2006-10-28 00:16:16 +08:00
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//===-- Support/FoldingSet.cpp - Uniquing Hash Set --------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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2007-12-30 04:36:04 +08:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2006-10-28 00:16:16 +08:00
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements a hash set that can be used to remove duplication of
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2012-11-17 02:58:23 +08:00
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// nodes in a graph.
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2006-10-28 00:16:16 +08:00
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/FoldingSet.h"
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2012-03-02 07:18:44 +08:00
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#include "llvm/ADT/Hashing.h"
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2010-03-19 00:16:38 +08:00
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#include "llvm/Support/Allocator.h"
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2009-07-12 04:10:48 +08:00
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#include "llvm/Support/ErrorHandling.h"
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2010-11-30 02:16:10 +08:00
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#include "llvm/Support/Host.h"
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2012-12-04 00:50:05 +08:00
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#include "llvm/Support/MathExtras.h"
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2006-11-03 09:38:14 +08:00
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#include <cassert>
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2008-02-20 19:08:44 +08:00
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#include <cstring>
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2006-10-28 00:16:16 +08:00
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using namespace llvm;
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2010-08-16 23:30:39 +08:00
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//===----------------------------------------------------------------------===//
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// FoldingSetNodeIDRef Implementation
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/// ComputeHash - Compute a strong hash value for this FoldingSetNodeIDRef,
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2017-06-13 04:52:53 +08:00
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/// used to lookup the node in the FoldingSetBase.
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2010-08-16 23:30:39 +08:00
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unsigned FoldingSetNodeIDRef::ComputeHash() const {
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2012-03-02 07:18:44 +08:00
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return static_cast<unsigned>(hash_combine_range(Data, Data+Size));
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2010-08-16 23:30:39 +08:00
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}
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bool FoldingSetNodeIDRef::operator==(FoldingSetNodeIDRef RHS) const {
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if (Size != RHS.Size) return false;
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return memcmp(Data, RHS.Data, Size*sizeof(*Data)) == 0;
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}
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2012-09-08 12:25:29 +08:00
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/// Used to compare the "ordering" of two nodes as defined by the
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/// profiled bits and their ordering defined by memcmp().
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bool FoldingSetNodeIDRef::operator<(FoldingSetNodeIDRef RHS) const {
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if (Size != RHS.Size)
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return Size < RHS.Size;
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return memcmp(Data, RHS.Data, Size*sizeof(*Data)) < 0;
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}
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2006-10-28 00:16:16 +08:00
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//===----------------------------------------------------------------------===//
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2008-01-19 12:22:50 +08:00
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// FoldingSetNodeID Implementation
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2006-10-28 00:16:16 +08:00
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2012-03-08 17:32:21 +08:00
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/// Add* - Add various data types to Bit data.
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///
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void FoldingSetNodeID::AddPointer(const void *Ptr) {
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// Note: this adds pointers to the hash using sizes and endianness that
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2015-04-07 00:21:12 +08:00
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// depend on the host. It doesn't matter, however, because hashing on
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// pointer values is inherently unstable. Nothing should depend on the
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2012-03-08 17:32:21 +08:00
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// ordering of nodes in the folding set.
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2016-10-17 01:49:09 +08:00
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static_assert(sizeof(uintptr_t) <= sizeof(unsigned long long),
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"unexpected pointer size");
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AddInteger(reinterpret_cast<uintptr_t>(Ptr));
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2012-03-08 17:32:21 +08:00
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}
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void FoldingSetNodeID::AddInteger(signed I) {
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Bits.push_back(I);
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}
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void FoldingSetNodeID::AddInteger(unsigned I) {
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Bits.push_back(I);
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}
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void FoldingSetNodeID::AddInteger(long I) {
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AddInteger((unsigned long)I);
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}
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void FoldingSetNodeID::AddInteger(unsigned long I) {
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if (sizeof(long) == sizeof(int))
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AddInteger(unsigned(I));
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else if (sizeof(long) == sizeof(long long)) {
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AddInteger((unsigned long long)I);
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} else {
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llvm_unreachable("unexpected sizeof(long)");
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}
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}
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void FoldingSetNodeID::AddInteger(long long I) {
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AddInteger((unsigned long long)I);
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}
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void FoldingSetNodeID::AddInteger(unsigned long long I) {
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AddInteger(unsigned(I));
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2016-10-17 01:49:09 +08:00
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AddInteger(unsigned(I >> 32));
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2012-03-08 17:32:21 +08:00
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}
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2009-09-22 11:34:53 +08:00
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void FoldingSetNodeID::AddString(StringRef String) {
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unsigned Size = String.size();
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2008-07-02 07:49:59 +08:00
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Bits.push_back(Size);
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if (!Size) return;
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unsigned Units = Size / 4;
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unsigned Pos = 0;
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2009-09-22 11:34:53 +08:00
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const unsigned *Base = (const unsigned*) String.data();
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2018-07-31 03:41:25 +08:00
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2008-07-02 07:49:59 +08:00
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// If the string is aligned do a bulk transfer.
