |= NUMBER_ON;
break;
case 'A':
case 'O':
stack->flags |= FLUSH_ON_WRITE;
/* fall through */
case 'a':
case 'o':
/* In case we already have an open file. */
if (!is_shared(stack, out_file))
DBUGCloseFile(cs, stack->out_file);
if (sign < 0)
{
stack->flags &= ~FLUSH_ON_WRITE;
stack->out_file= stderr;
break;
}
if (c == 'a' || c == 'A')
stack->flags |= OPEN_APPEND;
else
stack->flags &= ~OPEN_APPEND;
if (control != end)
DBUGOpenFile(cs, control, end, stack->flags & OPEN_APPEND);
else
DBUGOpenFile(cs, "-",0,0);
break;
case 'p':
if (sign < 0 && control == end)
{
if (!is_shared(stack,processes))
FreeList(stack->processes);
stack->processes=NULL;
break;
}
if (rel && is_shared(stack, processes))
stack->processes= ListCopy(stack->processes);
if (sign < 0)
stack->processes= ListDel(stack->processes, control, end);
else
stack->processes= ListAdd(stack->processes, control, end);
break;
case 'P':
if (sign < 0)
stack->flags &= ~PROCESS_ON;
else
stack->flags |= PROCESS_ON;
break;
case 'r':
stack->sub_level= cs->level;
break;
case 't':
if (sign < 0)
{
if (control != end)
stack->maxdepth-= atoi(control);
else
stack->maxdepth= 0;
}
else
{
if (control != end)
stack->maxdepth+= atoi(control);
else
stack->maxdepth= MAXDEPTH;
}
if (stack->maxdepth > 0)
stack->flags |= TRACE_ON;
else
stack->flags &= ~TRACE_ON;
break;
case 'T':
if (sign < 0)
stack->flags &= ~TIMESTAMP_ON;
else
stack->flags |= TIMESTAMP_ON;
break;
}
if (!*end)
break;
control=end+1;
end= DbugStrTok(control);
}
if (stack->next == &init_settings)
{
/*
Enforce nothing is shared with the global init_settings
*/
assert((stack->functions == NULL) || (stack->functions != init_settings.functions));
assert((stack->p_functions == NULL) || (stack->p_functions != init_settings.p_functions));
assert((stack->keywords == NULL) || (stack->keywords != init_settings.keywords));
assert((stack->processes == NULL) || (stack->processes != init_settings.processes));
}
if (stack == &init_settings)
pthread_mutex_unlock(&THR_LOCK_init_settings);
return !rel || f_used;
}
#define framep_trace_flag(cs, frp) (frp ? \
frp->level & TRACE_ON : \
(ListFlags(cs->stack->functions) & INCLUDE) ? \
0 : (uint)TRACE_ON)
void FixTraceFlags_helper(CODE_STATE *cs, const char *func,
struct _db_stack_frame_ *framep)
{
if (framep->prev)
FixTraceFlags_helper(cs, framep->func, framep->prev);
cs->func= func;
cs->level= framep->level & ~TRACE_ON;
framep->level= cs->level | framep_trace_flag(cs, framep->prev);
/*
we don't set cs->framep correctly, even though DoTrace uses it.
It's ok, because cs->framep may only affect DO_TRACE/DONT_TRACE return
values, but we ignore them here anyway
*/
switch(DoTrace(cs)) {
case ENABLE_TRACE:
framep->level|= TRACE_ON;
break;
case DISABLE_TRACE:
framep->level&= ~TRACE_ON;
break;
}
}
#define fflags(cs) cs->stack->out_file ? ListFlags(cs->stack->functions) : TRACE_ON;
void FixTraceFlags(uint old_fflags, CODE_STATE *cs)
{
const char *func;
uint new_fflags, traceon, level;
struct _db_stack_frame_ *framep;
/*
first (a.k.a. safety) check:
if we haven't started tracing yet, no call stack at all - we're safe.
*/
framep=cs->framep;
if (framep == 0)
return;
/*
Ok, the tracing has started, call stack isn't empty.
second check: does the new list have a SUBDIR rule ?
*/
new_fflags=fflags(cs);
if (new_fflags & SUBDIR)
goto yuck;
/*
Ok, new list doesn't use SUBDIR.
third check: we do NOT need to re-scan if
neither old nor new lists used SUBDIR flag and if a default behavior
(whether an unlisted function is traced) hasn't changed.
Default behavior depends on whether there're INCLUDE elements in the list.
*/
if (!(old_fflags & SUBDIR) && !((new_fflags^old_fflags) & INCLUDE))
return;
/*
Ok, old list may've used SUBDIR, or defaults could've changed.
fourth check: are we inside a currently active SUBDIR rule ?
go up the call stack, if TRACE_ON flag ever changes its value - we are.
*/
for (traceon=framep->level; framep; framep=framep->prev)
if ((traceon ^ framep->level) & TRACE_ON)
goto yuck;
/*
Ok, TRACE_ON flag doesn't change in the call stack.
fifth check: but is the top-most value equal to a default one ?
*/
if (((traceon & TRACE_ON) != 0) == ((new_fflags & INCLUDE) == 0))
return;
yuck:
/*
Yuck! function list was changed, and one of the currently active rules
was possibly affected. For example, a tracing could've been enabled or
disabled for a function somewhere up the call stack.
To react correctly, we must go up the call stack all the way to
the top and re-match rules to set TRACE_ON bit correctly.
We must traverse the stack forwards, not backwards.
That's what a recursive helper is doing.
It'll destroy two CODE_STATE fields, save them now.
