https://github.com/Michael137 created
https://github.com/llvm/llvm-project/pull/95405
This is a minimal reproducer for a crash reported internally where we would try
to call `DumpTypeDescription` on an incomplete type. This crash surfaced as
part of an NFC refactor of some of the logic in `GetCompleteQualType`:
```
(lldb) expr -l objc -- *(id)0x1234
Stack dump:
0. Program arguments: ./bin/lldb a.out -o "b main" -o run -o "expr -l objc
-- *(id)0x1234"
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH
or set the environment var LLVM_SYMBOLIZER_PATH to point to it):
0 lldb 0x0000000102ec768c
llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1 lldb 0x0000000102ec6010 llvm::sys::RunSignalHandlers() +
112
2 lldb 0x0000000102ec7fa8 SignalHandler(int) + 292
3 libsystem_platform.dylib 0x000000018c7a8c44 _sigtramp + 56
4 LLDB 0x0000000116b2030c
lldb_private::TypeSystemClang::DumpTypeDescription(void*,
lldb_private::Stream&, lldb::DescriptionLevel,
lldb_private::ExecutionContextScope*) + 588
5 LLDB 0x00000001166b5124
lldb_private::CompilerType::DumpTypeDescription(lldb_private::Stream*,
lldb::DescriptionLevel, lldb_private::ExecutionContextScope*) const + 228
6 LLDB 0x0000000116d4f08c
IRForTarget::CreateResultVariable(llvm::Function&) + 2076
```
rdar://129633122
>From 2e84cf46b9378307d9059aa1ce2a97046b0866b4 Mon Sep 17 00:00:00 2001
From: Michael Buch <michaelbuc...@gmail.com>
Date: Thu, 13 Jun 2024 14:00:07 +0100
Subject: [PATCH] [lldb][test] Add test for completing ObjCObjectType
This is a minimal reproducer for a crash reported internally
where we would try to call `DumpTypeDescription` on an incomplete
type. This crash surfaced as part of an NFC refactor of some
of the logic in `GetCompleteQualType`:
```
(lldb) expr -l objc -- *(id)0x1234
Stack dump:
0. Program arguments: ./bin/lldb a.out -o "b main" -o run -o "expr -l objc
-- *(id)0x1234"
Stack dump without symbol names (ensure you have llvm-symbolizer in your PATH
or set the environment var LLVM_SYMBOLIZER_PATH to point to it):
0 lldb 0x0000000102ec768c
llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) + 56
1 lldb 0x0000000102ec6010 llvm::sys::RunSignalHandlers() +
112
2 lldb 0x0000000102ec7fa8 SignalHandler(int) + 292
3 libsystem_platform.dylib 0x000000018c7a8c44 _sigtramp + 56
4 LLDB 0x0000000116b2030c
lldb_private::TypeSystemClang::DumpTypeDescription(void*,
lldb_private::Stream&, lldb::DescriptionLevel,
lldb_private::ExecutionContextScope*) + 588
5 LLDB 0x00000001166b5124
lldb_private::CompilerType::DumpTypeDescription(lldb_private::Stream*,
lldb::DescriptionLevel, lldb_private::ExecutionContextScope*) const + 228
6 LLDB 0x0000000116d4f08c
IRForTarget::CreateResultVariable(llvm::Function&) + 2076
```
rdar://129633122
---
lldb/test/Shell/Expr/TestObjCIDCast.cpp | 10 ++++++++++
1 file changed, 10 insertions(+)
create mode 100644 lldb/test/Shell/Expr/TestObjCIDCast.cpp
diff --git a/lldb/test/Shell/Expr/TestObjCIDCast.cpp
b/lldb/test/Shell/Expr/TestObjCIDCast.cpp
new file mode 100644
index 0000000000000..011bd943b5967
--- /dev/null
+++ b/lldb/test/Shell/Expr/TestObjCIDCast.cpp
@@ -0,0 +1,10 @@
+// RUN: %clangxx_host %s -g -o %t
+//
+// RUN: %lldb -f %t \
+// RUN: -o "settings set interpreter.stop-command-source-on-error false" \
+// RUN: -o "b main" -o run -o "expression --language objc -- *(id)0x1234" -o
exit 2>&1 | FileCheck %s
+
+int main() { return 0; }
+
+// CHECK: (lldb) expression --language objc -- *(id)0x1234
+// CHECK: error: Couldn't apply expression side effects : Couldn't
dematerialize a result variable: couldn't read its memory
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