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Sema: allow coercing typed undefined to int

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Closes #13556
This commit is contained in:
Veikka Tuominen 2022-11-16 18:27:17 +02:00
parent e5a3eb9777
commit 0616d2966a
2 changed files with 24 additions and 4 deletions
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20
src/Sema.zig
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@ -24307,7 +24307,10 @@ fn coerceExtra(
},
.Int, .ComptimeInt => switch (inst_ty.zigTypeTag()) {
.Float, .ComptimeFloat => float: {
const val = (try sema.resolveDefinedValue(block, inst_src, inst)) orelse {
if (is_undef) {
return sema.addConstUndef(dest_ty);
}
const val = (try sema.resolveMaybeUndefVal(inst)) orelse {
if (dest_ty.zigTypeTag() == .ComptimeInt) {
if (!opts.report_err) return error.NotCoercible;
return sema.failWithNeededComptime(block, inst_src, "value being casted to 'comptime_int' must be comptime-known");
@ -24327,7 +24330,10 @@ fn coerceExtra(
return try sema.addConstant(dest_ty, result_val);
},
.Int, .ComptimeInt => {
if (try sema.resolveDefinedValue(block, inst_src, inst)) |val| {
if (is_undef) {
return sema.addConstUndef(dest_ty);
}
if (try sema.resolveMaybeUndefVal(inst)) |val| {
// comptime-known integer to other number
if (!(try sema.intFitsInType(val, dest_ty, null))) {
if (!opts.report_err) return error.NotCoercible;
@ -24364,7 +24370,10 @@ fn coerceExtra(
return try sema.addConstant(dest_ty, result_val);
},
.Float => {
if (try sema.resolveDefinedValue(block, inst_src, inst)) |val| {
if (is_undef) {
return sema.addConstUndef(dest_ty);
}
if (try sema.resolveMaybeUndefVal(inst)) |val| {
const result_val = try val.floatCast(sema.arena, dest_ty, target);
if (!val.eql(result_val, dest_ty, sema.mod)) {
return sema.fail(
@ -24389,7 +24398,10 @@ fn coerceExtra(
}
},
.Int, .ComptimeInt => int: {
const val = (try sema.resolveDefinedValue(block, inst_src, inst)) orelse {
if (is_undef) {
return sema.addConstUndef(dest_ty);
}
const val = (try sema.resolveMaybeUndefVal(inst)) orelse {
if (dest_ty.zigTypeTag() == .ComptimeFloat) {
if (!opts.report_err) return error.NotCoercible;
return sema.failWithNeededComptime(block, inst_src, "value being casted to 'comptime_float' must be comptime-known");

8
test/behavior/cast.zig
View File

@ -1429,3 +1429,11 @@ test "peer type resolution of function pointer and function body" {
try expect(@TypeOf(a, b) == *const fn () u32);
try expect(@TypeOf(b, a) == *const fn () u32);
}
test "cast typed undefined to int" {
comptime {
const a: u16 = undefined;
const b: u8 = a;
_ = b;
}
}