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stage2 cbe: errors

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This commit is contained in:
Veikka Tuominen
2021-01-29 18:20:35 +02:00
parent c22f010fdd
commit cfc19eace7
3 changed files with 54 additions and 0 deletions
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29
src/codegen/c.zig
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@@ -217,6 +217,11 @@ pub const DeclGen = struct {
try writer.writeAll(" }");
}
},
.ErrorSet => {
const payload = val.castTag(.@"error").?;
// error values will be #defined at the top of the file
return writer.print("zig_error_{s}", .{payload.data.name});
},
else => |e| return dg.fail(dg.decl.src(), "TODO: C backend: implement value {s}", .{
@tagName(e),
}),
@@ -327,6 +332,16 @@ pub const DeclGen = struct {
try dg.renderType(w, child_type);
try w.writeAll(" payload; bool is_null; }");
},
.ErrorSet => {
comptime std.debug.assert(Type.initTag(.anyerror).abiSize(std.Target.current) == 2);
try w.writeAll("uint16_t");
},
.ErrorUnion => {
// TODO this needs to be typedeffed since different structs are different types.
try w.writeAll("struct { ");
try dg.renderType(w, t.errorUnionChild());
try w.writeAll(" payload; uint16_t error; }");
},
.Null, .Undefined => unreachable, // must be const or comptime
else => |e| return dg.fail(dg.decl.src(), "TODO: C backend: implement type {s}", .{
@tagName(e),
@@ -464,6 +479,8 @@ pub fn genBody(o: *Object, body: ir.Body) error{ AnalysisFail, OutOfMemory }!voi
.wrap_optional => try genWrapOptional(o, inst.castTag(.wrap_optional).?),
.optional_payload => try genOptionalPayload(o, inst.castTag(.optional_payload).?),
.optional_payload_ptr => try genOptionalPayload(o, inst.castTag(.optional_payload).?),
.is_err => try genIsErr(o, inst.castTag(.is_err).?),
.is_err_ptr => try genIsErr(o, inst.castTag(.is_err_ptr).?),
else => |e| return o.dg.fail(o.dg.decl.src(), "TODO: C backend: implement codegen for {}", .{e}),
};
switch (result_value) {
@@ -900,6 +917,18 @@ fn genWrapOptional(o: *Object, inst: *Inst.UnOp) !CValue {
return local;
}
fn genIsErr(o: *Object, inst: *Inst.UnOp) !CValue {
const writer = o.writer();
const maybe_deref = if (inst.base.tag == .is_err_ptr) "[0]" else "";
const operand = try o.resolveInst(inst.operand);
const local = try o.allocLocal(Type.initTag(.bool), .Const);
try writer.writeAll(" = (");
try o.writeCValue(writer, operand);
try writer.print("){s}.error != 0;\n", .{maybe_deref});
return local;
}
fn IndentWriter(comptime UnderlyingWriter: type) type {
return struct {
const Self = @This();