vendor/lldb/lldb-trunk-r303197

1 files changed, 275 insertions, 0 deletions

diff --git a/source/Utility/Status.cpp b/source/Utility/Status.cpp
new file mode 100644
index 000000000000..5996be1e4e05
--- /dev/null
+++ b/source/Utility/Status.cpp
@@ -0,0 +1,275 @@
+//===-- Status.cpp -----------------------------------------------*- C++
+//-*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "lldb/Utility/Status.h"
+
+#include "lldb/Utility/VASPrintf.h"
+#include "lldb/lldb-defines.h"            // for LLDB_GENERIC_ERROR
+#include "lldb/lldb-enumerations.h"       // for ErrorType, ErrorType::eErr...
+#include "llvm/ADT/SmallString.h"         // for SmallString
+#include "llvm/ADT/StringRef.h"           // for StringRef
+#include "llvm/Support/FormatProviders.h" // for format_provider
+
+#include <cerrno>
+#include <cstdarg>
+#include <string> // for string
+#include <system_error>
+
+#ifdef __APPLE__
+#include <mach/mach.h>
+#endif
+
+#include <stdint.h> // for uint32_t
+#include <string.h> // for strerror
+
+namespace llvm {
+class raw_ostream;
+}
+
+using namespace lldb;
+using namespace lldb_private;
+
+Status::Status() : m_code(0), m_type(eErrorTypeInvalid), m_string() {}
+
+Status::Status(ValueType err, ErrorType type)
+    : m_code(err), m_type(type), m_string() {}
+
+Status::Status(std::error_code EC)
+    : m_code(EC.value()), m_type(ErrorType::eErrorTypeGeneric),
+      m_string(EC.message()) {}
+
+Status::Status(const Status &rhs) = default;
+
+Status::Status(const char *format, ...)
+    : m_code(0), m_type(eErrorTypeInvalid), m_string() {
+  va_list args;
+  va_start(args, format);
+  SetErrorToGenericError();
+  SetErrorStringWithVarArg(format, args);
+  va_end(args);
+}
+
+//----------------------------------------------------------------------
+// Assignment operator
+//----------------------------------------------------------------------
+const Status &Status::operator=(const Status &rhs) {
+  if (this != &rhs) {
+    m_code = rhs.m_code;
+    m_type = rhs.m_type;
+    m_string = rhs.m_string;
+  }
+  return *this;
+}
+
+//----------------------------------------------------------------------
+// Assignment operator
+//----------------------------------------------------------------------
+const Status &Status::operator=(uint32_t err) {
+  m_code = err;
+  m_type = eErrorTypeMachKernel;
+  m_string.clear();
+  return *this;
+}
+
+Status::~Status() = default;
+
+//----------------------------------------------------------------------
+// Get the error value as a NULL C string. The error string will be
+// fetched and cached on demand. The cached error string value will
+// remain until the error value is changed or cleared.
+//----------------------------------------------------------------------
+const char *Status::AsCString(const char *default_error_str) const {
+  if (Success())
+    return nullptr;
+
+  if (m_string.empty()) {
+    const char *s = nullptr;
+    switch (m_type) {
+    case eErrorTypeMachKernel:
+#if defined(__APPLE__)
+      s = ::mach_error_string(m_code);
+#endif
+      break;
+
+    case eErrorTypePOSIX:
+      s = ::strerror(m_code);
+      break;
+
+    default:
+      break;
+    }
+    if (s != nullptr)
+      m_string.assign(s);
+  }
+  if (m_string.empty()) {
+    if (default_error_str)
+      m_string.assign(default_error_str);
+    else
+      return nullptr; // User wanted a nullptr string back...
+  }
+  return m_string.c_str();
+}
+
+//----------------------------------------------------------------------
+// Clear the error and any cached error string that it might contain.
+//----------------------------------------------------------------------
+void Status::Clear() {
+  m_code = 0;
+  m_type = eErrorTypeInvalid;
+  m_string.clear();
+}
+
+//----------------------------------------------------------------------
+// Access the error value.
+//----------------------------------------------------------------------
+Status::ValueType Status::GetError() const { return m_code; }
+
+//----------------------------------------------------------------------
+// Access the error type.