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if (!((intptr_t)Base & 3)) {
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Bits.append(Base, Base + Units);
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Pos = (Units + 1) * 4;
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} else {
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// Otherwise do it the hard way.
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2010-11-19 08:48:58 +08:00
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// To be compatible with above bulk transfer, we need to take endianness
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// into account.
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2015-03-16 17:53:42 +08:00
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static_assert(sys::IsBigEndianHost || sys::IsLittleEndianHost,
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"Unexpected host endianness");
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2013-04-15 22:44:24 +08:00
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if (sys::IsBigEndianHost) {
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2010-11-19 08:48:58 +08:00
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for (Pos += 4; Pos <= Size; Pos += 4) {
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unsigned V = ((unsigned char)String[Pos - 4] << 24) |
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((unsigned char)String[Pos - 3] << 16) |
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((unsigned char)String[Pos - 2] << 8) |
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(unsigned char)String[Pos - 1];
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Bits.push_back(V);
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}
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2015-03-16 17:53:42 +08:00
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} else { // Little-endian host
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2010-11-19 08:48:58 +08:00
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for (Pos += 4; Pos <= Size; Pos += 4) {
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unsigned V = ((unsigned char)String[Pos - 1] << 24) |
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((unsigned char)String[Pos - 2] << 16) |
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((unsigned char)String[Pos - 3] << 8) |
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(unsigned char)String[Pos - 4];
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Bits.push_back(V);
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}
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2008-07-02 07:49:59 +08:00
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}
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}
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2018-07-31 03:41:25 +08:00
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2008-07-02 07:49:59 +08:00
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// With the leftover bits.
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unsigned V = 0;
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2010-11-19 08:48:58 +08:00
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// Pos will have overshot size by 4 - #bytes left over.
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// No need to take endianness into account here - this is always executed.
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2008-07-02 07:49:59 +08:00
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switch (Pos - Size) {
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2016-08-18 04:30:52 +08:00
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case 1: V = (V << 8) | (unsigned char)String[Size - 3]; LLVM_FALLTHROUGH;
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case 2: V = (V << 8) | (unsigned char)String[Size - 2]; LLVM_FALLTHROUGH;
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2008-07-02 07:49:59 +08:00
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case 3: V = (V << 8) | (unsigned char)String[Size - 1]; break;
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default: return; // Nothing left.
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}
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Bits.push_back(V);
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}
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2012-03-08 17:32:21 +08:00
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// AddNodeID - Adds the Bit data of another ID to *this.
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void FoldingSetNodeID::AddNodeID(const FoldingSetNodeID &ID) {
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Bits.append(ID.Bits.begin(), ID.Bits.end());
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}
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2018-07-31 03:41:25 +08:00
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/// ComputeHash - Compute a strong hash value for this FoldingSetNodeID, used to
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2017-06-13 04:52:53 +08:00
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/// lookup the node in the FoldingSetBase.
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2008-01-19 12:22:50 +08:00
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unsigned FoldingSetNodeID::ComputeHash() const {
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2010-08-25 07:16:53 +08:00
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return FoldingSetNodeIDRef(Bits.data(), Bits.size()).ComputeHash();
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2006-10-28 00:16:16 +08:00
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}
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/// operator== - Used to compare two nodes to each other.
