adding real runtime

example/main.zig

@@ -13,10 +13,13 @@ pub fn main() !void {
         var module = try spv.Module.init(allocator, @ptrCast(@alignCast(shader_source)));
         defer module.deinit(allocator);
 
-        var rt = spv.Runtime.init(&module);
-        defer rt.deinit();
+        var rt = try spv.Runtime.init(allocator, &module);
+        defer rt.deinit(allocator);
 
-        try rt.callEntryPoint(0);
+        try rt.callEntryPoint(allocator, try rt.getEntryPointByName("main"));
+        var output: [4]f32 = undefined;
+        try rt.readOutput(f32, output[0..output.len], try rt.getResultByName("color"));
+        std.log.info("Result: Vec4[{d}, {d}, {d}, {d}]", .{ output[0], output[1], output[2], output[3] });
     }
     std.log.info("Successfully executed", .{});
 }

src/Module.zig

@@ -4,8 +4,6 @@ const lib = @import("lib.zig");
 const spv = @import("spv.zig");
 const op = @import("opcodes.zig");
 
-const pretty = @import("pretty");
-
 const SpvVoid = spv.SpvVoid;
 const SpvByte = spv.SpvByte;
 const SpvWord = spv.SpvWord;
@@ -60,7 +58,7 @@ memory_model: spv.SpvMemoryModel,
 files: std.ArrayList(SpvSource),
 extensions: std.ArrayList([]const u8),
 
-results: std.ArrayList(Result),
+results: []Result,
 
 entry_points: std.ArrayList(SpvEntryPoint),
 capabilities: std.EnumSet(spv.SpvCapability),
@@ -74,9 +72,9 @@ geometry_output_count: SpvWord,
 geometry_input: SpvWord,
 geometry_output: SpvWord,
 
-input_locations: std.AutoHashMap(SpvWord, *Value),
-output_locations: std.AutoHashMap(SpvWord, *Value),
-bindings: std.AutoHashMap(SpvBinding, *Value),
+input_locations: std.AutoHashMap(SpvWord, []Value),
+output_locations: std.AutoHashMap(SpvWord, []Value),
+bindings: std.AutoHashMap(SpvBinding, []Value),
 push_constants: []Value,
 
 pub fn init(allocator: std.mem.Allocator, source: []const SpvWord) ModuleError!Self {
@@ -84,15 +82,14 @@ pub fn init(allocator: std.mem.Allocator, source: []const SpvWord) ModuleError!S
         .code = allocator.dupe(SpvWord, source) catch return ModuleError.OutOfMemory,
         .files = std.ArrayList(SpvSource).empty,
         .extensions = std.ArrayList([]const u8).empty,
-        .results = std.ArrayList(Result).empty,
         .entry_points = std.ArrayList(SpvEntryPoint).empty,
         .capabilities = std.EnumSet(spv.SpvCapability).initEmpty(),
         .local_size_x = 1,
         .local_size_y = 1,
         .local_size_z = 1,
-        .input_locations = std.AutoHashMap(SpvWord, *Value).init(allocator),
-        .output_locations = std.AutoHashMap(SpvWord, *Value).init(allocator),
-        .bindings = std.AutoHashMap(SpvBinding, *Value).init(allocator),
+        .input_locations = std.AutoHashMap(SpvWord, []Value).init(allocator),
+        .output_locations = std.AutoHashMap(SpvWord, []Value).init(allocator),
+        .bindings = std.AutoHashMap(SpvBinding, []Value).init(allocator),
     });
     errdefer self.deinit(allocator);
 
@@ -115,18 +112,15 @@ pub fn init(allocator: std.mem.Allocator, source: []const SpvWord) ModuleError!S
     self.generator_version = @intCast(generator & 0x0000FFFF);
 
     self.bound = self.it.next() catch return ModuleError.InvalidSpirV;
-    self.results.resize(allocator, self.bound) catch return ModuleError.OutOfMemory;
-    for (self.results.items) |*result| {
+    self.results = allocator.alloc(Result, self.bound) catch return ModuleError.OutOfMemory;
+    for (self.results) |*result| {
         result.* = Result.init();
     }
 
     _ = self.it.skip(); // Skip schema
 
-    const prepassOps = std.EnumSet(spv.SpvOp).initMany(&[_]spv.SpvOp{
-        spv.SpvOp.Name,
-    });
-    try self.pass(allocator, prepassOps); // Pre-pass
-    try self.pass(allocator, prepassOps.complement()); // Setup pass
+    try self.pass(allocator); // Setup pass
+    try self.populateMaps();
 
     if (std.process.hasEnvVarConstant("SPIRV_INTERPRETER_DEBUG_LOGS")) {
         var capability_set_names: std.ArrayList([]const u8) = .empty;
@@ -166,7 +160,7 @@ pub fn init(allocator: std.mem.Allocator, source: []const SpvWord) ModuleError!S
             entry_points,
         });
 
-        pretty.print(allocator, self.results, .{ .tab_size = 4, .max_depth = 0 }) catch return ModuleError.OutOfMemory;
+        //@import("pretty").print(allocator, self.results, .{ .tab_size = 4, .max_depth = 0 }) catch return ModuleError.OutOfMemory;
     }
 
     return self;
@@ -183,19 +177,18 @@ fn checkEndiannessFromSpvMagic(magic: SpvWord) bool {
     return false;
 }
 