*/
func= cs->func;
level= cs->level;
FixTraceFlags_helper(cs, func, cs->framep);
/* now we only need to restore CODE_STATE fields, and we're done */
cs->func= func;
cs->level= level;
}
/*
* FUNCTION
*
* _db_set_ set current debugger settings
*
* SYNOPSIS
*
* VOID _db_set_(control)
* char *control;
*
* DESCRIPTION
*
* Given pointer to a debug control string in "control",
* parses the control string, and sets up a current debug
* settings. Pushes a new debug settings if the current is
* set to the initial debugger settings.
*
*/
void _db_set_(const char *control)
{
CODE_STATE *cs;
uint old_fflags;
get_code_state_or_return;
read_lock_stack(cs);
old_fflags=fflags(cs);
unlock_stack(cs);
if (cs->stack == &init_settings)
PushState(cs);
if (DbugParse(cs, control))
{
read_lock_stack(cs);
FixTraceFlags(old_fflags, cs);
unlock_stack(cs);
}
}
/*
* FUNCTION
*
* _db_push_ push current debugger settings and set up new one
*
* SYNOPSIS
*
* VOID _db_push_(control)
* char *control;
*
* DESCRIPTION
*
* Given pointer to a debug control string in "control", pushes
* the current debug settings, parses the control string, and sets
* up a new debug settings with DbugParse()
*
*/
void _db_push_(const char *control)
{
CODE_STATE *cs;
uint old_fflags;
get_code_state_or_return;
read_lock_stack(cs);
old_fflags=fflags(cs);
unlock_stack(cs);
PushState(cs);
if (DbugParse(cs, control))
{
read_lock_stack(cs);
FixTraceFlags(old_fflags, cs);
unlock_stack(cs);
}
}
/**
Returns TRUE if session-local settings have been set.
*/
int _db_is_pushed_()
{
CODE_STATE *cs= NULL;
get_code_state_or_return FALSE;
return (cs->stack != &init_settings);
}
/*
* FUNCTION
*
* _db_set_init_ set initial debugger settings
*
* SYNOPSIS
*
* VOID _db_set_init_(control)
* char *control;
*
* DESCRIPTION
* see _db_set_
*
*/
void _db_set_init_(const char *control)
{
CODE_STATE tmp_cs;
memset(&tmp_cs, 0, sizeof(tmp_cs));
tmp_cs.stack= &init_settings;
tmp_cs.process= db_process ? db_process : "dbug";
DbugParse(&tmp_cs, control);
}
/*
* FUNCTION
*
* _db_pop_ pop the debug stack
*
* DESCRIPTION
*
* Pops the debug stack, returning the debug settings to its
* condition prior to the most recent _db_push_ invocation.
* Note that the pop will fail if it would remove the last
* valid settings from the stack. This prevents user errors
* in the push/pop sequence from screwing up the debugger.
* Maybe there should be some kind of warning printed if the
* user tries to pop too many states.
*
*/
void _db_pop_()
{
struct settings *discard;
uint old_fflags;
CODE_STATE *cs;
get_code_state_or_return;
discard= cs->stack;
if (discard != &init_settings)
{
read_lock_stack(cs);
old_fflags=fflags(cs);
unlock_stack(cs);
cs->stack= discard->next;
FreeState(cs, discard, 1);
read_lock_stack(cs);
FixTraceFlags(old_fflags, cs);
unlock_stack(cs);
}
}
/*
* FUNCTION
*
* _db_explain_ generates 'control' string for the current settings
*
* RETURN
* 0 - ok
* 1 - buffer too short, output truncated
*
*/
/* helper macros */
#define char_to_buf(C) do { \
*buf++=(C); \
if (buf >= end) goto overflow; \
} while (0)
#define str_to_buf(S) do { \
char_to_buf(','); \
buf=strnmov(buf, (S), len+1); \
if (buf >= end) goto overflow; \
} while (0)
#define list_to_buf(l, f) do { \
struct link *listp=(l); \
while (listp) \
{ \
if (listp->flags & (f)) \
{ \
str_to_buf(listp->str); \
if (listp->flags & SUBDIR) \
char_to_buf('/'); \
} \
listp=listp->next_link; \
} \
} while (0)
#define int_to_buf(i) do { \
char b[50]; \
int10_to_str((i), b, 10); \
str_to_buf(b); \
} while (0)
#define colon_to_buf do { \
if (buf != start) char_to_buf(':'); \
} while(0)
#define op_int_to_buf(C, val, def) do { \
if ((val) != (def)) \
{ \
colon_to_buf; \
char_to_buf((C)); \
int_to_buf(val); \
} \
} while (0)
#define op_intf_to_buf(C, val, def, cond) do { \
if ((cond)) \
{ \
colon_to_buf; \
char_to_buf((C)); \
if ((val) != (def)) int_to_buf(val); \
} \
} while (0)
#define op_str_to_buf(C, val, cond) do { \
if ((cond)) \
{ \
char *s=(val); \
colon_to_buf; \
char_to_buf((C)); \
if (*s) str_to_buf(s); \
} \
} while (0)
#define op_list_to_buf(C, val, cond) do { \
if ((cond)) \
{ \
int f=ListFlags(val); \
colon_to_buf; \
char_to_buf((C)); \
if (f & INCLUDE) \
list_to_buf(val, INCLUDE); \
if (f & EXCLUDE) \
{ \
colon_to_buf; \
char_to_buf('-'); \
char_to_buf((C)); \
list_to_buf(val, EXCLUDE); \
} \
} \
} while (0)
#define op_bool_to_buf(C, cond) do { \
if ((cond)) \
{ \
colon_to_buf; \
char_to_buf((C)); \
} \
} while (0)
int _db_explain_ (CODE_STATE *cs, char *buf, size_t len)
{
char *start=buf, *end=buf+len-4;
get_code_state_if_not_set_or_return *buf=0;
read_lock_stack(cs);
op_list_to_buf('d', cs->stack->keywords, DEBUGGING);
op_int_to_buf ('D', cs->stack->delay, 0);
