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interp.c
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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
/* */
/* Copyright 1996 Institut National de Recherche en Informatique et */
/* en Automatique. */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
/* The bytecode interpreter */
#include <stdio.h>
#include "caml/alloc.h"
#include "caml/backtrace.h"
#include "caml/callback.h"
#include "caml/debugger.h"
#include "caml/fail.h"
#include "caml/fix_code.h"
#include "caml/instrtrace.h"
#include "caml/instruct.h"
#include "caml/interp.h"
#include "caml/major_gc.h"
#include "caml/memory.h"
#include "caml/misc.h"
#include "caml/mlvalues.h"
#include "caml/prims.h"
#include "caml/signals.h"
#include "caml/stacks.h"
#include "caml/startup_aux.h"
/* Registers for the abstract machine:
pc the code pointer
sp the stack pointer (grows downward)
accu the accumulator
env heap-allocated environment
Caml_state->trapsp pointer to the current trap frame
extra_args number of extra arguments provided by the caller
sp is a local copy of the global variable Caml_state->extern_sp. */
/* Instruction decoding */
#ifdef THREADED_CODE
# define Instruct(name) lbl_##name
# if defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
# define Jumptbl_base ((char *) &&lbl_ACC0)
# else
# define Jumptbl_base ((char *) 0)
# define jumptbl_base ((char *) 0)
# endif
# ifdef DEBUG
# define Next goto next_instr
# else
# define Next goto *(void *)(jumptbl_base + *pc++)
# endif
#else
# define Instruct(name) case name
# define Next break
#endif
/* GC interface */
#undef Alloc_small_origin
// Do call asynchronous callbacks from allocation functions
#define Alloc_small_origin CAML_FROM_CAML
#define Setup_for_gc \
{ sp -= 3; sp[0] = accu; sp[1] = env; sp[2] = (value)pc; \
Caml_state->extern_sp = sp; }
#define Restore_after_gc \
{ sp = Caml_state->extern_sp; accu = sp[0]; env = sp[1]; sp += 3; }
/* We store [pc+1] in the stack so that, in case of an exception, the
first backtrace slot points to the event following the C call
instruction. */
#define Setup_for_c_call \
{ sp -= 2; sp[0] = env; sp[1] = (value)(pc + 1); Caml_state->extern_sp = sp; }
#define Restore_after_c_call \
{ sp = Caml_state->extern_sp; env = *sp; sp += 2; }
/* For VM threads purposes, an event frame must look like accu + a
C_CALL frame + a RETURN 1 frame.
TODO: now that VM threads are gone, we could get rid of that. But
we need to make sure that this is not used elsewhere. */
#define Setup_for_event \
{ sp -= 6; \
sp[0] = accu; /* accu */ \
sp[1] = Val_unit; /* C_CALL frame: dummy environment */ \
sp[2] = Val_unit; /* RETURN frame: dummy local 0 */ \
sp[3] = (value) pc; /* RETURN frame: saved return address */ \
sp[4] = env; /* RETURN frame: saved environment */ \
sp[5] = Val_long(extra_args); /* RETURN frame: saved extra args */ \
Caml_state->extern_sp = sp; }
#define Restore_after_event \
{ sp = Caml_state->extern_sp; accu = sp[0]; \
pc = (code_t) sp[3]; env = sp[4]; extra_args = Long_val(sp[5]); \
sp += 6; }
/* Debugger interface */
#define Setup_for_debugger \
{ sp -= 4; \
sp[0] = accu; sp[1] = (value)(pc - 1); \
sp[2] = env; sp[3] = Val_long(extra_args); \
Caml_state->extern_sp = sp; }
#define Restore_after_debugger \
{ CAMLassert(sp == Caml_state->extern_sp); \
CAMLassert(sp[0] == accu); \
CAMLassert(sp[2] == env); \
sp += 4; }
#ifdef THREADED_CODE
#define Restart_curr_instr \
goto *((void*)(jumptbl_base + caml_debugger_saved_instruction(pc - 1)))
#else
#define Restart_curr_instr \
curr_instr = caml_debugger_saved_instruction(pc - 1); \
goto dispatch_instr
#endif
#define Check_trap_barrier \
if (Caml_state->trapsp >= Caml_state->trap_barrier) \
caml_debugger(TRAP_BARRIER, Val_unit)
/* Register optimization.
