984 lines
24 KiB
C
984 lines
24 KiB
C
/***********************************************************************/
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/* */
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/* Objective Caml */
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/* */
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/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
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/* */
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/* Copyright 1996 Institut National de Recherche en Informatique et */
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/* en Automatique. All rights reserved. This file is distributed */
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/* under the terms of the GNU Library General Public License. */
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/* */
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/***********************************************************************/
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/* $Id$ */
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/* The bytecode interpreter */
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#include "alloc.h"
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#include "callback.h"
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#include "debugger.h"
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#include "fail.h"
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#include "fix_code.h"
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#include "instrtrace.h"
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#include "instruct.h"
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#include "interp.h"
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#include "major_gc.h"
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#include "memory.h"
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#include "misc.h"
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#include "mlvalues.h"
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#include "prims.h"
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#include "signals.h"
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#include "stacks.h"
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/* Registers for the abstract machine:
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pc the code pointer
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sp the stack pointer (grows downward)
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accu the accumulator
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env heap-allocated environment
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trapsp pointer to the current trap frame
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extra_args number of extra arguments provided by the caller
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sp is a local copy of the global variable extern_sp. */
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/* Instruction decoding */
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#ifdef THREADED_CODE
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# define Instruct(name) lbl_##name
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# if defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
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# define Jumptbl_base ((char *) &&lbl_ACC0)
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# else
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# define Jumptbl_base ((char *) 0)
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# define jumptbl_base ((char *) 0)
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# endif
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# ifdef DEBUG
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# define Next goto next_instr
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# else
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# define Next goto *(void *)(jumptbl_base + *pc++)
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# endif
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#else
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# define Instruct(name) case name
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# define Next break
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#endif
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/* GC interface */
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#define Setup_for_gc { sp -= 2; sp[0] = accu; sp[1] = env; extern_sp = sp; }
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#define Restore_after_gc { accu = sp[0]; env = sp[1]; sp += 2; }
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#define Setup_for_c_call { *--sp = env; extern_sp = sp; }
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#define Restore_after_c_call { sp = extern_sp; env = *sp++; }
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/* An event frame must look like accu + a C_CALL frame + a RETURN 1 frame */
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#define Setup_for_event \
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{ sp -= 6; \
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sp[0] = accu; /* accu */ \
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sp[1] = Val_unit; /* C_CALL frame: dummy environment */ \
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sp[2] = Val_unit; /* RETURN frame: dummy local 0 */ \
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sp[3] = (value) pc; /* RETURN frame: saved return address */ \
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sp[4] = env; /* RETURN frame: saved environment */ \
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sp[5] = Val_long(extra_args); /* RETURN frame: saved extra args */ \
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extern_sp = sp; }
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#define Restore_after_event \
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{ sp = extern_sp; accu = sp[0]; \
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pc = (code_t) sp[3]; env = sp[4]; extra_args = Long_val(sp[5]); \
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sp += 6; }
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/* Debugger interface */
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#define Setup_for_debugger \
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{ sp -= 4; \
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sp[0] = accu; sp[1] = (value)(pc - 1); \
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sp[2] = env; sp[3] = Val_long(extra_args); \
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extern_sp = sp; }
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#define Restore_after_debugger { sp += 4; }
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#ifdef THREADED_CODE
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#define Restart_curr_instr \
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goto *(jumptable[saved_code[pc - 1 - start_code]])
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#else
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#define Restart_curr_instr \
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curr_instr = saved_code[pc - 1 - start_code]; \
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goto dispatch_instr
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#endif
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/* Register optimization.
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Some compilers underestimate the use of the local variables representing
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the abstract machine registers, and don't put them in hardware registers,
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which slows down the interpreter considerably.
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For GCC, I have hand-assigned hardware registers for several architectures.
