Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/DebugInfo/MSF/MSFCommon.h b/linux-x64/clang/include/llvm/DebugInfo/MSF/MSFCommon.h
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+//===- MSFCommon.h - Common types and functions for MSF files ---*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_DEBUGINFO_MSF_MSFCOMMON_H
+#define LLVM_DEBUGINFO_MSF_MSFCOMMON_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/Support/Endian.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MathExtras.h"
+#include <cstdint>
+#include <vector>
+
+namespace llvm {
+namespace msf {
+
+static const char Magic[] = {'M', 'i', 'c', 'r', 'o', 's', 'o', 'f',
+ 't', ' ', 'C', '/', 'C', '+', '+', ' ',
+ 'M', 'S', 'F', ' ', '7', '.', '0', '0',
+ '\r', '\n', '\x1a', 'D', 'S', '\0', '\0', '\0'};
+
+// The superblock is overlaid at the beginning of the file (offset 0).
+// It starts with a magic header and is followed by information which
+// describes the layout of the file system.
+struct SuperBlock {
+ char MagicBytes[sizeof(Magic)];
+ // The file system is split into a variable number of fixed size elements.
+ // These elements are referred to as blocks. The size of a block may vary
+ // from system to system.
+ support::ulittle32_t BlockSize;
+ // The index of the free block map.
+ support::ulittle32_t FreeBlockMapBlock;
+ // This contains the number of blocks resident in the file system. In
+ // practice, NumBlocks * BlockSize is equivalent to the size of the MSF
+ // file.
+ support::ulittle32_t NumBlocks;
+ // This contains the number of bytes which make up the directory.
+ support::ulittle32_t NumDirectoryBytes;
+ // This field's purpose is not yet known.
+ support::ulittle32_t Unknown1;
+ // This contains the block # of the block map.
+ support::ulittle32_t BlockMapAddr;
+};
+
+struct MSFLayout {
+ MSFLayout() = default;
+
+ uint32_t mainFpmBlock() const {
+ assert(SB->FreeBlockMapBlock == 1 || SB->FreeBlockMapBlock == 2);
+ return SB->FreeBlockMapBlock;
+ }
+
+ uint32_t alternateFpmBlock() const {
+ // If mainFpmBlock is 1, this is 2. If mainFpmBlock is 2, this is 1.
+ return 3U - mainFpmBlock();
+ }
+
+ const SuperBlock *SB = nullptr;
+ BitVector FreePageMap;
+ ArrayRef<support::ulittle32_t> DirectoryBlocks;
+ ArrayRef<support::ulittle32_t> StreamSizes;
+ std::vector<ArrayRef<support::ulittle32_t>> StreamMap;
+};
+
+/// \brief Describes the layout of a stream in an MSF layout. A "stream" here
+/// is defined as any logical unit of data which may be arranged inside the MSF
+/// file as a sequence of (possibly discontiguous) blocks. When we want to read
+/// from a particular MSF Stream, we fill out a stream layout structure and the
+/// reader uses it to determine which blocks in the underlying MSF file contain
+/// the data, so that it can be pieced together in the right order.
+class MSFStreamLayout {
+public:
+ uint32_t Length;
+ std::vector<support::ulittle32_t> Blocks;
+};
+
+/// \brief Determine the layout of the FPM stream, given the MSF layout. An FPM
+/// stream spans 1 or more blocks, each at equally spaced intervals throughout
+/// the file.
+MSFStreamLayout getFpmStreamLayout(const MSFLayout &Msf,
+ bool IncludeUnusedFpmData = false,
+ bool AltFpm = false);
+
+inline bool isValidBlockSize(uint32_t Size) {
+ switch (Size) {
+ case 512:
+ case 1024:
+ case 2048:
+ case 4096:
+ return true;
+ }
+ return false;
+}
+
+// Super Block, Fpm0, Fpm1, and Block Map
+inline uint32_t getMinimumBlockCount() { return 4; }
+
+// Super Block, Fpm0, and Fpm1 are reserved. The Block Map, although required
+// need not be at block 3.
+inline uint32_t getFirstUnreservedBlock() { return 3; }
+
+inline uint64_t bytesToBlocks(uint64_t NumBytes, uint64_t BlockSize) {
+ return divideCeil(NumBytes, BlockSize);
+}
+
+inline uint64_t blockToOffset(uint64_t BlockNumber, uint64_t BlockSize) {
+ return BlockNumber * BlockSize;
+}
+
+inline uint32_t getFpmIntervalLength(const MSFLayout &L) {
+ return L.SB->BlockSize;
+}
+
+/// Given an MSF with the specified block size and number of blocks, determine
+/// how many pieces the specified Fpm is split into.
+/// \p BlockSize - the block size of the MSF
+/// \p NumBlocks - the total number of blocks in the MSF
+/// \p IncludeUnusedFpmData - When true, this will count every block that is
+/// both in the file and matches the form of an FPM block, even if some of
+/// those FPM blocks are unused (a single FPM block can describe the
+/// allocation status of up to 32,767 blocks, although one appears only
+/// every 4,096 blocks). So there are 8x as many blocks that match the
+/// form as there are blocks that are necessary to describe the allocation
+/// status of the file. When this parameter is false, these extraneous
+/// trailing blocks are not counted.
+inline uint32_t getNumFpmIntervals(uint32_t BlockSize, uint32_t NumBlocks,
+ bool IncludeUnusedFpmData, int FpmNumber) {
+ assert(FpmNumber == 1 || FpmNumber == 2);
+ if (IncludeUnusedFpmData) {
+ // This calculation determines how many times a number of the form
+ // BlockSize * k + N appears in the range [0, NumBlocks). We only need to
+ // do this when unused data is included, since the number of blocks dwarfs
+ // the number of fpm blocks.
+ return divideCeil(NumBlocks - FpmNumber, BlockSize);
+ }
+
+ // We want the minimum number of intervals required, where each interval can
+ // represent BlockSize * 8 blocks.
+ return divideCeil(NumBlocks, 8 * BlockSize);
+}
+
+inline uint32_t getNumFpmIntervals(const MSFLayout &L,
+ bool IncludeUnusedFpmData = false,
+ bool AltFpm = false) {
+ return getNumFpmIntervals(L.SB->BlockSize, L.SB->NumBlocks,
+ IncludeUnusedFpmData,
+ AltFpm ? L.alternateFpmBlock() : L.mainFpmBlock());
+}
+
+Error validateSuperBlock(const SuperBlock &SB);
+
+} // end namespace msf
+} // end namespace llvm
+
+#endif // LLVM_DEBUGINFO_MSF_MSFCOMMON_H