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openal-soft/alc/helpers.cpp
Chris Robinson 4254888576 Make IrSize unsigned
2019-09-13 09:38:35 -07:00

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/**
* OpenAL cross platform audio library
* Copyright (C) 2011 by authors.
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
* Or go to http://www.gnu.org/copyleft/lgpl.html
*/
#ifdef _WIN32
#ifdef __MINGW32__
#define _WIN32_IE 0x501
#else
#define _WIN32_IE 0x400
#endif
#endif
#include "config.h"
#include <algorithm>
#include <cerrno>
#include <cstdarg>
#include <cstdlib>
#include <cstdio>
#include <cstring>
#include <mutex>
#include <string>
#ifdef HAVE_DIRENT_H
#include <dirent.h>
#endif
#ifdef HAVE_INTRIN_H
#include <intrin.h>
#endif
#ifdef HAVE_CPUID_H
#include <cpuid.h>
#endif
#ifdef HAVE_SSE_INTRINSICS
#include <xmmintrin.h>
#endif
#ifdef HAVE_SYS_SYSCONF_H
#include <sys/sysconf.h>
#endif
#ifdef HAVE_PROC_PIDPATH
#include <libproc.h>
#endif
#ifdef __FreeBSD__
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#ifndef _WIN32
#include <unistd.h>
#elif defined(_WIN32_IE)
#include <shlobj.h>
#endif
#include "alcmain.h"
#include "almalloc.h"
#include "compat.h"
#include "cpu_caps.h"
#include "fpu_modes.h"
#include "logging.h"
#include "strutils.h"
#include "vector.h"
#if defined(HAVE_GCC_GET_CPUID) && (defined(__i386__) || defined(__x86_64__) || \
defined(_M_IX86) || defined(_M_X64))
using reg_type = unsigned int;
static inline void get_cpuid(int f, reg_type *regs)
{ __get_cpuid(f, &regs[0], &regs[1], &regs[2], &regs[3]); }
#define CAN_GET_CPUID
#elif defined(HAVE_CPUID_INTRINSIC) && (defined(__i386__) || defined(__x86_64__) || \
defined(_M_IX86) || defined(_M_X64))
using reg_type = int;
static inline void get_cpuid(int f, reg_type *regs)
{ (__cpuid)(regs, f); }
#define CAN_GET_CPUID
#endif
int CPUCapFlags = 0;
void FillCPUCaps(int capfilter)
{
int caps = 0;
/* FIXME: We really should get this for all available CPUs in case different
* CPUs have different caps (is that possible on one machine?). */
#ifdef CAN_GET_CPUID
union {
reg_type regs[4];
char str[sizeof(reg_type[4])];
} cpuinf[3] = {{ { 0, 0, 0, 0 } }};
get_cpuid(0, cpuinf[0].regs);
if(cpuinf[0].regs[0] == 0)
ERR("Failed to get CPUID\n");
else
{
unsigned int maxfunc = cpuinf[0].regs[0];
unsigned int maxextfunc;
get_cpuid(0x80000000, cpuinf[0].regs);
maxextfunc = cpuinf[0].regs[0];
TRACE("Detected max CPUID function: 0x%x (ext. 0x%x)\n", maxfunc, maxextfunc);
TRACE("Vendor ID: \"%.4s%.4s%.4s\"\n", cpuinf[0].str+4, cpuinf[0].str+12, cpuinf[0].str+8);
if(maxextfunc >= 0x80000004)
{
get_cpuid(0x80000002, cpuinf[0].regs);
get_cpuid(0x80000003, cpuinf[1].regs);
get_cpuid(0x80000004, cpuinf[2].regs);
TRACE("Name: \"%.16s%.16s%.16s\"\n", cpuinf[0].str, cpuinf[1].str, cpuinf[2].str);
}
if(maxfunc >= 1)
{
get_cpuid(1, cpuinf[0].regs);
if((cpuinf[0].regs[3]&(1<<25)))
caps |= CPU_CAP_SSE;
if((caps&CPU_CAP_SSE) && (cpuinf[0].regs[3]&(1<<26)))
caps |= CPU_CAP_SSE2;
if((caps&CPU_CAP_SSE2) && (cpuinf[0].regs[2]&(1<<0)))
caps |= CPU_CAP_SSE3;
if((caps&CPU_CAP_SSE3) && (cpuinf[0].regs[2]&(1<<19)))
caps |= CPU_CAP_SSE4_1;
}
}
#else
/* Assume support for whatever's supported if we can't check for it */
#if defined(HAVE_SSE4_1)
#warning "Assuming SSE 4.1 run-time support!"