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*/
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#if defined(__GNUC__) && !defined(DEBUG)
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#ifdef __mips__
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#define PC_REG asm("$16")
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#define SP_REG asm("$17")
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#define ACCU_REG asm("$18")
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#endif
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#ifdef __sparc__
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#define PC_REG asm("%l0")
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#define SP_REG asm("%l1")
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#define ACCU_REG asm("%l2")
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#endif
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#ifdef __alpha__
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#ifdef __CRAY__
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#define PC_REG asm("r9")
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#define SP_REG asm("r10")
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#define ACCU_REG asm("r11")
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#define JUMPTBL_BASE_REG asm("r12")
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#else
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#define PC_REG asm("$9")
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#define SP_REG asm("$10")
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#define ACCU_REG asm("$11")
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#define JUMPTBL_BASE_REG asm("$12")
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#endif
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#endif
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#ifdef __i386__
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#define PC_REG asm("%esi")
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#define SP_REG asm("%edi")
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#define ACCU_REG
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#endif
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#if defined(PPC) || defined(_POWER) || defined(_IBMR2)
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#define PC_REG asm("26")
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#define SP_REG asm("27")
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#define ACCU_REG asm("28")
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#endif
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#ifdef __hppa__
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#define PC_REG asm("%r18")
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#define SP_REG asm("%r17")
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#define ACCU_REG asm("%r16")
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#endif
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#ifdef __mc68000__
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#define PC_REG asm("a5")
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#define SP_REG asm("a4")
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#define ACCU_REG asm("d7")
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#endif
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#ifdef __arm__
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#define PC_REG asm("r9")
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#define SP_REG asm("r8")
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#define ACCU_REG asm("r7")
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#endif
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#endif
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/* The interpreter itself */
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value interprete(code_t prog, asize_t prog_size)
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{
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#ifdef PC_REG
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register code_t pc PC_REG;
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register value * sp SP_REG;
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register value accu ACCU_REG;
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#else
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register code_t pc;
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register value * sp;
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register value accu;
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#endif
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#if defined(THREADED_CODE) && defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
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#ifdef JUMPTBL_BASE_REG
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register char * jumptbl_base JUMPTBL_BASE_REG;
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#else
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register char * jumptbl_base;
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#endif
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#endif
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value env;
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long extra_args;
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struct longjmp_buffer * initial_external_raise;
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int initial_sp_offset;
