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debuginfo.cpp
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debuginfo.cpp
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// This file is a part of Julia. License is MIT: https://julialang.org/license
#include "platform.h"
#include "llvm-version.h"
#include <llvm/ExecutionEngine/ExecutionEngine.h>
#include <llvm/ExecutionEngine/JITEventListener.h>
#include <llvm/DebugInfo/DIContext.h>
#include <llvm/DebugInfo/DWARF/DWARFContext.h>
#include <llvm/Object/SymbolSize.h>
#include <llvm/Support/MemoryBuffer.h>
#include <llvm/IR/Function.h>
#include <llvm/ADT/StringRef.h>
#include <llvm/ADT/StringMap.h>
#include <llvm/IR/DebugInfo.h>
#include <llvm/IR/DataLayout.h>
#include <llvm/IR/Mangler.h>
#include <llvm/ExecutionEngine/RuntimeDyld.h>
#include <llvm/BinaryFormat/Magic.h>
#include <llvm/Object/MachO.h>
#include <llvm/Object/COFF.h>
#include <llvm/Object/ELFObjectFile.h>
using namespace llvm;
#include "julia.h"
#include "julia_internal.h"
#include "debuginfo.h"
#if defined(_OS_LINUX_)
# include <link.h>
#endif
#include "processor.h"
#include <string>
#include <map>
#include <vector>
#include <set>
#include "julia_assert.h"
#ifdef _OS_DARWIN_
#include <CoreFoundation/CoreFoundation.h>
#endif
typedef object::SymbolRef SymRef;
// Any function that acquires this lock must be either a unmanaged thread
// or in the GC safe region and must NOT allocate anything through the GC
// while holding this lock.
// Certain functions in this file might be called from an unmanaged thread
// and cannot have any interaction with the julia runtime
static uv_rwlock_t threadsafe;
extern "C" void jl_init_debuginfo(void)
{
uv_rwlock_init(&threadsafe);
}
extern "C" void jl_lock_profile(void)
{
uv_rwlock_rdlock(&threadsafe);
}
extern "C" void jl_unlock_profile(void)
{
uv_rwlock_rdunlock(&threadsafe);
}
// some actions aren't signal (especially profiler) safe so we acquire a lock
// around them to establish a mutual exclusion with unwinding from a signal
template <typename T>
static void jl_profile_atomic(T f)
{
uv_rwlock_wrlock(&threadsafe);
#ifndef _OS_WINDOWS_
sigset_t sset;
sigset_t oset;
sigfillset(&sset);
pthread_sigmask(SIG_BLOCK, &sset, &oset);
#endif
f();
#ifndef _OS_WINDOWS_
pthread_sigmask(SIG_SETMASK, &oset, NULL);
#endif
uv_rwlock_wrunlock(&threadsafe);
}
// --- storing and accessing source location metadata ---
struct ObjectInfo {
const object::ObjectFile *object;
size_t SectionSize;
ptrdiff_t slide;
object::SectionRef Section;
DIContext *context;
};
// Maintain a mapping of unrealized function names -> linfo objects
// so that when we see it get emitted, we can add a link back to the linfo
// that it came from (providing name, type signature, file info, etc.)
