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Add unstable -Z direct-access-external-data cmdline flag for rustc

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The new flag has been described in the Major Change Proposal at
https://github.com/rust-lang/compiler-team/issues/707
This commit is contained in:
WANG Rui 2023-12-14 22:07:53 +08:00
parent 94807670a6
commit 06a41687b1
8 changed files with 74 additions and 10 deletions
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25
compiler/rustc_codegen_llvm/src/mono_item.rs
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@ -123,6 +123,17 @@ impl CodegenCx<'_, '_> {
return false;
}
// Match clang by only supporting COFF and ELF for now.
if self.tcx.sess.target.is_like_osx {
return false;
}
// With pie relocation model calls of functions defined in the translation
// unit can use copy relocations.
if self.tcx.sess.relocation_model() == RelocModel::Pie && !is_declaration {
return true;
}
// Thread-local variables generally don't support copy relocations.
let is_thread_local_var = llvm::LLVMIsAGlobalVariable(llval)
.is_some_and(|v| llvm::LLVMIsThreadLocal(v) == llvm::True);
@ -130,18 +141,12 @@ impl CodegenCx<'_, '_> {
return false;
}
// Match clang by only supporting COFF and ELF for now.
if self.tcx.sess.target.is_like_osx {
return false;
// Respect the direct-access-external-data to override default behavior if present.
if let Some(direct) = self.tcx.sess.direct_access_external_data() {
return direct;
}
// Static relocation model should force copy relocations everywhere.
if self.tcx.sess.relocation_model() == RelocModel::Static {
return true;
}
// With pie relocation model calls of functions defined in the translation
// unit can use copy relocations.
self.tcx.sess.relocation_model() == RelocModel::Pie && !is_declaration
self.tcx.sess.relocation_model() == RelocModel::Static
}
}