bjoernager/rust
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Declare main as visibility hidden on targets that default to hidden.

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On targets with `default_hidden_visibility` set, which is currrently
just WebAssembly, declare the generated `main` function with visibility
hidden. This makes it consistent with clang's WebAssembly target, where
`main` is just a user function that gets the same visibility as any
other user function, which is hidden on WebAssembly unless explicitly
overridden.

This will help simplify use cases which in the future may want to
automatically wasm-export all visibility-"default" symbols. `main` isn't
intended to be wasm-exported, and marking it hidden prevents it from
being wasm-exported in that scenario.
This commit is contained in:
Dan Gohman 2022-09-28 10:42:30 -07:00
parent 09ae7846a2
commit 3c3bf76ce0
5 changed files with 46 additions and 9 deletions
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6
compiler/rustc_codegen_llvm/src/declare.rs
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@ -32,6 +32,7 @@ fn declare_raw_fn<'ll>(
name: &str,
callconv: llvm::CallConv,
unnamed: llvm::UnnamedAddr,
visibility: llvm::Visibility,
ty: &'ll Type,
) -> &'ll Value {
debug!("declare_raw_fn(name={:?}, ty={:?})", name, ty);
@ -41,6 +42,7 @@ fn declare_raw_fn<'ll>(
llvm::SetFunctionCallConv(llfn, callconv);
llvm::SetUnnamedAddress(llfn, unnamed);
llvm::SetVisibility(llfn, visibility);
let mut attrs = SmallVec::<[_; 4]>::new();
@ -76,9 +78,10 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
&self,
name: &str,
unnamed: llvm::UnnamedAddr,
visibility: llvm::Visibility,
fn_type: &'ll Type,
) -> &'ll Value {
declare_raw_fn(self, name, llvm::CCallConv, unnamed, fn_type)
declare_raw_fn(self, name, llvm::CCallConv, unnamed, visibility, fn_type)
}
/// Declare a Rust function.
@ -95,6 +98,7 @@ impl<'ll, 'tcx> CodegenCx<'ll, 'tcx> {
name,
fn_abi.llvm_cconv(),
llvm::UnnamedAddr::Global,
llvm::Visibility::Default,
fn_abi.llvm_type(self),
);
fn_abi.apply_attrs_llfn(self, llfn);