-fn pass(self: *Self, allocator: std.mem.Allocator, opcodes: std.EnumSet(spv.SpvOp)) ModuleError!void {
-    var rt = Runtime.init(self);
-    defer rt.deinit();
+fn pass(self: *Self, allocator: std.mem.Allocator) ModuleError!void {
+    var rt = Runtime.init(allocator, self) catch return ModuleError.OutOfMemory;
+    defer rt.deinit(allocator);
+
     while (rt.it.nextOrNull()) |opcode_data| {
         const word_count = ((opcode_data & (~spv.SpvOpCodeMask)) >> spv.SpvWordCountShift) - 1;
         const opcode = (opcode_data & spv.SpvOpCodeMask);
 
         var it_tmp = rt.it; // Save because operations may iter on this iterator
         if (std.enums.fromInt(spv.SpvOp, opcode)) |spv_op| {
-            if (opcodes.contains(spv_op)) {
-                if (op.SetupDispatcher.get(spv_op)) |pfn| {
-                    pfn(allocator, word_count, &rt) catch return ModuleError.InvalidSpirV;
-                }
+            if (op.SetupDispatcher.get(spv_op)) |pfn| {
+                pfn(allocator, word_count, &rt) catch return ModuleError.InvalidSpirV;
             }
         }
         _ = it_tmp.skipN(word_count);
@@ -203,6 +196,20 @@ fn pass(self: *Self, allocator: std.mem.Allocator, opcodes: std.EnumSet(spv.SpvO
     }
 }
 
+fn populateMaps(self: *Self) ModuleError!void {
+    for (self.results, 0..) |result, id| {
+        if (result.variant == null or std.meta.activeTag(result.variant.?) != .Variable) continue;
+        const variable = result.variant.?.Variable;
+        switch (variable.storage_class) {
+            .Output => for (result.decorations.items) |decoration| switch (decoration.rtype) {
+                .Location => self.output_locations.put(@intCast(id), variable.values) catch return ModuleError.OutOfMemory,
+                else => {},
+            },
+            else => {},
+        }
+    }
+}
+
 pub fn deinit(self: *Self, allocator: std.mem.Allocator) void {
     allocator.free(self.code);
     self.input_locations.deinit();
@@ -220,8 +227,8 @@ pub fn deinit(self: *Self, allocator: std.mem.Allocator) void {
     }
     self.extensions.deinit(allocator);
 
-    for (self.results.items) |*result| {
+    for (self.results) |*result| {
         result.deinit(allocator);
     }
-    self.results.deinit(allocator);
+    allocator.free(self.results);
 }

src/Result.zig

@@ -55,7 +55,7 @@ const Decoration = struct {
 };
 
 pub const Value = union(Type) {
-    Void,
+    Void: struct {},
     Bool: bool,
     Int: extern union {
         sint8: i8,
@@ -77,11 +77,11 @@ pub const Value = union(Type) {
     Array: struct {},
     RuntimeArray: struct {},
     Structure: []Value,
-    Function,
+    Function: struct {},
     Image: struct {},
     Sampler: struct {},
     SampledImage: struct {},
-    Pointer,
+    Pointer: struct {},
 
     fn initMembers(self: *Value, allocator: std.mem.Allocator, results: []const Self, target: SpvWord) RuntimeError!void {
         const resolved = results[target].resolveType(results);
@@ -91,16 +91,19 @@ pub const Value = union(Type) {
             .Type => |t| switch (t) {
                 .Bool, .Int, .Float => std.debug.assert(member_count == 1),
                 .Structure => |s| {
-                    _ = s;
-                    //self.Structure = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory;
-                    //for (self.Structure, s.members) |*value, member_id| {
-                    //    value.* = switch (results[member_id].variant.?.Type) { // wtf ?
-                    //        inline else => |tag| @unionInit(Value, @tagName(tag), undefined),
-                    //    };
-                    //}
+                    self.* = .{
+                        .Structure = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory,
+                    };
+                    for (self.Structure, s.members) |*value, member| {
+                        value.* = switch (member) {
+                            inline else => |tag| @unionInit(Value, @tagName(tag), undefined),
+                        };
+                    }
                 },
                 .Matrix => |m| {
-                    self.Matrix = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory;
+                    self.* = .{
+                        .Matrix = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory,
+                    };
                     for (self.Matrix) |*value| {
                         value.* = switch (m.column_type) {
                             inline else => |tag| @unionInit(Value, @tagName(tag), undefined),
@@ -111,7 +114,9 @@ pub const Value = union(Type) {
                     _ = a;
                 },
                 .Vector => |v| {
-                    self.Vector = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory;
+                    self.* = .{
+                        .Vector = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory,
+                    };
                     for (self.Vector) |*value| {
                         value.* = switch (v.components_type) {
                             inline else => |tag| @unionInit(Value, @tagName(tag), undefined),
@@ -123,47 +128,32 @@ pub const Value = union(Type) {
             else => {},
         }
     }
-};
 
