replica
/
hanchenye-llvm-project
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

[PECOFF] Define constants for page size and disk sector size. 

llvm-svn: 183876
This commit is contained in:
Rui Ueyama 2013-06-12 23:45:32 +00:00
parent a1c9d4d932
commit cc14c02f7f
1 changed files with 12 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
lld/lib/ReaderWriter/PECOFF/WriterPECOFF.cpp
View File

@ -16,7 +16,7 @@
/// executable file. Currently it can only output ".text" section; other
/// sections including the symbol table are silently ignored.
///
/// This writer currently supports 32 bit PE/COFF only.
/// This writer currently supports 32 bit PE/COFF for x86 processor only.
///
//===----------------------------------------------------------------------===//
@ -44,6 +44,14 @@ namespace pecoff {
namespace {
// Page size of x86 processor. Some data needs to be aligned at page boundary
// when loaded into memory.
const int PAGE_SIZE = 4096;
// Disk sector size. Some data needs to be aligned at disk sector boundary in
// file.
const int SECTOR_SIZE = 512;
/// A Chunk is an abstrace contiguous range in an output file.
class Chunk {
public:
@ -131,10 +139,10 @@ public:
// Sections should be page-aligned when loaded into memory, which is 4KB on
// x86.
_peHeader.SectionAlignment = 4096;
_peHeader.SectionAlignment = PAGE_SIZE;
// Sections in an executable file on disk should be sector-aligned (512 byte).
_peHeader.FileAlignment = 512;
_peHeader.FileAlignment = SECTOR_SIZE;
// The required Windows version number. This is the internal version and
// shouldn't be confused with product name. Windows 7 is version 6.1 and
@ -289,7 +297,7 @@ public:
TextSectionChunk(const File &linkedFile)
: SectionChunk(createSectionHeader()) {
// The text section should be aligned to disk sector.
_align = 512;
_align = SECTOR_SIZE;
// Extract executable atoms from the linked file and append them to this
// section.