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-rw-r--r--compiler/rustc_codegen_llvm/src/abi.rs599
1 files changed, 599 insertions, 0 deletions
diff --git a/compiler/rustc_codegen_llvm/src/abi.rs b/compiler/rustc_codegen_llvm/src/abi.rs
new file mode 100644
index 000000000..9eb3574e7
--- /dev/null
+++ b/compiler/rustc_codegen_llvm/src/abi.rs
@@ -0,0 +1,599 @@
+use crate::attributes;
+use crate::builder::Builder;
+use crate::context::CodegenCx;
+use crate::llvm::{self, Attribute, 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;
+use rustc_middle::ty::layout::LayoutOf;
+pub use rustc_middle::ty::layout::{FAT_PTR_ADDR, FAT_PTR_EXTRA};
+use rustc_middle::ty::Ty;
+use rustc_session::config;
+use rustc_target::abi::call::ArgAbi;
+pub use rustc_target::abi::call::*;
+use rustc_target::abi::{self, HasDataLayout, Int};
+pub use rustc_target::spec::abi::Abi;
+
+use libc::c_uint;
+use smallvec::SmallVec;
+
+pub trait ArgAttributesExt {
+ fn apply_attrs_to_llfn(&self, idx: AttributePlace, cx: &CodegenCx<'_, '_>, llfn: &Value);
+ fn apply_attrs_to_callsite(
+ &self,
+ idx: AttributePlace,
+ cx: &CodegenCx<'_, '_>,
+ callsite: &Value,
+ );
+}
+
+fn should_use_mutable_noalias(cx: &CodegenCx<'_, '_>) -> bool {
+ // LLVM prior to version 12 had known miscompiles in the presence of
+ // noalias attributes (see #54878), but we don't support earlier
+ // versions at all anymore. We now enable mutable noalias by default.
+ cx.tcx.sess.opts.unstable_opts.mutable_noalias.unwrap_or(true)
+}
+
+const ABI_AFFECTING_ATTRIBUTES: [(ArgAttribute, llvm::AttributeKind); 1] =
+ [(ArgAttribute::InReg, llvm::AttributeKind::InReg)];
+
+const OPTIMIZATION_ATTRIBUTES: [(ArgAttribute, llvm::AttributeKind); 5] = [
+ (ArgAttribute::NoAlias, llvm::AttributeKind::NoAlias),
+ (ArgAttribute::NoCapture, llvm::AttributeKind::NoCapture),
+ (ArgAttribute::NonNull, llvm::AttributeKind::NonNull),
+ (ArgAttribute::ReadOnly, llvm::AttributeKind::ReadOnly),
+ (ArgAttribute::NoUndef, llvm::AttributeKind::NoUndef),
+];
+
+fn get_attrs<'ll>(this: &ArgAttributes, cx: &CodegenCx<'ll, '_>) -> SmallVec<[&'ll Attribute; 8]> {
+ let mut regular = this.regular;
+
+ let mut attrs = SmallVec::new();
+
+ // ABI-affecting attributes must always be applied
+ for (attr, llattr) in ABI_AFFECTING_ATTRIBUTES {
+ if regular.contains(attr) {
+ attrs.push(llattr.create_attr(cx.llcx));
+ }
+ }
+ if let Some(align) = this.pointee_align {
+ attrs.push(llvm::CreateAlignmentAttr(cx.llcx, align.bytes()));
+ }
+ match this.arg_ext {
+ ArgExtension::None => {}
+ ArgExtension::Zext => attrs.push(llvm::AttributeKind::ZExt.create_attr(cx.llcx)),
+ ArgExtension::Sext => attrs.push(llvm::AttributeKind::SExt.create_attr(cx.llcx)),
+ }
+
+ // Only apply remaining attributes when optimizing
+ if cx.sess().opts.optimize != config::OptLevel::No {
+ let deref = this.pointee_size.bytes();
+ if deref != 0 {
+ if regular.contains(ArgAttribute::NonNull) {
+ attrs.push(llvm::CreateDereferenceableAttr(cx.llcx, deref));
+ } else {
+ attrs.push(llvm::CreateDereferenceableOrNullAttr(cx.llcx, deref));
+ }
+ regular -= ArgAttribute::NonNull;
+ }
+ for (attr, llattr) in OPTIMIZATION_ATTRIBUTES {
+ if regular.contains(attr) {
+ attrs.push(llattr.create_attr(cx.llcx));
+ }
+ }
+ if regular.contains(ArgAttribute::NoAliasMutRef) && should_use_mutable_noalias(cx) {
+ attrs.push(llvm::AttributeKind::NoAlias.create_attr(cx.llcx));
+ }
+ }
+
+ attrs
+}
+
+impl ArgAttributesExt for ArgAttributes {
+ fn apply_attrs_to_llfn(&self, idx: AttributePlace, cx: &CodegenCx<'_, '_>, llfn: &Value) {
+ let attrs = get_attrs(self, cx);
+ attributes::apply_to_llfn(llfn, idx, &attrs);
