From 896d2c6f7b906ab46f18c98da58c5d1e3537532f Mon Sep 17 00:00:00 2001
From: Laborratte5 <laborratte5@gmail.com>
Date: Sun, 21 Jul 2024 11:25:07 +0200
Subject: [PATCH] feat(runtime): Implement add sub mult and div opcodes

Implement calculation of add sub mult and div operations
---
 runtime/BinCmdMap.h  |  10 ++++
 runtime/Makefile     |   2 +-
 runtime/salruntime.c | 111 ++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 121 insertions(+), 2 deletions(-)
 create mode 100644 runtime/BinCmdMap.h

diff --git a/runtime/BinCmdMap.h b/runtime/BinCmdMap.h
new file mode 100644
index 0000000..fc1f287
--- /dev/null
+++ b/runtime/BinCmdMap.h
@@ -0,0 +1,10 @@
+#ifndef BIN_CMD_MAP
+#define BIN_CMD_MAP
+
+#define CMD_CONST 0x0001
+#define CMD_ADD   0x0004
+#define CMD_SUB   0x0005
+#define CMD_MULT  0x0006
+#define CMD_DIV   0x0007
+
+#endif
diff --git a/runtime/Makefile b/runtime/Makefile
index f39f16c..2e3e598 100644
--- a/runtime/Makefile
+++ b/runtime/Makefile
@@ -1,6 +1,6 @@
 CC=gcc
 CFLAGS=-I.
-DEPS=OperandStack.h
+DEPS=OperandStack.h BinCmdMap
 OBJ=OperandStack.o salruntime.o
 
 %.o: %.c $(DEPS)
diff --git a/runtime/salruntime.c b/runtime/salruntime.c
index 608663e..181ebaa 100644
--- a/runtime/salruntime.c
+++ b/runtime/salruntime.c
@@ -1,7 +1,116 @@
 
 #include <stdio.h>
+#include <stdint.h>
+#include "BinCmdMap.h"
+#include "OperandStack.h"
+
+void runV1Program(FILE* program);
+void add(OperandStack* stack);
+void sub(OperandStack* stack);
+void mult(OperandStack* stack);
+void div(OperandStack* stack);
 
 int main() {
-    printf("Hello, world!");
+    FILE* program = fopen("./test.bin", "r");
+    if (program == NULL) {
+        // TODO: check for errors (e.g. file not found)
+        return -1;
+    }
+
+    uint8_t version;
+    size_t nread = fread(&version, 1, 1, program);
+
+    switch (version) {
+        case 1:
+            runV1Program(program);
+            break;
+        default:
+            printf("Unkown binary version: %i.\n \
+                    Probably the program was compiled with a more recent \
+                    version.", version);
+    }
+
+    fclose(program);
     return 0;
 }
+
+void runV1Program(FILE* program) {
+    OperandStack stack = {};
+    uint8_t opcode;
+
+    while (fread(&opcode, sizeof(opcode), 1, program) == 1) {
+
+        switch (opcode) {
+            case CMD_CONST:
+                int32_t val;
+                fread(&val, sizeof(int32_t), 1, program);
+                // TODO: check for errors
+                OStackPush(&stack, val);
+                break;
+            case CMD_ADD:
+                add(&stack);
+                break;
+            case CMD_SUB:
+                sub(&stack);
+                break;
+            case CMD_MULT:
+                mult(&stack);
+                break;
+            case CMD_DIV:
+                div(&stack);
+                break;
+            default:
+                printf("Unkown command");
+        }
+    }
+    // TODO check for errors
+    // (feof(program) == 0);
+
+    int result;
+    OStackPop(&stack, &result);
+    printf("%i\n", result);
+}
+
+void add(OperandStack* stack) {
+    int operandA;
+    int operandB;
+
+    OStackPop(stack, &operandA);
+    OStackPop(stack, &operandB);
+
+    int result = operandA + operandB;
+    OStackPush(stack, result);
+}
+
+void sub(OperandStack* stack) {
+    int operandA;
+    int operandB;
+
+    OStackPop(stack, &operandA);
+    OStackPop(stack, &operandB);
+
+    int result = operandA - operandB;
+    OStackPush(stack, result);
+}
+
+void mult(OperandStack* stack) {
+    int operandA;
+    int operandB;
+
+    OStackPop(stack, &operandA);
+    OStackPop(stack, &operandB);
+
+    int result = operandA * operandB;
+    OStackPush(stack, result);
+}
+
+void div(OperandStack* stack) {
+    int operandA;
+    int operandB;
+
+    OStackPop(stack, &operandA);
+    OStackPop(stack, &operandB);
+
+    int result = operandA / operandB;
+    OStackPush(stack, result);
+}