static StringMap<jl_code_instance_t*> codeinst_in_flight;
static std::string mangle(StringRef Name, const DataLayout &DL)
{
std::string MangledName;
{
raw_string_ostream MangledNameStream(MangledName);
Mangler::getNameWithPrefix(MangledNameStream, Name, DL);
}
return MangledName;
}
void jl_add_code_in_flight(StringRef name, jl_code_instance_t *codeinst, const DataLayout &DL)
{
codeinst_in_flight[mangle(name, DL)] = codeinst;
}
#ifdef _OS_WINDOWS_
#if defined(_CPU_X86_64_)
void *lookupWriteAddressFor(RTDyldMemoryManager *memmgr, void *rt_addr);
#endif
#endif
#if defined(_OS_WINDOWS_)
static void create_PRUNTIME_FUNCTION(uint8_t *Code, size_t Size, StringRef fnname,
uint8_t *Section, size_t Allocated, uint8_t *UnwindData)
{
// GC safe
DWORD mod_size = 0;
#if defined(_CPU_X86_64_)
PRUNTIME_FUNCTION tbl = (PRUNTIME_FUNCTION)malloc_s(sizeof(RUNTIME_FUNCTION));
tbl->BeginAddress = (DWORD)(Code - Section);
tbl->EndAddress = (DWORD)(Code - Section + Size);
tbl->UnwindData = (DWORD)(UnwindData - Section);
#else // defined(_CPU_X86_64_)
Section += (uintptr_t)Code;
mod_size = Size;
#endif
if (0) {
JL_LOCK_NOGC(&jl_in_stackwalk);
if (mod_size && !SymLoadModuleEx(GetCurrentProcess(), NULL, NULL, NULL, (DWORD64)Section, mod_size, NULL, SLMFLAG_VIRTUAL)) {
static int warned = 0;
if (!warned) {
jl_printf(JL_STDERR, "WARNING: failed to insert module info for backtrace: %lu\n", GetLastError());
warned = 1;
}
}
else {
size_t len = fnname.size()+1;
if (len > MAX_SYM_NAME)
len = MAX_SYM_NAME;
char *name = (char*)alloca(len);
memcpy(name, fnname.data(), len-1);
name[len-1] = 0;
if (!SymAddSymbol(GetCurrentProcess(), (ULONG64)Section, name,
(DWORD64)Code, (DWORD)Size, 0)) {
jl_printf(JL_STDERR, "WARNING: failed to insert function name %s into debug info: %lu\n", name, GetLastError());
}
}
JL_UNLOCK_NOGC(&jl_in_stackwalk);
}
#if defined(_CPU_X86_64_)
jl_profile_atomic([&]() {
if (!RtlAddFunctionTable(tbl, 1, (DWORD64)Section)) {
static int warned = 0;
if (!warned) {
jl_printf(JL_STDERR, "WARNING: failed to insert function stack unwind info: %lu\n", GetLastError());
warned = 1;
}
}
});
#endif
}
#endif
struct revcomp {
bool operator() (const size_t& lhs, const size_t& rhs) const
{ return lhs>rhs; }
};
struct strrefcomp {
bool operator() (const StringRef& lhs, const StringRef& rhs) const
{
return lhs.compare(rhs) > 0;
}
};
class JuliaJITEventListener: public JITEventListener
{
std::map<size_t, ObjectInfo, revcomp> objectmap;
std::map<size_t, std::pair<size_t, jl_method_instance_t *>, revcomp> linfomap;
public:
JuliaJITEventListener(){}
virtual ~JuliaJITEventListener() {}
jl_method_instance_t *lookupLinfo(size_t pointer) JL_NOTSAFEPOINT
{
uv_rwlock_rdlock(&threadsafe);
auto region = linfomap.lower_bound(pointer);
jl_method_instance_t *linfo = NULL;
if (region != linfomap.end() && pointer < region->first + region->second.first)
linfo = region->second.second;
uv_rwlock_rdunlock(&threadsafe);
return linfo;
}
virtual void NotifyObjectEmitted(const object::ObjectFile &Object,
const RuntimeDyld::LoadedObjectInfo &L)
{
return _NotifyObjectEmitted(Object, L, nullptr);
}
virtual void _NotifyObjectEmitted(const object::ObjectFile &Object,
const RuntimeDyld::LoadedObjectInfo &L,
RTDyldMemoryManager *memmgr)
{
jl_ptls_t ptls = jl_current_task->ptls;
// This function modify codeinst->fptr in GC safe region.
// This should be fine since the GC won't scan this field.
int8_t gc_state = jl_gc_safe_enter(ptls);
auto SavedObject = L.getObjectForDebug(Object).takeBinary();
// If the debug object is unavailable, save (a copy of) the original object
// for our backtraces.
// This copy seems unfortunate, but there doesn't seem to be a way to take
// ownership of the original buffer.
