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jdk/src/hotspot/os/bsd/memMapPrinter_macosx.cpp
Kim Barrett b5727d2762 8375738: Fix -Wzero-as-null-pointer-constant warnings in MacOSX/bsd code 
Reviewed-by: erikj, dholmes
2026-01-21 06:04:09 +00:00

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/*
* Copyright (c) 2023, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2023, 2024, Red Hat, Inc. and/or its affiliates.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*
*/
#if defined(__APPLE__)
#include "cppstdlib/cstdlib.hpp"
#include "nmt/memMapPrinter.hpp"
#include "runtime/os.hpp"
#include "utilities/align.hpp"
#include "utilities/globalDefinitions.hpp"
#include "utilities/ostream.hpp"
#include "utilities/powerOfTwo.hpp"
#include <limits.h>
#include <stdio.h>
#include <libproc.h>
#include <unistd.h>
#include <mach/vm_inherit.h>
#include <mach/vm_prot.h>
#include <mach/mach_vm.h>
// maximum number of mapping records returned
static const int MAX_REGIONS_RETURNED = 1000000;
// ::mmap() on MacOS is a layer on top of Mach system calls, and will allocate in 128MB chunks.
// This code will coalesce a series of identical 128GB chunks (maybe followed by one smaller chunk
// with identical flags) into one.
// Unfortunately, two or more identically allocated contiguous sections will appear as one, if the
// first section is size 128MB. vmmap(1) has the same issue.
static const int MACOS_PARTIAL_ALLOCATION_SIZE = 128 * M;
class MappingInfo {
proc_regioninfo _rinfo;
public:
const char* _address;
size_t _size;
stringStream _share_buffer;
stringStream _type_buffer;
stringStream _protect_buffer;
stringStream _file_name;
const char* _tag_text;
MappingInfo() : _address(nullptr), _size(0), _tag_text(nullptr) {}
void reset() {
_share_buffer.reset();
_protect_buffer.reset();
_type_buffer.reset();
_file_name.reset();
_tag_text = nullptr;
}
bool canCombine(const proc_regionwithpathinfo& mem_info) {
const proc_regioninfo& n = mem_info.prp_prinfo;
bool cc = _rinfo.pri_size == MACOS_PARTIAL_ALLOCATION_SIZE
&& n.pri_address == (_rinfo.pri_address + _size)
&& n.pri_protection == _rinfo.pri_protection
&& n.pri_max_protection == _rinfo.pri_max_protection
&& n.pri_user_tag == _rinfo.pri_user_tag
&& n.pri_share_mode == _rinfo.pri_share_mode
&& n.pri_offset == 0;
return cc;
}
void combineWithFollowing(const proc_regionwithpathinfo& mem_info) {
_size += mem_info.prp_prinfo.pri_size;
}
void process(const proc_regionwithpathinfo& mem_info) {
reset();
_rinfo = mem_info.prp_prinfo;
_address = (const char*) _rinfo.pri_address;
_size = _rinfo.pri_size;
if (mem_info.prp_vip.vip_path[0] != '\0') {
_file_name.print_raw(mem_info.prp_vip.vip_path);
}
// proc_regionfilename() seems to give bad results, so we don't try to use it here.