op_list_to_buf('f', cs->stack->functions, cs->stack->functions);
op_bool_to_buf('F', cs->stack->flags & FILE_ON);
op_bool_to_buf('i', cs->stack->flags & PID_ON);
op_list_to_buf('g', cs->stack->p_functions, PROFILING);
op_bool_to_buf('L', cs->stack->flags & LINE_ON);
op_bool_to_buf('n', cs->stack->flags & DEPTH_ON);
op_bool_to_buf('N', cs->stack->flags & NUMBER_ON);
op_str_to_buf(
((cs->stack->flags & FLUSH_ON_WRITE ? 0 : 32) |
(cs->stack->flags & OPEN_APPEND ? 'A' : 'O')),
cs->stack->name, cs->stack->out_file != stderr);
op_list_to_buf('p', cs->stack->processes, cs->stack->processes);
op_bool_to_buf('P', cs->stack->flags & PROCESS_ON);
op_bool_to_buf('r', cs->stack->sub_level != 0);
op_intf_to_buf('t', cs->stack->maxdepth, MAXDEPTH, TRACING);
op_bool_to_buf('T', cs->stack->flags & TIMESTAMP_ON);
unlock_stack(cs);
*buf= '\0';
return 0;
overflow:
*end++= '.';
*end++= '.';
*end++= '.';
*end= '\0';
unlock_stack(cs);
return 1;
}
#undef char_to_buf
#undef str_to_buf
#undef list_to_buf
#undef int_to_buf
#undef colon_to_buf
#undef op_int_to_buf
#undef op_intf_to_buf
#undef op_str_to_buf
#undef op_list_to_buf
#undef op_bool_to_buf
/*
* FUNCTION
*
* _db_explain_init_ explain initial debugger settings
*
* DESCRIPTION
* see _db_explain_
*/
int _db_explain_init_(char *buf, size_t len)
{
CODE_STATE cs;
memset(&cs, 0, sizeof(cs));
cs.stack=&init_settings;
return _db_explain_(&cs, buf, len);
}
/*
* FUNCTION
*
* _db_enter_ process entry point to user function
*
* SYNOPSIS
*
* VOID _db_enter_(_func_, _file_, _line_, _stack_frame_)
* char *_func_; points to current function name
* char *_file_; points to current file name
* int _line_; called from source line number
* struct _db_stack_frame_ allocated on the caller's stack
*
* DESCRIPTION
*
* Called at the beginning of each user function to tell
* the debugger that a new function has been entered.
* Note that the pointers to the previous user function
* name and previous user file name are stored on the
* caller's stack (this is why the ENTER macro must be
* the first "executable" code in a function, since it
* allocates these storage locations). The previous nesting
* level is also stored on the callers stack for internal
* self consistency checks.
*
* Also prints a trace line if tracing is enabled and
* increments the current function nesting depth.
*
* Note that this mechanism allows the debugger to know
* what the current user function is at all times, without
* maintaining an internal stack for the function names.
*
*/
void _db_enter_(const char *_func_, const char *_file_,
uint _line_, struct _db_stack_frame_ *_stack_frame_)
{
int save_errno;
CODE_STATE *cs;
if (!((cs=code_state())))
{
_stack_frame_->level= 0; /* Set to avoid valgrind warnings if dbug is enabled later */
_stack_frame_->prev= 0;
return;
}
save_errno= errno;
read_lock_stack(cs);
_stack_frame_->func= cs->func;
_stack_frame_->file= cs->file;
cs->func= _func_;
cs->file= _file_;
_stack_frame_->prev= cs->framep;
_stack_frame_->level= ++cs->level | framep_trace_flag(cs, cs->framep);
cs->framep= _stack_frame_;
switch (DoTrace(cs)) {
case ENABLE_TRACE:
cs->framep->level|= TRACE_ON;
if (!TRACING) break;
/* fall through */
case DO_TRACE:
if (TRACING)
{
if (!cs->locked)
pthread_mutex_lock(&THR_LOCK_dbug);
DoPrefix(cs, _line_);
Indent(cs, cs->level);
(void) fprintf(cs->stack->out_file, ">%s\n", cs->func);
DbugFlush(cs); /* This does a unlock */
}
break;
case DISABLE_TRACE:
cs->framep->level&= ~TRACE_ON;
/* fall through */
case DONT_TRACE:
break;
}
errno=save_errno;
unlock_stack(cs);
}
/*
* FUNCTION
*
* _db_return_ process exit from user function
*
* SYNOPSIS
*
* VOID _db_return_(_line_, _stack_frame_)
* int _line_; current source line number
* struct _db_stack_frame_ allocated on the caller's stack
*
* DESCRIPTION
*
* Called just before user function executes an explicit or implicit
* return. Prints a trace line if trace is enabled, decrements
* the current nesting level, and restores the current function and
* file names from the defunct function's stack.
*
*/
void _db_return_(uint _line_, struct _db_stack_frame_ *_stack_frame_)
{
int save_errno=errno;
uint _slevel_= _stack_frame_->level & ~TRACE_ON;
CODE_STATE *cs;
get_code_state_or_return;
if (cs->framep != _stack_frame_)
{
char buf[512];
my_snprintf(buf, sizeof(buf), ERR_MISSING_RETURN, cs->func);
DbugExit(buf);
}
read_lock_stack(cs);
if (DoTrace(cs) & DO_TRACE)
{
if (TRACING)
{
if (!cs->locked)
pthread_mutex_lock(&THR_LOCK_dbug);
DoPrefix(cs, _line_);
Indent(cs, cs->level);
(void) fprintf(cs->stack->out_file, "<%s %u\n", cs->func, _line_);
DbugFlush(cs);
}
}
/*
Check to not set level < 0. This can happen if DBUG was disabled when
function was entered and enabled in function.
