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Added an extra parameter to the object-checker

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functions in the Objective-C language runtime
that is set to the selector that is being passed
to the object.

llvm-svn: 143083
This commit is contained in:
Sean Callanan
2011-10-27 00:02:05 +00:00
parent 3249a1e862
commit 7ba9636f0a
3 changed files with 53 additions and 25 deletions
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40
lldb/source/Expression/IRDynamicChecks.cpp
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@@ -275,6 +275,34 @@ protected:
return ConstantExpr::getIntToPtr(fun_addr_int, fun_ptr_ty);
}
//------------------------------------------------------------------
/// Build a function pointer for a function with signature
/// void (*)(uint8_t*, uint8_t*) with a given address
///
/// @param[in] start_address
/// The address of the function.
///
/// @return
/// The function pointer, for use in a CallInst.
//------------------------------------------------------------------
llvm::Value *BuildObjectCheckerFunc(lldb::addr_t start_address)
{
IntegerType *intptr_ty = llvm::Type::getIntNTy(m_module.getContext(),
(m_module.getPointerSize() == llvm::Module::Pointer64) ? 64 : 32);
llvm::Type *param_array[2];
param_array[0] = const_cast<llvm::PointerType*>(GetI8PtrTy());
param_array[1] = const_cast<llvm::PointerType*>(GetI8PtrTy());
ArrayRef<llvm::Type*> params(param_array, 2);
FunctionType *fun_ty = FunctionType::get(llvm::Type::getVoidTy(m_module.getContext()), params, true);
PointerType *fun_ptr_ty = PointerType::getUnqual(fun_ty);
Constant *fun_addr_int = ConstantInt::get(intptr_ty, start_address, false);
return ConstantExpr::getIntToPtr(fun_addr_int, fun_ptr_ty);
}
PointerType *GetI8PtrTy()
{
if (!m_i8ptr_ty)
@@ -386,14 +414,13 @@ private:
return false; // call_inst really shouldn't be NULL, because otherwise InspectInstruction wouldn't have registered it
if (!m_objc_object_check_func)
m_objc_object_check_func = BuildPointerValidatorFunc(m_checker_functions.m_objc_object_check->StartAddress());
llvm::Value *target_object = NULL;
m_objc_object_check_func = BuildObjectCheckerFunc(m_checker_functions.m_objc_object_check->StartAddress());
// id objc_msgSend(id theReceiver, SEL theSelector, ...)
target_object = call_inst->getArgOperand(0);
llvm::Value *target_object = call_inst->getArgOperand(0);;
llvm::Value *selector = call_inst->getArgOperand(1);
// Insert an instruction to cast the receiver id to int8_t*
BitCastInst *bit_cast = new BitCastInst(target_object,
@@ -403,9 +430,10 @@ private:
// Insert an instruction to call the helper with the result
llvm::Value *arg_array[1];
llvm::Value *arg_array[2];
arg_array[0] = bit_cast;
arg_array[1] = selector;
ArrayRef<llvm::Value*> args(arg_array, 1);