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/* volatile prevents collapsing initial_local_roots with another
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local variable, like Digital Unix 4.0 C compiler does (wrongly) */
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struct caml__roots_block * volatile initial_local_roots;
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struct longjmp_buffer raise_buf;
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value * modify_dest, modify_newval;
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#ifndef THREADED_CODE
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opcode_t curr_instr;
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#endif
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#ifdef THREADED_CODE
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static void * jumptable[] = {
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# include "jumptbl.h"
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};
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#endif
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if (prog == NULL) { /* Interpreter is initializing */
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#ifdef THREADED_CODE
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instr_table = (char **) jumptable;
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instr_base = Jumptbl_base;
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#endif
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return Val_unit;
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}
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#if defined(THREADED_CODE) && defined(ARCH_SIXTYFOUR) && !defined(ARCH_CODE32)
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jumptbl_base = Jumptbl_base;
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#endif
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initial_local_roots = local_roots;
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initial_sp_offset = (char *) stack_high - (char *) extern_sp;
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initial_external_raise = external_raise;
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callback_depth++;
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if (sigsetjmp(raise_buf.buf, 0)) {
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local_roots = initial_local_roots;
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accu = exn_bucket;
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goto raise_exception;
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}
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external_raise = &raise_buf;
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sp = extern_sp;
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pc = prog;
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extra_args = 0;
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env = Atom(0);
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accu = Val_int(0);
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#ifdef THREADED_CODE
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#ifdef DEBUG
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next_instr:
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if (icount-- == 0) stop_here ();
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Assert(sp >= stack_low);
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Assert(sp <= stack_high);
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#endif
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goto *(void *)(jumptbl_base + *pc++); /* Jump to the first instruction */
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#else
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while(1) {
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#ifdef DEBUG
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if (icount-- == 0) stop_here ();
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if (trace_flag) disasm_instr(pc);
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Assert(sp >= stack_low);
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Assert(sp <= stack_high);
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#endif
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curr_instr = *pc++;
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dispatch_instr:
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switch(curr_instr) {
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#endif
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/* Basic stack operations */
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Instruct(ACC0):
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accu = sp[0]; Next;
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Instruct(ACC1):
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accu = sp[1]; Next;
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Instruct(ACC2):
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accu = sp[2]; Next;
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Instruct(ACC3):
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accu = sp[3]; Next;
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Instruct(ACC4):
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accu = sp[4]; Next;
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Instruct(ACC5):
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accu = sp[5]; Next;
