| //! X86_64-bit Instruction Set Architecture. |
| |
| use self::inst::EmitInfo; |
| |
| use super::TargetIsa; |
| use crate::ir::{condcodes::IntCC, Function, Type}; |
| #[cfg(feature = "unwind")] |
| use crate::isa::unwind::systemv; |
| use crate::isa::x64::{inst::regs::create_reg_env_systemv, settings as x64_settings}; |
| use crate::isa::Builder as IsaBuilder; |
| use crate::machinst::Reg; |
| use crate::machinst::{compile, CompiledCode, MachTextSectionBuilder, TextSectionBuilder, VCode}; |
| use crate::result::{CodegenError, CodegenResult}; |
| use crate::settings::{self as shared_settings, Flags}; |
| use alloc::{boxed::Box, vec::Vec}; |
| use core::fmt; |
| use regalloc2::MachineEnv; |
| use target_lexicon::Triple; |
| |
| mod abi; |
| pub mod encoding; |
| mod inst; |
| mod lower; |
| mod settings; |
| |
| /// An X64 backend. |
| pub(crate) struct X64Backend { |
| triple: Triple, |
| flags: Flags, |
| x64_flags: x64_settings::Flags, |
| reg_env: MachineEnv, |
| } |
| |
| impl X64Backend { |
| /// Create a new X64 backend with the given (shared) flags. |
| fn new_with_flags(triple: Triple, flags: Flags, x64_flags: x64_settings::Flags) -> Self { |
| let reg_env = create_reg_env_systemv(&flags); |
| Self { |
| triple, |
| flags, |
| x64_flags, |
| reg_env, |
| } |
| } |
| |
| fn compile_vcode( |
| &self, |
| func: &Function, |
| flags: Flags, |
| ) -> CodegenResult<(VCode<inst::Inst>, regalloc2::Output)> { |
| // This performs lowering to VCode, register-allocates the code, computes |
| // block layout and finalizes branches. The result is ready for binary emission. |
| let emit_info = EmitInfo::new(flags.clone(), self.x64_flags.clone()); |
| let abi = Box::new(abi::X64ABICallee::new(&func, self, &self.x64_flags)?); |
| compile::compile::<Self>(&func, self, abi, &self.reg_env, emit_info) |
| } |
| } |
| |
| impl TargetIsa for X64Backend { |
| fn compile_function(&self, func: &Function, want_disasm: bool) -> CodegenResult<CompiledCode> { |
| let flags = self.flags(); |
| let (vcode, regalloc_result) = self.compile_vcode(func, flags.clone())?; |
| |
| let emit_result = vcode.emit(®alloc_result, want_disasm, flags.machine_code_cfg_info()); |
| let frame_size = emit_result.frame_size; |
| let value_labels_ranges = emit_result.value_labels_ranges; |
| let buffer = emit_result.buffer.finish(); |
| 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::trace!("disassembly:\n{}", disasm); |
| } |
| |
| Ok(CompiledCode { |
| buffer, |
| frame_size, |
| disasm: 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 flags(&self) -> &Flags { |
| &self.flags |
| } |
| |
| fn isa_flags(&self) -> Vec<shared_settings::Value> { |
| self.x64_flags.iter().collect() |
| } |
| |
| fn dynamic_vector_bytes(&self, _dyn_ty: Type) -> u32 { |
| 16 |
| } |
| |
| fn name(&self) -> &'static str { |
| "x64" |
| } |
| |
| fn triple(&self) -> &Triple { |
| &self.triple |
| } |
| |
| fn unsigned_add_overflow_condition(&self) -> IntCC { |
| // Unsigned `<`; this corresponds to the carry flag set on x86, which |
| // indicates an add has overflowed. |
| IntCC::UnsignedLessThan |
| } |
| |
| #[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 => Some(UnwindInfo::WindowsX64( |
| crate::isa::unwind::winx64::create_unwind_info_from_insts::< |
| self::inst::unwind::winx64::RegisterMapper, |
| >(&result.buffer.unwind_info[..])?, |
| )), |
| _ => None, |
| }) |
| } |
| |
| #[cfg(feature = "unwind")] |
| fn create_systemv_cie(&self) -> Option<gimli::write::CommonInformationEntry> { |
