From b1208609ee4d18b2c0adaf860b72d0b2d5fd43d4 Mon Sep 17 00:00:00 2001
From: Nick Lewycky <nicholas@mxc.ca>
Date: Tue, 15 Sep 2009 06:28:26 +0000
Subject: [PATCH] Forbid arrays of function-type and structures with
 function-typed fields.

While I'm there, change code that does:
  SomeTy == Type::getFooType(Context)
into:
  SomeTy->getTypeID() == FooTyID
to decrease the amount of useless type creation which may involve locking, etc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81846 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/VMCore/Type.cpp                        | 30 +++++++++++++-----------------
 test/Other/2009-09-14-function-elements.ll |  6 ++++++
 2 files changed, 19 insertions(+), 17 deletions(-)
 create mode 100644 test/Other/2009-09-14-function-elements.ll

diff --git a/lib/VMCore/Type.cpp b/lib/VMCore/Type.cpp
index 19c91c5f03..2ddb8c7d5a 100644
--- a/lib/VMCore/Type.cpp
+++ b/lib/VMCore/Type.cpp
@@ -364,11 +364,10 @@ const IntegerType *Type::getInt64Ty(LLVMContext &C) {
 bool FunctionType::isValidReturnType(const Type *RetTy) {
   if (RetTy->isFirstClassType()) {
     if (const PointerType *PTy = dyn_cast<PointerType>(RetTy))
-      return PTy->getElementType() != Type::getMetadataTy(RetTy->getContext());
+      return PTy->getElementType()->getTypeID() != MetadataTyID;
     return true;
   }
-  if (RetTy == Type::getVoidTy(RetTy->getContext()) ||
-      RetTy == Type::getMetadataTy(RetTy->getContext()) ||
+  if (RetTy->getTypeID() == VoidTyID || RetTy->getTypeID() == MetadataTyID ||
       isa<OpaqueType>(RetTy))
     return true;
   
@@ -389,8 +388,7 @@ bool FunctionType::isValidReturnType(const Type *RetTy) {
 bool FunctionType::isValidArgumentType(const Type *ArgTy) {
   if ((!ArgTy->isFirstClassType() && !isa<OpaqueType>(ArgTy)) ||
       (isa<PointerType>(ArgTy) &&
-       cast<PointerType>(ArgTy)->getElementType() == 
-            Type::getMetadataTy(ArgTy->getContext())))
+       cast<PointerType>(ArgTy)->getElementType()->getTypeID() == MetadataTyID))
     return false;
 
   return true;
@@ -829,13 +827,12 @@ ArrayType *ArrayType::get(const Type *ElementType, uint64_t NumElements) {
 }
 
 bool ArrayType::isValidElementType(const Type *ElemTy) {
-  if (ElemTy == Type::getVoidTy(ElemTy->getContext()) ||
-      ElemTy == Type::getLabelTy(ElemTy->getContext()) ||
-      ElemTy == Type::getMetadataTy(ElemTy->getContext()))
+  if (ElemTy->getTypeID() == VoidTyID || ElemTy->getTypeID() == LabelTyID ||
+      ElemTy->getTypeID() == MetadataTyID || isa<FunctionType>(ElemTy))
     return false;
 
   if (const PointerType *PTy = dyn_cast<PointerType>(ElemTy))
-    if (PTy->getElementType() == Type::getMetadataTy(ElemTy->getContext()))
+    if (PTy->getElementType()->getTypeID() == MetadataTyID)
       return false;
 
   return true;
@@ -909,13 +906,12 @@ StructType *StructType::get(LLVMContext &Context, const Type *type, ...) {
 }
 
 bool StructType::isValidElementType(const Type *ElemTy) {
-  if (ElemTy == Type::getVoidTy(ElemTy->getContext()) ||
-      ElemTy == Type::getLabelTy(ElemTy->getContext()) ||
-      ElemTy == Type::getMetadataTy(ElemTy->getContext()))
+  if (ElemTy->getTypeID() == VoidTyID || ElemTy->getTypeID() == LabelTyID ||
+      ElemTy->getTypeID() == MetadataTyID || isa<FunctionType>(ElemTy))
     return false;
 
   if (const PointerType *PTy = dyn_cast<PointerType>(ElemTy))
-    if (PTy->getElementType() == Type::getMetadataTy(ElemTy->getContext()))
+    if (PTy->getElementType()->getTypeID() == MetadataTyID)
       return false;
 
   return true;
@@ -928,7 +924,7 @@ bool StructType::isValidElementType(const Type *ElemTy) {
 
 PointerType *PointerType::get(const Type *ValueType, unsigned AddressSpace) {
   assert(ValueType && "Can't get a pointer to <null> type!");
-  assert(ValueType != Type::getVoidTy(ValueType->getContext()) &&
+  assert(ValueType->getTypeID() != VoidTyID &&
          "Pointer to void is not valid, use i8* instead!");
   assert(isValidElementType(ValueType) && "Invalid type for pointer element!");
   PointerValType PVT(ValueType, AddressSpace);
@@ -955,12 +951,12 @@ PointerType *Type::getPointerTo(unsigned addrs) const {
 }
 
 bool PointerType::isValidElementType(const Type *ElemTy) {
-  if (ElemTy == Type::getVoidTy(ElemTy->getContext()) ||
-      ElemTy == Type::getLabelTy(ElemTy->getContext()))
+  if (ElemTy->getTypeID() == VoidTyID ||
+      ElemTy->getTypeID() == LabelTyID)
     return false;
 
   if (const PointerType *PTy = dyn_cast<PointerType>(ElemTy))
-    if (PTy->getElementType() == Type::getMetadataTy(ElemTy->getContext()))
+    if (PTy->getElementType()->getTypeID() == MetadataTyID)
       return false;
 
   return true;
diff --git a/test/Other/2009-09-14-function-elements.ll b/test/Other/2009-09-14-function-elements.ll
new file mode 100644
index 0000000000..883d76d107
--- /dev/null
+++ b/test/Other/2009-09-14-function-elements.ll
@@ -0,0 +1,6 @@
+; RUN: not llvm-as %s -disable-output 2>/dev/null
+
+; Arrays and structures with function types (not function pointers) are illegal.
+
+@foo = external global [4 x i32 (i32)]
+@bar = external global { i32 (i32) }
-- 
2.11.4.GIT