实现基础web服务器

vendor/github.com/bytedance/sonic/internal/loader/loader_windows.go

@@ -0,0 +1,111 @@
+//go:build windows
+// +build windows
+
+/*
+ * Copyright 2021 ByteDance Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package loader
+
+import (
+    `fmt`
+    `os`
+    `reflect`
+    `syscall`
+    `unsafe`
+)
+
+const (
+    MEM_COMMIT  = 0x00001000
+    MEM_RESERVE = 0x00002000
+)
+
+var (
+    libKernel32                = syscall.NewLazyDLL("KERNEL32.DLL")
+    libKernel32_VirtualAlloc   = libKernel32.NewProc("VirtualAlloc")
+    libKernel32_VirtualProtect = libKernel32.NewProc("VirtualProtect")
+)
+
+type Loader   []byte
+type Function unsafe.Pointer
+
+func (self Loader) Load(fn string, fp int, args int, argPtrs []bool, localPtrs []bool) (f Function) {
+    p := os.Getpagesize()
+    n := (((len(self) - 1) / p) + 1) * p
+
+    /* register the function */
+    m := mmap(n)
+    v := fmt.Sprintf("runtime.__%s_%x", fn, m)
+    
+    registerFunction(v, m, uintptr(n), fp, args, uintptr(len(self)), argPtrs, localPtrs)
+
+    /* reference as a slice */
+    s := *(*[]byte)(unsafe.Pointer(&reflect.SliceHeader {
+        Data : m,
+        Cap  : n,
+        Len  : len(self),
+    }))
+
+    /* copy the machine code, and make it executable */
+    copy(s, self)
+    mprotect(m, n)
+    return Function(&m)
+}
+
+func mmap(nb int) uintptr {
+    addr, err := winapi_VirtualAlloc(0, nb, MEM_COMMIT|MEM_RESERVE, syscall.PAGE_READWRITE)
+    if err != nil {
+        panic(err)
+    }
+    return addr
+}
+
+func mprotect(p uintptr, nb int) (oldProtect int) {
+    err := winapi_VirtualProtect(p, nb, syscall.PAGE_EXECUTE_READ, &oldProtect)
+    if err != nil {
+        panic(err)
+    }
+    return
+}
+
+// winapi_VirtualAlloc allocate memory
+// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualalloc
+func winapi_VirtualAlloc(lpAddr uintptr, dwSize int, flAllocationType int, flProtect int) (uintptr, error) {
+    r1, _, err := libKernel32_VirtualAlloc.Call(
+        lpAddr,
+        uintptr(dwSize),
+        uintptr(flAllocationType),
+        uintptr(flProtect),
+    )
+    if r1 == 0 {
+        return 0, err
+    }
+    return r1, nil
+}
+
+// winapi_VirtualProtect change memory protection
+// Doc: https://docs.microsoft.com/en-us/windows/win32/api/memoryapi/nf-memoryapi-virtualprotect
+func winapi_VirtualProtect(lpAddr uintptr, dwSize int, flNewProtect int, lpflOldProtect *int) error {
+    r1, _, err := libKernel32_VirtualProtect.Call(
+        lpAddr,
+        uintptr(dwSize),
+        uintptr(flNewProtect),
+        uintptr(unsafe.Pointer(lpflOldProtect)),
+    )
+    if r1 == 0 {
+        return err
+    }
+    return nil
+}