*/
cs->level= _slevel_ != 0 ? _slevel_ - 1 : 0;
cs->func= _stack_frame_->func;
cs->file= _stack_frame_->file;
if (cs->framep != NULL)
cs->framep= cs->framep->prev;
errno=save_errno;
unlock_stack(cs);
}
/*
* FUNCTION
*
* _db_pargs_ log arguments for subsequent use by _db_doprnt_()
*
* SYNOPSIS
*
* VOID _db_pargs_(_line_, keyword)
* int _line_;
* char *keyword;
*
* DESCRIPTION
*
* The new universal printing macro DBUG_PRINT, which replaces
* all forms of the DBUG_N macros, needs two calls to runtime
* support routines. The first, this function, remembers arguments
* that are used by the subsequent call to _db_doprnt_().
*
*/
void _db_pargs_(uint _line_, const char *keyword)
{
CODE_STATE *cs;
get_code_state_or_return;
cs->u_line= _line_;
cs->u_keyword= keyword;
}
/*
* FUNCTION
*
* _db_doprnt_ handle print of debug lines
*
* SYNOPSIS
*
* VOID _db_doprnt_(format, va_alist)
* char *format;
* va_dcl;
*
* DESCRIPTION
*
* When invoked via one of the DBUG macros, tests the current keyword
* set by calling _db_pargs_() to see if that macro has been selected
* for processing via the debugger control string, and if so, handles
* printing of the arguments via the format string. The line number
* of the DBUG macro in the source is found in u_line.
*
* Note that the format string SHOULD NOT include a terminating
* newline, this is supplied automatically.
*
*/
#include <stdarg.h>
void _db_doprnt_(const char *format,...)
{
va_list args;
CODE_STATE *cs;
get_code_state_or_return;
/* Dirty read, for DBUG_PRINT() performance. */
if (! DEBUGGING)
return;
va_start(args,format);
read_lock_stack(cs);
if (_db_keyword_(cs, cs->u_keyword, 0))
{
int save_errno=errno;
if (!cs->locked)
pthread_mutex_lock(&THR_LOCK_dbug);
DoPrefix(cs, cs->u_line);
if (TRACING)
Indent(cs, cs->level + 1);
else
(void) fprintf(cs->stack->out_file, "%s: ", cs->func);
(void) fprintf(cs->stack->out_file, "%s: ", cs->u_keyword);
(void) vfprintf(cs->stack->out_file, format, args);
DbugFlush(cs);
errno=save_errno;
}
unlock_stack(cs);
va_end(args);
}
/*
* FUNCTION
*
* _db_dump_ dump a string in hex
*
* SYNOPSIS
*
* void _db_dump_(_line_,keyword,memory,length)
* int _line_; current source line number
* char *keyword;
* char *memory; Memory to print
* int length; Bytes to print
*
* DESCRIPTION
* Dump N characters in a binary array.
* Is used to examine corrupted memory or arrays.
*/
void _db_dump_(uint _line_, const char *keyword,
const unsigned char *memory, size_t length)
{
int pos;
CODE_STATE *cs;
get_code_state_or_return;
/* Dirty read, for DBUG_DUMP() performance. */
if (! DEBUGGING)
return;
read_lock_stack(cs);
if (_db_keyword_(cs, keyword, 0))
{
if (!cs->locked)
pthread_mutex_lock(&THR_LOCK_dbug);
DoPrefix(cs, _line_);
if (TRACING)
{
Indent(cs, cs->level + 1);
pos= MIN(MAX(cs->level-cs->stack->sub_level,0)*INDENT,80);
}
else
{
fprintf(cs->stack->out_file, "%s: ", cs->func);
}
(void) fprintf(cs->stack->out_file, "%s: Memory: 0x%lx Bytes: (%ld)\n",
keyword, (ulong) memory, (long) length);
pos=0;
while (length-- > 0)
{
uint tmp= *((unsigned char*) memory++);
if ((pos+=3) >= 80)
{
fputc('\n',cs->stack->out_file);
pos=3;
}
fputc(_dig_vec_upper[((tmp >> 4) & 15)], cs->stack->out_file);
fputc(_dig_vec_upper[tmp & 15], cs->stack->out_file);
fputc(' ',cs->stack->out_file);
}
(void) fputc('\n',cs->stack->out_file);
DbugFlush(cs);
}
unlock_stack(cs);
}
/*
* FUNCTION
*
* ListAddDel modify the list according to debug control string
*
* DESCRIPTION
*
* Given pointer to a comma separated list of strings in "cltp",
* parses the list, and modifies "listp", returning a pointer
* to the new list.
*
* The mode of operation is defined by "todo" parameter.
*
* If it is INCLUDE, elements (strings from "cltp") are added to the
* list, they will have INCLUDE flag set. If the list already contains
* the string in question, new element is not added, but a flag of
* the existing element is adjusted (INCLUDE bit is set, EXCLUDE bit
* is removed).
*
* If it is EXCLUDE, elements are added to the list with the EXCLUDE
* flag set. If the list already contains the string in question,
* it is removed, new element is not added.