-//void spvm_member_allocate_typed_value(spvm_member_t val, spvm_result* results, spvm_word type)
-//{
-//    spvm_result_t type_info = spvm_state_get_type_info(results, &results[type]);
-//    assert(type != 0);
-//
-//    if (type_info->value_type == spvm_value_type_void ||
-//                    type_info->value_type == spvm_value_type_int ||
-//                    type_info->value_type == spvm_value_type_float ||
-//                    type_info->value_type == spvm_value_type_bool) {
-//            assert(type_info->member_count == 1u);
-//    } else {
-//            spvm_member_allocate_value(val, type_info->member_count);
-//    }
-//
-//    val->type = type;
-//
-//    if (type_info->value_type == spvm_value_type_struct) {
-//            for (spvm_word i = 0; i < val->member_count; i++) {
-//                    spvm_member_allocate_typed_value(&val->members[i], results, type_info->params[i]);
-//            }
-//    }
-//    else if (type_info->value_type == spvm_value_type_matrix) {
-//            for (spvm_word i = 0; i < val->member_count; i++)
-//                    spvm_member_allocate_typed_value(&val->members[i], results, type_info->pointer);
-//    }
-//    else if (type_info->value_type == spvm_value_type_array) {
-//            if (results[type_info->pointer].member_count > 0)
-//                    for (spvm_word i = 0; i < val->member_count; i++)
-//                            spvm_member_allocate_typed_value(&val->members[i], results, type_info->pointer);
-//    } else if (type_info->value_type == spvm_value_type_vector) {
-//            for (spvm_word i = 0; i < val->member_count; ++i)
-//                    val->members[i].type = type_info->pointer;
-//    } else {
-//            // having nested images/samplers is not supported
-//            assert(type_info->value_type != spvm_value_type_sampled_image);
-//            assert(type_info->value_type != spvm_value_type_image);
-//            assert(type_info->value_type != spvm_value_type_sampler);
-//    }
-//}
+    /// Performs a deep copy
+    fn dupe(self: *const Value, allocator: std.mem.Allocator) RuntimeError!Value {
+        return switch (self.*) {
+            .Vector => |v| .{
+                .Vector = allocator.dupe(Value, v) catch return RuntimeError.OutOfMemory,
+            },
+            .Matrix => |m| .{
+                .Matrix = allocator.dupe(Value, m) catch return RuntimeError.OutOfMemory,
+            },
+            .Structure => |s| .{
+                .Structure = allocator.dupe(Value, s) catch return RuntimeError.OutOfMemory,
+            },
+            else => self.*,
+        };
+    }
+
+    fn deinit(self: *Value, allocator: std.mem.Allocator) void {
+        switch (self.*) {
+            .Structure => |values| allocator.free(values),
+            .Matrix => |values| allocator.free(values),
+            .Vector => |values| allocator.free(values),
+            else => {},
+        }
+    }
+};
 
 const Self = @This();
 
@@ -187,6 +177,7 @@ variant: ?union(Variant) {
             bit_length: SpvWord,
         },
         Vector: struct {
+            components_type_word: SpvWord,
             components_type: Type,
             member_count: SpvWord,
         },
@@ -198,10 +189,12 @@ variant: ?union(Variant) {
         Array: struct {},
         RuntimeArray: struct {},
         Structure: struct {
-            members: []const SpvWord,
+            members_type_word: []const SpvWord,
+            members: []Type,
             member_names: std.ArrayList([]const u8),
         },
         Function: struct {
+            source_location: usize,
             return_type: SpvWord,
             params: []const SpvWord,
         },
@@ -219,13 +212,19 @@ variant: ?union(Variant) {
     },
     Constant: []Value,
     Function: struct {
+        source_location: usize,
         return_type: SpvWord,
         function_type: SpvWord,
         params: []const SpvWord,
     },
-    AccessChain: struct {},
+    AccessChain: struct {
+        target: SpvWord,
+        values: []Value,
+    },
     FunctionParameter: struct {},
-    Label: struct {},
+    Label: struct {
+        source_location: usize,
+    },
 },
 
 pub fn init() Self {
@@ -246,6 +245,7 @@ pub fn deinit(self: *Self, allocator: std.mem.Allocator) void {
             .Type => |*t| switch (t.*) {
                 .Function => |data| allocator.free(data.params),
                 .Structure => |*data| {
+                    allocator.free(data.members_type_word);
                     allocator.free(data.members);
                     for (data.member_names.items) |name| {
                         allocator.free(name);
@@ -254,13 +254,97 @@ pub fn deinit(self: *Self, allocator: std.mem.Allocator) void {
                 },
                 else => {},
             },
-            .Constant => |values| allocator.free(values),
+            .Constant => |values| {
+                for (values) |*value| value.deinit(allocator);
+                allocator.free(values);
+            },
+            .Variable => |v| {
+                for (v.values) |*value| value.deinit(allocator);
+                allocator.free(v.values);
+            },
             else => {},
         }
     }
     self.decorations.deinit(allocator);
 }
 
+/// Performs a deep copy
+pub fn dupe(self: *const Self, allocator: std.mem.Allocator) RuntimeError!Self {
+    return .{
+        .name = if (self.name) |name| allocator.dupe(u8, name) catch return RuntimeError.OutOfMemory else null,
+        .decorations = self.decorations.clone(allocator) catch return RuntimeError.OutOfMemory,
+        .parent = self.parent,
+        .variant = blk: {
+            if (self.variant) |variant| {
+                switch (variant) {
+                    .String => |s| break :blk .{
+                        .String = allocator.dupe(u8, s) catch return RuntimeError.OutOfMemory,
+                    },
+                    .Type => |t| switch (t) {
+                        .Structure => |s| break :blk .{
+                            .Type = .{
+                                .Structure = .{
+                                    .members_type_word = allocator.dupe(SpvWord, s.members_type_word) catch return RuntimeError.OutOfMemory,
+                                    .members = allocator.dupe(Type, s.members) catch return RuntimeError.OutOfMemory,
+                                    .member_names = blk2: {
+                                        const member_names = s.member_names.clone(allocator) catch return RuntimeError.OutOfMemory;
+                                        for (member_names.items, s.member_names.items) |*new_name, name| {
+                                            new_name.* = allocator.dupe(u8, name) catch return RuntimeError.OutOfMemory;
+                                        }
+                                        break :blk2 member_names;
+                                    },
+                                },
+                            },
+                        },
+                        .Function => |f| break :blk .{
+                            .Type = .{
+                                .Function = .{
+                                    .source_location = f.source_location,
+                                    .return_type = f.return_type,
+                                    .params = allocator.dupe(SpvWord, f.params) catch return RuntimeError.OutOfMemory,
+                                },
+                            },
+                        },
+                        else => {},
+                    },
+                    .Variable => |v| break :blk .{
+                        .Variable = .{
+                            .storage_class = v.storage_class,
+                            .values = blk2: {
+                                const values = allocator.dupe(Value, v.values) catch return RuntimeError.OutOfMemory;
+                                for (values, v.values) |*new_value, value| {
+                                    new_value.* = try value.dupe(allocator);
+                                }
+                                break :blk2 values;
+                            },
+                        },
+                    },
+                    .Constant => |c| break :blk .{
+                        .Constant = blk2: {
+                            const values = allocator.dupe(Value, c) catch return RuntimeError.OutOfMemory;
+                            for (values, c) |*new_value, value| {
+                                new_value.* = try value.dupe(allocator);
+                            }
+                            break :blk2 values;
+                        },
+                    },
+                    .Function => |f| break :blk .{
+                        .Function = .{
+                            .source_location = f.source_location,
+                            .return_type = f.return_type,
+                            .function_type = f.function_type,
+                            .params = allocator.dupe(SpvWord, f.params) catch return RuntimeError.OutOfMemory,
+                        },
+                    },
+                    else => {},
+                }
+                break :blk variant;
+            }
+            break :blk null;
+        },
+    };
+}
+
 pub fn resolveType(self: *const Self, results: []const Self) *const Self {
     return if (self.variant) |variant|
         switch (variant) {
@@ -292,19 +376,7 @@ pub fn getMemberCounts(self: *const Self) usize {
     return 0;
 }
 
