From: Douglas Gregor <dgregor@apple.com>
Date: Wed, 1 Jul 2009 23:29:14 +0000 (+0000)
Subject: Fix PR 4489, a PCH crash during de-serialization.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=ae4df629dda13736c9e3251921b168084cd01978;p=clang

Fix PR 4489, a PCH crash during de-serialization.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74664 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Frontend/PCHReaderStmt.cpp b/lib/Frontend/PCHReaderStmt.cpp
index d096388061..eccb53bf81 100644
--- a/lib/Frontend/PCHReaderStmt.cpp
+++ b/lib/Frontend/PCHReaderStmt.cpp
@@ -1133,6 +1133,5 @@ Stmt *PCHReader::ReadStmt(llvm::BitstreamCursor &Cursor) {
     StmtStack.push_back(S);
   }
   assert(StmtStack.size() == 1 && "Extra expressions on stack!");
-  SwitchCaseStmts.clear();
   return StmtStack.back();
 }
diff --git a/lib/Frontend/PCHWriterStmt.cpp b/lib/Frontend/PCHWriterStmt.cpp
index c63c03c882..5235326e9f 100644
--- a/lib/Frontend/PCHWriterStmt.cpp
+++ b/lib/Frontend/PCHWriterStmt.cpp
@@ -826,5 +826,4 @@ void PCHWriter::FlushStmts() {
   }
   
   StmtsToEmit.clear();
-  SwitchCaseIDs.clear();
 }
diff --git a/test/PCH/pr4489.c b/test/PCH/pr4489.c
new file mode 100644
index 0000000000..696da5bbb4
--- /dev/null
+++ b/test/PCH/pr4489.c
@@ -0,0 +1,20 @@
+// RUN: clang -x c-header -o %t.pch %s &&
+// RUN: clang -include %t -x c /dev/null -emit-llvm -S -o -
+// PR 4489: Crash with PCH
+
+typedef struct _IO_FILE FILE;
+extern int fprintf (struct _IO_FILE *__restrict __stream,
+                    __const char *__restrict __format, ...);
+
+int x(void)
+{
+  switch (1) {
+    case 2: ;
+      int y = 0;
+  }
+}
+
+void y(void) {
+  extern char z;
+  fprintf (0, "a");
+}
\ No newline at end of file