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Debugger[New CDB]: Workaround for Step into.

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Fix Step into by introducing an additional step when hitting
on a jmp-instruction.
This commit is contained in:
Friedemann Kleint
2011-01-05 11:34:35 +01:00
parent 11fc831598
commit bc0568bac5
2 changed files with 20 additions and 3 deletions
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22
src/plugins/debugger/cdb2/cdbengine2.cpp
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@@ -300,7 +300,8 @@ CdbEngine::CdbEngine(const DebuggerStartParameters &sp, const OptionsPtr &option
m_operateByInstruction(true), // Default CDB setting
m_notifyEngineShutdownOnTermination(false),
m_hasDebuggee(false),
m_elapsedLogTime(0)
m_elapsedLogTime(0),
m_sourceStepInto(false)
{
Utils::SavedAction *assemblerAction = theAssemblerAction();
m_operateByInstructionPending = assemblerAction->isChecked();
@@ -706,6 +707,8 @@ unsigned CdbEngine::debuggerCapabilities() const
void CdbEngine::executeStep()
{
postCommand(QByteArray("t"), 0); // Step into-> t (trace)
if (!m_operateByInstruction)
m_sourceStepInto = true; // See explanation at handleStackTrace().
notifyInferiorRunRequested();
}
@@ -1869,13 +1872,26 @@ static StackFrames parseFrames(const QByteArray &data)
void CdbEngine::handleStackTrace(const CdbExtensionCommandPtr &command)
{
// Parse frames, find current.
// Parse frames, find current. Special handling for step into:
// When stepping into on an actual function (source mode) by executing 't', an assembler
// frame pointing at the jmp instruction is hit (noticeable by top function being
// 'ILT+'). If that is the case, execute another 't' to step into the actual function. .
// Note that executing 't 2' does not work since it steps 2 instructions on a non-call code line.
const bool sourceStepInto = m_sourceStepInto;
m_sourceStepInto = false;
if (command->success) {
int current = -1;
StackFrames frames = parseFrames(command->reply);
const int count = frames.size();
for (int i = 0; i < count; i++) {
if (!frames.at(i).file.isEmpty()) {
const bool hasFile = !frames.at(i).file.isEmpty();
// jmp-frame hit by step into, do another 't' and abort sequence.
if (!hasFile && i == 0 && sourceStepInto && frames.at(i).function.contains(QLatin1String("ILT+"))) {
showMessage(QString::fromAscii("Step into: Call instruction hit, performing additional step..."), LogMisc);
executeStep();
return;
}
if (hasFile) {
frames[i].file = QDir::cleanPath(normalizeFileName(frames.at(i).file));
if (current == -1 && frames[i].usable)
current = i;