caps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3 | CPU_CAP_SSE4_1;
#elif defined(HAVE_SSE3)
#warning "Assuming SSE 3 run-time support!"
caps |= CPU_CAP_SSE | CPU_CAP_SSE2 | CPU_CAP_SSE3;
#elif defined(HAVE_SSE2)
#warning "Assuming SSE 2 run-time support!"
caps |= CPU_CAP_SSE | CPU_CAP_SSE2;
#elif defined(HAVE_SSE)
#warning "Assuming SSE run-time support!"
caps |= CPU_CAP_SSE;
#endif
#endif
#ifdef HAVE_NEON
al::ifstream file{"/proc/cpuinfo"};
if(!file.is_open())
ERR("Failed to open /proc/cpuinfo, cannot check for NEON support\n");
else
{
std::string features;
auto getline = [](std::istream &f, std::string &output) -> bool
{
while(f.good() && f.peek() == '\n')
f.ignore();
return std::getline(f, output) && !output.empty();
};
while(getline(file, features))
{
if(features.compare(0, 10, "Features\t:", 10) == 0)
break;
}
file.close();
size_t extpos{9};
while((extpos=features.find("neon", extpos+1)) != std::string::npos)
{
if((extpos == 0 || std::isspace(features[extpos-1])) &&
(extpos+4 == features.length() || std::isspace(features[extpos+4])))
{
caps |= CPU_CAP_NEON;
break;
}
}
}
#endif
TRACE("Extensions:%s%s%s%s%s%s\n",
((capfilter&CPU_CAP_SSE) ? ((caps&CPU_CAP_SSE) ? " +SSE" : " -SSE") : ""),
((capfilter&CPU_CAP_SSE2) ? ((caps&CPU_CAP_SSE2) ? " +SSE2" : " -SSE2") : ""),
((capfilter&CPU_CAP_SSE3) ? ((caps&CPU_CAP_SSE3) ? " +SSE3" : " -SSE3") : ""),
((capfilter&CPU_CAP_SSE4_1) ? ((caps&CPU_CAP_SSE4_1) ? " +SSE4.1" : " -SSE4.1") : ""),
((capfilter&CPU_CAP_NEON) ? ((caps&CPU_CAP_NEON) ? " +NEON" : " -NEON") : ""),
((!capfilter) ? " -none-" : "")
);
CPUCapFlags = caps & capfilter;
}
FPUCtl::FPUCtl()
{
#if defined(HAVE_SSE_INTRINSICS)
this->sse_state = _mm_getcsr();
unsigned int sseState = this->sse_state;
sseState |= 0x8000; /* set flush-to-zero */
sseState |= 0x0040; /* set denormals-are-zero */
_mm_setcsr(sseState);
#elif defined(__GNUC__) && defined(HAVE_SSE)
if((CPUCapFlags&CPU_CAP_SSE))
{
__asm__ __volatile__("stmxcsr %0" : "=m" (*&this->sse_state));
unsigned int sseState = this->sse_state;
sseState |= 0x8000; /* set flush-to-zero */
if((CPUCapFlags&CPU_CAP_SSE2))
sseState |= 0x0040; /* set denormals-are-zero */
__asm__ __volatile__("ldmxcsr %0" : : "m" (*&sseState));
}
#endif
this->in_mode = true;
}
void FPUCtl::leave()
{
if(!this->in_mode) return;
#if defined(HAVE_SSE_INTRINSICS)
_mm_setcsr(this->sse_state);
#elif defined(__GNUC__) && defined(HAVE_SSE)
if((CPUCapFlags&CPU_CAP_SSE))
__asm__ __volatile__("ldmxcsr %0" : : "m" (*&this->sse_state));
#endif
this->in_mode = false;
}
#ifdef _WIN32
namespace al {
auto filebuf::underflow() -> int_type
{
if(mFile != INVALID_HANDLE_VALUE && gptr() == egptr())
{
// Read in the next chunk of data, and set the pointers on success
DWORD got{};
if(ReadFile(mFile, mBuffer.data(), static_cast<DWORD>(mBuffer.size()), &got, nullptr))
setg(mBuffer.data(), mBuffer.data(), mBuffer.data()+got);
}
if(gptr() == egptr())
return traits_type::eof();
return traits_type::to_int_type(*gptr());
}
auto filebuf::seekoff(off_type offset, std::ios_base::seekdir whence, std::ios_base::openmode mode) -> pos_type
{