Some compilers underestimate the use of the local variables representing
the abstract machine registers, and don't put them in hardware registers,
which slows down the interpreter considerably.
For GCC, I have hand-assigned hardware registers for several architectures.
*/
#if defined(__GNUC__) && !defined(DEBUG) && !defined(__INTEL_COMPILER) \
&& !defined(__llvm__)
#ifdef __mips__
#define PC_REG asm("$16")
#define SP_REG asm("$17")
#define ACCU_REG asm("$18")
#endif
#ifdef __sparc__
#define PC_REG asm("%l0")
#define SP_REG asm("%l1")
#define ACCU_REG asm("%l2")
#endif
#ifdef __alpha__
#ifdef __CRAY__
#define PC_REG asm("r9")
#define SP_REG asm("r10")
#define ACCU_REG asm("r11")
#define JUMPTBL_BASE_REG asm("r12")
#else
#define PC_REG asm("$9")
#define SP_REG asm("$10")
#define ACCU_REG asm("$11")
#define JUMPTBL_BASE_REG asm("$12")
#endif
#endif
#ifdef __i386__
#define PC_REG asm("%esi")
#define SP_REG asm("%edi")
#define ACCU_REG
#endif
#if defined(__ppc__) || defined(__ppc64__)
#define PC_REG asm("26")
#define SP_REG asm("27")
#define ACCU_REG asm("28")
#endif
#ifdef __hppa__
#define PC_REG asm("%r18")
#define SP_REG asm("%r17")
#define ACCU_REG asm("%r16")
#endif
#ifdef __mc68000__
#define PC_REG asm("a5")
#define SP_REG asm("a4")
#define ACCU_REG asm("d7")
#endif
/* PR#4953: these specific registers not available in Thumb mode */
#if defined (__arm__) && !defined(__thumb__)
#define PC_REG asm("r6")
#define SP_REG asm("r8")
#define ACCU_REG asm("r7")
#endif
#ifdef __ia64__
#define PC_REG asm("36")
#define SP_REG asm("37")
#define ACCU_REG asm("38")
#define JUMPTBL_BASE_REG asm("39")
#endif
#ifdef __x86_64__
#define PC_REG asm("%r15")
#define SP_REG asm("%r14")
#define ACCU_REG asm("%r13")
#endif
#ifdef __aarch64__
#define PC_REG asm("%x19")
#define SP_REG asm("%x20")
#define ACCU_REG asm("%x21")
#define JUMPTBL_BASE_REG asm("%x22")
#endif
#endif
#ifdef DEBUG
static intnat caml_bcodcount;
#endif
/* The interpreter itself */
value caml_interprete(code_t prog, asize_t prog_size)
{
#ifdef PC_REG
register code_t pc PC_REG;
register value * sp SP_REG;
register value accu ACCU_REG;
#else
register code_t pc;
register value * sp;
register value accu;
#endif
#if defined(THREADED_CODE) && defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
#ifdef JUMPTBL_BASE_REG
register char * jumptbl_base JUMPTBL_BASE_REG;
#else
register char * jumptbl_base;
#endif
#endif
value env;
intnat extra_args;
struct longjmp_buffer * initial_external_raise;
intnat initial_sp_offset;
/* volatile ensures that initial_local_roots
will keep correct value across longjmp */
struct caml__roots_block * volatile initial_local_roots;
struct longjmp_buffer raise_buf;
#ifndef THREADED_CODE
opcode_t curr_instr;
#endif
#ifdef THREADED_CODE
static void * jumptable[] = {
# include "caml/jumptbl.h"
};
#endif
if (prog == NULL) { /* Interpreter is initializing */
#ifdef THREADED_CODE
caml_instr_table = (char **) jumptable;
caml_instr_base = Jumptbl_base;
#endif
return Val_unit;
}
#if defined(THREADED_CODE) && defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
jumptbl_base = Jumptbl_base;
