llvm-project/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.
//
//===----------------------------------------------------------------------===//

//++
// File:		MICmnLLDBProxySBValue.cpp
//
// Overview:	CMICmnLLDBProxySBValue implementation.
//
// Environment:	Compilers:	Visual C++ 12.
//							gcc (Ubuntu/Linaro 4.8.1-10ubuntu9) 4.8.1
//				Libraries:	See MIReadmetxt. 
//
// Copyright:	None.
//--

#include <stdlib.h>

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

// In-house headers:
#include "MICmnLLDBProxySBValue.h"
#include "MIUtilString.h"
#include "MICmnLLDBDebugSessionInfo.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 arbitary 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 arbitary 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 MIchar * 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 & rProcess = rSessionInfo.m_lldbProcess;
	MIuint nBufferSize = 64;
	bool bNeedResize = false;
	char * pBuffer = static_cast< char * >( ::malloc( nBufferSize ) );
	do
	{
		lldb::SBError error;
		const size_t nReadSize = rProcess.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;
}