From 3d4a9f504780dd8f9ba4e7921cce8d8517c20aa6 Mon Sep 17 00:00:00 2001
From: Ben Kimock <kimockb@gmail.com>
Date: Fri, 9 Feb 2024 20:22:15 -0500
Subject: [PATCH] Turn the "no saved object file in work product" ICE into a
 translatable fatal error

---
 compiler/rustc_codegen_ssa/messages.ftl      | 2 ++
 compiler/rustc_codegen_ssa/src/back/write.rs | 4 +++-
 compiler/rustc_codegen_ssa/src/errors.rs     | 6 ++++++
 3 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/compiler/rustc_codegen_ssa/messages.ftl b/compiler/rustc_codegen_ssa/messages.ftl
index a80f6a1add099..fa7719d89716e 100644
--- a/compiler/rustc_codegen_ssa/messages.ftl
+++ b/compiler/rustc_codegen_ssa/messages.ftl
@@ -190,6 +190,8 @@ codegen_ssa_no_module_named =
 
 codegen_ssa_no_natvis_directory = error enumerating natvis directory: {$error}
 
+codegen_ssa_no_saved_object_file = cached cgu {$cgu_name} should have an object file, but doesn't
+
 codegen_ssa_processing_dymutil_failed = processing debug info with `dsymutil` failed: {$status}
     .note = {$output}
 
diff --git a/compiler/rustc_codegen_ssa/src/back/write.rs b/compiler/rustc_codegen_ssa/src/back/write.rs
index 9b24339d2551f..a63642d76b976 100644
--- a/compiler/rustc_codegen_ssa/src/back/write.rs
+++ b/compiler/rustc_codegen_ssa/src/back/write.rs
@@ -913,7 +913,9 @@ fn execute_copy_from_cache_work_item<B: ExtraBackendMethods>(
 
     let object = load_from_incr_comp_dir(
         cgcx.output_filenames.temp_path(OutputType::Object, Some(&module.name)),
-        module.source.saved_files.get("o").expect("no saved object file in work product"),
+        module.source.saved_files.get("o").unwrap_or_else(|| {
+            cgcx.create_dcx().emit_fatal(errors::NoSavedObjectFile { cgu_name: &module.name })
+        }),
     );
     let dwarf_object =
         module.source.saved_files.get("dwo").as_ref().and_then(|saved_dwarf_object_file| {
diff --git a/compiler/rustc_codegen_ssa/src/errors.rs b/compiler/rustc_codegen_ssa/src/errors.rs
index 06ea5b9e8f4ab..3d7903b5efb09 100644
--- a/compiler/rustc_codegen_ssa/src/errors.rs
+++ b/compiler/rustc_codegen_ssa/src/errors.rs
@@ -121,6 +121,12 @@ pub struct NoNatvisDirectory {
     pub error: Error,
 }
 
+#[derive(Diagnostic)]
+#[diag(codegen_ssa_no_saved_object_file)]
+pub struct NoSavedObjectFile<'a> {
+    pub cgu_name: &'a str,
+}
+
 #[derive(Diagnostic)]
 #[diag(codegen_ssa_copy_path_buf)]
 pub struct CopyPathBuf {