char prot[4];
char maxprot[4];
rwbits(_rinfo.pri_protection, prot);
rwbits(_rinfo.pri_max_protection, maxprot);
_protect_buffer.print("%s/%s", prot, maxprot);
get_share_mode(_share_buffer, _rinfo);
_tag_text = tagToStr(_rinfo.pri_user_tag);
}
static void get_share_mode(outputStream& out, const proc_regioninfo& rinfo) {
static const char* share_strings[] = {
"cow", "pvt", "---", "shr", "tsh", "p/a", "s/a", "lpg"
};
assert(SM_COW == 1 && SM_LARGE_PAGE == (sizeof(share_strings)/sizeof(share_strings[0])), "share_mode contants are out of range"); // the +1 offset is intentional; see below
const bool valid_share_mode = rinfo.pri_share_mode >= SM_COW && rinfo.pri_share_mode <= SM_LARGE_PAGE;
if (valid_share_mode) {
int share_mode = rinfo.pri_share_mode;
out.print_raw(share_strings[share_mode - 1]);
} else {
out.print_cr("invalid pri_share_mode (%d)", rinfo.pri_share_mode);
assert(valid_share_mode, "invalid pri_share_mode (%d)", rinfo.pri_share_mode);
}
}
#define X1(TAG, DESCR) X2(TAG, DESCR)
#define X2(TAG, DESCRIPTION) case VM_MEMORY_ ## TAG: return # DESCRIPTION;
static const char* tagToStr(uint32_t user_tag) {
switch (user_tag) {
case 0:
return nullptr;
X1(MALLOC, malloc);
X1(MALLOC_SMALL, malloc_small);
X1(MALLOC_LARGE, malloc_large);
X1(MALLOC_HUGE, malloc_huge);
X1(SBRK, sbrk);
X1(REALLOC, realloc);
X1(MALLOC_TINY, malloc_tiny);
X1(MALLOC_LARGE_REUSABLE, malloc_large_reusable);
X1(MALLOC_LARGE_REUSED, malloc_lage_reused);
X1(ANALYSIS_TOOL, analysis_tool);
X1(MALLOC_NANO, malloc_nano);
X1(MALLOC_MEDIUM, malloc_medium);
X1(MALLOC_PROB_GUARD, malloc_prob_guard);
X1(MACH_MSG, malloc_msg);
X1(IOKIT, IOKit);
X1(STACK, stack);
X1(GUARD, guard);
X1(SHARED_PMAP, shared_pmap);
X1(DYLIB, dylib);
X1(UNSHARED_PMAP, unshared_pmap);
X2(APPKIT, AppKit);
X2(FOUNDATION, Foundation);
X2(COREGRAPHICS, CoreGraphics);
X2(CORESERVICES, CoreServices); // is also VM_MEMORY_CARBON
X2(JAVA, Java);
X2(COREDATA, CoreData);
X1(COREDATA_OBJECTIDS, CodeData_objectids);
X1(ATS, ats);
X1(DYLD, dyld);
X1(DYLD_MALLOC, dyld_malloc);
X1(SQLITE, sqlite);
X1(JAVASCRIPT_CORE, javascript_core);
X1(JAVASCRIPT_JIT_EXECUTABLE_ALLOCATOR, javascript_jit_executable_allocator);
X1(JAVASCRIPT_JIT_REGISTER_FILE, javascript_jit_register_file);
X1(OPENCL, OpenCL);
X2(COREIMAGE, CoreImage);
X2(IMAGEIO, ImageIO);
X2(COREPROFILE, CoreProfile);
X1(APPLICATION_SPECIFIC_1, application_specific_1);
X1(APPLICATION_SPECIFIC_16, application_specific_16);
X1(OS_ALLOC_ONCE, os_alloc_once);
X1(GENEALOGY, genealogy);
default:
static char buffer[30];
os::snprintf_checked(buffer, sizeof(buffer), "user_tag=0x%x(%d)", user_tag, user_tag);
return buffer;
}
}
static void rwbits(int rw, char bits[4]) {
bits[0] = rw & VM_PROT_READ ? 'r' : '-';
bits[1] = rw & VM_PROT_WRITE ? 'w' : '-';
bits[2] = rw & VM_PROT_EXECUTE ? 'x' : '-';
bits[3] = 0;
}
};
class ProcSmapsSummary {
unsigned _num_mappings;
size_t _private;
size_t _committed; // combined committed size
size_t _reserved; // reserved but not committed
size_t _shared; // combined shared size
size_t _swapped_out; // combined amount of swapped-out memory
public:
ProcSmapsSummary() : _num_mappings(0), _private(0),
_committed(0), _shared(0), _swapped_out(0) {}
void add_mapping(const proc_regioninfo& region_info) {
_num_mappings++;
bool is_private = region_info.pri_share_mode == SM_PRIVATE
