| use crate::builder::Builder; |
| use crate::context::CodegenCx; |
| use crate::llvm::{self, AttributePlace}; |
| use crate::type_::Type; |
| use crate::type_of::LayoutLlvmExt; |
| use crate::value::Value; |
| |
| use rustc_codegen_ssa::mir::operand::OperandValue; |
| use rustc_codegen_ssa::mir::place::PlaceRef; |
| use rustc_codegen_ssa::traits::*; |
| use rustc_codegen_ssa::MemFlags; |
| use rustc_middle::bug; |
| pub use rustc_middle::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA}; |
| use rustc_middle::ty::Ty; |
| use rustc_target::abi::call::ArgAbi; |
| pub use rustc_target::abi::call::*; |
| use rustc_target::abi::{self, HasDataLayout, Int, LayoutOf}; |
| pub use rustc_target::spec::abi::Abi; |
| |
| use libc::c_uint; |
| |
| macro_rules! for_each_kind { |
| ($flags: ident, $f: ident, $($kind: ident),+) => ({ |
| $(if $flags.contains(ArgAttribute::$kind) { $f(llvm::Attribute::$kind) })+ |
| }) |
| } |
| |
| trait ArgAttributeExt { |
| fn for_each_kind<F>(&self, f: F) |
| where |
| F: FnMut(llvm::Attribute); |
| } |
| |
| impl ArgAttributeExt for ArgAttribute { |
| fn for_each_kind<F>(&self, mut f: F) |
| where |
| F: FnMut(llvm::Attribute), |
| { |
| for_each_kind!(self, f, NoAlias, NoCapture, NonNull, ReadOnly, SExt, StructRet, ZExt, InReg) |
| } |
| } |
| |
| pub trait ArgAttributesExt { |
| fn apply_llfn(&self, idx: AttributePlace, llfn: &Value, ty: Option<&Type>); |
| fn apply_callsite(&self, idx: AttributePlace, callsite: &Value, ty: Option<&Type>); |
| } |
| |
| impl ArgAttributesExt for ArgAttributes { |
| fn apply_llfn(&self, idx: AttributePlace, llfn: &Value, ty: Option<&Type>) { |
| let mut regular = self.regular; |
| unsafe { |
| let deref = self.pointee_size.bytes(); |
| if deref != 0 { |
| if regular.contains(ArgAttribute::NonNull) { |
| llvm::LLVMRustAddDereferenceableAttr(llfn, idx.as_uint(), deref); |
| } else { |
| llvm::LLVMRustAddDereferenceableOrNullAttr(llfn, idx.as_uint(), deref); |
| } |
| regular -= ArgAttribute::NonNull; |
| } |
| if let Some(align) = self.pointee_align { |
| llvm::LLVMRustAddAlignmentAttr(llfn, idx.as_uint(), align.bytes() as u32); |
| } |
| if regular.contains(ArgAttribute::ByVal) { |
| llvm::LLVMRustAddByValAttr(llfn, idx.as_uint(), ty.unwrap()); |
| } |
| regular.for_each_kind(|attr| attr.apply_llfn(idx, llfn)); |
| } |
| } |
| |
| fn apply_callsite(&self, idx: AttributePlace, callsite: &Value, ty: Option<&Type>) { |
| let mut regular = self.regular; |
| unsafe { |
| let deref = self.pointee_size.bytes(); |
| if deref != 0 { |
| if regular.contains(ArgAttribute::NonNull) { |
| llvm::LLVMRustAddDereferenceableCallSiteAttr(callsite, idx.as_uint(), deref); |
| } else { |
| llvm::LLVMRustAddDereferenceableOrNullCallSiteAttr( |
| callsite, |
| idx.as_uint(), |
| deref, |
| ); |
| } |
| regular -= ArgAttribute::NonNull; |
| } |
| if let Some(align) = self.pointee_align { |
| llvm::LLVMRustAddAlignmentCallSiteAttr( |
| callsite, |
| idx.as_uint(), |
| align.bytes() as u32, |
| ); |
| } |
| if regular.contains(ArgAttribute::ByVal) { |
| llvm::LLVMRustAddByValCallSiteAttr(callsite, idx.as_uint(), ty.unwrap()); |
| } |
| regular.for_each_kind(|attr| attr.apply_callsite(idx, callsite)); |
| } |
| } |
| } |
| |
| pub trait LlvmType { |
| fn llvm_type(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type; |
