shareSQL/dbug/dbug.c at master · FlashSQL/shareSQL · GitHub

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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.)

#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(__WIN__)

#include <process.h>

#endif

#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 */

#define AUTO auto /* Names to be allocated on stack */

#define REGISTER register /* Names to be placed in registers */

* 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);

/* Change file owner and group */

static void ChangeOwner(CODE_STATE *cs, char *pathname);

/* Allocate memory for runtime support */

#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);

static void DbugVfprintf(FILE *stream, const char* format, va_list args);

* 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;

/**

Lock, to protect @c init_settings.

For performance reasons,

the member @c init_settings.flags is not protected.

static rw_lock_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);

my_rwlock_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)

rw_rdlock(&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)

rw_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)

rw_wrlock(&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);

rw_rdlock(&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);

rw_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);

/* Turn off DEBUG_ON if it is last keyword to be removed. */

if (stack->keywords == NULL)

stack->flags&= ~DEBUG_ON;

}

break;

}

/* Do not add keyword if debugging all is enabled. */

if (!(DEBUGGING && stack->keywords == NULL))

{

stack->keywords= ListAdd(stack->keywords, control, end);

stack->flags|= DEBUG_ON;

}

/* If debug all is enabled, make the keyword list empty. */

if (sign == 1 && control == end)

{

FreeList(stack->keywords);

stack->keywords= NULL;

}

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)

rw_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

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shareSQL/dbug/dbug.c at master · FlashSQL/shareSQL · GitHub

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