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