diff options
Diffstat (limited to 'compiler/rustc_codegen_llvm/src/builder.rs')
| -rw-r--r-- | compiler/rustc_codegen_llvm/src/builder.rs | 279 |
1 files changed, 176 insertions, 103 deletions
diff --git a/compiler/rustc_codegen_llvm/src/builder.rs b/compiler/rustc_codegen_llvm/src/builder.rs index 514923ad6f3..0f17cc9063a 100644 --- a/compiler/rustc_codegen_llvm/src/builder.rs +++ b/compiler/rustc_codegen_llvm/src/builder.rs @@ -3,6 +3,7 @@ use std::ops::Deref; use std::{iter, ptr}; pub(crate) mod autodiff; +pub(crate) mod gpu_offload; use libc::{c_char, c_uint, size_t}; use rustc_abi as abi; @@ -14,6 +15,7 @@ use rustc_codegen_ssa::mir::place::PlaceRef; use rustc_codegen_ssa::traits::*; use rustc_data_structures::small_c_str::SmallCStr; use rustc_hir::def_id::DefId; +use rustc_middle::bug; use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrs; use rustc_middle::ty::layout::{ FnAbiError, FnAbiOfHelpers, FnAbiRequest, HasTypingEnv, LayoutError, LayoutOfHelpers, @@ -23,7 +25,7 @@ use rustc_middle::ty::{self, Instance, Ty, TyCtxt}; use rustc_sanitizers::{cfi, kcfi}; use rustc_session::config::OptLevel; use rustc_span::Span; -use rustc_target::callconv::FnAbi; +use rustc_target::callconv::{FnAbi, PassMode}; use rustc_target::spec::{HasTargetSpec, SanitizerSet, Target}; use smallvec::SmallVec; use tracing::{debug, instrument}; @@ -33,7 +35,7 @@ use crate::attributes; use crate::common::Funclet; use crate::context::{CodegenCx, FullCx, GenericCx, SCx}; use crate::llvm::{ - self, AtomicOrdering, AtomicRmwBinOp, BasicBlock, False, GEPNoWrapFlags, Metadata, True, + self, AtomicOrdering, AtomicRmwBinOp, BasicBlock, GEPNoWrapFlags, Metadata, TRUE, ToLlvmBool, }; use crate::type_::Type; use crate::type_of::LayoutLlvmExt; @@ -117,6 +119,74 @@ impl<'a, 'll, CX: Borrow<SCx<'ll>>> GenericBuilder<'a, 'll, CX> { } bx } + + // The generic builder has less functionality and thus (unlike the other alloca) we can not + // easily jump to the beginning of the function to place our allocas there. We trust the user + // to manually do that. FIXME(offload): improve the genericCx and add more llvm wrappers to + // handle this. + pub(crate) fn direct_alloca(&mut self, ty: &'ll Type, align: Align, name: &str) -> &'ll Value { + let val = unsafe { + let alloca = llvm::LLVMBuildAlloca(self.llbuilder, ty, UNNAMED); + llvm::LLVMSetAlignment(alloca, align.bytes() as c_uint); + // Cast to default addrspace if necessary + llvm::LLVMBuildPointerCast(self.llbuilder, alloca, self.cx.type_ptr(), UNNAMED) + }; + if name != "" { + let name = std::ffi::CString::new(name).unwrap(); + llvm::set_value_name(val, &name.as_bytes()); + } + val + } + + pub(crate) fn inbounds_gep( + &mut self, + ty: &'ll Type, + ptr: &'ll Value, + indices: &[&'ll Value], + ) -> &'ll Value { + unsafe { + llvm::LLVMBuildGEPWithNoWrapFlags( + self.llbuilder, + ty, + ptr, + indices.as_ptr(), + indices.len() as c_uint, + UNNAMED, + GEPNoWrapFlags::InBounds, + ) + } + } + + pub(crate) fn store(&mut self, val: &'ll Value, ptr: &'ll Value, align: Align) -> &'ll Value { + debug!("Store {:?} -> {:?}", val, ptr); + assert_eq!