Meg's Mirrors

zig

1	const std = @import("std");
2	const Allocator = std.mem.Allocator;
3	const assert = std.debug.assert;
4	const Interner = @import("../../Interner.zig");
5	const Ir = @import("../../Ir.zig");
6	const BaseRenderer = Ir.Renderer;
7	const zig = @import("zig");
8	const abi = zig.arch.x86_64.abi;
9	const bits = zig.arch.x86_64.bits;
10
11	const Condition = bits.Condition;
12	const Immediate = bits.Immediate;
13	const Memory = bits.Memory;
14	const Register = bits.Register;
15	const RegisterLock = RegisterManager.RegisterLock;
16	const FrameIndex = bits.FrameIndex;
17
18	const RegisterManager = zig.RegisterManager(Renderer, Register, Ir.Ref, abi.allocatable_regs);
19
20	// Register classes
21	const RegisterBitSet = RegisterManager.RegisterBitSet;
22	const RegisterClass = struct {
23	const gp: RegisterBitSet = blk: {
24	var set: RegisterBitSet = .empty;
25	for (abi.allocatable_regs, 0..) |reg, index| if (reg.class() == .general_purpose) set.set(index);
26	break :blk set;
27	};
28	const x87: RegisterBitSet = blk: {
29	var set: RegisterBitSet = .empty;
30	for (abi.allocatable_regs, 0..) |reg, index| if (reg.class() == .x87) set.set(index);
31	break :blk set;
32	};
33	const sse: RegisterBitSet = blk: {
34	var set: RegisterBitSet = .empty;
35	for (abi.allocatable_regs, 0..) |reg, index| if (reg.class() == .sse) set.set(index);
36	break :blk set;
37	};
38	};
39
40	const Renderer = @This();
41
42	base: *BaseRenderer,
43	interner: *Interner,
44
45	register_manager: RegisterManager = .{},
46
47	pub fn render(base: *BaseRenderer) !void {
48	var renderer: Renderer = .{
49	.base = base,
50	.interner = base.ir.interner,
51	};
52
53	for (renderer.base.ir.decls.keys(), renderer.base.ir.decls.values()) |name, decl| {
54	renderer.renderFn(name, decl) catch |e| switch (e) {
55	error.OutOfMemory => return e,
56	error.LowerFail => continue,
57	};
58	}
59	if (renderer.base.errors.entries.len != 0) return error.LowerFail;
60	}
61
62	fn renderFn(r: *Renderer, name: []const u8, decl: Ir.Decl) !void {
63	_ = decl;
64	return r.base.fail(name, "TODO implement lowering functions", .{});
65	}