refactor some FnType stuff to rustc::ty::layout
This commit is contained in:
Saleem Jaffer
parent
eda0699443
commit
11426a4d50
2 changed files with 349 additions and 291 deletions
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@ -19,6 +19,12 @@ use rustc_data_structures::stable_hasher::{HashStable, StableHasher,
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StableHasherResult};
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pub use rustc_target::abi::*;
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use rustc_target::spec::HasTargetSpec;
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use rustc_target::abi::call::{
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ArgAttribute, ArgAttributes, ArgType, Conv, FnType, IgnoreMode, PassMode
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};
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pub trait IntegerExt {
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fn to_ty<'a, 'tcx>(&self, tcx: TyCtxt<'a, 'tcx, 'tcx>, signed: bool) -> Ty<'tcx>;
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@ -2259,3 +2265,346 @@ impl<'a, 'gcx> HashStable<StableHashingContext<'a>> for LayoutError<'gcx>
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}
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}
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}
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pub trait FnTypeExt<'tcx, C> {
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fn of_instance(cx: &C, instance: &ty::Instance<'tcx>) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>;
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fn new(cx: &C, sig: ty::FnSig<'tcx>, extra_args: &[Ty<'tcx>]) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>;
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fn new_vtable(cx: &C, sig: ty::FnSig<'tcx>, extra_args: &[Ty<'tcx>]) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>;
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fn new_internal(
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cx: &C,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>],
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mk_arg_type: impl Fn(Ty<'tcx>, Option<usize>) -> ArgType<'tcx, Ty<'tcx>>,
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) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>;
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}
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impl<'tcx, C> FnTypeExt<'tcx, C> for call::FnType<'tcx, Ty<'tcx>> {
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fn of_instance(cx: &C, instance: &ty::Instance<'tcx>) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>,
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{
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let sig = instance.fn_sig(cx.tcx());
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let sig = cx
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.tcx()
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.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), &sig);
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call::FnType::new(cx, sig, &[])
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}
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fn new(cx: &C, sig: ty::FnSig<'tcx>, extra_args: &[Ty<'tcx>]) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>,
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{
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call::FnType::new_internal(cx, sig, extra_args, |ty, _| ArgType::new(cx.layout_of(ty)))
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}
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fn new_vtable(cx: &C, sig: ty::FnSig<'tcx>, extra_args: &[Ty<'tcx>]) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>,
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{
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FnType::new_internal(cx, sig, extra_args, |ty, arg_idx| {
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let mut layout = cx.layout_of(ty);
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// Don't pass the vtable, it's not an argument of the virtual fn.
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// Instead, pass just the data pointer, but give it the type `*const/mut dyn Trait`
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// or `&/&mut dyn Trait` because this is special-cased elsewhere in codegen
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if arg_idx == Some(0) {
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let fat_pointer_ty = if layout.is_unsized() {
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// unsized `self` is passed as a pointer to `self`
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// FIXME (mikeyhew) change this to use &own if it is ever added to the language
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cx.tcx().mk_mut_ptr(layout.ty)
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} else {
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match layout.abi {
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Abi::ScalarPair(..) => (),
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_ => bug!("receiver type has unsupported layout: {:?}", layout),
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}
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// In the case of Rc<Self>, we need to explicitly pass a *mut RcBox<Self>
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// with a Scalar (not ScalarPair) ABI. This is a hack that is understood
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// elsewhere in the compiler as a method on a `dyn Trait`.