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///
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2012-12-25 14:13:25 +08:00
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bool FoldingSetNodeID::operator==(const FoldingSetNodeID &RHS) const {
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2010-08-25 07:16:53 +08:00
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return *this == FoldingSetNodeIDRef(RHS.Bits.data(), RHS.Bits.size());
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2010-08-16 23:30:39 +08:00
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}
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/// operator== - Used to compare two nodes to each other.
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///
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bool FoldingSetNodeID::operator==(FoldingSetNodeIDRef RHS) const {
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2010-08-25 07:16:53 +08:00
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return FoldingSetNodeIDRef(Bits.data(), Bits.size()) == RHS;
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2006-10-28 00:16:16 +08:00
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}
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2012-09-08 12:25:29 +08:00
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/// Used to compare the "ordering" of two nodes as defined by the
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/// profiled bits and their ordering defined by memcmp().
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2012-12-25 14:13:25 +08:00
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bool FoldingSetNodeID::operator<(const FoldingSetNodeID &RHS) const {
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2012-09-08 12:25:29 +08:00
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return *this < FoldingSetNodeIDRef(RHS.Bits.data(), RHS.Bits.size());
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}
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bool FoldingSetNodeID::operator<(FoldingSetNodeIDRef RHS) const {
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return FoldingSetNodeIDRef(Bits.data(), Bits.size()) < RHS;
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}
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2010-03-19 00:16:38 +08:00
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/// Intern - Copy this node's data to a memory region allocated from the
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/// given allocator and return a FoldingSetNodeIDRef describing the
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/// interned data.
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FoldingSetNodeIDRef
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FoldingSetNodeID::Intern(BumpPtrAllocator &Allocator) const {
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unsigned *New = Allocator.Allocate<unsigned>(Bits.size());
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std::uninitialized_copy(Bits.begin(), Bits.end(), New);
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return FoldingSetNodeIDRef(New, Bits.size());
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}
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2006-10-28 00:16:16 +08:00
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//===----------------------------------------------------------------------===//
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2017-06-13 04:52:53 +08:00
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/// Helper functions for FoldingSetBase.
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2006-10-28 00:16:16 +08:00
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/// GetNextPtr - In order to save space, each bucket is a
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/// singly-linked-list. In order to make deletion more efficient, we make
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/// the list circular, so we can delete a node without computing its hash.
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/// The problem with this is that the start of the hash buckets are not
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2007-01-31 07:16:22 +08:00
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/// Nodes. If NextInBucketPtr is a bucket pointer, this method returns null:
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/// use GetBucketPtr when this happens.
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2017-06-13 04:52:53 +08:00
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static FoldingSetBase::Node *GetNextPtr(void *NextInBucketPtr) {
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2007-10-04 04:45:43 +08:00
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// The low bit is set if this is the pointer back to the bucket.
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if (reinterpret_cast<intptr_t>(NextInBucketPtr) & 1)
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2014-04-07 12:17:22 +08:00
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return nullptr;
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2018-07-31 03:41:25 +08:00
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2017-06-13 04:52:53 +08:00
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return static_cast<FoldingSetBase::Node*>(NextInBucketPtr);
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2006-10-28 00:16:16 +08:00
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}
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2008-02-05 05:11:17 +08:00
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2006-10-28 00:16:16 +08:00
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/// testing.
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2006-10-28 02:05:12 +08:00
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static void **GetBucketPtr(void *NextInBucketPtr) {
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2007-10-04 04:45:43 +08:00
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intptr_t Ptr = reinterpret_cast<intptr_t>(NextInBucketPtr);
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2007-10-04 05:12:09 +08:00
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assert((Ptr & 1) && "Not a bucket pointer");
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2007-10-04 04:45:43 +08:00
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return reinterpret_cast<void**>(Ptr & ~intptr_t(1));
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2006-10-28 00:16:16 +08:00
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}
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/// GetBucketFor - Hash the specified node ID and return the hash bucket for
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/// the specified ID.
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2010-08-16 23:30:39 +08:00
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static void **GetBucketFor(unsigned Hash, void **Buckets, unsigned NumBuckets) {
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2006-10-28 00:16:16 +08:00
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// NumBuckets is always a power of 2.
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2010-08-16 23:30:39 +08:00
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unsigned BucketNum = Hash & (NumBuckets-1);
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2006-10-28 02:05:12 +08:00
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return Buckets + BucketNum;
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}
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2010-06-20 01:00:31 +08:00
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/// AllocateBuckets - Allocated initialized bucket memory.
