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Rollup merge of #127779 - momvart:should_codegen_hook, r=cjgillot 

Add a hook for `should_codegen_locally`

This PR lifts the module-local function `should_codegen_locally` to `TyCtxt` as a hook.
In addition to monomorphization, this function is used for checking the dependency of `compiler_builtins` on other libraries. Moving this function to the hooks also makes overriding it possible for the tools that use the rustc interface.
This commit is contained in:
Matthias Krüger 2024-07-20 13:24:52 +02:00 committed by GitHub
parent 3a9bfa397d 9b80250abb
commit 9a6f8ccf3a
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
9 changed files with 62 additions and 58 deletions
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2
compiler/rustc_codegen_cranelift/src/abi/mod.rs
View File

@ -10,12 +10,12 @@ use std::mem;
use cranelift_codegen::ir::{ArgumentPurpose, SigRef};
use cranelift_codegen::isa::CallConv;
use cranelift_module::ModuleError;
use rustc_codegen_ssa::base::is_call_from_compiler_builtins_to_upstream_monomorphization;
use rustc_codegen_ssa::errors::CompilerBuiltinsCannotCall;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::ty::layout::FnAbiOf;
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::TypeVisitableExt;
use rustc_monomorphize::is_call_from_compiler_builtins_to_upstream_monomorphization;
use rustc_session::Session;
use rustc_span::source_map::Spanned;
use rustc_target::abi::call::{Conv, FnAbi, PassMode};

2
compiler/rustc_codegen_cranelift/src/base.rs
View File

@ -5,13 +5,13 @@ use cranelift_codegen::CodegenError;
use cranelift_frontend::{FunctionBuilder, FunctionBuilderContext};
use cranelift_module::ModuleError;
use rustc_ast::InlineAsmOptions;
use rustc_codegen_ssa::base::is_call_from_compiler_builtins_to_upstream_monomorphization;
use rustc_index::IndexVec;
use rustc_middle::middle::codegen_fn_attrs::CodegenFnAttrFlags;
use rustc_middle::ty::adjustment::PointerCoercion;
use rustc_middle::ty::layout::FnAbiOf;
use rustc_middle::ty::print::with_no_trimmed_paths;
use rustc_middle::ty::TypeVisitableExt;
use rustc_monomorphize::is_call_from_compiler_builtins_to_upstream_monomorphization;
use crate::constant::ConstantCx;
use crate::debuginfo::{FunctionDebugContext, TypeDebugContext};

1
compiler/rustc_codegen_cranelift/src/lib.rs
View File

@ -24,7 +24,6 @@ extern crate rustc_hir;
extern crate rustc_incremental;
extern crate rustc_index;
extern crate rustc_metadata;
extern crate rustc_monomorphize;
extern crate rustc_session;
extern crate rustc_span;
extern crate rustc_target;

28
compiler/rustc_codegen_ssa/src/base.rs
View File

@ -806,6 +806,34 @@ pub fn codegen_crate<B: ExtraBackendMethods>(
ongoing_codegen
}
/// Returns whether a call from the current crate to the [`Instance`] would produce a call
/// from `compiler_builtins` to a symbol the linker must resolve.
///
/// Such calls from `compiler_bultins` are effectively impossible for the linker to handle. Some
/// linkers will optimize such that dead calls to unresolved symbols are not an error, but this is
/// not guaranteed. So we used this function in codegen backends to ensure we do not generate any
/// unlinkable calls.
///
/// Note that calls to LLVM intrinsics are uniquely okay because they won't make it to the linker.
pub fn is_call_from_compiler_builtins_to_upstream_monomorphization<'tcx>(
tcx: TyCtxt<'tcx>,
instance: Instance<'tcx>,
) -> bool {
fn is_llvm_intrinsic(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
if let Some(name) = tcx.codegen_fn_attrs(def_id).link_name {
name.as_str().starts_with("llvm.")
} else {
false
}
}
let def_id = instance.def_id();
!def_id.is_local()
&& tcx.is_compiler_builtins(LOCAL_CRATE)
&& !is_llvm_intrinsic(tcx, def_id)
&& !tcx.should_codegen_locally(instance)
}
impl CrateInfo {
pub fn new(tcx: TyCtxt<'_>, target_cpu: String) -> CrateInfo {
let crate_types = tcx.crate_types().to_vec();