if (!SavedObject.first) {
auto NewBuffer = MemoryBuffer::getMemBufferCopy(
Object.getData(), Object.getFileName());
auto NewObj = cantFail(object::ObjectFile::createObjectFile(NewBuffer->getMemBufferRef()));
SavedObject = std::make_pair(std::move(NewObj), std::move(NewBuffer));
}
const object::ObjectFile &debugObj = *SavedObject.first.release();
SavedObject.second.release();
object::section_iterator EndSection = debugObj.section_end();
std::map<StringRef, object::SectionRef, strrefcomp> loadedSections;
for (const object::SectionRef &lSection: Object.sections()) {
auto sName = lSection.getName();
if (sName)
loadedSections[*sName] = lSection;
}
auto getLoadAddress = [&] (const StringRef &sName) -> uint64_t {
auto search = loadedSections.find(sName);
if (search == loadedSections.end())
return 0;
return L.getSectionLoadAddress(search->second);
};
#ifdef _CPU_ARM_
// ARM does not have/use .eh_frame
uint64_t arm_exidx_addr = 0;
size_t arm_exidx_len = 0;
uint64_t arm_text_addr = 0;
size_t arm_text_len = 0;
for (auto §ion: Object.sections()) {
bool istext = false;
if (section.isText()) {
istext = true;
}
else {
auto sName = section.getName();
if (!sName)
continue;
if (sName.get() != ".ARM.exidx") {
continue;
}
}
uint64_t loadaddr = L.getSectionLoadAddress(section);
size_t seclen = section.getSize();
if (istext) {
arm_text_addr = loadaddr;
arm_text_len = seclen;
if (!arm_exidx_addr) {
continue;
}
}
else {
arm_exidx_addr = loadaddr;
arm_exidx_len = seclen;
if (!arm_text_addr) {
continue;
}
}
unw_dyn_info_t *di = new unw_dyn_info_t;
di->gp = 0;
di->format = UNW_INFO_FORMAT_ARM_EXIDX;
di->start_ip = (uintptr_t)arm_text_addr;
di->end_ip = (uintptr_t)(arm_text_addr + arm_text_len);
di->u.rti.name_ptr = 0;
di->u.rti.table_data = arm_exidx_addr;
di->u.rti.table_len = arm_exidx_len;
jl_profile_atomic([&]() {
_U_dyn_register(di);
});
break;
}
#endif
#if defined(_OS_WINDOWS_)
uint64_t SectionAddrCheck = 0;
uint64_t SectionLoadCheck = 0;
uint64_t SectionWriteCheck = 0;
uint8_t *UnwindData = NULL;
#if defined(_CPU_X86_64_)
uint8_t *catchjmp = NULL;
for (const object::SymbolRef &sym_iter : debugObj.symbols()) {
StringRef sName = cantFail(sym_iter.getName());
uint8_t **pAddr = NULL;
if (sName.equals("__UnwindData")) {
pAddr = &UnwindData;
}
else if (sName.equals("__catchjmp")) {
pAddr = &catchjmp;
}
if (pAddr) {
uint64_t Addr = cantFail(sym_iter.getAddress());
auto Section = cantFail(sym_iter.getSection());
assert(Section != EndSection && Section->isText());
uint64_t SectionAddr = Section->getAddress();
sName = cantFail(Section->getName());
uint64_t SectionLoadAddr = getLoadAddress(sName);
assert(SectionLoadAddr);
if (SectionAddrCheck) // assert that all of the Sections are at the same location
assert(SectionAddrCheck == SectionAddr &&
SectionLoadCheck == SectionLoadAddr);
SectionAddrCheck = SectionAddr;
SectionLoadCheck = SectionLoadAddr;
SectionWriteCheck = SectionLoadAddr;
if (memmgr)
SectionWriteCheck = (uintptr_t)lookupWriteAddressFor(memmgr,
(void*)SectionLoadAddr);
Addr += SectionWriteCheck - SectionLoadAddr;
*pAddr = (uint8_t*)Addr;
}
}
assert(catchjmp);
assert(UnwindData);
assert(SectionAddrCheck);
assert(SectionLoadCheck);
assert(!memcmp(catchjmp, "\0\0\0\0\0\0\0\0\0\0\0\0", 12) &&
!memcmp(UnwindData, "\0\0\0\0\0\0\0\0\0\0\0\0", 12));
catchjmp[0] = 0x48;
catchjmp[1] = 0xb8; // mov RAX, QWORD PTR [&__julia_personality]
*(uint64_t*)(&catchjmp[2]) = (uint64_t)&__julia_personality;
catchjmp[10] = 0xff;
catchjmp[11] = 0xe0; // jmp RAX
UnwindData[0] = 0x09; // version info, UNW_FLAG_EHANDLER
UnwindData[1] = 4; // size of prolog (bytes)
UnwindData[2] = 2; // count of unwind codes (slots)
UnwindData[3] = 0x05; // frame register (rbp) = rsp
UnwindData[4] = 4; // second instruction
UnwindData[5] = 0x03; // mov RBP, RSP
UnwindData[6] = 1; // first instruction
UnwindData[7] = 0x50; // push RBP
*(DWORD*)&UnwindData[8] = (DWORD)(catchjmp - (uint8_t*)SectionWriteCheck); // relative location of catchjmp
#endif // defined(_OS_X86_64_)
#endif // defined(_OS_WINDOWS_)
auto symbols = object::computeSymbolSizes(debugObj);