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// To get the type `*mut RcBox<Self>`, we just keep unwrapping newtypes until we
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// get a built-in pointer type
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let mut fat_pointer_layout = layout;
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'descend_newtypes: while !fat_pointer_layout.ty.is_unsafe_ptr()
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&& !fat_pointer_layout.ty.is_region_ptr()
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{
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'iter_fields: for i in 0..fat_pointer_layout.fields.count() {
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let field_layout = fat_pointer_layout.field(cx, i);
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if !field_layout.is_zst() {
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fat_pointer_layout = field_layout;
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continue 'descend_newtypes;
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}
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}
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bug!(
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"receiver has no non-zero-sized fields {:?}",
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fat_pointer_layout
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);
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}
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fat_pointer_layout.ty
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};
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// we now have a type like `*mut RcBox<dyn Trait>`
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// change its layout to that of `*mut ()`, a thin pointer, but keep the same type
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// this is understood as a special case elsewhere in the compiler
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let unit_pointer_ty = cx.tcx().mk_mut_ptr(cx.tcx().mk_unit());
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layout = cx.layout_of(unit_pointer_ty);
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layout.ty = fat_pointer_ty;
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}
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ArgType::new(layout)
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})
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}
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fn new_internal(
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cx: &C,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>],
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mk_arg_type: impl Fn(Ty<'tcx>, Option<usize>) -> ArgType<'tcx, Ty<'tcx>>,
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) -> Self
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where
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C: LayoutOf<Ty = Ty<'tcx>, TyLayout = TyLayout<'tcx>>
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+ HasDataLayout
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+ HasTargetSpec
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+ HasTargetSpec
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+ HasTyCtxt<'tcx>
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+ HasParamEnv<'tcx>,
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{
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debug!("FnType::new_internal({:?}, {:?})", sig, extra_args);
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use rustc_target::spec::abi::Abi::*;
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let conv = match cx.tcx().sess.target.target.adjust_abi(sig.abi) {
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RustIntrinsic | PlatformIntrinsic | Rust | RustCall => Conv::C,
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// It's the ABI's job to select this, not ours.
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System => bug!("system abi should be selected elsewhere"),
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Stdcall => Conv::X86Stdcall,
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Fastcall => Conv::X86Fastcall,
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Vectorcall => Conv::X86VectorCall,
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Thiscall => Conv::X86ThisCall,
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C => Conv::C,
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Unadjusted => Conv::C,
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Win64 => Conv::X86_64Win64,
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SysV64 => Conv::X86_64SysV,
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Aapcs => Conv::ArmAapcs,
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PtxKernel => Conv::PtxKernel,
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Msp430Interrupt => Conv::Msp430Intr,
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X86Interrupt => Conv::X86Intr,
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AmdGpuKernel => Conv::AmdGpuKernel,
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// These API constants ought to be more specific...
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Cdecl => Conv::C,
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};
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let mut inputs = sig.inputs();
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let extra_args = if sig.abi == RustCall {
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assert!(!sig.c_variadic && extra_args.is_empty());
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match sig.inputs().last().unwrap().sty {
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ty::Tuple(tupled_arguments) => {
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inputs = &sig.inputs()[0..sig.inputs().len() - 1];
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tupled_arguments.iter().map(|k| k.expect_ty()).collect()
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}
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_ => {
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bug!(
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"argument to function with \"rust-call\" ABI \
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is not a tuple"
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);
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}
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}
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} else {
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assert!(sig.c_variadic || extra_args.is_empty());
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extra_args.to_vec()
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};
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let target = &cx.tcx().sess.target.target;
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let win_x64_gnu =
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target.target_os == "windows" && target.arch == "x86_64" && target.target_env == "gnu";
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let linux_s390x =
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target.target_os == "linux" && target.arch == "s390x" && target.target_env == "gnu";
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let linux_sparc64 =
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target.target_os == "linux" && target.arch == "sparc64" && target.target_env == "gnu";
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let rust_abi = match sig.abi {
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RustIntrinsic | PlatformIntrinsic | Rust | RustCall => true,
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_ => false,
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};
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// Handle safe Rust thin and fat pointers.
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let adjust_for_rust_scalar = |attrs: &mut ArgAttributes,
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scalar: &Scalar,
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layout: TyLayout<'tcx>,
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offset: Size,
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is_return: bool| {
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// Booleans are always an i1 that needs to be zero-extended.
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if scalar.is_bool() {
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attrs.set(ArgAttribute::ZExt);
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return;
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}
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// Only pointer types handled below.
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if scalar.value != Pointer {
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return;
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}
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if scalar.valid_range.start() < scalar.valid_range.end() {
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if *scalar.valid_range.start() > 0 {
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attrs.set(ArgAttribute::NonNull);
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}
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}
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if let Some(pointee) = layout.pointee_info_at(cx, offset) {
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if let Some(kind) = pointee.safe {
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attrs.pointee_size = pointee.size;
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attrs.pointee_align = Some(pointee.align);
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// `Box` pointer parameters never alias because ownership is transferred
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// `&mut` pointer parameters never alias other parameters,
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// or mutable global data
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//
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// `&T` where `T` contains no `UnsafeCell<U>` is immutable,
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// and can be marked as both `readonly` and `noalias`, as
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// LLVM's definition of `noalias` is based solely on memory
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// dependencies rather than pointer equality
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let no_alias = match kind {
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PointerKind::Shared => false,
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PointerKind::UniqueOwned => true,
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PointerKind::Frozen | PointerKind::UniqueBorrowed => !is_return,
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};
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if no_alias {
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attrs.set(ArgAttribute::NoAlias);
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}
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if kind == PointerKind::Frozen && !is_return {
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attrs.set(ArgAttribute::ReadOnly);
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}
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}
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}
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};
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// Store the index of the last argument. This is useful for working with
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// C-compatible variadic arguments.