+ }
+
+ fn apply_attrs_to_callsite(
+ &self,
+ idx: AttributePlace,
+ cx: &CodegenCx<'_, '_>,
+ callsite: &Value,
+ ) {
+ let attrs = get_attrs(self, cx);
+ attributes::apply_to_callsite(callsite, idx, &attrs);
+ }
+}
+
+pub trait LlvmType {
+ fn llvm_type<'ll>(&self, cx: &CodegenCx<'ll, '_>) -> &'ll Type;
+}
+
+impl LlvmType for Reg {
+ fn llvm_type<'ll>(&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<'ll>(&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_reg| option_reg.map(|reg| reg.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<'ll, 'tcx> 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<'_, '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 { attrs: _, extra_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::Cast(_) => {
+ let next_arg = next();
+ self.store(bx, next_arg, dst);
+ }
+ }
+ }
+}
+
+impl<'ll, 'tcx> ArgAbiMethods<'tcx> for Builder<'_, '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<'ll, '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<'_, 'll, 'tcx>, callsite: &'ll Value);
+}
+
+impl<'ll, 'tcx> FnAbiLlvmExt<'ll, 'tcx> for FnAbi<'tcx, Ty<'tcx>> {
+ fn llvm_type(&self, cx: &CodegenCx<'ll, 'tcx>) -> &'ll Type {
+ // Ignore "extra" args from the call site for C variadic functions.
+ // Only the "fixed" args are part of the LLVM function signature.
+ let args = if self.c_variadic { &self.args[..self.fixed_count] } else { &self.args };
+
+ let args_capacity: usize = 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 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 { attrs: _, extra_attrs: Some(_), on_stack: _ } => {
+ 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 { attrs: _, extra_attrs: None, on_stack: _ } => {
+ 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.0 as c_uint,
+ )
+ }
+ }
+
+ fn llvm_cconv(&self) -> llvm::CallConv {
+ match self.conv {
+ Conv::C | Conv::Rust | Conv::CCmseNonSecureCall => llvm::CCallConv,
+ Conv::RustCold => llvm::ColdCallConv,
+ 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) {
+ let mut func_attrs = SmallVec::<[_; 2]>::new();
+ if self.ret.layout.abi.is_uninhabited() {
+ func_attrs.push(llvm::AttributeKind::NoReturn.create_attr(cx.llcx));
+ }
+ if !self.can_unwind {
+ func_attrs.push(llvm::AttributeKind::NoUnwind.create_attr(cx.llcx));
+ }
+ attributes::apply_to_llfn(llfn, llvm::AttributePlace::Function, &{ func_attrs });
+
+ let mut i = 0;
+ let mut apply = |attrs: &ArgAttributes| {
+ attrs.apply_attrs_to_llfn(llvm::AttributePlace::Argument(i), cx, llfn);
+ i += 1;
+ i - 1
+ };
+ match self.ret.mode {
+ PassMode::Direct(ref attrs) => {
+ attrs.apply_attrs_to_llfn(llvm::AttributePlace::ReturnValue, cx, llfn);
+ }
+ PassMode::Indirect { ref attrs, extra_attrs: _, on_stack } => {
+ assert!(!on_stack);
+ let i = apply(attrs);
+ let sret = llvm::CreateStructRetAttr(cx.llcx, self.ret.layout.llvm_type(cx));
+ attributes::apply_to_llfn(llfn, llvm::AttributePlace::Argument(i), &[sret]);
+ }
+ PassMode::Cast(cast) => {
+ cast.attrs.apply_attrs_to_llfn(llvm::AttributePlace::ReturnValue, cx, llfn);
+ }
+ _ => {}
+ }
+ for arg in &self.args {
+ if arg.pad.is_some() {
+ apply(&ArgAttributes::new());
+ }
+ match arg.mode {
+ PassMode::Ignore => {}
+ PassMode::Indirect { ref attrs, extra_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(ref attrs)
+ | PassMode::Indirect { ref attrs, extra_attrs: None, on_stack: false } => {
+ apply(attrs);
+ }
+ PassMode::Indirect { ref attrs, extra_attrs: Some(ref extra_attrs), on_stack } => {
+ assert!(!on_stack);
+ apply(attrs);
+ apply(extra_attrs);
+ }
+ PassMode::Pair(ref a, ref b) => {
+ apply(a);
