155 lines
2.8 KiB
C
155 lines
2.8 KiB
C
/* main.c
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* Created: 2023-09-02
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* Author: Aryadev Chavali
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* Description: Entrypoint of compiler
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "./lib.h"
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#include "./parser.h"
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#define MEMORY_DEFAULT 30000
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#define DEBUG 0
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#define MIN_MEM_DUMP 64
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typedef struct
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{
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size_t dp;
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uint8_t memory[MEMORY_DEFAULT];
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#if DEBUG
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size_t dp_max;
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#endif
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} machine_t;
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void interpret(machine_t *cpu, node_t *ast, size_t num)
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{
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for (size_t i = 0; i < num; ++i)
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{
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node_t node = ast[i];
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switch (node.type)
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{
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case NEXT:
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++cpu->dp;
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break;
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case PREV:
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--cpu->dp;
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break;
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case INC:
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++cpu->memory[cpu->dp];
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break;
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case DEC:
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--cpu->memory[cpu->dp];
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break;
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case OUT:
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putchar(cpu->memory[cpu->dp]);
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break;
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case READ:
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cpu->memory[cpu->dp] = getchar();
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break;
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case LIN:
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if (cpu->memory[cpu->dp] == 0)
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i = node.loop_ref;
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break;
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case LOUT:
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if (cpu->memory[cpu->dp] != 0)
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i = node.loop_ref;
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break;
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}
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#if DEBUG
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if (cpu->dp > cpu->dp_max)
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cpu->dp_max = cpu->dp + 1;
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#endif
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}
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#if DEBUG
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if (cpu->dp_max < MIN_MEM_DUMP)
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cpu->dp_max = MIN_MEM_DUMP;
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#endif
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}
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int main(int argc, char *argv[])
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{
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if (argc == 1)
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{
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fprintf(
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stderr,
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"Usage: %s [FILE]...\nReads FILES sequentially on the same machine\n",
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argv[0]);
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return 1;
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}
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char *filepath, *file_data;
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buffer_t *buffer;
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struct PResult res;
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machine_t machine = {0};
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for (int i = 1; i < argc; ++i)
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{
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filepath = argv[i];
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FILE *handle = fopen(filepath, "r");
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#if DEBUG
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printf("[DEBUG]: Attempting to open file handle to %s\n", filepath);
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#endif
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if (!handle)
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{
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fprintf(stderr, "ERROR: Could not open \"%s\"\n", filepath);
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goto error;
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}
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file_data = fread_all(handle);
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fclose(handle);
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#if DEBUG
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printf("[DEBUG]: Read data from file %s\n", filepath);
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#endif
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buffer = buffer_init_str(filepath, file_data, strlen(file_data));
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#if DEBUG
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puts("[DEBUG]: Initialised buffer");
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#endif
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res = parse_buffer(buffer);
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if (res.nodes == NULL)
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{
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fputs("Exiting early...\n", stderr);
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goto error;
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}
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#if DEBUG
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char *str = ast_to_str(res.nodes, res.size);
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printf("[DEBUG]: Parsed buffer (%lu nodes parsed)\n\t[DEBUG]: Out=%s\n",
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res.size, str);
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free(str);
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#endif
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interpret(&machine, res.nodes, res.size);
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#if DEBUG
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printf("[DEBUG]: Finished interpreting, memory:");
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for (size_t i = 0; i < machine.dp_max; ++i)
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{
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if (i % 8 == 0)
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printf("\n\t");
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printf("%d ", machine.memory[i]);
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}
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#endif
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free(res.nodes);
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free(buffer);
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free(file_data);
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}
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return 0;
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error:
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if (buffer)
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free(buffer);
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if (res.nodes)
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free(res.nodes);
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return 1;
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}
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