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let last_arg_idx = if sig.inputs().is_empty() {
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None
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} else {
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Some(sig.inputs().len() - 1)
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};
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let arg_of = |ty: Ty<'tcx>, arg_idx: Option<usize>| {
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let is_return = arg_idx.is_none();
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let mut arg = mk_arg_type(ty, arg_idx);
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if arg.layout.is_zst() {
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// For some forsaken reason, x86_64-pc-windows-gnu
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// doesn't ignore zero-sized struct arguments.
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// The same is true for s390x-unknown-linux-gnu
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// and sparc64-unknown-linux-gnu.
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if is_return || rust_abi || (!win_x64_gnu && !linux_s390x && !linux_sparc64) {
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arg.mode = PassMode::Ignore(IgnoreMode::Zst);
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}
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}
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// If this is a C-variadic function, this is not the return value,
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// and there is one or more fixed arguments; ensure that the `VaList`
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// is ignored as an argument.
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if sig.c_variadic {
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match (last_arg_idx, arg_idx) {
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(Some(last_idx), Some(cur_idx)) if last_idx == cur_idx => {
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let va_list_did = match cx.tcx().lang_items().va_list() {
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Some(did) => did,
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None => bug!("`va_list` lang item required for C-variadic functions"),
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};
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match ty.sty {
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ty::Adt(def, _) if def.did == va_list_did => {
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// This is the "spoofed" `VaList`. Set the arguments mode
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// so that it will be ignored.
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arg.mode = PassMode::Ignore(IgnoreMode::CVarArgs);
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}
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_ => (),
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}
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}
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_ => {}
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}
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}
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// FIXME(eddyb) other ABIs don't have logic for scalar pairs.
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if !is_return && rust_abi {
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if let Abi::ScalarPair(ref a, ref b) = arg.layout.abi {
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let mut a_attrs = ArgAttributes::new();
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let mut b_attrs = ArgAttributes::new();
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adjust_for_rust_scalar(&mut a_attrs, a, arg.layout, Size::ZERO, false);
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adjust_for_rust_scalar(
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&mut b_attrs,
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b,
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arg.layout,
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a.value.size(cx).align_to(b.value.align(cx).abi),
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false,
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);
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arg.mode = PassMode::Pair(a_attrs, b_attrs);
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return arg;
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}
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}
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if let Abi::Scalar(ref scalar) = arg.layout.abi {
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if let PassMode::Direct(ref mut attrs) = arg.mode {
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adjust_for_rust_scalar(attrs, scalar, arg.layout, Size::ZERO, is_return);
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}
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}
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arg
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};
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let fn_ty = FnType {
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ret: arg_of(sig.output(), None),
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args: inputs
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.iter()
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.cloned()
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.chain(extra_args)
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.enumerate()
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.map(|(i, ty)| arg_of(ty, Some(i)))
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.collect(),
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c_variadic: sig.c_variadic,
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conv,
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};
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// FIXME: uncomment this after figuring out wwhere should adjust_for_abi reside.