3
compiler/rustc_codegen_ssa/src/mir/block.rs
View File

@ -3,7 +3,7 @@ use super::operand::OperandValue::{Immediate, Pair, Ref, ZeroSized};
use super::place::{PlaceRef, PlaceValue};
use super::{CachedLlbb, FunctionCx, LocalRef};
use crate::base;
use crate::base::{self, is_call_from_compiler_builtins_to_upstream_monomorphization};
use crate::common::{self, IntPredicate};
use crate::errors::CompilerBuiltinsCannotCall;
use crate::meth;
@ -18,7 +18,6 @@ use rustc_middle::ty::layout::{HasTyCtxt, LayoutOf, ValidityRequirement};
use rustc_middle::ty::print::{with_no_trimmed_paths, with_no_visible_paths};
use rustc_middle::ty::{self, Instance, Ty};
use rustc_middle::{bug, span_bug};
use rustc_monomorphize::is_call_from_compiler_builtins_to_upstream_monomorphization;
use rustc_session::config::OptLevel;
use rustc_span::{source_map::Spanned, sym, Span};
use rustc_target::abi::call::{ArgAbi, FnAbi, PassMode, Reg};

4
compiler/rustc_middle/src/hooks/mod.rs
View File

@ -103,6 +103,10 @@ declare_hooks! {
/// Create a list-like THIR representation for debugging.
hook thir_flat(key: LocalDefId) -> String;
/// Returns `true` if we should codegen an instance in the local crate, or returns `false` if we
/// can just link to the upstream crate and therefore don't need a mono item.
hook should_codegen_locally(instance: crate::ty::Instance<'tcx>) -> bool;
}
#[cold]

