75 lines
1.9 KiB
C++
75 lines
1.9 KiB
C++
#ifndef ELFSPY_LAMBDA_H
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#define ELFSPY_LAMBDA_H
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#include <elfspy/Hook.h>
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#include <utility>
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namespace spy
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{
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extern std::vector<IHook *> hook_list;
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/**
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* @namespace spy
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* @class Lambda
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* This replaces an existing function with a lambda, so that all calls to
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* the program are made to the lambda.
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* The constructor installs the lambda in place of the function, the destructor
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* uninstalls it
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*/
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template <typename H, typename L, typename ReturnType, typename... ArgTypes>
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class Lambda : public IHook
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{
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public:
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Lambda(H& hook, L& lambda);
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~Lambda();
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private:
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static ReturnType function(ArgTypes... argtypes);
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H& hook_;
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L lambda_;
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static Lambda* instance_;
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ReturnType (*func_)(ArgTypes...);
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};
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template <typename H, typename L, typename ReturnType, typename... ArgTypes>
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Lambda<H, L, ReturnType, ArgTypes...>*
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Lambda<H, L, ReturnType, ArgTypes...>::instance_ = nullptr;
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template <typename H, typename L, typename ReturnType, typename... ArgTypes>
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inline Lambda<H, L, ReturnType, ArgTypes...>::Lambda(H& hook, L& lambda)
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:hook_(hook)
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,lambda_(lambda)
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{
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instance_ = this;
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func_ = hook.patch(&Lambda<H, L, ReturnType, ArgTypes...>::function);
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}
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template <typename H, typename L, typename ReturnType, typename... ArgTypes>
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inline Lambda<H, L, ReturnType, ArgTypes...>::~Lambda()
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{
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hook_.patch(func_);
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instance_ = nullptr;
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}
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template <typename H, typename L, typename ReturnType, typename... ArgTypes>
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ReturnType Lambda<H, L, ReturnType, ArgTypes...>::function(ArgTypes... argtypes)
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{
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return instance_->lambda_(std::forward<ArgTypes>(argtypes)...);
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}
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template <typename H, typename L>
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inline auto new_fake(H& hook, L& lambda)
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-> typename H::template Export<Lambda, H, L, typename H::Result>::Type*
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{
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using Install =
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typename H::template Export<Lambda, H, L, typename H::Result>::Type;
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auto instance = new Install(hook, lambda);
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hook_list.push_back (instance);
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return instance;
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}
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} // namespace elfspy
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#endif
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