85 lines
2.9 KiB
Rust
85 lines
2.9 KiB
Rust
use crate::abi::FnAbi;
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use crate::attributes;
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use crate::base;
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use crate::context::CodegenCx;
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use crate::llvm;
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use crate::type_of::LayoutLlvmExt;
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use rustc_codegen_ssa::traits::*;
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use rustc_hir::def_id::{DefId, LOCAL_CRATE};
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pub use rustc_middle::mir::mono::MonoItem;
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use rustc_middle::mir::mono::{Linkage, Visibility};
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use rustc_middle::ty::layout::FnAbiExt;
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use rustc_middle::ty::{self, Instance, TypeFoldable};
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use rustc_target::abi::LayoutOf;
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use tracing::debug;
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impl PreDefineMethods<'tcx> for CodegenCx<'ll, 'tcx> {
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fn predefine_static(
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&self,
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def_id: DefId,
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linkage: Linkage,
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visibility: Visibility,
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symbol_name: &str,
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) {
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let instance = Instance::mono(self.tcx, def_id);
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let ty = instance.ty(self.tcx, ty::ParamEnv::reveal_all());
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let llty = self.layout_of(ty).llvm_type(self);
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let g = self.define_global(symbol_name, llty).unwrap_or_else(|| {
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self.sess().span_fatal(
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self.tcx.def_span(def_id),
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&format!("symbol `{}` is already defined", symbol_name),
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)
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});
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unsafe {
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llvm::LLVMRustSetLinkage(g, base::linkage_to_llvm(linkage));
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llvm::LLVMRustSetVisibility(g, base::visibility_to_llvm(visibility));
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}
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self.instances.borrow_mut().insert(instance, g);
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}
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fn predefine_fn(
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&self,
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instance: Instance<'tcx>,
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linkage: Linkage,
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visibility: Visibility,
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symbol_name: &str,
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) {
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assert!(!instance.substs.needs_infer());
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let fn_abi = FnAbi::of_instance(self, instance, &[]);
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let lldecl = self.declare_fn(symbol_name, &fn_abi);
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unsafe { llvm::LLVMRustSetLinkage(lldecl, base::linkage_to_llvm(linkage)) };
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let attrs = self.tcx.codegen_fn_attrs(instance.def_id());
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base::set_link_section(lldecl, &attrs);
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if linkage == Linkage::LinkOnceODR || linkage == Linkage::WeakODR {
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llvm::SetUniqueComdat(self.llmod, lldecl);
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}
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// If we're compiling the compiler-builtins crate, e.g., the equivalent of
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// compiler-rt, then we want to implicitly compile everything with hidden
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// visibility as we're going to link this object all over the place but
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// don't want the symbols to get exported.
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if linkage != Linkage::Internal
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&& linkage != Linkage::Private
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&& self.tcx.is_compiler_builtins(LOCAL_CRATE)
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{
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unsafe {
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llvm::LLVMRustSetVisibility(lldecl, llvm::Visibility::Hidden);
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}
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} else {
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unsafe {
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llvm::LLVMRustSetVisibility(lldecl, base::visibility_to_llvm(visibility));
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}
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}
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debug!("predefine_fn: instance = {:?}", instance);
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attributes::from_fn_attrs(self, lldecl, instance);
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self.instances.borrow_mut().insert(instance, lldecl);
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}
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}
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