#endif
initial_local_roots = Caml_state->local_roots;
initial_sp_offset =
(char *) Caml_state->stack_high - (char *) Caml_state->extern_sp;
initial_external_raise = Caml_state->external_raise;
caml_callback_depth++;
if (sigsetjmp(raise_buf.buf, 0)) {
Caml_state->local_roots = initial_local_roots;
sp = Caml_state->extern_sp;
accu = Caml_state->exn_bucket;
Check_trap_barrier;
if (Caml_state->backtrace_active) {
/* pc has already been pushed on the stack when calling the C
function that raised the exception. No need to push it again
here. */
caml_stash_backtrace(accu, sp, 0);
}
goto raise_notrace;
}
Caml_state->external_raise = &raise_buf;
sp = Caml_state->extern_sp;
pc = prog;
extra_args = 0;
env = Atom(0);
accu = Val_int(0);
#ifdef THREADED_CODE
#ifdef DEBUG
next_instr:
if (caml_icount-- == 0) caml_stop_here ();
CAMLassert(sp >= Caml_state->stack_low);
CAMLassert(sp <= Caml_state->stack_high);
#endif
goto *(void *)(jumptbl_base + *pc++); /* Jump to the first instruction */
#else
while(1) {
#ifdef DEBUG
caml_bcodcount++;
if (caml_icount-- == 0) caml_stop_here ();
if (caml_trace_level>1) printf("\n##%" ARCH_INTNAT_PRINTF_FORMAT "d\n",
caml_bcodcount);
if (caml_trace_level>0) caml_disasm_instr(pc);
if (caml_trace_level>1) {
printf("env=");
caml_trace_value_file(env,prog,prog_size,stdout);
putchar('\n');
caml_trace_accu_sp_file(accu,sp,prog,prog_size,stdout);
fflush(stdout);
};
CAMLassert(sp >= Caml_state->stack_low);
CAMLassert(sp <= Caml_state->stack_high);
#endif
curr_instr = *pc++;
dispatch_instr:
switch(curr_instr) {
#endif
/* Basic stack operations */
Instruct(ACC0):
accu = sp[0]; Next;
Instruct(ACC1):
accu = sp[1]; Next;
Instruct(ACC2):
accu = sp[2]; Next;
Instruct(ACC3):
accu = sp[3]; Next;
Instruct(ACC4):
accu = sp[4]; Next;
Instruct(ACC5):
accu = sp[5]; Next;
Instruct(ACC6):
accu = sp[6]; Next;
Instruct(ACC7):
accu = sp[7]; Next;
Instruct(PUSH): Instruct(PUSHACC0):
*--sp = accu; Next;
Instruct(PUSHACC1):
*--sp = accu; accu = sp[1]; Next;
Instruct(PUSHACC2):
*--sp = accu; accu = sp[2]; Next;
Instruct(PUSHACC3):
*--sp = accu; accu = sp[3]; Next;
Instruct(PUSHACC4):
*--sp = accu; accu = sp[4]; Next;
Instruct(PUSHACC5):
*--sp = accu; accu = sp[5]; Next;
Instruct(PUSHACC6):
*--sp = accu; accu = sp[6]; Next;
Instruct(PUSHACC7):
*--sp = accu; accu = sp[7]; Next;
Instruct(PUSHACC):
*--sp = accu;
/* Fallthrough */
Instruct(ACC):
accu = sp[*pc++];
Next;
Instruct(POP):
sp += *pc++;
Next;
Instruct(ASSIGN):
sp[*pc++] = accu;
accu = Val_unit;
Next;
/* Access in heap-allocated environment */
Instruct(ENVACC1):
accu = Field(env, 1); Next;
Instruct(ENVACC2):
accu = Field(env, 2); Next;
Instruct(ENVACC3):
accu = Field(env, 3); Next;
Instruct(ENVACC4):
accu = Field(env, 4); Next;
Instruct(PUSHENVACC1):
*--sp = accu; accu = Field(env, 1); Next;
Instruct(PUSHENVACC2):
*--sp = accu; accu = Field(env, 2); Next;
Instruct(PUSHENVACC3):
*--sp = accu; accu = Field(env, 3); Next;
Instruct(PUSHENVACC4):
*--sp = accu; accu = Field(env, 4); Next;
Instruct(PUSHENVACC):
*--sp = accu;
/* Fallthrough */
Instruct(ENVACC):
accu = Field(env, *pc++);
Next;
/* Function application */
