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#include <c10/core/Device.h>
#include <c10/macros/Macros.h>
#include <c10/util/Exception.h>
#include <algorithm>
#include <array>
#include <cctype>
#include <exception>
#include <ostream>
#include <string>
#include <tuple>
#include <vector>
namespace c10 {
namespace {
DeviceType parse_type(const std::string& device_string) {
static const std::array<
std::pair<const char*, DeviceType>,
static_cast<size_t>(DeviceType::COMPILE_TIME_MAX_DEVICE_TYPES)>
types = {{
{"cpu", DeviceType::CPU},
{"cuda", DeviceType::CUDA},
{"ipu", DeviceType::IPU},
{"xpu", DeviceType::XPU},
{"mkldnn", DeviceType::MKLDNN},
{"opengl", DeviceType::OPENGL},
{"opencl", DeviceType::OPENCL},
{"ideep", DeviceType::IDEEP},
{"hip", DeviceType::HIP},
{"ve", DeviceType::VE},
{"fpga", DeviceType::FPGA},
{"ort", DeviceType::ORT},
{"xla", DeviceType::XLA},
{"lazy", DeviceType::Lazy},
{"vulkan", DeviceType::Vulkan},
{"mps", DeviceType::MPS},
{"meta", DeviceType::Meta},
{"hpu", DeviceType::HPU},
{"privateuseone", DeviceType::PrivateUse1},
}};
auto device = std::find_if(
types.begin(),
types.end(),
[&device_string](const std::pair<const char*, DeviceType>& p) {
return p.first && p.first == device_string;
});
if (device != types.end()) {
return device->second;
}
std::vector<const char*> device_names;
for (const auto& it : types) {
if (it.first) {
device_names.push_back(it.first);
}
}
TORCH_CHECK(
false,
"Expected one of ",
c10::Join(", ", device_names),
" device type at start of device string: ",
device_string);
}
enum DeviceStringParsingState { START, INDEX_START, INDEX_REST, ERROR };
} // namespace
Device::Device(const std::string& device_string) : Device(Type::CPU) {
TORCH_CHECK(!device_string.empty(), "Device string must not be empty");
std::string device_name, device_index_str;
DeviceStringParsingState pstate = DeviceStringParsingState::START;
// The code below tries to match the string in the variable
// device_string against the regular expression:
// ([a-zA-Z_]+)(?::([1-9]\\d*|0))?
for (size_t i = 0;
pstate != DeviceStringParsingState::ERROR && i < device_string.size();
++i) {
const char ch = device_string.at(i);
switch (pstate) {
case DeviceStringParsingState::START:
if (ch != ':') {
if (isalpha(ch) || ch == '_') {
device_name.push_back(ch);
} else {
pstate = DeviceStringParsingState::ERROR;
}
} else {
pstate = DeviceStringParsingState::INDEX_START;
}
break;
case DeviceStringParsingState::INDEX_START:
if (isdigit(ch)) {
device_index_str.push_back(ch);
pstate = DeviceStringParsingState::INDEX_REST;
} else {
pstate = DeviceStringParsingState::ERROR;
}
break;
case DeviceStringParsingState::INDEX_REST:
if (device_index_str.at(0) == '0') {
pstate = DeviceStringParsingState::ERROR;
break;
}
if (isdigit(ch)) {
device_index_str.push_back(ch);
} else {
pstate = DeviceStringParsingState::ERROR;
}
break;
case DeviceStringParsingState::ERROR:
// Execution won't reach here.
break;
}
}
const bool has_error = device_name.empty() ||
pstate == DeviceStringParsingState::ERROR ||
(pstate == DeviceStringParsingState::INDEX_START &&
device_index_str.empty());
TORCH_CHECK(!has_error, "Invalid device string: '", device_string, "'");
try {
if (!device_index_str.empty()) {
index_ = c10::stoi(device_index_str);
}
} catch (const std::exception&) {
TORCH_CHECK(
false,
"Could not parse device index '",
device_index_str,
"' in device string '",
device_string,
"'");
}
type_ = parse_type(device_name);
validate();
}
std::string Device::str() const {
std::string str = DeviceTypeName(type(), /* lower case */ true);
if (has_index()) {
str.push_back(':');
str.append(to_string(index()));
}
return str;
}
std::ostream& operator<<(std::ostream& stream, const Device& device) {
stream << device.str();
return stream;
}
} // namespace c10
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