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beam_emu.c
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beam_emu.c
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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1996-2018. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stddef.h> /* offsetof() */
#include "sys.h"
#include "erl_vm.h"
#include "global.h"
#include "erl_process.h"
#include "error.h"
#include "bif.h"
#include "big.h"
#include "beam_load.h"
#include "erl_binary.h"
#include "erl_map.h"
#include "erl_bits.h"
#include "dist.h"
#include "beam_bp.h"
#include "beam_catches.h"
#include "erl_thr_progress.h"
#include "erl_nfunc_sched.h"
#ifdef HIPE
#include "hipe_mode_switch.h"
#include "hipe_bif1.h"
#endif
#include "dtrace-wrapper.h"
#include "erl_proc_sig_queue.h"
/* #define HARDDEBUG 1 */
#if defined(NO_JUMP_TABLE)
# define OpCase(OpCode) case op_##OpCode
# define CountCase(OpCode) case op_count_##OpCode
# define IsOpCode(InstrWord, OpCode) (BeamCodeAddr(InstrWord) == (BeamInstr)op_##OpCode)
# define Goto(Rel) {Go = BeamCodeAddr(Rel); goto emulator_loop;}
# define GotoPF(Rel) Goto(Rel)
#else
# define OpCase(OpCode) lb_##OpCode
# define CountCase(OpCode) lb_count_##OpCode
# define IsOpCode(InstrWord, OpCode) (BeamCodeAddr(InstrWord) == (BeamInstr)&&lb_##OpCode)
# define Goto(Rel) goto *((void *)BeamCodeAddr(Rel))
# define GotoPF(Rel) goto *((void *)Rel)
# define LabelAddr(Label) &&Label
#endif
#ifdef ERTS_ENABLE_LOCK_CHECK
# define PROCESS_MAIN_CHK_LOCKS(P) \
do { \
if ((P)) \
erts_proc_lc_chk_only_proc_main((P)); \
ERTS_LC_ASSERT(!erts_thr_progress_is_blocking()); \
} while (0)
# define ERTS_REQ_PROC_MAIN_LOCK(P) \
do { \
if ((P)) \
erts_proc_lc_require_lock((P), ERTS_PROC_LOCK_MAIN, \
__FILE__, __LINE__); \
} while (0)
# define ERTS_UNREQ_PROC_MAIN_LOCK(P) \
do { \
if ((P)) \
erts_proc_lc_unrequire_lock((P), ERTS_PROC_LOCK_MAIN); \
} while (0)
#else
# define PROCESS_MAIN_CHK_LOCKS(P)
# define ERTS_REQ_PROC_MAIN_LOCK(P)
# define ERTS_UNREQ_PROC_MAIN_LOCK(P)
#endif
/*
* Define macros for deep checking of terms.
*/
#if defined(HARDDEBUG)
# define CHECK_TERM(T) size_object(T)
# define CHECK_ARGS(PC) \
do { \
int i_; \
int Arity_ = PC[-1]; \
for (i_ = 0; i_ < Arity_; i_++) { \
CHECK_TERM(x(i_)); \
} \
} while (0)
#else
# define CHECK_TERM(T) ASSERT(!is_CP(T))
# define CHECK_ARGS(T)
#endif
#define CHECK_ALIGNED(Dst) ASSERT((((Uint)&Dst) & (sizeof(Uint)-1)) == 0)
#define GET_BIF_MODULE(p) (p->info.mfa.module)
#define GET_BIF_FUNCTION(p) (p->info.mfa.function)
#define GET_BIF_ARITY(p) (p->info.mfa.arity)
#define GET_BIF_ADDRESS(p) ((BifFunction) (p->beam[1]))
#define TermWords(t) (((t) / (sizeof(BeamInstr)/sizeof(Eterm))) + !!((t) % (sizeof(BeamInstr)/sizeof(Eterm))))
/*
* We reuse some of fields in the save area in the process structure.
* This is safe to do, since this space is only actively used when
* the process is switched out.
*/
#define REDS_IN(p) ((p)->def_arg_reg[5])
/*
* Add a byte offset to a pointer to Eterm. This is useful when the
* the loader has precalculated a byte offset.