39
compiler/rustc_monomorphize/src/collector.rs
View File

@ -228,6 +228,7 @@ use rustc_middle::ty::{
self, AssocKind, GenericParamDefKind, Instance, InstanceKind, Ty, TyCtxt, TypeFoldable,
TypeVisitableExt, VtblEntry,
};
use rustc_middle::util::Providers;
use rustc_middle::{bug, span_bug};
use rustc_session::config::EntryFnType;
use rustc_session::Limit;
@ -399,7 +400,7 @@ fn collect_items_rec<'tcx>(
let instance = Instance::mono(tcx, def_id);
// Sanity check whether this ended up being collected accidentally
debug_assert!(should_codegen_locally(tcx, instance));
debug_assert!(tcx.should_codegen_locally(instance));
let DefKind::Static { nested, .. } = tcx.def_kind(def_id) else { bug!() };
// Nested statics have no type.
@ -431,7 +432,7 @@ fn collect_items_rec<'tcx>(
}
MonoItem::Fn(instance) => {
// Sanity check whether this ended up being collected accidentally
debug_assert!(should_codegen_locally(tcx, instance));
debug_assert!(tcx.should_codegen_locally(instance));
// Keep track of the monomorphization recursion depth
recursion_depth_reset = Some(check_recursion_limit(
@ -475,7 +476,7 @@ fn collect_items_rec<'tcx>(
}
hir::InlineAsmOperand::SymStatic { path: _, def_id } => {
let instance = Instance::mono(tcx, *def_id);
if should_codegen_locally(tcx, instance) {
if tcx.should_codegen_locally(instance) {
trace!("collecting static {:?}", def_id);
used_items.push(dummy_spanned(MonoItem::Static(*def_id)));
}
@ -712,7 +713,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
if let ty::Closure(def_id, args) = *source_ty.kind() {
let instance =
Instance::resolve_closure(self.tcx, def_id, args, ty::ClosureKind::FnOnce);
if should_codegen_locally(self.tcx, instance) {
if self.tcx.should_codegen_locally(instance) {
self.used_items.push(create_fn_mono_item(self.tcx, instance, span));
}
} else {
@ -722,7 +723,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
mir::Rvalue::ThreadLocalRef(def_id) => {
assert!(self.tcx.is_thread_local_static(def_id));
let instance = Instance::mono(self.tcx, def_id);
if should_codegen_locally(self.tcx, instance) {
if self.tcx.should_codegen_locally(instance) {
trace!("collecting thread-local static {:?}", def_id);
self.used_items.push(respan(span, MonoItem::Static(def_id)));
}
@ -749,7 +750,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
let tcx = self.tcx;
let push_mono_lang_item = |this: &mut Self, lang_item: LangItem| {
let instance = Instance::mono(tcx, tcx.require_lang_item(lang_item, Some(source)));
if should_codegen_locally(tcx, instance) {
if tcx.should_codegen_locally(instance) {
this.used_items.push(create_fn_mono_item(tcx, instance, source));
}
};
@ -783,7 +784,7 @@ impl<'a, 'tcx> MirVisitor<'tcx> for MirUsedCollector<'a, 'tcx> {
}
mir::InlineAsmOperand::SymStatic { def_id } => {
let instance = Instance::mono(self.tcx, def_id);
if should_codegen_locally(self.tcx, instance) {
if self.tcx.should_codegen_locally(instance) {
trace!("collecting asm sym static {:?}", def_id);
self.used_items.push(respan(source, MonoItem::Static(def_id)));
}
@ -873,7 +874,7 @@ fn visit_instance_use<'tcx>(
output: &mut MonoItems<'tcx>,
) {
debug!("visit_item_use({:?}, is_direct_call={:?})", instance, is_direct_call);
if !should_codegen_locally(tcx, instance) {
if !tcx.should_codegen_locally(instance) {
return;
}
if let ty::InstanceKind::Intrinsic(def_id) = instance.def {
@ -885,13 +886,13 @@ fn visit_instance_use<'tcx>(
// codegen a call to that function without generating code for the function itself.
let def_id = tcx.require_lang_item(LangItem::PanicNounwind, None);
let panic_instance = Instance::mono(tcx, def_id);
if should_codegen_locally(tcx, panic_instance) {
if tcx.should_codegen_locally(panic_instance) {
output.push(create_fn_mono_item(tcx, panic_instance, source));
}
} else if tcx.has_attr(def_id, sym::rustc_intrinsic) {
// Codegen the fallback body of intrinsics with fallback bodies
let instance = ty::Instance::new(def_id, instance.args);
if should_codegen_locally(tcx, instance) {
if tcx.should_codegen_locally(instance) {
output.push(create_fn_mono_item(tcx, instance, source));
}
}
@ -930,7 +931,7 @@ fn visit_instance_use<'tcx>(
/// Returns `true` if we should codegen an instance in the local crate, or returns `false` if we
/// can just link to the upstream crate and therefore don't need a mono item.
pub(crate) fn should_codegen_locally<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance<'tcx>) -> bool {
fn should_codegen_locally<'tcx>(tcx: TyCtxtAt<'tcx>, instance: Instance<'tcx>) -> bool {
let Some(def_id) = instance.def.def_id_if_not_guaranteed_local_codegen() else {
return true;
};
@ -946,7 +947,7 @@ pub(crate) fn should_codegen_locally<'tcx>(tcx: TyCtxt<'tcx>, instance: Instance
}
if tcx.is_reachable_non_generic(def_id)
|| instance.polymorphize(tcx).upstream_monomorphization(tcx).is_some()
|| instance.polymorphize(*tcx).upstream_monomorphization(*tcx).is_some()
{
// We can link to the item in question, no instance needed in this crate.
return false;
@ -1127,7 +1128,7 @@ fn create_mono_items_for_vtable_methods<'tcx>(
None
}
VtblEntry::Method(instance) => {
Some(*instance).filter(|instance| should_codegen_locally(tcx, *instance))
Some(*instance).filter(|instance| tcx.should_codegen_locally(*instance))
}
})
.map(|item| create_fn_mono_item(tcx, item, source));
@ -1144,7 +1145,7 @@ fn collect_alloc<'tcx>(tcx: TyCtxt<'tcx>, alloc_id: AllocId, output: &mut MonoIt
GlobalAlloc::Static(def_id) => {
assert!(!tcx.is_thread_local_static(def_id));
let instance = Instance::mono(tcx, def_id);
if should_codegen_locally(tcx, instance) {
if tcx.should_codegen_locally(instance) {
trace!("collecting static {:?}", def_id);
output.push(dummy_spanned(MonoItem::Static(def_id)));
}
@ -1162,7 +1163,7 @@ fn collect_alloc<'tcx>(tcx: TyCtxt<'tcx>, alloc_id: AllocId, output: &mut MonoIt
}
}
GlobalAlloc::Function { instance, .. } => {
if should_codegen_locally(tcx, instance) {
if tcx.should_codegen_locally(instance) {
trace!("collecting {:?} with {:#?}", alloc_id, instance);
output.push(create_fn_mono_item(tcx, instance, DUMMY_SP));
}
@ -1284,7 +1285,7 @@ fn visit_mentioned_item<'tcx>(
if let ty::Closure(def_id, args) = *source_ty.kind() {
let instance =
Instance::resolve_closure(tcx, def_id, args, ty::ClosureKind::FnOnce);
if should_codegen_locally(tcx, instance) {
if tcx.should_codegen_locally(instance) {
output.push(create_fn_mono_item(tcx, instance, span));
}
} else {
@ -1557,7 +1558,7 @@ fn create_mono_items_for_default_impls<'tcx>(
let instance = ty::Instance::expect_resolve(tcx, param_env, method.def_id, args, DUMMY_SP);
let mono_item = create_fn_mono_item(tcx, instance, DUMMY_SP);
if mono_item.node.is_instantiable(tcx) && should_codegen_locally(tcx, instance) {
if mono_item.node.is_instantiable(tcx) && tcx.should_codegen_locally(instance) {
output.push(mono_item);
}
}
@ -1613,3 +1614,7 @@ pub(crate) fn collect_crate_mono_items<'tcx>(
(mono_items, state.usage_map.into_inner())
}
pub fn provide(providers: &mut Providers) {
providers.hooks.should_codegen_locally = should_codegen_locally;
}