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static void **AllocateBuckets(unsigned NumBuckets) {
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2018-06-09 13:19:45 +08:00
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void **Buckets = static_cast<void**>(safe_calloc(NumBuckets + 1,
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sizeof(void*)));
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2010-06-20 01:00:31 +08:00
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// Set the very last bucket to be a non-null "pointer".
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Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
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return Buckets;
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}
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2006-10-28 02:05:12 +08:00
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//===----------------------------------------------------------------------===//
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2017-06-13 04:52:53 +08:00
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// FoldingSetBase Implementation
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2006-10-28 02:05:12 +08:00
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2017-06-13 04:52:53 +08:00
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void FoldingSetBase::anchor() {}
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2015-03-23 02:22:33 +08:00
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2017-06-13 04:52:53 +08:00
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FoldingSetBase::FoldingSetBase(unsigned Log2InitSize) {
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2006-11-02 22:21:26 +08:00
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assert(5 < Log2InitSize && Log2InitSize < 32 &&
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"Initial hash table size out of range");
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NumBuckets = 1 << Log2InitSize;
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2010-06-20 01:00:31 +08:00
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Buckets = AllocateBuckets(NumBuckets);
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NumNodes = 0;
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2006-10-28 02:05:12 +08:00
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}
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2015-08-17 07:17:27 +08:00
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2017-06-13 04:52:53 +08:00
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FoldingSetBase::FoldingSetBase(FoldingSetBase &&Arg)
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2015-08-17 07:17:27 +08:00
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: Buckets(Arg.Buckets), NumBuckets(Arg.NumBuckets), NumNodes(Arg.NumNodes) {
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Arg.Buckets = nullptr;
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Arg.NumBuckets = 0;
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Arg.NumNodes = 0;
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}
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2017-06-13 04:52:53 +08:00
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FoldingSetBase &FoldingSetBase::operator=(FoldingSetBase &&RHS) {
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2015-08-17 07:17:27 +08:00
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free(Buckets); // This may be null if the set is in a moved-from state.
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Buckets = RHS.Buckets;
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NumBuckets = RHS.NumBuckets;
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NumNodes = RHS.NumNodes;
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RHS.Buckets = nullptr;
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RHS.NumBuckets = 0;
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RHS.NumNodes = 0;
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return *this;
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}
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2017-06-13 04:52:53 +08:00
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FoldingSetBase::~FoldingSetBase() {
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2010-06-20 01:00:31 +08:00
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free(Buckets);
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2006-10-28 00:16:16 +08:00
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}
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2015-08-17 07:17:27 +08:00
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2017-06-13 04:52:53 +08:00
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void FoldingSetBase::clear() {
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2008-08-23 08:42:16 +08:00
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// Set all but the last bucket to null pointers.
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memset(Buckets, 0, NumBuckets*sizeof(void*));
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// Set the very last bucket to be a non-null "pointer".
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Buckets[NumBuckets] = reinterpret_cast<void*>(-1);
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// Reset the node count to zero.
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NumNodes = 0;
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}
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2006-10-28 00:16:16 +08:00
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2017-06-13 04:52:53 +08:00
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void FoldingSetBase::GrowBucketCount(unsigned NewBucketCount) {
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2016-06-03 21:54:48 +08:00
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assert((NewBucketCount > NumBuckets) && "Can't shrink a folding set with GrowBucketCount");
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assert(isPowerOf2_32(NewBucketCount) && "Bad bucket count!");
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2006-10-28 00:16:16 +08:00
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void **OldBuckets = Buckets;
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unsigned OldNumBuckets = NumBuckets;
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2018-07-31 03:41:25 +08:00
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2006-10-28 00:16:16 +08:00
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// Clear out new buckets.
