add a mechanism for the JIT to invoke a function to lazily create functions as they are referenced.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@43210 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 7 insertions, 2 deletions

diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index 2129dd5..d89a9bb 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -33,13 +33,13 @@ STATISTIC(NumGlobals  , "Number of global vars initialized");
 ExecutionEngine::EECtorFn ExecutionEngine::JITCtor = 0;
 ExecutionEngine::EECtorFn ExecutionEngine::InterpCtor = 0;
 
-ExecutionEngine::ExecutionEngine(ModuleProvider *P) {
+ExecutionEngine::ExecutionEngine(ModuleProvider *P) : LazyFunctionCreator(0) {
   LazyCompilationDisabled = false;
   Modules.push_back(P);
   assert(P && "ModuleProvider is null?");
 }
 
-ExecutionEngine::ExecutionEngine(Module *M) {
+ExecutionEngine::ExecutionEngine(Module *M) : LazyFunctionCreator(0) {
   LazyCompilationDisabled = false;
   assert(M && "Module is null?");
   Modules.push_back(new ExistingModuleProvider(M));
diff --git a/lib/ExecutionEngine/JIT/Intercept.cpp b/lib/ExecutionEngine/JIT/Intercept.cpp
index 61035c2..318d606 100644
--- a/lib/ExecutionEngine/JIT/Intercept.cpp
+++ b/lib/ExecutionEngine/JIT/Intercept.cpp
@@ -101,6 +101,11 @@ void *JIT::getPointerToNamedFunction(const std::string &Name) {
     Ptr = sys::DynamicLibrary::SearchForAddressOfSymbol(NameStr+1);
     if (Ptr) return Ptr;
   }
+  
+  /// If a LazyFunctionCreator is installed, use it to get/create the function. 
+  if (LazyFunctionCreator)
+    if (void *RP = LazyFunctionCreator(Name))
+      return RP;
 
   cerr << "ERROR: Program used external function '" << Name
        << "' which could not be resolved!\n";