*/
#define ADD_BYTE_OFFSET(ptr, offset) \
((Eterm *) (((unsigned char *)ptr) + (offset)))
/* We don't check the range if an ordinary switch is used */
#ifdef NO_JUMP_TABLE
# define VALID_INSTR(IP) (BeamCodeAddr(IP) < (NUMBER_OF_OPCODES*2+10))
#else
# define VALID_INSTR(IP) \
((BeamInstr)LabelAddr(emulator_loop) <= BeamCodeAddr(IP) && \
BeamCodeAddr(IP) < (BeamInstr)LabelAddr(end_emulator_loop))
#endif /* NO_JUMP_TABLE */
#define SET_CP(p, ip) \
ASSERT(VALID_INSTR(*(ip))); \
(p)->cp = (ip)
#define SET_I(ip) \
ASSERT(VALID_INSTR(* (Eterm *)(ip))); \
I = (ip)
/*
* Register target (X or Y register).
*/
#define REG_TARGET_PTR(Target) (((Target) & 1) ? &yb((Target)-1) : &xb(Target))
/*
* Special Beam instructions.
*/
BeamInstr beam_apply[2];
BeamInstr beam_exit[1];
BeamInstr beam_continue_exit[1];
/* NOTE These should be the only variables containing trace instructions.
** Sometimes tests are form the instruction value, and sometimes
** for the referring variable (one of these), and rouge references
** will most likely cause chaos.
*/
BeamInstr beam_return_to_trace[1]; /* OpCode(i_return_to_trace) */
BeamInstr beam_return_trace[1]; /* OpCode(i_return_trace) */
BeamInstr beam_exception_trace[1]; /* UGLY also OpCode(i_return_trace) */
BeamInstr beam_return_time_trace[1]; /* OpCode(i_return_time_trace) */
/*
* All Beam instructions in numerical order.
*/
#ifndef NO_JUMP_TABLE
void** beam_ops;
#endif
#define SWAPIN \
HTOP = HEAP_TOP(c_p); \
E = c_p->stop
#define SWAPOUT \
HEAP_TOP(c_p) = HTOP; \
c_p->stop = E
#define HEAVY_SWAPIN \
SWAPIN; \
FCALLS = c_p->fcalls
#define HEAVY_SWAPOUT \
SWAPOUT; \
c_p->fcalls = FCALLS
/*
* Use LIGHT_SWAPOUT when the called function
* will call HeapOnlyAlloc() (and never HAlloc()).
*/
#ifdef DEBUG
# /* The stack pointer is used in an assertion. */
# define LIGHT_SWAPOUT SWAPOUT
# define DEBUG_SWAPOUT SWAPOUT
# define DEBUG_SWAPIN SWAPIN
#else
# define LIGHT_SWAPOUT HEAP_TOP(c_p) = HTOP
# define DEBUG_SWAPOUT
# define DEBUG_SWAPIN
#endif
/*
* Use LIGHT_SWAPIN when we know that c_p->stop cannot
* have been updated (i.e. if there cannot have been
* a garbage-collection).
*/
#define LIGHT_SWAPIN HTOP = HEAP_TOP(c_p)
#ifdef FORCE_HEAP_FRAGS
# define HEAP_SPACE_VERIFIED(Words) do { \
c_p->space_verified = (Words); \
c_p->space_verified_from = HTOP; \
}while(0)
#else
# define HEAP_SPACE_VERIFIED(Words) ((void)0)
#endif
#define PRE_BIF_SWAPOUT(P) \
HEAP_TOP((P)) = HTOP; \
(P)->stop = E; \
PROCESS_MAIN_CHK_LOCKS((P)); \
ERTS_UNREQ_PROC_MAIN_LOCK((P))
#define db(N) (N)
#define fb(N) ((Sint)(Sint32)(N))
#define jb(N) ((Sint)(Sint32)(N))
#define tb(N) (N)
#define xb(N) (*ADD_BYTE_OFFSET(reg, N))
#define yb(N) (*ADD_BYTE_OFFSET(E, N))
#define Sb(N) (*REG_TARGET_PTR(N))
#define lb(N) (*(double *) (((unsigned char *)&(freg[0].fd)) + (N)))
#define Qb(N) (N)
#define Ib(N) (N)
#define x(N) reg[N]
#define y(N) E[N]
#define r(N) x(N)
#define Q(N) (N*sizeof(Eterm *))
#define l(N) (freg[N].fd)
/*
* Check that we haven't used the reductions and jump to function pointed to by
* the I register. If we are out of reductions, do a context switch.
