| 1 | const Mir = @This(); |
| 2 | const InternPool = @import("../../InternPool.zig"); |
| 3 | |
| 4 | const builtin = @import("builtin"); |
| 5 | const std = @import("std"); |
| 6 | const assert = std.debug.assert; |
| 7 | |
| 8 | instructions: std.MultiArrayList(Inst).Slice, |
| 9 | |
| 10 | extra: []const u32, |
| 11 | |
| 12 | pub const Inst = struct { |
| 13 | tag: Tag, |
| 14 | data: Data, |
| 15 | |
| 16 | /// The position of a given MIR isntruction with the instruction list. |
| 17 | pub const Index = enum(u32) { |
| 18 | _, |
| 19 | }; |
| 20 | |
| 21 | pub const Tag = enum(u8) { |
| 22 | /// imm8 |
| 23 | set_page_i = 0x04, |
| 24 | /// imm8 |
| 25 | set_addr_i = 0x09, |
| 26 | /// imm8 |
| 27 | load_i_outa = 0x15, |
| 28 | /// index |
| 29 | jump = 0x68, |
| 30 | /// nothing |
| 31 | halt = 0xE3, |
| 32 | }; |
| 33 | |
| 34 | /// All instructions contain a 4-byte payload, which is contained within |
| 35 | /// this union. `Tag` determines which union tag is active, as well as |
| 36 | /// how to interpret the data within. |
| 37 | pub const Data = union { |
| 38 | imm8: u8, |
| 39 | index: Index, |
| 40 | nothing: void, |
| 41 | |
| 42 | comptime { |
| 43 | switch (builtin.mode) { |
| 44 | .Debug, .ReleaseSafe => {}, |
| 45 | .ReleaseFast, .ReleaseSmall => assert(@sizeOf(Data) == 4), |
| 46 | } |
| 47 | } |
| 48 | }; |
| 49 | }; |
| 50 | |
| 51 | pub fn deinit(mir: *Mir, gpa: std.mem.Allocator) void { |
| 52 | mir.instructions.deinit(gpa); |
| 53 | mir.* = undefined; |
| 54 | } |