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2017-07-20 09:30:39 +08:00
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|
|
Buckets = AllocateBuckets(NewBucketCount);
|
2018-09-15 00:12:14 +08:00
|
|
|
// Set NumBuckets only if allocation of new buckets was successful.
|
2018-07-31 03:41:25 +08:00
|
|
|
NumBuckets = NewBucketCount;
|
2010-06-20 01:00:31 +08:00
|
|
|
NumNodes = 0;
|
2007-10-04 04:45:43 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
// Walk the old buckets, rehashing nodes into their new place.
|
2010-08-16 23:30:39 +08:00
|
|
|
FoldingSetNodeID TempID;
|
2006-10-28 00:16:16 +08:00
|
|
|
for (unsigned i = 0; i != OldNumBuckets; ++i) {
|
|
|
|
void *Probe = OldBuckets[i];
|
|
|
|
if (!Probe) continue;
|
2007-10-04 04:45:43 +08:00
|
|
|
while (Node *NodeInBucket = GetNextPtr(Probe)) {
|
2006-10-28 00:16:16 +08:00
|
|
|
// Figure out the next link, remove NodeInBucket from the old link.
|
|
|
|
Probe = NodeInBucket->getNextInBucket();
|
2014-04-07 12:17:22 +08:00
|
|
|
NodeInBucket->SetNextInBucket(nullptr);
|
2006-10-28 00:16:16 +08:00
|
|
|
|
|
|
|
// Insert the node into the new bucket, after recomputing the hash.
|
2010-08-16 23:30:39 +08:00
|
|
|
InsertNode(NodeInBucket,
|
|
|
|
GetBucketFor(ComputeNodeHash(NodeInBucket, TempID),
|
|
|
|
Buckets, NumBuckets));
|
|
|
|
TempID.clear();
|
2006-10-28 00:16:16 +08:00
|
|
|
}
|
|
|
|
}
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2010-06-20 01:00:31 +08:00
|
|
|
free(OldBuckets);
|
2006-10-28 00:16:16 +08:00
|
|
|
}
|
|
|
|
|
2016-06-03 21:54:48 +08:00
|
|
|
/// GrowHashTable - Double the size of the hash table and rehash everything.
|
|
|
|
///
|
2017-06-13 04:52:53 +08:00
|
|
|
void FoldingSetBase::GrowHashTable() {
|
2016-06-03 21:54:48 +08:00
|
|
|
GrowBucketCount(NumBuckets * 2);
|
|
|
|
}
|
|
|
|
|
2017-06-13 04:52:53 +08:00
|
|
|
void FoldingSetBase::reserve(unsigned EltCount) {
|
2016-06-03 21:54:48 +08:00
|
|
|
// This will give us somewhere between EltCount / 2 and
|
|
|
|
// EltCount buckets. This puts us in the load factor
|
|
|
|
// range of 1.0 - 2.0.
|
|
|
|
if(EltCount < capacity())
|
|
|
|
return;
|
|
|
|
GrowBucketCount(PowerOf2Floor(EltCount));
|
|
|
|
}
|
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
/// FindNodeOrInsertPos - Look up the node specified by ID. If it exists,
|
|
|
|
/// return it. If not, return the insertion token that will make insertion
|
|
|
|
/// faster.
|
2017-06-13 04:52:53 +08:00
|
|
|
FoldingSetBase::Node *
|
|
|
|
FoldingSetBase::FindNodeOrInsertPos(const FoldingSetNodeID &ID,
|
|
|
|
void *&InsertPos) {
|
2012-04-11 22:06:47 +08:00
|
|
|
unsigned IDHash = ID.ComputeHash();
|
|
|
|
void **Bucket = GetBucketFor(IDHash, Buckets, NumBuckets);
|
2006-10-28 00:16:16 +08:00
|
|
|
void *Probe = *Bucket;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2014-04-07 12:17:22 +08:00
|
|
|
InsertPos = nullptr;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2010-08-16 23:30:39 +08:00
|
|
|
FoldingSetNodeID TempID;
|
2007-10-04 04:45:43 +08:00
|
|
|
while (Node *NodeInBucket = GetNextPtr(Probe)) {
|
2012-04-11 22:06:47 +08:00
|
|
|
if (NodeEquals(NodeInBucket, ID, IDHash, TempID))
|
2006-10-28 00:16:16 +08:00
|
|
|
return NodeInBucket;
|
2010-08-16 23:30:39 +08:00
|
|
|
TempID.clear();
|
2006-10-28 00:16:16 +08:00
|
|
|
|
|
|
|
Probe = NodeInBucket->getNextInBucket();
|
|
|
|
}
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
// Didn't find the node, return null with the bucket as the InsertPos.