Instruct(PUSH_RETADDR): {
sp -= 3;
sp[0] = (value) (pc + *pc);
sp[1] = env;
sp[2] = Val_long(extra_args);
pc++;
Next;
}
Instruct(APPLY): {
extra_args = *pc - 1;
pc = Code_val(accu);
env = accu;
goto check_stacks;
}
Instruct(APPLY1): {
value arg1 = sp[0];
sp -= 3;
sp[0] = arg1;
sp[1] = (value)pc;
sp[2] = env;
sp[3] = Val_long(extra_args);
pc = Code_val(accu);
env = accu;
extra_args = 0;
goto check_stacks;
}
Instruct(APPLY2): {
value arg1 = sp[0];
value arg2 = sp[1];
sp -= 3;
sp[0] = arg1;
sp[1] = arg2;
sp[2] = (value)pc;
sp[3] = env;
sp[4] = Val_long(extra_args);
pc = Code_val(accu);
env = accu;
extra_args = 1;
goto check_stacks;
}
Instruct(APPLY3): {
value arg1 = sp[0];
value arg2 = sp[1];
value arg3 = sp[2];
sp -= 3;
sp[0] = arg1;
sp[1] = arg2;
sp[2] = arg3;
sp[3] = (value)pc;
sp[4] = env;
sp[5] = Val_long(extra_args);
pc = Code_val(accu);
env = accu;
extra_args = 2;
goto check_stacks;
}
Instruct(APPTERM): {
int nargs = *pc++;
int slotsize = *pc;
value * newsp;
int i;
/* Slide the nargs bottom words of the current frame to the top
of the frame, and discard the remainder of the frame */
newsp = sp + slotsize - nargs;
for (i = nargs - 1; i >= 0; i--) newsp[i] = sp[i];
sp = newsp;
pc = Code_val(accu);
env = accu;
extra_args += nargs - 1;
goto check_stacks;
}
Instruct(APPTERM1): {
value arg1 = sp[0];
sp = sp + *pc - 1;
sp[0] = arg1;
pc = Code_val(accu);
env = accu;
goto check_stacks;
}
Instruct(APPTERM2): {
value arg1 = sp[0];
value arg2 = sp[1];
sp = sp + *pc - 2;
sp[0] = arg1;
sp[1] = arg2;
pc = Code_val(accu);
env = accu;
extra_args += 1;
goto check_stacks;
}
Instruct(APPTERM3): {
value arg1 = sp[0];
value arg2 = sp[1];
value arg3 = sp[2];
sp = sp + *pc - 3;
sp[0] = arg1;
sp[1] = arg2;
sp[2] = arg3;
pc = Code_val(accu);
env = accu;
extra_args += 2;
goto check_stacks;
}
Instruct(RETURN): {
sp += *pc++;
if (extra_args > 0) {
extra_args--;
pc = Code_val(accu);
env = accu;
} else {
pc = (code_t)(sp[0]);
env = sp[1];
extra_args = Long_val(sp[2]);
sp += 3;
}
Next;
}
Instruct(RESTART): {
int num_args = Wosize_val(env) - 3;
int i;
sp -= num_args;
for (i = 0; i < num_args; i++) sp[i] = Field(env, i + 3);
env = Field(env, 2);
extra_args += num_args;
Next;
}
Instruct(GRAB): {
int required = *pc++;
if (extra_args >= required) {
extra_args -= required;
} else {
mlsize_t num_args, i;
num_args = 1 + extra_args; /* arg1 + extra args */
Alloc_small(accu, num_args + 3, Closure_tag);
Field(accu, 2) = env;
for (i = 0; i < num_args; i++) Field(accu, i + 3) = sp[i];
Code_val(accu) = pc - 3; /* Point to the preceding RESTART instr. */
Closinfo_val(accu) = Make_closinfo(0, 2);
sp += num_args;
pc = (code_t)(sp[0]);
env = sp[1];
extra_args = Long_val(sp[2]);
sp += 3;
}
Next;
}
Instruct(CLOSURE): {
int nvars = *pc++;
int i;
if (nvars > 0) *--sp = accu;
if (nvars <= Max_young_wosize - 2) {
/* nvars + 2 <= Max_young_wosize, can allocate in minor heap */
Alloc_small(accu, 2 + nvars, Closure_tag);
for (i = 0; i < nvars; i++) Field(accu, i + 2) = sp[i];
} else {
/* PR#6385: must allocate in major heap */
/* caml_alloc_shr and caml_initialize never trigger a GC,