(self.cx.type_kind(self.cx.val_ty(ptr)), TypeKind::Pointer); + unsafe { + let store = llvm::LLVMBuildStore(self.llbuilder, val, ptr); + llvm::LLVMSetAlignment(store, align.bytes() as c_uint); + store + } + } + + pub(crate) fn load(&mut self, ty: &'ll Type, ptr: &'ll Value, align: Align) -> &'ll Value { + unsafe { + let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED); + llvm::LLVMSetAlignment(load, align.bytes() as c_uint); + load + } + } + + fn memset(&mut self, ptr: &'ll Value, fill_byte: &'ll Value, size: &'ll Value, align: Align) { + unsafe { + llvm::LLVMRustBuildMemSet( + self.llbuilder, + ptr, + align.bytes() as c_uint, + fill_byte, + size, + false, + ); + } + } } /// Empty string, to be used where LLVM expects an instruction name, indicating @@ -423,8 +493,8 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { unsafe { let add = llvm::LLVMBuildAdd(self.llbuilder, a, b, UNNAMED); if llvm::LLVMIsAInstruction(add).is_some() { - llvm::LLVMSetNUW(add, True); - llvm::LLVMSetNSW(add, True); + llvm::LLVMSetNUW(add, TRUE); + llvm::LLVMSetNSW(add, TRUE); } add } @@ -433,8 +503,8 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { unsafe { let sub = llvm::LLVMBuildSub(self.llbuilder, a, b, UNNAMED); if llvm::LLVMIsAInstruction(sub).is_some() { - llvm::LLVMSetNUW(sub, True); - llvm::LLVMSetNSW(sub, True); + llvm::LLVMSetNUW(sub, TRUE); + llvm::LLVMSetNSW(sub, TRUE); } sub } @@ -443,8 +513,8 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { unsafe { let mul = llvm::LLVMBuildMul(self.llbuilder, a, b, UNNAMED); if llvm::LLVMIsAInstruction(mul).is_some() { - llvm::LLVMSetNUW(mul, True); - llvm::LLVMSetNSW(mul, True); + llvm::LLVMSetNUW(mul, TRUE); + llvm::LLVMSetNSW(mul, TRUE); } mul } @@ -458,7 +528,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { // an instruction, so we need to check before setting the flag. // (See also `LLVMBuildNUWNeg` which also needs a check.) if llvm::LLVMIsAInstruction(or).is_some() { - llvm::LLVMSetIsDisjoint(or, True); + llvm::LLVMSetIsDisjoint(or, TRUE); } or } @@ -487,13 +557,25 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { let (size, signed) = ty.int_size_and_signed(self.tcx); let width = size.bits(); - if oop == OverflowOp::Sub && !signed { - // Emit sub and icmp instead of llvm.usub.with.overflow. LLVM considers these - // to be the canonical form. It will attempt to reform llvm.usub.with.overflow - // in the backend if profitable. - let sub = self.sub(lhs, rhs); - let cmp = self.icmp(IntPredicate::IntULT, lhs, rhs); - return (sub, cmp); + if !signed { + match oop { + OverflowOp::Sub => { + // Emit sub and icmp instead of llvm.usub.with.overflow. LLVM considers these + // to be the canonical form. It will attempt to reform llvm.usub.with.overflow + // in the backend if profitable. + let sub = self.sub(lhs, rhs); + let cmp = self.icmp(IntPredicate::IntULT, lhs, rhs); + return (sub, cmp); + } + OverflowOp::Add => { + // Like with sub above, using icmp is the preferred form. See + // <https://rust-lang.zulipchat.com/#narrow/channel/187780-t-compiler.2Fllvm/topic/.60uadd.2Ewith.2Eoverflow.60.20.28again.29/near/533041085> + let add = self.add(lhs, rhs); + let cmp = self.icmp(IntPredicate::IntULT, add, lhs); + return (add, cmp); + } + OverflowOp::Mul => {} + } } let oop_str = match oop { @@ -547,7 +629,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { fn volatile_load(&mut self, ty: &'ll Type, ptr: &'ll Value) -> &'ll Value { unsafe { let load = llvm::LLVMBuildLoad2(self.llbuilder, ty, ptr, UNNAMED); - llvm::LLVMSetVolatile(load, llvm::True); + llvm::LLVMSetVolatile(load, llvm::TRUE); load } } @@ -618,10 +700,10 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { bx.nonnull_metadata(load); } - if let