if(mFile == INVALID_HANDLE_VALUE || (mode&std::ios_base::out) || !(mode&std::ios_base::in))
return traits_type::eof();
LARGE_INTEGER fpos{};
switch(whence)
{
case std::ios_base::beg:
fpos.QuadPart = offset;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_BEGIN))
return traits_type::eof();
break;
case std::ios_base::cur:
// If the offset remains in the current buffer range, just
// update the pointer.
if((offset >= 0 && offset < off_type(egptr()-gptr())) ||
(offset < 0 && -offset <= off_type(gptr()-eback())))
{
// Get the current file offset to report the correct read
// offset.
fpos.QuadPart = 0;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_CURRENT))
return traits_type::eof();
setg(eback(), gptr()+offset, egptr());
return fpos.QuadPart - off_type(egptr()-gptr());
}
// Need to offset for the file offset being at egptr() while
// the requested offset is relative to gptr().
offset -= off_type(egptr()-gptr());
fpos.QuadPart = offset;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_CURRENT))
return traits_type::eof();
break;
case std::ios_base::end:
fpos.QuadPart = offset;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_END))
return traits_type::eof();
break;
default:
return traits_type::eof();
}
setg(nullptr, nullptr, nullptr);
return fpos.QuadPart;
}
auto filebuf::seekpos(pos_type pos, std::ios_base::openmode mode) -> pos_type
{
// Simplified version of seekoff
if(mFile == INVALID_HANDLE_VALUE || (mode&std::ios_base::out) || !(mode&std::ios_base::in))
return traits_type::eof();
LARGE_INTEGER fpos{};
fpos.QuadPart = pos;
if(!SetFilePointerEx(mFile, fpos, &fpos, FILE_BEGIN))
return traits_type::eof();
setg(nullptr, nullptr, nullptr);
return fpos.QuadPart;
}
filebuf::~filebuf()
{
if(mFile != INVALID_HANDLE_VALUE)
CloseHandle(mFile);
mFile = INVALID_HANDLE_VALUE;
}
bool filebuf::open(const wchar_t *filename, std::ios_base::openmode mode)
{
if((mode&std::ios_base::out) || !(mode&std::ios_base::in))
return false;
HANDLE f{CreateFileW(filename, GENERIC_READ, FILE_SHARE_READ, nullptr, OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL, nullptr)};
if(f == INVALID_HANDLE_VALUE) return false;
if(mFile != INVALID_HANDLE_VALUE)
CloseHandle(mFile);
mFile = f;
setg(nullptr, nullptr, nullptr);
return true;
}
bool filebuf::open(const char *filename, std::ios_base::openmode mode)
{
std::wstring wname{utf8_to_wstr(filename)};
return open(wname.c_str(), mode);
}
ifstream::ifstream(const wchar_t *filename, std::ios_base::openmode mode)
: std::istream{nullptr}
{
init(&mStreamBuf);
// Set the failbit if the file failed to open.
if((mode&std::ios_base::out) || !mStreamBuf.open(filename, mode|std::ios_base::in))
clear(failbit);
}
ifstream::ifstream(const char *filename, std::ios_base::openmode mode)
: std::istream{nullptr}
{
init(&mStreamBuf);
// Set the failbit if the file failed to open.
if((mode&std::ios_base::out) || !mStreamBuf.open(filename, mode|std::ios_base::in))
clear(failbit);
}
/* This is only here to ensure the compiler doesn't define an implicit
* destructor, which it tries to automatically inline and subsequently complain
* it can't inline without excessive code growth.