| Some(inst::unwind::systemv::create_cie()) |
| } |
| |
| #[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 text_section_builder(&self, num_funcs: u32) -> Box<dyn TextSectionBuilder> { |
| Box::new(MachTextSectionBuilder::<inst::Inst>::new(num_funcs)) |
| } |
| } |
| |
| impl fmt::Display for X64Backend { |
| 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(crate) fn isa_builder(triple: Triple) -> IsaBuilder { |
| IsaBuilder { |
| triple, |
| setup: x64_settings::builder(), |
| constructor: isa_constructor, |
| } |
| } |
| |
| fn isa_constructor( |
| triple: Triple, |
| shared_flags: Flags, |
| builder: shared_settings::Builder, |
| ) -> CodegenResult<Box<dyn TargetIsa>> { |
| let isa_flags = x64_settings::Flags::new(&shared_flags, builder); |
| |
| // Check for compatibility between flags and ISA level |
| // requested. In particular, SIMD support requires SSE4.2. |
| if shared_flags.enable_simd() { |
| if !isa_flags.has_sse3() |
| || !isa_flags.has_ssse3() |
| || !isa_flags.has_sse41() |
| || !isa_flags.has_sse42() |
| { |
| return Err(CodegenError::Unsupported( |
| "SIMD support requires SSE3, SSSE3, SSE4.1, and SSE4.2 on x86_64.".into(), |
| )); |
| } |
| } |
| |
| let backend = X64Backend::new_with_flags(triple, shared_flags, isa_flags); |
| Ok(Box::new(backend)) |
| } |
| |
| #[cfg(test)] |
| mod test { |
| use super::*; |
| use crate::cursor::{Cursor, FuncCursor}; |
| use crate::ir::{types::*, SourceLoc, ValueLabel, ValueLabelStart}; |
| use crate::ir::{AbiParam, ExternalName, Function, InstBuilder, JumpTableData, Signature}; |
| use crate::isa::CallConv; |
| use crate::settings; |
| use crate::settings::Configurable; |
| use core::str::FromStr; |
| use cranelift_entity::EntityRef; |
| use target_lexicon::Triple; |
| |
| /// We have to test cold blocks by observing final machine code, |
| /// rather than VCode, because the VCode orders blocks in lowering |
| /// order, not emission order. (The exact difference between the |
| /// two is that cold blocks are sunk in the latter.) We might as |
| /// well do the test here, where we have a backend to use. |
| #[test] |
| fn test_cold_blocks() { |
| let name = ExternalName::testcase("test0"); |
| let mut sig = Signature::new(CallConv::SystemV); |
| sig.params.push(AbiParam::new(I32)); |
| sig.returns.push(AbiParam::new(I32)); |
| let mut func = Function::with_name_signature(name, sig); |
| // Add debug info: this tests the debug machinery wrt cold |
| // blocks as well. |
| func.dfg.collect_debug_info(); |
| |
| let bb0 = func.dfg.make_block(); |
| let arg0 = func.dfg.append_block_param(bb0, I32); |
| let bb1 = func.dfg.make_block(); |
| let bb2 = func.dfg.make_block(); |
| let bb3 = func.dfg.make_block(); |
| let bb1_param = func.dfg.append_block_param(bb1, I32); |
| let bb3_param = func.dfg.append_block_param(bb3, I32); |
| |
| let mut pos = FuncCursor::new(&mut func); |
| |
| pos.insert_block(bb0); |
| pos.set_srcloc(SourceLoc::new(1)); |
| let v0 = pos.ins().iconst(I32, 0x1234); |
| pos.set_srcloc(SourceLoc::new(2)); |
| let v1 = pos.ins().iadd(arg0, v0); |
| pos.ins().brnz(v1, bb1, &[v1]); |
| pos.ins().jump(bb2, &[]); |
| |
| pos.insert_block(bb1); |
| pos.set_srcloc(SourceLoc::new(3)); |
| let v2 = pos.ins().isub(v1, v0); |
| pos.set_srcloc(SourceLoc::new(4)); |
| let v3 = pos.ins().iadd(v2, bb1_param); |
| pos.ins().brnz(v1, bb2, &[]); |
| pos.ins().jump(bb3, &[v3]); |
| |
| pos.func.layout.set_cold(bb2); |
| pos.insert_block(bb2); |
| pos.set_srcloc(SourceLoc::new(5)); |
| let v4 = pos.ins().iadd(v1, v0); |
