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author | Reid Spencer <rspencer@reidspencer.com> | 2004-10-14 03:05:59 +0000 |
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committer | Reid Spencer <rspencer@reidspencer.com> | 2004-10-14 03:05:59 +0000 |
commit | 8545fc151e1807ea907dd387fba142c30ef8bf18 (patch) | |
tree | 849a574b14f5dd4c7a477f357326db160f84d856 | |
parent | f74acc7669a585f83ee2f4f51a89a7bf59f085a0 (diff) | |
download | external_llvm-8545fc151e1807ea907dd387fba142c30ef8bf18.zip external_llvm-8545fc151e1807ea907dd387fba142c30ef8bf18.tar.gz external_llvm-8545fc151e1807ea907dd387fba142c30ef8bf18.tar.bz2 |
Implementation of MappedFile for Win32. Patch provided by Jeff Cohen.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16968 91177308-0d34-0410-b5e6-96231b3b80d8
-rw-r--r-- | lib/System/Win32/MappedFile.cpp | 107 | ||||
-rw-r--r-- | lib/System/Win32/MappedFile.inc | 107 |
2 files changed, 202 insertions, 12 deletions
diff --git a/lib/System/Win32/MappedFile.cpp b/lib/System/Win32/MappedFile.cpp index d106eb1..3112a93 100644 --- a/lib/System/Win32/MappedFile.cpp +++ b/lib/System/Win32/MappedFile.cpp @@ -2,37 +2,132 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by Reid Spencer and is distributed under the +// This file was developed by Jeff Cohen and is distributed under the // University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // -// This file provides the Win32 specific implementation of the MappedFile -// concept. +// This file provides the Win32 implementation of the MappedFile concept. // //===----------------------------------------------------------------------===// +//===----------------------------------------------------------------------===// +//=== WARNING: Implementation here must contain only Win32 code. +//===----------------------------------------------------------------------===// + #include "Win32.h" +#include "llvm/System/MappedFile.h" +#include "llvm/System/Process.h" + +namespace llvm { +using namespace sys; + +struct sys::MappedFileInfo { + HANDLE hFile; + HANDLE hMapping; + size_t size; +}; void MappedFile::initialize() { + assert(!info_); + info_ = new MappedFileInfo; + info_->hFile = INVALID_HANDLE_VALUE; + info_->hMapping = NULL; + + DWORD mode = options_ & WRITE_ACCESS ? GENERIC_WRITE : GENERIC_READ; + DWORD disposition = options_ & WRITE_ACCESS ? OPEN_ALWAYS : OPEN_EXISTING; + DWORD share = options_ & WRITE_ACCESS ? FILE_SHARE_WRITE : FILE_SHARE_READ; + share = options_ & SHARED_MAPPING ? share : 0; + info_->hFile = CreateFile(path_.c_str(), mode, share, NULL, disposition, + FILE_ATTRIBUTE_NORMAL, NULL); + if (info_->hFile == INVALID_HANDLE_VALUE) { + delete info_; + info_ = NULL; + ThrowError(std::string("Can't open file: ") + path_.get()); + } + + LARGE_INTEGER size; + if (!GetFileSizeEx(info_->hFile, &size) || + (info_->size = size_t(size.QuadPart), info_->size != size.QuadPart)) { + CloseHandle(info_->hFile); + delete info_; + info_ = NULL; + ThrowError(std::string("Can't get size of file: ") + path_.get()); + } } void MappedFile::terminate() { + unmap(); + if (info_->hFile != INVALID_HANDLE_VALUE) + CloseHandle(info_->hFile); + delete info_; + info_ = NULL; } void MappedFile::unmap() { + assert(info_ && "MappedFile not initialized"); + if (isMapped()) { + UnmapViewOfFile(base_); + base_ = NULL; + } + if (info_->hMapping != INVALID_HANDLE_VALUE) { + CloseHandle(info_->hMapping); + info_->hMapping = NULL; + } } void* MappedFile::map() { - static char junk[4096]; - return junk; + if (!isMapped()) { + DWORD prot = PAGE_READONLY; + if (options_ & EXEC_ACCESS) + prot = SEC_IMAGE; + else if (options_ & WRITE_ACCESS) + prot = PAGE_READWRITE; + info_->hMapping = CreateFileMapping(info_->hFile, NULL, prot, 0, 0, NULL); + if (info_->hMapping == NULL) + ThrowError(std::string("Can't map file: ") + path_.get()); + + prot = (options_ & WRITE_ACCESS) ? FILE_MAP_WRITE : FILE_MAP_READ; + base_ = MapViewOfFileEx(info_->hMapping, prot, 0, 0, 0, NULL); + if (base_ == NULL) { + CloseHandle(info_->hMapping); + info_->hMapping = NULL; + ThrowError(std::string("Can't map file: ") + path_.get()); + } + } + return base_; } size_t MappedFile::size() { - return 4096; + assert(info_ && "MappedFile not initialized"); + return info_->size; } void MappedFile::size(size_t new_size) { + assert(info_ && "MappedFile not initialized"); + + // Take the mapping out of memory. + unmap(); + + // Adjust the new_size to a page boundary. + size_t pagesizem1 = Process::GetPageSize() - 1; + new_size = (new_size + pagesizem1) & ~pagesizem1; + + // If the file needs to