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Rollup merge of #89025 - ricobbe:raw-dylib-link-ordinal, r=michaelwoerister

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Implement `#[link_ordinal(n)]`

Allows the use of `#[link_ordinal(n)]` with `#[link(kind = "raw-dylib")]`, allowing Rust to link against DLLs that export symbols by ordinal rather than by name.  As long as the ordinal matches, the name of the function in Rust is not required to match the name of the corresponding function in the exporting DLL.

Part of #58713.
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Jubilee 2021-10-07 20:26:11 -07:00 • committed by GitHub
commit 6c17601a2e
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20 changed files with 201 additions and 23 deletions
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11
compiler/rustc_codegen_llvm/src/llvm/ffi.rs
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@ -34,11 +34,18 @@ pub enum LLVMRustResult {
#[repr(C)]
pub struct LLVMRustCOFFShortExport {
pub name: *const c_char,
pub ordinal_present: bool,
// value of `ordinal` only important when `ordinal_present` is true
pub ordinal: u16,
}
impl LLVMRustCOFFShortExport {
pub fn from_name(name: *const c_char) -> LLVMRustCOFFShortExport {
LLVMRustCOFFShortExport { name }
pub fn new(name: *const c_char, ordinal: Option<u16>) -> LLVMRustCOFFShortExport {
LLVMRustCOFFShortExport {
name,
ordinal_present: ordinal.is_some(),
ordinal: ordinal.unwrap_or(0),
}
}
}