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//fn_ty.adjust_for_abi(cx, sig.abi);
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fn_ty
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}
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}
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|
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@ -295,19 +295,6 @@ impl ArgTypeMethods<'tcx> for Builder<'a, 'll, 'tcx> {
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}
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pub trait FnTypeExt<'tcx> {
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fn of_instance(cx: &CodegenCx<'ll, 'tcx>, instance: &ty::Instance<'tcx>) -> Self;
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fn new(cx: &CodegenCx<'ll, 'tcx>,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>]) -> Self;
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fn new_vtable(cx: &CodegenCx<'ll, 'tcx>,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>]) -> Self;
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fn new_internal(
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cx: &CodegenCx<'ll, 'tcx>,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>],
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mk_arg_type: impl Fn(Ty<'tcx>, Option<usize>) -> ArgType<'tcx, Ty<'tcx>>,
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) -> Self;
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fn adjust_for_abi(&mut self,
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cx: &CodegenCx<'ll, 'tcx>,
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abi: Abi);
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@ -319,284 +306,6 @@ pub trait FnTypeExt<'tcx> {
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}
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impl<'tcx> FnTypeExt<'tcx> for FnType<'tcx, Ty<'tcx>> {
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fn of_instance(cx: &CodegenCx<'ll, 'tcx>, instance: &ty::Instance<'tcx>) -> Self {
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let sig = instance.fn_sig(cx.tcx);
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let sig = cx.tcx.normalize_erasing_late_bound_regions(ty::ParamEnv::reveal_all(), &sig);
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FnType::new(cx, sig, &[])
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}
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fn new(cx: &CodegenCx<'ll, 'tcx>,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>]) -> Self {
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FnType::new_internal(cx, sig, extra_args, |ty, _| {
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ArgType::new(cx.layout_of(ty))
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})
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}
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fn new_vtable(cx: &CodegenCx<'ll, 'tcx>,
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sig: ty::FnSig<'tcx>,
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extra_args: &[Ty<'tcx>]) -> Self {
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FnType::new_internal(cx, sig, extra_args, |ty, arg_idx| {
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let mut layout = cx.layout_of(ty);
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// Don't pass the vtable, it's not an argument of the virtual fn.
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// Instead, pass just the data pointer, but give it the type `*const/mut dyn Trait`
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// or `&/&mut dyn Trait` because this is special-cased elsewhere in codegen
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if arg_idx == Some(0) {
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let fat_pointer_ty = if layout.is_unsized() {
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// unsized `self` is passed as a pointer to `self`
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// FIXME (mikeyhew) change this to use &own if it is ever added to the language
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cx.tcx.mk_mut_ptr(layout.ty)
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} else {
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match layout.abi {
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LayoutAbi::ScalarPair(..) => (),
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_ => bug!("receiver type has unsupported layout: {:?}", layout)
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}
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// In the case of Rc<Self>, we need to explicitly pass a *mut RcBox<Self>
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// with a Scalar (not ScalarPair) ABI. This is a hack that is understood
|
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// elsewhere in the compiler as a method on a `dyn Trait`.
|
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// To get the type `*mut RcBox<Self>`, we just keep unwrapping newtypes until we
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// get a built-in pointer type
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let mut fat_pointer_layout = layout;
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'descend_newtypes: while !fat_pointer_layout.ty.is_unsafe_ptr()
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&& !fat_pointer_layout.ty.is_region_ptr()
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{
|
||||
'iter_fields: for i in 0..fat_pointer_layout.fields.count() {
|
||||
let field_layout = fat_pointer_layout.field(cx, i);
|
||||
|
||||
if !field_layout.is_zst() {
|
||||
fat_pointer_layout = field_layout;
|
||||
continue 'descend_newtypes
|
||||
}
|
||||
}
|
||||
|
||||
bug!("receiver has no non-zero-sized fields {:?}", fat_pointer_layout);
|
||||
}
|
||||
|
||||
fat_pointer_layout.ty
|
||||
};
|
||||
|
||||
// we now have a type like `*mut RcBox<dyn Trait>`
|
||||
// change its layout to that of `*mut ()`, a thin pointer, but keep the same type
|
||||
// this is understood as a special case elsewhere in the compiler
|
||||
let unit_pointer_ty = cx.tcx.mk_mut_ptr(cx.tcx.mk_unit());
|
||||
layout = cx.layout_of(unit_pointer_ty);
|
||||
layout.ty = fat_pointer_ty;
|
||||
}
|
||||
ArgType::new(layout)
|
||||
})
|
||||
}
|
||||
|
||||
fn new_internal(
|
||||
cx: &CodegenCx<'ll, 'tcx>,
|
||||
sig: ty::FnSig<'tcx>,
|
||||
extra_args: &[Ty<'tcx>],
|
||||
mk_arg_type: impl Fn(Ty<'tcx>, Option<usize>) -> ArgType<'tcx, Ty<'tcx>>,
|
||||
) -> Self {
|
||||
debug!("FnType::new_internal({:?}, {:?})", sig, extra_args);
|
||||
|
||||
use self::Abi::*;
|
||||
let conv = match cx.sess().target.target.adjust_abi(sig.abi) {
|
||||
RustIntrinsic | PlatformIntrinsic |
|
||||
Rust | RustCall => Conv::C,
|
||||
|
||||
// It's the ABI's job to select this, not ours.