bool first = true;
for (const auto &sym_size : symbols) {
const object::SymbolRef &sym_iter = sym_size.first;
object::SymbolRef::Type SymbolType = cantFail(sym_iter.getType());
if (SymbolType != object::SymbolRef::ST_Function) continue;
uint64_t Addr = cantFail(sym_iter.getAddress());
auto Section = cantFail(sym_iter.getSection());
if (Section == EndSection) continue;
if (!Section->isText()) continue;
uint64_t SectionAddr = Section->getAddress();
StringRef secName = cantFail(Section->getName());
uint64_t SectionLoadAddr = getLoadAddress(secName);
Addr -= SectionAddr - SectionLoadAddr;
StringRef sName = cantFail(sym_iter.getName());
uint64_t SectionSize = Section->getSize();
size_t Size = sym_size.second;
#if defined(_OS_WINDOWS_)
if (SectionAddrCheck)
assert(SectionAddrCheck == SectionAddr &&
SectionLoadCheck == SectionLoadAddr);
SectionAddrCheck = SectionAddr;
SectionLoadCheck = SectionLoadAddr;
create_PRUNTIME_FUNCTION(
(uint8_t*)(uintptr_t)Addr, (size_t)Size, sName,
(uint8_t*)(uintptr_t)SectionLoadAddr, (size_t)SectionSize, UnwindData);
#endif
StringMap<jl_code_instance_t*>::iterator codeinst_it = codeinst_in_flight.find(sName);
jl_code_instance_t *codeinst = NULL;
if (codeinst_it != codeinst_in_flight.end()) {
codeinst = codeinst_it->second;
codeinst_in_flight.erase(codeinst_it);
}
jl_profile_atomic([&]() {
if (codeinst)
linfomap[Addr] = std::make_pair(Size, codeinst->def);
if (first) {
ObjectInfo tmp = {&debugObj,
(size_t)SectionSize,
(ptrdiff_t)(SectionAddr - SectionLoadAddr),
*Section,
nullptr,
};
objectmap[SectionLoadAddr] = tmp;
first = false;
}
});
}
jl_gc_safe_leave(ptls, gc_state);
}
// must implement if we ever start freeing code
// virtual void NotifyFreeingObject(const ObjectImage &Object) {}
// virtual void NotifyFreeingObject(const object::ObjectFile &Obj) {}
std::map<size_t, ObjectInfo, revcomp>& getObjectMap() JL_NOTSAFEPOINT
{
return objectmap;
}
};
JL_DLLEXPORT void ORCNotifyObjectEmitted(JITEventListener *Listener,
const object::ObjectFile &Object,
const RuntimeDyld::LoadedObjectInfo &L,
RTDyldMemoryManager *memmgr)
{
((JuliaJITEventListener*)Listener)->_NotifyObjectEmitted(Object, L, memmgr);
}
static std::pair<char *, bool> jl_demangle(const char *name) JL_NOTSAFEPOINT
{
// This function is not allowed to reference any TLS variables since
// it can be called from an unmanaged thread on OSX.
const char *start = name + 6;
const char *end = name + strlen(name);
char *ret;
if (end <= start)
goto done;
if (strncmp(name, "japi1_", 6) &&
strncmp(name, "japi3_", 6) &&
strncmp(name, "julia_", 6) &&
strncmp(name, "jsys1_", 6) &&
strncmp(name, "jlsys_", 6))
goto done;
if (*start == '\0')
goto done;
while (*(--end) != '_') {
char c = *end;
if (c < '0' || c > '9')
goto done;
}
if (end <= start)
goto done;
ret = (char*)malloc_s(end - start + 1);
memcpy(ret, start, end - start);
ret[end - start] = '\0';
return std::make_pair(ret, true);
done:
return std::make_pair(strdup(name), false);
}
static JuliaJITEventListener *jl_jit_events;
JITEventListener *CreateJuliaJITEventListener(void)
{
jl_jit_events = new JuliaJITEventListener();
return jl_jit_events;
}
// *frames is a one element array containing whatever we could come up
// with for the current frame. here we'll try to expand it using debug info
// func_name and file_name are either NULL or malloc'd pointers
static int lookup_pointer(
object::SectionRef Section, DIContext *context,
jl_frame_t **frames, size_t pointer, int64_t slide,
bool demangle, bool noInline) JL_NOTSAFEPOINT
{
// This function is not allowed to reference any TLS variables
// since it can be called from an unmanaged thread on OSX.
if (!context || !Section.getObject()) {
if (demangle) {
char *oldname = (*frames)[0].func_name;
if (oldname != NULL) {
std::pair<char *, bool> demangled = jl_demangle(oldname);
(*frames)[0].func_name = demangled.first;
(*frames)[0].fromC = !demangled.second;
free(oldname);
}
else {
// We do this to hide the jlcall wrappers when getting julia backtraces,
// but it is still good to have them for regular lookup of C frames.