|| region_info.pri_share_mode == SM_PRIVATE_ALIASED;
bool is_shared = region_info.pri_share_mode == SM_SHARED
|| region_info.pri_share_mode == SM_SHARED_ALIASED
|| region_info.pri_share_mode == SM_TRUESHARED
|| region_info.pri_share_mode == SM_COW;
bool is_committed = region_info.pri_share_mode == SM_EMPTY
&& region_info.pri_max_protection == VM_PROT_ALL
&& ((region_info.pri_protection & VM_PROT_DEFAULT) == VM_PROT_DEFAULT);
bool is_reserved = region_info.pri_share_mode == SM_EMPTY
&& region_info.pri_max_protection == VM_PROT_ALL
&& region_info.pri_protection == VM_PROT_NONE;
_private += is_private ? region_info.pri_size : 0;
_shared += is_shared ? region_info.pri_size : 0;
_swapped_out += region_info.pri_pages_swapped_out;
_committed += is_committed ? region_info.pri_size : 0;
_reserved += is_reserved ? region_info.pri_size : 0;
}
void print_on(const MappingPrintSession& session) const {
outputStream* st = session.out();
st->print_cr("Number of mappings: %u", _num_mappings);
task_vm_info vm_info;
mach_msg_type_number_t num_out = TASK_VM_INFO_COUNT;
kern_return_t err = task_info(mach_task_self(), TASK_VM_INFO, (task_info_t)(&vm_info), &num_out);
if (err == KERN_SUCCESS) {
st->print_cr(" vsize: %llu (" PROPERFMT ")", vm_info.virtual_size, PROPERFMTARGS((size_t)vm_info.virtual_size));
st->print_cr(" rss: %llu (" PROPERFMT ")", vm_info.resident_size, PROPERFMTARGS((size_t)vm_info.resident_size));
st->print_cr(" peak rss: %llu (" PROPERFMT ")", vm_info.resident_size_peak, PROPERFMTARGS((size_t)vm_info.resident_size_peak));
st->print_cr(" page size: %d (" PROPERFMT ")", vm_info.page_size, PROPERFMTARGS((size_t)vm_info.page_size));
} else {
st->print_cr("error getting vm_info %d", err);
}
st->print_cr(" reserved: %zu (" PROPERFMT ")", _reserved, PROPERFMTARGS(_reserved));
st->print_cr(" committed: %zu (" PROPERFMT ")", _committed, PROPERFMTARGS(_committed));
st->print_cr(" private: %zu (" PROPERFMT ")", _private, PROPERFMTARGS(_private));
st->print_cr(" shared: %zu (" PROPERFMT ")", _shared, PROPERFMTARGS(_shared));
st->print_cr(" swapped out: %zu (" PROPERFMT ")", _swapped_out * vm_info.page_size, PROPERFMTARGS(_swapped_out * vm_info.page_size));
}
};
class ProcSmapsPrinter {
const MappingPrintSession& _session;
public:
ProcSmapsPrinter(const MappingPrintSession& session) :
_session(session)
{}
void print_single_mapping(const proc_regioninfo& region_info, const MappingInfo& mapping_info) const {
outputStream* st = _session.out();
#define INDENT_BY(n) \
if (st->fill_to(n) == 0) { \
st->print(" "); \
}
st->print("%#014.12llx-%#014.12llx", (uint64_t)(mapping_info._address), (uint64_t)(mapping_info._address + mapping_info._size));
INDENT_BY(38);
st->print("%12ld", mapping_info._size);
INDENT_BY(51);
st->print("%s", mapping_info._protect_buffer.base());
INDENT_BY(59);
st->print("%s", mapping_info._share_buffer.base());
st->print("%s", mapping_info._type_buffer.base());
INDENT_BY(64);
st->print("%#11llx", region_info.pri_offset);
INDENT_BY(77);
if (_session.print_nmt_info_for_region((const void*)mapping_info._address, (const void*)(mapping_info._address + mapping_info._size))) {
st->print(" ");
} else {
const char* tag = mapping_info._tag_text;
if (tag != nullptr) {
st->print("[%s] ", tag);
}
}
st->print_raw(mapping_info._file_name.base());
st->cr();
#undef INDENT_BY
}
void print_legend() const {
