vendor/lld/lld-trunk-r233088

1 files changed, 151 insertions, 0 deletions

diff --git a/lib/Core/Error.cpp b/lib/Core/Error.cpp
new file mode 100644
index 000000000000..24809c3869e5
--- /dev/null
+++ b/lib/Core/Error.cpp
@@ -0,0 +1,151 @@
+//===- Error.cpp - system_error extensions for lld --------------*- C++ -*-===//
+//
+//                             The LLVM Linker
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lld/Core/Error.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/Support/ErrorHandling.h"
+#include <mutex>
+#include <string>
+#include <vector>
+
+using namespace lld;
+
+class _NativeReaderErrorCategory : public std::error_category {
+public:
+  const char* name() const LLVM_NOEXCEPT override {
+    return "lld.native.reader";
+  }
+
+  std::string message(int ev) const override {
+    switch (static_cast<NativeReaderError>(ev)) {
+    case NativeReaderError::success:
+      return "Success";
+    case NativeReaderError::unknown_file_format:
+      return "Unknown file format";
+    case NativeReaderError::file_too_short:
+      return "file truncated";
+    case NativeReaderError::file_malformed:
+      return "file malformed";
+    case NativeReaderError::memory_error:
+      return "out of memory";
+    case NativeReaderError::unknown_chunk_type:
+      return "unknown chunk type";
+    case NativeReaderError::conflicting_target_machine:
+      return "conflicting target machine";
+    }
+    llvm_unreachable("An enumerator of NativeReaderError does not have a "
+                     "message defined.");
+  }
+};
+
+const std::error_category &lld::native_reader_category() {
+  static _NativeReaderErrorCategory o;
+  return o;
+}
+
+class _YamlReaderErrorCategory : public std::error_category {
+public:
+  const char* name() const LLVM_NOEXCEPT override {
+    return "lld.yaml.reader";
+  }
+
+  std::string message(int ev) const override {
+    switch (static_cast<YamlReaderError>(ev)) {
+    case YamlReaderError::success:
+      return "Success";
+    case YamlReaderError::unknown_keyword:
+      return "Unknown keyword found in yaml file";
+    case YamlReaderError::illegal_value:
+      return "Bad value found in yaml file";
+    }
+    llvm_unreachable("An enumerator of YamlReaderError does not have a "
+                     "message defined.");
+  }
+};
+
+const std::error_category &lld::YamlReaderCategory() {
+  static _YamlReaderErrorCategory o;
+  return o;
+}
+
+class _LinkerScriptReaderErrorCategory : public std::error_category {
+public:
+  const char *name() const LLVM_NOEXCEPT override {
+    return "lld.linker-script.reader";
+  }
+
+  std::string message(int ev) const override {
+    switch (static_cast<LinkerScriptReaderError>(ev)) {
+    case LinkerScriptReaderError::success:
+      return "Success";
+    case LinkerScriptReaderError::parse_error:
+      return "Error parsing linker script";
+    case LinkerScriptReaderError::unknown_symbol_in_expr:
+      return "Unknown symbol found when evaluating linker script expression";
+    case LinkerScriptReaderError::unrecognized_function_in_expr:
+      return "Unrecognized function call when evaluating linker script "
+             "expression";
+    }
+    llvm_unreachable("An enumerator of LinkerScriptReaderError does not have a "
+                     "message defined.");
+  }
+};
+
+const std::error_category &lld::LinkerScriptReaderCategory() {
+  static _LinkerScriptReaderErrorCategory o;
+  return o;
+}
+
+
+namespace lld {
+
+/// Temporary class to enable make_dynamic_error_code() until
+/// llvm::ErrorOr<> is updated to work with error encapsulations
+/// other than error_code.
+class dynamic_error_category : public std::error_category {
+public:
+  ~dynamic_error_category() LLVM_NOEXCEPT {}
+
+  const char *name() const LLVM_NOEXCEPT override {
+    return "lld.dynamic_error";
+  }
+
+  std::string message(int ev) const override {
+    assert(ev >= 0);
+    assert(ev < (int)_messages.size());
+    // The value is an index into the string vector.
+    return _messages[ev];
+  }
+
+  int add(std::string msg) {
+    std::lock_guard<std::recursive_mutex> lock(_mutex);
+    // Value zero is always the successs value.
+    if (_messages.empty())
+      _messages.push_back("Success");
+    _messages.push_back(msg);
+    // Return the index of the string just appended.
+    return _messages.size() - 1;
+  }
+
+private:
+  std::vector<std::string> _messages;
+  std::recursive_mutex _mutex;
+};
+
+static dynamic_error_category categorySingleton;
+
+std::error_code make_dynamic_error_code(StringRef msg) {
+  return std::error_code(categorySingleton.add(msg), categorySingleton);
+}
+
+std::error_code make_dynamic_error_code(const Twine &msg) {
+  return std::error_code(categorySingleton.add(msg.str()), categorySingleton);
+}
+
+}