| } |
| |
| impl LlvmType for Reg { |
| fn llvm_type(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type { |
| match self.kind { |
| RegKind::Integer => cx.type_ix(self.size.bits()), |
| RegKind::Float => match self.size.bits() { |
| 32 => cx.type_f32(), |
| 64 => cx.type_f64(), |
| _ => bug!("unsupported float: {:?}", self), |
| }, |
| RegKind::Vector => cx.type_vector(cx.type_i8(), self.size.bytes()), |
| } |
| } |
| } |
| |
| impl LlvmType for CastTarget { |
| fn llvm_type(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type { |
| let rest_ll_unit = self.rest.unit.llvm_type(cx); |
| let (rest_count, rem_bytes) = if self.rest.unit.size.bytes() == 0 { |
| (0, 0) |
| } else { |
| ( |
| self.rest.total.bytes() / self.rest.unit.size.bytes(), |
| self.rest.total.bytes() % self.rest.unit.size.bytes(), |
| ) |
| }; |
| |
| if self.prefix.iter().all(|x| x.is_none()) { |
| // Simplify to a single unit when there is no prefix and size <= unit size |
| if self.rest.total <= self.rest.unit.size { |
| return rest_ll_unit; |
| } |
| |
| // Simplify to array when all chunks are the same size and type |
| if rem_bytes == 0 { |
| return cx.type_array(rest_ll_unit, rest_count); |
| } |
| } |
| |
| // Create list of fields in the main structure |
| let mut args: Vec<_> = self |
| .prefix |
| .iter() |
| .flat_map(|option_kind| { |
| option_kind.map(|kind| Reg { kind, size: self.prefix_chunk }.llvm_type(cx)) |
| }) |
| .chain((0..rest_count).map(|_| rest_ll_unit)) |
| .collect(); |
| |
| // Append final integer |
| if rem_bytes != 0 { |
| // Only integers can be really split further. |
| assert_eq!(self.rest.unit.kind, RegKind::Integer); |
| args.push(cx.type_ix(rem_bytes * 8)); |
| } |
| |
| cx.type_struct(&args, false) |
| } |
| } |
| |
| pub trait ArgAbiExt<'ll, 'tcx> { |
| fn memory_ty(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type; |
| fn store( |
| &self, |
| bx: &mut Builder<'_, 'll, 'tcx>, |
| val: &'ll Value, |
| dst: PlaceRef<'tcx, &'ll Value>, |
| ); |
| fn store_fn_arg( |
| &self, |
| bx: &mut Builder<'_, 'll, 'tcx>, |
| idx: &mut usize, |
| dst: PlaceRef<'tcx, &'ll Value>, |
| ); |
| } |
| |
| impl ArgAbiExt<'ll, 'tcx> for ArgAbi<'tcx, Ty<'tcx>> { |
| /// Gets the LLVM type for a place of the original Rust type of |
| /// this argument/return, i.e., the result of `type_of::type_of`. |
| fn memory_ty(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type { |
| self.layout.llvm_type(cx) |
| } |
| |
| /// Stores a direct/indirect value described by this ArgAbi into a |
| /// place for the original Rust type of this argument/return. |
| /// Can be used for both storing formal arguments into Rust variables |
| /// or results of call/invoke instructions into their destinations. |
| fn store( |
| &self, |
| bx: &mut Builder<'_, 'll, 'tcx>, |
| val: &'ll Value, |
| dst: PlaceRef<'tcx, &'ll Value>, |
| ) { |
| if self.is_ignore() { |
| return; |
| } |
| if self.is_sized_indirect() { |
| OperandValue::Ref(val, None, self.layout.align.abi).store(bx, dst) |
| } else if self.is_unsized_indirect() { |
| bug!("unsized `ArgAbi` must be handled through `store_fn_arg`"); |
| } else if let PassMode::Cast(cast) = self.mode { |
| // FIXME(eddyb): Figure out when the simpler Store is safe, clang |