-pub fn initConstantValue(self: *Self, allocator: std.mem.Allocator, results: []const Self, target: SpvWord) RuntimeError!void {
-    const resolved = results[target].resolveType(results);
-    const member_count = resolved.getMemberCounts();
-
-    if (member_count == 0) return;
-
-    self.variant = .{ .Constant = allocator.alloc(Value, member_count) catch return RuntimeError.OutOfMemory };
-    errdefer switch (self.variant.?) {
-        .Constant => |c| allocator.free(c),
-        else => unreachable,
-    };
-    const values = self.variant.?.Constant;
-
+pub fn initValues(allocator: std.mem.Allocator, values: []Value, results: []const Self, resolved: *const Self) RuntimeError!void {
     switch (resolved.variant.?) {
         .Type => |t| switch (t) {
             .Bool => values[0] = .{ .Bool = undefined },
@@ -322,17 +394,17 @@ pub fn initConstantValue(self: *Self, allocator: std.mem.Allocator, results: []c
                     try value.initMembers(allocator, results, m.column_type_word);
                 }
             },
-            .Array => |a| {
+            .Array => |a| { // TODO
                 _ = a;
             },
             .Structure => |s| {
-                for (values, s.members) |*value, member_type| {
-                    try value.initMembers(allocator, results, member_type);
+                for (values, s.members_type_word) |*value, member_type_word| {
+                    try value.initMembers(allocator, results, member_type_word);
                 }
             },
-            .Image => {},
+            .Image => {}, // TODO
             .Sampler => {}, // No op
-            .SampledImage => {},
+            .SampledImage => {}, // TODO
             else => return RuntimeError.InvalidSpirV,
         },
         else => return RuntimeError.InvalidSpirV,

src/Runtime.zig

@@ -19,26 +19,157 @@ pub const RuntimeError = error{
     OutOfMemory,
     Unreachable,
     Killed,
+    InvalidEntryPoint,
+    ToDo,
+};
+
+pub const Function = struct {
+    source_location: usize,
+    result: *Result,
 };
 
 mod: *Module,
 it: WordIterator,
 
-current_function: ?*Result,
+/// Local deep copy of module's results to be able to run multiple runtimes concurrently
+results: []Result,
 
-pub fn init(module: *Module) Self {
-    return std.mem.zeroInit(Self, .{
+current_function: ?*Result,
+function_stack: std.ArrayList(Function),
+
+pub fn init(allocator: std.mem.Allocator, module: *Module) RuntimeError!Self {
+    return .{
         .mod = module,
         .it = module.it,
+        .results = blk: {
+            const results = allocator.dupe(Result, module.results) catch return RuntimeError.OutOfMemory;
+            for (results, module.results) |*new_result, result| {
+                new_result.* = result.dupe(allocator) catch return RuntimeError.OutOfMemory;
+            }
+            break :blk results;
+        },
         .current_function = null,
-    });
+        .function_stack = .empty,
+    };
 }
 
-pub fn deinit(self: *const Self) void {
-    _ = self;
+pub fn deinit(self: *Self, allocator: std.mem.Allocator) void {
+    for (self.results) |*result| {
+        result.deinit(allocator);
+    }
+    allocator.free(self.results);
+    self.function_stack.deinit(allocator);
 }
 
