feat(runtime): Implement add sub mult and div opcodes

Implement calculation of add sub mult and div operations

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

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)

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);
+}