*/
#define DispatchMacro() \
do { \
BeamInstr dis_next; \
dis_next = *I; \
CHECK_ARGS(I); \
if (FCALLS > 0 || FCALLS > neg_o_reds) { \
FCALLS--; \
Goto(dis_next); \
} else { \
goto context_switch; \
} \
} while (0) \
#define DispatchMacroFun() \
do { \
BeamInstr dis_next; \
dis_next = *I; \
CHECK_ARGS(I); \
if (FCALLS > 0 || FCALLS > neg_o_reds) { \
FCALLS--; \
Goto(dis_next); \
} else { \
goto context_switch_fun; \
} \
} while (0)
#define DispatchMacrox() \
do { \
if (FCALLS > 0) { \
BeamInstr dis_next; \
SET_I(((Export *) Arg(0))->addressv[erts_active_code_ix()]); \
dis_next = *I; \
FCALLS--; \
CHECK_ARGS(I); \
Goto(dis_next); \
} else if (ERTS_PROC_GET_SAVED_CALLS_BUF(c_p) \
&& FCALLS > neg_o_reds) { \
goto save_calls1; \
} else { \
SET_I(((Export *) Arg(0))->addressv[erts_active_code_ix()]); \
CHECK_ARGS(I); \
goto context_switch; \
} \
} while (0)
#ifdef DEBUG
/*
* To simplify breakpoint setting, put the code in one place only and jump to it.
*/
# define Dispatch() goto do_dispatch
# define Dispatchx() goto do_dispatchx
# define Dispatchfun() goto do_dispatchfun
#else
/*
* Inline for speed.
*/
# define Dispatch() DispatchMacro()
# define Dispatchx() DispatchMacrox()
# define Dispatchfun() DispatchMacroFun()
#endif
#define Arg(N) I[(N)+1]
#define GetR(pos, tr) \
do { \
tr = Arg(pos); \
switch (loader_tag(tr)) { \
case LOADER_X_REG: \
tr = x(loader_x_reg_index(tr)); \
break; \
case LOADER_Y_REG: \
ASSERT(loader_y_reg_index(tr) >= 1); \
tr = y(loader_y_reg_index(tr)); \
break; \
} \
CHECK_TERM(tr); \
} while (0)
#define PUT_TERM_REG(term, desc) \
do { \
switch (loader_tag(desc)) { \
case LOADER_X_REG: \
x(loader_x_reg_index(desc)) = (term); \
break; \
case LOADER_Y_REG: \
y(loader_y_reg_index(desc)) = (term); \
break; \
default: \
ASSERT(0); \
break; \
} \
} while(0)
#define DispatchReturn \
do { \
if (FCALLS > 0 || FCALLS > neg_o_reds) { \
FCALLS--; \
Goto(*I); \
} \
else { \
c_p->current = NULL; \
c_p->arity = 1; \
goto context_switch3; \
} \
} while (0)
#ifdef DEBUG
/* Better static type testing by the C compiler */
# define BEAM_IS_TUPLE(Src) is_tuple(Src)
#else
/* Better performance */
# define BEAM_IS_TUPLE(Src) is_boxed(Src)
#endif
/*
* process_main() is already huge, so we want to avoid inlining
* into it. Especially functions that are seldom used.
*/
#ifdef __GNUC__
# define NOINLINE __attribute__((__noinline__))
#else
# define NOINLINE
#endif
/*
* The following functions are called directly by process_main().
* Don't inline them.
