| //! ARM 64-bit Instruction Set Architecture. |
| |
| use crate::dominator_tree::DominatorTree; |
| use crate::ir::{Function, Type}; |
| use crate::isa::aarch64::settings as aarch64_settings; |
| #[cfg(feature = "unwind")] |
| use crate::isa::unwind::systemv; |
| use crate::isa::{Builder as IsaBuilder, FunctionAlignment, TargetIsa}; |
| use crate::machinst::{ |
| compile, CompiledCode, CompiledCodeStencil, MachInst, MachTextSectionBuilder, Reg, SigSet, |
| TextSectionBuilder, VCode, |
| }; |
| use crate::result::CodegenResult; |
| use crate::settings as shared_settings; |
| use alloc::{boxed::Box, vec::Vec}; |
| use core::fmt; |
| use cranelift_control::ControlPlane; |
| use regalloc2::MachineEnv; |
| use target_lexicon::{Aarch64Architecture, Architecture, OperatingSystem, Triple}; |
| |
| // New backend: |
| mod abi; |
| pub mod inst; |
| mod lower; |
| pub mod settings; |
| |
| use inst::create_reg_env; |
| |
| use self::inst::EmitInfo; |
| |
| /// An AArch64 backend. |
| pub struct AArch64Backend { |
| triple: Triple, |
| flags: shared_settings::Flags, |
| isa_flags: aarch64_settings::Flags, |
| machine_env: MachineEnv, |
| } |
| |
| impl AArch64Backend { |
| /// Create a new AArch64 backend with the given (shared) flags. |
| pub fn new_with_flags( |
| triple: Triple, |
| flags: shared_settings::Flags, |
| isa_flags: aarch64_settings::Flags, |
| ) -> AArch64Backend { |
| let machine_env = create_reg_env(&flags); |
| AArch64Backend { |
| triple, |
| flags, |
| isa_flags, |
| machine_env, |
| } |
| } |
| |
| /// This performs lowering to VCode, register-allocates the code, computes block layout and |
| /// finalizes branches. The result is ready for binary emission. |
| fn compile_vcode( |
| &self, |
| func: &Function, |
| domtree: &DominatorTree, |
| ctrl_plane: &mut ControlPlane, |
| ) -> CodegenResult<(VCode<inst::Inst>, regalloc2::Output)> { |
| let emit_info = EmitInfo::new(self.flags.clone()); |
| let sigs = SigSet::new::<abi::AArch64MachineDeps>(func, &self.flags)?; |
| let abi = abi::AArch64Callee::new(func, self, &self.isa_flags, &sigs)?; |
| compile::compile::<AArch64Backend>(func, domtree, self, abi, emit_info, sigs, ctrl_plane) |
| } |
| } |
| |
| impl TargetIsa for AArch64Backend { |
| fn compile_function( |
| &self, |
| func: &Function, |
| domtree: &DominatorTree, |
| want_disasm: bool, |
| ctrl_plane: &mut ControlPlane, |
| ) -> CodegenResult<CompiledCodeStencil> { |
| let (vcode, regalloc_result) = self.compile_vcode(func, domtree, ctrl_plane)?; |
| |
| let emit_result = vcode.emit(®alloc_result, want_disasm, &self.flags, ctrl_plane); |
| let frame_size = emit_result.frame_size; |
| let value_labels_ranges = emit_result.value_labels_ranges; |
| let buffer = emit_result.buffer; |
| let sized_stackslot_offsets = emit_result.sized_stackslot_offsets; |
| let dynamic_stackslot_offsets = emit_result.dynamic_stackslot_offsets; |
| |
| if let Some(disasm) = emit_result.disasm.as_ref() { |
| log::debug!("disassembly:\n{}", disasm); |
| } |
| |
| Ok(CompiledCodeStencil { |
| buffer, |
| frame_size, |
| vcode: emit_result.disasm, |
| value_labels_ranges, |
| sized_stackslot_offsets, |
| dynamic_stackslot_offsets, |
| bb_starts: emit_result.bb_offsets, |
| bb_edges: emit_result.bb_edges, |
| }) |
| } |
| |
| fn name(&self) -> &'static str { |
| "aarch64" |
| } |
| |
| fn triple(&self) -> &Triple { |
| &self.triple |
| } |
| |
| fn flags(&self) -> &shared_settings::Flags { |
| &self.flags |
| } |
| |
| fn machine_env(&self) -> &MachineEnv { |
| &self.machine_env |
| } |
| |
| fn isa_flags(&self) -> Vec<shared_settings::Value> { |
| self.isa_flags.iter().collect() |
| } |
| |
| fn is_branch_protection_enabled(&self) -> bool { |
| self.isa_flags.use_bti() |