*/
ifstream::~ifstream() { }
} // namespace al
const PathNamePair &GetProcBinary()
{
static PathNamePair ret;
if(!ret.fname.empty() || !ret.path.empty())
return ret;
al::vector<WCHAR> fullpath(256);
DWORD len;
while((len=GetModuleFileNameW(nullptr, fullpath.data(), static_cast<DWORD>(fullpath.size()))) == fullpath.size())
fullpath.resize(fullpath.size() << 1);
if(len == 0)
{
ERR("Failed to get process name: error %lu\n", GetLastError());
return ret;
}
fullpath.resize(len);
if(fullpath.back() != 0)
fullpath.push_back(0);
auto sep = std::find(fullpath.rbegin()+1, fullpath.rend(), '\\');
sep = std::find(fullpath.rbegin()+1, sep, '/');
if(sep != fullpath.rend())
{
*sep = 0;
ret.fname = wstr_to_utf8(&*sep + 1);
ret.path = wstr_to_utf8(fullpath.data());
}
else
ret.fname = wstr_to_utf8(fullpath.data());
TRACE("Got binary: %s, %s\n", ret.path.c_str(), ret.fname.c_str());
return ret;
}
void al_print(FILE *logfile, const char *fmt, ...)
{
al::vector<char> dynmsg;
char stcmsg[256];
char *str{stcmsg};
va_list args, args2;
va_start(args, fmt);
va_copy(args2, args);
int msglen{std::vsnprintf(str, sizeof(stcmsg), fmt, args)};
if UNLIKELY(msglen >= 0 && static_cast<size_t>(msglen) >= sizeof(stcmsg))
{
dynmsg.resize(static_cast<size_t>(msglen) + 1u);
str = dynmsg.data();
msglen = std::vsnprintf(str, dynmsg.size(), fmt, args2);
}
va_end(args2);
va_end(args);
std::wstring wstr{utf8_to_wstr(str)};
fprintf(logfile, "%ls", wstr.c_str());
fflush(logfile);
}
static inline int is_slash(int c)
{ return (c == '\\' || c == '/'); }
static void DirectorySearch(const char *path, const char *ext, al::vector<std::string> *const results)
{
std::string pathstr{path};
pathstr += "\\*";
pathstr += ext;
TRACE("Searching %s\n", pathstr.c_str());
std::wstring wpath{utf8_to_wstr(pathstr.c_str())};
WIN32_FIND_DATAW fdata;
HANDLE hdl{FindFirstFileW(wpath.c_str(), &fdata)};
if(hdl != INVALID_HANDLE_VALUE)
{
size_t base = results->size();
do {
results->emplace_back();
std::string &str = results->back();
str = path;
str += '\\';
str += wstr_to_utf8(fdata.cFileName);
TRACE(" got %s\n", str.c_str());
} while(FindNextFileW(hdl, &fdata));
FindClose(hdl);
std::sort(results->begin()+base, results->end());
}
}
al::vector<std::string> SearchDataFiles(const char *ext, const char *subdir)
{
static std::mutex search_lock;
std::lock_guard<std::mutex> _{search_lock};
/* If the path is absolute, use it directly. */
al::vector<std::string> results;
if(isalpha(subdir[0]) && subdir[1] == ':' && is_slash(subdir[2]))
{
std::string path{subdir};
std::replace(path.begin(), path.end(), '/', '\\');
DirectorySearch(path.c_str(), ext, &results);
return results;
}
if(subdir[0] == '\\' && subdir[1] == '\\' && subdir[2] == '?' && subdir[3] == '\\')
{
DirectorySearch(subdir, ext, &results);
return results;
}
std::string path;
/* Search the app-local directory. */
if(auto localpath = al::getenv(L"ALSOFT_LOCAL_PATH"))
{
path = wstr_to_utf8(localpath->c_str());
if(is_slash(path.back()))
path.pop_back();
}
else if(WCHAR *cwdbuf{_wgetcwd(nullptr, 0)})
{
path = wstr_to_utf8(cwdbuf);
if(is_slash(path.back()))
