Struct rustc_metadata::rmeta::CrateRoot
source · pub(crate) struct CrateRoot {Show 40 fields
header: CrateHeader,
extra_filename: String,
stable_crate_id: StableCrateId,
required_panic_strategy: Option<PanicStrategy>,
panic_in_drop_strategy: PanicStrategy,
edition: Edition,
has_global_allocator: bool,
has_alloc_error_handler: bool,
has_panic_handler: bool,
has_default_lib_allocator: bool,
crate_deps: LazyArray<CrateDep>,
dylib_dependency_formats: LazyArray<Option<LinkagePreference>>,
lib_features: LazyArray<(Symbol, Option<Symbol>)>,
stability_implications: LazyArray<(Symbol, Symbol)>,
lang_items: LazyArray<(DefIndex, LangItem)>,
lang_items_missing: LazyArray<LangItem>,
stripped_cfg_items: LazyArray<StrippedCfgItem<DefIndex>>,
diagnostic_items: LazyArray<(Symbol, DefIndex)>,
native_libraries: LazyArray<NativeLib>,
foreign_modules: LazyArray<ForeignModule>,
traits: LazyArray<DefIndex>,
impls: LazyArray<TraitImpls>,
incoherent_impls: LazyArray<IncoherentImpls>,
interpret_alloc_index: LazyArray<u64>,
proc_macro_data: Option<ProcMacroData>,
tables: LazyTables,
debugger_visualizers: LazyArray<DebuggerVisualizerFile>,
exported_symbols: LazyArray<(ExportedSymbol<'static>, SymbolExportInfo)>,
syntax_contexts: LazyTable<u32, Option<LazyValue<SyntaxContextData>>>,
expn_data: LazyTable<ExpnIndex, Option<LazyValue<ExpnData>>>,
expn_hashes: LazyTable<ExpnIndex, Option<LazyValue<ExpnHash>>>,
def_path_hash_map: LazyValue<DefPathHashMapRef<'static>>,
source_map: LazyTable<u32, Option<LazyValue<SourceFile>>>,
compiler_builtins: bool,
needs_allocator: bool,
needs_panic_runtime: bool,
no_builtins: bool,
panic_runtime: bool,
profiler_runtime: bool,
symbol_mangling_version: SymbolManglingVersion,
}
Expand description
Serialized .rmeta
data for a crate.
When compiling a proc-macro crate, we encode many of
the LazyArray<T>
fields as Lazy::empty()
. This serves two purposes:
- We avoid performing unnecessary work. Proc-macro crates can only export proc-macros functions, which are compiled into a shared library. As a result, a large amount of the information we normally store (e.g. optimized MIR) is unneeded by downstream crates.
- We avoid serializing invalid
CrateNum
s. When we deserialize a proc-macro crate, we don’t load any of its dependencies (since we just need to invoke a native function from the shared library). This means that any foreignCrateNum
s that we serialize cannot be deserialized, since we will not know how to map them into the current compilation session. If we were to serialize a proc-macro crate like a normal crate, much of what we serialized would be unusable in addition to being unused.
Fields§
§header: CrateHeader
A header used to detect if this is the right crate to load.
extra_filename: String
§stable_crate_id: StableCrateId
§required_panic_strategy: Option<PanicStrategy>
§panic_in_drop_strategy: PanicStrategy
§edition: Edition
§has_global_allocator: bool
§has_alloc_error_handler: bool
§has_panic_handler: bool
§has_default_lib_allocator: bool
§crate_deps: LazyArray<CrateDep>
§dylib_dependency_formats: LazyArray<Option<LinkagePreference>>
§lib_features: LazyArray<(Symbol, Option<Symbol>)>
§stability_implications: LazyArray<(Symbol, Symbol)>
§lang_items: LazyArray<(DefIndex, LangItem)>
§lang_items_missing: LazyArray<LangItem>
§stripped_cfg_items: LazyArray<StrippedCfgItem<DefIndex>>
§diagnostic_items: LazyArray<(Symbol, DefIndex)>
§native_libraries: LazyArray<NativeLib>
§foreign_modules: LazyArray<ForeignModule>
§traits: LazyArray<DefIndex>
§impls: LazyArray<TraitImpls>
§incoherent_impls: LazyArray<IncoherentImpls>
§interpret_alloc_index: LazyArray<u64>
§proc_macro_data: Option<ProcMacroData>
§tables: LazyTables
§debugger_visualizers: LazyArray<DebuggerVisualizerFile>
§exported_symbols: LazyArray<(ExportedSymbol<'static>, SymbolExportInfo)>
§syntax_contexts: LazyTable<u32, Option<LazyValue<SyntaxContextData>>>
§expn_data: LazyTable<ExpnIndex, Option<LazyValue<ExpnData>>>
§expn_hashes: LazyTable<ExpnIndex, Option<LazyValue<ExpnHash>>>
§def_path_hash_map: LazyValue<DefPathHashMapRef<'static>>
§source_map: LazyTable<u32, Option<LazyValue<SourceFile>>>
§compiler_builtins: bool
§needs_allocator: bool
§needs_panic_runtime: bool
§no_builtins: bool
§panic_runtime: bool
§profiler_runtime: bool
§symbol_mangling_version: SymbolManglingVersion
Implementations§
source§impl CrateRoot
impl CrateRoot
pub(crate) fn is_proc_macro_crate(&self) -> bool
pub(crate) fn name(&self) -> Symbol
pub(crate) fn hash(&self) -> Svh
pub(crate) fn stable_crate_id(&self) -> StableCrateId
pub(crate) fn decode_crate_deps<'a>( &self, metadata: &'a MetadataBlob ) -> impl ExactSizeIterator<Item = CrateDep> + Captures<'a>
Trait Implementations§
source§impl<'tcx, '__a> Decodable<DecodeContext<'__a, 'tcx>> for CrateRoot
impl<'tcx, '__a> Decodable<DecodeContext<'__a, 'tcx>> for CrateRoot
fn decode(__decoder: &mut DecodeContext<'__a, 'tcx>) -> Self
source§impl<'tcx, '__a> Encodable<EncodeContext<'__a, 'tcx>> for CrateRoot
impl<'tcx, '__a> Encodable<EncodeContext<'__a, 'tcx>> for CrateRoot
fn encode(&self, __encoder: &mut EncodeContext<'__a, 'tcx>)
Auto Trait Implementations§
impl RefUnwindSafe for CrateRoot
impl Send for CrateRoot
impl Sync for CrateRoot
impl Unpin for CrateRoot
impl UnwindSafe for CrateRoot
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
Layout§
Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...)
attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.
Size: 2152 bytes