Struct rustc_metadata::rmeta::CrateRoot

pub(crate) struct CrateRoot {

    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, FeatureStability)>,
    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,
    specialization_enabled_in: bool,
}

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:

1. 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.
2. We avoid serializing invalid CrateNums. 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 foreign CrateNums 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, FeatureStability)>

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

specialization_enabled_in: bool

Implementations

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

impl<'tcx, '__a> Decodable<DecodeContext<'__a, 'tcx>> for CrateRoot

fn decode(__decoder: &mut DecodeContext<'__a, 'tcx>) -> Self

impl<'tcx, '__a> Encodable<EncodeContext<'__a, 'tcx>> for CrateRoot

fn encode(&self, __encoder: &mut EncodeContext<'__a, 'tcx>)

impl ParameterizedOverTcx for CrateRoot

type Value<'tcx> = CrateRoot

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: 2296 bytes