be extended, do so. + if (new_size > info_->size) { + LARGE_INTEGER eof; + eof.QuadPart = new_size; + if (!SetFilePointerEx(info_->hFile, eof, NULL, FILE_BEGIN)) + ThrowError(std::string("Can't set end of file: ") + path_.get()); + if (!SetEndOfFile(info_->hFile)) + ThrowError(std::string("Can't set end of file: ") + path_.get()); + info_->size = new_size; + } + + // Remap the file. + map(); +} + } // vim: sw=2 smartindent smarttab tw=80 autoindent expandtab diff --git a/lib/System/Win32/MappedFile.inc b/lib/System/Win32/MappedFile.inc index d106eb1..3112a93 100644 --- a/lib/System/Win32/MappedFile.inc +++ b/lib/System/Win32/MappedFile.inc @@ -2,37 +2,132 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by Reid Spencer and is distributed under the +// This file was developed by Jeff Cohen and is distributed under the // University of Illinois Open Source License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // -// This file provides the Win32 specific implementation of the MappedFile -// concept. +// This file provides the Win32 implementation of the MappedFile concept. // //===----------------------------------------------------------------------===// +//===----------------------------------------------------------------------===// +//=== WARNING: Implementation here must contain only Win32 code. +//===----------------------------------------------------------------------===// + #include "Win32.h" +#include "llvm/System/MappedFile.h" +#include "llvm/System/Process.h" + +namespace llvm { +using namespace sys; + +struct sys::MappedFileInfo { + HANDLE hFile; + HANDLE hMapping; + size_t size; +}; void MappedFile::initialize() { + assert(!info_); + info_ = new MappedFileInfo; + info_->hFile = INVALID_HANDLE_VALUE; + info_->hMapping = NULL; + + DWORD mode = options_ & WRITE_ACCESS ? GENERIC_WRITE : GENERIC_READ; + DWORD disposition = options_ & WRITE_ACCESS ? OPEN_ALWAYS : OPEN_EXISTING; + DWORD share = options_ & WRITE_ACCESS ? FILE_SHARE_WRITE : FILE_SHARE_READ; + share = options_ & SHARED_MAPPING ? share : 0; + info_->hFile = CreateFile(path_.c_str(), mode, share, NULL, disposition, + FILE_ATTRIBUTE_NORMAL, NULL); + if (info_->hFile == INVALID_HANDLE_VALUE) { + delete info_; + info_ = NULL; + ThrowError(std::string("Can't open file: ") + path_.get()); + } + + LARGE_INTEGER size; + if (!GetFileSizeEx(info_->hFile, &size) || + (info_->size = size_t(size.QuadPart), info_->size != size.QuadPart)) { + CloseHandle(info_->hFile); + delete info_; + info_ = NULL; + ThrowError(std::string("Can't get size of file: ") + path_.get()); + } } void MappedFile::terminate() { + unmap(); + if (info_->hFile != INVALID_HANDLE_VALUE) + CloseHandle(info_->hFile); + delete info_; + info_ = NULL; } void MappedFile::unmap() { + assert(info_ && "MappedFile not initialized"); + if (isMapped()) { + UnmapViewOfFile(base_); + base_ = NULL; + } + if (info_->hMapping != INVALID_HANDLE_VALUE) { + CloseHandle(info_->hMapping); + info_->hMapping = NULL; + } } void* MappedFile::map() { - static char junk[4096]; - return junk; + if (!isMapped()) { + DWORD prot = PAGE_READONLY; + if (options_ & EXEC_ACCESS) + prot = SEC_IMAGE; + else if (options_ & WRITE_ACCESS) + prot = PAGE_READWRITE; + info_->hMapping = CreateFileMapping(info_->hFile, NULL, prot, 0, 0, NULL); + if (info_->hMapping == NULL) + ThrowError(std::string("Can't map file: ") + path_.get()); + + prot = (options_ & WRITE_ACCESS) ? FILE_MAP_WRITE : FILE_MAP_READ; + base_ = MapViewOfFileEx(info_->hMapping, prot, 0, 0, 0, NULL); + if (base_ == NULL) { + CloseHandle(info_->hMapping); + info_->hMapping = NULL; + ThrowError(std::string("Can't map file: ") + path_.get()); + } + } + return base_; } size_t MappedFile::size() { - return 4096; + assert(info_ && "MappedFile not initialized"); + return info_->size; } void MappedFile::size(size_t new_size) { + assert(info_ && "MappedFile not initialized"); + + // Take the mapping out of memory. + unmap(); + + // Adjust the new_size to a page boundary. + size_t pagesizem1 = Process::GetPageSize() - 1; + new_size = (new_size + pagesizem1) & ~pagesizem1; + + // If the file needs to be extended, do so. + if (new_size > info_->size) { + LARGE_INTEGER eof; + eof.QuadPart = new_size; + if (!SetFilePointerEx(info_->hFile, eof, NULL, FILE_BEGIN)) + ThrowError(std::string("Can't set end of file: ") + path_.get()); + if (!SetEndOfFile(info_->hFile)) + ThrowError(std::string("Can't set end of file: ") + path_.get()); + info_->size = new_size; + } + + // Remap the file. + map(); +} + } // vim: sw=2 smartindent smarttab tw=80 autoindent expandtab |