[ORC] Add ExecutorAddrRange::fromPtrRange convenience method.

This can be used to construct an ExecutorAddrRange from a pair of pointers, or
a pointer and a size.

This will be used to reduce boilerplate in an upcoming patch.

Author: lhames

llvm/include/llvm/ExecutionEngine/Orc/Shared/ExecutorAddress.h

@@ -226,6 +226,19 @@ struct ExecutorAddrRange {
   ExecutorAddrRange(ExecutorAddr Start, ExecutorAddrDiff Size)
       : Start(Start), End(Start + Size) {}
 
+  template <typename T, typename UnwrapFn = ExecutorAddr::defaultUnwrap<T>>
+  static ExecutorAddrRange fromPtrRange(T *Start, T *End,
+                                        UnwrapFn &&Unwrap = UnwrapFn()) {
+    return {ExecutorAddr::fromPtr(Start, Unwrap),
+            ExecutorAddr::fromPtr(End, Unwrap)};
+  }
+
+  template <typename T, typename UnwrapFn = ExecutorAddr::defaultUnwrap<T>>
+  static ExecutorAddrRange fromPtrRange(T *Ptr, ExecutorAddrDiff Size,
+                                        UnwrapFn &&Unwrap = UnwrapFn()) {
+    return {ExecutorAddr::fromPtr(Ptr, std::forward<UnwrapFn>(Unwrap)), Size};
+  }
+
   bool empty() const { return Start == End; }
   ExecutorAddrDiff size() const { return End - Start; }
 

llvm/unittests/ExecutionEngine/Orc/ExecutorAddressTest.cpp

@@ -106,6 +106,16 @@ TEST(ExecutorAddrTest, AddrRanges) {
   EXPECT_LT(R0, R1);
   EXPECT_GE(R0, R0);
   EXPECT_GT(R1, R0);
+
+  // Check fromPtr support.
+  char A[10];
+  auto RP1 = ExecutorAddrRange::fromPtrRange(A, A + 10);
+  EXPECT_EQ(RP1.Start.toPtr<char *>(), A);
+  EXPECT_EQ(RP1.End.toPtr<char *>(), A + 10);
+
+  auto RP2 = ExecutorAddrRange::fromPtrRange(A, 10);
+  EXPECT_EQ(RP2.Start.toPtr<char *>(), A);
+  EXPECT_EQ(RP2.End.toPtr<char *>(), A + 10);
 }
 
 TEST(ExecutorSymbolDef, PointerConversion) {