// license that can be found in the LICENSE file.

//go:build aix || darwin || dragonfly || freebsd || openbsd || solaris || zos

package unix

var mapper = &mmapper{
	active: make(map[*byte][]byte),
	mmap:   mmap,
	munmap: munmap,

// mmap calls the mmap system call. It is implemented in assembly.
// We only pass the lower 32 bits of file offset to the
// assembly routine; the higher bits (if required), should be provided
// by the assembly routine as 0.
// The err result is an OS error code such as ENOMEM.
func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (p unsafe.Pointer, err int)

	mremap func(oldaddr uintptr, oldlength uintptr, newlength uintptr, flags int, newaddr uintptr) (xaddr uintptr, err error)
}

var mapper = &mremapMmapper{
	mmapper: mmapper{
		active: make(map[*byte][]byte),
		mmap:   mmap,
		munmap: munmap,
	},
	mremap: mremap,
}

func (m *mremapMmapper) Mremap(oldData []byte, newLength int, flags int) (data []byte, err error) {

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package counter

import (
	"bytes"
	"fmt"
	"strings"
	"unsafe"

	"golang.org/x/telemetry/internal/mmap"
)

type File struct {
	Meta  map[string]string
	Count map[string]uint64
}

func Parse(filename string, data []byte) (*File, error) {
	if !bytes.HasPrefix(data, []byte(hdrPrefix)) || len(data) < pageSize {

	case *matcher.Matcher_MatcherTree_:
		var mmap *matcher.Matcher_MatcherTree_MatchMap
		switch t := m.MatcherTree.TreeType.(type) {
		case *matcher.Matcher_MatcherTree_PrefixMatchMap:
			mmap = t.PrefixMatchMap
		case *matcher.Matcher_MatcherTree_ExactMatchMap:
			mmap = t.ExactMatchMap
		default:
			return Mapper{}, false
		}
		return Mapper{Matcher: mmatcher, Map: mmap.Map}, true
	}
	return Mapper{}, false

void
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
{
	uintptr *pbounds;

	/* The memory sanitizer distributed with versions of clang
	   before 3.8 has a bug: if you call mmap before malloc, mmap
	   may return an address that is later overwritten by the msan
	   library.  Avoid this problem by forcing a call to malloc
	   here, before we ever call malloc.

}

void
x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
{
	uintptr *pbounds;

	/* The memory sanitizer distributed with versions of clang
	   before 3.8 has a bug: if you call mmap before malloc, mmap
	   may return an address that is later overwritten by the msan
	   library.  Avoid this problem by forcing a call to malloc
	   here, before we ever call malloc.

}
func thrkill_trampoline()

// mmap is used to do low-level memory allocation via mmap. Don't allow stack
// splits, since this function (used by sysAlloc) is called in a lot of low-level
// parts of the runtime and callers often assume it won't acquire any locks.
//
//go:nosplit
func mmap(addr unsafe.Pointer, n uintptr, prot, flags, fd int32, off uint32) (unsafe.Pointer, int) {

	debug.SetPanicOnFault(true)

	size := syscall.Getpagesize()

	// Map 16 pages of data with a 4-page hole in the middle.
	data, err := syscall.Mmap(-1, 0, 16*size, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_ANON|syscall.MAP_PRIVATE)
	if err != nil {
		log.Fatalf("mmap: %v", err)
	}

	// Create a hole in the mapping that's PROT_NONE.
	// Note that we can't use munmap here because the Go runtime

#include <stdlib.h>
#include <sys/mman.h>

#include "libcgo.h"

uintptr_t
x_cgo_mmap(void *addr, uintptr_t length, int32_t prot, int32_t flags, int32_t fd, uint32_t offset) {
	void *p;

	_cgo_tsan_acquire();
	p = mmap(addr, length, prot, flags, fd, offset);
	_cgo_tsan_release();
	if (p == MAP_FAILED) {
		/* This is what the Go code expects on failure.  */
		return (uintptr_t)errno;
	}
	return (uintptr_t)p;
}

void