1 files changed, 74 insertions, 0 deletions
diff --git a/pal/windows.h b/pal/windows.h
new file mode 100755
index 0000000..3a2a7cf
--- /dev/null
+++ b/pal/windows.h
@@ -0,0 +1,74 @@
+#pragma once
+
+#include <cassert>
+#include <iostream>
+#include <windows.h>
+#include <psapi.h>
+
+#define DECL_MAIN int __cdecl wmain()
+
+#define NOINLINE __declspec(noinline)
+
+namespace pal {
+
+static constexpr size_t kPageSize = 0x1000;
+
+inline void* MemReserve(size_t len) {
+    void* buf = VirtualAlloc(nullptr, len, MEM_RESERVE, PAGE_NOACCESS);
+    if (buf == nullptr) {
+        DWORD last_error = GetLastError();
+        std::cerr << "Reserving memory with VirtualAlloc failed. Error code: " << last_error << std::endl;
+        return nullptr;
+    }
+
+    return buf;
+}
+
+inline bool MemCommit(void* p, size_t len) {
+    void* committed = VirtualAlloc(p, len, MEM_COMMIT, PAGE_READWRITE);
+    if (committed == nullptr) {
+        DWORD last_error = GetLastError();
+        std::cerr << "Committing memory with VirtualAlloc failed. Error code: " << last_error << std::endl;
+        return false;
+    }
+
+    return true;
+}
+
+inline void MemFree(void* p, size_t /*len*/) {
+    VirtualFree(p, 0, MEM_RELEASE);
+}
+
+inline size_t GetPeakMemoryUse() {
+    PROCESS_MEMORY_COUNTERS mem;
+    bool res = GetProcessMemoryInfo(GetCurrentProcess(), &mem, sizeof mem);
+    if (!res) {
+        DWORD last_error = GetLastError();
+        std::cerr << "GetProcessMemoryInfo failed. Error code: " << last_error << std::endl;
+        return 0;
+    }
+
+    return mem.PeakWorkingSetSize;
+}
+
+inline uint64_t ConvertFiletimeToMicroseconds(FILETIME t) {
+    ULARGE_INTEGER li;
+    li.LowPart = t.dwLowDateTime;
+    li.HighPart = t.dwHighDateTime;
+    return static_cast<uint64_t>(li.QuadPart) / 10;
+}
+
+inline uint64_t GetCpuTime() {
+    FILETIME a, b, c, d;
+    if (GetProcessTimes(GetCurrentProcess(), &a, &b, &c, &d) != 0) {
+        auto kernel_time = ConvertFiletimeToMicroseconds(c);
+        auto user_time = ConvertFiletimeToMicroseconds(d);
+        return user_time + kernel_time;
+    } else {
+        std::cerr << "failed to get CPU time\n";
+        assert(false);
+        return 0;
+    }
+}
+
+} // namespace pal