Rollup merge of rust-lang#101005 - SLASHLogin:rustc_codegen_llvm_diagnostics, r=davidtwco

Migrate rustc_codegen_llvm to SessionDiagnostics

WIP: Port current implementation of diagnostics to the new SessionDiagnostics.

Part of rust-lang#100717

```@rustbot``` label +A-translation

Author: Manishearth

compiler/rustc_codegen_llvm/src/attributes.rs

@@ -12,6 +12,7 @@ use rustc_target::spec::{FramePointer, SanitizerSet, StackProbeType, StackProtec
 use smallvec::SmallVec;
 
 use crate::attributes;
+use crate::errors::{MissingFeatures, SanitizerMemtagRequiresMte, TargetFeatureDisableOrEnable};
 use crate::llvm::AttributePlace::Function;
 use crate::llvm::{self, AllocKindFlags, Attribute, AttributeKind, AttributePlace, MemoryEffects};
 use crate::llvm_util;
@@ -82,7 +83,7 @@ pub fn sanitize_attrs<'ll>(
         let mte_feature =
             features.iter().map(|s| &s[..]).rfind(|n| ["+mte", "-mte"].contains(&&n[..]));
         if let None | Some("-mte") = mte_feature {
-            cx.tcx.sess.err("`-Zsanitizer=memtag` requires `-Ctarget-feature=+mte`");
+            cx.tcx.sess.emit_err(SanitizerMemtagRequiresMte);
         }
 
         attrs.push(llvm::AttributeKind::SanitizeMemTag.create_attr(cx.llcx));
@@ -393,13 +394,14 @@ pub fn from_fn_attrs<'ll, 'tcx>(
             .get_attrs(instance.def_id(), sym::target_feature)
             .next()
             .map_or_else(|| cx.tcx.def_span(instance.def_id()), |a| a.span);
-        let msg = format!(
-            "the target features {} must all be either enabled or disabled together",
-            f.join(", ")
-        );
-        let mut err = cx.tcx.sess.struct_span_err(span, &msg);
-        err.help("add the missing features in a `target_feature` attribute");
-        err.emit();
+        cx.tcx
+            .sess
+            .create_err(TargetFeatureDisableOrEnable {
+                features: f,
+                span: Some(span),
+                missing_features: Some(MissingFeatures),
+            })
+            .emit();
         return;
     }
 

compiler/rustc_codegen_llvm/src/back/archive.rs

@@ -12,6 +12,10 @@ use std::str;
 use object::read::macho::FatArch;
 
 use crate::common;
+use crate::errors::{
+    ArchiveBuildFailure, DlltoolFailImportLibrary, ErrorCallingDllTool, ErrorCreatingImportLibrary,
+    ErrorWritingDEFFile, UnknownArchiveKind,
+};
 use crate::llvm::archive_ro::{ArchiveRO, Child};
 use crate::llvm::{self, ArchiveKind, LLVMMachineType, LLVMRustCOFFShortExport};
 use rustc_codegen_ssa::back::archive::{ArchiveBuilder, ArchiveBuilderBuilder};
@@ -147,7 +151,7 @@ impl<'a> ArchiveBuilder<'a> for LlvmArchiveBuilder<'a> {
     fn build(mut self: Box<Self>, output: &Path) -> bool {
         match self.build_with_llvm(output) {
             Ok(any_members) => any_members,
-            Err(e) => self.sess.fatal(&format!("failed to build archive: {}", e)),
+            Err(e) => self.sess.emit_fatal(ArchiveBuildFailure { error: e }),
         }
     }
 }
@@ -217,7 +221,7 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
             match std::fs::write(&def_file_path, def_file_content) {
                 Ok(_) => {}
                 Err(e) => {
-                    sess.fatal(&format!("Error writing .DEF file: {}", e));
+                    sess.emit_fatal(ErrorWritingDEFFile { error: e });
                 }
             };
 
@@ -239,13 +243,14 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
 
             match result {
                 Err(e) => {
-                    sess.fatal(&format!("Error calling dlltool: {}", e));
+                    sess.emit_fatal(ErrorCallingDllTool { error: e });
+                }
+                Ok(output) if !output.status.success() => {
+                    sess.emit_fatal(DlltoolFailImportLibrary {
+                        stdout: String::from_utf8_lossy(&output.stdout),