so no need to Setup_for_gc */
accu = caml_alloc_shr(2 + nvars, Closure_tag);
for (i = 0; i < nvars; i++) caml_initialize(&Field(accu, i + 2), sp[i]);
}
/* The code pointer is not in the heap, so no need to go through
caml_initialize. */
Code_val(accu) = pc + *pc;
Closinfo_val(accu) = Make_closinfo(0, 2);
pc++;
sp += nvars;
Next;
}
Instruct(CLOSUREREC): {
int nfuncs = *pc++;
int nvars = *pc++;
mlsize_t envofs = nfuncs * 3 - 1;
mlsize_t blksize = envofs + nvars;
int i;
value * p;
if (nvars > 0) *--sp = accu;
if (blksize <= Max_young_wosize) {
Alloc_small(accu, blksize, Closure_tag);
p = &Field(accu, envofs);
for (i = 0; i < nvars; i++, p++) *p = sp[i];
} else {
/* PR#6385: must allocate in major heap */
/* caml_alloc_shr and caml_initialize never trigger a GC,
so no need to Setup_for_gc */
accu = caml_alloc_shr(blksize, Closure_tag);
p = &Field(accu, envofs);
for (i = 0; i < nvars; i++, p++) caml_initialize(p, sp[i]);
}
sp += nvars;
/* The code pointers and infix headers are not in the heap,
so no need to go through caml_initialize. */
*--sp = accu;
p = &Field(accu, 0);
*p++ = (value) (pc + pc[0]);
*p++ = Make_closinfo(0, envofs);
for (i = 1; i < nfuncs; i++) {
*p++ = Make_header(i * 3, Infix_tag, Caml_white); /* color irrelevant */
*--sp = (value) p;
*p++ = (value) (pc + pc[i]);
envofs -= 3;
*p++ = Make_closinfo(0, envofs);
}
pc += nfuncs;
Next;
}
Instruct(PUSHOFFSETCLOSURE):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSURE):
accu = env + *pc++ * sizeof(value); Next;
Instruct(PUSHOFFSETCLOSUREM2):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSUREM2):
accu = env - 2 * sizeof(value); Next;
Instruct(PUSHOFFSETCLOSURE0):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSURE0):
accu = env; Next;
Instruct(PUSHOFFSETCLOSURE2):
*--sp = accu; /* fallthrough */
Instruct(OFFSETCLOSURE2):
accu = env + 2 * sizeof(value); Next;
/* Access to global variables */
Instruct(PUSHGETGLOBAL):
*--sp = accu;
/* Fallthrough */
Instruct(GETGLOBAL):
accu = Field(caml_global_data, *pc);
pc++;
Next;
Instruct(PUSHGETGLOBALFIELD):
*--sp = accu;
/* Fallthrough */
Instruct(GETGLOBALFIELD): {
accu = Field(caml_global_data, *pc);
pc++;
accu = Field(accu, *pc);
pc++;
Next;
}
Instruct(SETGLOBAL):
caml_modify(&Field(caml_global_data, *pc), accu);
accu = Val_unit;
pc++;
Next;
/* Allocation of blocks */
Instruct(PUSHATOM0):
*--sp = accu;
/* Fallthrough */
Instruct(ATOM0):
accu = Atom(0); Next;
Instruct(PUSHATOM):
*--sp = accu;
/* Fallthrough */
Instruct(ATOM):
accu = Atom(*pc++); Next;
Instruct(MAKEBLOCK): {
mlsize_t wosize = *pc++;
tag_t tag = *pc++;
mlsize_t i;
value block;
if (wosize <= Max_young_wosize) {
Alloc_small(block, wosize, tag);
Field(block, 0) = accu;
for (i = 1; i < wosize; i++) Field(block, i) = *sp++;
} else {
block = caml_alloc_shr(wosize, tag);
caml_initialize(&Field(block, 0), accu);
for (i = 1; i < wosize; i++) caml_initialize(&Field(block, i), *sp++);
}
accu = block;
Next;
}
Instruct(MAKEBLOCK1): {
tag_t tag = *pc++;
value block;
Alloc_small(block, 1, tag);
Field(block, 0) = accu;
accu = block;
Next;
}
Instruct(MAKEBLOCK2): {
tag_t tag = *pc++;
value block;