Some(pointee) = layout.pointee_info_at(bx, offset) { - if let Some(_) = pointee.safe { - bx.align_metadata(load, pointee.align); - } + if let Some(pointee) = layout.pointee_info_at(bx, offset) + && let Some(_) = pointee.safe + { + bx.align_metadata(load, pointee.align); } } abi::Primitive::Float(_) => {} @@ -635,7 +717,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { let mut const_llval = None; let llty = place.layout.llvm_type(self); if let Some(global) = llvm::LLVMIsAGlobalVariable(place.val.llval) { - if llvm::LLVMIsGlobalConstant(global) == llvm::True { + if llvm::LLVMIsGlobalConstant(global).is_true() { if let Some(init) = llvm::LLVMGetInitializer(global) { if self.val_ty(init) == llty { const_llval = Some(init); @@ -756,7 +838,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { if flags.contains(MemFlags::UNALIGNED) { 1 } else { align.bytes() as c_uint }; llvm::LLVMSetAlignment(store, align); if flags.contains(MemFlags::VOLATILE) { - llvm::LLVMSetVolatile(store, llvm::True); + llvm::LLVMSetVolatile(store, llvm::TRUE); } if flags.contains(MemFlags::NONTEMPORAL) { // Make sure that the current target architectures supports "sane" non-temporal @@ -874,7 +956,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { let trunc = self.trunc(val, dest_ty); unsafe { if llvm::LLVMIsAInstruction(trunc).is_some() { - llvm::LLVMSetNUW(trunc, True); + llvm::LLVMSetNUW(trunc, TRUE); } } trunc @@ -886,7 +968,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { let trunc = self.trunc(val, dest_ty); unsafe { if llvm::LLVMIsAInstruction(trunc).is_some() { - llvm::LLVMSetNSW(trunc, True); + llvm::LLVMSetNSW(trunc, TRUE); } } trunc @@ -985,13 +1067,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { fn intcast(&mut self, val: &'ll Value, dest_ty: &'ll Type, is_signed: bool) -> &'ll Value { unsafe { - llvm::LLVMBuildIntCast2( - self.llbuilder, - val, - dest_ty, - if is_signed { True } else { False }, - UNNAMED, - ) + llvm::LLVMBuildIntCast2(self.llbuilder, val, dest_ty, is_signed.to_llvm_bool(), UNNAMED) } } @@ -1015,16 +1091,11 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { ty: Ty<'tcx>, lhs: Self::Value, rhs: Self::Value, - ) -> Option<Self::Value> { - // FIXME: See comment on the definition of `three_way_compare`. - if crate::llvm_util::get_version() < (20, 0, 0) { - return None; - } - + ) -> Self::Value { let size = ty.primitive_size(self.tcx); let name = if ty.is_signed() { "llvm.scmp" } else { "llvm.ucmp" }; - Some(self.call_intrinsic(name, &[self.type_i8(), self.type_ix(size.bits())], &[lhs, rhs])) + self.call_intrinsic(name, &[self.type_i8(), self.type_ix(size.bits())], &[lhs, rhs]) } /* Miscellaneous instructions */ @@ -1147,7 +1218,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { let ty = self.type_struct(&[self.type_ptr(), self.type_i32()], false); let landing_pad = self.landing_pad(ty, pers_fn, 0); unsafe { - llvm::LLVMSetCleanup(landing_pad, llvm::True); + llvm::LLVMSetCleanup(landing_pad, llvm::TRUE); } (self.extract_value(landing_pad, 0), self.extract_value(landing_pad, 1)) } @@ -1235,7 +1306,6 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { failure_order: rustc_middle::ty::AtomicOrdering, weak: bool, ) -> (&'ll Value, &'ll Value) { - let weak = if weak { llvm::True } else { llvm::False }; unsafe { let value = llvm::LLVMBuildAtomicCmpXchg( self.llbuilder, @@ -1244,9 +1314,9 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { src, AtomicOrdering::from_generic(order), AtomicOrdering::from_generic(failure_order), - llvm::False, // SingleThreaded + llvm::FALSE, // SingleThreaded ); - llvm::LLVMSetWeak(value, weak); + llvm::LLVMSetWeak(value, weak.to_llvm_bool()); let val = self.extract_value(value, 0); let success = self.extract_value(value, 1); (val, success) @@ -1257,15 +1327,13 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { &mut self, op: rustc_codegen_ssa::common::AtomicRmwBinOp, dst: &'ll Value, - mut src: &'ll Value, + src: &'ll Value, order: rustc_middle::ty::AtomicOrdering, + ret_ptr: bool, ) -> &'ll Value { - // The only RMW operation that LLVM supports on pointers is compare-exchange. - let requires_cast_to_int = self.val_ty(src) == self.type_ptr() - && op != rustc_codegen_ssa::common::AtomicRmwBinOp::AtomicXchg; - if requires_cast_to_int { - src = self.ptrtoint(src, self.type_isize()); - } + // FIXME: If `ret_ptr` is true and `src` is not a pointer, we *should* tell LLVM that the + // LHS is a pointer and the operation should be provenance-preserving, but LLVM does not + // currently support that (https://github.com/llvm/llvm-project/issues/120837). let mut res = unsafe { llvm::LLVMBuildAtomicRMW( self.llbuilder, @@ -1273,10 +1341,10 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { dst, src, AtomicOrdering::from_generic(order), - llvm::False, // SingleThreaded + llvm::FALSE, // SingleThreaded ) }; - if requires_cast_to_int { + if ret_ptr && self.val_ty(res) != self.type_ptr() { res = self.inttoptr(res, self.type_ptr()); } res @@ -1288,14 +1356,14 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { scope: SynchronizationScope, ) { let single_threaded = match scope { - SynchronizationScope::SingleThread => llvm::True, - SynchronizationScope::CrossThread => llvm::False, + SynchronizationScope::SingleThread => true, + SynchronizationScope::CrossThread => false, }; unsafe { llvm::LLVMBuildFence( self.llbuilder, AtomicOrdering::from_generic(order), - single_threaded, + single_threaded.to_llvm_bool(), UNNAMED, ); } @@ -1319,7 +1387,7 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { fn call( &mut self, llty: &'ll Type, - fn_attrs: Option<&CodegenFnAttrs>, + fn_call_attrs: Option<&CodegenFnAttrs>, fn_abi: Option<&FnAbi<'tcx, Ty<'tcx>>>, llfn: &'ll Value, args: &[&'ll Value], @@ -1336,10 +1404,10 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { } // Emit CFI pointer type membership test - self.cfi_type_test(fn_attrs, fn_abi, instance, llfn); + self.cfi_type_test(fn_call_attrs, fn_abi, instance, llfn); // Emit KCFI operand bundle - let kcfi_bundle = self.kcfi_operand_bundle(fn_attrs, fn_abi, instance, llfn); + let kcfi_bundle = self.kcfi_operand_bundle(fn_call_attrs, fn_abi, instance, llfn); if let Some(kcfi_bundle) = kcfi_bundle.as_ref().map(|b| b.as_ref()) { bundles.push(kcfi_bundle); } @@ -1356,12 +1424,57 @@ impl<'a, 'll, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'll, 'tcx> { c"".as_ptr(), ) }; + + if let Some(instance) = instance { + // Attributes on the function definition being called + let fn_defn_attrs = self.cx.tcx.codegen_fn_attrs(instance.def_id()); + if let Some(fn_call_attrs) = fn_call_attrs + && !fn_call_attrs.target_features.is_empty() + // If there is an inline attribute and a target feature that matches + // we will add the attribute to the callsite otherwise we'll omit + // this and not add the attribute to prevent