// Technically not true, but we don't want them
// in julia backtraces, so close enough
(*frames)[0].fromC = 1;
}
}
return 1;
}
DILineInfoSpecifier infoSpec(DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath,
DILineInfoSpecifier::FunctionNameKind::ShortName);
// DWARFContext/DWARFUnit update some internal tables during these queries, so
// a lock is needed.
uv_rwlock_wrlock(&threadsafe);
auto inlineInfo = context->getInliningInfoForAddress(makeAddress(Section, pointer + slide), infoSpec);
uv_rwlock_wrunlock(&threadsafe);
int fromC = (*frames)[0].fromC;
int n_frames = inlineInfo.getNumberOfFrames();
if (n_frames == 0) {
// no line number info available in the context, return without the context
return lookup_pointer(object::SectionRef(), NULL, frames, pointer, slide, demangle, noInline);
}
if (noInline)
n_frames = 1;
if (n_frames > 1) {
jl_frame_t *new_frames = (jl_frame_t*)calloc(sizeof(jl_frame_t), n_frames);
memcpy(&new_frames[n_frames - 1], *frames, sizeof(jl_frame_t));
free(*frames);
*frames = new_frames;
}
for (int i = 0; i < n_frames; i++) {
bool inlined_frame = i != n_frames - 1;
DILineInfo info;
if (!noInline) {
info = inlineInfo.getFrame(i);
}
else {
uv_rwlock_wrlock(&threadsafe);
info = context->getLineInfoForAddress(makeAddress(Section, pointer + slide), infoSpec);
uv_rwlock_wrunlock(&threadsafe);
}
jl_frame_t *frame = &(*frames)[i];
std::string func_name(info.FunctionName);
if (inlined_frame) {
frame->inlined = 1;
frame->fromC = fromC;
if (!fromC) {
std::size_t semi_pos = func_name.find(';');
if (semi_pos != std::string::npos) {
func_name = func_name.substr(0, semi_pos);
frame->linfo = NULL; // TODO: if (new_frames[n_frames - 1].linfo) frame->linfo = lookup(func_name in linfo)?
}
}
}
if (func_name == "<invalid>")
frame->func_name = NULL;
else
jl_copy_str(&frame->func_name, func_name.c_str());
if (!frame->func_name)
frame->fromC = 1;
frame->line = info.Line;
std::string file_name(info.FileName);
if (file_name == "<invalid>")
frame->file_name = NULL;
else
jl_copy_str(&frame->file_name, file_name.c_str());
}
return n_frames;
}
#ifdef _OS_DARWIN_
#include <mach-o/dyld.h>
#else
#define LC_UUID 0
#endif
#ifndef _OS_WINDOWS_
#include <dlfcn.h>
#endif
typedef struct {
const llvm::object::ObjectFile *obj;
DIContext *ctx;
int64_t slide;
} objfileentry_t;
typedef std::map<uint64_t, objfileentry_t, revcomp> obfiletype;
static obfiletype objfilemap;
static bool getObjUUID(llvm::object::MachOObjectFile *obj, uint8_t uuid[16]) JL_NOTSAFEPOINT
{
for (auto Load : obj->load_commands())
{
if (Load.C.cmd == LC_UUID) {
memcpy(uuid, ((const MachO::uuid_command*)Load.Ptr)->uuid, 16);
return true;
}
}
return false;
}
struct debug_link_info {
StringRef filename;
uint32_t crc32;
};
static debug_link_info getDebuglink(const object::ObjectFile &Obj) JL_NOTSAFEPOINT
{
debug_link_info info = {};
for (const object::SectionRef &Section: Obj.sections()) {
Expected<StringRef> sName = Section.getName();
if (sName && *sName == ".gnu_debuglink")
{
auto found = Section.getContents();
if (found) {
StringRef Contents = *found;
size_t length = Contents.find('\0');
info.filename = Contents.substr(0, length);
info.crc32 = *(const uint32_t*)Contents.substr(LLT_ALIGN(length + 1, 4), 4).data();
break;
}
}
}
return info;
}
/*
* crc function from https://svnweb.freebsd.org/base/head/sys/libkern/crc32.c (and lldb)
*
* COPYRIGHT (C) 1986 Gary S. Brown. You may use this program, or
* code or tables extracted from it, as desired without restriction.