*/
static void init_emulator_finish(void) NOINLINE;
static ErtsCodeMFA *ubif2mfa(void* uf) NOINLINE;
static BeamInstr* handle_error(Process* c_p, BeamInstr* pc,
Eterm* reg, ErtsCodeMFA* bif_mfa) NOINLINE;
static BeamInstr* call_error_handler(Process* p, ErtsCodeMFA* mfa,
Eterm* reg, Eterm func) NOINLINE;
static BeamInstr* fixed_apply(Process* p, Eterm* reg, Uint arity,
BeamInstr *I, Uint offs) NOINLINE;
static BeamInstr* apply(Process* p, Eterm* reg,
BeamInstr *I, Uint offs) NOINLINE;
static BeamInstr* call_fun(Process* p, int arity,
Eterm* reg, Eterm args) NOINLINE;
static BeamInstr* apply_fun(Process* p, Eterm fun,
Eterm args, Eterm* reg) NOINLINE;
static Eterm new_fun(Process* p, Eterm* reg,
ErlFunEntry* fe, int num_free) NOINLINE;
static int is_function2(Eterm Term, Uint arity);
static Eterm erts_gc_new_map(Process* p, Eterm* reg, Uint live,
Uint n, BeamInstr* ptr) NOINLINE;
static Eterm erts_gc_new_small_map_lit(Process* p, Eterm* reg, Eterm keys_literal,
Uint live, BeamInstr* ptr) NOINLINE;
static Eterm erts_gc_update_map_assoc(Process* p, Eterm* reg, Uint live,
Uint n, BeamInstr* new_p) NOINLINE;
static Eterm erts_gc_update_map_exact(Process* p, Eterm* reg, Uint live,
Uint n, Eterm* new_p) NOINLINE;
static Eterm get_map_element(Eterm map, Eterm key);
static Eterm get_map_element_hash(Eterm map, Eterm key, Uint32 hx);
/*
* Functions not directly called by process_main(). OK to inline.
*/
static BeamInstr* next_catch(Process* c_p, Eterm *reg);
static void terminate_proc(Process* c_p, Eterm Value);
static Eterm add_stacktrace(Process* c_p, Eterm Value, Eterm exc);
static void save_stacktrace(Process* c_p, BeamInstr* pc, Eterm* reg,
ErtsCodeMFA *bif_mfa, Eterm args);
static struct StackTrace * get_trace_from_exc(Eterm exc);
static Eterm make_arglist(Process* c_p, Eterm* reg, int a);
void
init_emulator(void)
{
process_main(0, 0);
}
/*
* On certain platforms, make sure that the main variables really are placed
* in registers.
*/
#if defined(__GNUC__) && defined(sparc) && !defined(DEBUG)
# define REG_xregs asm("%l1")
# define REG_htop asm("%l2")
# define REG_stop asm("%l3")
# define REG_I asm("%l4")
# define REG_fcalls asm("%l5")
#elif defined(__GNUC__) && defined(__amd64__) && !defined(DEBUG)
# define REG_xregs asm("%r12")
# define REG_htop
# define REG_stop asm("%r13")
# define REG_I asm("%rbx")
# define REG_fcalls asm("%r14")
#else
# define REG_xregs
# define REG_htop
# define REG_stop
# define REG_I
# define REG_fcalls
#endif
#ifdef USE_VM_PROBES
# define USE_VM_CALL_PROBES
#endif
#ifdef USE_VM_CALL_PROBES
#define DTRACE_LOCAL_CALL(p, mfa) \
if (DTRACE_ENABLED(local_function_entry)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
int depth = STACK_START(p) - STACK_TOP(p); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE3(local_function_entry, process_name, mfa_buf, depth); \
}
#define DTRACE_GLOBAL_CALL(p, mfa) \
if (DTRACE_ENABLED(global_function_entry)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
int depth = STACK_START(p) - STACK_TOP(p); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE3(global_function_entry, process_name, mfa_buf, depth); \
