73 lines
2.4 KiB
Rust
73 lines
2.4 KiB
Rust
use crate::ty::subst::SubstsRef;
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use crate::ty::{self, Ty, TyCtxt};
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use rustc_hir::def_id::{DefId, LOCAL_CRATE};
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use rustc_macros::HashStable;
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/// The SymbolExportLevel of a symbols specifies from which kinds of crates
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/// the symbol will be exported. `C` symbols will be exported from any
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/// kind of crate, including cdylibs which export very few things.
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/// `Rust` will only be exported if the crate produced is a Rust
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/// dylib.
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#[derive(Eq, PartialEq, Debug, Copy, Clone, TyEncodable, TyDecodable, HashStable)]
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pub enum SymbolExportLevel {
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C,
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Rust,
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}
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impl SymbolExportLevel {
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pub fn is_below_threshold(self, threshold: SymbolExportLevel) -> bool {
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threshold == SymbolExportLevel::Rust // export everything from Rust dylibs
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|| self == SymbolExportLevel::C
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}
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}
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/// Kind of exported symbols.
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#[derive(Eq, PartialEq, Debug, Copy, Clone, Encodable, Decodable, HashStable)]
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pub enum SymbolExportKind {
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Text,
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Data,
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Tls,
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}
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/// The `SymbolExportInfo` of a symbols specifies symbol-related information
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/// that is relevant to code generation and linking.
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#[derive(Eq, PartialEq, Debug, Copy, Clone, TyEncodable, TyDecodable, HashStable)]
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pub struct SymbolExportInfo {
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pub level: SymbolExportLevel,
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pub kind: SymbolExportKind,
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pub used: bool,
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}
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#[derive(Eq, PartialEq, Debug, Copy, Clone, TyEncodable, TyDecodable, HashStable)]
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pub enum ExportedSymbol<'tcx> {
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NonGeneric(DefId),
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Generic(DefId, SubstsRef<'tcx>),
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DropGlue(Ty<'tcx>),
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NoDefId(ty::SymbolName<'tcx>),
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}
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impl<'tcx> ExportedSymbol<'tcx> {
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/// This is the symbol name of an instance if it is instantiated in the
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/// local crate.
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pub fn symbol_name_for_local_instance(&self, tcx: TyCtxt<'tcx>) -> ty::SymbolName<'tcx> {
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match *self {
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ExportedSymbol::NonGeneric(def_id) => tcx.symbol_name(ty::Instance::mono(tcx, def_id)),
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ExportedSymbol::Generic(def_id, substs) => {
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tcx.symbol_name(ty::Instance::new(def_id, substs))
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}
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ExportedSymbol::DropGlue(ty) => {
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tcx.symbol_name(ty::Instance::resolve_drop_in_place(tcx, ty))
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}
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ExportedSymbol::NoDefId(symbol_name) => symbol_name,
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}
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}
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}
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pub fn metadata_symbol_name(tcx: TyCtxt<'_>) -> String {
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format!(
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"rust_metadata_{}_{:08x}",
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tcx.crate_name(LOCAL_CRATE),
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tcx.sess.local_stable_crate_id().to_u64(),
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)
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}
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