Added CompositeConstant

Author: mrLSD

llvm-api/LLVM/Core/Values/Constants/Composite.swift

@@ -0,0 +1,130 @@
+import CLLVM
+
+/// Functions in this group operate on composite constants.
+public enum CompositeConstant {
+    /// Create a ConstantDataSequential and initialize it with a string.
+    public static func constStringInContext(context: ContextRef, str: String, dontNullTerminate: Bool) -> Value {
+        let valueRef = str.withCString { cStr in
+            let length = UInt32(str.utf8.count)
+            return LLVMConstStringInContext(context.contextRef, cStr, length, dontNullTerminate.llvm)!
+        }
+        return Value(llvm: valueRef)
+    }
+
+    /// Create a ConstantDataSequential with string content in the global context.
+    /// This is the same as `constStringInContext` except it operates on the global context.
+    public static func constString(str: String, dontNullTerminate: Bool) -> Value {
+        let valueRef = str.withCString { cStr in
+            let length = UInt32(str.utf8.count)
+            return LLVMConstString(cStr, length, dontNullTerminate.llvm)!
+        }
+        return Value(llvm: valueRef)
+    }
+
+    /// Returns true if the specified constant is an array of i8.
+    public static func isConstantString(value: ValueRef) -> Bool {
+        LLVMIsConstantString(value.valueRef) != 0
+    }
+
+    /// Get the given constant data sequential as a string.
+    public static func getString(value: ValueRef) -> (String, UInt) {
+        var length: UInt = 0
+        let lengthPtr = UnsafeMutablePointer<UInt>.allocate(capacity: 1)
+        defer {
+            lengthPtr.deallocate()
+        }
+
+        if let cStr = LLVMGetAsString(value.valueRef, lengthPtr) {
+            length = lengthPtr.pointee
+            let swiftStr = String(cString: cStr)
+            return (swiftStr, length)
+        } else {
+            return ("", 0)
+        }
+    }
+
+    /// Create an anonymous `ConstantStruct` with the specified values.
+    public static func constStructInContext(context: ContextRef, constantVals: [ValueRef], packed: Bool) -> Value? {
+        let count = UInt32(constantVals.count)
+        let vals = UnsafeMutablePointer<LLVMValueRef?>.allocate(capacity: Int(count))
+        defer {
+            vals.deallocate()
+        }
+
+        for (index, val) in constantVals.enumerated() {
+            vals[index] = val.valueRef
+        }
+        guard let valueRef = LLVMConstStructInContext(context.contextRef, vals, count, packed.llvm) else { return nil }
+        return Value(llvm: valueRef)
+    }
+
+    /// Create a `ConstantStruct` in the global Context.
+    /// This is the same as `constStructInContext` except it operates on the global `Context`.
+    public static func createLLVMConstStruct(constantVals: [ValueRef], packed: Bool) -> Value? {
+        let count = UInt32(constantVals.count)
+        let vals = UnsafeMutablePointer<LLVMValueRef?>.allocate(capacity: Int(count))
+        defer {
+            vals.deallocate()
+        }
+
+        for (index, val) in constantVals.enumerated() {
+            vals[index] = val.valueRef
+        }
+        guard let valueRef = LLVMConstStruct(vals, count, packed.llvm) else { return nil }
+        return Value(llvm: valueRef)
+    }
+
+    /// Create a `ConstantArray` from values.
+    @available(*, deprecated, message: "ConstArray is deprecated in favor of the API accurate constArray2")
+    public static func createLLVMConstArray(elementType: TypeRef, constantValues: [ValueRef]) -> Value? {
+        let length = UInt32(constantValues.count)
+        let values = UnsafeMutablePointer<LLVMValueRef?>.allocate(capacity: Int(length))
+        defer {
+            values.deallocate()
+        }
+
+        for (index, value) in constantValues.enumerated() {
+            values[index] = value.valueRef
+        }
+        guard let valueRef = LLVMConstArray(elementType.typeRef, values, length) else { return nil }
+        return Value(llvm: valueRef)
+    }
+
+    /// Create a ConstantArray from values.
+    public static func constArray2(elementType: TypeRef, constantValues: [ValueRef]) -> Value? {
+        let length = UInt64(constantValues.count)
+        let values = UnsafeMutablePointer<LLVMValueRef?>.allocate(capacity: Int(length))
+        defer {
+            values.deallocate()
+        }
+
+        for (index, value) in constantValues.enumerated() {
+            values[index] = value.valueRef
+        }
+        guard let valueRef = LLVMConstArray2(elementType.typeRef, values, length) else { return nil }
+        return Value(llvm: valueRef)
+    }
+
+    /**
+     * Create a non-anonymous ConstantStruct from values.
+     */
+    // LLVMValueRef LLVMConstNamedStruct(LLVMTypeRef StructTy, LLVMValueRef *ConstantVals, unsigned Count);
+
+    /**
+     * Get element of a constant aggregate (struct, array or vector) at the
+     * specified index. Returns null if the index is out of range, or it's not
+     * possible to determine the element (e.g., because the constant is a
+     * constant expression.)
+     */
+    // LLVMValueRef LLVMGetAggregateElement(LLVMValueRef C, unsigned Idx);
+
+    /**
+     * Get an element at specified index as a constant.
+     */
+    // LLVM_ATTRIBUTE_C_DEPRECATED( LLVMValueRef LLVMGetElementAsConstant(LLVMValueRef C, unsigned idx), "Use LLVMGetAggregateElement instead");
+
+    /**
+     * Create a ConstantVector from values.
+     */
+    // LLVMValueRef LLVMConstVector(LLVMValueRef *ScalarConstantVals, unsigned Size);
+}