mirror of
https://github.com/libretro/dolphin
synced 2024-11-04 20:43:51 -05:00
80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
// Copyright 2014 Dolphin Emulator Project
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// Licensed under GPLv2+
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// Refer to the license.txt file included.
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#include <chrono>
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#include "Common/CommonTypes.h"
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#include "Common/Timer.h"
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#include "Core/MemTools.h"
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#include "Core/PowerPC/JitCommon/JitBase.h"
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#include "Core/PowerPC/JitInterface.h"
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// include order is important
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#include <gtest/gtest.h> // NOLINT
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enum
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{
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#ifdef _WIN32
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PAGE_GRAN = 0x10000
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#else
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PAGE_GRAN = 0x1000
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#endif
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};
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class PageFaultFakeJit : public JitBase
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{
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public:
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// CPUCoreBase methods
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void Init() override {}
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void Shutdown() override {}
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void ClearCache() override {}
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void Run() override {}
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void SingleStep() override {}
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const char* GetName() const override { return nullptr; }
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// JitBase methods
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JitBaseBlockCache* GetBlockCache() override { return nullptr; }
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void Jit(u32 em_address) override {}
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const CommonAsmRoutinesBase* GetAsmRoutines() override { return nullptr; }
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virtual bool HandleFault(uintptr_t access_address, SContext* ctx) override
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{
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m_pre_unprotect_time = std::chrono::high_resolution_clock::now();
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Common::UnWriteProtectMemory(m_data, PAGE_GRAN, /*allowExecute*/ false);
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m_post_unprotect_time = std::chrono::high_resolution_clock::now();
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return true;
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}
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void* m_data;
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std::chrono::time_point<std::chrono::high_resolution_clock> m_pre_unprotect_time,
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m_post_unprotect_time;
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};
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TEST(PageFault, PageFault)
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{
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EMM::InstallExceptionHandler();
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void* data = Common::AllocateMemoryPages(PAGE_GRAN);
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EXPECT_NE(data, nullptr);
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Common::WriteProtectMemory(data, PAGE_GRAN, false);
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PageFaultFakeJit pfjit;
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JitInterface::SetJit(&pfjit);
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pfjit.m_data = data;
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auto start = std::chrono::high_resolution_clock::now();
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*(volatile int*)data = 5;
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auto end = std::chrono::high_resolution_clock::now();
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#define AS_NS(diff) \
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((unsigned long long)std::chrono::duration_cast<std::chrono::nanoseconds>(diff).count())
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EMM::UninstallExceptionHandler();
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JitInterface::SetJit(nullptr);
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printf("page fault timing:\n");
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printf("start->HandleFault %llu ns\n", AS_NS(pfjit.m_pre_unprotect_time - start));
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printf("UnWriteProtectMemory %llu ns\n",
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AS_NS(pfjit.m_post_unprotect_time - pfjit.m_pre_unprotect_time));
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printf("HandleFault->end %llu ns\n", AS_NS(end - pfjit.m_post_unprotect_time));
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printf("total %llu ns\n", AS_NS(end - start));
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}
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