adding opcodes and results

src/Runtime.zig

@@ -1,5 +1,6 @@
 const std = @import("std");
 const spv = @import("spv.zig");
+const op = @import("opcodes.zig");
 
 const SpvVoid = spv.SpvVoid;
 const SpvByte = spv.SpvByte;
@@ -7,35 +8,36 @@ const SpvWord = spv.SpvWord;
 const SpvBool = spv.SpvBool;
 
 const Module = @import("Module.zig");
+const Result = @import("Result.zig");
 const WordIterator = @import("WordIterator.zig");
 
 const Self = @This();
 
-pub const CallError = error{
+pub const RuntimeError = error{
+    InvalidSpirV,
+    OutOfMemory,
     Unreachable,
     Killed,
-    Error,
-    InitEnd,
-    ExecEnd,
 };
 
-module: *Module,
+mod: *Module,
 it: WordIterator,
-stack_frames: std.SinglyLinkedList,
 
-pub fn init(module: *Module) !Self {
-    return .{
-        .module = module,
+current_function: ?*Result,
+
+pub fn init(module: *Module) Self {
+    return std.mem.zeroInit(Self, .{
+        .mod = module,
         .it = module.it,
-        .stack_frames = .{},
-    };
+        .current_function = null,
+    });
 }
 
 pub fn deinit(self: *const Self) void {
     _ = self;
 }
 
-pub fn callEntryPoint(self: *Self, entry: SpvWord) CallError!void {
+pub fn callEntryPoint(self: *Self, entry: SpvWord) RuntimeError!void {
     _ = self;
     _ = entry;
 }