Line data    Source code

       1             : //===- MSFCommon.cpp - Common types and functions for MSF files -----------===//
       2             : //
       3             : //                     The LLVM Compiler Infrastructure
       4             : //
       5             : // This file is distributed under the University of Illinois Open Source
       6             : // License. See LICENSE.TXT for details.
       7             : //
       8             : //===----------------------------------------------------------------------===//
       9             : 
      10             : #include "llvm/DebugInfo/MSF/MSFCommon.h"
      11             : #include "llvm/DebugInfo/MSF/MSFError.h"
      12             : #include "llvm/Support/Endian.h"
      13             : #include "llvm/Support/Error.h"
      14             : #include <cstdint>
      15             : #include <cstring>
      16             : 
      17             : using namespace llvm;
      18             : using namespace llvm::msf;
      19             : 
      20         133 : Error llvm::msf::validateSuperBlock(const SuperBlock &SB) {
      21             :   // Check the magic bytes.
      22         133 :   if (std::memcmp(SB.MagicBytes, Magic, sizeof(Magic)) != 0)
      23             :     return make_error<MSFError>(msf_error_code::invalid_format,
      24             :                                 "MSF magic header doesn't match");
      25             : 
      26             :   if (!isValidBlockSize(SB.BlockSize))
      27             :     return make_error<MSFError>(msf_error_code::invalid_format,
      28             :                                 "Unsupported block size.");
      29             : 
      30             :   // We don't support directories whose sizes aren't a multiple of four bytes.
      31         131 :   if (SB.NumDirectoryBytes % sizeof(support::ulittle32_t) != 0)
      32             :     return make_error<MSFError>(msf_error_code::invalid_format,
      33             :                                 "Directory size is not multiple of 4.");
      34             : 
      35             :   // The number of blocks which comprise the directory is a simple function of
      36             :   // the number of bytes it contains.
      37             :   uint64_t NumDirectoryBlocks =
      38         131 :       bytesToBlocks(SB.NumDirectoryBytes, SB.BlockSize);
      39             : 
      40             :   // The directory, as we understand it, is a block which consists of a list of
      41             :   // block numbers.  It is unclear what would happen if the number of blocks
      42             :   // couldn't fit on a single block.
      43         131 :   if (NumDirectoryBlocks > SB.BlockSize / sizeof(support::ulittle32_t))
      44             :     return make_error<MSFError>(msf_error_code::invalid_format,
      45             :                                 "Too many directory blocks.");
      46             : 
      47         130 :   if (SB.BlockMapAddr == 0)
      48             :     return make_error<MSFError>(msf_error_code::invalid_format,
      49             :                                 "Block 0 is reserved");
      50             : 
      51         129 :   if (SB.BlockMapAddr >= SB.NumBlocks)
      52             :     return make_error<MSFError>(msf_error_code::invalid_format,
      53             :                                 "Block map address is invalid.");
      54             : 
      55         129 :   if (SB.FreeBlockMapBlock != 1 && SB.FreeBlockMapBlock != 2)
      56             :     return make_error<MSFError>(
      57             :         msf_error_code::invalid_format,
      58             :         "The free block map isn't at block 1 or block 2.");
      59             : 
      60             :   return Error::success();
      61             : }
      62             : 
      63         582 : MSFStreamLayout llvm::msf::getFpmStreamLayout(const MSFLayout &Msf,
      64             :                                               bool IncludeUnusedFpmData,
      65             :                                               bool AltFpm) {
      66             :   MSFStreamLayout FL;
      67             :   uint32_t NumFpmIntervals =
      68         582 :       getNumFpmIntervals(Msf, IncludeUnusedFpmData, AltFpm);
      69             : 
      70         582 :   uint32_t FpmBlock = AltFpm ? Msf.alternateFpmBlock() : Msf.mainFpmBlock();
      71             : 
      72        1180 :   for (uint32_t I = 0; I < NumFpmIntervals; ++I) {
      73         598 :     FL.Blocks.push_back(support::ulittle32_t(FpmBlock));
      74        1196 :     FpmBlock += msf::getFpmIntervalLength(Msf);
      75             :   }
      76             : 
      77         582 :   if (IncludeUnusedFpmData)
      78         450 :     FL.Length = NumFpmIntervals * Msf.SB->BlockSize;
      79             :   else
      80        1071 :     FL.Length = divideCeil(Msf.SB->NumBlocks, 8);
      81             : 
      82         582 :   return FL;
      83             : }