From abc7901e4e74e5561d4a7a31fc8af05d0c73b6a3 Mon Sep 17 00:00:00 2001
From: Duncan Sands <baldrick@free.fr>
Date: Thu, 21 Oct 2010 08:57:29 +0000
Subject: Fix the cleanup process of exception information in JIT.  Now JIT
 deregisters registered by it FDE structures allowing consecutive JIT runs to
 succeed.  Patch by Yuri.  Fixes PR8285.

llvm-svn: 117004
---
 llvm/lib/ExecutionEngine/ExecutionEngine.cpp | 16 +++++++++++++---
 llvm/lib/ExecutionEngine/JIT/JIT.cpp         |  6 ++++++
 2 files changed, 19 insertions(+), 3 deletions(-)

(limited to 'llvm/lib/ExecutionEngine')

diff --git a/llvm/lib/ExecutionEngine/ExecutionEngine.cpp b/llvm/lib/ExecutionEngine/ExecutionEngine.cpp
index be7f1f56a95..77082c4d041 100644
--- a/llvm/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/llvm/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -47,12 +47,12 @@ ExecutionEngine *(*ExecutionEngine::JITCtor)(
   const SmallVectorImpl<std::string>& MAttrs) = 0;
 ExecutionEngine *(*ExecutionEngine::InterpCtor)(Module *M,
                                                 std::string *ErrorStr) = 0;
-ExecutionEngine::EERegisterFn ExecutionEngine::ExceptionTableRegister = 0;
-
 
 ExecutionEngine::ExecutionEngine(Module *M)
   : EEState(*this),
-    LazyFunctionCreator(0) {
+    LazyFunctionCreator(0),
+    ExceptionTableRegister(0), 
+    ExceptionTableDeregister(0) {
   CompilingLazily         = false;
   GVCompilationDisabled   = false;
   SymbolSearchingDisabled = false;
@@ -66,6 +66,16 @@ ExecutionEngine::~ExecutionEngine() {
     delete Modules[i];
 }
 
+void ExecutionEngine::DeregisterAllTables() {
+  if (ExceptionTableDeregister) {
+    std::vector<void*>::iterator it = AllExceptionTables.begin();
+    std::vector<void*>::iterator ite = AllExceptionTables.end();
+    for (; it != ite; ++it)
+      ExceptionTableDeregister(*it);
+    AllExceptionTables.clear();
+  }
+}
+
 namespace {
 // This class automatically deletes the memory block when the GlobalVariable is
 // destroyed.
diff --git a/llvm/lib/ExecutionEngine/JIT/JIT.cpp b/llvm/lib/ExecutionEngine/JIT/JIT.cpp
index 63125b79c8e..8104ab995a4 100644
--- a/llvm/lib/ExecutionEngine/JIT/JIT.cpp
+++ b/llvm/lib/ExecutionEngine/JIT/JIT.cpp
@@ -87,6 +87,7 @@ extern "C" void LLVMLinkInJIT() {
 // values of an opaque key, used by libgcc to find dwarf tables.
 
 extern "C" void __register_frame(void*);
+extern "C" void __deregister_frame(void*);
 
 #if defined(__APPLE__) && MAC_OS_X_VERSION_MAX_ALLOWED <= 1050
 # define USE_KEYMGR 1
@@ -318,8 +319,10 @@ JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
     LOI = (LibgccObjectInfo*)calloc(sizeof(struct LibgccObjectInfo), 1); 
   _keymgr_set_and_unlock_processwide_ptr(KEYMGR_GCC3_DW2_OBJ_LIST, LOI);
   InstallExceptionTableRegister(DarwinRegisterFrame);
+  // Not sure about how to deregister on Darwin.
 #else
   InstallExceptionTableRegister(__register_frame);
+  InstallExceptionTableDeregister(__deregister_frame);
 #endif // __APPLE__
 #endif // __GNUC__
   
@@ -328,6 +331,9 @@ JIT::JIT(Module *M, TargetMachine &tm, TargetJITInfo &tji,
 }
 
 JIT::~JIT() {
+  // Unregister all exception tables registered by this JIT.
+  DeregisterAllTables();
+  // Cleanup.
   AllJits->Remove(this);
   delete jitstate;
   delete JCE;
-- 
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