Kaleidoscope-ch2: Remove the dependence on LLVM by cloning make_unique into this project

llvm-svn: 251936

llvm/examples/Kaleidoscope/Chapter2/toy.cpp

@@ -1,10 +1,22 @@
-#include "llvm/ADT/STLExtras.h"
 #include <cctype>
 #include <cstdio>
 #include <map>
+#include <memory>
 #include <string>
 #include <vector>
 
+namespace helper {
+// Cloning make_unique here until it's standard in C++14.
+// Using a namespace to avoid conflicting with MSVC's std::make_unique (which
+// ADL can sometimes find in unqualified calls).
+template <class T, class... Args>
+static
+    typename std::enable_if<!std::is_array<T>::value, std::unique_ptr<T>>::type
+    make_unique(Args &&... args) {
+  return std::unique_ptr<T>(new T(std::forward<Args>(args)...));
+}
+}
+
 //===----------------------------------------------------------------------===//
 // Lexer
 //===----------------------------------------------------------------------===//
@@ -189,7 +201,7 @@ static std::unique_ptr<ExprAST> ParseExpression();
 
 /// numberexpr ::= number
 static std::unique_ptr<ExprAST> ParseNumberExpr() {
-  auto Result = llvm::make_unique<NumberExprAST>(NumVal);
+  auto Result = helper::make_unique<NumberExprAST>(NumVal);
   getNextToken(); // consume the number
   return std::move(Result);
 }
@@ -216,7 +228,7 @@ static std::unique_ptr<ExprAST> ParseIdentifierExpr() {
   getNextToken(); // eat identifier.
 
   if (CurTok != '(') // Simple variable ref.
-    return llvm::make_unique<VariableExprAST>(IdName);
+    return helper::make_unique<VariableExprAST>(IdName);
 
   // Call.
   getNextToken(); // eat (
@@ -240,7 +252,7 @@ static std::unique_ptr<ExprAST> ParseIdentifierExpr() {
   // Eat the ')'.
   getNextToken();
 
-  return llvm::make_unique<CallExprAST>(IdName, std::move(Args));
+  return helper::make_unique<CallExprAST>(IdName, std::move(Args));
 }
 
 /// primary
@@ -292,8 +304,8 @@ static std::unique_ptr<ExprAST> ParseBinOpRHS(int ExprPrec,
     }
 
     // Merge LHS/RHS.
-    LHS =
-        llvm::make_unique<BinaryExprAST>(BinOp, std::move(LHS), std::move(RHS));
+    LHS = helper::make_unique<BinaryExprAST>(BinOp, std::move(LHS),
+                                             std::move(RHS));
   }
 }
 
@@ -329,7 +341,7 @@ static std::unique_ptr<PrototypeAST> ParsePrototype() {
   // success.
   getNextToken(); // eat ')'.
 
-  return llvm::make_unique<PrototypeAST>(FnName, std::move(ArgNames));
+  return helper::make_unique<PrototypeAST>(FnName, std::move(ArgNames));
 }
 
 /// definition ::= 'def' prototype expression
@@ -340,7 +352,7 @@ static std::unique_ptr<FunctionAST> ParseDefinition() {
     return nullptr;
 
   if (auto E = ParseExpression())
-    return llvm::make_unique<FunctionAST>(std::move(Proto), std::move(E));
+    return helper::make_unique<FunctionAST>(std::move(Proto), std::move(E));
   return nullptr;
 }
 
@@ -348,9 +360,9 @@ static std::unique_ptr<FunctionAST> ParseDefinition() {
 static std::unique_ptr<FunctionAST> ParseTopLevelExpr() {
   if (auto E = ParseExpression()) {
     // Make an anonymous proto.
-    auto Proto = llvm::make_unique<PrototypeAST>("__anon_expr",
-                                                 std::vector<std::string>());
-    return llvm::make_unique<FunctionAST>(std::move(Proto), std::move(E));
+    auto Proto = helper::make_unique<PrototypeAST>("__anon_expr",
+                                                   std::vector<std::string>());
+    return helper::make_unique<FunctionAST>(std::move(Proto), std::move(E));
   }
   return nullptr;
 }