|
||||
System => bug!("system abi should be selected elsewhere"),
|
||||
|
||||
Stdcall => Conv::X86Stdcall,
|
||||
Fastcall => Conv::X86Fastcall,
|
||||
Vectorcall => Conv::X86VectorCall,
|
||||
Thiscall => Conv::X86ThisCall,
|
||||
C => Conv::C,
|
||||
Unadjusted => Conv::C,
|
||||
Win64 => Conv::X86_64Win64,
|
||||
SysV64 => Conv::X86_64SysV,
|
||||
Aapcs => Conv::ArmAapcs,
|
||||
PtxKernel => Conv::PtxKernel,
|
||||
Msp430Interrupt => Conv::Msp430Intr,
|
||||
X86Interrupt => Conv::X86Intr,
|
||||
AmdGpuKernel => Conv::AmdGpuKernel,
|
||||
|
||||
// These API constants ought to be more specific...
|
||||
Cdecl => Conv::C,
|
||||
};
|
||||
|
||||
let mut inputs = sig.inputs();
|
||||
let extra_args = if sig.abi == RustCall {
|
||||
assert!(!sig.c_variadic && extra_args.is_empty());
|
||||
|
||||
match sig.inputs().last().unwrap().sty {
|
||||
ty::Tuple(tupled_arguments) => {
|
||||
inputs = &sig.inputs()[0..sig.inputs().len() - 1];
|
||||
tupled_arguments.iter().map(|k| k.expect_ty()).collect()
|
||||
}
|
||||
_ => {
|
||||
bug!("argument to function with \"rust-call\" ABI \
|
||||
is not a tuple");
|
||||
}
|
||||
}
|
||||
} else {
|
||||
assert!(sig.c_variadic || extra_args.is_empty());
|
||||
extra_args.to_vec()
|
||||
};
|
||||
|
||||
let target = &cx.sess().target.target;
|
||||
let win_x64_gnu = target.target_os == "windows"
|
||||
&& target.arch == "x86_64"
|
||||
&& target.target_env == "gnu";
|
||||
let linux_s390x = target.target_os == "linux"
|
||||
&& target.arch == "s390x"
|
||||
&& target.target_env == "gnu";
|
||||
let linux_sparc64 = target.target_os == "linux"
|
||||
&& target.arch == "sparc64"
|
||||
&& target.target_env == "gnu";
|
||||
let rust_abi = match sig.abi {
|
||||
RustIntrinsic | PlatformIntrinsic | Rust | RustCall => true,
|
||||
_ => false
|
||||
};
|
||||
|
||||
// Handle safe Rust thin and fat pointers.
|
||||
let adjust_for_rust_scalar = |attrs: &mut ArgAttributes,
|
||||
scalar: &layout::Scalar,
|
||||
layout: TyLayout<'tcx, Ty<'tcx>>,
|
||||
offset: Size,
|
||||
is_return: bool| {
|
||||
// Booleans are always an i1 that needs to be zero-extended.
|
||||
if scalar.is_bool() {
|
||||
attrs.set(ArgAttribute::ZExt);
|
||||
return;
|
||||
}
|
||||
|
||||
// Only pointer types handled below.
|
||||
if scalar.value != layout::Pointer {
|
||||
return;
|
||||
}
|
||||
|
||||
if scalar.valid_range.start() < scalar.valid_range.end() {
|
||||
if *scalar.valid_range.start() > 0 {
|
||||
attrs.set(ArgAttribute::NonNull);
|
||||
}
|
||||
}
|
||||
|
||||
if let Some(pointee) = layout.pointee_info_at(cx, offset) {
|
||||
if let Some(kind) = pointee.safe {
|
||||
attrs.pointee_size = pointee.size;
|
||||
attrs.pointee_align = Some(pointee.align);
|
||||
|
||||
// `Box` pointer parameters never alias because ownership is transferred
|
||||
// `&mut` pointer parameters never alias other parameters,
|
||||
// or mutable global data
|
||||
//
|
||||
// `&T` where `T` contains no `UnsafeCell<U>` is immutable,
|
||||
// and can be marked as both `readonly` and `noalias`, as
|
||||
// LLVM's definition of `noalias` is based solely on memory
|
||||
// dependencies rather than pointer equality
|
||||
let no_alias = match kind {
|
||||
PointerKind::Shared => false,
|
||||
PointerKind::UniqueOwned => true,
|
||||
PointerKind::Frozen |
|
||||
PointerKind::UniqueBorrowed => !is_return
|
||||
};
|
||||
if no_alias {
|
||||
attrs.set(ArgAttribute::NoAlias);
|
||||
}
|
||||
|
||||
if kind == PointerKind::Frozen && !is_return {
|
||||
attrs.set(ArgAttribute::ReadOnly);
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
// Store the index of the last argument. This is useful for working with
|
||||
// C-compatible variadic arguments.
