| //! Defines `ObjectModule`. |
| |
| use anyhow::anyhow; |
| use cranelift_codegen::binemit::{Addend, CodeOffset, Reloc}; |
| use cranelift_codegen::entity::SecondaryMap; |
| use cranelift_codegen::isa::{OwnedTargetIsa, TargetIsa}; |
| use cranelift_codegen::{self, ir, MachReloc}; |
| use cranelift_control::ControlPlane; |
| use cranelift_module::{ |
| DataDescription, DataId, FuncId, Init, Linkage, Module, ModuleDeclarations, ModuleError, |
| ModuleExtName, ModuleReloc, ModuleResult, |
| }; |
| use log::info; |
| use object::write::{ |
| Object, Relocation, SectionId, StandardSection, Symbol, SymbolId, SymbolSection, |
| }; |
| use object::{ |
| RelocationEncoding, RelocationKind, SectionKind, SymbolFlags, SymbolKind, SymbolScope, |
| }; |
| use std::collections::HashMap; |
| use std::mem; |
| use target_lexicon::PointerWidth; |
| |
| /// A builder for `ObjectModule`. |
| pub struct ObjectBuilder { |
| isa: OwnedTargetIsa, |
| binary_format: object::BinaryFormat, |
| architecture: object::Architecture, |
| flags: object::FileFlags, |
| endian: object::Endianness, |
| name: Vec<u8>, |
| libcall_names: Box<dyn Fn(ir::LibCall) -> String + Send + Sync>, |
| per_function_section: bool, |
| } |
| |
| impl ObjectBuilder { |
| /// Create a new `ObjectBuilder` using the given Cranelift target, that |
| /// can be passed to [`ObjectModule::new`]. |
| /// |
| /// The `libcall_names` function provides a way to translate `cranelift_codegen`'s [ir::LibCall] |
| /// enum to symbols. LibCalls are inserted in the IR as part of the legalization for certain |
| /// floating point instructions, and for stack probes. If you don't know what to use for this |
| /// argument, use [cranelift_module::default_libcall_names](). |
| pub fn new<V: Into<Vec<u8>>>( |
| isa: OwnedTargetIsa, |
| name: V, |
| libcall_names: Box<dyn Fn(ir::LibCall) -> String + Send + Sync>, |
| ) -> ModuleResult<Self> { |
| let mut file_flags = object::FileFlags::None; |
| let binary_format = match isa.triple().binary_format { |
| target_lexicon::BinaryFormat::Elf => object::BinaryFormat::Elf, |
| target_lexicon::BinaryFormat::Coff => object::BinaryFormat::Coff, |
| target_lexicon::BinaryFormat::Macho => object::BinaryFormat::MachO, |
| target_lexicon::BinaryFormat::Wasm => { |
| return Err(ModuleError::Backend(anyhow!( |
| "binary format wasm is unsupported", |
| ))) |
| } |
| target_lexicon::BinaryFormat::Unknown => { |
| return Err(ModuleError::Backend(anyhow!("binary format is unknown"))) |
| } |
| other => { |
| return Err(ModuleError::Backend(anyhow!( |
| "binary format {} not recognized", |
| other |
| ))) |
| } |
| }; |
| let architecture = match isa.triple().architecture { |
| target_lexicon::Architecture::X86_32(_) => object::Architecture::I386, |
| target_lexicon::Architecture::X86_64 => object::Architecture::X86_64, |
| target_lexicon::Architecture::Arm(_) => object::Architecture::Arm, |
| target_lexicon::Architecture::Aarch64(_) => object::Architecture::Aarch64, |
| target_lexicon::Architecture::Riscv64(_) => { |
| if binary_format != object::BinaryFormat::Elf { |
| return Err(ModuleError::Backend(anyhow!( |
| "binary format {:?} is not supported for riscv64", |
| binary_format, |
| ))); |
| } |
| // FIXME(#4994) get the right variant from the TargetIsa |
| file_flags = object::FileFlags::Elf { |
| os_abi: object::elf::ELFOSABI_NONE, |
| abi_version: 0, |
| e_flags: object::elf::EF_RISCV_RVC | object::elf::EF_RISCV_FLOAT_ABI_DOUBLE, |
| }; |
| object::Architecture::Riscv64 |
| } |
| target_lexicon::Architecture::S390x => object::Architecture::S390x, |
| architecture => { |
| return Err(ModuleError::Backend(anyhow!( |
| "target architecture {:?} is unsupported", |
| architecture, |
| ))) |
| } |
| }; |
| let endian = match isa.triple().endianness().unwrap() { |
| target_lexicon::Endianness::Little => object::Endianness::Little, |
| target_lexicon::Endianness::Big => object::Endianness::Big, |
| }; |
| Ok(Self { |
| isa, |
| binary_format, |
| architecture, |
| flags: file_flags, |
| endian, |
| name: name.into(), |
| libcall_names, |
| per_function_section: false, |
| }) |
| } |
| |
| /// Set if every function should end up in their own section. |
| pub fn per_function_section(&mut self, per_function_section: bool) -> &mut Self { |
| self.per_function_section = per_function_section; |
| self |
| } |
| } |
| |
| /// An `ObjectModule` implements `Module` and emits ".o" files using the `object` library. |
| /// |
| /// See the `ObjectBuilder` for a convenient way to construct `ObjectModule` instances. |
| pub struct ObjectModule { |
| isa: OwnedTargetIsa, |
| object: Object<'static>, |
| declarations: ModuleDeclarations, |
| functions: SecondaryMap<FuncId, Option<(SymbolId, bool)>>, |
| data_objects: SecondaryMap<DataId, Option<(SymbolId, bool)>>, |
| relocs: Vec<SymbolRelocs>, |
| libcalls: HashMap<ir::LibCall, SymbolId>, |
| libcall_names: Box<dyn Fn(ir::LibCall) -> String + Send + Sync>, |
| known_symbols: HashMap<ir::KnownSymbol, SymbolId>, |
| per_function_section: bool, |
| } |
| |
| impl ObjectModule { |
| /// Create a new `ObjectModule` using the given Cranelift target. |
| pub fn new(builder: ObjectBuilder) -> Self { |
| let mut object = Object::new(builder.binary_format, builder.architecture, builder.endian); |
| object.flags = builder.flags; |
| object.add_file_symbol(builder.name); |
| Self { |
| isa: builder.isa, |
| object, |
| declarations: ModuleDeclarations::default(), |
| functions: SecondaryMap::new(), |
| data_objects: SecondaryMap::new(), |
| relocs: Vec::new(), |
| libcalls: HashMap::new(), |
| libcall_names: builder.libcall_names, |
| known_symbols: HashMap::new(), |
| per_function_section: builder.per_function_section, |
| } |
| } |
| } |
| |
| fn validate_symbol(name: &str) -> ModuleResult<()> { |
| // null bytes are not allowed in symbol names and will cause the `object` |
| // crate to panic. Let's return a clean error instead. |
| if name.contains("\0") { |
| return Err(ModuleError::Backend(anyhow::anyhow!( |
| "Symbol {:?} has a null byte, which is disallowed", |
| name |
| ))); |
| } |
| Ok(()) |
| } |
| |
| impl Module for ObjectModule { |
| fn isa(&self) -> &dyn TargetIsa { |
| &*self.isa |
| } |
| |
| fn declarations(&self) -> &ModuleDeclarations { |
| &self.declarations |
| } |
| |
| fn declare_function( |
| &mut self, |
| name: &str, |
| linkage: Linkage, |
| signature: &ir::Signature, |
| ) -> ModuleResult<FuncId> { |
| validate_symbol(name)?; |
| |
| let (id, linkage) = self |
| .declarations |
| .declare_function(name, linkage, signature)?; |
| |
| let (scope, weak) = translate_linkage(linkage); |
| |
| if let Some((function, _defined)) = self.functions[id] { |
| let symbol = self.object.symbol_mut(function); |
| symbol.scope = scope; |
| symbol.weak = weak; |
| } else { |
| let symbol_id = self.object.add_symbol(Symbol { |
| name: name.as_bytes().to_vec(), |
| value: 0, |
| size: 0, |
| kind: SymbolKind::Text, |
| scope, |
