| // Copyright 2023 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 ( | |
| "internal/byteorder" | |
| "os" | |
| "unsafe" | |
| ) | |
| func isExecutable(protection int32) bool { | |
| return (protection&_VM_PROT_EXECUTE) != 0 && (protection&_VM_PROT_READ) != 0 | |
| } | |
| // machVMInfo uses the mach_vm_region region system call to add mapping entries | |
| // for the text region of the running process. | |
| func machVMInfo(addMapping func(lo, hi, offset uint64, file, buildID string)) bool { | |
| added := false | |
| var addr uint64 = 0x1 | |
| for { | |
| var memRegionSize uint64 | |
| var info machVMRegionBasicInfoData | |
| // Get the first address and page size. | |
| kr := mach_vm_region( | |
| &addr, | |
| &memRegionSize, | |
| unsafe.Pointer(&info)) | |
| if kr != 0 { | |
| if kr == _MACH_SEND_INVALID_DEST { | |
| // No more memory regions. | |
| return true | |
| } | |
| return added // return true if at least one mapping was added | |
| } | |
| if isExecutable(info.Protection) { | |
| // NOTE: the meaning/value of Offset is unclear. However, | |
| // this likely doesn't matter as the text segment's file | |
| // offset is usually 0. | |
| addMapping(addr, | |
| addr+memRegionSize, | |
| byteorder.LEUint64(info.Offset[:]), | |
| regionFilename(addr), | |
| "") | |
| added = true | |
| } | |
| addr += memRegionSize | |
| } | |
| } | |
| func regionFilename(address uint64) string { | |
| buf := make([]byte, _MAXPATHLEN) | |
| r := proc_regionfilename( | |
| os.Getpid(), | |
| address, | |
| unsafe.SliceData(buf), | |
| int64(cap(buf))) | |
| if r == 0 { | |
| return "" | |
| } | |
| return string(buf[:r]) | |
| } | |
| // mach_vm_region and proc_regionfilename are implemented by | |
| // the runtime package (runtime/sys_darwin.go). | |
| // | |
| //go:noescape | |
| func mach_vm_region(address, region_size *uint64, info unsafe.Pointer) int32 | |
| //go:noescape | |
| func proc_regionfilename(pid int, address uint64, buf *byte, buflen int64) int32 | |