path.pop_back();
free(cwdbuf);
}
else
path = ".";
std::replace(path.begin(), path.end(), '/', '\\');
DirectorySearch(path.c_str(), ext, &results);
/* Search the local and global data dirs. */
static constexpr int ids[2]{ CSIDL_APPDATA, CSIDL_COMMON_APPDATA };
for(int id : ids)
{
WCHAR buffer[MAX_PATH];
if(SHGetSpecialFolderPathW(nullptr, buffer, id, FALSE) == FALSE)
continue;
path = wstr_to_utf8(buffer);
if(!is_slash(path.back()))
path += '\\';
path += subdir;
std::replace(path.begin(), path.end(), '/', '\\');
DirectorySearch(path.c_str(), ext, &results);
}
return results;
}
void SetRTPriority(void)
{
bool failed = false;
if(RTPrioLevel > 0)
failed = !SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
if(failed) ERR("Failed to set priority level for thread\n");
}
#else
#if defined(HAVE_PTHREAD_SETSCHEDPARAM) && !defined(__OpenBSD__)
#include <pthread.h>
#include <sched.h>
#endif
const PathNamePair &GetProcBinary()
{
static PathNamePair ret;
if(!ret.fname.empty() || !ret.path.empty())
return ret;
al::vector<char> pathname;
#ifdef __FreeBSD__
size_t pathlen;
int mib[4] = { CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1 };
if(sysctl(mib, 4, nullptr, &pathlen, nullptr, 0) == -1)
WARN("Failed to sysctl kern.proc.pathname: %s\n", strerror(errno));
else
{
pathname.resize(pathlen + 1);
sysctl(mib, 4, pathname.data(), &pathlen, nullptr, 0);
pathname.resize(pathlen);
}
#endif
#ifdef HAVE_PROC_PIDPATH
if(pathname.empty())
{
char procpath[PROC_PIDPATHINFO_MAXSIZE]{};
const pid_t pid{getpid()};
if(proc_pidpath(pid, procpath, sizeof(procpath)) < 1)
ERR("proc_pidpath(%d, ...) failed: %s\n", pid, strerror(errno));
else
pathname.insert(pathname.end(), procpath, procpath+strlen(procpath));
}
#endif
if(pathname.empty())
{
pathname.resize(256);
const char *selfname{"/proc/self/exe"};
ssize_t len{readlink(selfname, pathname.data(), pathname.size())};
if(len == -1 && errno == ENOENT)
{
selfname = "/proc/self/file";
len = readlink(selfname, pathname.data(), pathname.size());
}
if(len == -1 && errno == ENOENT)
{
selfname = "/proc/curproc/exe";
len = readlink(selfname, pathname.data(), pathname.size());
}
if(len == -1 && errno == ENOENT)
{
selfname = "/proc/curproc/file";
len = readlink(selfname, pathname.data(), pathname.size());
}
while(len > 0 && static_cast<size_t>(len) == pathname.size())
{
pathname.resize(pathname.size() << 1);
len = readlink(selfname, pathname.data(), pathname.size());
}
if(len <= 0)
{
WARN("Failed to readlink %s: %s\n", selfname, strerror(errno));
return ret;
}
pathname.resize(static_cast<size_t>(len));
}
while(!pathname.empty() && pathname.back() == 0)
pathname.pop_back();
auto sep = std::find(pathname.crbegin(), pathname.crend(), '/');
if(sep != pathname.crend())
{
ret.path = std::string(pathname.cbegin(), sep.base()-1);
ret.fname = std::string(sep.base(), pathname.cend());
}
else
ret.fname = std::string(pathname.cbegin(), pathname.cend());
TRACE("Got binary: %s, %s\n", ret.path.c_str(), ret.fname.c_str());
return ret;
}
void al_print(FILE *logfile, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
