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// Copyright 2022 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package pprof
import (
"errors"
"internal/syscall/windows"
"syscall"
)
// readMapping adds memory mapping information to the profile.
func (b *profileBuilder) readMapping() {
snap, err := createModuleSnapshot()
if err != nil {
// pprof expects a map entry, so fake one, when we haven't added anything yet.
b.addMappingEntry(0, 0, 0, "", "", true)
return
}
defer func() { _ = syscall.CloseHandle(snap) }()
var module windows.ModuleEntry32
module.Size = uint32(windows.SizeofModuleEntry32)
err = windows.Module32First(snap, &module)
if err != nil {
// pprof expects a map entry, so fake one, when we haven't added anything yet.
b.addMappingEntry(0, 0, 0, "", "", true)
return
}
for err == nil {
exe := syscall.UTF16ToString(module.ExePath[:])
b.addMappingEntry(
uint64(module.ModBaseAddr),
uint64(module.ModBaseAddr)+uint64(module.ModBaseSize),
0,
exe,
peBuildID(exe),
false,
)
err = windows.Module32Next(snap, &module)
}
}
func readMainModuleMapping() (start, end uint64, err error) {
snap, err := createModuleSnapshot()
if err != nil {
return 0, 0, err
}
defer func() { _ = syscall.CloseHandle(snap) }()
var module windows.ModuleEntry32
module.Size = uint32(windows.SizeofModuleEntry32)
err = windows.Module32First(snap, &module)
if err != nil {
return 0, 0, err
}
return uint64(module.ModBaseAddr), uint64(module.ModBaseAddr) + uint64(module.ModBaseSize), nil
}
func createModuleSnapshot() (syscall.Handle, error) {
for {
snap, err := syscall.CreateToolhelp32Snapshot(windows.TH32CS_SNAPMODULE|windows.TH32CS_SNAPMODULE32, uint32(syscall.Getpid()))
var errno syscall.Errno
if err != nil && errors.As(err, &errno) && errno == windows.ERROR_BAD_LENGTH {
// When CreateToolhelp32Snapshot(SNAPMODULE|SNAPMODULE32, ...) fails
// with ERROR_BAD_LENGTH then it should be retried until it succeeds.
continue
}
return snap, err
}
}
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