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#pragma once
#include "StackTrace.h"
#include "Lock.h"
/**
* Pluggable output stream for the stack info.
*/
class GenericOutput : NoCopy {
public:
virtual void put(const wchar *str) = 0;
virtual void put(const char *str) = 0;
virtual void put(size_t i) = 0;
virtual void putHex(size_t i) = 0;
// Called if a single frame consists of multiple frames due to inlining.
virtual void nextFrame() = 0;
};
/**
* wostream implementation.
*/
class StdOutput : public GenericOutput {
public:
StdOutput(wostream &to) : to(to), frameNumber(0) {}
virtual void put(const wchar *str) { to << str; }
virtual void put(const char *str) { to << str; }
virtual void put(size_t i) { to << i; }
virtual void putHex(size_t i) { to << toHex(i); }
virtual void nextFrame();
private:
nat frameNumber;
wostream &to;
};
/**
* Pluggable interface for collecting and showing information on the stack.
*/
class StackInfo : NoCopy {
public:
// Called when the system allocates an array of StackFrame structures so that a backend can keep
// any data referred by the trace alive until the trace is not needed anymore. The function is
// called after the stack trace is populated.
virtual void alloc(StackFrame *frames, nat count) const;
virtual void free(StackFrame *frames, nat count) const;
// Called during stack trace collection to resolve a possibly garbage collected pointer into a
// base pointer for the function and an offset. Returns true if we know of this function.
virtual bool translate(void *ip, void *&fnBase, int &offset) const = 0;
// Format a function call. Only called for the StackInfo instance whose 'translate' returned true.
virtual void format(GenericOutput &to, void *fnBase, int offset) const = 0;
};
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