}
#define DTRACE_RETURN(p, mfa) \
if (DTRACE_ENABLED(function_return)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
int depth = STACK_START(p) - STACK_TOP(p); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE3(function_return, process_name, mfa_buf, depth); \
}
#define DTRACE_BIF_ENTRY(p, mfa) \
if (DTRACE_ENABLED(bif_entry)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE2(bif_entry, process_name, mfa_buf); \
}
#define DTRACE_BIF_RETURN(p, mfa) \
if (DTRACE_ENABLED(bif_return)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE2(bif_return, process_name, mfa_buf); \
}
#define DTRACE_NIF_ENTRY(p, mfa) \
if (DTRACE_ENABLED(nif_entry)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE2(nif_entry, process_name, mfa_buf); \
}
#define DTRACE_NIF_RETURN(p, mfa) \
if (DTRACE_ENABLED(nif_return)) { \
DTRACE_CHARBUF(process_name, DTRACE_TERM_BUF_SIZE); \
DTRACE_CHARBUF(mfa_buf, DTRACE_TERM_BUF_SIZE); \
dtrace_fun_decode(p, mfa, process_name, mfa_buf); \
DTRACE2(nif_return, process_name, mfa_buf); \
}
#define DTRACE_GLOBAL_CALL_FROM_EXPORT(p,e) \
do { \
if (DTRACE_ENABLED(global_function_entry)) { \
BeamInstr* fp = (BeamInstr *) (((Export *) (e))->addressv[erts_active_code_ix()]); \
DTRACE_GLOBAL_CALL((p), erts_code_to_codemfa(fp)); \
} \
} while(0)
#define DTRACE_RETURN_FROM_PC(p) \
do { \
ErtsCodeMFA* cmfa; \
if (DTRACE_ENABLED(function_return) && (cmfa = find_function_from_pc((p)->cp))) { \
DTRACE_RETURN((p), cmfa); \
} \
} while(0)
#else /* USE_VM_PROBES */
#define DTRACE_LOCAL_CALL(p, mfa) do {} while (0)
#define DTRACE_GLOBAL_CALL(p, mfa) do {} while (0)
#define DTRACE_GLOBAL_CALL_FROM_EXPORT(p, e) do {} while (0)
#define DTRACE_RETURN(p, mfa) do {} while (0)
#define DTRACE_RETURN_FROM_PC(p) do {} while (0)
#define DTRACE_BIF_ENTRY(p, mfa) do {} while (0)
#define DTRACE_BIF_RETURN(p, mfa) do {} while (0)
#define DTRACE_NIF_ENTRY(p, mfa) do {} while (0)
#define DTRACE_NIF_RETURN(p, mfa) do {} while (0)
#endif /* USE_VM_PROBES */
#ifdef DEBUG
#define ERTS_DBG_CHK_REDS(P, FC) \
do { \
if (ERTS_PROC_GET_SAVED_CALLS_BUF((P))) { \
ASSERT(FC <= 0); \
ASSERT(erts_proc_sched_data(c_p)->virtual_reds \
<= 0 - (FC)); \
} \
else { \
ASSERT(FC <= CONTEXT_REDS); \
ASSERT(erts_proc_sched_data(c_p)->virtual_reds \
<= CONTEXT_REDS - (FC)); \
} \
} while (0)
#else
#define ERTS_DBG_CHK_REDS(P, FC)
#endif
#ifdef NO_FPE_SIGNALS
# define ERTS_NO_FPE_CHECK_INIT ERTS_FP_CHECK_INIT
# define ERTS_NO_FPE_ERROR ERTS_FP_ERROR
#else
# define ERTS_NO_FPE_CHECK_INIT(p)
# define ERTS_NO_FPE_ERROR(p, a, b)
#endif
/*
* process_main() is called twice:
* The first call performs some initialisation, including exporting
* the instructions' C labels to the loader.
* The second call starts execution of BEAM code. This call never returns.
*/
ERTS_NO_RETPOLINE
void process_main(Eterm * x_reg_array, FloatDef* f_reg_array)
{
static int init_done = 0;
Process* c_p = NULL;
int reds_used;
#ifdef DEBUG
ERTS_DECLARE_DUMMY(Eterm pid);
#endif
/* Pointer to X registers: x(1)..x(N); reg[0] is used when doing GC,
* in all other cases x0 is used.