+                        stderr: String::from_utf8_lossy(&output.stderr),
+                    })
                 }
-                Ok(output) if !output.status.success() => sess.fatal(&format!(
-                    "Dlltool could not create import library: {}\n{}",
-                    String::from_utf8_lossy(&output.stdout),
-                    String::from_utf8_lossy(&output.stderr)
-                )),
                 _ => {}
             }
         } else {
@@ -293,11 +298,10 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
             };
 
             if result == crate::llvm::LLVMRustResult::Failure {
-                sess.fatal(&format!(
-                    "Error creating import library for {}: {}",
+                sess.emit_fatal(ErrorCreatingImportLibrary {
                     lib_name,
-                    llvm::last_error().unwrap_or("unknown LLVM error".to_string())
-                ));
+                    error: llvm::last_error().unwrap_or("unknown LLVM error".to_string()),
+                });
             }
         };
 
@@ -308,9 +312,10 @@ impl ArchiveBuilderBuilder for LlvmArchiveBuilderBuilder {
 impl<'a> LlvmArchiveBuilder<'a> {
     fn build_with_llvm(&mut self, output: &Path) -> io::Result<bool> {
         let kind = &*self.sess.target.archive_format;
-        let kind = kind.parse::<ArchiveKind>().map_err(|_| kind).unwrap_or_else(|kind| {
-            self.sess.fatal(&format!("Don't know how to build archive of type: {}", kind))
-        });
+        let kind = kind
+            .parse::<ArchiveKind>()
+            .map_err(|_| kind)
+            .unwrap_or_else(|kind| self.sess.emit_fatal(UnknownArchiveKind { kind }));
 
         let mut additions = mem::take(&mut self.additions);
         let mut strings = Vec::new();

compiler/rustc_codegen_llvm/src/back/lto.rs

@@ -1,4 +1,5 @@
 use crate::back::write::{self, save_temp_bitcode, DiagnosticHandlers};
+use crate::errors::DynamicLinkingWithLTO;
 use crate::llvm::{self, build_string};
 use crate::{LlvmCodegenBackend, ModuleLlvm};
 use object::read::archive::ArchiveFile;
@@ -90,13 +91,7 @@ fn prepare_lto(
         }
 
         if cgcx.opts.cg.prefer_dynamic && !cgcx.opts.unstable_opts.dylib_lto {
-            diag_handler
-                .struct_err("cannot prefer dynamic linking when performing LTO")
-                .note(
-                    "only 'staticlib', 'bin', and 'cdylib' outputs are \
-                               supported with LTO",
-                )
-                .emit();
+            diag_handler.emit_err(DynamicLinkingWithLTO);
             return Err(FatalError);
         }
 

compiler/rustc_codegen_llvm/src/consts.rs

@@ -1,6 +1,7 @@
 use crate::base;
 use crate::common::{self, CodegenCx};
 use crate::debuginfo;
+use crate::errors::{InvalidMinimumAlignment, LinkageConstOrMutType, SymbolAlreadyDefined};
 use crate::llvm::{self, True};
 use crate::llvm_util;
 use crate::type_::Type;
@@ -146,7 +147,7 @@ fn set_global_alignment<'ll>(cx: &CodegenCx<'ll, '_>, gv: &'ll Value, mut align:
         match Align::from_bits(min) {
             Ok(min) => align = align.max(min),
             Err(err) => {
-                cx.sess().err(&format!("invalid minimum global alignment: {}", err));
+                cx.sess().emit_err(InvalidMinimumAlignment { err });
             }
         }
     }
@@ -174,10 +175,7 @@ fn check_and_apply_linkage<'ll, 'tcx>(
         let llty2 = if let ty::RawPtr(ref mt) = ty.kind() {
             cx.layout_of(mt.ty).llvm_type(cx)
         } else {
-            cx.sess().span_fatal(
-                cx.tcx.def_span(def_id),
-                "must have type `*const T` or `*mut T` due to `#[linkage]` attribute",
-            )
+            cx.sess().emit_fatal(LinkageConstOrMutType { span: cx.tcx.def_span(def_id) })
         };
         unsafe {
             // Declare a symbol `foo` with the desired linkage.