| weak, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }); |
| self.functions[id] = Some((symbol_id, false)); |
| } |
| |
| Ok(id) |
| } |
| |
| fn declare_anonymous_function(&mut self, signature: &ir::Signature) -> ModuleResult<FuncId> { |
| let id = self.declarations.declare_anonymous_function(signature)?; |
| |
| let symbol_id = self.object.add_symbol(Symbol { |
| name: self |
| .declarations |
| .get_function_decl(id) |
| .linkage_name(id) |
| .into_owned() |
| .into_bytes(), |
| value: 0, |
| size: 0, |
| kind: SymbolKind::Text, |
| scope: SymbolScope::Compilation, |
| weak: false, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }); |
| self.functions[id] = Some((symbol_id, false)); |
| |
| Ok(id) |
| } |
| |
| fn declare_data( |
| &mut self, |
| name: &str, |
| linkage: Linkage, |
| writable: bool, |
| tls: bool, |
| ) -> ModuleResult<DataId> { |
| validate_symbol(name)?; |
| |
| let (id, linkage) = self |
| .declarations |
| .declare_data(name, linkage, writable, tls)?; |
| |
| // Merging declarations with conflicting values for tls is not allowed, so it is safe to use |
| // the passed in tls value here. |
| let kind = if tls { |
| SymbolKind::Tls |
| } else { |
| SymbolKind::Data |
| }; |
| let (scope, weak) = translate_linkage(linkage); |
| |
| if let Some((data, _defined)) = self.data_objects[id] { |
| let symbol = self.object.symbol_mut(data); |
| symbol.kind = kind; |
| symbol.scope = scope; |
| symbol.weak = weak; |
| } else { |
| let symbol_id = self.object.add_symbol(Symbol { |
| name: name.as_bytes().to_vec(), |
| value: 0, |
| size: 0, |
| kind, |
| scope, |
| weak, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }); |
| self.data_objects[id] = Some((symbol_id, false)); |
| } |
| |
| Ok(id) |
| } |
| |
| fn declare_anonymous_data(&mut self, writable: bool, tls: bool) -> ModuleResult<DataId> { |
| let id = self.declarations.declare_anonymous_data(writable, tls)?; |
| |
| let kind = if tls { |
| SymbolKind::Tls |
| } else { |
| SymbolKind::Data |
| }; |
| |
| let symbol_id = self.object.add_symbol(Symbol { |
| name: self |
| .declarations |
| .get_data_decl(id) |
| .linkage_name(id) |
| .into_owned() |
| .into_bytes(), |
| value: 0, |
| size: 0, |
| kind, |
| scope: SymbolScope::Compilation, |
| weak: false, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }); |
| self.data_objects[id] = Some((symbol_id, false)); |
| |
| Ok(id) |
| } |
| |
| fn define_function_with_control_plane( |
| &mut self, |
| func_id: FuncId, |
| ctx: &mut cranelift_codegen::Context, |
| ctrl_plane: &mut ControlPlane, |
| ) -> ModuleResult<()> { |
| info!("defining function {}: {}", func_id, ctx.func.display()); |
| let mut code: Vec<u8> = Vec::new(); |
| |
| let res = ctx.compile_and_emit(self.isa(), &mut code, ctrl_plane)?; |
| let alignment = res.buffer.alignment as u64; |
| |
| self.define_function_bytes( |
| func_id, |
| &ctx.func, |
| alignment, |
| &code, |
| ctx.compiled_code().unwrap().buffer.relocs(), |
| ) |
| } |
| |
| fn define_function_bytes( |
| &mut self, |
| func_id: FuncId, |
| func: &ir::Function, |
| alignment: u64, |
| bytes: &[u8], |
| relocs: &[MachReloc], |
| ) -> ModuleResult<()> { |
| info!("defining function {} with bytes", func_id); |
| let decl = self.declarations.get_function_decl(func_id); |
| if !decl.linkage.is_definable() { |
| return Err(ModuleError::InvalidImportDefinition( |
| decl.linkage_name(func_id).into_owned(), |
| )); |
| } |
| |
| let &mut (symbol, ref mut defined) = self.functions[func_id].as_mut().unwrap(); |
| if *defined { |
| return Err(ModuleError::DuplicateDefinition( |
| decl.linkage_name(func_id).into_owned(), |
| )); |
| } |
| *defined = true; |
| |
| let align = alignment |
| .max(self.isa.function_alignment().minimum.into()) |
| .max(self.isa.symbol_alignment()); |
| let (section, offset) = if self.per_function_section { |
| let symbol_name = self.object.symbol(symbol).name.clone(); |
| let (section, offset) = |
| self.object |
| .add_subsection(StandardSection::Text, &symbol_name, bytes, align); |
| self.object.symbol_mut(symbol).section = SymbolSection::Section(section); |
| self.object.symbol_mut(symbol).value = offset; |
| (section, offset) |
| } else { |
| let section = self.object.section_id(StandardSection::Text); |
| let offset = self.object.add_symbol_data(symbol, section, bytes, align); |
| (section, offset) |
| }; |
| |
| if !relocs.is_empty() { |
| let relocs = relocs |
| .iter() |
| .map(|record| self.process_reloc(&ModuleReloc::from_mach_reloc(&record, func))) |
| .collect(); |
| self.relocs.push(SymbolRelocs { |
| section, |
| offset, |
| relocs, |
| }); |
| } |
| |
| Ok(()) |
| } |
| |
| fn define_data(&mut self, data_id: DataId, data: &DataDescription) -> ModuleResult<()> { |
| let decl = self.declarations.get_data_decl(data_id); |
| if !decl.linkage.is_definable() { |
| return Err(ModuleError::InvalidImportDefinition( |
| decl.linkage_name(data_id).into_owned(), |
| )); |
| } |
| |
| let &mut (symbol, ref mut defined) = self.data_objects[data_id].as_mut().unwrap(); |
| if *defined { |
| return Err(ModuleError::DuplicateDefinition( |
| decl.linkage_name(data_id).into_owned(), |
| )); |
| } |
| *defined = true; |
| |
| let &DataDescription { |
| ref init, |
| function_decls: _, |
| data_decls: _, |
| function_relocs: _, |
| data_relocs: _, |
| ref custom_segment_section, |
| align, |
| } = data; |
| |
| let pointer_reloc = match self.isa.triple().pointer_width().unwrap() { |
| PointerWidth::U16 => unimplemented!("16bit pointers"), |
| PointerWidth::U32 => Reloc::Abs4, |
| PointerWidth::U64 => Reloc::Abs8, |
| }; |
| let relocs = data |
| .all_relocs(pointer_reloc) |
| .map(|record| self.process_reloc(&record)) |
| .collect::<Vec<_>>(); |
| |
| let section = if custom_segment_section.is_none() { |
| let section_kind = if let Init::Zeros { .. } = *init { |
| if decl.tls { |
| StandardSection::UninitializedTls |
| } else { |
| StandardSection::UninitializedData |
| } |
| } else if decl.tls { |
| StandardSection::Tls |
| } else if decl.writable { |
| StandardSection::Data |
| } else if relocs.is_empty() { |
| StandardSection::ReadOnlyData |
| } else { |
| StandardSection::ReadOnlyDataWithRel |
| }; |
| self.object.section_id(section_kind) |
| } else { |
| if decl.tls { |
| return Err(cranelift_module::ModuleError::Backend(anyhow::anyhow!( |
| "Custom section not supported for TLS" |
| ))); |
| } |
| let (seg, sec) = &custom_segment_section.as_ref().unwrap(); |
| self.object.add_section( |
| seg.clone().into_bytes(), |
| sec.clone().into_bytes(), |
| if decl.writable { |
| SectionKind::Data |
| } else if relocs.is_empty() { |
| SectionKind::ReadOnlyData |
| } else { |
| SectionKind::ReadOnlyDataWithRel |
| }, |
| ) |
| }; |
| |
| let align = std::cmp::max(align.unwrap_or(1), self.isa.symbol_alignment()); |
| let offset = match *init { |
| Init::Uninitialized => { |
| panic!("data is not initialized yet"); |
| } |
| Init::Zeros { size } => self |
| .object |
| .add_symbol_bss(symbol, section, size as u64, align), |
| Init::Bytes { ref contents } => self |
| .object |
| .add_symbol_data(symbol, section, &contents, align), |
| }; |
| if !relocs.is_empty() { |
| self.relocs.push(SymbolRelocs { |
| section, |
| offset, |
| relocs, |
| }); |
| } |
| Ok(()) |
| } |
| } |
| |
| impl ObjectModule { |
| /// Finalize all relocations and output an object. |
| pub fn finish(mut self) -> ObjectProduct { |
| let symbol_relocs = mem::take(&mut self.relocs); |
| for symbol in symbol_relocs { |
| for &ObjectRelocRecord { |
| offset, |
| ref name, |
| kind, |
| encoding, |
| size, |
| addend, |
| } in &symbol.relocs |
| { |
| let target_symbol = self.get_symbol(name); |
| self.object |
| .add_relocation( |
| symbol.section, |
| Relocation { |
| offset: symbol.offset + u64::from(offset), |
| size, |
| kind, |
| encoding, |
| symbol: target_symbol, |
| addend, |
| }, |
| ) |
| .unwrap(); |
| } |
| } |
| |
| // Indicate that this object has a non-executable stack. |
| if self.object.format() == object::BinaryFormat::Elf { |
| self.object.add_section( |
| vec![], |
| ".note.GNU-stack".as_bytes().to_vec(), |
| SectionKind::Linker, |
| ); |
| } |
| |
| ObjectProduct { |
| object: self.object, |
| functions: self.functions, |
| data_objects: self.data_objects, |
| } |
| } |
| |
| /// This should only be called during finish because it creates |
| /// symbols for missing libcalls. |
| fn get_symbol(&mut self, name: &ModuleExtName) -> SymbolId { |
| match *name { |
| ModuleExtName::User { .. } => { |
| if ModuleDeclarations::is_function(name) { |
| let id = FuncId::from_name(name); |
| self.functions[id].unwrap().0 |
| } else { |
| let id = DataId::from_name(name); |
| self.data_objects[id].unwrap().0 |
| } |
| } |
| ModuleExtName::LibCall(ref libcall) => { |
| let name = (self.libcall_names)(*libcall); |
| if let Some(symbol) = self.object.symbol_id(name.as_bytes()) { |
| symbol |
| } else if let Some(symbol) = self.libcalls.get(libcall) { |
| *symbol |
| } else { |
| let symbol = self.object.add_symbol(Symbol { |
| name: name.as_bytes().to_vec(), |
| value: 0, |
| size: 0, |
| kind: SymbolKind::Text, |
| scope: SymbolScope::Unknown, |
| weak: false, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }); |
| self.libcalls.insert(*libcall, symbol); |
| symbol |
| } |
| } |
| // These are "magic" names well-known to the linker. |
| // They require special treatment. |
| ModuleExtName::KnownSymbol(ref known_symbol) => { |
| if let Some(symbol) = self.known_symbols.get(known_symbol) { |
| *symbol |
| } else { |
| let symbol = self.object.add_symbol(match known_symbol { |
| ir::KnownSymbol::ElfGlobalOffsetTable => Symbol { |
| name: b"_GLOBAL_OFFSET_TABLE_".to_vec(), |
| value: 0, |
| size: 0, |
| kind: SymbolKind::Data, |
| scope: SymbolScope::Unknown, |
| weak: false, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }, |
| ir::KnownSymbol::CoffTlsIndex => Symbol { |
| name: b"_tls_index".to_vec(), |
| value: 0, |
| size: 32, |
| kind: SymbolKind::Tls, |
| scope: SymbolScope::Unknown, |
| weak: false, |
| section: SymbolSection::Undefined, |
| flags: SymbolFlags::None, |
| }, |
| }); |
| self.known_symbols.insert(*known_symbol, symbol); |
| symbol |
| } |
| } |
| } |
| } |
| |
| fn process_reloc(&self, record: &ModuleReloc) -> ObjectRelocRecord { |
| let mut addend = record.addend; |
| let (kind, encoding, size) = match record.kind { |