*/
register Eterm* reg REG_xregs = x_reg_array;
/*
* Top of heap (next free location); grows upwards.
*/
register Eterm* HTOP REG_htop = NULL;
/* Stack pointer. Grows downwards; points
* to last item pushed (normally a saved
* continuation pointer).
*/
register Eterm* E REG_stop = NULL;
/*
* Pointer to next threaded instruction.
*/
register BeamInstr *I REG_I = NULL;
/* Number of reductions left. This function
* returns to the scheduler when FCALLS reaches zero.
*/
register Sint FCALLS REG_fcalls = 0;
/*
* X registers and floating point registers are located in
* scheduler specific data.
*/
register FloatDef *freg = f_reg_array;
/*
* For keeping the negative old value of 'reds' when call saving is active.
*/
int neg_o_reds = 0;
#ifdef ERTS_OPCODE_COUNTER_SUPPORT
static void* counting_opcodes[] = { DEFINE_COUNTING_OPCODES };
#else
#ifndef NO_JUMP_TABLE
static void* opcodes[] = { DEFINE_OPCODES };
#else
register BeamInstr Go;
#endif
#endif
Uint64 start_time = 0; /* Monitor long schedule */
BeamInstr* start_time_i = NULL;
ERTS_MSACC_DECLARE_CACHE_X() /* a cached value of the tsd pointer for msacc */
ERL_BITS_DECLARE_STATEP; /* Has to be last declaration */
/*
* Note: In this function, we attempt to place rarely executed code towards
* the end of the function, in the hope that the cache hit rate will be better.
* The initialization code is only run once, so it is at the very end.
*
* Note: c_p->arity must be set to reflect the number of useful terms in
* c_p->arg_reg before calling the scheduler.
*/
if (ERTS_UNLIKELY(!init_done)) {
/* This should only be reached during the init phase when only the main
* process is running. I.e. there is no race for init_done.
*/
init_done = 1;
goto init_emulator;
}
c_p = NULL;
reds_used = 0;
goto do_schedule1;
do_schedule:
ASSERT(c_p->arity < 6);
ASSERT(c_p->debug_reds_in == REDS_IN(c_p));
if (!ERTS_PROC_GET_SAVED_CALLS_BUF(c_p))
reds_used = REDS_IN(c_p) - FCALLS;
else
reds_used = REDS_IN(c_p) - (CONTEXT_REDS + FCALLS);
ASSERT(reds_used >= 0);
do_schedule1:
if (start_time != 0) {
Sint64 diff = erts_timestamp_millis() - start_time;
if (diff > 0 && (Uint) diff > erts_system_monitor_long_schedule) {
ErtsCodeMFA *inptr = find_function_from_pc(start_time_i);
ErtsCodeMFA *outptr = find_function_from_pc(c_p->i);
monitor_long_schedule_proc(c_p,inptr,outptr,(Uint) diff);
}
}
PROCESS_MAIN_CHK_LOCKS(c_p);
ERTS_UNREQ_PROC_MAIN_LOCK(c_p);
ERTS_VERIFY_UNUSED_TEMP_ALLOC(c_p);
c_p = erts_schedule(NULL, c_p, reds_used);
ASSERT(!(c_p->flags & F_HIPE_MODE));
ERTS_VERIFY_UNUSED_TEMP_ALLOC(c_p);
start_time = 0;
#ifdef DEBUG
pid = c_p->common.id; /* Save for debugging purposes */
#endif
ERTS_REQ_PROC_MAIN_LOCK(c_p);
PROCESS_MAIN_CHK_LOCKS(c_p);
ERTS_MSACC_UPDATE_CACHE_X();
if (erts_system_monitor_long_schedule != 0) {
start_time = erts_timestamp_millis();
start_time_i = c_p->i;
}
ERL_BITS_RELOAD_STATEP(c_p);
{
int reds;
Eterm* argp;
BeamInstr next;
int i;
argp = c_p->arg_reg;
for (i = c_p->arity - 1; i >= 0; i--) {
reg[i] = argp[i];
CHECK_TERM(reg[i]);
}
/*
* We put the original reduction count in the process structure, to reduce
* the code size (referencing a field in a struct through a pointer stored
* in a register gives smaller code than referencing a global variable).
