Add a pointersize/endianness safe load routine to match the store routine
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6042 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/ExecutionEngine/ExecutionEngine.cpp b/lib/ExecutionEngine/ExecutionEngine.cpp
index dcfbde4..a3c3f47 100644
--- a/lib/ExecutionEngine/ExecutionEngine.cpp
+++ b/lib/ExecutionEngine/ExecutionEngine.cpp
@@ -152,6 +152,82 @@
}
}
+GenericValue ExecutionEngine::LoadValueFromMemory(GenericValue *Ptr,
+ const Type *Ty) {
+ GenericValue Result;
+ if (getTargetData().isLittleEndian()) {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[0] |
+ ((unsigned)Ptr->Untyped[1] << 8);
+ break;
+ Load4BytesLittleEndian:
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[0] |
+ ((unsigned)Ptr->Untyped[1] << 8) |
+ ((unsigned)Ptr->Untyped[2] << 16) |
+ ((unsigned)Ptr->Untyped[3] << 24);
+ break;
+ case Type::PointerTyID: if (getModule().has32BitPointers())
+ goto Load4BytesLittleEndian;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[0] |
+ ((uint64_t)Ptr->Untyped[1] << 8) |
+ ((uint64_t)Ptr->Untyped[2] << 16) |
+ ((uint64_t)Ptr->Untyped[3] << 24) |
+ ((uint64_t)Ptr->Untyped[4] << 32) |
+ ((uint64_t)Ptr->Untyped[5] << 40) |
+ ((uint64_t)Ptr->Untyped[6] << 48) |
+ ((uint64_t)Ptr->Untyped[7] << 56);
+ break;
+ default:
+ std::cout << "Cannot load value of type " << *Ty << "!\n";
+ abort();
+ }
+ } else {
+ switch (Ty->getPrimitiveID()) {
+ case Type::BoolTyID:
+ case Type::UByteTyID:
+ case Type::SByteTyID: Result.UByteVal = Ptr->Untyped[0]; break;
+ case Type::UShortTyID:
+ case Type::ShortTyID: Result.UShortVal = (unsigned)Ptr->Untyped[1] |
+ ((unsigned)Ptr->Untyped[0] << 8);
+ break;
+ Load4BytesBigEndian:
+ case Type::FloatTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID: Result.UIntVal = (unsigned)Ptr->Untyped[3] |
+ ((unsigned)Ptr->Untyped[2] << 8) |
+ ((unsigned)Ptr->Untyped[1] << 16) |
+ ((unsigned)Ptr->Untyped[0] << 24);
+ break;
+ case Type::PointerTyID: if (getModule().has32BitPointers())
+ goto Load4BytesBigEndian;
+ case Type::DoubleTyID:
+ case Type::ULongTyID:
+ case Type::LongTyID: Result.ULongVal = (uint64_t)Ptr->Untyped[7] |
+ ((uint64_t)Ptr->Untyped[6] << 8) |
+ ((uint64_t)Ptr->Untyped[5] << 16) |
+ ((uint64_t)Ptr->Untyped[4] << 24) |
+ ((uint64_t)Ptr->Untyped[3] << 32) |
+ ((uint64_t)Ptr->Untyped[2] << 40) |
+ ((uint64_t)Ptr->Untyped[1] << 48) |
+ ((uint64_t)Ptr->Untyped[0] << 56);
+ break;
+ default:
+ std::cout << "Cannot load value of type " << *Ty << "!\n";
+ abort();
+ }
+ }
+ return Result;
+}
+
+
// InitializeMemory - Recursive function to apply a Constant value into the
// specified memory location...
//