+ apply(b);
+ }
+ PassMode::Cast(cast) => {
+ apply(&cast.attrs);
+ }
+ }
+ }
+ }
+
+ fn apply_attrs_callsite(&self, bx: &mut Builder<'_, 'll, 'tcx>, callsite: &'ll Value) {
+ let mut func_attrs = SmallVec::<[_; 2]>::new();
+ if self.ret.layout.abi.is_uninhabited() {
+ func_attrs.push(llvm::AttributeKind::NoReturn.create_attr(bx.cx.llcx));
+ }
+ if !self.can_unwind {
+ func_attrs.push(llvm::AttributeKind::NoUnwind.create_attr(bx.cx.llcx));
+ }
+ attributes::apply_to_callsite(callsite, llvm::AttributePlace::Function, &{ func_attrs });
+
+ let mut i = 0;
+ let mut apply = |cx: &CodegenCx<'_, '_>, attrs: &ArgAttributes| {
+ attrs.apply_attrs_to_callsite(llvm::AttributePlace::Argument(i), cx, callsite);
+ i += 1;
+ i - 1
+ };
+ match self.ret.mode {
+ PassMode::Direct(ref attrs) => {
+ attrs.apply_attrs_to_callsite(llvm::AttributePlace::ReturnValue, bx.cx, callsite);
+ }
+ PassMode::Indirect { ref attrs, extra_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));
+ attributes::apply_to_callsite(callsite, llvm::AttributePlace::Argument(i), &[sret]);
+ }
+ PassMode::Cast(cast) => {
+ cast.attrs.apply_attrs_to_callsite(
+ llvm::AttributePlace::ReturnValue,
+ &bx.cx,
+ callsite,
+ );
+ }
+ _ => {}
+ }
+ if let abi::Abi::Scalar(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.primitive() {
+ if !scalar.is_bool() && !scalar.is_always_valid(bx) {
+ bx.range_metadata(callsite, scalar.valid_range(bx));
+ }
+ }
+ }
+ for arg in &self.args {
+ if arg.pad.is_some() {
+ apply(bx.cx, &ArgAttributes::new());
+ }
+ match arg.mode {
+ PassMode::Ignore => {}
+ PassMode::Indirect { ref attrs, extra_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(
+ callsite,
+ llvm::AttributePlace::Argument(i),
+ &[byval],
+ );
+ }
+ PassMode::Direct(ref attrs)
+ | PassMode::Indirect { ref attrs, extra_attrs: None, on_stack: false } => {
+ apply(bx.cx, attrs);
+ }
+ PassMode::Indirect {
+ ref attrs,
+ extra_attrs: Some(ref extra_attrs),
+ on_stack: _,
+ } => {
+ apply(bx.cx, attrs);
+ apply(bx.cx, extra_attrs);
+ }
+ PassMode::Pair(ref a, ref b) => {
+ apply(bx.cx, a);
+ apply(bx.cx, b);
+ }
+ PassMode::Cast(cast) => {
+ apply(bx.cx, &cast.attrs);
+ }
+ }
+ }
+
+ let cconv = self.llvm_cconv();
+ if cconv != llvm::CCallConv {
+ llvm::SetInstructionCallConv(callsite, cconv);
+ }
+
+ if self.conv == Conv::CCmseNonSecureCall {
+ // This will probably get ignored on all targets but those supporting the TrustZone-M
+ // extension (thumbv8m targets).
+ let cmse_nonsecure_call = llvm::CreateAttrString(bx.cx.llcx, "cmse_nonsecure_call");
+ attributes::apply_to_callsite(
+ callsite,
+ llvm::AttributePlace::Function,
+ &[cmse_nonsecure_call],
+ );
+ }
+
+ // Some intrinsics require that an elementtype attribute (with the pointee type of a
+ // pointer argument) is added to the callsite.
+ let element_type_index = unsafe { llvm::LLVMRustGetElementTypeArgIndex(callsite) };
+ if element_type_index >= 0 {
+ let arg_ty = self.args[element_type_index as usize].layout.ty;
+ let pointee_ty = arg_ty.builtin_deref(true).expect("Must be pointer argument").ty;
+ let element_type_attr = unsafe {
+ llvm::LLVMRustCreateElementTypeAttr(bx.llcx, bx.layout_of(pointee_ty).llvm_type(bx))
+ };
+ attributes::apply_to_callsite(
+ callsite,
+ llvm::AttributePlace::Argument(element_type_index as u32),
+ &[element_type_attr],
+ );
+ }
+ }
+}
+
+impl<'tcx> AbiBuilderMethods<'tcx> for Builder<'_, '_, '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(&mut self, index: usize) -> Self::Value {
+ llvm::get_param(self.llfn(), index as c_uint)
+ }
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-06-11 23:31:52 +0000