86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
// Copyright 2021 Bradley D. Nelson
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifdef HAS_SIGNALS
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#include <setjmp.h>
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#include <signal.h>
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#endif
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#define JMPW goto **(void **) w
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#define NEXT w = *ip++; JMPW
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#define ADDROF(x) (&& OP_ ## x)
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#ifdef HAS_SIGNALS
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static __thread jmp_buf g_forth_fault;
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static __thread int g_forth_signal;
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static void forth_signal_handler(int sig) {
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g_forth_signal = sig;
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sigset_t ss;
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sigemptyset(&ss);
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sigprocmask(SIG_SETMASK, &ss, 0);
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longjmp(g_forth_fault, 1);
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}
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#endif
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static cell_t *forth_run(cell_t *init_rp) {
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static const BUILTIN_WORD builtins[] = {
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#define Z(flags, name, op, code) \
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name, ((VOC_ ## flags >> 8) & 0xff) | BUILTIN_MARK, \
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sizeof(name) - 1, (VOC_ ## flags & 0xff), && OP_ ## op,
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PLATFORM_OPCODE_LIST
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TIER2_OPCODE_LIST
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TIER1_OPCODE_LIST
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TIER0_OPCODE_LIST
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#undef Z
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0, 0, 0, 0, 0,
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};
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if (!init_rp) {
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g_sys->DOCREATE_OP = ADDROF(DOCREATE);
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g_sys->builtins = builtins;
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#ifdef HAS_SIGNALS
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struct sigaction sa;
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memset(&sa, 0, sizeof(sa));
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sa.sa_handler = forth_signal_handler;
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sigaction(SIGSEGV, &sa, 0);
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sigaction(SIGBUS, &sa, 0);
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sigaction(SIGINT, &sa, 0);
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sigaction(SIGFPE, &sa, 0);
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#endif
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return 0;
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}
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register cell_t *ip, *rp, *sp, tos, w;
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register float *fp, ft;
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rp = init_rp; UNPARK;
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#ifdef HAS_SIGNALS
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if (setjmp(g_forth_fault)) {
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rp = *g_sys->throw_handler;
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*g_sys->throw_handler = (cell_t *) *rp--;
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sp = (cell_t *) *rp--;
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fp = (float *) *rp--;
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ip = (cell_t *) *rp--;
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--sp;
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tos = -g_forth_signal;
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}
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#endif
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NEXT;
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#define Z(flags, name, op, code) OP_ ## op: { code; } NEXT;
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PLATFORM_OPCODE_LIST
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TIER2_OPCODE_LIST
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TIER1_OPCODE_LIST
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TIER0_OPCODE_LIST
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#undef Z
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}
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