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Instruct(ACC6):
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accu = sp[6]; Next;
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Instruct(ACC7):
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accu = sp[7]; Next;
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Instruct(PUSH): Instruct(PUSHACC0):
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*--sp = accu; Next;
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Instruct(PUSHACC1):
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*--sp = accu; accu = sp[1]; Next;
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Instruct(PUSHACC2):
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*--sp = accu; accu = sp[2]; Next;
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Instruct(PUSHACC3):
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*--sp = accu; accu = sp[3]; Next;
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Instruct(PUSHACC4):
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*--sp = accu; accu = sp[4]; Next;
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Instruct(PUSHACC5):
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*--sp = accu; accu = sp[5]; Next;
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Instruct(PUSHACC6):
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*--sp = accu; accu = sp[6]; Next;
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Instruct(PUSHACC7):
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*--sp = accu; accu = sp[7]; Next;
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Instruct(PUSHACC):
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*--sp = accu;
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/* Fallthrough */
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Instruct(ACC):
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accu = sp[*pc++];
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Next;
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Instruct(POP):
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sp += *pc++;
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Next;
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Instruct(ASSIGN):
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sp[*pc++] = accu;
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accu = Val_unit;
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Next;
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/* Access in heap-allocated environment */
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Instruct(ENVACC1):
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accu = Field(env, 1); Next;
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Instruct(ENVACC2):
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accu = Field(env, 2); Next;
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Instruct(ENVACC3):
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accu = Field(env, 3); Next;
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Instruct(ENVACC4):
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accu = Field(env, 4); Next;
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Instruct(PUSHENVACC1):
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*--sp = accu; accu = Field(env, 1); Next;
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Instruct(PUSHENVACC2):
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*--sp = accu; accu = Field(env, 2); Next;
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Instruct(PUSHENVACC3):
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*--sp = accu; accu = Field(env, 3); Next;
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Instruct(PUSHENVACC4):
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*--sp = accu; accu = Field(env, 4); Next;
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Instruct(PUSHENVACC):
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*--sp = accu;
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/* Fallthrough */
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Instruct(ENVACC):
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accu = Field(env, *pc++);
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Next;
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/* Function application */
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Instruct(PUSH_RETADDR): {
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sp -= 3;
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sp[0] = (value) (pc + *pc);
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sp[1] = env;
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sp[2] = Val_long(extra_args);
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pc++;
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Next;
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}
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Instruct(APPLY): {
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extra_args = *pc - 1;
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pc = Code_val(accu);
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env = accu;
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goto check_stacks;
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}
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Instruct(APPLY1): {
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value arg1 = sp[0];
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sp -= 3;
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sp[0] = arg1;
