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os.linux: some fixes to BPF module

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- For ALU operations, src should be allowed to be an explicit Reg.
- Expose AluOp and JmpOp as public types.
  This makes code generation using BPF as a backend easier,
  as AluOp and JmpOp can be used directly as part of an IR
This commit is contained in:
bfredl 2022-10-15 18:35:33 +02:00 committed by Andrew Kelley
parent b346d48572
commit c750d95417
1 changed files with 5 additions and 5 deletions
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10
lib/std/os/linux/bpf.zig
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@ -409,7 +409,7 @@ pub const Insn = packed struct {
msh = MSH,
};
const AluOp = enum(u8) {
pub const AluOp = enum(u8) {
add = ADD,
sub = SUB,
mul = MUL,
@ -432,7 +432,7 @@ pub const Insn = packed struct {
double_word = DW,
};
const JmpOp = enum(u8) {
pub const JmpOp = enum(u8) {
ja = JA,
jeq = JEQ,
jgt = JGT,
@ -453,7 +453,7 @@ pub const Insn = packed struct {
};
fn imm_reg(code: u8, dst: Reg, src: anytype, off: i16) Insn {
const imm_or_reg = if (@typeInfo(@TypeOf(src)) == .EnumLiteral)
const imm_or_reg = if (@TypeOf(src) == Reg or @typeInfo(@TypeOf(src)) == .EnumLiteral)
ImmOrReg{ .reg = @as(Reg, src) }
else
ImmOrReg{ .imm = src };
@ -478,7 +478,7 @@ pub const Insn = packed struct {
};
}
fn alu(comptime width: comptime_int, op: AluOp, dst: Reg, src: anytype) Insn {
pub fn alu(comptime width: comptime_int, op: AluOp, dst: Reg, src: anytype) Insn {
const width_bitfield = switch (width) {
32 => ALU,
64 => ALU64,
@ -540,7 +540,7 @@ pub const Insn = packed struct {
return alu(64, .arsh, dst, src);
}
fn jmp(op: JmpOp, dst: Reg, src: anytype, off: i16) Insn {
pub fn jmp(op: JmpOp, dst: Reg, src: anytype, off: i16) Insn {
return imm_reg(JMP | @enumToInt(op), dst, src, off);
}