Implement the ExecutionEngine::getPointerToFunctionOrStub by forwarding the

request on to the TargetMachine if it supports the getJITStubForFunction method

llvm-svn: 10431

Author: lattner

llvm/lib/ExecutionEngine/JIT/VM.cpp

@@ -77,6 +77,23 @@ void *VM::getPointerToFunction(Function *F) {
   return Addr;
 }
 
+// getPointerToFunctionOrStub - If the specified function has been
+// code-gen'd, return a pointer to the function.  If not, compile it, or use
+// a stub to implement lazy compilation if available.
+//
+void *VM::getPointerToFunctionOrStub(Function *F) {
+  // If we have already code generated the function, just return the address.
+  std::map<const GlobalValue*, void *>::iterator I = GlobalAddress.find(F);
+  if (I != GlobalAddress.end()) return I->second;
+
+  // If the target supports "stubs" for functions, get a stub now.
+  if (void *Ptr = TM.getJITStubForFunction(F, *MCE))
+    return Ptr;
+
+  // Otherwise, if the target doesn't support it, just codegen the function.
+  return getPointerToFunction(F);
+}
+
 /// recompileAndRelinkFunction - This method is used to force a function
 /// which has already been compiled, to be compiled again, possibly
 /// after it has been modified. Then the entry to the old copy is overwritten

llvm/lib/ExecutionEngine/JIT/VM.h

@@ -66,6 +66,12 @@ class VM : public ExecutionEngine {
   ///
   void *getPointerToFunction(Function *F);
 
+  /// getPointerToFunctionOrStub - If the specified function has been
+  /// code-gen'd, return a pointer to the function.  If not, compile it, or use
+  /// a stub to implement lazy compilation if available.
+  ///
+  void *getPointerToFunctionOrStub(Function *F);
+
   /// recompileAndRelinkFunction - This method is used to force a function
   /// which has already been compiled, to be compiled again, possibly
   /// after it has been modified. Then the entry to the old copy is overwritten