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Add utility function to print stack traces from lldb/gdb. 

Change-Id: I81315a1cd6900dbecfc9a39d9dc4256461163921
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>
This commit is contained in:
Erik Verbruggen 2012-12-04 10:31:31 +01:00 committed by Simon Hausmann
parent a6ffc32325
commit 3b3f3bebcd
3 changed files with 35 additions and 8 deletions
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35
debugging.cpp
View File

@ -32,6 +32,8 @@
#include <iostream>
#define LOW_LEVEL_DEBUGGING_HELPERS
using namespace QQmlJS;
using namespace QQmlJS::Debugging;
@ -63,13 +65,32 @@ VM::Value *FunctionState::local(unsigned idx)
return 0;
}
#ifdef LOW_LEVEL_DEBUGGING_HELPERS
Debugger *globalInstance = 0;
void printStackTrace()
{
if (globalInstance)
globalInstance->printStackTrace();
else
std::cerr << "No debugger." << std::endl;
}
#endif // DO_TRACE_INSTR
Debugger::Debugger(VM::ExecutionEngine *engine)
: _engine(engine)
{
#ifdef LOW_LEVEL_DEBUGGING_HELPERS
globalInstance = this;
#endif // DO_TRACE_INSTR
}
Debugger::~Debugger()
{
#ifdef LOW_LEVEL_DEBUGGING_HELPERS
globalInstance = 0;
#endif // DO_TRACE_INSTR
qDeleteAll(_functionInfo.values());
}
@ -129,9 +150,9 @@ void Debugger::enterFunction(FunctionState *state)
#ifdef DO_TRACE_INSTR
QString n = name(_callStack[callIndex(state->context())].function);
std::cerr << "*** Entering \"" << qPrintable(n) << "\" with" << state->context()->variableEnvironment->argumentCount << "args" << std::endl;
for (unsigned i = 0; i < state->context()->variableEnvironment->argumentCount; ++i)
std::cerr << " " << i << ": " << currentArg(i) << std::endl;
std::cerr << "*** Entering \"" << qPrintable(n) << "\" with " << state->context()->variableEnvironment->argumentCount << " args" << std::endl;
// for (unsigned i = 0; i < state->context()->variableEnvironment->argumentCount; ++i)
// std::cerr << " " << i << ": " << currentArg(i) << std::endl;
#endif // DO_TRACE_INSTR
}
@ -171,6 +192,14 @@ const char *Debugger::currentTemp(unsigned idx) const
return qPrintable(state->temp(idx)->toString(state->context())->toQString());
}
void Debugger::printStackTrace() const
{
for (int i = _callStack.size() - 1; i >=0; --i) {
QString n = name(_callStack[i].function);
std::cerr << "\tframe #" << i << ": " << qPrintable(n) << std::endl;
}
}
int Debugger::callIndex(VM::ExecutionContext *context)
{
for (int idx = _callStack.size() - 1; idx >= 0; --idx) {

1
debugging.h
View File

@ -121,6 +121,7 @@ public: // debugging hooks
const char *currentArg(unsigned idx) const;
const char *currentLocal(unsigned idx) const;
const char *currentTemp(unsigned idx) const;
void printStackTrace() const;
private:
int callIndex(VM::ExecutionContext *context);

7
moth/qv4vme_moth.cpp
View File

@ -7,7 +7,7 @@
#ifdef DO_TRACE_INSTR
# define TRACE_INSTR(I) fprintf(stderr, "executing a %s\n", #I);
# define TRACE(n, str, ...) { fprintf(stderr, " %s : ", #n); fprintf(stderr, str, __VA_ARGS__); fprintf(stderr, "\n"); }
# define TRACE(n, str, ...) { char buf[4096]; snprintf(buf, 4096, str, __VA_ARGS__); fprintf(stderr, " %s : %s\n", #n, buf); }
#else
# define TRACE_INSTR(I)
# define TRACE(n, str, ...)
@ -154,9 +154,6 @@ VM::Value VME::operator()(QQmlJS::VM::ExecutionContext *context, const uchar *co
MOTH_BEGIN_INSTR(LoadClosure)
VM::Value c = __qmljs_init_closure(instr.value, context);
TEMP(instr.targetTempIndex) = c;
#ifdef DO_TRACE_INSTR
qDebug() << "loaded:" << c.toString(context)->toQString();
#endif
MOTH_END_INSTR(LoadClosure)
MOTH_BEGIN_INSTR(LoadName)
@ -341,7 +338,7 @@ VM::Value VME::operator()(QQmlJS::VM::ExecutionContext *context, const uchar *co
MOTH_BEGIN_INSTR(Ret)
VM::Value result = TEMP(instr.tempIndex);
TRACE(Ret, "returning value %s", result.toString(context)->toQString().toUtf8().constData());
// TRACE(Ret, "returning value %s", result.toString(context)->toQString().toUtf8().constData());
return result;
MOTH_END_INSTR(Ret)