From: bylex <mbilek06@gmail.com>
Date: Wed, 2 Oct 2024 06:07:46 +0000 (+0200)
Subject: Add basic assembler code
X-Git-Url: https://git.bylex.cz/?a=commitdiff_plain;h=680802b20b3c26a0f51df502e1f87502e0fe9d60;p=maturita.git

Add basic assembler code

Assembler is still work in progress
---

diff --git a/Makefile b/Makefile
index 6a6f3b3..db9300c 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,7 @@
+CFLAGS = -g -w -O0
+
 all: int ass
+
 int: 
 	$(CC) $(CFLAGS) interpreter.c -o interpreter
 ass:
diff --git a/assembler.c b/assembler.c
new file mode 100644
index 0000000..09bc341
--- /dev/null
+++ b/assembler.c
@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#include "assembler.h"
+
+
+
+struct inst_t
+{
+	bool contains_instruction;
+	uint8_t instruction_code;
+	uint8_t params[3];
+} instruction_default = {false, 0, 0, 0, 0};
+
+void parse_line(FILE** input_file)
+{
+	char line_buffer[256];	
+
+	int token_count = 0;
+	char* token;
+	struct inst_t inst = instruction_default;
+
+	fgets(line_buffer, 256, *input_file);
+
+	if(line_buffer[0] == ';')
+	{
+		return;
+	}
+	else
+	{
+		inst.contains_instruction = true;
+	}
+	
+	token = strtok(line_buffer, " ");
+	while(token)
+	{
+		switch(token_count)
+		{
+			case 0:
+				// current token is instruction code
+				uint8_t i = 0;
+				while(i < N_INSTRUCTIONS - 1)
+				{
+					if(strcmp(token, opcodes_strings[i]) == 0)
+					{
+						inst.instruction_code = i;
+						break;
+					}
+					i++;
+				}
+				break;
+			case 1:
+				// current token is first parameter
+				inst.params[0] = (uint8_t)atoi(token);
+				break;
+			case 2: 
+				// current token is second parameter
+				uint16_t token_int = atoi(token);
+				inst.params[1] = token_int;
+				break;
+			case 3: 
+				// current token is third parameter
+				break;
+		}
+		token_count++;
+		token = strtok(NULL, " ");
+	}
+}
+
+int main(int argc, char *argv[])
+{
+
+	if(argc <= 2 || argc >= 4)
+	{
+		printf("Usage: %s <input file> <output file>\n", argv[0]);
+		return 1;
+	}
+	
+	FILE* input_file = fopen(argv[1], "r");
+	if(!input_file)
+	{
+		perror("Cannot open input file for reading\n");
+		return 1;
+	}
+
+	FILE* output_file = fopen(argv[2], "w");
+	if(!output_file)
+	{
+		perror("Cannot open output file for writing\n");
+		return 1;
+	}
+	while(!feof(input_file))
+	{
+		parse_line(&input_file);
+	}
+}
diff --git a/assembler.h b/assembler.h
new file mode 100644
index 0000000..22714f8
--- /dev/null
+++ b/assembler.h
@@ -0,0 +1,3 @@
+#include "common.h"
+
+char opcodes_strings[N_INSTRUCTIONS][4] = {"nop", "inc", "dec", "lod", "ldl", "sav", "swp", "jmp", "jez", "hlt", "pts", "pfs"};
diff --git a/common.h b/common.h
new file mode 100644
index 0000000..cd94b24
--- /dev/null
+++ b/common.h
@@ -0,0 +1 @@
+#define N_INSTRUCTIONS 12