+//----------------------------------------------------------------------
+ErrorType Status::GetType() const { return m_type; }
+
+//----------------------------------------------------------------------
+// Returns true if this object contains a value that describes an
+// error or otherwise non-success result.
+//----------------------------------------------------------------------
+bool Status::Fail() const { return m_code != 0; }
+
+//----------------------------------------------------------------------
+// Set accesssor for the error value to "err" and the type to
+// "eErrorTypeMachKernel"
+//----------------------------------------------------------------------
+void Status::SetMachError(uint32_t err) {
+  m_code = err;
+  m_type = eErrorTypeMachKernel;
+  m_string.clear();
+}
+
+void Status::SetExpressionError(lldb::ExpressionResults result,
+                                const char *mssg) {
+  m_code = result;
+  m_type = eErrorTypeExpression;
+  m_string = mssg;
+}
+
+int Status::SetExpressionErrorWithFormat(lldb::ExpressionResults result,
+                                         const char *format, ...) {
+  int length = 0;
+
+  if (format != nullptr && format[0]) {
+    va_list args;
+    va_start(args, format);
+    length = SetErrorStringWithVarArg(format, args);
+    va_end(args);
+  } else {
+    m_string.clear();
+  }
+  m_code = result;
+  m_type = eErrorTypeExpression;
+  return length;
+}
+
+//----------------------------------------------------------------------
+// Set accesssor for the error value and type.
+//----------------------------------------------------------------------
+void Status::SetError(ValueType err, ErrorType type) {
+  m_code = err;
+  m_type = type;
+  m_string.clear();
+}
+
+//----------------------------------------------------------------------
+// Update the error value to be "errno" and update the type to
+// be "POSIX".
+//----------------------------------------------------------------------
+void Status::SetErrorToErrno() {
+  m_code = errno;
+  m_type = eErrorTypePOSIX;
+  m_string.clear();
+}
+
+//----------------------------------------------------------------------
+// Update the error value to be LLDB_GENERIC_ERROR and update the type
+// to be "Generic".
+//----------------------------------------------------------------------
+void Status::SetErrorToGenericError() {
+  m_code = LLDB_GENERIC_ERROR;
+  m_type = eErrorTypeGeneric;
+  m_string.clear();
+}
+
+//----------------------------------------------------------------------
+// Set accessor for the error string value for a specific error.
+// This allows any string to be supplied as an error explanation.
+// The error string value will remain until the error value is
+// cleared or a new error value/type is assigned.
+//----------------------------------------------------------------------
+void Status::SetErrorString(llvm::StringRef err_str) {
+  if (!err_str.empty()) {
+    // If we have an error string, we should always at least have an error
+    // set to a generic value.
+    if (Success())
+      SetErrorToGenericError();
+  }
+  m_string = err_str;
+}
+
+//------------------------------------------------------------------
+/// Set the current error string to a formatted error string.
+///
+/// @param format
+///     A printf style format string
+//------------------------------------------------------------------
+int Status::SetErrorStringWithFormat(const char *format, ...) {
+  if (format != nullptr && format[0]) {
+    va_list args;
+    va_start(args, format);
+    int length = SetErrorStringWithVarArg(format, args);
+    va_end(args);
+    return length;
+  } else {
+    m_string.clear();
+  }
+  return 0;
+}
+
+int Status::SetErrorStringWithVarArg(const char *format, va_list args) {
+  if (format != nullptr && format[0]) {
+    // If we have an error string, we should always at least have
+    // an error set to a generic value.
+    if (Success())
+      SetErrorToGenericError();
+
+    llvm::SmallString<1024> buf;
+    VASprintf(buf, format, args);
+    m_string = buf.str();
+    return buf.size();
+  } else {
+    m_string.clear();
+  }
+  return 0;
+}
+
+//----------------------------------------------------------------------
+// Returns true if the error code in this object is considered a
+// successful return value.
+//----------------------------------------------------------------------
+bool Status::Success() const { return m_code == 0; }
+
+bool Status::WasInterrupted() const {
+  return (m_type == eErrorTypePOSIX && m_code == EINTR);
+}
+
+void llvm::format_provider<lldb_private::Status>::format(
+    const lldb_private::Status &error, llvm::raw_ostream &OS,
+    llvm::StringRef Options) {
+  llvm::format_provider<llvm::StringRef>::format(error.AsCString(), OS,
+                                                 Options);
+}