440 lines
15 KiB
C++
440 lines
15 KiB
C++
/*============================================================================
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CMake - Cross Platform Makefile Generator
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Copyright 2000-2015 Kitware, Inc.
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Distributed under the OSI-approved BSD License (the "License");
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see accompanying file Copyright.txt for details.
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This software is distributed WITHOUT ANY WARRANTY; without even the
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implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the License for more information.
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============================================================================*/
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/*-------------------------------------------------------------------------
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Portions of this source have been derived from the 'bindexplib' tool
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provided by the CERN ROOT Data Analysis Framework project (root.cern.ch).
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Permission has been granted by Pere Mato <pere.mato@cern.ch> to distribute
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this derived work under the CMake license.
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-------------------------------------------------------------------------*/
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/*
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*----------------------------------------------------------------------
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* Program: dumpexts.exe
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* Author: Gordon Chaffee
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*
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* History: The real functionality of this file was written by
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* Matt Pietrek in 1993 in his pedump utility. I've
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* modified it to dump the externals in a bunch of object
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* files to create a .def file.
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*
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* Notes: Visual C++ puts an underscore before each exported symbol.
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* This file removes them. I don't know if this is a problem
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* this other compilers. If _MSC_VER is defined,
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* the underscore is removed. If not, it isn't. To get a
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* full dump of an object file, use the -f option. This can
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* help determine the something that may be different with a
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* compiler other than Visual C++.
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* ======================================
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* Corrections (Axel 2006-04-04):
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* Conversion to C++. Mostly.
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*
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* Extension (Axel 2006-03-15)
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* As soon as an object file contains an /EXPORT directive (which
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* is generated by the compiler when a symbol is declared as
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* declspec(dllexport)) no to-be-exported symbols are printed,
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* as the linker will see these directives, and if those directives
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* are present we only export selectively (i.e. we trust the
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* programmer).
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*
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* ======================================
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* ======================================
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* Corrections (Valery Fine 23/02/98):
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*
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* The "(vector) deleting destructor" MUST not be exported
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* To recognize it the following test are introduced:
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* "@@UAEPAXI@Z" scalar deleting dtor
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* "@@QAEPAXI@Z" vector deleting dtor
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* "AEPAXI@Z" vector deleting dtor with thunk adjustor
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* ======================================
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* Corrections (Valery Fine 12/02/97):
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*
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* It created a wrong EXPORTS for the global pointers and constants.
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* The Section Header has been involved to discover the missing information
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* Now the pointers are correctly supplied supplied with "DATA" descriptor
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* the constants with no extra descriptor.
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*
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* Corrections (Valery Fine 16/09/96):
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*
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* It didn't work for C++ code with global variables and class definitons
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* The DumpExternalObject function has been introduced to generate .DEF file
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*
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* Author: Valery Fine 16/09/96 (E-mail: fine@vxcern.cern.ch)
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*----------------------------------------------------------------------
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*/
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#include <cmsys/Encoding.hxx>
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#include <windows.h>
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#include <stdio.h>
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#include <string>
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#include <fstream>
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#include <iostream>
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typedef struct cmANON_OBJECT_HEADER_BIGOBJ {
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/* same as ANON_OBJECT_HEADER_V2 */
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WORD Sig1; // Must be IMAGE_FILE_MACHINE_UNKNOWN
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WORD Sig2; // Must be 0xffff
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WORD Version; // >= 2 (implies the Flags field is present)
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WORD Machine; // Actual machine - IMAGE_FILE_MACHINE_xxx
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DWORD TimeDateStamp;
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CLSID ClassID; // {D1BAA1C7-BAEE-4ba9-AF20-FAF66AA4DCB8}
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DWORD SizeOfData; // Size of data that follows the header
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DWORD Flags; // 0x1 -> contains metadata
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DWORD MetaDataSize; // Size of CLR metadata
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DWORD MetaDataOffset; // Offset of CLR metadata
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/* bigobj specifics */
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DWORD NumberOfSections; // extended from WORD
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DWORD PointerToSymbolTable;
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DWORD NumberOfSymbols;
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} cmANON_OBJECT_HEADER_BIGOBJ;
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typedef struct _cmIMAGE_SYMBOL_EX {
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union {
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BYTE ShortName[8];
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struct {
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DWORD Short; // if 0, use LongName
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DWORD Long; // offset into string table
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} Name;
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DWORD LongName[2]; // PBYTE [2]
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} N;
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DWORD Value;
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LONG SectionNumber;
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WORD Type;
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BYTE StorageClass;
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BYTE NumberOfAuxSymbols;
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} cmIMAGE_SYMBOL_EX;
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typedef cmIMAGE_SYMBOL_EX UNALIGNED *cmPIMAGE_SYMBOL_EX;
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PIMAGE_SECTION_HEADER GetSectionHeaderOffset(PIMAGE_FILE_HEADER
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pImageFileHeader)
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{
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return (PIMAGE_SECTION_HEADER)
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((DWORD_PTR)pImageFileHeader +
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IMAGE_SIZEOF_FILE_HEADER +
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pImageFileHeader->SizeOfOptionalHeader);
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}
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PIMAGE_SECTION_HEADER GetSectionHeaderOffset(cmANON_OBJECT_HEADER_BIGOBJ*
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pImageFileHeader)
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{
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return (PIMAGE_SECTION_HEADER)
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((DWORD_PTR)pImageFileHeader +
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sizeof(cmANON_OBJECT_HEADER_BIGOBJ));
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}
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/*
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+ * Utility func, strstr with size
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+ */
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const char* StrNStr(const char* start, const char* find, size_t &size) {
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size_t len;
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const char* hint;
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if (!start || !find || !size) {
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size = 0;
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return 0;
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}
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len = strlen(find);
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while ((hint = (const char*) memchr(start, find[0], size-len+1))) {
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size -= (hint - start);
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if (!strncmp(hint, find, len))
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return hint;
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start = hint + 1;
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}
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size = 0;
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return 0;
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}
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template <
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// cmANON_OBJECT_HEADER_BIGOBJ or IMAGE_FILE_HEADER
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class ObjectHeaderType,
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// cmPIMAGE_SYMBOL_EX or PIMAGE_SYMBOL
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class SymbolTableType>
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class DumpSymbols
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{
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public:
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/*
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*----------------------------------------------------------------------
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* Constructor --
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*
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* Initialize variables from pointer to object header.
