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//===-- runtime/random.cpp ------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// Implements the intrinsic subroutines RANDOM_INIT, RANDOM_NUMBER, and
// RANDOM_SEED.
#include "flang/Runtime/random.h"
#include "lock.h"
#include "random-templates.h"
#include "terminator.h"
#include "flang/Common/float128.h"
#include "flang/Common/leading-zero-bit-count.h"
#include "flang/Common/uint128.h"
#include "flang/Runtime/cpp-type.h"
#include "flang/Runtime/descriptor.h"
#include <cmath>
#include <cstdint>
#include <limits>
#include <memory>
#include <time.h>
namespace Fortran::runtime::random {
Lock lock;
Generator generator;
Fortran::common::optional<GeneratedWord> nextValue;
extern "C" {
void RTNAME(RandomInit)(bool repeatable, bool /*image_distinct*/) {
// TODO: multiple images and image_distinct: add image number
{
CriticalSection critical{lock};
if (repeatable) {
generator.seed(0);
} else {
#ifdef CLOCK_REALTIME
timespec ts;
clock_gettime(CLOCK_REALTIME, &ts);
generator.seed(ts.tv_sec ^ ts.tv_nsec);
#else
generator.seed(time(nullptr));
#endif
}
}
}
void RTNAME(RandomNumber)(
const Descriptor &harvest, const char *source, int line) {
Terminator terminator{source, line};
auto typeCode{harvest.type().GetCategoryAndKind()};
RUNTIME_CHECK(terminator,
typeCode &&
(typeCode->first == TypeCategory::Real ||
typeCode->first == TypeCategory::Unsigned));
int kind{typeCode->second};
if (typeCode->first == TypeCategory::Real) {
switch (kind) {
// TODO: REAL (2 & 3)
case 4:
GenerateReal<CppTypeFor<TypeCategory::Real, 4>, 24>(harvest);
return;
case 8:
GenerateReal<CppTypeFor<TypeCategory::Real, 8>, 53>(harvest);
return;
case 10:
if constexpr (HasCppTypeFor<TypeCategory::Real, 10>) {
#if HAS_FLOAT80
GenerateReal<CppTypeFor<TypeCategory::Real, 10>, 64>(harvest);
return;
#endif
}
break;
}
terminator.Crash(
"not yet implemented: intrinsic: REAL(KIND=%d) in RANDOM_NUMBER", kind);
} else if (typeCode->first == TypeCategory::Unsigned) {
switch (kind) {
case 1:
GenerateUnsigned<CppTypeFor<TypeCategory::Unsigned, 1>>(harvest);
return;
case 2:
GenerateUnsigned<CppTypeFor<TypeCategory::Unsigned, 2>>(harvest);
return;
case 4:
GenerateUnsigned<CppTypeFor<TypeCategory::Unsigned, 4>>(harvest);
return;
case 8:
GenerateUnsigned<CppTypeFor<TypeCategory::Unsigned, 8>>(harvest);
return;
#ifdef __SIZEOF_INT128__
case 16:
if constexpr (HasCppTypeFor<TypeCategory::Unsigned, 16>) {
GenerateUnsigned<CppTypeFor<TypeCategory::Unsigned, 16>>(harvest);
return;
}
break;
#endif
}
terminator.Crash(
"not yet implemented: intrinsic: UNSIGNED(KIND=%d) in RANDOM_NUMBER",
kind);
}
}
void RTNAME(RandomSeedSize)(
const Descriptor *size, const char *source, int line) {
if (!size || !size->raw().base_addr) {
RTNAME(RandomSeedDefaultPut)();
return;
}
Terminator terminator{source, line};
auto typeCode{size->type().GetCategoryAndKind()};
RUNTIME_CHECK(terminator,
size->rank() == 0 && typeCode &&
typeCode->first == TypeCategory::Integer);
int sizeArg{typeCode->second};
switch (sizeArg) {
case 4:
*size->OffsetElement<CppTypeFor<TypeCategory::Integer, 4>>() = 1;
break;
case 8:
*size->OffsetElement<CppTypeFor<TypeCategory::Integer, 8>>() = 1;
break;
default:
terminator.Crash(
"not yet implemented: intrinsic: RANDOM_SEED(SIZE=): size %d\n",
sizeArg);
}
}
void RTNAME(RandomSeedPut)(
const Descriptor *put, const char *source, int line) {
if (!put || !put->raw().base_addr) {
RTNAME(RandomSeedDefaultPut)();
return;
}
Terminator terminator{source, line};
auto typeCode{put->type().GetCategoryAndKind()};
RUNTIME_CHECK(terminator,
put->rank() == 1 && typeCode &&
typeCode->first == TypeCategory::Integer &&
put->GetDimension(0).Extent() >= 1);
int putArg{typeCode->second};
GeneratedWord seed;
switch (putArg) {
case 4:
seed = *put->OffsetElement<CppTypeFor<TypeCategory::Integer, 4>>();
break;
case 8:
seed = *put->OffsetElement<CppTypeFor<TypeCategory::Integer, 8>>();
break;
default:
terminator.Crash(
"not yet implemented: intrinsic: RANDOM_SEED(PUT=): put %d\n", putArg);
}
{
CriticalSection critical{lock};
generator.seed(seed);
nextValue = seed;
}
}
void RTNAME(RandomSeedDefaultPut)() {
// TODO: should this be time &/or image dependent?
{
CriticalSection critical{lock};
generator.seed(0);
}
}
void RTNAME(RandomSeedGet)(
const Descriptor *get, const char *source, int line) {
if (!get || !get->raw().base_addr) {
RTNAME(RandomSeedDefaultPut)();
return;
}
Terminator terminator{source, line};
auto typeCode{get->type().GetCategoryAndKind()};
RUNTIME_CHECK(terminator,
get->rank() == 1 && typeCode &&
typeCode->first == TypeCategory::Integer &&
get->GetDimension(0).Extent() >= 1);
int getArg{typeCode->second};
GeneratedWord seed;
{
CriticalSection critical{lock};
seed = GetNextValue();
nextValue = seed;
}
switch (getArg) {
case 4:
*get->OffsetElement<CppTypeFor<TypeCategory::Integer, 4>>() = seed;
break;
case 8:
*get->OffsetElement<CppTypeFor<TypeCategory::Integer, 8>>() = seed;
break;
default:
terminator.Crash(
"not yet implemented: intrinsic: RANDOM_SEED(GET=): get %d\n", getArg);
}
}
void RTNAME(RandomSeed)(const Descriptor *size, const Descriptor *put,
const Descriptor *get, const char *source, int line) {
bool sizePresent = size && size->raw().base_addr;
bool putPresent = put && put->raw().base_addr;
bool getPresent = get && get->raw().base_addr;
if (sizePresent + putPresent + getPresent > 1)
Terminator{source, line}.Crash(
"RANDOM_SEED must have either 1 or no arguments");
if (sizePresent)
RTNAME(RandomSeedSize)(size, source, line);
else if (putPresent)
RTNAME(RandomSeedPut)(put, source, line);
else if (getPresent)
RTNAME(RandomSeedGet)(get, source, line);
else
RTNAME(RandomSeedDefaultPut)();
}
} // extern "C"
} // namespace Fortran::runtime::random
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