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sp[1] = (value)pc;
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sp[2] = env;
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sp[3] = Val_long(extra_args);
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pc = Code_val(accu);
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env = accu;
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extra_args = 0;
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goto check_stacks;
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}
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Instruct(APPLY2): {
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value arg1 = sp[0];
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value arg2 = sp[1];
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sp -= 3;
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sp[0] = arg1;
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sp[1] = arg2;
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sp[2] = (value)pc;
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sp[3] = env;
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sp[4] = Val_long(extra_args);
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pc = Code_val(accu);
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env = accu;
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extra_args = 1;
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goto check_stacks;
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}
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Instruct(APPLY3): {
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value arg1 = sp[0];
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value arg2 = sp[1];
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value arg3 = sp[2];
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sp -= 3;
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sp[0] = arg1;
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sp[1] = arg2;
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sp[2] = arg3;
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sp[3] = (value)pc;
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sp[4] = env;
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sp[5] = Val_long(extra_args);
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pc = Code_val(accu);
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env = accu;
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extra_args = 2;
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goto check_stacks;
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}
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Instruct(APPTERM): {
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int nargs = *pc++;
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int slotsize = *pc;
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value * newsp;
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int i;
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/* Slide the nargs bottom words of the current frame to the top
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of the frame, and discard the remainder of the frame */
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newsp = sp + slotsize - nargs;
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for (i = nargs - 1; i >= 0; i--) newsp[i] = sp[i];
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sp = newsp;
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pc = Code_val(accu);
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env = accu;
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extra_args += nargs - 1;
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goto check_stacks;
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}
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Instruct(APPTERM1): {
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value arg1 = sp[0];
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sp = sp + *pc - 1;
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sp[0] = arg1;
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pc = Code_val(accu);
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env = accu;
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goto check_stacks;
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}
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Instruct(APPTERM2): {
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value arg1 = sp[0];
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value arg2 = sp[1];
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sp = sp + *pc - 2;
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sp[0] = arg1;
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sp[1] = arg2;
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pc = Code_val(accu);
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env = accu;
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extra_args += 1;
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goto check_stacks;
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}
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Instruct(APPTERM3): {
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value arg1 = sp[0];
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value arg2 = sp[1];
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value arg3 = sp[2];
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sp = sp + *pc - 3;
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sp[0] = arg1;