| // uses it for i16 -> {i8, i8}, but not for i24 -> {i8, i8, i8}. |
| let can_store_through_cast_ptr = false; |
| if can_store_through_cast_ptr { |
| let cast_ptr_llty = bx.type_ptr_to(cast.llvm_type(bx)); |
| let cast_dst = bx.pointercast(dst.llval, cast_ptr_llty); |
| bx.store(val, cast_dst, self.layout.align.abi); |
| } else { |
| // The actual return type is a struct, but the ABI |
| // adaptation code has cast it into some scalar type. The |
| // code that follows is the only reliable way I have |
| // found to do a transform like i64 -> {i32,i32}. |
| // Basically we dump the data onto the stack then memcpy it. |
| // |
| // Other approaches I tried: |
| // - Casting rust ret pointer to the foreign type and using Store |
| // is (a) unsafe if size of foreign type > size of rust type and |
| // (b) runs afoul of strict aliasing rules, yielding invalid |
| // assembly under -O (specifically, the store gets removed). |
| // - Truncating foreign type to correct integral type and then |
| // bitcasting to the struct type yields invalid cast errors. |
| |
| // We instead thus allocate some scratch space... |
| let scratch_size = cast.size(bx); |
| let scratch_align = cast.align(bx); |
| let llscratch = bx.alloca(cast.llvm_type(bx), scratch_align); |
| bx.lifetime_start(llscratch, scratch_size); |
| |
| // ... where we first store the value... |
| bx.store(val, llscratch, scratch_align); |
| |
| // ... and then memcpy it to the intended destination. |
| bx.memcpy( |
| dst.llval, |
| self.layout.align.abi, |
| llscratch, |
| scratch_align, |
| bx.const_usize(self.layout.size.bytes()), |
| MemFlags::empty(), |
| ); |
| |
| bx.lifetime_end(llscratch, scratch_size); |
| } |
| } else { |
| OperandValue::Immediate(val).store(bx, dst); |
| } |
| } |
| |
| fn store_fn_arg( |
| &self, |
| bx: &mut Builder<'a, 'll, 'tcx>, |
| idx: &mut usize, |
| dst: PlaceRef<'tcx, &'ll Value>, |
| ) { |
| let mut next = || { |
| let val = llvm::get_param(bx.llfn(), *idx as c_uint); |
| *idx += 1; |
| val |
| }; |
| match self.mode { |
| PassMode::Ignore => {} |
| PassMode::Pair(..) => { |
| OperandValue::Pair(next(), next()).store(bx, dst); |
| } |
| PassMode::Indirect(_, Some(_)) => { |
| OperandValue::Ref(next(), Some(next()), self.layout.align.abi).store(bx, dst); |
| } |
| PassMode::Direct(_) | PassMode::Indirect(_, None) | PassMode::Cast(_) => { |
| let next_arg = next(); |
| self.store(bx, next_arg, dst); |
| } |
| } |
| } |
| } |
| |
| impl ArgAbiMethods<'tcx> for Builder<'a, 'll, 'tcx> { |
| fn store_fn_arg( |
| &mut self, |
| arg_abi: &ArgAbi<'tcx, Ty<'tcx>>, |
| idx: &mut usize, |
| dst: PlaceRef<'tcx, Self::Value>, |
| ) { |
| arg_abi.store_fn_arg(self, idx, dst) |
| } |
| fn store_arg( |
| &mut self, |
| arg_abi: &ArgAbi<'tcx, Ty<'tcx>>, |
| val: &'ll Value, |
| dst: PlaceRef<'tcx, &'ll Value>, |
| ) { |
| arg_abi.store(self, val, dst) |
| } |
| fn arg_memory_ty(&self, arg_abi: &ArgAbi<'tcx, Ty<'tcx>>) -> &'ll Type { |
| arg_abi.memory_ty(self) |
| } |
| } |
| |
| pub trait FnAbiLlvmExt<'tcx> { |
| fn llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type; |
| fn ptr_to_llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type; |
| fn llvm_cconv(&self) -> llvm::CallConv; |
| fn apply_attrs_llfn(&self, cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value); |