| Reloc::Abs4 => (RelocationKind::Absolute, RelocationEncoding::Generic, 32), |
| Reloc::Abs8 => (RelocationKind::Absolute, RelocationEncoding::Generic, 64), |
| Reloc::X86PCRel4 => (RelocationKind::Relative, RelocationEncoding::Generic, 32), |
| Reloc::X86CallPCRel4 => (RelocationKind::Relative, RelocationEncoding::X86Branch, 32), |
| // TODO: Get Cranelift to tell us when we can use |
| // R_X86_64_GOTPCRELX/R_X86_64_REX_GOTPCRELX. |
| Reloc::X86CallPLTRel4 => ( |
| RelocationKind::PltRelative, |
| RelocationEncoding::X86Branch, |
| 32, |
| ), |
| Reloc::X86SecRel => ( |
| RelocationKind::SectionOffset, |
| RelocationEncoding::Generic, |
| 32, |
| ), |
| Reloc::X86GOTPCRel4 => (RelocationKind::GotRelative, RelocationEncoding::Generic, 32), |
| Reloc::Arm64Call => ( |
| RelocationKind::Relative, |
| RelocationEncoding::AArch64Call, |
| 26, |
| ), |
| Reloc::ElfX86_64TlsGd => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::Elf, |
| "ElfX86_64TlsGd is not supported for this file format" |
| ); |
| ( |
| RelocationKind::Elf(object::elf::R_X86_64_TLSGD), |
| RelocationEncoding::Generic, |
| 32, |
| ) |
| } |
| Reloc::MachOX86_64Tlv => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::MachO, |
| "MachOX86_64Tlv is not supported for this file format" |
| ); |
| addend += 4; // X86_64_RELOC_TLV has an implicit addend of -4 |
| ( |
| RelocationKind::MachO { |
| value: object::macho::X86_64_RELOC_TLV, |
| relative: true, |
| }, |
| RelocationEncoding::Generic, |
| 32, |
| ) |
| } |
| Reloc::MachOAarch64TlsAdrPage21 => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::MachO, |
| "MachOAarch64TlsAdrPage21 is not supported for this file format" |
| ); |
| ( |
| RelocationKind::MachO { |
| value: object::macho::ARM64_RELOC_TLVP_LOAD_PAGE21, |
| relative: true, |
| }, |
| RelocationEncoding::Generic, |
| 21, |
| ) |
| } |
| Reloc::MachOAarch64TlsAdrPageOff12 => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::MachO, |
| "MachOAarch64TlsAdrPageOff12 is not supported for this file format" |
| ); |
| ( |
| RelocationKind::MachO { |
| value: object::macho::ARM64_RELOC_TLVP_LOAD_PAGEOFF12, |
| relative: false, |
| }, |
| RelocationEncoding::Generic, |
| 12, |
| ) |
| } |
| Reloc::Aarch64TlsGdAdrPage21 => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::Elf, |
| "Aarch64TlsGdAdrPrel21 is not supported for this file format" |
| ); |
| ( |
| RelocationKind::Elf(object::elf::R_AARCH64_TLSGD_ADR_PAGE21), |
| RelocationEncoding::Generic, |
| 21, |
| ) |
| } |
| Reloc::Aarch64TlsGdAddLo12Nc => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::Elf, |
| "Aarch64TlsGdAddLo12Nc is not supported for this file format" |
| ); |
| ( |
| RelocationKind::Elf(object::elf::R_AARCH64_TLSGD_ADD_LO12_NC), |
| RelocationEncoding::Generic, |
| 12, |
| ) |
| } |
| Reloc::Aarch64AdrGotPage21 => match self.object.format() { |
| object::BinaryFormat::Elf => ( |
| RelocationKind::Elf(object::elf::R_AARCH64_ADR_GOT_PAGE), |
| RelocationEncoding::Generic, |
| 21, |
| ), |
| object::BinaryFormat::MachO => ( |
| RelocationKind::MachO { |
| value: object::macho::ARM64_RELOC_GOT_LOAD_PAGE21, |
| relative: true, |
| }, |
| RelocationEncoding::Generic, |
| 21, |
| ), |
| _ => unimplemented!("Aarch64AdrGotPage21 is not supported for this file format"), |
| }, |
| Reloc::Aarch64Ld64GotLo12Nc => match self.object.format() { |
| object::BinaryFormat::Elf => ( |
| RelocationKind::Elf(object::elf::R_AARCH64_LD64_GOT_LO12_NC), |
| RelocationEncoding::Generic, |
| 12, |
| ), |
