added builder function for extract_value and minor fixes

Author: HeroesGrave

Cargo.lock

@@ -1,14 +1,14 @@
 use ffi::core;
 use ffi::prelude::LLVMBasicBlockRef;
-use value::Value;
+use value::Function;
 use util;
 
 /// A container of instructions that execute sequentially.
 pub struct BasicBlock;
 native_ref!(&BasicBlock = LLVMBasicBlockRef);
 impl BasicBlock {
     /// Return the enclosing method, or `None` if it is not attached to a method.
-    pub fn get_parent(&self) -> Option<&Value> {
+    pub fn get_parent(&self) -> Option<&Function> {
         unsafe { util::ptr_to_null(core::LLVMGetBasicBlockParent(self.into())) }
     }
     /// Move this basic block after the `other` basic block in its function.

src/block.rs

@@ -118,6 +118,10 @@ impl Builder {
     pub fn build_insert_value(&self, agg: &Value, elem: &Value, index: usize) -> &Value {
         unsafe { core::LLVMBuildInsertValue(self.into(), agg.into(), elem.into(), index as c_uint, NULL_NAME.as_ptr()).into() }
     }
+    /// Build an instruction that extracts a value from an aggregate data value.
+    pub fn build_extract_value(&self, agg: &Value, index: usize) -> &Value {
+        unsafe { core::LLVMBuildExtractValue(self.into(), agg.into(), index as c_uint, NULL_NAME.as_ptr()).into() }
+    }
     /// Build an instruction that computes the address of a subelement of an aggregate data structure.
     ///
     /// Basically type-safe pointer arithmetic.

src/builder.rs

@@ -33,5 +33,5 @@ pub use module::{AddressSpace, Module, Functions};
 pub use object::{ObjectFile, Symbol, Symbols};
 pub use target::{TargetData, Target};
 pub use ty::{FunctionType, StructType, Type};
-pub use value::{Arg, Attribute, Value, Function, GlobalValue, GlobalVariable, Linkage, Predicate};
+pub use value::{Alias, Arg, Attribute, Value, Function, GlobalValue, GlobalVariable, Linkage, Predicate};
 pub use util::CastFrom;