*/
static struct link *ListAddDel(struct link *head, const char *ctlp,
const char *end, int todo)
{
const char *start;
struct link **cur;
size_t len;
int subdir;
ctlp--;
next:
while (++ctlp < end)
{
start= ctlp;
subdir=0;
while (ctlp < end && *ctlp != ',')
ctlp++;
len=ctlp-start;
if (start[len-1] == '/')
{
len--;
subdir=SUBDIR;
}
if (len == 0) continue;
for (cur=&head; *cur; cur=&((*cur)->next_link))
{
if (!strncmp((*cur)->str, start, len))
{
if ((*cur)->flags & todo) /* same action ? */
(*cur)->flags|= subdir; /* just merge the SUBDIR flag */
else if (todo == EXCLUDE)
{
struct link *delme=*cur;
*cur=(*cur)->next_link;
free((void*) delme);
}
else
{
(*cur)->flags&=~(EXCLUDE | SUBDIR);
(*cur)->flags|=INCLUDE | subdir;
}
goto next;
}
}
*cur= (struct link *) DbugMalloc(sizeof(struct link)+len);
memcpy((*cur)->str, start, len);
(*cur)->str[len]=0;
(*cur)->flags=todo | subdir;
(*cur)->next_link=0;
}
return head;
}
/*
* FUNCTION
*
* ListCopy make a copy of the list
*
* SYNOPSIS
*
* static struct link *ListCopy(orig)
* struct link *orig;
*
* DESCRIPTION
*
* Given pointer to list, which contains a copy of every element from
* the original list.
*
* the orig pointer can be NULL
*
* Note that since each link is added at the head of the list,
* the final list will be in "reverse order", which is not
* significant for our usage here.
*
*/
static struct link *ListCopy(struct link *orig)
{
struct link *new_malloc;
struct link *head;
size_t len;
head= NULL;
while (orig != NULL)
{
len= strlen(orig->str);
new_malloc= (struct link *) DbugMalloc(sizeof(struct link)+len);
memcpy(new_malloc->str, orig->str, len);
new_malloc->str[len]= 0;
new_malloc->flags=orig->flags;
new_malloc->next_link= head;
head= new_malloc;
orig= orig->next_link;
}
return head;
}
/*
* FUNCTION
*
* InList test a given string for member of a given list
*
* DESCRIPTION
*
* Tests the string pointed to by "cp" to determine if it is in
* the list pointed to by "linkp". Linkp points to the first
* link in the list. If linkp is NULL or contains only EXCLUDE
* elements then the string is treated as if it is in the list.
* This may seem rather strange at first but leads to the desired
* operation if no list is given. The net effect is that all
* strings will be accepted when there is no list, and when there
* is a list, only those strings in the list will be accepted.
*
* RETURN
* combination of SUBDIR, INCLUDE, EXCLUDE, MATCHED flags
*
*/
static int InList(struct link *linkp, const char *cp)
{
int result;
for (result=MATCHED; linkp != NULL; linkp= linkp->next_link)
{
if (!fnmatch(linkp->str, cp, 0))
return linkp->flags;
if (!(linkp->flags & EXCLUDE))
result=NOT_MATCHED;
if (linkp->flags & SUBDIR)
result|=SUBDIR;
}
return result;
}
/*
* FUNCTION
*
* ListFlags returns aggregated list flags (ORed over all elements)
*
*/
static uint ListFlags(struct link *linkp)
{
uint f;
for (f=0; linkp != NULL; linkp= linkp->next_link)
f|= linkp->flags;
return f;
}
/*
* FUNCTION
*
* PushState push current settings onto stack and set up new one
*
* SYNOPSIS
*
* static VOID PushState()
*
* DESCRIPTION
*
* Pushes the current settings on the settings stack, and creates
* a new settings. The new settings is NOT initialized
*
* The settings stack is a linked list of settings, with the new
* settings added at the head. This allows the stack to grow
* to the limits of memory if necessary.
*
*/
static void PushState(CODE_STATE *cs)
{
struct settings *new_malloc;
new_malloc= (struct settings *) DbugMalloc(sizeof(struct settings));
memset(new_malloc, 0, sizeof(struct settings));
new_malloc->next= cs->stack;
cs->stack= new_malloc;
}
/*
* FUNCTION
*
* FreeState Free memory associated with a struct state.
*
* SYNOPSIS
*
* static void FreeState (state)
* struct state *state;
* int free_state;
*
* DESCRIPTION
*
* Deallocates the memory allocated for various information in a
* state. If free_state is set, also free 'state'
*
*/
static void FreeState(CODE_STATE *cs, struct settings *state, int free_state)
{
if (!is_shared(state, keywords))
FreeList(state->keywords);
if (!is_shared(state, functions))
FreeList(state->functions);
if (!is_shared(state, processes))
FreeList(state->processes);
if (!is_shared(state, p_functions))
FreeList(state->p_functions);
if (!is_shared(state, out_file))
DBUGCloseFile(cs, state->out_file);
else
(void) fflush(state->out_file);
if (!is_shared(state, prof_file))
DBUGCloseFile(cs, state->prof_file);
else
(void) fflush(state->prof_file);
if (free_state)
free((void*) state);
}
/*
* FUNCTION
*
* _db_end_ End debugging, freeing state stack memory.
*
* SYNOPSIS
*
* static VOID _db_end_ ()
*
* DESCRIPTION
*
* Ends debugging, de-allocating the memory allocated to the
* state stack.
*
* To be called at the very end of the program.
*
*/
void _db_end_()
{
struct settings *discard;
static struct settings tmp;
CODE_STATE *cs;
/*
Set _dbug_on_ to be able to do full reset even when DEBUGGER_OFF was
called after dbug was initialized
*/
_dbug_on_= 1;
get_code_state_or_return;
/*
The caller may have missed a DBUG_UNLOCK_FILE,
we are breaking this lock to enforce DBUG_END can proceed.