| object::BinaryFormat::MachO => ( |
| RelocationKind::MachO { |
| value: object::macho::ARM64_RELOC_GOT_LOAD_PAGEOFF12, |
| relative: false, |
| }, |
| RelocationEncoding::Generic, |
| 12, |
| ), |
| _ => unimplemented!("Aarch64Ld64GotLo12Nc is not supported for this file format"), |
| }, |
| Reloc::S390xPCRel32Dbl => (RelocationKind::Relative, RelocationEncoding::S390xDbl, 32), |
| Reloc::S390xPLTRel32Dbl => ( |
| RelocationKind::PltRelative, |
| RelocationEncoding::S390xDbl, |
| 32, |
| ), |
| Reloc::S390xTlsGd64 => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::Elf, |
| "S390xTlsGd64 is not supported for this file format" |
| ); |
| ( |
| RelocationKind::Elf(object::elf::R_390_TLS_GD64), |
| RelocationEncoding::Generic, |
| 64, |
| ) |
| } |
| Reloc::S390xTlsGdCall => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::Elf, |
| "S390xTlsGdCall is not supported for this file format" |
| ); |
| ( |
| RelocationKind::Elf(object::elf::R_390_TLS_GDCALL), |
| RelocationEncoding::Generic, |
| 0, |
| ) |
| } |
| Reloc::RiscvCall => { |
| assert_eq!( |
| self.object.format(), |
| object::BinaryFormat::Elf, |
| "RiscvCall is not supported for this file format" |
| ); |
| ( |
| RelocationKind::Elf(object::elf::R_RISCV_CALL), |
| RelocationEncoding::Generic, |
| 0, |
| ) |
| } |
| // FIXME |
| reloc => unimplemented!("{:?}", reloc), |
| }; |
| |
| ObjectRelocRecord { |
| offset: record.offset, |
| name: record.name.clone(), |
| kind, |
| encoding, |
| size, |
| addend, |
| } |
| } |
| } |
| |
| fn translate_linkage(linkage: Linkage) -> (SymbolScope, bool) { |
| let scope = match linkage { |
| Linkage::Import => SymbolScope::Unknown, |
| Linkage::Local => SymbolScope::Compilation, |
| Linkage::Hidden => SymbolScope::Linkage, |
| Linkage::Export | Linkage::Preemptible => SymbolScope::Dynamic, |
| }; |
| // TODO: this matches rustc_codegen_cranelift, but may be wrong. |
| let weak = linkage == Linkage::Preemptible; |
| (scope, weak) |
| } |
| |
| /// This is the output of `ObjectModule`'s |
| /// [`finish`](../struct.ObjectModule.html#method.finish) function. |
| /// It contains the generated `Object` and other information produced during |
| /// compilation. |
| pub struct ObjectProduct { |
| /// Object artifact with all functions and data from the module defined. |
| pub object: Object<'static>, |
| /// Symbol IDs for functions (both declared and defined). |
| pub functions: SecondaryMap<FuncId, Option<(SymbolId, bool)>>, |
| /// Symbol IDs for data objects (both declared and defined). |
| pub data_objects: SecondaryMap<DataId, Option<(SymbolId, bool)>>, |
| } |
| |
| impl ObjectProduct { |
| /// Return the `SymbolId` for the given function. |
| #[inline] |
| pub fn function_symbol(&self, id: FuncId) -> SymbolId { |
| self.functions[id].unwrap().0 |
| } |
| |
| /// Return the `SymbolId` for the given data object. |
| #[inline] |
| pub fn data_symbol(&self, id: DataId) -> SymbolId { |
| self.data_objects[id].unwrap().0 |
| } |
| |
| /// Write the object bytes in memory. |
| #[inline] |
| pub fn emit(self) -> Result<Vec<u8>, object::write::Error> { |
| self.object.write() |
| } |
| } |
| |
| #[derive(Clone)] |
| struct SymbolRelocs { |
| section: SectionId, |
| offset: u64, |
| relocs: Vec<ObjectRelocRecord>, |
| } |
| |
| #[derive(Clone)] |
| struct ObjectRelocRecord { |
| offset: CodeOffset, |
| name: ModuleExtName, |
| kind: RelocationKind, |
| encoding: RelocationEncoding, |
| size: u8, |
| addend: Addend, |
| } |
