}

// Mmap manager, for use by operating system-specific implementations.

type mmapper struct {
	sync.Mutex
	active map[*byte][]byte // active mappings; key is last byte in mapping
	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
	munmap func(addr uintptr, length uintptr) error
}

func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {

		Line:     make([]Line, len(src.Line)),
		IsFolded: src.IsFolded,
	}
	for i, ln := range src.Line {
		l.Line[i] = pm.mapLine(ln)
	}
	// Check memoization table. Must be done on the remapped location to
	// account for the remapped mapping ID.
	k := l.key()
	if ll, ok := pm.locations[k]; ok {
		pm.locationsByID.set(src.ID, ll)
		return ll
	}
	pm.locationsByID.set(src.ID, l)
	pm.locations[k] = l

// Mmap manager, for use by operating system-specific implementations.

type mmapper struct {
	sync.Mutex
	active map[*byte][]byte // active mappings; key is last byte in mapping
	mmap   func(addr, length uintptr, prot, flags, fd int, offset int64) (uintptr, error)
	munmap func(addr uintptr, length uintptr) error
}

func (m *mmapper) Mmap(fd int, offset int64, length int, prot int, flags int) (data []byte, err error) {

	DM_DEV_STATUS                               = 0xc138fd07
	DM_DEV_SUSPEND                              = 0xc138fd06
	DM_DEV_WAIT                                 = 0xc138fd08
	DM_DIR                                      = "mapper"
	DM_GET_TARGET_VERSION                       = 0xc138fd11
	DM_IMA_MEASUREMENT_FLAG                     = 0x80000
	DM_INACTIVE_PRESENT_FLAG                    = 0x40
	DM_INTERNAL_SUSPEND_FLAG                    = 0x40000

}

func tokenMap(mapping func(t Token) Token) func(TokenReader) TokenReader {
	return func(src TokenReader) TokenReader {
		return mapper{
			t: src,
			f: mapping,
		}
	}
}

type mapper struct {
	t TokenReader
	f func(Token) Token
}

func (m mapper) Token() (Token, error) {
	tok, err := m.t.Token()
	if err != nil {
		return nil, err
	}
	return m.f(tok), nil
}

//go:build linux || netbsd

package unix

import "unsafe"

type mremapMmapper struct {
	mmapper
	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,
}

// Use of this source code is governed by a BSD-style
// 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,

// binary search, which would make it O(N*log(M)).
func (p *Profile) remapMappingIDs() {
	// Some profile handlers will incorrectly set regions for the main
	// executable if its section is remapped. Fix them through heuristics.

	if len(p.Mapping) > 0 {
		// Remove the initial mapping if named '/anon_hugepage' and has a
		// consecutive adjacent mapping.

// special handling. For kernel mappings, tools (like perf) use the address of
// the kernel relocation symbol (_text or _stext) as the mmap start. Additionally,
// for obfuscation, ChromeOS profiles have the kernel image remapped to the 0-th page.
func kernelBase(loadSegment *elf.ProgHeader, stextOffset *uint64, start, limit, offset uint64) (uint64, bool) {
	const (
		// PAGE_OFFSET for PowerPC64, see arch/powerpc/Kconfig in the kernel sources.