lldb/tools/lldb-mi/MICmnLLDBProxySBValue.cpp

//===-- MICmnLLDBProxySBValue.cpp -------------------------------*- C++ -*-===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

#include <stdlib.h>

// Third Party Headers:
#include "lldb/API/SBError.h"

// In-house headers:
#include "MICmnLLDBDebugSessionInfo.h"
#include "MICmnLLDBProxySBValue.h"
#include "MIUtilString.h"

//++
//------------------------------------------------------------------------------------
// Details: Retrieve the numerical value from the SBValue object. If the
// function fails
//          it could indicate the SBValue object does not represent an internal
//          type.
// Type:    Static method.
// Args:    vrValue - (R) The SBValue object to get a value from.
//          vwValue - (W) The numerical value.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool CMICmnLLDBProxySBValue::GetValueAsUnsigned(const lldb::SBValue &vrValue,
                                                MIuint64 &vwValue) {
  lldb::SBValue &rValue = const_cast<lldb::SBValue &>(vrValue);
  bool bCompositeType = true;
  MIuint64 nFailValue = 0;
  MIuint64 nValue = rValue.GetValueAsUnsigned(nFailValue);
  if (nValue == nFailValue) {
    nFailValue = 5; // Some arbitrary number
    nValue = rValue.GetValueAsUnsigned(nFailValue);
    if (nValue != nFailValue) {
      bCompositeType = false;
      vwValue = nValue;
    }
  } else {
    bCompositeType = false;
    vwValue = nValue;
  }

  return (bCompositeType ? MIstatus::failure : MIstatus::success);
}

//++
//------------------------------------------------------------------------------------
// Details: Retrieve the numerical value from the SBValue object. If the
// function fails
//          it could indicate the SBValue object does not represent an internal
//          type.
// Type:    Static method.
// Args:    vrValue - (R) The SBValue object to get a value from.
//          vwValue - (W) The numerical value.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed.
// Throws:  None.
//--
bool CMICmnLLDBProxySBValue::GetValueAsSigned(const lldb::SBValue &vrValue,
                                              MIint64 &vwValue) {
  lldb::SBValue &rValue = const_cast<lldb::SBValue &>(vrValue);
  bool bCompositeType = true;
  MIuint64 nFailValue = 0;
  MIuint64 nValue = rValue.GetValueAsSigned(nFailValue);
  if (nValue == nFailValue) {
    nFailValue = 5; // Some arbitrary number
    nValue = rValue.GetValueAsSigned(nFailValue);
    if (nValue != nFailValue) {
      bCompositeType = false;
      vwValue = nValue;
    }
  } else {
    bCompositeType = false;
    vwValue = nValue;
  }

  return (bCompositeType ? MIstatus::failure : MIstatus::success);
}

//++
//------------------------------------------------------------------------------------
// Details: Retrieve the NUL terminated string from the SBValue object if it of
// the type
//          unsigned char *.
// Type:    Static method.
// Args:    vrValue     - (R) The SBValue object to get a value from.
//          vwCString   - (W) The text data '\0' terminated.
// Return:  MIstatus::success - Functionality succeeded.
//          MIstatus::failure - Functionality failed, not suitable type.
// Throws:  None.
//--
bool CMICmnLLDBProxySBValue::GetCString(const lldb::SBValue &vrValue,
                                        CMIUtilString &vwCString) {
  lldb::SBValue &rValue = const_cast<lldb::SBValue &>(vrValue);
  const char *pCType = rValue.GetTypeName();
  if (pCType == nullptr)
    return MIstatus::failure;

  const char *pType = "unsigned char *";
  if (!CMIUtilString::Compare(pCType, pType))
    return MIstatus::failure;

  const CMIUtilString strAddr(rValue.GetValue());
  MIint64 nNum = 0;
  if (!strAddr.ExtractNumber(nNum))
    return MIstatus::failure;

  CMICmnLLDBDebugSessionInfo &rSessionInfo(
      CMICmnLLDBDebugSessionInfo::Instance());
  lldb::SBProcess sbProcess = rSessionInfo.GetProcess();
  MIuint nBufferSize = 64;
  bool bNeedResize = false;
  char *pBuffer = static_cast<char *>(::malloc(nBufferSize));
  do {
    lldb::SBError error;
    const size_t nReadSize = sbProcess.ReadCStringFromMemory(
        (lldb::addr_t)nNum, pBuffer, nBufferSize, error);
    if (nReadSize == (nBufferSize - 1)) {
      bNeedResize = true;
      nBufferSize = nBufferSize << 1;
      pBuffer = static_cast<char *>(::realloc(pBuffer, nBufferSize));
    } else
      bNeedResize = false;
  } while (bNeedResize);

  vwCString = pBuffer;
  free((void *)pBuffer);

  return MIstatus::success;
}