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comdat.rs
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comdat.rs
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//! A `Comdat` helps resolve linker errors for duplicate sections.
// https://llvm.org/doxygen/IR_2Comdat_8h_source.html
// https://stackoverflow.com/questions/1834597/what-is-the-comdat-section-used-for
use llvm_sys::comdat::{LLVMComdatSelectionKind, LLVMGetComdatSelectionKind, LLVMSetComdatSelectionKind};
use llvm_sys::prelude::LLVMComdatRef;
#[llvm_enum(LLVMComdatSelectionKind)]
#[derive(Clone, Copy, Debug, Eq, Hash, Ord, PartialEq, PartialOrd)]
/// Determines how linker conflicts are to be resolved.
pub enum ComdatSelectionKind {
/// The linker may choose any COMDAT.
#[llvm_variant(LLVMAnyComdatSelectionKind)]
Any,
/// The data referenced by the COMDAT must be the same.
#[llvm_variant(LLVMExactMatchComdatSelectionKind)]
ExactMatch,
/// The linker will choose the largest COMDAT.
#[llvm_variant(LLVMLargestComdatSelectionKind)]
Largest,
/// No other Module may specify this COMDAT.
#[llvm_variant(LLVMNoDuplicatesComdatSelectionKind)]
NoDuplicates,
/// The data referenced by the COMDAT must be the same size.
#[llvm_variant(LLVMSameSizeComdatSelectionKind)]
SameSize,
}
/// A `Comdat` determines how to resolve duplicate sections when linking.
#[derive(Debug, PartialEq, Eq, Copy, Clone)]
pub struct Comdat(pub(crate) LLVMComdatRef);
impl Comdat {
/// Creates a new `Comdat` type from a raw pointer.
pub unsafe fn new(comdat: LLVMComdatRef) -> Self {
debug_assert!(!comdat.is_null());
Comdat(comdat)
}
/// Acquires the underlying raw pointer belonging to this `Comdat` type.
pub fn as_mut_ptr(&self) -> LLVMComdatRef {
self.0
}
/// Gets what kind of `Comdat` this is.
pub fn get_selection_kind(self) -> ComdatSelectionKind {
let kind_ptr = unsafe { LLVMGetComdatSelectionKind(self.0) };
ComdatSelectionKind::new(kind_ptr)
}
/// Sets what kind of `Comdat` this should be.
pub fn set_selection_kind(self, kind: ComdatSelectionKind) {
unsafe { LLVMSetComdatSelectionKind(self.0, kind.into()) }
}
}