37
compiler/rustc_monomorphize/src/lib.rs
View File

@ -5,14 +5,11 @@
use rustc_hir::lang_items::LangItem;
use rustc_middle::bug;
use rustc_middle::query::{Providers, TyCtxtAt};
use rustc_middle::query::TyCtxtAt;
use rustc_middle::traits;
use rustc_middle::ty::adjustment::CustomCoerceUnsized;
use rustc_middle::ty::Instance;
use rustc_middle::ty::TyCtxt;
use rustc_middle::ty::{self, Ty};
use rustc_span::def_id::DefId;
use rustc_span::def_id::LOCAL_CRATE;
use rustc_middle::util::Providers;
use rustc_span::ErrorGuaranteed;
mod collector;
@ -21,8 +18,6 @@ mod partitioning;
mod polymorphize;
mod util;
use collector::should_codegen_locally;
rustc_fluent_macro::fluent_messages! { "../messages.ftl" }
fn custom_coerce_unsize_info<'tcx>(
@ -47,34 +42,6 @@ fn custom_coerce_unsize_info<'tcx>(
}
}
/// Returns whether a call from the current crate to the [`Instance`] would produce a call
/// from `compiler_builtins` to a symbol the linker must resolve.
///
/// Such calls from `compiler_bultins` are effectively impossible for the linker to handle. Some
/// linkers will optimize such that dead calls to unresolved symbols are not an error, but this is
/// not guaranteed. So we used this function in codegen backends to ensure we do not generate any
/// unlinkable calls.
///
/// Note that calls to LLVM intrinsics are uniquely okay because they won't make it to the linker.
pub fn is_call_from_compiler_builtins_to_upstream_monomorphization<'tcx>(
tcx: TyCtxt<'tcx>,
instance: Instance<'tcx>,
) -> bool {
fn is_llvm_intrinsic(tcx: TyCtxt<'_>, def_id: DefId) -> bool {
if let Some(name) = tcx.codegen_fn_attrs(def_id).link_name {
name.as_str().starts_with("llvm.")
} else {
false
}
}
let def_id = instance.def_id();
!def_id.is_local()
&& tcx.is_compiler_builtins(LOCAL_CRATE)
&& !is_llvm_intrinsic(tcx, def_id)
&& !should_codegen_locally(tcx, instance)
}
pub fn provide(providers: &mut Providers) {
partitioning::provide(providers);
polymorphize::provide(providers);

4
compiler/rustc_monomorphize/src/partitioning.rs
View File

@ -112,9 +112,9 @@ use rustc_middle::mir::mono::{
CodegenUnit, CodegenUnitNameBuilder, InstantiationMode, Linkage, MonoItem, MonoItemData,
Visibility,
};
use rustc_middle::query::Providers;
use rustc_middle::ty::print::{characteristic_def_id_of_type, with_no_trimmed_paths};
use rustc_middle::ty::{self, visit::TypeVisitableExt, InstanceKind, TyCtxt};
use rustc_middle::util::Providers;
use rustc_session::config::{DumpMonoStatsFormat, SwitchWithOptPath};
use rustc_session::CodegenUnits;
use rustc_span::symbol::Symbol;
@ -1314,4 +1314,6 @@ pub fn provide(providers: &mut Providers) {
.find(|cgu| cgu.name() == name)
.unwrap_or_else(|| panic!("failed to find cgu with name {name:?}"))
};
collector::provide(providers);
}