/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2000-2010. All Rights Reserved.
*
* The contents of this file are subject to the Erlang Public License,
* Version 1.1, (the "License"); you may not use this file except in
* compliance with the License. You should have received a copy of the
* Erlang Public License along with this software. If not, it can be
* retrieved online at http://www.erlang.org/.
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* %CopyrightEnd%
*/
#ifndef _BEAM_BP_H
#define _BEAM_BP_H
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
/*
** Common struct to all bp_data_*
**
** Two gotchas:
**
** 1) The type of bp_data structure in the ring is deduced from the
** orig_instr field of the structure _before_ in the ring, except for
** the first structure in the ring that has its instruction in
** pc[0] of the code to execute.
**
** 2) pc[-4] points to the _last_ structure in the ring before the
** breakpoints are being executed.
**
** So, as an example, when a breakpointed function starts to execute,
** the first instruction that is a breakpoint instruction at pc[0] finds
** its data at ((BpData *) pc[-4])->next and has to cast that pointer
** to the correct bp_data type.
*/
typedef struct bp_data {
struct bp_data *next; /* Doubly linked ring pointers */
struct bp_data *prev; /* -"- */
BeamInstr orig_instr; /* The original instruction to execute */
} BpData;
/*
** All the following bp_data_.. structs must begin the same way
*/
typedef struct bp_data_trace {
struct bp_data *next;
struct bp_data *prev;
BeamInstr orig_instr;
Binary *match_spec;
Eterm tracer_pid;
} BpDataTrace;
typedef struct bp_data_debug {
struct bp_data *next;
struct bp_data *prev;
BeamInstr orig_instr;
} BpDataDebug;
typedef struct bp_data_count { /* Call count */
struct bp_data *next;
struct bp_data *prev;
BeamInstr orig_instr;
Sint count;
} BpDataCount;
extern erts_smp_spinlock_t erts_bp_lock;
#ifdef ERTS_SMP
#define ErtsSmpBPLock(BDC) erts_smp_spin_lock(&erts_bp_lock)
#define ErtsSmpBPUnlock(BDC) erts_smp_spin_unlock(&erts_bp_lock)
#else
#define ErtsSmpBPLock(BDC)
#define ErtsSmpBPUnlock(BDC)
#endif
#define ErtsCountBreak(pc,instr_result) \
do { \
BpDataCount *bdc = (BpDataCount *) (pc)[-4]; \
\
ASSERT((pc)[-5] == (BeamInstr) BeamOp(op_i_func_info_IaaI)); \
ASSERT(bdc); \
bdc = (BpDataCount *) bdc->next; \
ASSERT(bdc); \
(pc)[-4] = (BeamInstr) bdc; \
ErtsSmpBPLock(bdc); \
if (bdc->count >= 0) bdc->count++; \
ErtsSmpBPUnlock(bdc); \
*(instr_result) = bdc->orig_instr; \
} while (0)
#define ErtsBreakSkip(pc,instr_result) \
do { \
BpData *bd = (BpData *) (pc)[-4]; \
\
ASSERT((pc)[-5] == (BeamInstr) BeamOp(op_i_func_info_IaaI)); \
ASSERT(bd); \
bd = bd->next; \
ASSERT(bd); \
(pc)[-4] = (BeamInstr) bd; \
*(instr_result) = bd->orig_instr; \
} while (0)
enum erts_break_op{
erts_break_nop = 0, /* Must be false */
erts_break_set = !0, /* Must be true */
erts_break_reset,
erts_break_stop
};
/*
** Function interface exported from beam_bp.c
*/
void erts_bp_init(void);
int erts_set_trace_break(Eterm mfa[3], int specified, Binary *match_spec,
Eterm tracer_pid);
int erts_clear_trace_break(Eterm mfa[3], int specified);
int erts_set_mtrace_break(Eterm mfa[3], int specified, Binary *match_spec,
Eterm tracer_pid);
int erts_clear_mtrace_break(Eterm mfa[3], int specified);
void erts_set_mtrace_bif(BeamInstr *pc, Binary *match_spec,
Eterm tracer_pid);
void erts_clear_mtrace_bif(BeamInstr *pc);
int erts_set_debug_break(Eterm mfa[3], int specified);
int erts_clear_debug_break(Eterm mfa[3], int specified);
int erts_set_count_break(Eterm mfa[3], int specified, enum erts_break_op);
int erts_clear_count_break(Eterm mfa[3], int specified);
int erts_clear_break(Eterm mfa[3], int specified);
int erts_clear_module_break(Module *modp);
int erts_clear_function_break(Module *modp, BeamInstr *pc);
BeamInstr erts_trace_break(Process *p, BeamInstr *pc, Eterm *args,
Uint32 *ret_flags, Eterm *tracer_pid);
Uint32 erts_bif_mtrace(Process *p, BeamInstr *pc, Eterm *args,
int local, Eterm *tracer_pid);
int erts_is_trace_break(BeamInstr *pc, Binary **match_spec_ret,
Eterm *tracer_pid_ret);
int erts_is_mtrace_break(BeamInstr *pc, Binary **match_spec_ret,
Eterm *tracer_pid_rte);
int erts_is_mtrace_bif(BeamInstr *pc, Binary **match_spec_ret,
Eterm *tracer_pid_ret);
int erts_is_native_break(BeamInstr *pc);
int erts_is_count_break(BeamInstr *pc, Sint *count_ret);
BeamInstr *erts_find_local_func(Eterm mfa[3]);
#endif /* _BEAM_BP_H */