@@ -193,10 +191,10 @@ fn check_and_apply_linkage<'ll, 'tcx>(
             let mut real_name = "_rust_extern_with_linkage_".to_string();
             real_name.push_str(sym);
             let g2 = cx.define_global(&real_name, llty).unwrap_or_else(|| {
-                cx.sess().span_fatal(
-                    cx.tcx.def_span(def_id),
-                    &format!("symbol `{}` is already defined", &sym),
-                )
+                cx.sess().emit_fatal(SymbolAlreadyDefined {
+                    span: cx.tcx.def_span(def_id),
+                    symbol_name: sym,
+                })
             });
             llvm::LLVMRustSetLinkage(g2, llvm::Linkage::InternalLinkage);
             llvm::LLVMSetInitializer(g2, g1);

compiler/rustc_codegen_llvm/src/context.rs

@@ -3,6 +3,7 @@ use crate::back::write::to_llvm_code_model;
 use crate::callee::get_fn;
 use crate::coverageinfo;
 use crate::debuginfo;
+use crate::errors::BranchProtectionRequiresAArch64;
 use crate::llvm;
 use crate::llvm_util;
 use crate::type_::Type;
@@ -26,6 +27,7 @@ use rustc_session::config::{BranchProtection, CFGuard, CFProtection};
 use rustc_session::config::{CrateType, DebugInfo, PAuthKey, PacRet};
 use rustc_session::Session;
 use rustc_span::source_map::Span;
+use rustc_span::source_map::Spanned;
 use rustc_target::abi::{
     call::FnAbi, HasDataLayout, PointeeInfo, Size, TargetDataLayout, VariantIdx,
 };
@@ -275,7 +277,7 @@ pub unsafe fn create_module<'ll>(
 
     if let Some(BranchProtection { bti, pac_ret }) = sess.opts.unstable_opts.branch_protection {
         if sess.target.arch != "aarch64" {
-            sess.err("-Zbranch-protection is only supported on aarch64");
+            sess.emit_err(BranchProtectionRequiresAArch64);
         } else {
             llvm::LLVMRustAddModuleFlag(
                 llmod,
@@ -951,7 +953,7 @@ impl<'tcx> LayoutOfHelpers<'tcx> for CodegenCx<'_, 'tcx> {
     #[inline]
     fn handle_layout_err(&self, err: LayoutError<'tcx>, span: Span, ty: Ty<'tcx>) -> ! {
         if let LayoutError::SizeOverflow(_) = err {
-            self.sess().span_fatal(span, &err.to_string())
+            self.sess().emit_fatal(Spanned { span, node: err })
         } else {
             span_bug!(span, "failed to get layout for `{}`: {}", ty, err)
         }
@@ -969,7 +971,7 @@ impl<'tcx> FnAbiOfHelpers<'tcx> for CodegenCx<'_, 'tcx> {
         fn_abi_request: FnAbiRequest<'tcx>,
     ) -> ! {
         if let FnAbiError::Layout(LayoutError::SizeOverflow(_)) = err {
-            self.sess().span_fatal(span, &err.to_string())
+            self.sess().emit_fatal(Spanned { span, node: err })
         } else {
             match fn_abi_request {
                 FnAbiRequest::OfFnPtr { sig, extra_args } => {

compiler/rustc_codegen_llvm/src/coverageinfo/mapgen.rs

@@ -1,5 +1,6 @@
 use crate::common::CodegenCx;
 use crate::coverageinfo;
+use crate::errors::InstrumentCoverageRequiresLLVM12;
 use crate::llvm;
 
 use llvm::coverageinfo::CounterMappingRegion;
@@ -37,7 +38,7 @@ pub fn finalize<'ll, 'tcx>(cx: &CodegenCx<'ll, 'tcx>) {
     // LLVM 12.