-pub fn callEntryPoint(self: *Self, entry: SpvWord) RuntimeError!void {
-    _ = self;
-    _ = entry;
+pub fn getEntryPointByName(self: *const Self, name: []const u8) error{NotFound}!SpvWord {
+    for (self.mod.entry_points.items, 0..) |entry_point, i| {
+        if (blk: {
+            // Not using std.mem.eql as entry point names may have longer size than their content
+            for (0..@min(name.len, entry_point.name.len)) |j| {
+                if (name[j] != entry_point.name[j]) break :blk false;
+            }
+            break :blk true;
+        }) return @intCast(i);
+    }
+    return error.NotFound;
+}
+
+pub fn getResultByName(self: *const Self, name: []const u8) error{NotFound}!SpvWord {
+    for (self.results, 0..) |result, i| {
+        if (result.name) |result_name| {
+            if (blk: {
+                // Same as entry points
+                for (0..@min(name.len, result_name.len)) |j| {
+                    if (name[j] != result_name[j]) break :blk false;
+                }
+                break :blk true;
+            }) return @intCast(i);
+        }
+    }
+    return error.NotFound;
+}
+
+/// Calls an entry point, `entry_point_index` being the index of the entry point ordered by declaration in the bytecode
+pub fn callEntryPoint(self: *Self, allocator: std.mem.Allocator, entry_point_index: SpvWord) RuntimeError!void {
+    self.reset();
+
+    if (entry_point_index > self.mod.entry_points.items.len) return RuntimeError.InvalidEntryPoint;
+
+    {
+        const entry_point_desc = &self.mod.entry_points.items[entry_point_index];
+        const entry_point_result = &self.mod.results[entry_point_desc.id];
+        if (entry_point_result.variant) |variant| {
+            switch (variant) {
+                .Function => |f| {
+                    if (!self.it.jumpToSourceLocation(f.source_location)) return RuntimeError.InvalidEntryPoint;
+                },
+                else => return RuntimeError.InvalidEntryPoint,
+            }
+        } else {
+            return RuntimeError.InvalidEntryPoint;
+        }
+    }
+
+    while (self.it.nextOrNull()) |opcode_data| {
+        const word_count = ((opcode_data & (~spv.SpvOpCodeMask)) >> spv.SpvWordCountShift) - 1;
+        const opcode = (opcode_data & spv.SpvOpCodeMask);
+
+        var it_tmp = self.it; // Save because operations may iter on this iterator
+        if (std.enums.fromInt(spv.SpvOp, opcode)) |spv_op| {
+            if (op.RuntimeDispatcher.get(spv_op)) |pfn| {
+                try pfn(allocator, word_count, self);
+            }
+        }
+        _ = it_tmp.skipN(word_count);
+        self.it = it_tmp;
+    }
+}
+
+pub fn readOutput(self: *const Self, comptime T: type, output: []T, result: SpvWord) error{NotFound}!void {
+    if (self.mod.output_locations.get(result)) |out| {
+        self.readValue(T, output, &out[0]);
+    } else {
+        return error.NotFound;
+    }
+}
+
+fn reset(self: *Self) void {
+    self.function_stack.clearRetainingCapacity();
+    self.current_function = null;
+}
+
+fn readValue(self: *const Self, comptime T: type, output: []T, value: *const Result.Value) void {
+    switch (value.*) {
+        .Bool => |b| {
+            if (T == bool) {
+                output[0] = b;
+            }
+        },
+        .Int => |i| {
+            switch (T) {
+                i8 => output[0] = i.sint8,
+                i16 => output[0] = i.sint16,
+                i32 => output[0] = i.sint32,
+                i64 => output[0] = i.sint64,
+                u8 => output[0] = i.uint8,
+                u16 => output[0] = i.uint16,
+                u32 => output[0] = i.uint32,
+                u64 => output[0] = i.uint64,
+                inline else => unreachable,
+            }
+        },
+        .Float => |f| {
+            switch (T) {
+                f16 => output[0] = f.float16,
+                f32 => output[0] = f.float32,
+                f64 => output[0] = f.float64,
+                inline else => unreachable,
+            }
+        },
+        .Vector => |values| for (values, 0..) |v, i| self.readValue(T, output[i..], &v),
+        .Matrix => |values| for (values, 0..) |v, i| self.readValue(T, output[i..], &v),
+        .Array => unreachable, // TODO
+        .Structure => |values| for (values, 0..) |v, i| self.readValue(T, output[i..], &v),
+        else => unreachable,
+    }
 }

src/WordIterator.zig

@@ -54,3 +54,17 @@ pub fn skipN(self: *Self, count: usize) bool {
     self.index += count;
     return true;
 }
+
+pub fn skipToEnd(self: *Self) void {
+    self.index = self.buffer.len;
+}
+
+pub inline fn emitSourceLocation(self: *const Self) usize {
+    return self.index;
+}
+
+pub inline fn jumpToSourceLocation(self: *Self, source_location: usize) bool {
+    if (source_location > self.buffer.len) return false;
+    self.index = source_location;
+    return true;
+}

src/opcodes.zig

@@ -13,25 +13,22 @@ const SpvByte = spv.SpvByte;
 const SpvWord = spv.SpvWord;
 const SpvBool = spv.SpvBool;
 
-// DUMB INDEV OPCODES TODO :
-//     OpVariable           X
-//     OpAccessChain        X
-//     OpStore              X
-//     OpLoad               X
-//     OpCompositeExtract   X
-//     OpReturn             X
-//     OpFunctionEnd        X
-
 pub const OpCodeFunc = *const fn (std.mem.Allocator, SpvWord, *Runtime) RuntimeError!void;
 
 pub const SetupDispatcher = block: {
     @setEvalBranchQuota(65535);
     break :block std.EnumMap(spv.SpvOp, OpCodeFunc).init(.{
         .Capability = opCapability,
+        .CompositeConstruct = opCompositeConstruct,
+        .CompositeExtract = opCompositeExtract,
         .Constant = opConstant,
         .Decorate = opDecorate,
         .EntryPoint = opEntryPoint,
         .ExecutionMode = opExecutionMode,
+        .Function = opFunction,
+        .FunctionEnd = opFunctionEnd,
+        .Label = opLabel,
+        .Load = opLoadSetup,
         .MemberDecorate = opDecorateMember,
         .MemberName = opMemberName,
         .MemoryModel = opMemoryModel,
@@ -48,9 +45,16 @@ pub const SetupDispatcher = block: {
         .TypeVector = opTypeVector,
         .TypeVoid = opTypeVoid,
         .Variable = opVariable,
-        .Function = opFunction,
-        .Label = opLabel,
-        .CompositeConstruct = opCompositeConstruct,
+    });
+};
+
+pub const RuntimeDispatcher = block: {
+    @setEvalBranchQuota(65535);
+    break :block std.EnumMap(spv.SpvOp, OpCodeFunc).init(.{
+        .AccessChain = opAccessChain,
+        .Load = opLoad,
+        .Return = opReturn,
+        .Store = opStore,
     });
 };
 