*/
if (cs->locked)
{
fprintf(stderr, ERR_MISSING_UNLOCK, "(unknown)");
cs->locked= 0;
pthread_mutex_unlock(&THR_LOCK_dbug);
}
while ((discard= cs->stack))
{
if (discard == &init_settings)
break;
cs->stack= discard->next;
FreeState(cs, discard, 1);
}
pthread_mutex_lock(&THR_LOCK_init_settings);
tmp= init_settings;
init_settings.flags= OPEN_APPEND;
init_settings.out_file= stderr;
init_settings.prof_file= stderr;
init_settings.maxdepth= 0;
init_settings.delay= 0;
init_settings.sub_level= 0;
init_settings.functions= 0;
init_settings.p_functions= 0;
init_settings.keywords= 0;
init_settings.processes= 0;
pthread_mutex_unlock(&THR_LOCK_init_settings);
FreeState(cs, &tmp, 0);
}
/*
* FUNCTION
*
* DoTrace check to see if tracing is current enabled
*
* DESCRIPTION
*
* Checks to see if dbug in this function is enabled based on
* whether the maximum trace depth has been reached, the current
* function is selected, and the current process is selected.
*
*/
static int DoTrace(CODE_STATE *cs)
{
if ((cs->stack->maxdepth == 0 || cs->level <= cs->stack->maxdepth) &&
InList(cs->stack->processes, cs->process) & (MATCHED|INCLUDE))
switch(InList(cs->stack->functions, cs->func)) {
case INCLUDE|SUBDIR: return ENABLE_TRACE;
case INCLUDE: return DO_TRACE;
case MATCHED|SUBDIR:
case NOT_MATCHED|SUBDIR:
case MATCHED: return framep_trace_flag(cs, cs->framep) ?
DO_TRACE : DONT_TRACE;
case EXCLUDE:
case NOT_MATCHED: return DONT_TRACE;
case EXCLUDE|SUBDIR: return DISABLE_TRACE;
}
return DONT_TRACE;
}
FILE *_db_fp_(void)
{
CODE_STATE *cs;
get_code_state_or_return NULL;
return cs->stack->out_file;
}
/*
* FUNCTION
*
* _db_keyword_ test keyword for member of keyword list
*
* DESCRIPTION
*
* Test a keyword to determine if it is in the currently active
* keyword list. If strict=0, a keyword is accepted
* if the list is null, otherwise it must match one of the list
* members. When debugging is not on, no keywords are accepted.
* After the maximum trace level is exceeded, no keywords are
* accepted (this behavior subject to change). Additionally,
* the current function and process must be accepted based on
* their respective lists.
*
* Returns TRUE if keyword accepted, FALSE otherwise.
*
*/
BOOLEAN _db_keyword_(CODE_STATE *cs, const char *keyword, int strict)
{
BOOLEAN result;
get_code_state_if_not_set_or_return FALSE;
/* Dirty read, for DBUG_EXECUTE(), DBUG_EXECUTE_IF() ... performance. */
if (! DEBUGGING)
return FALSE;
read_lock_stack(cs);
strict=strict ? INCLUDE : INCLUDE|MATCHED;
result= DoTrace(cs) & DO_TRACE &&
InList(cs->stack->keywords, keyword) & strict;
unlock_stack(cs);
return result;
}
/*
* FUNCTION
*
* Indent indent a line to the given indentation level
*
* SYNOPSIS
*
* static VOID Indent(indent)
* int indent;
*
* DESCRIPTION
*
* Indent a line to the given level. Note that this is
* a simple minded but portable implementation.
* There are better ways.
*
* Also, the indent must be scaled by the compile time option
* of character positions per nesting level.
*
*/
static void Indent(CODE_STATE *cs, int indent)
{
int count;
indent= MAX(indent-1-cs->stack->sub_level,0)*INDENT;
for (count= 0; count < indent ; count++)
{
if ((count % INDENT) == 0)
fputc('|',cs->stack->out_file);
else
fputc(' ',cs->stack->out_file);
}
}
/*
* FUNCTION
*
* FreeList free all memory associated with a linked list
*
* SYNOPSIS
*
* static VOID FreeList(linkp)
* struct link *linkp;
*
* DESCRIPTION
*
* Given pointer to the head of a linked list, frees all
* memory held by the list and the members of the list.
*
*/
static void FreeList(struct link *linkp)
{
struct link *old;
while (linkp != NULL)
{
old= linkp;
linkp= linkp->next_link;
free((void*) old);
}
}
/*
* FUNCTION
*
* DoPrefix print debugger line prefix prior to indentation
*
* SYNOPSIS
*
* static VOID DoPrefix(_line_)
* int _line_;
*
* DESCRIPTION
*
* Print prefix common to all debugger output lines, prior to
* doing indentation if necessary. Print such information as
* current process name, current source file name and line number,
* and current function nesting depth.