outputStream* st = _session.out();
st->print_cr("from, to, vsize: address range and size");
st->print_cr("prot: protection:");
st->print_cr(" rwx: read / write / execute");
st->print_cr("share: share mode:");
st->print_cr(" cow: copy on write");
st->print_cr(" pvt: private");
st->print_cr(" shr: shared");
st->print_cr(" tsh: true shared");
st->print_cr(" p/a: private aliased");
st->print_cr(" s/a: shared aliased");
st->print_cr(" lpg: large page");
st->print_cr("offset: offset from start of allocation block");
st->print_cr("vminfo: VM information (requires NMT)");
st->print_cr("file: file mapped, if mapping is not anonymous");
{
StreamIndentor si(st, 16);
_session.print_nmt_flag_legend();
}
st->print_cr("file: file mapped, if mapping is not anonymous");
}
void print_header() const {
outputStream* st = _session.out();
// 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7
// 012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789
// 0x000102890000-0x000102898000 32768 r--/r-- cow 0xc000 /Users/simont/dev/openjdk/jdk/build/macos-aarch64-fastdebug-shenandoah/images/jdk/bin/java
st->print_cr("from to vsize prot share offset vminfo/file");
st->print_cr("==================================================================================================");
}
};
static bool is_interesting(const proc_regionwithpathinfo& info) {
return info.prp_prinfo.pri_share_mode != SM_EMPTY
|| info.prp_prinfo.pri_user_tag != 0
|| info.prp_vip.vip_path[0] != '\0'
|| info.prp_prinfo.pri_protection != 0
|| info.prp_prinfo.pri_max_protection != 0;
}
void MemMapPrinter::pd_print_all_mappings(const MappingPrintSession& session) {
ProcSmapsPrinter printer(session);
ProcSmapsSummary summary;
outputStream* const st = session.out();
const pid_t pid = getpid();
printer.print_legend();
st->cr();
printer.print_header();
proc_regionwithpathinfo region_info_with_path;
MappingInfo mapping_info;
uint64_t address = 0;
int region_count = 0;
while (true) {
if (++region_count > MAX_REGIONS_RETURNED) {
st->print_cr("limit of %d regions reached (results inaccurate)", region_count);
break;
}
::bzero(&region_info_with_path, sizeof(region_info_with_path));
int retval = proc_pidinfo(pid, PROC_PIDREGIONPATHINFO, (uint64_t)address, &region_info_with_path, sizeof(region_info_with_path));
if (retval <= 0) {
break;
} else if (retval < (int)sizeof(region_info_with_path)) {
st->print_cr("proc_pidinfo() returned %d", retval);
assert(false, "proc_pidinfo() returned %d", retval);
}
proc_regioninfo& region_info = region_info_with_path.prp_prinfo;
if (is_interesting(region_info_with_path)) {
if (mapping_info.canCombine(region_info_with_path)) {
mapping_info.combineWithFollowing(region_info_with_path);
} else {
// print previous mapping info
// avoid printing the empty info at the start
if (mapping_info._size != 0) {
printer.print_single_mapping(region_info, mapping_info);
}
summary.add_mapping(region_info);
mapping_info.process(region_info_with_path);
}
}
assert(region_info.pri_size > 0, "size of region is 0");
address = region_info.pri_address + region_info.pri_size;
}
printer.print_single_mapping(region_info_with_path.prp_prinfo, mapping_info);
summary.add_mapping(region_info_with_path.prp_prinfo);
st->cr();
summary.print_on(session);
st->cr();
}
#endif // __APPLE__
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