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sp[1] = arg2;
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sp[2] = arg3;
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pc = Code_val(accu);
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env = accu;
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extra_args += 2;
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goto check_stacks;
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}
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Instruct(RETURN): {
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sp += *pc++;
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if (extra_args > 0) {
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extra_args--;
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pc = Code_val(accu);
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env = accu;
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} else {
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pc = (code_t)(sp[0]);
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env = sp[1];
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extra_args = Long_val(sp[2]);
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sp += 3;
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}
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Next;
|
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}
|
|
|
|
Instruct(RESTART): {
|
|
int num_args = Wosize_val(env) - 2;
|
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int i;
|
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sp -= num_args;
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for (i = 0; i < num_args; i++) sp[i] = Field(env, i + 2);
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env = Field(env, 1);
|
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extra_args += num_args;
|
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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 + 2, Closure_tag);
|
|
Field(accu, 1) = env;
|
|
for (i = 0; i < num_args; i++) Field(accu, i + 2) = sp[i];
|
|
Code_val(accu) = pc - 3; /* Point to the preceding RESTART instr. */
|
|
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;
|
|
Alloc_small(accu, 1 + nvars, Closure_tag);
|
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Code_val(accu) = pc + *pc;
|
|
pc++;
|
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for (i = 0; i < nvars; i++) Field(accu, i + 1) = sp[i];
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sp += nvars;
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Next;
|
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}
|
|
|
|
Instruct(CLOSUREREC): {
|
|
int nfuncs = *pc++;
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|
int nvars = *pc++;
|
|
int i;
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|
value * p;
|
|
if (nvars > 0) *--sp = accu;
|
|
Alloc_small(accu, nfuncs * 2 - 1 + nvars, Closure_tag);
|
|
p = &Field(accu, nfuncs * 2 - 1);
|
|
for (i = 0; i < nvars; i++) {
|
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*p++ = sp[i];
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}
|
|
sp += nvars;
|
|
p = &Field(accu, 0);
|
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*p = (value) (pc + pc[0]);
|
|
*--sp = accu;
|
|
p++;
|
|
for (i = 1; i < nfuncs; i++) {
|
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*p = Make_header(i * 2, Infix_tag, Caml_white); /* color irrelevant. */
|
|
p++;
|
|
*p = (value) (pc + pc[i]);
|
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*--sp = (value) p;
|
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p++;
|
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}
|
|
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(global_data, *pc);
|
|
pc++;
|
|
Next;
|
|
|
|
Instruct(PUSHGETGLOBALFIELD):
|
|
*--sp = accu;
|
|
/* Fallthrough */
|
|
Instruct(GETGLOBALFIELD): {
|
|
accu = Field(global_data, *pc);
|
|
pc++;
|
|
accu = Field(accu, *pc);
|
|
pc++;
|
|
Next;
|
|
}
|
|
|
|
Instruct(SETGLOBAL):
|
|
modify(&Field(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;
|
|
Alloc_small(block, wosize, tag);
|
|
Field(block, 0) = accu;
|
|
for (i = 1; i < wosize; i++) 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;
|
|
Alloc_small(block, size * Double_wosize, Double_array_tag);
|
|
Store_double_field(block, 0, Double_val(accu));
|
|
for (i = 1; i < size; i++){
|
|
Store_double_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_field(accu, *pc);
|
|
Alloc_small(accu, Double_wosize, Double_tag);
|
|
Store_double_val(accu, d);
|
|
pc++;
|
|
Next;
|
|
}
|
|
|
|
Instruct(SETFIELD0):
|
|
modify_dest = &Field(accu, 0);
|
|
modify_newval = *sp++;
|
|
modify:
|
|
Modify(modify_dest, modify_newval);
|
|
accu = Val_unit;
|
|
Next;
|
|
Instruct(SETFIELD1):
|
|
modify_dest = &Field(accu, 1);
|
|
modify_newval = *sp++;
|
|
goto modify;
|
|
Instruct(SETFIELD2):
|
|
modify_dest = &Field(accu, 2);
|
|
modify_newval = *sp++;
|
|
goto modify;
|
|
Instruct(SETFIELD3):
|
|
modify_dest = &Field(accu, 3);
|
|
modify_newval = *sp++;
|
|
goto modify;
|
|
Instruct(SETFIELD):
|
|
modify_dest = &Field(accu, *pc);
|
|
pc++;
|
|
modify_newval = *sp++;
|
|
goto modify;
|
|
Instruct(SETFLOATFIELD):
|
|
Store_double_field(accu, *pc, Double_val(*sp));
|
|
accu = Val_unit;
|
|
sp++;
|
|
pc++;
|
|
Next;
|
|
|
|
/* Array operations */
|
|
|
|
Instruct(VECTLENGTH): {
|
|
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):
|
|
modify_dest = &Field(accu, Long_val(sp[0]));
|
|
