add backend trait method

Author: tinaun

src/librustc_codegen_llvm/lib.rs

@@ -90,6 +90,14 @@ impl ExtraBackendMethods for LlvmCodegenBackend {
     ) {
         base::write_compressed_metadata(tcx, metadata, llvm_module)
     }
+    fn write_idata_sections<'tcx>(
+        &self,
+        tcx: TyCtxt<'tcx>,
+        raw_dylibs: &[RawDylibImports],
+        module: &mut ModuleLlvm,
+    ){
+        base::write_idata_sections(tcx, raw_dylibs, module)
+    }
     fn codegen_allocator<'tcx>(
         &self,
         tcx: TyCtxt<'tcx>,

src/librustc_codegen_ssa/traits/backend.rs

@@ -89,6 +89,20 @@ pub trait CodegenBackend {
     ) -> Result<(), ErrorReported>;
 }
 
+//TODO: Put this somewhere else?
+#[derive(Debug)]
+pub enum RawDylibImportName {
+    Name(Symbol),
+    Ordinal(u16),
+}
+
+#[derive(Debug)]
+pub struct RawDylibImports {
+    pub name: Symbol,
+    pub items: Vec<RawDylibImportName>
+}
+
+
 pub trait ExtraBackendMethods: CodegenBackend + WriteBackendMethods + Sized + Send + Sync {
     fn new_metadata(&self, sess: TyCtxt<'_>, mod_name: &str) -> Self::Module;
     fn write_compressed_metadata<'tcx>(
@@ -97,6 +111,12 @@ pub trait ExtraBackendMethods: CodegenBackend + WriteBackendMethods + Sized + Se
         metadata: &EncodedMetadata,
         llvm_module: &mut Self::Module,
     );
+    fn write_idata_sections<'tcx>(
+        &self,
+        tcx: TyCtxt<'tcx>,
+        raw_dylib_imports: &[RawDylibImports],
+        mods: &mut Self::Module,
+    );
     fn codegen_allocator<'tcx>(
         &self,
         tcx: TyCtxt<'tcx>,

src/librustc_codegen_ssa/traits/mod.rs

@@ -30,6 +30,7 @@ mod write;
 pub use self::abi::AbiBuilderMethods;
 pub use self::asm::{AsmBuilderMethods, AsmMethods, InlineAsmOperandRef};
 pub use self::backend::{Backend, BackendTypes, CodegenBackend, ExtraBackendMethods};
+pub use self::backend::{RawDylibImports, RawDylibImportName};
 pub use self::builder::{BuilderMethods, OverflowOp};
 pub use self::consts::ConstMethods;
 pub use self::debuginfo::{DebugInfoBuilderMethods, DebugInfoMethods};