| pos.ins().brnz(v4, bb2, &[]); |
| pos.ins().jump(bb1, &[v4]); |
| |
| pos.insert_block(bb3); |
| pos.set_srcloc(SourceLoc::new(6)); |
| pos.ins().return_(&[bb3_param]); |
| |
| // Create some debug info. Make one label that follows all the |
| // values around. Note that this is usually done via an API on |
| // the FunctionBuilder, but that's in cranelift_frontend |
| // (i.e., a higher level of the crate DAG) so we have to build |
| // it manually here. |
| pos.func.dfg.values_labels.as_mut().unwrap().insert( |
| v0, |
| crate::ir::ValueLabelAssignments::Starts(vec![ValueLabelStart { |
| from: SourceLoc::new(1), |
| label: ValueLabel::new(1), |
| }]), |
| ); |
| pos.func.dfg.values_labels.as_mut().unwrap().insert( |
| v1, |
| crate::ir::ValueLabelAssignments::Starts(vec![ValueLabelStart { |
| from: SourceLoc::new(2), |
| label: ValueLabel::new(1), |
| }]), |
| ); |
| pos.func.dfg.values_labels.as_mut().unwrap().insert( |
| v2, |
| crate::ir::ValueLabelAssignments::Starts(vec![ValueLabelStart { |
| from: SourceLoc::new(3), |
| label: ValueLabel::new(1), |
| }]), |
| ); |
| pos.func.dfg.values_labels.as_mut().unwrap().insert( |
| v3, |
| crate::ir::ValueLabelAssignments::Starts(vec![ValueLabelStart { |
| from: SourceLoc::new(4), |
| label: ValueLabel::new(1), |
| }]), |
| ); |
| pos.func.dfg.values_labels.as_mut().unwrap().insert( |
| v4, |
| crate::ir::ValueLabelAssignments::Starts(vec![ValueLabelStart { |
| from: SourceLoc::new(5), |
| label: ValueLabel::new(1), |
| }]), |
| ); |
| |
| let mut shared_flags_builder = settings::builder(); |
| shared_flags_builder.set("opt_level", "none").unwrap(); |
| shared_flags_builder.set("enable_verifier", "true").unwrap(); |
| let shared_flags = settings::Flags::new(shared_flags_builder); |
| let isa_flags = x64_settings::Flags::new(&shared_flags, x64_settings::builder()); |
| let backend = X64Backend::new_with_flags( |
| Triple::from_str("x86_64").unwrap(), |
| shared_flags, |
| isa_flags, |
| ); |
| let result = backend |
| .compile_function(&mut func, /* want_disasm = */ false) |
| .unwrap(); |
| let code = result.buffer.data(); |
| |
| // 00000000 55 push rbp |
| // 00000001 4889E5 mov rbp,rsp |
| // 00000004 81C734120000 add edi,0x1234 |
| // 0000000A 85FF test edi,edi |
| // 0000000C 0F841C000000 jz near 0x2e |
| // 00000012 4989F8 mov r8,rdi |
| // 00000015 4889F8 mov rax,rdi |
| // 00000018 81E834120000 sub eax,0x1234 |
| // 0000001E 4401C0 add eax,r8d |
| // 00000021 85FF test edi,edi |
| // 00000023 0F8505000000 jnz near 0x2e |
| // 00000029 4889EC mov rsp,rbp |
| // 0000002C 5D pop rbp |
| // 0000002D C3 ret |
| // 0000002E 4989F8 mov r8,rdi |
| // 00000031 4181C034120000 add r8d,0x1234 |
| // 00000038 4585C0 test r8d,r8d |
| // 0000003B 0F85EDFFFFFF jnz near 0x2e |
| // 00000041 E9CFFFFFFF jmp 0x15 |
| |
| let golden = vec![ |
| 85, 72, 137, 229, 129, 199, 52, 18, 0, 0, 133, 255, 15, 132, 28, 0, 0, 0, 73, 137, 248, |
| 72, 137, 248, 129, 232, 52, 18, 0, 0, 68, 1, 192, 133, 255, 15, 133, 5, 0, 0, 0, 72, |
| 137, 236, 93, 195, 73, 137, 248, 65, 129, 192, 52, 18, 0, 0, 69, 133, 192, 15, 133, |
| 237, 255, 255, 255, 233, 207, 255, 255, 255, |
| ]; |
| |
| assert_eq!(code, &golden[..]); |
| } |
| |
| // Check that feature tests for SIMD work correctly. |
| #[test] |
| fn simd_required_features() { |
| let mut shared_flags_builder = settings::builder(); |
| shared_flags_builder.set("enable_simd", "true").unwrap(); |
| let shared_flags = settings::Flags::new(shared_flags_builder); |
| let mut isa_builder = crate::isa::lookup_by_name("x86_64").unwrap(); |