| fn apply_attrs_callsite(&self, bx: &mut Builder<'a, 'll, 'tcx>, callsite: &'ll Value); |
| } |
| |
| impl<'tcx> FnAbiLlvmExt<'tcx> for FnAbi<'tcx, Ty<'tcx>> { |
| fn llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type { |
| let args_capacity: usize = self.args.iter().map(|arg| |
| if arg.pad.is_some() { 1 } else { 0 } + |
| if let PassMode::Pair(_, _) = arg.mode { 2 } else { 1 } |
| ).sum(); |
| let mut llargument_tys = Vec::with_capacity( |
| if let PassMode::Indirect(..) = self.ret.mode { 1 } else { 0 } + args_capacity, |
| ); |
| |
| let llreturn_ty = match self.ret.mode { |
| PassMode::Ignore => cx.type_void(), |
| PassMode::Direct(_) | PassMode::Pair(..) => self.ret.layout.immediate_llvm_type(cx), |
| PassMode::Cast(cast) => cast.llvm_type(cx), |
| PassMode::Indirect(..) => { |
| llargument_tys.push(cx.type_ptr_to(self.ret.memory_ty(cx))); |
| cx.type_void() |
| } |
| }; |
| |
| for arg in &self.args { |
| // add padding |
| if let Some(ty) = arg.pad { |
| llargument_tys.push(ty.llvm_type(cx)); |
| } |
| |
| let llarg_ty = match arg.mode { |
| PassMode::Ignore => continue, |
| PassMode::Direct(_) => arg.layout.immediate_llvm_type(cx), |
| PassMode::Pair(..) => { |
| llargument_tys.push(arg.layout.scalar_pair_element_llvm_type(cx, 0, true)); |
| llargument_tys.push(arg.layout.scalar_pair_element_llvm_type(cx, 1, true)); |
| continue; |
| } |
| PassMode::Indirect(_, Some(_)) => { |
| let ptr_ty = cx.tcx.mk_mut_ptr(arg.layout.ty); |
| let ptr_layout = cx.layout_of(ptr_ty); |
| llargument_tys.push(ptr_layout.scalar_pair_element_llvm_type(cx, 0, true)); |
| llargument_tys.push(ptr_layout.scalar_pair_element_llvm_type(cx, 1, true)); |
| continue; |
| } |
| PassMode::Cast(cast) => cast.llvm_type(cx), |
| PassMode::Indirect(_, None) => cx.type_ptr_to(arg.memory_ty(cx)), |
| }; |
| llargument_tys.push(llarg_ty); |
| } |
| |
| if self.c_variadic { |
| cx.type_variadic_func(&llargument_tys, llreturn_ty) |
| } else { |
| cx.type_func(&llargument_tys, llreturn_ty) |
| } |
| } |
| |
| fn ptr_to_llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type { |
| unsafe { |
| llvm::LLVMPointerType( |
| self.llvm_type(cx), |
| cx.data_layout().instruction_address_space as c_uint, |
| ) |
| } |
| } |
| |
| fn llvm_cconv(&self) -> llvm::CallConv { |
| match self.conv { |
| Conv::C | Conv::Rust => llvm::CCallConv, |
| Conv::AmdGpuKernel => llvm::AmdGpuKernel, |
| Conv::AvrInterrupt => llvm::AvrInterrupt, |
| Conv::AvrNonBlockingInterrupt => llvm::AvrNonBlockingInterrupt, |
| Conv::ArmAapcs => llvm::ArmAapcsCallConv, |
| Conv::Msp430Intr => llvm::Msp430Intr, |
| Conv::PtxKernel => llvm::PtxKernel, |
| Conv::X86Fastcall => llvm::X86FastcallCallConv, |
| Conv::X86Intr => llvm::X86_Intr, |
| Conv::X86Stdcall => llvm::X86StdcallCallConv, |
| Conv::X86ThisCall => llvm::X86_ThisCall, |
| Conv::X86VectorCall => llvm::X86_VectorCall, |
| Conv::X86_64SysV => llvm::X86_64_SysV, |
| Conv::X86_64Win64 => llvm::X86_64_Win64, |
| } |
| } |
| |
| fn apply_attrs_llfn(&self, cx: &CodegenCx<'ll, 'tcx>, llfn: &'ll Value) { |
| // FIXME(eddyb) can this also be applied to callsites? |
| if self.ret.layout.abi.is_uninhabited() { |
| llvm::Attribute::NoReturn.apply_llfn(llvm::AttributePlace::Function, llfn); |
| } |
| |
