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Auto merge of #91224 - couchand:2021-11/avr-asm, r=Amanieu
Support AVR for inline asm! A first pass at support for the AVR platform in inline `asm!`. Passes the initial compiler tests, have not yet done more complete verification. In particular, the register classes could use a lot more fleshing out, this draft PR so far only includes the most basic. cc `@Amanieu` `@dylanmckay`
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,196 @@ | ||
| use super::{InlineAsmArch, InlineAsmType}; | ||
| use rustc_macros::HashStable_Generic; | ||
| use std::fmt; | ||
|
|
||
| def_reg_class! { | ||
| Avr AvrInlineAsmRegClass { | ||
| reg, | ||
| reg_upper, | ||
| reg_pair, | ||
| reg_iw, | ||
| reg_ptr, | ||
| } | ||
| } | ||
|
|
||
| impl AvrInlineAsmRegClass { | ||
| pub fn valid_modifiers(self, _arch: InlineAsmArch) -> &'static [char] { | ||
| match self { | ||
| Self::reg_pair | Self::reg_iw | Self::reg_ptr => &['h', 'l'], | ||
| _ => &[], | ||
| } | ||
| } | ||
|
|
||
| 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; }, | ||
| Self::reg_upper => types! { _: I8; }, | ||
| Self::reg_pair => types! { _: I16; }, | ||
| Self::reg_iw => types! { _: I16; }, | ||
| Self::reg_ptr => types! { _: I16; }, | ||
| } | ||
| } | ||
| } | ||
|
|
||
| def_regs! { | ||
| Avr AvrInlineAsmReg AvrInlineAsmRegClass { | ||
| r2: reg = ["r2"], | ||
| r3: reg = ["r3"], | ||
| r4: reg = ["r4"], | ||
| r5: reg = ["r5"], | ||
| r6: reg = ["r6"], | ||
| r7: reg = ["r7"], | ||
| r8: reg = ["r8"], | ||
| r9: reg = ["r9"], | ||
| r10: reg = ["r10"], | ||
| r11: reg = ["r11"], | ||
| r12: reg = ["r12"], | ||
| r13: reg = ["r13"], | ||
| r14: reg = ["r14"], | ||
| r15: reg = ["r15"], | ||
| r16: reg, reg_upper = ["r16"], | ||
| r17: reg, reg_upper = ["r17"], | ||
| r18: reg, reg_upper = ["r18"], | ||
| r19: reg, reg_upper = ["r19"], | ||
| r20: reg, reg_upper = ["r20"], | ||
| r21: reg, reg_upper = ["r21"], | ||
| r22: reg, reg_upper = ["r22"], | ||
| r23: reg, reg_upper = ["r23"], | ||
| r24: reg, reg_upper = ["r24"], | ||
| r25: reg, reg_upper = ["r25"], | ||
| r26: reg, reg_upper = ["r26", "XL"], | ||
| r27: reg, reg_upper = ["r27", "XH"], | ||
| r30: reg, reg_upper = ["r30", "ZL"], | ||
| r31: reg, reg_upper = ["r31", "ZH"], | ||
|
|
||
| r3r2: reg_pair = ["r3r2"], | ||
| r5r4: reg_pair = ["r5r4"], | ||
| r7r6: reg_pair = ["r7r6"], | ||
| r9r8: reg_pair = ["r9r8"], | ||
| r11r10: reg_pair = ["r11r10"], | ||
| r13r12: reg_pair = ["r13r12"], | ||
| r15r14: reg_pair = ["r15r14"], | ||
| r17r16: reg_pair = ["r17r16"], | ||
| r19r18: reg_pair = ["r19r18"], | ||
| r21r20: reg_pair = ["r21r20"], | ||
| r23r22: reg_pair = ["r23r22"], | ||
|
|
||
| r25r24: reg_iw, reg_pair = ["r25r24"], | ||
|
|
||
| X: reg_ptr, reg_iw, reg_pair = ["r27r26", "X"], | ||
| Z: reg_ptr, reg_iw, reg_pair = ["r31r30", "Z"], | ||
|
|
||
| #error = ["Y", "YL", "YH"] => | ||
| "the frame pointer cannot be used as an operand for inline asm", | ||
| #error = ["SP", "SPL", "SPH"] => | ||
| "the stack pointer cannot be used as an operand for inline asm", | ||
| #error = ["r0", "r1", "r1r0"] => | ||
| "r0 and r1 are not available due to an issue in LLVM", | ||
| } | ||
| } | ||
|
|
||
| macro_rules! emit_pairs { | ||
| ( | ||
| $self:ident $modifier:ident, | ||
| $($pair:ident $name:literal $hi:literal $lo:literal,)* | ||
| ) => { | ||
| match ($self, $modifier) { | ||
| $( | ||
| (AvrInlineAsmReg::$pair, Some('h')) => $hi, | ||
| (AvrInlineAsmReg::$pair, Some('l')) => $lo, | ||
| (AvrInlineAsmReg::$pair, _) => $name, | ||
| )* | ||
| _ => $self.name(), | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| impl AvrInlineAsmReg { | ||
| pub fn emit( | ||
| self, | ||
| out: &mut dyn fmt::Write, | ||
| _arch: InlineAsmArch, | ||
| modifier: Option<char>, | ||
| ) -> fmt::Result { | ||
| let name = emit_pairs! { | ||
| self modifier, | ||
| Z "Z" "ZH" "ZL", | ||
| X "X" "XH" "XL", | ||
| r25r24 "r25:r24" "r25" "r24", | ||
| r23r22 "r23:r22" "r23" "r22", | ||
| r21r20 "r21:r20" "r21" "r20", | ||
| r19r18 "r19:r18" "r19" "r18", | ||
| r17r16 "r17:r16" "r17" "r16", | ||
| r15r14 "r15:r14" "r15" "r14", | ||
| r13r12 "r13:r12" "r13" "r12", | ||
| r11r10 "r11:r10" "r11" "r10", | ||
| r9r8 "r9:r8" "r9" "r8", | ||
| r7r6 "r7:r6" "r7" "r6", | ||
| r5r4 "r5:r4" "r5" "r4", | ||
| r3r2 "r3:r2" "r3" "r2", | ||
| }; | ||
| out.write_str(name) | ||
| } | ||
|
|
||
| pub fn overlapping_regs(self, mut cb: impl FnMut(AvrInlineAsmReg)) { | ||
| cb(self); | ||
|
|
||
| macro_rules! reg_conflicts { | ||
| ( | ||
| $( | ||
| $pair:ident : $hi:ident $lo:ident, | ||
| )* | ||
| ) => { | ||
| match self { | ||
| $( | ||
| Self::$pair => { | ||
| cb(Self::$hi); | ||
| cb(Self::$lo); | ||
| } | ||
| Self::$hi => { | ||
| cb(Self::$pair); | ||
| } | ||
| Self::$lo => { | ||
| cb(Self::$pair); | ||
| } | ||
| )* | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| reg_conflicts! { | ||
| Z : r31 r30, | ||
| X : r27 r26, | ||
| r25r24 : r25 r24, | ||
| r23r22 : r23 r22, | ||
| r21r20 : r21 r20, | ||
| r19r18 : r19 r18, | ||
| r17r16 : r17 r16, | ||
| r15r14 : r15 r14, | ||
| r13r12 : r13 r12, | ||
| r11r10 : r11 r10, | ||
| r9r8 : r9 r8, | ||
| r7r6 : r7 r6, | ||
| r5r4 : r5 r4, | ||
| r3r2 : r3 r2, | ||
| } | ||
| } | ||
| } |
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