| isa_builder.set("has_sse3", "false").unwrap(); |
| isa_builder.set("has_ssse3", "false").unwrap(); |
| isa_builder.set("has_sse41", "false").unwrap(); |
| isa_builder.set("has_sse42", "false").unwrap(); |
| assert!(matches!( |
| isa_builder.finish(shared_flags), |
| Err(CodegenError::Unsupported(_)), |
| )); |
| } |
| |
| // Check that br_table lowers properly. We can't test this with an |
| // ordinary compile-test because the br_table pseudoinstruction |
| // expands during emission. |
| #[test] |
| fn br_table() { |
| let name = ExternalName::testcase("test0"); |
| let mut sig = Signature::new(CallConv::SystemV); |
| sig.params.push(AbiParam::new(I32)); |
| sig.returns.push(AbiParam::new(I32)); |
| let mut func = Function::with_name_signature(name, sig); |
| |
| let bb0 = func.dfg.make_block(); |
| let arg0 = func.dfg.append_block_param(bb0, I32); |
| let bb1 = func.dfg.make_block(); |
| let bb2 = func.dfg.make_block(); |
| let bb3 = func.dfg.make_block(); |
| |
| let mut pos = FuncCursor::new(&mut func); |
| |
| pos.insert_block(bb0); |
| let mut jt_data = JumpTableData::new(); |
| jt_data.push_entry(bb1); |
| jt_data.push_entry(bb2); |
| let jt = pos.func.create_jump_table(jt_data); |
| pos.ins().br_table(arg0, bb3, jt); |
| |
| pos.insert_block(bb1); |
| let v1 = pos.ins().iconst(I32, 1); |
| pos.ins().return_(&[v1]); |
| |
| pos.insert_block(bb2); |
| let v2 = pos.ins().iconst(I32, 2); |
| pos.ins().return_(&[v2]); |
| |
| pos.insert_block(bb3); |
| let v3 = pos.ins().iconst(I32, 3); |
| pos.ins().return_(&[v3]); |
| |
| let mut shared_flags_builder = settings::builder(); |
| shared_flags_builder.set("opt_level", "none").unwrap(); |
| shared_flags_builder.set("enable_verifier", "true").unwrap(); |
| let shared_flags = settings::Flags::new(shared_flags_builder); |
| let isa_flags = x64_settings::Flags::new(&shared_flags, x64_settings::builder()); |
| let backend = X64Backend::new_with_flags( |
| Triple::from_str("x86_64").unwrap(), |
| shared_flags, |
| isa_flags, |
| ); |
| let result = backend |
| .compile_function(&mut func, /* want_disasm = */ false) |
| .unwrap(); |
| let code = result.buffer.data(); |
| |
| // 00000000 55 push rbp |
| // 00000001 4889E5 mov rbp,rsp |
| // 00000004 41B900000000 mov r9d,0x0 |
| // 0000000A 83FF02 cmp edi,byte +0x2 |
| // 0000000D 0F8320000000 jnc near 0x33 |
| // 00000013 8BF7 mov esi,edi |
| // 00000015 490F43F1 cmovnc rsi,r9 |
| // 00000019 4C8D0D0B000000 lea r9,[rel 0x2b] |
| // 00000020 496374B100 movsxd rsi,dword [r9+rsi*4+0x0] |
| // 00000025 4901F1 add r9,rsi |
| // 00000028 41FFE1 jmp r9 |
| // 0000002B 1200 adc al,[rax] |
| // 0000002D 0000 add [rax],al |
| // 0000002F 1C00 sbb al,0x0 |
| // 00000031 0000 add [rax],al |
| // 00000033 B803000000 mov eax,0x3 |
| // 00000038 4889EC mov rsp,rbp |
| // 0000003B 5D pop rbp |
| // 0000003C C3 ret |
| // 0000003D B801000000 mov eax,0x1 |
| // 00000042 4889EC mov rsp,rbp |
| // 00000045 5D pop rbp |
| // 00000046 C3 ret |
| // 00000047 B802000000 mov eax,0x2 |
| // 0000004C 4889EC mov rsp,rbp |
| // 0000004F 5D pop rbp |
| // 00000050 C3 ret |
| |
| let golden = vec![ |
| 85, 72, 137, 229, 65, 185, 0, 0, 0, 0, 131, 255, 2, 15, 131, 32, 0, 0, 0, 139, 247, 73, |
| 15, 67, 241, 76, 141, 13, 11, 0, 0, 0, 73, 99, 116, 177, 0, 73, 1, 241, 65, 255, 225, |
| 18, 0, 0, 0, 28, 0, 0, 0, 184, 3, 0, 0, 0, 72, 137, 236, 93, 195, 184, 1, 0, 0, 0, 72, |
| 137, 236, 93, 195, 184, 2, 0, 0, 0, 72, 137, 236, 93, 195, |
| ]; |
| |
| assert_eq!(code, &golden[..]); |
| } |
| } |
