54f37133b7
Mostly mechanical changes in preparation of extracting the Flang-RT "subproject" in #110217. This PR intends to only move pre-existing files to the new folder structure, with no behavioral change. Common files (headers, testing, cmake) shared by Flang-RT and Flang remain in `flang/`. Some cosmetic changes and files paths were necessary: * Relative paths to the new path for the source files and `add_subdirectory`. * Add the new location's include directory to `include_directories` * The unittest/Evaluate directory has unitests for flang-rt and Flang. A new `CMakeLists.txt` was introduced for the flang-rt tests. * Change the `#include` paths relative to the include directive * clang-format on the `#include` directives * Since the paths are part if the copyright header and include guards, a script was used to canonicalize those * `test/Runtime` and runtime tests in `test/Driver` are moved, but the lit.cfg.py mechanism to execute the will only be added in #110217.
104 lines
3.1 KiB
C++
104 lines
3.1 KiB
C++
//===-- lib/runtime/unit-map.h ----------------------------------*- C++ -*-===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// Maps Fortran unit numbers to their ExternalFileUnit instances.
|
|
// A simple hash table with forward-linked chains per bucket.
|
|
|
|
#ifndef FLANG_RT_RUNTIME_UNIT_MAP_H_
|
|
#define FLANG_RT_RUNTIME_UNIT_MAP_H_
|
|
|
|
#include "unit.h"
|
|
#include "flang-rt/runtime/lock.h"
|
|
#include "flang-rt/runtime/memory.h"
|
|
#include "flang/Common/fast-int-set.h"
|
|
#include <cstdint>
|
|
#include <cstdlib>
|
|
|
|
namespace Fortran::runtime::io {
|
|
|
|
class UnitMap {
|
|
public:
|
|
ExternalFileUnit *LookUp(int n) {
|
|
CriticalSection critical{lock_};
|
|
return Find(n);
|
|
}
|
|
|
|
ExternalFileUnit *LookUpOrCreate(
|
|
int n, const Terminator &terminator, bool &wasExtant) {
|
|
CriticalSection critical{lock_};
|
|
if (auto *p{Find(n)}) {
|
|
wasExtant = true;
|
|
return p;
|
|
} else {
|
|
wasExtant = false;
|
|
return n >= 0 ? &Create(n, terminator) : nullptr;
|
|
}
|
|
}
|
|
|
|
// Unit look-up by name is needed for INQUIRE(FILE="...")
|
|
ExternalFileUnit *LookUp(const char *path, std::size_t pathLen) {
|
|
CriticalSection critical{lock_};
|
|
return Find(path, pathLen);
|
|
}
|
|
|
|
ExternalFileUnit &NewUnit(const Terminator &);
|
|
|
|
// To prevent races, the unit is removed from the map if it exists,
|
|
// and put on the closing_ list until DestroyClosed() is called.
|
|
ExternalFileUnit *LookUpForClose(int);
|
|
|
|
void DestroyClosed(ExternalFileUnit &);
|
|
void CloseAll(IoErrorHandler &);
|
|
void FlushAll(IoErrorHandler &);
|
|
|
|
private:
|
|
struct Chain {
|
|
explicit Chain(int n) : unit{n} {}
|
|
ExternalFileUnit unit;
|
|
OwningPtr<Chain> next{nullptr};
|
|
};
|
|
|
|
static constexpr int buckets_{1031}; // must be prime
|
|
|
|
// The pool of recyclable new unit numbers uses the range that
|
|
// works even with INTEGER(kind=1). 0 and -1 are never used.
|
|
static constexpr int maxNewUnits_{129}; // [ -128 .. 0 ]
|
|
|
|
int Hash(int n) { return std::abs(n) % buckets_; }
|
|
|
|
void Initialize();
|
|
|
|
ExternalFileUnit *Find(int n) {
|
|
Chain *previous{nullptr};
|
|
int hash{Hash(n)};
|
|
for (Chain *p{bucket_[hash].get()}; p; previous = p, p = p->next.get()) {
|
|
if (p->unit.unitNumber() == n) {
|
|
if (previous) {
|
|
// Move found unit to front of chain for quicker lookup next time
|
|
previous->next.swap(p->next); // now p->next.get() == p
|
|
bucket_[hash].swap(p->next); // now bucket_[hash].get() == p
|
|
}
|
|
return &p->unit;
|
|
}
|
|
}
|
|
return nullptr;
|
|
}
|
|
ExternalFileUnit *Find(const char *path, std::size_t pathLen);
|
|
|
|
ExternalFileUnit &Create(int, const Terminator &);
|
|
|
|
Lock lock_;
|
|
bool isInitialized_{false};
|
|
OwningPtr<Chain> bucket_[buckets_]{}; // all owned by *this
|
|
OwningPtr<Chain> closing_{nullptr}; // units during CLOSE statement
|
|
common::FastIntSet<maxNewUnits_> freeNewUnits_;
|
|
int emergencyNewUnit_{maxNewUnits_}; // not recycled
|
|
};
|
|
} // namespace Fortran::runtime::io
|
|
#endif // FLANG_RT_RUNTIME_UNIT_MAP_H_
|