soundness issues. + && let Some(inlining_rule) = attributes::inline_attr(&self.cx, instance) + && self.cx.tcx.is_target_feature_call_safe( + &fn_call_attrs.target_features, + &fn_defn_attrs.target_features, + ) + { + attributes::apply_to_callsite( + call, + llvm::AttributePlace::Function, + &[inlining_rule], + ); + } + } + if let Some(fn_abi) = fn_abi { fn_abi.apply_attrs_callsite(self, call); } call } + fn tail_call( + &mut self, + llty: Self::Type, + fn_attrs: Option<&CodegenFnAttrs>, + fn_abi: &FnAbi<'tcx, Ty<'tcx>>, + llfn: Self::Value, + args: &[Self::Value], + funclet: Option<&Self::Funclet>, + instance: Option<Instance<'tcx>>, + ) { + let call = self.call(llty, fn_attrs, Some(fn_abi), llfn, args, funclet, instance); + llvm::LLVMSetTailCallKind(call, llvm::TailCallKind::MustTail); + + match &fn_abi.ret.mode { + PassMode::Ignore | PassMode::Indirect { .. } => self.ret_void(), + PassMode::Direct(_) | PassMode::Pair { .. } => self.ret(call), + mode @ PassMode::Cast { .. } => { + bug!("Encountered `PassMode::{mode:?}` during codegen") + } + } + } + fn zext(&mut self, val: &'ll Value, dest_ty: &'ll Type) -> &'ll Value { unsafe { llvm::LLVMBuildZExt(self.llbuilder, val, dest_ty, UNNAMED) } } @@ -1594,7 +1707,11 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> { return; } - self.call_intrinsic(intrinsic, &[self.val_ty(ptr)], &[self.cx.const_u64(size), ptr]); + if crate::llvm_util::get_version() >= (22, 0, 0) { + self.call_intrinsic(intrinsic, &[self.val_ty(ptr)], &[ptr]); + } else { + self.call_intrinsic(intrinsic, &[self.val_ty(ptr)], &[self.cx.const_u64(size), ptr]); + } } } impl<'a, 'll, CX: Borrow<SCx<'ll>>> GenericBuilder<'a, 'll, CX> { @@ -1794,48 +1911,4 @@ impl<'a, 'll, 'tcx> Builder<'a, 'll, 'tcx> { ) { self.call_intrinsic("llvm.instrprof.increment", &[], &[fn_name, hash, num_counters, index]); } - - /// Emits a call to `llvm.instrprof.mcdc.parameters`. - /// - /// This doesn't produce any code directly, but is used as input by - /// the LLVM pass that handles coverage instrumentation. - /// - /// (See clang's [`CodeGenPGO::emitMCDCParameters`] for comparison.) - /// - /// [`CodeGenPGO::emitMCDCParameters`]: - /// https://github.com/rust-lang/llvm-project/blob/5399a24/clang/lib/CodeGen/CodeGenPGO.cpp#L1124 - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_parameters( - &mut self, - fn_name: &'ll Value, - hash: &'ll Value, - bitmap_bits: &'ll Value, - ) { - self.call_intrinsic("llvm.instrprof.mcdc.parameters", &[], &[fn_name, hash, bitmap_bits]); - } - - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_tvbitmap_update( - &mut self, - fn_name: &'ll Value, - hash: &'ll Value, - bitmap_index: &'ll Value, - mcdc_temp: &'ll Value, - ) { - let args = &[fn_name, hash, bitmap_index, mcdc_temp]; - self.call_intrinsic("llvm.instrprof.mcdc.tvbitmap.update", &[], args); - } - - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_condbitmap_reset(&mut self, mcdc_temp: &'ll Value) { - self.store(self.const_i32(0), mcdc_temp, self.tcx.data_layout.i32_align.abi); - } - - #[instrument(level = "debug", skip(self))] - pub(crate) fn mcdc_condbitmap_update(&mut self, cond_index: &'ll Value, mcdc_temp: &'ll Value) { - let align = self.tcx.data_layout.i32_align.abi; - let current_tv_index = self.load(self.cx.type_i32(), mcdc_temp, align); - let new_tv_index = self.add(current_tv_index, cond_index); - self.store(new_tv_index, mcdc_temp, align); - } } |