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Revert "Remove #[alloc_error_handler] from the compiler and library"

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This reverts commit abc0660118.
This commit is contained in:
Matthias Krüger 2023-04-25 00:08:35 +02:00
parent 33253fa6a4
commit f54dbe6e31
49 changed files with 842 additions and 22 deletions
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48
compiler/rustc_codegen_llvm/src/allocator.rs
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@ -4,6 +4,7 @@ use rustc_ast::expand::allocator::{AllocatorKind, AllocatorTy, ALLOCATOR_METHODS
use rustc_middle::bug;
use rustc_middle::ty::TyCtxt;
use rustc_session::config::{DebugInfo, OomStrategy};
use rustc_span::symbol::sym;
use crate::debuginfo;
use crate::llvm::{self, False, True};
@ -14,6 +15,7 @@ pub(crate) unsafe fn codegen(
module_llvm: &mut ModuleLlvm,
module_name: &str,
kind: AllocatorKind,
alloc_error_handler_kind: AllocatorKind,
) {
let llcx = &*module_llvm.llcx;
let llmod = module_llvm.llmod();
@ -98,6 +100,52 @@ pub(crate) unsafe fn codegen(
llvm::LLVMDisposeBuilder(llbuilder);
}
// rust alloc error handler
let args = [usize, usize]; // size, align
let ty = llvm::LLVMFunctionType(void, args.as_ptr(), args.len() as c_uint, False);
let name = "__rust_alloc_error_handler";
let llfn = llvm::LLVMRustGetOrInsertFunction(llmod, name.as_ptr().cast(), name.len(), ty);
// -> ! DIFlagNoReturn
let no_return = llvm::AttributeKind::NoReturn.create_attr(llcx);
attributes::apply_to_llfn(llfn, llvm::AttributePlace::Function, &[no_return]);
if tcx.sess.target.default_hidden_visibility {
llvm::LLVMRustSetVisibility(llfn, llvm::Visibility::Hidden);
}
if tcx.sess.must_emit_unwind_tables() {
let uwtable = attributes::uwtable_attr(llcx);
attributes::apply_to_llfn(llfn, llvm::AttributePlace::Function, &[uwtable]);
}
let callee = alloc_error_handler_kind.fn_name(sym::oom);
let callee = llvm::LLVMRustGetOrInsertFunction(llmod, callee.as_ptr().cast(), callee.len(), ty);
// -> ! DIFlagNoReturn
attributes::apply_to_llfn(callee, llvm::AttributePlace::Function, &[no_return]);
llvm::LLVMRustSetVisibility(callee, llvm::Visibility::Hidden);
let llbb = llvm::LLVMAppendBasicBlockInContext(llcx, llfn, "entry\0".as_ptr().cast());
let llbuilder = llvm::LLVMCreateBuilderInContext(llcx);
llvm::LLVMPositionBuilderAtEnd(llbuilder, llbb);
let args = args
.iter()
.enumerate()
.map(|(i, _)| llvm::LLVMGetParam(llfn, i as c_uint))
.collect::<Vec<_>>();
let ret = llvm::LLVMRustBuildCall(
llbuilder,
ty,
callee,
args.as_ptr(),
args.len() as c_uint,
[].as_ptr(),
0 as c_uint,
);
llvm::LLVMSetTailCall(ret, True);
llvm::LLVMBuildRetVoid(llbuilder);
llvm::LLVMDisposeBuilder(llbuilder);
// __rust_alloc_error_handler_should_panic
let name = OomStrategy::SYMBOL;
let ll_g = llvm::LLVMRustGetOrInsertGlobal(llmod, name.as_ptr().cast(), name.len(), i8);