vfprintf(logfile, fmt, ap);
va_end(ap);
fflush(logfile);
}
static void DirectorySearch(const char *path, const char *ext, al::vector<std::string> *const results)
{
TRACE("Searching %s for *%s\n", path, ext);
DIR *dir{opendir(path)};
if(dir != nullptr)
{
auto base = results->cend() - results->cbegin();
const size_t extlen{strlen(ext)};
struct dirent *dirent;
while((dirent=readdir(dir)) != nullptr)
{
if(strcmp(dirent->d_name, ".") == 0 || strcmp(dirent->d_name, "..") == 0)
continue;
size_t len{strlen(dirent->d_name)};
if(len <= extlen) continue;
if(strcasecmp(dirent->d_name+len-extlen, ext) != 0)
continue;
results->emplace_back();
std::string &str = results->back();
str = path;
if(str.back() != '/')
str.push_back('/');
str += dirent->d_name;
TRACE(" got %s\n", str.c_str());
}
closedir(dir);
std::sort(results->begin()+base, results->end());
}
}
al::vector<std::string> SearchDataFiles(const char *ext, const char *subdir)
{
static std::mutex search_lock;
std::lock_guard<std::mutex> _{search_lock};
al::vector<std::string> results;
if(subdir[0] == '/')
{
DirectorySearch(subdir, ext, &results);
return results;
}
/* Search the app-local directory. */
if(auto localpath = al::getenv("ALSOFT_LOCAL_PATH"))
DirectorySearch(localpath->c_str(), ext, &results);
else
{
al::vector<char> cwdbuf(256);
while(!getcwd(cwdbuf.data(), cwdbuf.size()))
{
if(errno != ERANGE)
{
cwdbuf.clear();
break;
}
cwdbuf.resize(cwdbuf.size() << 1);
}
if(cwdbuf.empty())
DirectorySearch(".", ext, &results);
else
{
DirectorySearch(cwdbuf.data(), ext, &results);
cwdbuf.clear();
}
}
// Search local data dir
if(auto datapath = al::getenv("XDG_DATA_HOME"))
{
std::string &path = *datapath;
if(path.back() != '/')
path += '/';
path += subdir;
DirectorySearch(path.c_str(), ext, &results);
}
else if(auto homepath = al::getenv("HOME"))
{
std::string &path = *homepath;
if(path.back() == '/')
path.pop_back();
path += "/.local/share/";
path += subdir;
DirectorySearch(path.c_str(), ext, &results);
}
// Search global data dirs
std::string datadirs{al::getenv("XDG_DATA_DIRS").value_or("/usr/local/share/:/usr/share/")};
size_t curpos{0u};
while(curpos < datadirs.size())
{
size_t nextpos{datadirs.find(':', curpos)};
std::string path{(nextpos != std::string::npos) ?
datadirs.substr(curpos, nextpos++ - curpos) : datadirs.substr(curpos)};
curpos = nextpos;
if(path.empty()) continue;
if(path.back() != '/')
path += '/';
path += subdir;
DirectorySearch(path.c_str(), ext, &results);
}
return results;
}
void SetRTPriority()
{
bool failed = false;
#if defined(HAVE_PTHREAD_SETSCHEDPARAM) && !defined(__OpenBSD__)
if(RTPrioLevel > 0)
{
struct sched_param param;
/* Use the minimum real-time priority possible for now (on Linux this
* should be 1 for SCHED_RR) */
param.sched_priority = sched_get_priority_min(SCHED_RR);
failed = !!pthread_setschedparam(pthread_self(), SCHED_RR, &param);
}
#else
/* Real-time priority not available */
failed = (RTPrioLevel>0);
#endif
if(failed)
ERR("Failed to set priority level for thread\n");
}
#endif
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