From 9ca6cdaee91fddcd3ea57dedcd624c14c7a40f65 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Wed, 8 Mar 2006 18:42:46 +0000 Subject: Add a helper method for running static ctors/dtors in the module. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26619 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/ExecutionEngine/ExecutionEngine.cpp | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) (limited to 'lib/ExecutionEngine/ExecutionEngine.cpp') diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp index 95610e65b6..86af7bfafe 100644 --- a/lib/ExecutionEngine/ExecutionEngine.cpp +++ b/lib/ExecutionEngine/ExecutionEngine.cpp @@ -95,6 +95,37 @@ static void *CreateArgv(ExecutionEngine *EE, return Result; } + +/// runStaticConstructorsDestructors - This method is used to execute all of +/// the static constructors or destructors for a module, depending on the +/// value of isDtors. +void ExecutionEngine::runStaticConstructorsDestructors(bool isDtors) { + const char *Name = isDtors ? "llvm.global_dtors" : "llvm.global_ctors"; + GlobalVariable *GV = CurMod.getNamedGlobal(Name); + if (!GV || GV->isExternal() || !GV->hasInternalLinkage()) return; + + // Should be an array of '{ int, void ()* }' structs. The first value is the + // init priority, which we ignore. + ConstantArray *InitList = dyn_cast(GV->getInitializer()); + if (!InitList) return; + for (unsigned i = 0, e = InitList->getNumOperands(); i != e; ++i) + if (ConstantStruct *CS = dyn_cast(InitList->getOperand(i))){ + if (CS->getNumOperands() != 2) return; // Not array of 2-element structs. + + Constant *FP = CS->getOperand(1); + if (FP->isNullValue()) + return; // Found a null terminator, exit. + + if (ConstantExpr *CE = dyn_cast(FP)) + if (CE->getOpcode() == Instruction::Cast) + FP = CE->getOperand(0); + if (Function *F = dyn_cast(FP)) { + // Execute the ctor/dtor function! + runFunction(F, std::vector()); + } + } +} + /// runFunctionAsMain - This is a helper function which wraps runFunction to /// handle the common task of starting up main with the specified argc, argv, /// and envp parameters. @@ -122,8 +153,6 @@ int ExecutionEngine::runFunctionAsMain(Function *Fn, return runFunction(Fn, GVArgs).IntVal; } - - /// If possible, create a JIT, unless the caller specifically requests an /// Interpreter or there's an error. If even an Interpreter cannot be created, /// NULL is returned. -- cgit v1.2.3-18-g5258