*/
SET_I(c_p->i);
REDS_IN(c_p) = reds = c_p->fcalls;
#ifdef DEBUG
c_p->debug_reds_in = reds;
#endif
if (ERTS_PROC_GET_SAVED_CALLS_BUF(c_p)) {
neg_o_reds = -CONTEXT_REDS;
FCALLS = neg_o_reds + reds;
} else {
neg_o_reds = 0;
FCALLS = reds;
}
ERTS_DBG_CHK_REDS(c_p, FCALLS);
next = *I;
SWAPIN;
ASSERT(VALID_INSTR(next));
#ifdef USE_VM_PROBES
if (DTRACE_ENABLED(process_scheduled)) {
DTRACE_CHARBUF(process_buf, DTRACE_TERM_BUF_SIZE);
DTRACE_CHARBUF(fun_buf, DTRACE_TERM_BUF_SIZE);
dtrace_proc_str(c_p, process_buf);
if (ERTS_PROC_IS_EXITING(c_p)) {
sys_strcpy(fun_buf, "<exiting>");
} else {
ErtsCodeMFA *cmfa = find_function_from_pc(c_p->i);
if (cmfa) {
dtrace_fun_decode(c_p, cmfa,
NULL, fun_buf);
} else {
erts_snprintf(fun_buf, sizeof(DTRACE_CHARBUF_NAME(fun_buf)),
"<unknown/%p>", next);
}
}
DTRACE2(process_scheduled, process_buf, fun_buf);
}
#endif
Goto(next);
}
#if defined(DEBUG) || defined(NO_JUMP_TABLE)
emulator_loop:
#endif
#ifdef NO_JUMP_TABLE
switch (Go) {
#endif
#include "beam_hot.h"
#ifdef DEBUG
/*
* Set a breakpoint here to get control just after a call instruction.
* I points to the first instruction in the called function.
*
* In gdb, use 'call dis(I-5, 1)' to show the name of the function.
*/
do_dispatch:
DispatchMacro();
do_dispatchx:
DispatchMacrox();
do_dispatchfun:
DispatchMacroFun();
#endif
/*
* Jumped to from the Dispatch() macro when the reductions are used up.
*
* Since the I register points just beyond the FuncBegin instruction, we
* can get the module, function, and arity for the function being
* called from I[-3], I[-2], and I[-1] respectively.
*/
context_switch_fun:
/* Add one for the environment of the fun */
c_p->arity = erts_code_to_codemfa(I)->arity + 1;
goto context_switch2;
context_switch:
c_p->arity = erts_code_to_codemfa(I)->arity;
context_switch2: /* Entry for fun calls. */
c_p->current = erts_code_to_codemfa(I);
context_switch3:
{
Eterm* argp;
int i;
if (erts_atomic32_read_nob(&c_p->state) & ERTS_PSFLG_EXITING) {
c_p->i = beam_exit;
c_p->arity = 0;
c_p->current = NULL;
goto do_schedule;
}
/*
* Make sure that there is enough room for the argument registers to be saved.
*/
if (c_p->arity > c_p->max_arg_reg) {
/*
* Yes, this is an expensive operation, but you only pay it the first
* time you call a function with more than 6 arguments which is
* scheduled out. This is better than paying for 26 words of wasted
* space for most processes which never call functions with more than
* 6 arguments.
*/
Uint size = c_p->arity * sizeof(c_p->arg_reg[0]);
if (c_p->arg_reg != c_p->def_arg_reg) {
c_p->arg_reg = (Eterm *) erts_realloc(ERTS_ALC_T_ARG_REG,
(void *) c_p->arg_reg,
size);
} else {
c_p->arg_reg = (Eterm *) erts_alloc(ERTS_ALC_T_ARG_REG, size);
}
c_p->max_arg_reg = c_p->arity;
}
/*
* Since REDS_IN(c_p) is stored in the save area (c_p->arg_reg) we must read it
* now before saving registers.
