1// Copyright 2023 The Go Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style
3// license that can be found in the LICENSE file.
4
5package pprof
6
7import (
8	"errors"
9)
10
11// readMapping adds a mapping entry for the text region of the running process.
12// It uses the mach_vm_region region system call to add mapping entries for the
13// text region of the running process. Note that currently no attempt is
14// made to obtain the buildID information.
15func (b *profileBuilder) readMapping() {
16	if !machVMInfo(b.addMapping) {
17		b.addMappingEntry(0, 0, 0, "", "", true)
18	}
19}
20
21func readMainModuleMapping() (start, end uint64, exe, buildID string, err error) {
22	first := true
23	ok := machVMInfo(func(lo, hi, off uint64, file, build string) {
24		if first {
25			start, end = lo, hi
26			exe, buildID = file, build
27		}
28		// May see multiple text segments if rosetta is used for running
29		// the go toolchain itself.
30		first = false
31	})
32	if !ok {
33		return 0, 0, "", "", errors.New("machVMInfo failed")
34	}
35	return start, end, exe, buildID, nil
36}
37