| // FIXME(eddyb, wesleywiser): apply this to callsites as well? |
| if !self.can_unwind { |
| llvm::Attribute::NoUnwind.apply_llfn(llvm::AttributePlace::Function, llfn); |
| } |
| |
| let mut i = 0; |
| let mut apply = |attrs: &ArgAttributes, ty: Option<&Type>| { |
| attrs.apply_llfn(llvm::AttributePlace::Argument(i), llfn, ty); |
| i += 1; |
| }; |
| match self.ret.mode { |
| PassMode::Direct(ref attrs) => { |
| attrs.apply_llfn(llvm::AttributePlace::ReturnValue, llfn, None); |
| } |
| PassMode::Indirect(ref attrs, _) => apply(attrs, Some(self.ret.layout.llvm_type(cx))), |
| _ => {} |
| } |
| for arg in &self.args { |
| if arg.pad.is_some() { |
| apply(&ArgAttributes::new(), None); |
| } |
| match arg.mode { |
| PassMode::Ignore => {} |
| PassMode::Direct(ref attrs) | PassMode::Indirect(ref attrs, None) => { |
| apply(attrs, Some(arg.layout.llvm_type(cx))) |
| } |
| PassMode::Indirect(ref attrs, Some(ref extra_attrs)) => { |
| apply(attrs, None); |
| apply(extra_attrs, None); |
| } |
| PassMode::Pair(ref a, ref b) => { |
| apply(a, None); |
| apply(b, None); |
| } |
| PassMode::Cast(_) => apply(&ArgAttributes::new(), None), |
| } |
| } |
| } |
| |
| fn apply_attrs_callsite(&self, bx: &mut Builder<'a, 'll, 'tcx>, callsite: &'ll Value) { |
| // FIXME(wesleywiser, eddyb): We should apply `nounwind` and `noreturn` as appropriate to this callsite. |
| |
| let mut i = 0; |
| let mut apply = |attrs: &ArgAttributes, ty: Option<&Type>| { |
| attrs.apply_callsite(llvm::AttributePlace::Argument(i), callsite, ty); |
| i += 1; |
| }; |
| match self.ret.mode { |
| PassMode::Direct(ref attrs) => { |
| attrs.apply_callsite(llvm::AttributePlace::ReturnValue, callsite, None); |
| } |
| PassMode::Indirect(ref attrs, _) => apply(attrs, Some(self.ret.layout.llvm_type(bx))), |
| _ => {} |
| } |
| if let abi::Abi::Scalar(ref scalar) = self.ret.layout.abi { |
| // If the value is a boolean, the range is 0..2 and that ultimately |
| // become 0..0 when the type becomes i1, which would be rejected |
| // by the LLVM verifier. |
| if let Int(..) = scalar.value { |
| if !scalar.is_bool() { |
| let range = scalar.valid_range_exclusive(bx); |
| if range.start != range.end { |
| bx.range_metadata(callsite, range); |
| } |
| } |
| } |
| } |
| for arg in &self.args { |
| if arg.pad.is_some() { |
| apply(&ArgAttributes::new(), None); |
| } |
| match arg.mode { |
| PassMode::Ignore => {} |
| PassMode::Direct(ref attrs) | PassMode::Indirect(ref attrs, None) => { |
| apply(attrs, Some(arg.layout.llvm_type(bx))) |
| } |
| PassMode::Indirect(ref attrs, Some(ref extra_attrs)) => { |
| apply(attrs, None); |
| apply(extra_attrs, None); |
| } |
| PassMode::Pair(ref a, ref b) => { |
| apply(a, None); |
| apply(b, None); |
| } |
| PassMode::Cast(_) => apply(&ArgAttributes::new(), None), |
| } |
| } |
| |
| let cconv = self.llvm_cconv(); |
| if cconv != llvm::CCallConv { |
| llvm::SetInstructionCallConv(callsite, cconv); |
| } |
| } |
| } |
| |
| impl AbiBuilderMethods<'tcx> for Builder<'a, 'll, 'tcx> { |
| fn apply_attrs_callsite(&mut self, fn_abi: &FnAbi<'tcx, Ty<'tcx>>, callsite: Self::Value) { |
| fn_abi.apply_attrs_callsite(self, callsite) |
| } |
| |
| fn get_param(&self, index: usize) -> Self::Value { |
| llvm::get_param(self.llfn(), index as c_uint) |
| } |
| } |