@@ -59,7 +63,7 @@ fn opCapability(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!voi
 }
 
 fn addDecoration(allocator: std.mem.Allocator, rt: *Runtime, target: SpvWord, decoration_type: spv.SpvDecoration, member: ?SpvWord) RuntimeError!void {
-    var decoration = rt.mod.results.items[target].decorations.addOne(allocator) catch return RuntimeError.OutOfMemory;
+    var decoration = rt.mod.results[target].decorations.addOne(allocator) catch return RuntimeError.OutOfMemory;
     decoration.rtype = decoration_type;
     decoration.index = if (member) |memb| memb else 0;
 
@@ -155,12 +159,13 @@ fn opMemberName(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime)
     const id = try rt.it.next();
     const memb = try rt.it.next();
 
-    var result = &rt.mod.results.items[id];
+    var result = &rt.mod.results[id];
 
     if (result.variant == null) {
         result.variant = .{
             .Type = .{
                 .Structure = .{
+                    .members_type_word = undefined,
                     .members = undefined,
                     .member_names = .empty,
                 },
@@ -190,8 +195,8 @@ fn opMemoryModel(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!vo
 
 fn opName(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    if (id >= rt.mod.results.items.len) return RuntimeError.InvalidSpirV;
-    var result = &rt.mod.results.items[id];
+    if (id >= rt.mod.results.len) return RuntimeError.InvalidSpirV;
+    var result = &rt.mod.results[id];
     result.* = Result.init();
     result.name = try readStringN(allocator, &rt.it, word_count - 1);
 }
@@ -202,15 +207,15 @@ fn opSource(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) Run
     file.lang_version = try rt.it.next();
     if (word_count > 2) {
         const id = try rt.it.next();
-        if (id >= rt.mod.results.items.len) return RuntimeError.InvalidSpirV;
-        if (rt.mod.results.items[id].name) |name| {
+        if (id >= rt.mod.results.len) return RuntimeError.InvalidSpirV;
+        if (rt.mod.results[id].name) |name| {
             file.file_name = name;
         }
     }
     if (word_count > 3) {
         const id = try rt.it.next();
-        if (id >= rt.mod.results.items.len) return RuntimeError.InvalidSpirV;
-        if (rt.mod.results.items[id].name) |name| {
+        if (id >= rt.mod.results.len) return RuntimeError.InvalidSpirV;
+        if (rt.mod.results[id].name) |name| {
             file.source = name;
         }
     }
@@ -222,7 +227,7 @@ fn opSourceExtension(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Run
 
 fn opTypeVoid(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Void = .{},
         },
@@ -231,7 +236,7 @@ fn opTypeVoid(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void
 
 fn opTypeBool(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Bool = .{},
         },
@@ -240,7 +245,7 @@ fn opTypeBool(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void
 
 fn opTypeInt(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Int = .{
                 .bit_length = try rt.it.next(),
@@ -252,7 +257,7 @@ fn opTypeInt(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
 
 fn opTypeFloat(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Float = .{
                 .bit_length = try rt.it.next(),
@@ -263,10 +268,12 @@ fn opTypeFloat(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void
 
 fn opTypeVector(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    const components_type_word = try rt.it.next();
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Vector = .{
-                .components_type = switch (rt.mod.results.items[try rt.it.next()].variant.?) {
+                .components_type_word = components_type_word,
+                .components_type = switch (rt.mod.results[components_type_word].variant.?) {
                     .Type => |t| @as(Result.Type, t),
                     else => return RuntimeError.InvalidSpirV,
                 },
@@ -279,11 +286,11 @@ fn opTypeVector(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!voi
 fn opTypeMatrix(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
     const column_type_word = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Matrix = .{
                 .column_type_word = column_type_word,
-                .column_type = switch (rt.mod.results.items[column_type_word].variant.?) {
+                .column_type = switch (rt.mod.results[column_type_word].variant.?) {
                     .Type => |t| @as(Result.Type, t),
                     else => return RuntimeError.InvalidSpirV,
                 },
@@ -295,7 +302,7 @@ fn opTypeMatrix(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!voi
 
 fn opTypePointer(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Pointer = .{
                 .storage_class = try rt.it.nextAs(spv.SpvStorageClass),
@@ -307,27 +314,36 @@ fn opTypePointer(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!vo
 
 fn opTypeStruct(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    const members = blk: {
-        const members = allocator.alloc(SpvWord, word_count - 1) catch return RuntimeError.OutOfMemory;
+    const members_type_word, const members = blk: {
+        const members_type_word = allocator.alloc(SpvWord, word_count - 1) catch return RuntimeError.OutOfMemory;
+        errdefer allocator.free(members_type_word);
+
+        const members = allocator.alloc(Result.Type, word_count - 1) catch return RuntimeError.OutOfMemory;
         errdefer allocator.free(members);
-        for (members) |*member| {
-            member.* = try rt.it.next();
+
+        for (members_type_word, members) |*member_type_word, *member| {
+            member_type_word.* = try rt.it.next();
+            member.* = rt.mod.results[member_type_word.*].variant.?.Type;
         }
-        break :blk members;
+        break :blk .{ members_type_word, members };
     };
 