     let version = coverageinfo::mapping_version();
     if version < 4 {
-        tcx.sess.fatal("rustc option `-C instrument-coverage` requires LLVM 12 or higher.");
+        tcx.sess.emit_fatal(InstrumentCoverageRequiresLLVM12);
     }
 
     debug!("Generating coverage map for CodegenUnit: `{}`", cx.codegen_unit.name());

compiler/rustc_codegen_llvm/src/errors.rs

@@ -0,0 +1,139 @@
+use std::borrow::Cow;
+
+use rustc_errors::fluent;
+use rustc_errors::DiagnosticBuilder;
+use rustc_errors::ErrorGuaranteed;
+use rustc_errors::Handler;
+use rustc_errors::IntoDiagnostic;
+use rustc_macros::{Diagnostic, Subdiagnostic};
+use rustc_span::Span;
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_unknown_ctarget_feature_prefix)]
+#[note]
+pub(crate) struct UnknownCTargetFeaturePrefix<'a> {
+    pub feature: &'a str,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_unknown_ctarget_feature)]
+#[note]
+pub(crate) struct UnknownCTargetFeature<'a> {
+    pub feature: &'a str,
+    #[subdiagnostic]
+    pub rust_feature: PossibleFeature<'a>,
+}
+
+#[derive(Subdiagnostic)]
+pub(crate) enum PossibleFeature<'a> {
+    #[help(possible_feature)]
+    Some { rust_feature: &'a str },
+    #[help(consider_filing_feature_request)]
+    None,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_error_creating_import_library)]
+pub(crate) struct ErrorCreatingImportLibrary<'a> {
+    pub lib_name: &'a str,
+    pub error: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_instrument_coverage_requires_llvm_12)]
+pub(crate) struct InstrumentCoverageRequiresLLVM12;
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_symbol_already_defined)]
+pub(crate) struct SymbolAlreadyDefined<'a> {
+    #[primary_span]
+    pub span: Span,
+    pub symbol_name: &'a str,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_branch_protection_requires_aarch64)]
+pub(crate) struct BranchProtectionRequiresAArch64;
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_invalid_minimum_alignment)]
+pub(crate) struct InvalidMinimumAlignment {
+    pub err: String,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_linkage_const_or_mut_type)]
+pub(crate) struct LinkageConstOrMutType {
+    #[primary_span]
+    pub span: Span,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_sanitizer_memtag_requires_mte)]
+pub(crate) struct SanitizerMemtagRequiresMte;
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_archive_build_failure)]
+pub(crate) struct ArchiveBuildFailure {
+    pub error: std::io::Error,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_error_writing_def_file)]
+pub(crate) struct ErrorWritingDEFFile {
+    pub error: std::io::Error,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_error_calling_dlltool)]
+pub(crate) struct ErrorCallingDllTool {
+    pub error: std::io::Error,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_dlltool_fail_import_library)]
+pub(crate) struct DlltoolFailImportLibrary<'a> {
+    pub stdout: Cow<'a, str>,
+    pub stderr: Cow<'a, str>,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_unknown_archive_kind)]
+pub(crate) struct UnknownArchiveKind<'a> {
+    pub kind: &'a str,
+}
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_dynamic_linking_with_lto)]
+#[note]
+pub(crate) struct DynamicLinkingWithLTO;
+
+#[derive(Diagnostic)]
+#[diag(codegen_llvm_fail_parsing_target_machine_config_to_target_machine)]
+pub(crate) struct FailParsingTargetMachineConfigToTargetMachine {
+    pub error: String,
+}
+
+pub(crate) struct TargetFeatureDisableOrEnable<'a> {
+    pub features: &'a [&'a str],
+    pub span: Option<Span>,
+    pub missing_features: Option<MissingFeatures>,
+}
+
+#[derive(Subdiagnostic)]
+#[help(codegen_llvm_missing_features)]
+pub(crate) struct MissingFeatures;
+
+impl IntoDiagnostic<'_, ErrorGuaranteed> for TargetFeatureDisableOrEnable<'_> {
+    fn into_diagnostic(self, sess: &'_ Handler) -> DiagnosticBuilder<'_, ErrorGuaranteed> {
+        let mut diag = sess.struct_err(fluent::codegen_llvm_target_feature_disable_or_enable);
+        if let Some(span) = self.span {
+            diag.set_span(span);
+        };
+        if let Some(missing_features) = self.missing_features {
+            diag.subdiagnostic(missing_features);
+        }
+        diag.set_arg("features", self.features.join(", "));
+        diag
+    }
+}