rustc_target/asm/
bpf.rs

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1use std::fmt;
2
3use rustc_span::Symbol;
4
5use super::{InlineAsmArch, InlineAsmType, ModifierInfo};
6
7def_reg_class! {
8    Bpf BpfInlineAsmRegClass {
9        reg,
10        wreg,
11    }
12}
13
14impl BpfInlineAsmRegClass {
15    pub fn valid_modifiers(self, _arch: InlineAsmArch) -> &'static [char] {
16        &[]
17    }
18
19    pub fn suggest_class(self, _arch: InlineAsmArch, _ty: InlineAsmType) -> Option<Self> {
20        None
21    }
22
23    pub fn suggest_modifier(
24        self,
25        _arch: InlineAsmArch,
26        _ty: InlineAsmType,
27    ) -> Option<ModifierInfo> {
28        None
29    }
30
31    pub fn default_modifier(self, _arch: InlineAsmArch) -> Option<ModifierInfo> {
32        None
33    }
34
35    pub fn supported_types(
36        self,
37        _arch: InlineAsmArch,
38    ) -> &'static [(InlineAsmType, Option<Symbol>)] {
39        match self {
40            Self::reg => types! { _: I8, I16, I32, I64; },
41            Self::wreg => types! { alu32: I8, I16, I32; },
42        }
43    }
44}
45
46def_regs! {
47    Bpf BpfInlineAsmReg BpfInlineAsmRegClass {
48        r0: reg = ["r0"],
49        r1: reg = ["r1"],
50        r2: reg = ["r2"],
51        r3: reg = ["r3"],
52        r4: reg = ["r4"],
53        r5: reg = ["r5"],
54        r6: reg = ["r6"],
55        r7: reg = ["r7"],
56        r8: reg = ["r8"],
57        r9: reg = ["r9"],
58        w0: wreg = ["w0"],
59        w1: wreg = ["w1"],
60        w2: wreg = ["w2"],
61        w3: wreg = ["w3"],
62        w4: wreg = ["w4"],
63        w5: wreg = ["w5"],
64        w6: wreg = ["w6"],
65        w7: wreg = ["w7"],
66        w8: wreg = ["w8"],
67        w9: wreg = ["w9"],
68
69        #error = ["r10", "w10"] =>
70            "the stack pointer cannot be used as an operand for inline asm",
71    }
72}
73
74impl BpfInlineAsmReg {
75    pub fn emit(
76        self,
77        out: &mut dyn fmt::Write,
78        _arch: InlineAsmArch,
79        _modifier: Option<char>,
80    ) -> fmt::Result {
81        out.write_str(self.name())
82    }
83
84    pub fn overlapping_regs(self, mut cb: impl FnMut(BpfInlineAsmReg)) {
85        cb(self);
86
87        macro_rules! reg_conflicts {
88            (
89                $(
90                    $r:ident : $w:ident
91                ),*
92            ) => {
93                match self {
94                    $(
95                        Self::$r => {
96                            cb(Self::$w);
97                        }
98                        Self::$w => {
99                            cb(Self::$r);
100                        }
101                    )*
102                }
103            };
104        }
105
106        reg_conflicts! {
107            r0 : w0,
108            r1 : w1,
109            r2 : w2,
110            r3 : w3,
111            r4 : w4,
112            r5 : w5,
113            r6 : w6,
114            r7 : w7,
115            r8 : w8,
116            r9 : w9
117        }
118    }
119}
rustc_target/asm/bpf.rs

rustc_target/asm/
bpf.rs
