public int WriteAt(IDebugMemoryContext2 startMemoryContext, uint count, byte[] buffer)
{
CONTEXT_INFO[] contextInfos = new CONTEXT_INFO[1];
startMemoryContext.GetInfo(enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS, contextInfos);
ulong address;
if (!DebugEngineUtil.GetAddressFromString(contextInfos[0].bstrAddress, out address))
{
Trace.WriteLine($"Failed to convert {contextInfos[0].bstrAddress} to address");
return(VSConstants.E_FAIL);
}
SbError error;
var bytesWrote = _lldbProcess.WriteMemory(address, buffer, count, out error);
if (error.Fail())
{
Trace.WriteLine($"Error: {error.GetCString()}");
return(VSConstants.E_FAIL);
}
if (bytesWrote != count)
{
Trace.WriteLine(
$"Warning: only written {bytesWrote} out of {count} bytes to memory.");
return(VSConstants.S_FALSE);
}
return(VSConstants.S_OK);
}
public void ParseAddressFromDecString()
{
const string INPUT = "12345";
const ulong EXPECTED = 12345;
ulong output;
Assert.AreEqual(true, DebugEngineUtil.GetAddressFromString(INPUT, out output));
Assert.AreEqual(EXPECTED, output);
}
public void ParseAddressFromHexString()
{
const string INPUT = "0xdeadbeef";
const ulong EXPECTED = 0xdeadbeef;
ulong output;
Assert.AreEqual(true, DebugEngineUtil.GetAddressFromString(INPUT, out output));
Assert.AreEqual(EXPECTED, output);
}
public int CanSetNextStatement(IDebugStackFrame2 stackFrameOrigin,
IDebugCodeContext2 codeContextDestination)
{
stackFrameOrigin.GetThread(out IDebugThread2 threadOrigin);
if (threadOrigin == null)
{
return(VSConstants.E_FAIL);
}
threadOrigin.GetThreadId(out uint threadIdOrigin);
if (threadIdOrigin != _id)
{
return(VSConstants.S_FALSE);
}
var contextInfosDestination = new CONTEXT_INFO[1];
int result = codeContextDestination.GetInfo(
enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS | enum_CONTEXT_INFO_FIELDS.CIF_FUNCTION,
contextInfosDestination);
if (result != VSConstants.S_OK)
{
return(result);
}
string functionNameOrigin;
if (!DebugEngineUtil.GetAddressFromString(contextInfosDestination[0].bstrAddress,
out ulong addressPc))
{
return(VSConstants.E_FAIL);
}
if (stackFrameOrigin is IDebugStackFrame stackFrameOriginCast)
{
stackFrameOriginCast.GetNameWithSignature(out functionNameOrigin);
}
else
{
stackFrameOrigin.GetName(out functionNameOrigin);
}
if (addressPc != _remoteThread.GetFrameAtIndex(0).GetPC() &&
contextInfosDestination[0].bstrFunction != functionNameOrigin)
{
return(VSConstants.S_FALSE);
}
return(VSConstants.S_OK);
}
public int ReadAt(IDebugMemoryContext2 startMemoryContext, uint countToRead, byte[] memory,
out uint countRead, ref uint countUnreadable)
{
// |countUnreadable| can be null when calling from C++ according to Microsoft's doc.
// However, countUnreadable == null will always return false in C# as an uint can never
// be null. Accessing |countUnreadable| here might cause a NullReferenceException.
// According to Microsoft's doc, |countUnreadable| is useful when there are
// non -consecutive blocks of memory that are readable. For example, if we want to read
// 100 bytes at a certain address and only the first 50 bytes and the last 20 bytes are
// readable. |countRead| would be 50 and |countUnreadable| should be 30. However,
// LLDB's ReadMemory() doesn't provide this kind of output, so this is not
// straightforward to implement.
// TODO We should estimate |countUnreadable| from page boundaries.
// Otherwise, the memory view might be missing some valid contents in the beginnings
// of mapped regions.
// Note: We need to make sure we never return S_OK while setting countRead and
// countUnreadable to zero. That can send the memory view into an infinite loop
// and freeze Visual Studio ((internal)).
CONTEXT_INFO[] contextInfo = new CONTEXT_INFO[1];
startMemoryContext.GetInfo(enum_CONTEXT_INFO_FIELDS.CIF_ADDRESS, contextInfo);
ulong address;
if (DebugEngineUtil.GetAddressFromString(contextInfo[0].bstrAddress, out address))
{
SbError error;
try
{
countRead = Convert.ToUInt32(_lldbProcess.ReadMemory(address, memory,
countToRead, out error));
if (error.Fail() || countRead == 0)
{
countRead = 0;
return(VSConstants.E_FAIL);
}
return(VSConstants.S_OK);
}
catch (OverflowException e)
{
Trace.WriteLine($"Warning: Failed to read memory.{Environment.NewLine}" +
$"{e.ToString()}");
countRead = 0;
return(VSConstants.E_FAIL);
}
}
countRead = 0;
return(VSConstants.E_FAIL);
}