*
*/
static void DoPrefix(CODE_STATE *cs, uint _line_)
{
cs->lineno++;
if (cs->stack->flags & PID_ON)
{
(void) fprintf(cs->stack->out_file, "%-7s: ", my_thread_name());
}
if (cs->stack->flags & NUMBER_ON)
(void) fprintf(cs->stack->out_file, "%5d: ", cs->lineno);
if (cs->stack->flags & TIMESTAMP_ON)
{
#ifdef _WIN32
/* FIXME This doesn't give microseconds as in Unix case, and the resolution is
in system ticks, 10 ms intervals. See my_getsystime.c for high res */
SYSTEMTIME loc_t;
GetLocalTime(&loc_t);
(void) fprintf (cs->stack->out_file,
/* "%04d-%02d-%02d " */
"%02d:%02d:%02d.%06d ",
/*tm_p->tm_year + 1900, tm_p->tm_mon + 1, tm_p->tm_mday,*/
loc_t.wHour, loc_t.wMinute, loc_t.wSecond, loc_t.wMilliseconds);
#else
struct timeval tv;
struct tm *tm_p;
if (gettimeofday(&tv, NULL) != -1)
{
if ((tm_p= localtime((const time_t *)&tv.tv_sec)))
{
(void) fprintf (cs->stack->out_file,
/* "%04d-%02d-%02d " */
"%02d:%02d:%02d.%06d ",
/*tm_p->tm_year + 1900, tm_p->tm_mon + 1, tm_p->tm_mday,*/
tm_p->tm_hour, tm_p->tm_min, tm_p->tm_sec,
(int) (tv.tv_usec));
}
}
#endif
}
if (cs->stack->flags & PROCESS_ON)
(void) fprintf(cs->stack->out_file, "%s: ", cs->process);
if (cs->stack->flags & FILE_ON)
(void) fprintf(cs->stack->out_file, "%14s: ", BaseName(cs->file));
if (cs->stack->flags & LINE_ON)
(void) fprintf(cs->stack->out_file, "%5d: ", _line_);
if (cs->stack->flags & DEPTH_ON)
(void) fprintf(cs->stack->out_file, "%4d: ", cs->level);
}
/*
* FUNCTION
*
* DBUGOpenFile open new output stream for debugger output
*
* SYNOPSIS
*
* static VOID DBUGOpenFile(name)
* char *name;
*
* DESCRIPTION
*
* Given name of a new file (or "-" for stdout) opens the file
* and sets the output stream to the new file.
*
*/
static void DBUGOpenFile(CODE_STATE *cs,
const char *name,const char *end,int append)
{
FILE *fp;
if (name != NULL)
{
if (end)
{
size_t len=end-name;
memcpy(cs->stack->name, name, len);
cs->stack->name[len]=0;
}
else
strmov(cs->stack->name,name);
name=cs->stack->name;
if (strcmp(name, "-") == 0)
{
cs->stack->out_file= stdout;
cs->stack->flags |= FLUSH_ON_WRITE;
cs->stack->name[0]=0;
}
else
{
if (!Writable(name))
{
(void) fprintf(stderr, ERR_OPEN, cs->process, name);
perror("");
fflush(stderr);
}
else
{
#ifdef _WIN32
if (fopen_s(&fp, name, append ? "a+" : "w"))
#else
if (!(fp= fopen(name, append ? "a+" : "w")))
#endif
{
(void) fprintf(stderr, ERR_OPEN, cs->process, name);
perror("");
fflush(stderr);
}
else
{
cs->stack->out_file= fp;
}
}
}
}
}
/*
* FUNCTION
*
* DBUGCloseFile close the debug output stream
*
* SYNOPSIS
*
* static VOID DBUGCloseFile(fp)
* FILE *fp;
*
* DESCRIPTION
*
* Closes the debug output stream unless it is standard output
* or standard error.
*
*/
static void DBUGCloseFile(CODE_STATE *cs, FILE *fp)
{
if (fp != NULL && fp != stderr && fp != stdout && fclose(fp) == EOF)
{
pthread_mutex_lock(&THR_LOCK_dbug);
(void) fprintf(cs->stack->out_file, ERR_CLOSE, cs->process);
perror("");
DbugFlush(cs);
}
}
/*
* FUNCTION
*
* DbugExit print error message and exit
*
* SYNOPSIS
*
* static VOID DbugExit(why)
* char *why;
*
* DESCRIPTION
*
* Prints error message using current process name, the reason for
* aborting (typically out of memory), and exits with status 1.
* This should probably be changed to use a status code
* defined in the user's debugger include file.
*
*/
static void DbugExit(const char *why)
{
CODE_STATE *cs=code_state();
(void) fprintf(stderr, ERR_ABORT, cs ? cs->process : "(null)", why);
(void) fflush(stderr);
DBUG_ABORT();
}
/*
* FUNCTION
*
* DbugMalloc allocate memory for debugger runtime support
*
* SYNOPSIS
*
* static long *DbugMalloc(size)
* int size;
*
* DESCRIPTION
*
* Allocate more memory for debugger runtime support functions.
* Failure to to allocate the requested number of bytes is
* immediately fatal to the current process. This may be
* rather unfriendly behavior. It might be better to simply
* print a warning message, freeze the current debugger cs,
* and continue execution.
*
*/
static char *DbugMalloc(size_t size)
{
char *new_malloc;
if (!(new_malloc= (char*) malloc(size)))
DbugExit("out of memory");
return new_malloc;
}
/*
* strtok lookalike - splits on ':', magically handles ::, :\ and :/
*/
static const char *DbugStrTok(const char *s)
{
while (s[0] && (s[0] != ':' ||
(s[1] == '\\' || s[1] == '/' || (s[1] == ':' && s++))))
s++;
return s;
}
/*
* FUNCTION
*
* BaseName strip leading pathname components from name
*
* SYNOPSIS
*
* static char *BaseName(pathname)
* char *pathname;
*
* DESCRIPTION
*
* Given pointer to a complete pathname, locates the base file
* name at the end of the pathname and returns a pointer to
* it.
