impl AnyValue & BasicValue for GlobalValue as they are always PointerValues.

Fixes rust-lang#26

Author: TheDan64

src/values/global_value.rs

@@ -6,10 +6,10 @@ use std::ffi::{CString, CStr};
 
 use {GlobalVisibility, ThreadLocalMode, DLLStorageClass};
 use values::traits::AsValueRef;
-use values::{BasicValueEnum, BasicValue, Value};
+use values::{BasicValueEnum, BasicValue, PointerValue, Value};
 
-// REVIEW: GlobalValues may always be PointerValues, in which case we can
-// simplify from BasicValueEnum down to PointerValue
+// REVIEW: GlobalValues are always PointerValues. With SubTypes, we should
+// compress this into a PointerValue<Global> type
 #[derive(Debug, PartialEq, Eq, Clone, Copy)]
 pub struct GlobalValue {
     global_value: Value,
@@ -189,6 +189,10 @@ impl GlobalValue {
     pub unsafe fn delete(self) {
         LLVMDeleteGlobal(self.as_value_ref())
     }
+
+    pub fn as_pointer_value(&self) -> PointerValue {
+        PointerValue::new(self.as_value_ref())
+    }
 }
 
 impl AsValueRef for GlobalValue {

src/values/traits.rs

@@ -2,7 +2,7 @@ use llvm_sys::prelude::LLVMValueRef;
 
 use std::fmt::Debug;
 
-use values::{ArrayValue, AggregateValueEnum, StructValue, BasicValueEnum, AnyValueEnum, IntValue, FloatValue, PointerValue, PhiValue, VectorValue, FunctionValue, InstructionValue};
+use values::{ArrayValue, AggregateValueEnum, GlobalValue, StructValue, BasicValueEnum, AnyValueEnum, IntValue, FloatValue, PointerValue, PhiValue, VectorValue, FunctionValue, InstructionValue};
 
 // This is an ugly privacy hack so that Type can stay private to this module
 // and so that super traits using this trait will be not be implementable
@@ -47,5 +47,5 @@ pub trait AnyValue: AsValueRef + Debug {
 }
 
 trait_value_set! {AggregateValue: ArrayValue, AggregateValueEnum, StructValue}
-trait_value_set! {AnyValue: AnyValueEnum, BasicValueEnum, AggregateValueEnum, ArrayValue, IntValue, FloatValue, PhiValue, PointerValue, FunctionValue, StructValue, VectorValue, InstructionValue}
-trait_value_set! {BasicValue: ArrayValue, BasicValueEnum, AggregateValueEnum, IntValue, FloatValue, StructValue, PointerValue, VectorValue}
+trait_value_set! {AnyValue: AnyValueEnum, BasicValueEnum, AggregateValueEnum, ArrayValue, IntValue, FloatValue, GlobalValue, PhiValue, PointerValue, FunctionValue, StructValue, VectorValue, InstructionValue}
+trait_value_set! {BasicValue: ArrayValue, BasicValueEnum, AggregateValueEnum, IntValue, FloatValue, GlobalValue, StructValue, PointerValue, VectorValue}

tests/test_values.rs

@@ -9,6 +9,8 @@ use self::inkwell::values::{MetadataValue, FIRST_CUSTOM_METADATA_KIND_ID};
 
 use std::ffi::CString;
 
+// TODO: Test GlobalValues used as PointerValues
+
 #[test]
 fn test_linkage() {
     let context = Context::create();