diff options
Diffstat (limited to 'libguile/vm-engine.c')
-rw-r--r-- | libguile/vm-engine.c | 273 |
1 files changed, 273 insertions, 0 deletions
diff --git a/libguile/vm-engine.c b/libguile/vm-engine.c new file mode 100644 index 000000000..b373cd017 --- /dev/null +++ b/libguile/vm-engine.c @@ -0,0 +1,273 @@ +/* Copyright (C) 2001, 2009 Free Software Foundation, Inc. + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public License + * as published by the Free Software Foundation; either version 3 of + * the License, or (at your option) any later version. + * + * This library is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301 USA + */ + +/* This file is included in vm.c multiple times */ + +#if (VM_ENGINE == SCM_VM_REGULAR_ENGINE) +#define VM_USE_HOOKS 0 /* Various hooks */ +#define VM_USE_CLOCK 0 /* Bogoclock */ +#define VM_CHECK_OBJECT 1 /* Check object table */ +#define VM_CHECK_FREE_VARIABLES 1 /* Check free variable access */ +#define VM_PUSH_DEBUG_FRAMES 0 /* Push frames onto the evaluator debug stack */ +#elif (VM_ENGINE == SCM_VM_DEBUG_ENGINE) +#define VM_USE_HOOKS 1 +#define VM_USE_CLOCK 1 +#define VM_CHECK_OBJECT 1 +#define VM_CHECK_FREE_VARIABLES 1 +#define VM_PUSH_DEBUG_FRAMES 1 +#else +#error unknown debug engine VM_ENGINE +#endif + +#include "vm-engine.h" + + +static SCM +VM_NAME (struct scm_vm *vp, SCM program, SCM *argv, int nargs) +{ + /* VM registers */ + register scm_t_uint8 *ip IP_REG; /* instruction pointer */ + register SCM *sp SP_REG; /* stack pointer */ + register SCM *fp FP_REG; /* frame pointer */ + + /* Cache variables */ + struct scm_objcode *bp = NULL; /* program base pointer */ + SCM *free_vars = NULL; /* free variables */ + size_t free_vars_count = 0; /* length of FREE_VARS */ + SCM *objects = NULL; /* constant objects */ + size_t object_count = 0; /* length of OBJECTS */ + SCM *stack_base = vp->stack_base; /* stack base address */ + SCM *stack_limit = vp->stack_limit; /* stack limit address */ + + /* Internal variables */ + int nvalues = 0; + long start_time = scm_c_get_internal_run_time (); + SCM finish_args; /* used both for returns: both in error + and normal situations */ +#if VM_USE_HOOKS + SCM hook_args = SCM_EOL; +#endif + +#ifdef HAVE_LABELS_AS_VALUES + static void **jump_table = NULL; +#endif + +#if VM_PUSH_DEBUG_FRAMES + scm_t_debug_frame debug; + scm_t_debug_info debug_vect_body; + debug.status = SCM_VOIDFRAME; +#endif + +#ifdef HAVE_LABELS_AS_VALUES + if (SCM_UNLIKELY (!jump_table)) + { + int i; + jump_table = malloc (SCM_VM_NUM_INSTRUCTIONS * sizeof(void*)); + for (i = 0; i < SCM_VM_NUM_INSTRUCTIONS; i++) + jump_table[i] = &&vm_error_bad_instruction; +#define VM_INSTRUCTION_TO_LABEL 1 +#include <libguile/vm-expand.h> +#include <libguile/vm-i-system.i> +#include <libguile/vm-i-scheme.i> +#include <libguile/vm-i-loader.i> +#undef VM_INSTRUCTION_TO_LABEL + } +#endif + + /* Initialization */ + { + SCM prog = program; + + /* Boot program */ + program = vm_make_boot_program (nargs); + +#if VM_PUSH_DEBUG_FRAMES + debug.prev = scm_i_last_debug_frame (); + debug.status = SCM_APPLYFRAME; + debug.vect = &debug_vect_body; + debug.vect[0].a.proc = program; /* the boot program */ + debug.vect[0].a.args = SCM_EOL; + scm_i_set_last_debug_frame (&debug); +#endif + + /* Initial frame */ + CACHE_REGISTER (); + PUSH ((SCM)fp); /* dynamic link */ + PUSH (0); /* ra */ + PUSH (0); /* mvra */ + CACHE_PROGRAM (); + PUSH (program); + fp = sp + 1; + INIT_FRAME (); + /* MV-call frame, function & arguments */ + PUSH ((SCM)fp); /* dynamic link */ + PUSH (0); /* ra */ + PUSH (0); /* mvra */ + PUSH (prog); + if (SCM_UNLIKELY (sp + nargs >= stack_limit)) + goto vm_error_too_many_args; + while (nargs--) + PUSH (*argv++); + } + + /* Let's go! */ + BOOT_HOOK (); + NEXT; + +#ifndef HAVE_LABELS_AS_VALUES + vm_start: + switch ((*ip++) & SCM_VM_INSTRUCTION_MASK) { +#endif + +#include "vm-expand.h" +#include "vm-i-system.c" +#include "vm-i-scheme.c" +#include "vm-i-loader.c" + +#ifndef HAVE_LABELS_AS_VALUES + default: + goto vm_error_bad_instruction; + } +#endif + + + vm_done: + SYNC_ALL (); +#if VM_PUSH_DEBUG_FRAMES + scm_i_set_last_debug_frame (debug.prev); +#endif + return finish_args; + + /* Errors */ + { + SCM err_msg; + + vm_error_bad_instruction: + err_msg = scm_from_locale_string ("VM: Bad instruction: ~s"); + finish_args = scm_list_1 (scm_from_uchar (ip[-1])); + goto vm_error; + + vm_error_unbound: + err_msg = scm_from_locale_string ("VM: Unbound variable: ~s"); + goto vm_error; + + vm_error_wrong_type_arg: + err_msg = scm_from_locale_string ("VM: Wrong type argument"); + finish_args = SCM_EOL; + goto vm_error; + + vm_error_too_many_args: + err_msg = scm_from_locale_string ("VM: Too many arguments"); + finish_args = scm_list_1 (scm_from_int (nargs)); + goto vm_error; + + vm_error_wrong_num_args: + /* nargs and program are valid */ + SYNC_ALL (); + scm_wrong_num_args (program); + /* shouldn't get here */ + goto vm_error; + + vm_error_wrong_type_apply: + SYNC_ALL (); + scm_error (scm_misc_error_key, FUNC_NAME, "Wrong type to apply: ~S", + scm_list_1 (program), SCM_BOOL_F); + goto vm_error; + + vm_error_stack_overflow: + err_msg = scm_from_locale_string ("VM: Stack overflow"); + finish_args = SCM_EOL; + goto vm_error; + + vm_error_stack_underflow: + err_msg = scm_from_locale_string ("VM: Stack underflow"); + finish_args = SCM_EOL; + goto vm_error; + + vm_error_improper_list: + err_msg = scm_from_locale_string ("Expected a proper list, but got object with tail ~s"); + goto vm_error; + + vm_error_not_a_pair: + SYNC_ALL (); + scm_wrong_type_arg_msg (FUNC_NAME, 1, finish_args, "pair"); + /* shouldn't get here */ + goto vm_error; + + vm_error_not_a_bytevector: + SYNC_ALL (); + scm_wrong_type_arg_msg (FUNC_NAME, 1, finish_args, "bytevector"); + /* shouldn't get here */ + goto vm_error; + + vm_error_no_values: + err_msg = scm_from_locale_string ("Zero values returned to single-valued continuation"); + finish_args = SCM_EOL; + goto vm_error; + + vm_error_not_enough_values: + err_msg = scm_from_locale_string ("Too few values returned to continuation"); + finish_args = SCM_EOL; + goto vm_error; + + vm_error_bad_wide_string_length: + err_msg = scm_from_locale_string ("VM: Bad wide string length: ~S"); + goto vm_error; + +#if VM_CHECK_IP + vm_error_invalid_address: + err_msg = scm_from_locale_string ("VM: Invalid program address"); + finish_args = SCM_EOL; + goto vm_error; +#endif + +#if VM_CHECK_OBJECT + vm_error_object: + err_msg = scm_from_locale_string ("VM: Invalid object table access"); + finish_args = SCM_EOL; + goto vm_error; +#endif + +#if VM_CHECK_FREE_VARIABLES + vm_error_free_variable: + err_msg = scm_from_locale_string ("VM: Invalid free variable access"); + finish_args = SCM_EOL; + goto vm_error; +#endif + + vm_error: + SYNC_ALL (); + + scm_ithrow (sym_vm_error, scm_list_3 (sym_vm_run, err_msg, finish_args), + 1); + } + + abort (); /* never reached */ +} + +#undef VM_USE_HOOKS +#undef VM_USE_CLOCK +#undef VM_CHECK_OBJECT +#undef VM_CHECK_FREE_VARIABLE +#undef VM_PUSH_DEBUG_FRAMES + +/* + Local Variables: + c-file-style: "gnu" + End: +*/ |