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//===--- GlobalObjects.cpp - Statically-initialized objects ---------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
//
// Objects that are allocated at global scope instead of on the heap,
// and statically initialized to avoid synchronization costs, are
// defined here.
//
//===----------------------------------------------------------------------===//
#include "../SwiftShims/GlobalObjects.h"
#include "../SwiftShims/LibcShims.h"
#include "swift/Runtime/Metadata.h"
#include "swift/Runtime/Debug.h"
#include <stdlib.h>
namespace swift {
// FIXME(ABI)#76 : does this declaration need SWIFT_RUNTIME_STDLIB_INTERFACE?
// _direct type metadata for Swift._EmptyArrayStorage
SWIFT_RUNTIME_STDLIB_INTERFACE
ClassMetadata CLASS_METADATA_SYM(s18_EmptyArrayStorage);
// _direct type metadata for Swift._RawNativeDictionaryStorage
SWIFT_RUNTIME_STDLIB_INTERFACE
ClassMetadata CLASS_METADATA_SYM(s27_RawNativeDictionaryStorage);
// _direct type metadata for Swift._RawNativeSetStorage
SWIFT_RUNTIME_STDLIB_INTERFACE
ClassMetadata CLASS_METADATA_SYM(s20_RawNativeSetStorage);
} // namespace swift
SWIFT_RUNTIME_STDLIB_INTERFACE
swift::_SwiftEmptyArrayStorage swift::_swiftEmptyArrayStorage = {
// HeapObject header;
{
&swift::CLASS_METADATA_SYM(s18_EmptyArrayStorage), // isa pointer
},
// _SwiftArrayBodyStorage body;
{
0, // int count;
1 // unsigned int _capacityAndFlags; 1 means elementTypeIsBridgedVerbatim
}
};
SWIFT_RUNTIME_STDLIB_INTERFACE
swift::_SwiftEmptyDictionaryStorage swift::_swiftEmptyDictionaryStorage = {
// HeapObject header;
{
&swift::CLASS_METADATA_SYM(s27_RawNativeDictionaryStorage), // isa pointer
},
// _SwiftDictionaryBodyStorage body;
{
// We set the capacity to 1 so that there's an empty hole to search.
// Any insertion will lead to a real storage being allocated, because
// Dictionary guarantees there's always another empty hole after insertion.
1, // int capacity;
0, // int count;
// _SwiftUnsafeBitMap initializedEntries
{
&swift::_swiftEmptyDictionaryStorage.entries, // unsigned int* values;
1 // int bitCount; (1 so there's something for iterators to read)
},
(void*)1, // void* keys; (non-null garbage)
(void*)1 // void* values; (non-null garbage)
},
0 // int entries; (zero'd bits)
};
SWIFT_RUNTIME_STDLIB_INTERFACE
swift::_SwiftEmptySetStorage swift::_swiftEmptySetStorage = {
// HeapObject header;
{
&swift::CLASS_METADATA_SYM(s20_RawNativeSetStorage), // isa pointer
},
// _SwiftDictionaryBodyStorage body;
{
// We set the capacity to 1 so that there's an empty hole to search.
// Any insertion will lead to a real storage being allocated, because
// Dictionary guarantees there's always another empty hole after insertion.
1, // int capacity;
0, // int count;
// _SwiftUnsafeBitMap initializedEntries
{
&swift::_swiftEmptySetStorage.entries, // unsigned int* values;
1 // int bitCount; (1 so there's something for iterators to read)
},
(void*)1 // void* keys; (non-null garbage)
},
0 // int entries; (zero'd bits)
};
static swift::_SwiftHashingParameters initializeHashingParameters() {
// Setting the environment variable SWIFT_DETERMINISTIC_HASHING to "1"
// disables randomized hash seeding. This is useful in cases we need to ensure
// results are repeatable, e.g., in certain test environments. (Note that
// even if the seed override is enabled, hash values aren't guaranteed to
// remain stable across even minor stdlib releases.)
auto determinism = getenv("SWIFT_DETERMINISTIC_HASHING");
if (determinism && 0 == strcmp(determinism, "1")) {
return { 0, 0, true };
}
__swift_uint64_t seed0 = 0, seed1 = 0;
swift::_stdlib_random(&seed0, sizeof(seed0));
swift::_stdlib_random(&seed1, sizeof(seed1));
return { seed0, seed1, false };
}
SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_BEGIN
swift::_SwiftHashingParameters swift::_swift_stdlib_Hashing_parameters =
initializeHashingParameters();
SWIFT_ALLOWED_RUNTIME_GLOBAL_CTOR_END
SWIFT_RUNTIME_STDLIB_INTERFACE
void swift::_swift_instantiateInertHeapObject(void *address,
const HeapMetadata *metadata) {
::new (address) HeapObject{metadata};
}
namespace llvm { namespace hashing { namespace detail {
// An extern variable expected by LLVM's hashing templates. We don't link any
// LLVM libs into the runtime, so define it as a weak symbol.
//
// Systems that compile this code into a dynamic library will do so with
// hidden visibility, making this all internal to the dynamic library.
// Systems that statically link the Swift runtime into applications (e.g. on
// Linux) need this to handle the case when the app already uses LLVM.
size_t LLVM_ATTRIBUTE_WEAK fixed_seed_override = 0;
} // namespace detail
} // namespace hashing
} // namespace llvm