*
* The '+ 1' compensates for the last increment which was not done
* (beacuse the code for the Dispatch() macro becomes shorter that way).
*/
ASSERT(c_p->debug_reds_in == REDS_IN(c_p));
if (!ERTS_PROC_GET_SAVED_CALLS_BUF(c_p))
reds_used = REDS_IN(c_p) - FCALLS;
else
reds_used = REDS_IN(c_p) - (CONTEXT_REDS + FCALLS);
ASSERT(reds_used >= 0);
/*
* Save the argument registers and everything else.
*/
argp = c_p->arg_reg;
for (i = c_p->arity - 1; i >= 0; i--) {
argp[i] = reg[i];
}
SWAPOUT;
c_p->i = I;
goto do_schedule1;
}
#include "beam_warm.h"
OpCase(normal_exit): {
SWAPOUT;
c_p->freason = EXC_NORMAL;
c_p->arity = 0; /* In case this process will ever be garbed again. */
ERTS_UNREQ_PROC_MAIN_LOCK(c_p);
erts_do_exit_process(c_p, am_normal);
ERTS_REQ_PROC_MAIN_LOCK(c_p);
goto do_schedule;
}
OpCase(continue_exit): {
ERTS_UNREQ_PROC_MAIN_LOCK(c_p);
erts_continue_exit_process(c_p);
ERTS_REQ_PROC_MAIN_LOCK(c_p);
goto do_schedule;
}
find_func_info: {
SWAPOUT;
I = handle_error(c_p, I, reg, NULL);
goto post_error_handling;
}
OpCase(call_error_handler):
/*
* At this point, I points to the code[3] in the export entry for
* a function which is not loaded.
*
* code[0]: Module
* code[1]: Function
* code[2]: Arity
* code[3]: &&call_error_handler
* code[4]: Not used
*/
HEAVY_SWAPOUT;
I = call_error_handler(c_p, erts_code_to_codemfa(I),
reg, am_undefined_function);
HEAVY_SWAPIN;
if (I) {
Goto(*I);
}
/* Fall through */
OpCase(error_action_code): {
handle_error:
SWAPOUT;
I = handle_error(c_p, NULL, reg, NULL);
post_error_handling:
if (I == 0) {
goto do_schedule;
} else {
ASSERT(!is_value(r(0)));
SWAPIN;
Goto(*I);
}
}
OpCase(i_func_info_IaaI): {
ErtsCodeInfo *ci = (ErtsCodeInfo*)I;
c_p->freason = EXC_FUNCTION_CLAUSE;
c_p->current = &ci->mfa;
goto handle_error;
}
#include "beam_cold.h"
#ifdef ERTS_OPCODE_COUNTER_SUPPORT
DEFINE_COUNTING_LABELS;
#endif
#ifndef NO_JUMP_TABLE
#ifdef DEBUG
end_emulator_loop:
#endif
#endif
OpCase(int_code_end):
OpCase(label_L):
OpCase(on_load):
OpCase(line_I):
erts_exit(ERTS_ERROR_EXIT, "meta op\n");
/*
* One-time initialization of Beam emulator.
*/
init_emulator:
{
#ifndef NO_JUMP_TABLE
#ifdef ERTS_OPCODE_COUNTER_SUPPORT
#ifdef DEBUG
counting_opcodes[op_catch_end_y] = LabelAddr(lb_catch_end_y);
#endif
counting_opcodes[op_i_func_info_IaaI] = LabelAddr(lb_i_func_info_IaaI);
beam_ops = counting_opcodes;
#else /* #ifndef ERTS_OPCODE_COUNTER_SUPPORT */
beam_ops = opcodes;
#endif /* ERTS_OPCODE_COUNTER_SUPPORT */
#endif /* NO_JUMP_TABLE */
init_emulator_finish();
return;
}
#ifdef NO_JUMP_TABLE
default:
erts_exit(ERTS_ERROR_EXIT, "unexpected op code %d\n",Go);
}
#endif
return; /* Never executed */
save_calls1:
{
BeamInstr dis_next;