Alloc_small(block, 2, tag);
Field(block, 0) = accu;
Field(block, 1) = sp[0];
sp += 1;
accu = block;
Next;
}
Instruct(MAKEBLOCK3): {
tag_t tag = *pc++;
value block;
Alloc_small(block, 3, tag);
Field(block, 0) = accu;
Field(block, 1) = sp[0];
Field(block, 2) = sp[1];
sp += 2;
accu = block;
Next;
}
Instruct(MAKEFLOATBLOCK): {
mlsize_t size = *pc++;
mlsize_t i;
value block;
if (size <= Max_young_wosize / Double_wosize) {
Alloc_small(block, size * Double_wosize, Double_array_tag);
} else {
block = caml_alloc_shr(size * Double_wosize, Double_array_tag);
}
Store_double_flat_field(block, 0, Double_val(accu));
for (i = 1; i < size; i++){
Store_double_flat_field(block, i, Double_val(*sp));
++ sp;
}
accu = block;
Next;
}
/* Access to components of blocks */
Instruct(GETFIELD0):
accu = Field(accu, 0); Next;
Instruct(GETFIELD1):
accu = Field(accu, 1); Next;
Instruct(GETFIELD2):
accu = Field(accu, 2); Next;
Instruct(GETFIELD3):
accu = Field(accu, 3); Next;
Instruct(GETFIELD):
accu = Field(accu, *pc); pc++; Next;
Instruct(GETFLOATFIELD): {
double d = Double_flat_field(accu, *pc++);
Alloc_small(accu, Double_wosize, Double_tag);
Store_double_val(accu, d);
Next;
}
Instruct(SETFIELD0):
caml_modify(&Field(accu, 0), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD1):
caml_modify(&Field(accu, 1), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD2):
caml_modify(&Field(accu, 2), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD3):
caml_modify(&Field(accu, 3), *sp++);
accu = Val_unit;
Next;
Instruct(SETFIELD):
caml_modify(&Field(accu, *pc), *sp++);
accu = Val_unit;
pc++;
Next;
Instruct(SETFLOATFIELD):
Store_double_flat_field(accu, *pc, Double_val(*sp));
accu = Val_unit;
sp++;
pc++;
Next;
/* Array operations */
Instruct(VECTLENGTH): {
/* Todo: when FLAT_FLOAT_ARRAY is false, this instruction should
be split into VECTLENGTH and FLOATVECTLENGTH because we know
statically which one it is. */
mlsize_t size = Wosize_val(accu);
if (Tag_val(accu) == Double_array_tag) size = size / Double_wosize;
accu = Val_long(size);
Next;
}
Instruct(GETVECTITEM):
accu = Field(accu, Long_val(sp[0]));
sp += 1;
Next;
Instruct(SETVECTITEM):
caml_modify(&Field(accu, Long_val(sp[0])), sp[1]);
accu = Val_unit;
sp += 2;
Next;
/* Bytes/String operations */
Instruct(GETSTRINGCHAR):
Instruct(GETBYTESCHAR):
accu = Val_int(Byte_u(accu, Long_val(sp[0])));
sp += 1;
Next;
Instruct(SETBYTESCHAR):
Byte_u(accu, Long_val(sp[0])) = Int_val(sp[1]);
sp += 2;
accu = Val_unit;
Next;
/* Branches and conditional branches */
Instruct(BRANCH):
pc += *pc;
Next;
Instruct(BRANCHIF):
if (accu != Val_false) pc += *pc; else pc++;
Next;
Instruct(BRANCHIFNOT):
if (accu == Val_false) pc += *pc; else pc++;
Next;
Instruct(SWITCH): {
uint32_t sizes = *pc++;
if (Is_block(accu)) {
intnat index = Tag_val(accu);
CAMLassert ((uintnat) index < (sizes >> 16));
pc += pc[(sizes & 0xFFFF) + index];
} else {
intnat index = Long_val(accu);
CAMLassert ((uintnat) index < (sizes & 0xFFFF)) ;
pc += pc[index];
}
Next;
}
Instruct(BOOLNOT):
accu = Val_not(accu);
Next;
/* Exceptions */
Instruct(PUSHTRAP):
sp -= 4;
Trap_pc(sp) = pc + *pc;
