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3bd7f027f8
This dramatically reduces the number of needed malloc calls. Unfortunately I had to add the implementation of SmallVectorBase::grow_pod to the runtime, as we don't link LLVM. This is a bad hack, but better than re-inventing a new SmallVector implementation. SR-10028 rdar://problem/48575729
73 lines
2.8 KiB
C++
73 lines
2.8 KiB
C++
//===--- LLVMSupport.cpp - Swift Language ABI Metadata Support ------------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/SmallVector.h"
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// ADT uses report_bad_alloc_error to report an error when it can't allocate
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// elements for a data structure. The swift runtime uses ADT without linking
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// against libSupport, so here we provide a stub to make sure we don't fail
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// to link.
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#if defined(swiftCore_EXPORTS)
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namespace llvm {
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#if defined(_WIN32)
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extern void report_bad_alloc_error(const char *Reason, bool GenCrashDiag);
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void _report_bad_alloc_error(const char *Reason, bool GenCrashDiag) {}
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#if defined(_WIN64)
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#pragma comment(linker, "/alternatename:?report_bad_alloc_error@llvm@@YAXPEBD_N@Z=?_report_bad_alloc_error@llvm@@YAXPEBD_N@Z")
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#else
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#pragma comment(linker, "/alternatename:?report_bad_alloc_error@llvm@@YAXPBD_N@Z=?_report_bad_alloc_error@llvm@@YAXPBD_N@Z")
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#endif
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#else
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void __attribute__((__weak__, __visibility__("hidden")))
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report_bad_alloc_error(const char *Reason, bool GenCrashDiag) {}
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#endif
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// The same for SmallVector: provide the grow_pod implementation (the only
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// SmallVector function which is not inlined) as we don't link LLVM.
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// TODO: This is a hack. This implementaiton is copied from LLVM and has to stay
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// in sync with it.
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/// grow_pod - This is an implementation of the grow() method which only works
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/// on POD-like datatypes and is out of line to reduce code duplication.
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void
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#if !defined(_WIN32)
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__attribute__((__weak__, __visibility__("hidden")))
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#endif
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llvm::SmallVectorBase::grow_pod(void *FirstEl, size_t MinCapacity,
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size_t TSize) {
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// Ensure we can fit the new capacity in 32 bits.
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if (MinCapacity > UINT32_MAX)
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report_bad_alloc_error("SmallVector capacity overflow during allocation");
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size_t NewCapacity = 2 * capacity() + 1; // Always grow.
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NewCapacity =
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std::min(std::max(NewCapacity, MinCapacity), size_t(UINT32_MAX));
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void *NewElts;
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if (BeginX == FirstEl) {
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NewElts = safe_malloc(NewCapacity * TSize);
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// Copy the elements over. No need to run dtors on PODs.
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memcpy(NewElts, this->BeginX, size() * TSize);
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} else {
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// If this wasn't grown from the inline copy, grow the allocated space.
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NewElts = safe_realloc(this->BeginX, NewCapacity * TSize);
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}
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this->BeginX = NewElts;
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this->Capacity = NewCapacity;
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}
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} // end namespace llvm
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#endif // defined(swiftCore_EXPORTS)
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