*/
static uint32_t
calc_gnu_debuglink_crc32(const void *buf, size_t size)
{
static const uint32_t g_crc32_tab[] =
{
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
};
const uint8_t *p = (const uint8_t *)buf;
uint32_t crc;
crc = ~0U;
while (size--)
crc = g_crc32_tab[(crc ^ *p++) & 0xFF] ^ (crc >> 8);
return crc ^ ~0U;
}
static Expected<object::OwningBinary<object::ObjectFile>>
openDebugInfo(StringRef debuginfopath, const debug_link_info &info)
{
auto SplitFile = MemoryBuffer::getFile(debuginfopath);
if (std::error_code EC = SplitFile.getError()) {
return errorCodeToError(EC);
}
uint32_t crc32 = calc_gnu_debuglink_crc32(
SplitFile.get()->getBufferStart(),
SplitFile.get()->getBufferSize());
if (crc32 != info.crc32) {
return errorCodeToError(object::object_error::arch_not_found);
}
auto error_splitobj = object::ObjectFile::createObjectFile(
SplitFile.get().get()->getMemBufferRef(),
file_magic::unknown);
if (!error_splitobj) {
return error_splitobj.takeError();
}
// successfully validated and loaded split debug info file
return object::OwningBinary<object::ObjectFile>(
std::move(error_splitobj.get()),
std::move(SplitFile.get()));
}
static uint64_t jl_sysimage_base;
static jl_sysimg_fptrs_t sysimg_fptrs;
static jl_method_instance_t **sysimg_fvars_linfo;
static size_t sysimg_fvars_n;
void jl_register_fptrs(uint64_t sysimage_base, const jl_sysimg_fptrs_t *fptrs,
jl_method_instance_t **linfos, size_t n)
{
jl_sysimage_base = (uintptr_t)sysimage_base;
sysimg_fptrs = *fptrs;
sysimg_fvars_linfo = linfos;
sysimg_fvars_n = n;
}
template<typename T>
static inline void ignoreError(T &err) JL_NOTSAFEPOINT
{
#if !defined(NDEBUG)
// Needed only with LLVM assertion build
consumeError(err.takeError());
#endif
}
static void get_function_name_and_base(llvm::object::SectionRef Section, size_t pointer, int64_t slide, bool insysimage,
void **saddr, char **name, bool untrusted_dladdr) JL_NOTSAFEPOINT
{
// Assume we only need base address for sysimg for now
if (!insysimage || !sysimg_fptrs.base)
saddr = nullptr;
bool needs_saddr = saddr && (!*saddr || untrusted_dladdr);
bool needs_name = name && (!*name || untrusted_dladdr);
// Try platform specific methods first since they are usually faster
if (needs_saddr) {
#if (defined(_OS_LINUX_) || defined(_OS_FREEBSD_)) && !defined(JL_DISABLE_LIBUNWIND)
unw_proc_info_t pip;
// Seems that libunwind may return NULL IP depending on what info it finds...