| } |
| |
| fn dynamic_vector_bytes(&self, _dyn_ty: Type) -> u32 { |
| 16 |
| } |
| |
| #[cfg(feature = "unwind")] |
| fn emit_unwind_info( |
| &self, |
| result: &CompiledCode, |
| kind: crate::machinst::UnwindInfoKind, |
| ) -> CodegenResult<Option<crate::isa::unwind::UnwindInfo>> { |
| use crate::isa::unwind::UnwindInfo; |
| use crate::machinst::UnwindInfoKind; |
| Ok(match kind { |
| UnwindInfoKind::SystemV => { |
| let mapper = self::inst::unwind::systemv::RegisterMapper; |
| Some(UnwindInfo::SystemV( |
| crate::isa::unwind::systemv::create_unwind_info_from_insts( |
| &result.buffer.unwind_info[..], |
| result.buffer.data().len(), |
| &mapper, |
| )?, |
| )) |
| } |
| UnwindInfoKind::Windows => { |
| // TODO: support Windows unwind info on AArch64 |
| None |
| } |
| _ => None, |
| }) |
| } |
| |
| #[cfg(feature = "unwind")] |
| fn create_systemv_cie(&self) -> Option<gimli::write::CommonInformationEntry> { |
| let is_apple_os = match self.triple.operating_system { |
| OperatingSystem::Darwin |
| | OperatingSystem::Ios |
| | OperatingSystem::MacOSX { .. } |
| | OperatingSystem::Tvos => true, |
| _ => false, |
| }; |
| |
| if self.isa_flags.sign_return_address() |
| && self.isa_flags.sign_return_address_with_bkey() |
| && !is_apple_os |
| { |
| unimplemented!("Specifying that the B key is used with pointer authentication instructions in the CIE is not implemented."); |
| } |
| |
| Some(inst::unwind::systemv::create_cie()) |
| } |
| |
| fn text_section_builder(&self, num_funcs: usize) -> Box<dyn TextSectionBuilder> { |
| Box::new(MachTextSectionBuilder::<inst::Inst>::new(num_funcs)) |
| } |
| |
| #[cfg(feature = "unwind")] |
| fn map_regalloc_reg_to_dwarf(&self, reg: Reg) -> Result<u16, systemv::RegisterMappingError> { |
| inst::unwind::systemv::map_reg(reg).map(|reg| reg.0) |
| } |
| |
| fn function_alignment(&self) -> FunctionAlignment { |
| inst::Inst::function_alignment() |
| } |
| |
| #[cfg(feature = "disas")] |
| fn to_capstone(&self) -> Result<capstone::Capstone, capstone::Error> { |
| use capstone::prelude::*; |
| let mut cs = Capstone::new() |
| .arm64() |
| .mode(arch::arm64::ArchMode::Arm) |
| .build()?; |
| // AArch64 uses inline constants rather than a separate constant pool right now. |
| // Without this option, Capstone will stop disassembling as soon as it sees |
| // an inline constant that is not also a valid instruction. With this option, |
| // Capstone will print a `.byte` directive with the bytes of the inline constant |
| // and continue to the next instruction. |
| cs.set_skipdata(true)?; |
| Ok(cs) |
| } |
| |
| fn has_native_fma(&self) -> bool { |
| true |
| } |
| |
| fn has_x86_blendv_lowering(&self, _: Type) -> bool { |
| false |
| } |
| |
| fn has_x86_pshufb_lowering(&self) -> bool { |
| false |
| } |
| |
| fn has_x86_pmulhrsw_lowering(&self) -> bool { |
| false |
| } |
| |
| fn has_x86_pmaddubsw_lowering(&self) -> bool { |
| false |
| } |
| } |
| |
| impl fmt::Display for AArch64Backend { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| f.debug_struct("MachBackend") |
| .field("name", &self.name()) |
| .field("triple", &self.triple()) |
| .field("flags", &format!("{}", self.flags())) |
| .finish() |
| } |
| } |
| |
| /// Create a new `isa::Builder`. |
| pub fn isa_builder(triple: Triple) -> IsaBuilder { |
| assert!(triple.architecture == Architecture::Aarch64(Aarch64Architecture::Aarch64)); |
| IsaBuilder { |
| triple, |
| setup: aarch64_settings::builder(), |
| constructor: |triple, shared_flags, builder| { |
| let isa_flags = aarch64_settings::Flags::new(&shared_flags, builder); |
| let backend = AArch64Backend::new_with_flags(triple, shared_flags, isa_flags); |
| Ok(backend.wrapped()) |
| }, |
| } |
| } |