*
*/
static const char *BaseName(const char *pathname)
{
const char *base;
base= strrchr(pathname, FN_LIBCHAR);
if (base++ == NullS)
base= pathname;
return base;
}
/*
* FUNCTION
*
* Writable test to see if a pathname is writable/creatable
*
* SYNOPSIS
*
* static BOOLEAN Writable(pathname)
* char *pathname;
*
* DESCRIPTION
*
* Because the debugger might be linked in with a program that
* runs with the set-uid-bit (suid) set, we have to be careful
* about opening a user named file for debug output. This consists
* of checking the file for write access with the real user id,
* or checking the directory where the file will be created.
*
* Returns TRUE if the user would normally be allowed write or
* create access to the named file. Returns FALSE otherwise.
*
*/
#ifndef Writable
static BOOLEAN Writable(const char *pathname)
{
BOOLEAN granted;
char *lastslash;
granted= FALSE;
if (EXISTS(pathname))
{
if (WRITABLE(pathname))
granted= TRUE;
}
else
{
lastslash= strrchr(pathname, '/');
if (lastslash != NULL)
*lastslash= '\0';
else
pathname= ".";
if (WRITABLE(pathname))
granted= TRUE;
if (lastslash != NULL)
*lastslash= '/';
}
return granted;
}
#endif
/*
* FUNCTION
*
* _db_setjmp_ save debugger environment
*
* SYNOPSIS
*
* VOID _db_setjmp_()
*
* DESCRIPTION
*
* Invoked as part of the user's DBUG_SETJMP macro to save
* the debugger environment in parallel with saving the user's
* environment.
*
*/
#ifdef HAVE_LONGJMP
EXPORT void _db_setjmp_()
{
CODE_STATE *cs;
get_code_state_or_return;
cs->jmplevel= cs->level;
cs->jmpfunc= cs->func;
cs->jmpfile= cs->file;
}
/*
* FUNCTION
*
* _db_longjmp_ restore previously saved debugger environment
*
* SYNOPSIS
*
* VOID _db_longjmp_()
*
* DESCRIPTION
*
* Invoked as part of the user's DBUG_LONGJMP macro to restore
* the debugger environment in parallel with restoring the user's
* previously saved environment.
*
*/
EXPORT void _db_longjmp_()
{
CODE_STATE *cs;
get_code_state_or_return;
cs->level= cs->jmplevel;
if (cs->jmpfunc)
cs->func= cs->jmpfunc;
if (cs->jmpfile)
cs->file= cs->jmpfile;
}
#endif
/*
* FUNCTION
*
* perror perror simulation for systems that don't have it
*
* SYNOPSIS
*
* static VOID perror(s)
* char *s;
*
* DESCRIPTION
*
* Perror produces a message on the standard error stream which
* provides more information about the library or system error
* just encountered. The argument string s is printed, followed
* by a ':', a blank, and then a message and a newline.
*
* An undocumented feature of the unix perror is that if the string
* 's' is a null string (NOT a NULL pointer!), then the ':' and
* blank are not printed.
*
* This version just complains about an "unknown system error".
*
*/
#ifndef HAVE_PERROR
static void perror(s)
char *s;
{
if (s && *s != '\0')
(void) fprintf(stderr, "%s: ", s);
(void) fprintf(stderr, "<unknown system error>\n");
}
#endif /* HAVE_PERROR */
/* flush dbug-stream, free mutex lock & wait delay */
/* This is because some systems (MSDOS!!) dosn't flush fileheader */
/* and dbug-file isn't readable after a system crash !! */
static void DbugFlush(CODE_STATE *cs)
{
if (cs->stack->flags & FLUSH_ON_WRITE)
{
(void) fflush(cs->stack->out_file);
if (cs->stack->delay)
(void) Delay(cs->stack->delay);
}
if (!cs->locked)
pthread_mutex_unlock(&THR_LOCK_dbug);
} /* DbugFlush */
/* For debugging */
void _db_flush_()
{
CODE_STATE *cs= NULL;
get_code_state_or_return;
(void) fflush(cs->stack->out_file);
}
#ifndef _WIN32
#ifdef HAVE_GCOV
extern void __gcov_flush();
#endif
void _db_flush_gcov_()
{
#ifdef HAVE_GCOV
// Gcov will assert() if we try to flush in parallel.
pthread_mutex_lock(&THR_LOCK_gcov);
__gcov_flush();
pthread_mutex_unlock(&THR_LOCK_gcov);
#endif
}
void _db_suicide_()
{
int retval;
sigset_t new_mask;
sigfillset(&new_mask);
#ifdef HAVE_GCOV
fprintf(stderr, "Flushing gcov data\n");
fflush(stderr);
_db_flush_gcov_();
#endif
fprintf(stderr, "SIGKILL myself\n");
fflush(stderr);
retval= kill(getpid(), SIGKILL);
assert(retval == 0);
retval= sigsuspend(&new_mask);
fprintf(stderr, "sigsuspend returned %d errno %d \n", retval, errno);
assert(FALSE); /* With full signal mask, we should never return here. */
}
#endif /* ! _WIN32 */
void _db_lock_file_()
{
CODE_STATE *cs;
get_code_state_or_return;
pthread_mutex_lock(&THR_LOCK_dbug);
cs->locked=1;
}
void _db_unlock_file_()
{
CODE_STATE *cs;
get_code_state_or_return;
cs->locked=0;
pthread_mutex_unlock(&THR_LOCK_dbug);
}
const char* _db_get_func_(void)
{
CODE_STATE *cs;
get_code_state_or_return NULL;
return cs->func;
}
#else
/*
* Dummy function, workaround for MySQL bug#14420 related
* build failure on a platform where linking with an empty
* archive fails.
*
* This block can be removed as soon as a fix for bug#14420
* is implemented.
*/
int i_am_a_dummy_function() {
return 0;
}
#endif
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