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delete packed enums from the language

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No need for any such thing. Instead, provide an integer tag type for the
enum.
This commit is contained in:
Andrew Kelley 2021-04-22 19:21:50 -07:00
parent 329a359974
commit 8dd7378013
2 changed files with 7 additions and 26 deletions
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21
doc/langref.html.in
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@ -2588,7 +2588,7 @@ test "default struct initialization fields" {
exactly their bit width.
</li>
<li>{#syntax#}bool{#endsyntax#} fields use exactly 1 bit.</li>
<li>A {#link|packed enum#} field uses exactly the bit width of its integer tag type.</li>
<li>An {#link|enum#} field uses exactly the bit width of its integer tag type.</li>
<li>A {#link|packed union#} field uses exactly the bit width of the union field with
the largest bit width.</li>
<li>Non-ABI-aligned fields are packed into the smallest possible
@ -2983,25 +2983,6 @@ export fn entry(foo: Foo) void { }
{#code_end#}
{#header_close#}
{#header_open|packed enum#}
<p>By default, the size of enums is not guaranteed.</p>
<p>{#syntax#}packed enum{#endsyntax#} causes the size of the enum to be the same as the size of the
integer tag type of the enum:</p>
{#code_begin|test#}
const std = @import("std");
test "packed enum" {
const Number = packed enum(u8) {
one,
two,
three,
};
std.testing.expect(@sizeOf(Number) == @sizeOf(u8));
}
{#code_end#}
<p>This makes the enum eligible to be in a {#link|packed struct#}.</p>
{#header_close#}
{#header_open|Enum Literals#}
<p>
Enum literals allow specifying the name of an enum field without specifying the enum type:

12
lib/std/os/linux/bpf.zig
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@ -398,10 +398,10 @@ pub const Insn = packed struct {
/// r0 - r9 are general purpose 64-bit registers, r10 points to the stack
/// frame
pub const Reg = packed enum(u4) { r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10 };
const Source = packed enum(u1) { reg, imm };
pub const Reg = enum(u4) { r0, r1, r2, r3, r4, r5, r6, r7, r8, r9, r10 };
const Source = enum(u1) { reg, imm };
const Mode = packed enum(u8) {
const Mode = enum(u8) {
imm = IMM,
abs = ABS,
ind = IND,
@ -410,7 +410,7 @@ pub const Insn = packed struct {
msh = MSH,
};
const AluOp = packed enum(u8) {
const AluOp = enum(u8) {
add = ADD,
sub = SUB,
mul = MUL,
@ -426,14 +426,14 @@ pub const Insn = packed struct {
arsh = ARSH,
};
pub const Size = packed enum(u8) {
pub const Size = enum(u8) {
byte = B,
half_word = H,
word = W,
double_word = DW,
};
const JmpOp = packed enum(u8) {
const JmpOp = enum(u8) {
ja = JA,
jeq = JEQ,
jgt = JGT,