dyung created this revision.
dyung added a reviewer: aprantl.
dyung added a subscriber: cfe-commits.
In our internal testing, we found a crash in the compiler which was reduced to
the attached test case. The issue was "fixed" a while back with Adrian's change
in r248069 as the code causing the crash was changed and consequently no longer
crashes. The crash occurred in the function CGDebugInfo::EmitImportDecl() in
CGDebugInfo.cpp. We did not determine the underlying cause of the crash since
it no longer occurs, but wanted to contribute the test case along with some
info about it in case anyone might wish to investigate further in case the
issue might still exist somewhere.
The function EmitImportDecl contained the following code:
```
void CGDebugInfo::EmitImportDecl(const ImportDecl &ID) {
auto *Reader = CGM.getContext().getExternalSource();
auto Info = Reader->getSourceDescriptor(*ID.getImportedModule());
```
The crash was because getExternalSource() was returning a null pointer which
was assigned into Reader, and when the next line tried to use that pointer, it
caused a crash.
http://reviews.llvm.org/D19048
Files:
test/Modules/Inputs/getSourceDescriptor-crash/h1.h
test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
test/Modules/getSourceDescriptor-crash.cpp
Index: test/Modules/getSourceDescriptor-crash.cpp
===================================================================
--- test/Modules/getSourceDescriptor-crash.cpp
+++ test/Modules/getSourceDescriptor-crash.cpp
@@ -0,0 +1,4 @@
+// RUN: %clang -I %S/Inputs/getSourceDescriptor-crash -c -g
-fimplicit-module-maps %s
+
+#include "h1.h"
+#include "h1.h"
Index: test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
===================================================================
--- test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
+++ test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
@@ -0,0 +1,3 @@
+module foo {
+ header "h1.h"
+}
\ No newline at end of file
Index: test/Modules/Inputs/getSourceDescriptor-crash/h1.h
===================================================================
--- test/Modules/Inputs/getSourceDescriptor-crash/h1.h
+++ test/Modules/Inputs/getSourceDescriptor-crash/h1.h
@@ -0,0 +1 @@
+#pragma once
Index: test/Modules/getSourceDescriptor-crash.cpp
===================================================================
--- test/Modules/getSourceDescriptor-crash.cpp
+++ test/Modules/getSourceDescriptor-crash.cpp
@@ -0,0 +1,4 @@
+// RUN: %clang -I %S/Inputs/getSourceDescriptor-crash -c -g -fimplicit-module-maps %s
+
+#include "h1.h"
+#include "h1.h"
Index: test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
===================================================================
--- test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
+++ test/Modules/Inputs/getSourceDescriptor-crash/module.modulemap
@@ -0,0 +1,3 @@
+module foo {
+ header "h1.h"
+}
\ No newline at end of file
Index: test/Modules/Inputs/getSourceDescriptor-crash/h1.h
===================================================================
--- test/Modules/Inputs/getSourceDescriptor-crash/h1.h
+++ test/Modules/Inputs/getSourceDescriptor-crash/h1.h
@@ -0,0 +1 @@
+#pragma once
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