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#pragma once
#include "StackInfo.h"
#include "CppInfo.h"
/**
* Keep track of a global set of registered lookup objects.
*/
class StackInfoSet : NoCopy {
public:
// Register a new FnLookup. Returns its ID, or -1 if a lookup of the same type was already registered.
int attach(const StackInfo &lookup);
// Detach a previously registered FnLookup.
void detach(int id);
// 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.
void alloc(StackFrame *frames, nat count);
void free(StackFrame *frames, nat count);
// Translate a function pointer into base pointer and offset. Returns an ID of the backend that
// captured the data.
int translate(void *ip, void *&fnBase, int &offset);
// Format a function call. Pass the 'id' returned from 'tranlsate'.
void format(GenericOutput &to, int id, void *fnBase, int offset);
private:
StackInfoSet();
friend StackInfoSet &stackInfo();
// All currently registered lookup objects. May contain null entries.
vector<const StackInfo *> data;
// Protect the data here with a lock.
util::Lock lock;
// Fallback.
CppInfo cppInfo;
};
// Get the single instance of StackInfoSet.
// Note: This is implemented externally since we need a single instance per process.
StackInfoSet &stackInfo();
// Declare the global stackInfo implementation.
#define DEFINE_STACK_INFO() \
StackInfoSet &stackInfo() { \
static StackInfoSet v; \
return v; \
}
/**
* Helper class to register and de-register Lookup objects.
*/
template <class T>
class RegisterInfo {
public:
RegisterInfo() {
id = stackInfo().attach(lookup);
}
~RegisterInfo() {
stackInfo().detach(id);
}
T *operator ->() {
return &lookup;
}
private:
T lookup;
int id;
};
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