|
||||
let last_arg_idx = if sig.inputs().is_empty() {
|
||||
None
|
||||
} else {
|
||||
Some(sig.inputs().len() - 1)
|
||||
};
|
||||
|
||||
let arg_of = |ty: Ty<'tcx>, arg_idx: Option<usize>| {
|
||||
let is_return = arg_idx.is_none();
|
||||
let mut arg = mk_arg_type(ty, arg_idx);
|
||||
if arg.layout.is_zst() {
|
||||
// For some forsaken reason, x86_64-pc-windows-gnu
|
||||
// doesn't ignore zero-sized struct arguments.
|
||||
// The same is true for s390x-unknown-linux-gnu
|
||||
// and sparc64-unknown-linux-gnu.
|
||||
if is_return || rust_abi || (!win_x64_gnu && !linux_s390x && !linux_sparc64) {
|
||||
arg.mode = PassMode::Ignore(IgnoreMode::Zst);
|
||||
}
|
||||
}
|
||||
|
||||
// If this is a C-variadic function, this is not the return value,
|
||||
// and there is one or more fixed arguments; ensure that the `VaList`
|
||||
// is ignored as an argument.
|
||||
if sig.c_variadic {
|
||||
match (last_arg_idx, arg_idx) {
|
||||
(Some(last_idx), Some(cur_idx)) if last_idx == cur_idx => {
|
||||
let va_list_did = match cx.tcx.lang_items().va_list() {
|
||||
Some(did) => did,
|
||||
None => bug!("`va_list` lang item required for C-variadic functions"),
|
||||
};
|
||||
match ty.sty {
|
||||
ty::Adt(def, _) if def.did == va_list_did => {
|
||||
// This is the "spoofed" `VaList`. Set the arguments mode
|
||||
// so that it will be ignored.
|
||||
arg.mode = PassMode::Ignore(IgnoreMode::CVarArgs);
|
||||
},
|
||||
_ => (),
|
||||
}
|
||||
}
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
|
||||
// FIXME(eddyb) other ABIs don't have logic for scalar pairs.
|
||||
if !is_return && rust_abi {
|
||||
if let layout::Abi::ScalarPair(ref a, ref b) = arg.layout.abi {
|
||||
let mut a_attrs = ArgAttributes::new();
|
||||
let mut b_attrs = ArgAttributes::new();
|
||||
adjust_for_rust_scalar(&mut a_attrs,
|
||||
a,
|
||||
arg.layout,
|
||||
Size::ZERO,
|
||||
false);
|
||||
adjust_for_rust_scalar(&mut b_attrs,
|
||||
b,
|
||||
arg.layout,
|
||||
a.value.size(cx).align_to(b.value.align(cx).abi),
|
||||
false);
|
||||
arg.mode = PassMode::Pair(a_attrs, b_attrs);
|
||||
return arg;
|
||||
}
|
||||
}
|
||||
|
||||
if let layout::Abi::Scalar(ref scalar) = arg.layout.abi {
|
||||
if let PassMode::Direct(ref mut attrs) = arg.mode {
|
||||
adjust_for_rust_scalar(attrs,
|
||||
scalar,
|
||||
arg.layout,
|
||||
Size::ZERO,
|
||||
is_return);
|
||||
}
|
||||
}
|
||||
|
||||
arg
|
||||
};
|
||||
|
||||
let mut fn_ty = FnType {
|
||||
ret: arg_of(sig.output(), None),
|
||||
args: inputs.iter().cloned().chain(extra_args).enumerate().map(|(i, ty)| {
|
||||
arg_of(ty, Some(i))
|
||||
}).collect(),
|
||||
c_variadic: sig.c_variadic,
|
||||
conv,
|
||||
};
|
||||
fn_ty.adjust_for_abi(cx, sig.abi);
|
||||
fn_ty
|
||||
}
|
||||
|
||||
fn adjust_for_abi(&mut self,
|
||||
cx: &CodegenCx<'ll, 'tcx>,
|
||||
abi: Abi) {
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue