| ... | ... | @@ -3,9 +3,12 @@ const Allocator = std.mem.Allocator; |
| 3 | 3 | const ArrayList = std.ArrayList; |
| 4 | 4 | const assert = std.debug.assert; |
| 5 | 5 | const leb = std.debug.leb; |
| 6 | const mem = std.mem; |
| 6 | 7 | |
| 7 | 8 | const Decl = @import("../Module.zig").Decl; |
| 9 | const Inst = @import("../ir.zig").Inst; |
| 8 | 10 | const Type = @import("../type.zig").Type; |
| 11 | const Value = @import("../value.zig").Value; |
| 9 | 12 | |
| 10 | 13 | fn genValtype(ty: Type) u8 { |
| 11 | 14 | return switch (ty.tag()) { |
| ... | ... | @@ -56,10 +59,10 @@ pub fn genCode(buf: *ArrayList(u8), decl: *Decl) !void { |
| 56 | 59 | try leb.writeULEB128(writer, @as(u32, 0)); |
| 57 | 60 | |
| 58 | 61 | // Write instructions |
| 59 | | |
| 60 | | // TODO: actually implement codegen |
| 61 | | try writer.writeByte(0x41); // i32.const |
| 62 | | try leb.writeILEB128(writer, @as(i32, 42)); |
| 62 | // TODO: check for and handle death of instructions |
| 63 | const tv = decl.typed_value.most_recent.typed_value; |
| 64 | const mod_fn = tv.val.cast(Value.Payload.Function).?.func; |
| 65 | for (mod_fn.analysis.success.instructions) |inst| try genInst(writer, inst); |
| 63 | 66 | |
| 64 | 67 | // Write 'end' opcode |
| 65 | 68 | try writer.writeByte(0x0B); |
| ... | ... | @@ -68,3 +71,49 @@ pub fn genCode(buf: *ArrayList(u8), decl: *Decl) !void { |
| 68 | 71 | // beginning of the buffer. |
| 69 | 72 | leb.writeUnsignedFixed(5, buf.items[0..5], @intCast(u32, buf.items.len - 5)); |
| 70 | 73 | } |
| 74 | |
| 75 | fn genInst(writer: ArrayList(u8).Writer, inst: *Inst) !void { |
| 76 | return switch (inst.tag) { |
| 77 | .dbg_stmt => {}, |
| 78 | .ret => genRet(writer, inst.castTag(.ret).?), |
| 79 | else => error.TODOImplementMoreWasmCodegen, |
| 80 | }; |
| 81 | } |
| 82 | |
| 83 | fn genRet(writer: ArrayList(u8).Writer, inst: *Inst.UnOp) !void { |
| 84 | switch (inst.operand.tag) { |
| 85 | .constant => { |
| 86 | const constant = inst.operand.castTag(.constant).?; |
| 87 | switch (inst.operand.ty.tag()) { |
| 88 | .u32 => { |
| 89 | try writer.writeByte(0x41); // i32.const |
| 90 | try leb.writeILEB128(writer, constant.val.toUnsignedInt()); |
| 91 | }, |
| 92 | .i32 => { |
| 93 | try writer.writeByte(0x41); // i32.const |
| 94 | try leb.writeILEB128(writer, constant.val.toSignedInt()); |
| 95 | }, |
| 96 | .u64 => { |
| 97 | try writer.writeByte(0x42); // i64.const |
| 98 | try leb.writeILEB128(writer, constant.val.toUnsignedInt()); |
| 99 | }, |
| 100 | .i64 => { |
| 101 | try writer.writeByte(0x42); // i64.const |
| 102 | try leb.writeILEB128(writer, constant.val.toSignedInt()); |
| 103 | }, |
| 104 | .f32 => { |
| 105 | try writer.writeByte(0x43); // f32.const |
| 106 | // TODO: enforce LE byte order |
| 107 | try writer.writeAll(mem.asBytes(&constant.val.toFloat(f32))); |
| 108 | }, |
| 109 | .f64 => { |
| 110 | try writer.writeByte(0x44); // f64.const |
| 111 | // TODO: enforce LE byte order |
| 112 | try writer.writeAll(mem.asBytes(&constant.val.toFloat(f64))); |
| 113 | }, |
| 114 | else => return error.TODOImplementMoreWasmCodegen, |
| 115 | } |
| 116 | }, |
| 117 | else => return error.TODOImplementMoreWasmCodegen, |
| 118 | } |
| 119 | } |
Isaac Freund <mail@isaacfreund.com> 2020-08-16 01:10:08+02:00