modify_newval = sp[1];
|
|
sp += 2;
|
|
goto modify;
|
|
|
|
/* String operations */
|
|
|
|
Instruct(GETSTRINGCHAR):
|
|
accu = Val_int(Byte_u(accu, Long_val(sp[0])));
|
|
sp += 1;
|
|
Next;
|
|
Instruct(SETSTRINGCHAR):
|
|
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 sizes = *pc++;
|
|
if (Is_block(accu)) {
|
|
long index = Tag_val(accu);
|
|
Assert(index >= 0 && index < (sizes >> 16));
|
|
pc += pc[(sizes & 0xFFFF) + index];
|
|
} else {
|
|
long index = Long_val(accu);
|
|
if ((unsigned long) index < (sizes & 0xFFFF))
|
|
pc += pc[index];
|
|
else
|
|
pc += (sizes & 0xFFFF) + (sizes >> 16);
|
|
}
|
|
Next;
|
|
}
|
|
Instruct(BOOLNOT):
|
|
accu = Val_not(accu);
|
|
Next;
|
|
|
|
/* Exceptions */
|
|
|
|
Instruct(PUSHTRAP):
|
|
sp -= 4;
|
|
Trap_pc(sp) = pc + *pc;
|
|
Trap_link(sp) = trapsp;
|
|
sp[2] = env;
|
|
sp[3] = Val_long(extra_args);
|
|
trapsp = sp;
|
|
pc++;
|
|
Next;
|
|
|
|
Instruct(POPTRAP):
|
|
if (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_signal;
|
|
}
|
|
trapsp = Trap_link(sp);
|
|
sp += 4;
|
|
Next;
|
|
|
|
Instruct(RAISE):
|
|
raise_exception:
|
|
if (trapsp >= trap_barrier) debugger(TRAP_BARRIER);
|
|
sp = trapsp;
|
|
if ((char *) sp >= (char *) stack_high - initial_sp_offset) {
|
|
external_raise = initial_external_raise;
|
|
callback_depth--;
|
|
return Make_exception_result(accu);
|
|
}
|
|
pc = Trap_pc(sp);
|
|
trapsp = Trap_link(sp);
|
|
env = sp[2];
|
|
extra_args = Long_val(sp[3]);
|
|
sp += 4;
|
|
Next;
|
|
|
|
/* Stack checks */
|
|
|
|
check_stacks:
|
|
if (sp < stack_threshold) {
|
|
extern_sp = sp;
|
|
realloc_stack();
|
|
sp = extern_sp;
|
|
}
|
|
/* Fall through CHECK_SIGNALS */
|
|
|
|
/* Signal handling */
|
|
|
|
Instruct(CHECK_SIGNALS): /* accu not preserved */
|
|
if (something_to_do) goto process_signal;
|
|
Next;
|
|
|
|
process_signal:
|
|
something_to_do = 0;
|
|
Setup_for_event;
|
|
process_event();
|
|
Restore_after_event;
|
|
Next;
|
|
|
|
/* Calling C functions */
|
|
|
|
Instruct(C_CALL1):
|
|
Setup_for_c_call;
|
|
accu = cprim[*pc](accu);
|
|
Restore_after_c_call;
|
|
pc++;
|
|
Next;
|
|
Instruct(C_CALL2):
|
|
Setup_for_c_call;
|
|
accu = cprim[*pc](accu, sp[1]);
|
|
Restore_after_c_call;
|
|
sp += 1;
|
|
pc++;
|
|
Next;
|
|
Instruct(C_CALL3):
|
|
Setup_for_c_call;
|
|
accu = cprim[*pc](accu, sp[1], sp[2]);
|
|
Restore_after_c_call;
|
|
sp += 2;
|
|
pc++;
|
|
Next;
|
|
Instruct(C_CALL4):
|
|
Setup_for_c_call;
|
|
accu = cprim[*pc](accu, sp[1], sp[2], sp[3]);
|
|
Restore_after_c_call;
|
|
sp += 3;
|
|
pc++;
|
|
Next;
|
|
Instruct(C_CALL5):
|
|
Setup_for_c_call;
|
|
accu = cprim[*pc](accu, sp[1], sp[2], sp[3], sp[4]);
|
|
Restore_after_c_call;
|
|
sp += 4;
|
|
pc++;
|
|
Next;
|
|
Instruct(C_CALLN): {
|
|
int nargs = *pc++;
|
|
*--sp = accu;
|
|
Setup_for_c_call;
|
|
accu = cprim[*pc](sp + 1, 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;
|
|
|
|
/* Integer arithmetic */
|
|
|
|
Instruct(NEGINT):
|
|
accu = (value)(2 - (long)accu); Next;
|
|
Instruct(ADDINT):
|
|
accu = (value)((long) accu + (long) *sp++ - 1); Next;
|
|
Instruct(SUBINT):
|
|
accu = (value)((long) accu - (long) *sp++ + 1); Next;
|
|
Instruct(MULINT):
|
|
accu = Val_long(Long_val(accu) * Long_val(*sp++)); Next;
|
|
|
|
Instruct(DIVINT): {
|
|
long divisor = Long_val(*sp++);
|
|
if (divisor == 0) { Setup_for_c_call; raise_zero_divide(); }
|
|
accu = Val_long(Long_val(accu) / divisor);
|
|
Next;
|
|
}
|
|
Instruct(MODINT): {
|
|
long divisor = Long_val(*sp++);
|
|
if (divisor == 0) { Setup_for_c_call; raise_zero_divide(); }
|
|
accu = Val_long(Long_val(accu) % divisor);
|
|
Next;
|
|
}
|
|
Instruct(ANDINT):
|
|
accu = (value)((long) accu & (long) *sp++); Next;
|
|
Instruct(ORINT):
|
|
accu = (value)((long) accu | (long) *sp++); Next;
|
|
Instruct(XORINT):
|
|
accu = (value)(((long) accu ^ (long) *sp++) | 1); Next;
|
|
Instruct(LSLINT):
|
|
accu = (value)((((long) accu - 1) << Long_val(*sp++)) + 1); Next;
|
|
Instruct(LSRINT):
|
|
accu = (value)((((unsigned long) accu - 1) >> Long_val(*sp++)) | 1);
|
|
Next;
|
|
Instruct(ASRINT):
|
|
accu = (value)((((long) accu - 1) >> Long_val(*sp++)) | 1); Next;
|
|
|
|
#define Integer_comparison(opname,tst) \
|
|
Instruct(opname): \
|
|
accu = Val_int((long) accu tst (long) *sp++); Next;
|
|
|
|
Integer_comparison(EQ, ==)
|
|
Integer_comparison(NEQ, !=)
|
|
Integer_comparison(LTINT, <)
|
|
Integer_comparison(LEINT, <=)
|
|
Integer_comparison(GTINT, >)
|
|
Integer_comparison(GEINT, >=)
|
|
|
|
Instruct(OFFSETINT):
|
|
accu += *pc << 1;
|
|
pc++;
|
|
Next;
|
|
Instruct(OFFSETREF):
|
|
Field(accu, 0) += *pc << 1;
|
|
accu = Val_unit;
|
|
pc++;
|
|
Next;
|
|
Instruct(ISINT):
|
|
accu = Val_long(accu & 1);
|
|
Next;
|
|
|
|
/* Object-oriented operations */
|
|
|
|
#define Lookup(obj, lab) \
|
|
Field (Field (Field (obj, 0), ((lab) >> 16) / sizeof (value)), \
|
|
((lab) / sizeof (value)) & 0xFF)
|
|
|
|
Instruct(GETMETHOD):
|
|
accu = Lookup(sp[0], accu);
|
|
Next;
|
|
|
|
/* Debugging and machine control */
|
|
|
|
Instruct(STOP):
|
|
external_raise = initial_external_raise;
|
|
extern_sp = sp;
|
|
callback_depth--;
|
|
return accu;
|
|
|
|
Instruct(EVENT):
|
|
if (--event_count == 0) {
|
|
Setup_for_debugger;
|
|
debugger(EVENT_COUNT);
|
|
Restore_after_debugger;
|
|
}
|
|
Restart_curr_instr;
|
|
|
|
Instruct(BREAK):
|
|
Setup_for_debugger;
|
|
debugger(BREAKPOINT);
|
|
Restore_after_debugger;
|
|
Restart_curr_instr;
|
|
|
|
#ifndef THREADED_CODE
|
|
default:
|
|
fatal_error_arg("Fatal error: bad opcode (%lx)\n",
|
|
(char *)(long)(*(pc-1)));
|
|
}
|
|
}
|
|
#endif
|
|
}
|