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use super::{InlineAsmArch, InlineAsmType, Target}; use rustc_macros::HashStable_Generic; use std::fmt; def_reg_class! { Bpf BpfInlineAsmRegClass { reg, wreg, } } impl BpfInlineAsmRegClass { pub fn valid_modifiers(self, _arch: InlineAsmArch) -> &'static [char] { &[] } pub fn suggest_class(self, _arch: InlineAsmArch, _ty: InlineAsmType) -> Option<Self> { None } pub fn suggest_modifier( self, _arch: InlineAsmArch, _ty: InlineAsmType, ) -> Option<(char, &'static str)> { None } pub fn default_modifier(self, _arch: InlineAsmArch) -> Option<(char, &'static str)> { None } pub fn supported_types( self, _arch: InlineAsmArch, ) -> &'static [(InlineAsmType, Option<&'static str>)] { match self { Self::reg => types! { _: I8, I16, I32, I64; }, Self::wreg => types! { "alu32": I8, I16, I32; }, } } } fn only_alu32( _arch: InlineAsmArch, mut has_feature: impl FnMut(&str) -> bool, _target: &Target, ) -> Result<(), &'static str> { if !has_feature("alu32") { Err("register can't be used without the `alu32` target feature") } else { Ok(()) } } def_regs! { Bpf BpfInlineAsmReg BpfInlineAsmRegClass { r0: reg = ["r0"], r1: reg = ["r1"], r2: reg = ["r2"], r3: reg = ["r3"], r4: reg = ["r4"], r5: reg = ["r5"], r6: reg = ["r6"], r7: reg = ["r7"], r8: reg = ["r8"], r9: reg = ["r9"], w0: wreg = ["w0"] % only_alu32, w1: wreg = ["w1"] % only_alu32, w2: wreg = ["w2"] % only_alu32, w3: wreg = ["w3"] % only_alu32, w4: wreg = ["w4"] % only_alu32, w5: wreg = ["w5"] % only_alu32, w6: wreg = ["w6"] % only_alu32, w7: wreg = ["w7"] % only_alu32, w8: wreg = ["w8"] % only_alu32, w9: wreg = ["w9"] % only_alu32, #error = ["r10", "w10"] => "the stack pointer cannot be used as an operand for inline asm", } } impl BpfInlineAsmReg { pub fn emit( self, out: &mut dyn fmt::Write, _arch: InlineAsmArch, _modifier: Option<char>, ) -> fmt::Result { out.write_str(self.name()) } pub fn overlapping_regs(self, mut cb: impl FnMut(BpfInlineAsmReg)) { cb(self); macro_rules! reg_conflicts { ( $( $r:ident : $w:ident ),* ) => { match self { $( Self::$r => { cb(Self::$w); } Self::$w => { cb(Self::$r); } )* } }; } reg_conflicts! { r0 : w0, r1 : w1, r2 : w2, r3 : w3, r4 : w4, r5 : w5, r6 : w6, r7 : w7, r8 : w8, r9 : w9 } } }