if (unw_get_proc_info_by_ip(unw_local_addr_space, pointer,
&pip, NULL) == 0 && pip.start_ip) {
*saddr = (void*)pip.start_ip;
needs_saddr = false;
}
#endif
#if defined(_OS_WINDOWS_) && defined(_CPU_X86_64_)
DWORD64 ImageBase;
PRUNTIME_FUNCTION fn = RtlLookupFunctionEntry(pointer, &ImageBase, NULL);
if (fn) {
*saddr = (void*)(ImageBase + fn->BeginAddress);
needs_saddr = false;
}
#endif
}
if (Section.getObject() && (needs_saddr || needs_name)) {
size_t distance = (size_t)-1;
SymRef sym_found;
for (auto sym : Section.getObject()->symbols()) {
if (!Section.containsSymbol(sym))
continue;
auto addr = sym.getAddress();
if (!addr)
continue;
size_t symptr = addr.get();
if (symptr > pointer + slide)
continue;
size_t new_dist = pointer + slide - symptr;
if (new_dist > distance)
continue;
distance = new_dist;
sym_found = sym;
}
if (distance != (size_t)-1) {
if (needs_saddr) {
uintptr_t addr = cantFail(sym_found.getAddress());
*saddr = (void*)(addr - slide);
needs_saddr = false;
}
if (needs_name) {
if (auto name_or_err = sym_found.getName()) {
auto nameref = name_or_err.get();
size_t len = nameref.size();
*name = (char*)realloc_s(*name, len + 1);
(*name)[len] = 0;
memcpy(*name, nameref.data(), len);
needs_name = false;
}
}
}
}
#ifdef _OS_WINDOWS_
// For ntdll and msvcrt since we are currently only parsing DWARF debug info through LLVM
if (!insysimage && needs_name) {
static char frame_info_func[
sizeof(SYMBOL_INFO) +
MAX_SYM_NAME * sizeof(TCHAR)];
DWORD64 dwDisplacement64 = 0;
DWORD64 dwAddress = pointer;
PSYMBOL_INFO pSymbol = (PSYMBOL_INFO)frame_info_func;
pSymbol->SizeOfStruct = sizeof(SYMBOL_INFO);
pSymbol->MaxNameLen = MAX_SYM_NAME;
JL_LOCK_NOGC(&jl_in_stackwalk);
if (SymFromAddr(GetCurrentProcess(), dwAddress, &dwDisplacement64, pSymbol)) {
// errors are ignored
jl_copy_str(name, pSymbol->Name);
}
JL_UNLOCK_NOGC(&jl_in_stackwalk);
}
#endif
}
static objfileentry_t &find_object_file(uint64_t fbase, StringRef fname) JL_NOTSAFEPOINT
{
int isdarwin = 0, islinux = 0, iswindows = 0;
#if defined(_OS_DARWIN_)
isdarwin = 1;
#elif defined(_OS_LINUX_) || defined(_OS_FREEBSD_)
islinux = 1;
#elif defined(_OS_WINDOWS_)
iswindows = 1;
#endif
(void)iswindows;
// GOAL: Read debuginfo from file
// TODO: need read/write lock here for objfilemap synchronization
obfiletype::iterator it = objfilemap.find(fbase);
if (it != objfilemap.end())
// Return cached value
return it->second;
auto &entry = objfilemap[fbase]; // default initialized
// GOAL: Assign errorobj
StringRef objpath;
std::string debuginfopath;
uint8_t uuid[16], uuid2[16];
if (isdarwin) {
// Hide Darwin symbols (e.g. CoreFoundation) from non-Darwin systems.
#ifdef _OS_DARWIN_
size_t msize = (size_t)(((uint64_t)-1) - fbase);
std::unique_ptr<MemoryBuffer> membuf = MemoryBuffer::getMemBuffer(
StringRef((const char *)fbase, msize), "", false);
auto origerrorobj = llvm::object::ObjectFile::createObjectFile(
membuf->getMemBufferRef(), file_magic::unknown);
if (!origerrorobj)
return entry;
llvm::object::MachOObjectFile *morigobj = (llvm::object::MachOObjectFile*)
origerrorobj.get().get();
// First find the uuid of the object file (we'll use this to make sure we find the
// correct debug symbol file).
if (!getObjUUID(morigobj, uuid))
return entry;
// On macOS, debug symbols are not contained in the dynamic library.
// Use DBGCopyFullDSYMURLForUUID from the private DebugSymbols framework
// to make use of spotlight to find the dSYM file. If that fails, lookup
// the dSYM file in the same directory as the dynamic library. TODO: If
// the DebugSymbols framework is moved or removed, an alternative would
// be to directly query Spotlight for the dSYM bundle.
typedef CFURLRef (*DBGCopyFullDSYMURLForUUIDfn)(CFUUIDRef, CFURLRef) JL_NOTSAFEPOINT;
DBGCopyFullDSYMURLForUUIDfn DBGCopyFullDSYMURLForUUID = NULL;
// First, try to load the private DebugSymbols framework.
CFURLRef dsfmwkurl = CFURLCreateWithFileSystemPath(
kCFAllocatorDefault,
CFSTR("/System/Library/PrivateFrameworks/DebugSymbols.framework"),
kCFURLPOSIXPathStyle, true);
CFBundleRef dsfmwkbundle =
CFBundleCreate(kCFAllocatorDefault, dsfmwkurl);
CFRelease(dsfmwkurl);
if (dsfmwkbundle) {
DBGCopyFullDSYMURLForUUID =
(DBGCopyFullDSYMURLForUUIDfn)CFBundleGetFunctionPointerForName(
dsfmwkbundle, CFSTR("DBGCopyFullDSYMURLForUUID"));
}
if (DBGCopyFullDSYMURLForUUID != NULL) {
// Prepare UUID and shared object path URL.