-    if (rt.mod.results.items[id].variant) |*variant| {
+    if (rt.mod.results[id].variant) |*variant| {
         switch (variant.*) {
             .Type => |*t| switch (t.*) {
-                .Structure => |*s| s.members = members,
+                .Structure => |*s| {
+                    s.members_type_word = members_type_word;
+                    s.members = members;
+                },
                 else => unreachable,
             },
             else => unreachable,
         }
     } else {
-        rt.mod.results.items[id].variant = .{
+        rt.mod.results[id].variant = .{
             .Type = .{
                 .Structure = .{
+                    .members_type_word = members_type_word,
                     .members = members,
                     .member_names = .empty,
                 },
@@ -338,9 +354,10 @@ fn opTypeStruct(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime)
 
 fn opTypeFunction(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
+    rt.mod.results[id].variant = .{
         .Type = .{
             .Function = .{
+                .source_location = 0,
                 .return_type = try rt.it.next(),
                 .params = blk: {
                     const params = allocator.alloc(SpvWord, word_count - 2) catch return RuntimeError.OutOfMemory;
@@ -356,12 +373,7 @@ fn opTypeFunction(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtim
 }
 
 fn opConstant(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
-    const var_type = try rt.it.next();
-    const id = try rt.it.next();
-
-    const target = &rt.mod.results.items[id];
-    try target.initConstantValue(allocator, rt.mod.results.items, var_type);
-
+    const target = try setupConstant(allocator, rt);
     // No check on null and sizes, absolute trust in this shit
     switch (target.variant.?.Constant[0]) {
         .Int => |*i| {
@@ -382,26 +394,29 @@ fn opConstant(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) R
     }
 }
 
-fn opVariable(_: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
+fn opVariable(allocator: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
     const var_type = try rt.it.next();
     const id = try rt.it.next();
     const storage_class = try rt.it.nextAs(spv.SpvStorageClass);
     const initializer: ?SpvWord = if (word_count >= 4) try rt.it.next() else null;
-    _ = var_type;
-    _ = id;
-    _ = storage_class;
-    _ = initializer;
 
-    //rt.mod.results.items[id].variant = .{
-    //    .Variable = .{
-    //        .storage_class = storage_class,
-    //        .value = value: {
-    //            const resolved = rt.mod.results.items[var_type].resolveType(rt.mod.results.items);
-    //            _ = resolved;
-    //            break :value undefined;
-    //        },
-    //    },
-    //};
+    const target = &rt.mod.results[id];
+
+    const resolved = rt.mod.results[var_type].resolveType(rt.mod.results);
+    const member_count = resolved.getMemberCounts();
+    if (member_count == 0) {
+        return RuntimeError.InvalidSpirV;
+    }
+    target.variant = .{
+        .Variable = .{
+            .storage_class = storage_class,
+            .values = allocator.alloc(Result.Value, member_count) catch return RuntimeError.OutOfMemory,
+        },
+    };
+    errdefer allocator.free(target.variant.?.Variable.values);
+    try Result.initValues(allocator, target.variant.?.Variable.values, rt.mod.results, resolved);
+
+    _ = initializer;
 }
 
 fn opFunction(allocator: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
@@ -410,12 +425,15 @@ fn opFunction(allocator: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeErr
     _ = rt.it.skip(); // Skip function control
     const function_type_id = try rt.it.next();
 
-    rt.mod.results.items[id].variant = .{
+    const source_location = rt.it.emitSourceLocation();
+
+    rt.mod.results[id].variant = .{
         .Function = .{
+            .source_location = source_location,
             .return_type = return_type,
             .function_type = function_type_id,
             .params = params: {
-                if (rt.mod.results.items[function_type_id].variant) |variant| {
+                if (rt.mod.results[function_type_id].variant) |variant| {
                     const params_count = switch (variant) {
                         .Type => |t| switch (t) {
                             .Function => |f| f.params.len,
@@ -430,30 +448,167 @@ fn opFunction(allocator: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeErr
         },
     };
 
-    rt.current_function = &rt.mod.results.items[id];
+    rt.mod.results[function_type_id].variant.?.Type.Function.source_location = source_location;
+
+    rt.current_function = &rt.mod.results[id];
 }
 
 fn opLabel(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
     const id = try rt.it.next();
-    rt.mod.results.items[id].variant = .{
-        .Label = .{},
+    rt.mod.results[id].variant = .{
+        .Label = .{
+            .source_location = rt.it.emitSourceLocation() - 2, // Original label location
+        },
     };
 }
 
