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checker: check errors of cast to byte (#12961)

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yuyi 2021-12-25 17:34:15 +08:00 committed by GitHub
parent d0ad79cd8b
commit 8764a3a973
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7 changed files with 53 additions and 31 deletions
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13
vlib/v/checker/checker.v
View File

@ -3487,10 +3487,6 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
c.error('cannot convert type `$from_type_sym.name` to `$to_type_sym.name` (alias to `$to_type_sym_final.name`)',
node.pos)
}
} else if to_type_sym.kind == .byte && from_type_sym.kind == .alias
&& from_type_sym_final.kind != .byte && !from_type.is_ptr() {
type_name := c.table.type_to_str(from_type)
c.error('cannot cast type `$type_name` to `byte`', node.pos)
} else if to_type_sym.kind == .struct_ && !to_type.is_ptr()
&& !(to_type_sym.info as ast.Struct).is_typedef {
// For now we ignore C typedef because of `C.Window(C.None)` in vlib/clipboard
@ -3523,10 +3519,13 @@ pub fn (mut c Checker) cast_expr(mut node ast.CastExpr) ast.Type {
if (to_type.is_ptr() || to_type_sym.kind !in [.sum_type, .interface_]) && !c.is_builtin_mod {
from_type_name := c.table.type_to_str(from_type)
type_name := c.table.type_to_str(to_type)
snexpr := node.expr.str()
c.error('cannot cast struct `$from_type_name` to `$type_name`, use `${snexpr}.str()` instead.',
node.pos)
c.error('cannot cast struct `$from_type_name` to `$type_name`', node.pos)
}
} else if to_type_sym.kind == .byte && !from_type_sym_final.is_number()
&& !from_type_sym_final.is_pointer() && !from_type.is_ptr()
&& from_type_sym_final.kind !in [.char, .enum_, .bool] {
type_name := c.table.type_to_str(from_type)
c.error('cannot cast type `$type_name` to `byte`', node.pos)
} else if from_type.has_flag(.optional) || from_type.has_flag(.variadic) {
// variadic case can happen when arrays are converted into variadic
msg := if from_type.has_flag(.optional) { 'an optional' } else { 'a variadic' }

7
vlib/v/checker/tests/cast_alias_to_byte_err.out
View File

@ -1,7 +0,0 @@
vlib/v/checker/tests/cast_alias_to_byte_err.vv:5:7: error: cannot cast type `Foo` to `byte`
3 | fn main() {
4 | a := Foo('hello')
5 | b := byte(a)
| ~~~~~~~
6 | println(b)
7 | }

7
vlib/v/checker/tests/cast_alias_to_byte_err.vv
View File

@ -1,7 +0,0 @@
type Foo = string
fn main() {
a := Foo('hello')
b := byte(a)
println(b)
}

2
vlib/v/checker/tests/cast_string_err.out
View File

@ -12,7 +12,7 @@ vlib/v/checker/tests/cast_string_err.vv:18:9: error: cannot cast sumtype `Sumtyp
| ~~~~~~~~~~
19 | println(sst)
20 | //
vlib/v/checker/tests/cast_string_err.vv:22:10: error: cannot cast struct `Abc` to `string`, use `abc.str()` instead.
vlib/v/checker/tests/cast_string_err.vv:22:10: error: cannot cast struct `Abc` to `string`
20 | //
21 | abc := Abc{}
22 | sabc := string(abc)

14
vlib/v/checker/tests/cast_to_byte_err.out Normal file
View File

@ -0,0 +1,14 @@
vlib/v/checker/tests/cast_to_byte_err.vv:10:7: error: cannot cast type `string` to `byte`
8 | fn main() {
9 | // should be errors:
10 | _ := byte('hello')
| ~~~~~~~~~~~~~
11 | _ := byte(SAlias('hello'))
12 |
vlib/v/checker/tests/cast_to_byte_err.vv:11:7: error: cannot cast type `SAlias` to `byte`
9 | // should be errors:
10 | _ := byte('hello')
11 | _ := byte(SAlias('hello'))
| ~~~~~~~~~~~~~~~~~~~~~
12 |
13 | // should be allowed:

