[llvm] d29fdfb - [LTO] Avoid assert fail on failed pass plugin load (#96691)
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Wed Jun 26 11:51:27 PDT 2024
Author: Joel E. Denny
Date: 2024-06-26T14:51:24-04:00
New Revision: d29fdfbc4e3b42e9ee0295049493ba7b1471772f
URL: https://github.com/llvm/llvm-project/commit/d29fdfbc4e3b42e9ee0295049493ba7b1471772f
DIFF: https://github.com/llvm/llvm-project/commit/d29fdfbc4e3b42e9ee0295049493ba7b1471772f.diff
LOG: [LTO] Avoid assert fail on failed pass plugin load (#96691)
Without this patch, passing -load-pass-plugin=nonexistent.so to
llvm-lto2 produces a backtrace because LTOBackend.cpp does not handle
the error correctly:
```
Failed to load passes from 'nonexistant.so'. Request ignored.
Expected<T> must be checked before access or destruction.
Unchecked Expected<T> contained error:
Could not load library 'nonexistant.so': nonexistant.so: cannot open shared object file: No such file or directoryPLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
```
Any tool using `lto::Config::PassPlugins` should suffer similarly.
Based on the message "Request ignored" and the continue statement, the
intention was apparently to continue on failure to load a plugin.
However, no one appears to rely on that behavior now given that it
crashes instead, and terminating is consistent with opt.
Added:
Modified:
llvm/lib/LTO/LTOBackend.cpp
llvm/test/Feature/load_plugin_error.ll
Removed:
################################################################################
diff --git a/llvm/lib/LTO/LTOBackend.cpp b/llvm/lib/LTO/LTOBackend.cpp
index 84a69d9ff1a1f..d5d642f0d25e6 100644
--- a/llvm/lib/LTO/LTOBackend.cpp
+++ b/llvm/lib/LTO/LTOBackend.cpp
@@ -191,12 +191,8 @@ static void RegisterPassPlugins(ArrayRef<std::string> PassPlugins,
// Load requested pass plugins and let them register pass builder callbacks
for (auto &PluginFN : PassPlugins) {
auto PassPlugin = PassPlugin::Load(PluginFN);
- if (!PassPlugin) {
- errs() << "Failed to load passes from '" << PluginFN
- << "'. Request ignored.\n";
- continue;
- }
-
+ if (!PassPlugin)
+ report_fatal_error(PassPlugin.takeError(), /*gen_crash_diag=*/false);
PassPlugin->registerPassBuilderCallbacks(PB);
}
}
diff --git a/llvm/test/Feature/load_plugin_error.ll b/llvm/test/Feature/load_plugin_error.ll
index 24a7cce5d8d39..dc6e037d11387 100644
--- a/llvm/test/Feature/load_plugin_error.ll
+++ b/llvm/test/Feature/load_plugin_error.ll
@@ -1,5 +1,18 @@
-; REQUIRES: plugins, examples
+; REQUIRES: plugins
; UNSUPPORTED: target={{.*windows.*}}
-; RUN: not opt < %s -load-pass-plugin=%t/nonexistant.so -disable-output 2>&1 | FileCheck %s
-; CHECK: Could not load library {{.*}}nonexistant.so
+; RUN: not opt < %s -load-pass-plugin=%t/nonexistent.so -disable-output 2>&1 | FileCheck %s
+
+; RUN: opt %s -o %t.o
+; RUN: not llvm-lto2 run -load-pass-plugin=%t/nonexistent.so %t.o -o %t \
+; RUN: -r %t.o,test 2>&1 | \
+; RUN: FileCheck %s
+
+; CHECK: Could not load library {{.*}}nonexistent.so
+
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @test() {
+ ret void
+}
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