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clarify PassMode::Indirect as well

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This commit is contained in:
Ralf Jung 2023-09-08 08:48:41 +02:00
parent 7740476a43
commit 89139d4c46
9 changed files with 62 additions and 56 deletions
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35
compiler/rustc_codegen_llvm/src/abi.rs
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@ -274,11 +274,11 @@ impl<'ll, 'tcx> ArgAbiExt<'ll, 'tcx> for ArgAbi<'tcx, Ty<'tcx>> {
PassMode::Pair(..) => {
OperandValue::Pair(next(), next()).store(bx, dst);
}
PassMode::Indirect { attrs: _, extra_attrs: Some(_), on_stack: _ } => {
PassMode::Indirect { attrs: _, meta_attrs: Some(_), on_stack: _ } => {
OperandValue::Ref(next(), Some(next()), self.layout.align.abi).store(bx, dst);
}
PassMode::Direct(_)
| PassMode::Indirect { attrs: _, extra_attrs: None, on_stack: _ }
| PassMode::Indirect { attrs: _, meta_attrs: None, on_stack: _ }
| PassMode::Cast { .. } => {
let next_arg = next();
self.store(bx, next_arg, dst);
@ -378,8 +378,10 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
llargument_tys.push(arg.layout.scalar_pair_element_llvm_type(cx, 1, true));
continue;
}
PassMode::Indirect { attrs: _, extra_attrs: Some(_), on_stack: _ } => {
assert!(arg.layout.is_unsized());
PassMode::Indirect { attrs: _, meta_attrs: Some(_), on_stack } => {
// `Indirect` with metadata is only for unsized types, and doesn't work with
// on-stack passing.
assert!(arg.layout.is_unsized() && !on_stack);
// Construct the type of a (wide) pointer to `ty`, and pass its two fields.
// Any two ABI-compatible unsized types have the same metadata type and
// moreover the same metadata value leads to the same dynamic size and
@ -390,6 +392,10 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
llargument_tys.push(ptr_layout.scalar_pair_element_llvm_type(cx, 1, true));
continue;
}
PassMode::Indirect { attrs: _, meta_attrs: None, on_stack: _ } => {
assert!(arg.layout.is_sized());
cx.type_ptr()
}
PassMode::Cast { cast, pad_i32 } => {
// `Cast` means "transmute to `CastType`"; that only makes sense for sized types.
assert!(arg.layout.is_sized());
@ -401,7 +407,6 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
// We assume here that ABI-compatible Rust types have the same cast type.
cast.llvm_type(cx)
}
PassMode::Indirect { attrs: _, extra_attrs: None, on_stack: _ } => cx.type_ptr(),
};
llargument_tys.push(llarg_ty);
}
@ -444,7 +449,7 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
PassMode::Direct(attrs) => {
attrs.apply_attrs_to_llfn(llvm::AttributePlace::ReturnValue, cx, llfn);
}
PassMode::Indirect { attrs, extra_attrs: _, on_stack } => {
PassMode::Indirect { attrs, meta_attrs: _, on_stack } => {
assert!(!on_stack);
let i = apply(attrs);
let sret = llvm::CreateStructRetAttr(cx.llcx, self.ret.layout.llvm_type(cx));
@ -458,19 +463,19 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
for arg in self.args.iter() {
match &arg.mode {
PassMode::Ignore => {}
PassMode::Indirect { attrs, extra_attrs: None, on_stack: true } => {
PassMode::Indirect { attrs, meta_attrs: None, on_stack: true } => {
let i = apply(attrs);
let byval = llvm::CreateByValAttr(cx.llcx, arg.layout.llvm_type(cx));
attributes::apply_to_llfn(llfn, llvm::AttributePlace::Argument(i), &[byval]);
}
PassMode::Direct(attrs)
| PassMode::Indirect { attrs, extra_attrs: None, on_stack: false } => {
| PassMode::Indirect { attrs, meta_attrs: None, on_stack: false } => {
apply(attrs);
}
PassMode::Indirect { attrs, extra_attrs: Some(extra_attrs), on_stack } => {
PassMode::Indirect { attrs, meta_attrs: Some(meta_attrs), on_stack } => {
assert!(!on_stack);
apply(attrs);
apply(extra_attrs);
apply(meta_attrs);
}
PassMode::Pair(a, b) => {
apply(a);
@ -506,7 +511,7 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
PassMode::Direct(attrs) => {
attrs.apply_attrs_to_callsite(llvm::AttributePlace::ReturnValue, bx.cx, callsite);
}
PassMode::Indirect { attrs, extra_attrs: _, on_stack } => {
PassMode::Indirect { attrs, meta_attrs: _, on_stack } => {
assert!(!on_stack);
let i = apply(bx.cx, attrs);
let sret = llvm::CreateStructRetAttr(bx.cx.llcx, self.ret.layout.llvm_type(bx));
@ -534,7 +539,7 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
for arg in self.args.iter() {
match &arg.mode {
PassMode::Ignore => {}
PassMode::Indirect { attrs, extra_attrs: None, on_stack: true } => {
PassMode::Indirect { attrs, meta_attrs: None, on_stack: true } => {
let i = apply(bx.cx, attrs);
let byval = llvm::CreateByValAttr(bx.cx.llcx, arg.layout.llvm_type(bx));
attributes::apply_to_callsite(
@ -544,12 +549,12 @@ impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
);
}
PassMode::Direct(attrs)
| PassMode::Indirect { attrs, extra_attrs: None, on_stack: false } => {
| PassMode::Indirect { attrs, meta_attrs: None, on_stack: false } => {
apply(bx.cx, attrs);
}
PassMode::Indirect { attrs, extra_attrs: Some(extra_attrs), on_stack: _ } => {
PassMode::Indirect { attrs, meta_attrs: Some(meta_attrs), on_stack: _ } => {
apply(bx.cx, attrs);
apply(bx.cx, extra_attrs);
apply(bx.cx, meta_attrs);
}
PassMode::Pair(a, b) => {
apply(bx.cx, a);