Merge pull request #7827 from Snektron/spirv-setup

Stage 2: SPIR-V setup

1 files changed, 51 insertions, 0 deletions

diff --git a/src/codegen/spirv.zig b/src/codegen/spirv.zig
new file mode 100644
index 0000000000..5a262de836
--- /dev/null
+++ b/src/codegen/spirv.zig
@@ -0,0 +1,51 @@
+const std = @import("std");
+const Allocator = std.mem.Allocator;
+
+const spec = @import("spirv/spec.zig");
+const Module = @import("../Module.zig");
+const Decl = Module.Decl;
+
+pub fn writeInstruction(code: *std.ArrayList(u32), instr: spec.Opcode, args: []const u32) !void {
+    const word_count = @intCast(u32, args.len + 1);
+    try code.append((word_count << 16) | @enumToInt(instr));
+    try code.appendSlice(args);
+}
+
+pub const SPIRVModule = struct {
+    next_id: u32 = 0,
+    free_id_list: std.ArrayList(u32),
+
+    pub fn init(allocator: *Allocator) SPIRVModule {
+        return .{
+            .free_id_list = std.ArrayList(u32).init(allocator),
+        };
+    }
+
+    pub fn deinit(self: *SPIRVModule) void {
+        self.free_id_list.deinit();
+    }
+
+    pub fn allocId(self: *SPIRVModule) u32 {
+        if (self.free_id_list.popOrNull()) |id| return id;
+
+        defer self.next_id += 1;
+        return self.next_id;
+    }
+
+    pub fn freeId(self: *SPIRVModule, id: u32) void {
+        if (id + 1 == self.next_id) {
+            self.next_id -= 1;
+        } else {
+            // If no more memory to append the id to the free list, just ignore it.
+            self.free_id_list.append(id) catch {};
+        }
+    }
+
+    pub fn idBound(self: *SPIRVModule) u32 {
+        return self.next_id;
+    }
+
+    pub fn genDecl(self: SPIRVModule, id: u32, code: *std.ArrayList(u32), decl: *Decl) !void {
+
+    }
+};