|
|
|
|
InsertPos = Bucket;
|
2014-04-07 12:17:22 +08:00
|
|
|
return nullptr;
|
2006-10-28 00:16:16 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
/// InsertNode - Insert the specified node into the folding set, knowing that it
|
2018-07-31 03:41:25 +08:00
|
|
|
/// is not already in the map. InsertPos must be obtained from
|
2006-10-28 00:16:16 +08:00
|
|
|
/// FindNodeOrInsertPos.
|
2017-06-13 04:52:53 +08:00
|
|
|
void FoldingSetBase::InsertNode(Node *N, void *InsertPos) {
|
2014-04-15 14:32:26 +08:00
|
|
|
assert(!N->getNextInBucket());
|
2006-10-28 00:16:16 +08:00
|
|
|
// Do we need to grow the hashtable?
|
2016-06-03 21:54:48 +08:00
|
|
|
if (NumNodes+1 > capacity()) {
|
2006-10-28 00:16:16 +08:00
|
|
|
GrowHashTable();
|
2010-08-16 23:30:39 +08:00
|
|
|
FoldingSetNodeID TempID;
|
|
|
|
InsertPos = GetBucketFor(ComputeNodeHash(N, TempID), Buckets, NumBuckets);
|
2006-10-28 00:16:16 +08:00
|
|
|
}
|
2007-01-31 14:04:41 +08:00
|
|
|
|
|
|
|
++NumNodes;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
/// The insert position is actually a bucket pointer.
|
|
|
|
void **Bucket = static_cast<void**>(InsertPos);
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
void *Next = *Bucket;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
// If this is the first insertion into this bucket, its next pointer will be
|
2007-10-04 04:45:43 +08:00
|
|
|
// null. Pretend as if it pointed to itself, setting the low bit to indicate
|
|
|
|
// that it is a pointer to the bucket.
|
2014-04-09 12:20:00 +08:00
|
|
|
if (!Next)
|
2007-10-04 04:45:43 +08:00
|
|
|
Next = reinterpret_cast<void*>(reinterpret_cast<intptr_t>(Bucket)|1);
|
2006-10-28 00:16:16 +08:00
|
|
|
|
2007-01-31 14:04:41 +08:00
|
|
|
// Set the node's next pointer, and make the bucket point to the node.
|
2006-10-28 00:16:16 +08:00
|
|
|
N->SetNextInBucket(Next);
|
|
|
|
*Bucket = N;
|
|
|
|
}
|
|
|
|
|
|
|
|
/// RemoveNode - Remove a node from the folding set, returning true if one was
|
|
|
|
/// removed or false if the node was not in the folding set.
|
2017-06-13 04:52:53 +08:00
|
|
|
bool FoldingSetBase::RemoveNode(Node *N) {
|
2006-10-28 00:16:16 +08:00
|
|
|
// Because each bucket is a circular list, we don't need to compute N's hash
|
2007-02-01 13:33:21 +08:00
|
|
|
// to remove it.
|
2006-10-28 00:16:16 +08:00
|
|
|
void *Ptr = N->getNextInBucket();
|
2014-04-09 12:20:00 +08:00
|
|
|
if (!Ptr) return false; // Not in folding set.
|
2006-10-28 00:16:16 +08:00
|
|
|
|
|
|
|
--NumNodes;
|
2014-04-07 12:17:22 +08:00
|
|
|
N->SetNextInBucket(nullptr);
|
2006-10-28 00:16:16 +08:00
|
|
|
|
2007-02-01 13:33:21 +08:00
|
|
|
// Remember what N originally pointed to, either a bucket or another node.
|
2006-10-28 00:16:16 +08:00
|
|
|
void *NodeNextPtr = Ptr;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2007-02-01 13:33:21 +08:00
|
|
|
// Chase around the list until we find the node (or bucket) which points to N.
|
2006-10-28 00:16:16 +08:00
|
|
|
while (true) {
|
2007-10-04 04:45:43 +08:00
|
|
|
if (Node *NodeInBucket = GetNextPtr(Ptr)) {
|
2006-10-28 00:16:16 +08:00
|
|
|
// Advance pointer.
