Switch executable semantics to use ErrorBuilder directly and relocate macros (#1184)

executable_semantics/common/source_location.h

@@ -0,0 +1,45 @@
+// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
+// Exceptions. See /LICENSE for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+
+#ifndef EXECUTABLE_SEMANTICS_COMMON_SOURCE_LOCATION_H_
+#define EXECUTABLE_SEMANTICS_COMMON_SOURCE_LOCATION_H_
+
+#include <string>
+#include <string_view>
+
+#include "common/ostream.h"
+#include "executable_semantics/common/nonnull.h"
+
+namespace Carbon {
+
+class SourceLocation {
+ public:
+  // The filename should be eternal or arena-allocated to eliminate copies.
+  constexpr SourceLocation(const char* filename, int line_num)
+      : filename_(filename), line_num_(line_num) {}
+  SourceLocation(Nonnull<const std::string*> filename, int line_num)
+      : filename_(filename->c_str()), line_num_(line_num) {}
+
+  SourceLocation(const SourceLocation&) = default;
+  SourceLocation(SourceLocation&&) = default;
+  auto operator=(const SourceLocation&) -> SourceLocation& = default;
+  auto operator=(SourceLocation&&) -> SourceLocation& = default;
+
+  auto operator==(SourceLocation other) const -> bool {
+    return filename_ == other.filename_ && line_num_ == other.line_num_;
+  }
+
+  void Print(llvm::raw_ostream& out) const {
+    out << filename_ << ":" << line_num_;
+  }
+  LLVM_DUMP_METHOD void Dump() const { Print(llvm::errs()); }
+
+ private:
+  std::string_view filename_;
+  int line_num_;
+};
+
+}  // namespace Carbon
+
+#endif  // EXECUTABLE_SEMANTICS_COMMON_SOURCE_LOCATION_H_