CFUUIDRef objuuid = CFUUIDCreateWithBytes(
kCFAllocatorDefault, uuid[0], uuid[1], uuid[2], uuid[3],
uuid[4], uuid[5], uuid[6], uuid[7], uuid[8], uuid[9], uuid[10],
uuid[11], uuid[12], uuid[13], uuid[14], uuid[15]);
CFURLRef objurl = CFURLCreateFromFileSystemRepresentation(
kCFAllocatorDefault, (UInt8 const *)fname.data(),
(CFIndex)strlen(fname.data()), FALSE);
// Call private DBGCopyFullDSYMURLForUUID() to find dSYM.
CFURLRef dsympathurl = DBGCopyFullDSYMURLForUUID(objuuid, objurl);
CFRelease(objuuid);
CFRelease(objurl);
char objpathcstr[PATH_MAX];
if (dsympathurl != NULL &&
CFURLGetFileSystemRepresentation(
dsympathurl, true, (UInt8 *)objpathcstr,
(CFIndex)sizeof(objpathcstr))) {
// The dSYM was found. Copy its path.
debuginfopath = objpathcstr;
objpath = debuginfopath;
CFRelease(dsympathurl);
}
}
if (dsfmwkbundle) {
CFRelease(dsfmwkbundle);
}
if (objpath.empty()) {
// Fall back to simple path relative to the dynamic library.
size_t sep = fname.rfind('/');
debuginfopath = fname.str();
debuginfopath += ".dSYM/Contents/Resources/DWARF/";
debuginfopath += fname.substr(sep + 1);
objpath = debuginfopath;
}
#endif
}
else {
// On Linux systems we need to mmap another copy because of the permissions on the mmap'ed shared library.
// On Windows we need to mmap another copy since reading the in-memory copy seems to return object_error:unexpected_eof
objpath = fname;
}
auto errorobj = llvm::object::ObjectFile::createObjectFile(objpath);
// GOAL: Find obj, context, slide (if above succeeded)
if (errorobj) {
auto *debugobj = errorobj->getBinary();
if (islinux) {
// if the file has a .gnu_debuglink section,
// try to load its companion file instead
// in the expected locations
// for now, we don't support the build-id method
debug_link_info info = getDebuglink(*debugobj);
if (!info.filename.empty()) {
size_t sep = fname.rfind('/');
Expected<object::OwningBinary<object::ObjectFile>>
DebugInfo(errorCodeToError(std::make_error_code(std::errc::no_such_file_or_directory)));
// Can't find a way to construct an empty Expected object
// that can be ignored.
if (fname.substr(sep + 1) != info.filename) {
debuginfopath = fname.substr(0, sep + 1).str();
debuginfopath += info.filename;
ignoreError(DebugInfo);
DebugInfo = openDebugInfo(debuginfopath, info);
}
if (!DebugInfo) {
debuginfopath = fname.substr(0, sep + 1).str();
debuginfopath += ".debug/";
debuginfopath += info.filename;
ignoreError(DebugInfo);
DebugInfo = openDebugInfo(debuginfopath, info);
}
if (!DebugInfo) {
debuginfopath = "/usr/lib/debug/";
debuginfopath += fname.substr(0, sep + 1);
debuginfopath += info.filename;
ignoreError(DebugInfo);
DebugInfo = openDebugInfo(debuginfopath, info);
}
if (DebugInfo) {
errorobj = std::move(DebugInfo);
// Yes, we've checked, and yes LLVM want us to check again.
assert(errorobj);
debugobj = errorobj->getBinary();
}
else {
ignoreError(DebugInfo);
}
}
}
if (isdarwin) {
// verify the UUID matches
if (!getObjUUID((llvm::object::MachOObjectFile*)debugobj, uuid2) ||
memcmp(uuid, uuid2, sizeof(uuid)) != 0) {
return entry;
}
}
int64_t slide = 0;
if (auto *OF = dyn_cast<const object::COFFObjectFile>(debugobj)) {
assert(iswindows);
slide = OF->getImageBase() - fbase;
}
else {
slide = -(int64_t)fbase;
}
auto context = DWARFContext::create(*debugobj).release();
auto binary = errorobj->takeBinary();
binary.first.release();
binary.second.release();