Trap_link_offset(sp) = Val_long(Caml_state->trapsp - sp);
sp[2] = env;
sp[3] = Val_long(extra_args);
Caml_state->trapsp = sp;
pc++;
Next;
Instruct(POPTRAP):
if (caml_something_to_do) {
/* We must check here so that if a signal is pending and its
handler triggers an exception, the exception is trapped
by the current try...with, not the enclosing one. */
pc--; /* restart the POPTRAP after processing the signal */
goto process_actions;
}
Caml_state->trapsp = sp + Long_val(Trap_link_offset(sp));
sp += 4;
Next;
Instruct(RAISE_NOTRACE):
Check_trap_barrier;
goto raise_notrace;
Instruct(RERAISE):
Check_trap_barrier;
if (Caml_state->backtrace_active) {
*--sp = (value)(pc - 1);
caml_stash_backtrace(accu, sp, 1);
}
goto raise_notrace;
Instruct(RAISE):
Check_trap_barrier;
if (Caml_state->backtrace_active) {
*--sp = (value)(pc - 1);
caml_stash_backtrace(accu, sp, 0);
}
raise_notrace:
if ((char *) Caml_state->trapsp
>= (char *) Caml_state->stack_high - initial_sp_offset) {
Caml_state->external_raise = initial_external_raise;
Caml_state->extern_sp = (value *) ((char *) Caml_state->stack_high
- initial_sp_offset);
caml_callback_depth--;
return Make_exception_result(accu);
}
sp = Caml_state->trapsp;
pc = Trap_pc(sp);
Caml_state->trapsp = sp + Long_val(Trap_link_offset(sp));
env = sp[2];
extra_args = Long_val(sp[3]);
sp += 4;
Next;
/* Stack checks */
check_stacks:
if (sp < Caml_state->stack_threshold) {
Caml_state->extern_sp = sp;
caml_realloc_stack(Stack_threshold / sizeof(value));
sp = Caml_state->extern_sp;
}
/* Fall through CHECK_SIGNALS */
/* Signal handling */
Instruct(CHECK_SIGNALS): /* accu not preserved */
if (caml_something_to_do) goto process_actions;
Next;
process_actions:
Setup_for_event;
caml_process_pending_actions();
Restore_after_event;
Next;
/* Calling C functions */
Instruct(C_CALL1):
Setup_for_c_call;
accu = Primitive(*pc)(accu);
Restore_after_c_call;
pc++;
Next;
Instruct(C_CALL2):
Setup_for_c_call;
accu = Primitive(*pc)(accu, sp[2]);
Restore_after_c_call;
sp += 1;
pc++;
Next;
Instruct(C_CALL3):
Setup_for_c_call;
accu = Primitive(*pc)(accu, sp[2], sp[3]);
Restore_after_c_call;
sp += 2;
pc++;
Next;
Instruct(C_CALL4):
Setup_for_c_call;
accu = Primitive(*pc)(accu, sp[2], sp[3], sp[4]);
Restore_after_c_call;
sp += 3;
pc++;
Next;
Instruct(C_CALL5):
Setup_for_c_call;
accu = Primitive(*pc)(accu, sp[2], sp[3], sp[4], sp[5]);
Restore_after_c_call;
sp += 4;
pc++;
Next;
Instruct(C_CALLN): {
int nargs = *pc++;
*--sp = accu;
Setup_for_c_call;
accu = Primitive(*pc)(sp + 2, nargs);
Restore_after_c_call;
sp += nargs;
pc++;
Next;
}
/* Integer constants */
Instruct(CONST0):
accu = Val_int(0); Next;
Instruct(CONST1):
accu = Val_int(1); Next;
Instruct(CONST2):
accu = Val_int(2); Next;
Instruct(CONST3):
accu = Val_int(3); Next;
Instruct(PUSHCONST0):
*--sp = accu; accu = Val_int(0); Next;
Instruct(PUSHCONST1):
*--sp = accu; accu = Val_int(1); Next;
Instruct(PUSHCONST2):
*--sp = accu; accu = Val_int(2); Next;
Instruct(PUSHCONST3):
*--sp = accu; accu = Val_int(3); Next;
Instruct(PUSHCONSTINT):
*--sp = accu;
/* Fallthrough */
Instruct(CONSTINT):
accu = Val_int(*pc);
pc++;
Next;