23
vlib/v/checker/tests/cast_to_byte_err.vv Normal file
View File

@ -0,0 +1,23 @@
type SAlias = string
type CAlias = char
type IAlias = int
type UAlias = u32
type FAlias = f32
fn main() {
// should be errors:
_ := byte('hello')
_ := byte(SAlias('hello'))
// should be allowed:
_ := byte(char(1))
_ := byte(int(1))
_ := byte(u32(1))
_ := byte(f32(1.0))
_ := byte(CAlias(1))
_ := byte(IAlias(1))
_ := byte(UAlias(1))
_ := byte(FAlias(1))
}

18
vlib/v/checker/tests/struct_type_cast_err.out
View File

@ -1,60 +1,60 @@
vlib/v/checker/tests/struct_type_cast_err.vv:5:10: error: cannot cast struct `Foo` to `string`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:5:10: error: cannot cast struct `Foo` to `string`
3 | fn main() {
4 | foo := Foo{}
5 | _ := string(foo)
| ~~~~~~~~~~~
6 | _ := int(foo)
7 | _ := u64(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:6:10: error: cannot cast struct `Foo` to `int`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:6:10: error: cannot cast struct `Foo` to `int`
4 | foo := Foo{}
5 | _ := string(foo)
6 | _ := int(foo)
| ~~~~~~~~
7 | _ := u64(foo)
8 | _ := u32(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:7:10: error: cannot cast struct `Foo` to `u64`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:7:10: error: cannot cast struct `Foo` to `u64`
5 | _ := string(foo)
6 | _ := int(foo)
7 | _ := u64(foo)
| ~~~~~~~~
8 | _ := u32(foo)
9 | _ := rune(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:8:10: error: cannot cast struct `Foo` to `u32`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:8:10: error: cannot cast struct `Foo` to `u32`
6 | _ := int(foo)
7 | _ := u64(foo)
8 | _ := u32(foo)
| ~~~~~~~~
9 | _ := rune(foo)
10 | _ := byte(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:9:10: error: cannot cast struct `Foo` to `rune`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:9:10: error: cannot cast struct `Foo` to `rune`
7 | _ := u64(foo)
8 | _ := u32(foo)
9 | _ := rune(foo)
| ~~~~~~~~~
10 | _ := byte(foo)
11 | _ := i8(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:10:10: error: cannot cast struct `Foo` to `byte`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:10:10: error: cannot cast struct `Foo` to `byte`
8 | _ := u32(foo)
9 | _ := rune(foo)
10 | _ := byte(foo)
| ~~~~~~~~~
11 | _ := i8(foo)
12 | _ := i64(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:11:10: error: cannot cast struct `Foo` to `i8`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:11:10: error: cannot cast struct `Foo` to `i8`
9 | _ := rune(foo)
10 | _ := byte(foo)
11 | _ := i8(foo)
| ~~~~~~~
12 | _ := i64(foo)
13 | _ := int(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:12:10: error: cannot cast struct `Foo` to `i64`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:12:10: error: cannot cast struct `Foo` to `i64`
10 | _ := byte(foo)
11 | _ := i8(foo)
12 | _ := i64(foo)
| ~~~~~~~~
13 | _ := int(foo)
14 | _ = &I1(foo)
vlib/v/checker/tests/struct_type_cast_err.vv:13:10: error: cannot cast struct `Foo` to `int`, use `foo.str()` instead.
vlib/v/checker/tests/struct_type_cast_err.vv:13:10: error: cannot cast struct `Foo` to `int`
11 | _ := i8(foo)
12 | _ := i64(foo)
13 | _ := int(foo)