-fn opCompositeConstruct(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
-    _ = rt;
+fn opCompositeConstruct(allocator: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    _ = try setupConstant(allocator, rt);
+}
+
+fn opCompositeExtract(allocator: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    _ = try setupConstant(allocator, rt);
+}
+
+fn opFunctionEnd(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    rt.current_function = null;
+}
+
+fn opAccessChain(_: std.mem.Allocator, word_count: SpvWord, rt: *Runtime) RuntimeError!void {
+    const var_type = try rt.it.next();
+    const id = try rt.it.next();
+    const base_id = try rt.it.next();
+
+    const target = &rt.results[id];
+
+    target.variant = .{
+        .AccessChain = .{
+            .target = var_type,
+            .values = undefined,
+        },
+    };
+
+    const base = &rt.results[base_id];
+    const values = blk: {
+        if (base.variant) |variant| {
+            switch (variant) {
+                .Variable => |v| break :blk v.values,
+                else => {},
+            }
+        }
+        return RuntimeError.InvalidSpirV;
+    };
+    var value_ptr = &values[0];
+
+    const index_count = word_count - 4;
+    for (0..index_count) |_| {
+        const member = &rt.results[try rt.it.next()];
+        const member_value = switch (member.variant orelse return RuntimeError.InvalidSpirV) {
+            .Constant => |c| &c[0],
+            else => return RuntimeError.InvalidSpirV,
+        };
+        switch (member_value.*) {
+            .Int => |i| {
+                if (i.uint32 > values.len) return RuntimeError.InvalidSpirV;
+                value_ptr = switch (value_ptr.*) {
+                    .Vector => |v| &v[i.uint32],
+                    .Matrix => |m| &m[i.uint32],
+                    .Array => |_| return RuntimeError.ToDo,
+                    .Structure => |s| &s[i.uint32],
+                    else => return RuntimeError.InvalidSpirV,
+                };
+            },
+            else => return RuntimeError.InvalidSpirV,
+        }
+    }
+    target.variant.?.AccessChain.values = switch (value_ptr.*) {
+        .Vector => |v| v,
+        .Matrix => |m| m,
+        .Array => |_| return RuntimeError.ToDo,
+        .Structure => |s| s,
+        else => @as([*]Result.Value, @ptrCast(value_ptr))[0..1],
+    };
+}
+
+fn opStore(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    const ptr_id = try rt.it.next();
+    const val_id = try rt.it.next();
+    copyValues(
+        switch (rt.results[ptr_id].variant orelse return RuntimeError.InvalidSpirV) {
+            .Variable => |v| v.values,
+            .Constant => |c| c,
+            .AccessChain => |a| a.values,
+            else => return RuntimeError.InvalidSpirV,
+        },
+        switch (rt.results[val_id].variant orelse return RuntimeError.InvalidSpirV) {
+            .Variable => |v| v.values,
+            .Constant => |c| c,
+            .AccessChain => |a| a.values,
+            else => return RuntimeError.InvalidSpirV,
+        },
+    );
+}
+
+fn opLoadSetup(allocator: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    _ = try setupConstant(allocator, rt);
+}
+
+fn opLoad(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    _ = rt.it.skip();
+    const id = try rt.it.next();
+    const ptr_id = try rt.it.next();
+    copyValues(
+        switch (rt.results[id].variant orelse return RuntimeError.InvalidSpirV) {
+            .Variable => |v| v.values,
+            .Constant => |c| c,
+            .AccessChain => |a| a.values,
+            else => return RuntimeError.InvalidSpirV,
+        },
+        switch (rt.results[ptr_id].variant orelse return RuntimeError.InvalidSpirV) {
+            .Variable => |v| v.values,
+            .Constant => |c| c,
+            .AccessChain => |a| a.values,
+            else => return RuntimeError.InvalidSpirV,
+        },
+    );
+}
+
+fn opReturn(_: std.mem.Allocator, _: SpvWord, rt: *Runtime) RuntimeError!void {
+    _ = rt.function_stack.pop();
+    if (rt.function_stack.getLastOrNull()) |function| {
+        _ = rt.it.jumpToSourceLocation(function.source_location);
+        rt.current_function = function.result;
+    } else {
+        rt.current_function = null;
+        rt.it.skipToEnd();
+    }
+}
+
+inline fn setupConstant(allocator: std.mem.Allocator, rt: *Runtime) RuntimeError!*Result {
+    const res_type = try rt.it.next();
+    const id = try rt.it.next();
+    const target = &rt.mod.results[id];
+
+    const resolved = rt.mod.results[res_type].resolveType(rt.mod.results);
+    const member_count = resolved.getMemberCounts();
+    if (member_count == 0) {
+        return RuntimeError.InvalidSpirV;
+    }
+    target.variant = .{ .Constant = allocator.alloc(Result.Value, member_count) catch return RuntimeError.OutOfMemory };
+    errdefer allocator.free(target.variant.?.Constant);
+    try Result.initValues(allocator, target.variant.?.Constant, rt.mod.results, resolved);
+    return target;
 }
 
 fn readString(allocator: std.mem.Allocator, it: *WordIterator) RuntimeError![]const u8 {
     var str: std.ArrayList(u8) = .empty;
     while (it.nextOrNull()) |word| {
+        if (word == 0) break;
         (str.addOne(allocator) catch return RuntimeError.OutOfMemory).* = @truncate(word & 0x000000FF);
         (str.addOne(allocator) catch return RuntimeError.OutOfMemory).* = @truncate((word & 0x0000FF00) >> 8);
         (str.addOne(allocator) catch return RuntimeError.OutOfMemory).* = @truncate((word & 0x00FF0000) >> 16);
         (str.addOne(allocator) catch return RuntimeError.OutOfMemory).* = @truncate((word & 0xFF000000) >> 24);
-        if (str.getLast() == 0) {
-            break;
-        }
+        if (str.getLast() == 0) break;
     }
     return str.toOwnedSlice(allocator);
 }
@@ -462,14 +617,29 @@ fn readStringN(allocator: std.mem.Allocator, it: *WordIterator, n: usize) Runtim
     var str = std.ArrayList(u8).initCapacity(allocator, n * 4) catch return RuntimeError.OutOfMemory;
     for (0..n) |_| {
         if (it.nextOrNull()) |word| {
+            if (word == 0) break;
             str.addOneAssumeCapacity().* = @truncate(word & 0x000000FF);
             str.addOneAssumeCapacity().* = @truncate((word & 0x0000FF00) >> 8);
             str.addOneAssumeCapacity().* = @truncate((word & 0x00FF0000) >> 16);
             str.addOneAssumeCapacity().* = @truncate((word & 0xFF000000) >> 24);
-            if (str.getLast() == 0) {
-                break;
-            }
+            if (str.getLast() == 0) break;
         }
     }
     return str.toOwnedSlice(allocator);
 }
+
+fn copyValue(dst: *Result.Value, src: *const Result.Value) void {
+    switch (src.*) {
+        .Vector => |v| copyValues(dst.Vector, v),
+        .Matrix => |m| copyValues(dst.Matrix, m),
+        .Array => |_| unreachable,
+        .Structure => |s| copyValues(dst.Structure, s),
+        else => dst.* = src.*,
+    }
+}
+
+inline fn copyValues(dst: []Result.Value, src: []const Result.Value) void {
+    for (dst, src) |*d, *s| {
+        copyValue(d, s);
+    }
+}