|
|
|
|
Ptr = NodeInBucket->getNextInBucket();
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
// We found a node that points to N, change it to point to N's next node,
|
|
|
|
// removing N from the list.
|
|
|
|
if (Ptr == N) {
|
|
|
|
NodeInBucket->SetNextInBucket(NodeNextPtr);
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
void **Bucket = GetBucketPtr(Ptr);
|
|
|
|
Ptr = *Bucket;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2006-10-28 00:16:16 +08:00
|
|
|
// If we found that the bucket points to N, update the bucket to point to
|
|
|
|
// whatever is next.
|
|
|
|
if (Ptr == N) {
|
|
|
|
*Bucket = NodeNextPtr;
|
|
|
|
return true;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
/// GetOrInsertNode - If there is an existing simple Node exactly
|
|
|
|
/// equal to the specified node, return it. Otherwise, insert 'N' and it
|
|
|
|
/// instead.
|
2017-06-13 04:52:53 +08:00
|
|
|
FoldingSetBase::Node *FoldingSetBase::GetOrInsertNode(FoldingSetBase::Node *N) {
|
2008-01-19 12:22:50 +08:00
|
|
|
FoldingSetNodeID ID;
|
2010-08-16 22:53:42 +08:00
|
|
|
GetNodeProfile(N, ID);
|
2006-10-28 00:16:16 +08:00
|
|
|
void *IP;
|
|
|
|
if (Node *E = FindNodeOrInsertPos(ID, IP))
|
|
|
|
return E;
|
|
|
|
InsertNode(N, IP);
|
|
|
|
return N;
|
|
|
|
}
|
2007-10-04 05:12:09 +08:00
|
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// FoldingSetIteratorImpl Implementation
|
|
|
|
|
|
|
|
FoldingSetIteratorImpl::FoldingSetIteratorImpl(void **Bucket) {
|
|
|
|
// Skip to the first non-null non-self-cycle bucket.
|
2008-02-16 05:12:46 +08:00
|
|
|
while (*Bucket != reinterpret_cast<void*>(-1) &&
|
2014-04-09 12:20:00 +08:00
|
|
|
(!*Bucket || !GetNextPtr(*Bucket)))
|
2007-10-04 05:12:09 +08:00
|
|
|
++Bucket;
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2007-10-04 05:12:09 +08:00
|
|
|
NodePtr = static_cast<FoldingSetNode*>(*Bucket);
|
|
|
|
}
|
|
|
|
|
|
|
|
void FoldingSetIteratorImpl::advance() {
|
|
|
|
// If there is another link within this bucket, go to it.
|
|
|
|
void *Probe = NodePtr->getNextInBucket();
|
|
|
|
|
|
|
|
if (FoldingSetNode *NextNodeInBucket = GetNextPtr(Probe))
|
|
|
|
NodePtr = NextNodeInBucket;
|
|
|
|
else {
|
2018-07-31 03:41:25 +08:00
|
|
|
// Otherwise, this is the last link in this bucket.
|
2007-10-04 05:12:09 +08:00
|
|
|
void **Bucket = GetBucketPtr(Probe);
|
|
|
|
|
|
|
|
// Skip to the next non-null non-self-cycle bucket.
|
|
|
|
do {
|
|
|
|
++Bucket;
|
2008-02-16 05:12:46 +08:00
|
|
|
} while (*Bucket != reinterpret_cast<void*>(-1) &&
|
2014-04-09 12:20:00 +08:00
|
|
|
(!*Bucket || !GetNextPtr(*Bucket)));
|
2018-07-31 03:41:25 +08:00
|
|
|
|
2007-10-04 05:12:09 +08:00
|
|
|
NodePtr = static_cast<FoldingSetNode*>(*Bucket);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2008-02-05 05:11:17 +08:00
|
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
// FoldingSetBucketIteratorImpl Implementation
|
|
|
|
|
|
|
|
FoldingSetBucketIteratorImpl::FoldingSetBucketIteratorImpl(void **Bucket) {
|
2014-04-09 12:20:00 +08:00
|
|
|
Ptr = (!*Bucket || !GetNextPtr(*Bucket)) ? (void*) Bucket : *Bucket;
|
2008-02-05 05:11:17 +08:00
|
|
|
}
|