60 lines
1.7 KiB
C
60 lines
1.7 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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#define NEXT goto next
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#define JMPW goto work
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#define ADDR_DOCOLON ((void *) OP_DOCOLON)
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#define ADDR_DOCREATE ((void *) OP_DOCREATE)
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#define ADDR_DODOES ((void *) OP_DODOES)
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enum {
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OP_DOCOLON = 0,
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OP_DOCREATE,
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OP_DODOES,
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#define X(name, op, code) OP_ ## op,
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PLATFORM_OPCODE_LIST
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OPCODE_LIST
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#undef X
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};
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static cell_t *forth_run(cell_t *init_rp) {
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if (!init_rp) {
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#define X(name, op, code) \
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create(name, sizeof(name) - 1, name[0] == ';', (void *) OP_ ## op);
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PLATFORM_OPCODE_LIST
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OPCODE_LIST
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#undef X
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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;
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rp = init_rp; UNPARK;
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for (;;) {
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next:
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w = *ip++;
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work:
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switch (*(cell_t *) w & 0xff) {
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#define X(name, op, code) case OP_ ## op: { code; } NEXT;
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PLATFORM_OPCODE_LIST
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OPCODE_LIST
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#undef X
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case OP_DOCOLON: ++rp; *rp = (cell_t) ip; ip = (cell_t *) (w + sizeof(cell_t)); NEXT;
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case OP_DOCREATE: DUP; tos = w + sizeof(cell_t) * 2; NEXT;
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case OP_DODOES: DUP; tos = w + sizeof(cell_t) * 2;
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++rp; *rp = (cell_t) ip;
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ip = (cell_t *) *(cell_t *) (w + sizeof(cell_t)); NEXT;
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}
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}
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}
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