From 5dd391b4bb70e1ed88331b1d0316da97f29c038a Mon Sep 17 00:00:00 2001
From: Reid Spencer <rspencer@reidspencer.com>
Date: Fri, 15 Dec 2006 19:49:23 +0000
Subject: [PATCH] Fix long standing issue with propagating error message back
 to caller. This has been a problem since exceptions were removed from the
 BytecodeReader. Error messages are now captured from
 ModuleProvider::releaseModule as well as after a longjmp.

llvm-svn: 32608
---
 llvm/lib/Bytecode/Reader/Reader.cpp         | 14 ++++++++++++--
 llvm/lib/Bytecode/Reader/ReaderWrappers.cpp | 10 +++++-----
 2 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/llvm/lib/Bytecode/Reader/Reader.cpp b/llvm/lib/Bytecode/Reader/Reader.cpp
index e2ab8c10e671..1c747af948c7 100644
--- a/llvm/lib/Bytecode/Reader/Reader.cpp
+++ b/llvm/lib/Bytecode/Reader/Reader.cpp
@@ -1758,8 +1758,13 @@ void BytecodeReader::ParseFunctionLazily() {
 /// @see ParseBytecode
 bool BytecodeReader::ParseFunction(Function* Func, std::string* ErrMsg) {
 
-  if (setjmp(context))
+  if (setjmp(context)) {
+    // Set caller's error message, if requested
+    if (ErrMsg)
+      *ErrMsg = ErrorMsg;
+    // Indicate an error occurred
     return true;
+  }
 
   // Find {start, end} pointers and slot in the map. If not there, we're done.
   LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.find(Func);
@@ -1788,8 +1793,13 @@ bool BytecodeReader::ParseFunction(Function* Func, std::string* ErrMsg) {
 /// to materialize the functions.
 /// @see ParseBytecode
 bool BytecodeReader::ParseAllFunctionBodies(std::string* ErrMsg) {
-  if (setjmp(context))
+  if (setjmp(context)) {
+    // Set caller's error message, if requested
+    if (ErrMsg)
+      *ErrMsg = ErrorMsg;
+    // Indicate an error occurred
     return true;
+  }
 
   LazyFunctionMap::iterator Fi = LazyFunctionLoadMap.begin();
   LazyFunctionMap::iterator Fe = LazyFunctionLoadMap.end();
diff --git a/llvm/lib/Bytecode/Reader/ReaderWrappers.cpp b/llvm/lib/Bytecode/Reader/ReaderWrappers.cpp
index d45a0f79bf38..a69f297ff092 100644
--- a/llvm/lib/Bytecode/Reader/ReaderWrappers.cpp
+++ b/llvm/lib/Bytecode/Reader/ReaderWrappers.cpp
@@ -309,7 +309,7 @@ Module *llvm::ParseBytecodeBuffer(const unsigned char *Buffer, unsigned Length,
   ModuleProvider *MP = 
     getBytecodeBufferModuleProvider(Buffer, Length, ModuleID, ErrMsg, 0);
   if (!MP) return 0;
-  Module *M = MP->releaseModule();
+  Module *M = MP->releaseModule(ErrMsg);
   delete MP;
   return M;
 }
@@ -341,7 +341,7 @@ Module *llvm::ParseBytecodeFile(const std::string &Filename,
                                 std::string *ErrMsg) {
   ModuleProvider* MP = getBytecodeModuleProvider(Filename, ErrMsg);
   if (!MP) return 0;
-  Module *M = MP->releaseModule();
+  Module *M = MP->releaseModule(ErrMsg);
   delete MP;
   return M;
 }
@@ -356,7 +356,7 @@ Module* llvm::AnalyzeBytecodeFile(
   BytecodeHandler* AH = createBytecodeAnalyzerHandler(bca,output);
   ModuleProvider* MP = getBytecodeModuleProvider(Filename, ErrMsg, AH);
   if (!MP) return 0;
-  Module *M = MP->releaseModule();
+  Module *M = MP->releaseModule(ErrMsg);
   delete MP;
   return M;
 }
@@ -375,7 +375,7 @@ Module* llvm::AnalyzeBytecodeBuffer(
   ModuleProvider* MP = 
     getBytecodeBufferModuleProvider(Buffer, Length, ModuleID, ErrMsg, hdlr);
   if (!MP) return 0;
-  Module *M = MP->releaseModule();
+  Module *M = MP->releaseModule(ErrMsg);
   delete MP;
   return M;
 }
@@ -388,7 +388,7 @@ bool llvm::GetBytecodeDependentLibraries(const std::string &fname,
     deplibs.clear();
     return true;
   }
-  Module* M = MP->releaseModule();
+  Module* M = MP->releaseModule(ErrMsg);
   deplibs = M->getLibraries();
   delete M;
   delete MP;