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*
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*----------------------------------------------------------------------
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*/
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DumpSymbols(ObjectHeaderType* ih,
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FILE* fout, bool is64) {
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this->ObjectImageHeader = ih;
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this->SymbolTable = (SymbolTableType*)
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((DWORD_PTR)this->ObjectImageHeader
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+ this->ObjectImageHeader->PointerToSymbolTable);
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this->FileOut = fout;
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this->SectionHeaders =
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GetSectionHeaderOffset(this->ObjectImageHeader);
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this->ImportFlag = true;
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this->SymbolCount = this->ObjectImageHeader->NumberOfSymbols;
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this->Is64Bit = is64;
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}
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/*
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*----------------------------------------------------------------------
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* HaveExportedObjects --
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*
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* Returns true if export directives (declspec(dllexport)) exist.
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*
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*----------------------------------------------------------------------
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*/
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bool HaveExportedObjects() {
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WORD i = 0;
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size_t size = 0;
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const char * rawdata = 0;
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PIMAGE_SECTION_HEADER pDirectivesSectionHeader = 0;
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PIMAGE_SECTION_HEADER pSectionHeaders = this->SectionHeaders;
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for(i = 0; (i < this->ObjectImageHeader->NumberOfSections &&
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!pDirectivesSectionHeader); i++)
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if (!strncmp((const char*)&pSectionHeaders[i].Name[0], ".drectve",8))
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pDirectivesSectionHeader = &pSectionHeaders[i];
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if (!pDirectivesSectionHeader) return 0;
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rawdata=(const char*)
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this->ObjectImageHeader+pDirectivesSectionHeader->PointerToRawData;
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if (!pDirectivesSectionHeader->PointerToRawData || !rawdata) return 0;
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size = pDirectivesSectionHeader->SizeOfRawData;
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const char* posImportFlag = rawdata;
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while ((posImportFlag = StrNStr(posImportFlag, " /EXPORT:", size))) {
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const char* lookingForDict = posImportFlag + 9;
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if (!strncmp(lookingForDict, "_G__cpp_",8) ||
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!strncmp(lookingForDict, "_G__set_cpp_",12)) {
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posImportFlag = lookingForDict;
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continue;
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}
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const char* lookingForDATA = posImportFlag + 9;
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while (*(++lookingForDATA) && *lookingForDATA != ' ');
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lookingForDATA -= 5;
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// ignore DATA exports
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if (strncmp(lookingForDATA, ",DATA", 5)) break;
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posImportFlag = lookingForDATA + 5;
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}
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if(posImportFlag) {
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return true;
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}
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return false;
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}
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/*
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*----------------------------------------------------------------------
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* DumpObjFile --
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*
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* Dump an object file's exported symbols.
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*----------------------------------------------------------------------
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*/
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void DumpObjFile() {
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if(!HaveExportedObjects()) {
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this->DumpExternalsObjects();
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}
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}
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/*
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*----------------------------------------------------------------------
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* DumpExternalsObjects --
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*
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* Dumps a COFF symbol table from an OBJ.
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*----------------------------------------------------------------------
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*/
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void DumpExternalsObjects() {
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unsigned i;
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PSTR stringTable;
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std::string symbol;
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DWORD SectChar;
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/*
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* The string table apparently starts right after the symbol table
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*/
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stringTable = (PSTR)&this->SymbolTable[this->SymbolCount];
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SymbolTableType* pSymbolTable = this->SymbolTable;
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for ( i=0; i < this->SymbolCount; i++ ) {
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if (pSymbolTable->SectionNumber > 0 &&
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( pSymbolTable->Type == 0x20 || pSymbolTable->Type == 0x0)) {
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if (pSymbolTable->StorageClass == IMAGE_SYM_CLASS_EXTERNAL) {
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/*
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* The name of the Function entry points
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*/
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if (pSymbolTable->N.Name.Short != 0) {
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symbol = "";
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symbol.insert(0, (const char *)pSymbolTable->N.ShortName, 8);
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} else {
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symbol = stringTable + pSymbolTable->N.Name.Long;
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}
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// clear out any leading spaces
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while (isspace(symbol[0])) symbol.erase(0,1);
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// if it starts with _ and has an @ then it is a __cdecl
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// so remove the @ stuff for the export
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if(symbol[0] == '_') {
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std::string::size_type posAt = symbol.find('@');
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if (posAt != std::string::npos) {
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symbol.erase(posAt);
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}
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}
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// For 64 bit builds we don't need to remove _
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if(!this->Is64Bit)
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{
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if (symbol[0] == '_')
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{
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symbol.erase(0,1);
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}
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}
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if (this->ImportFlag) {
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this->ImportFlag = false;
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fprintf(this->FileOut,"EXPORTS \n");
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}
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/*
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Check whether it is "Scalar deleting destructor" and
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"Vector deleting destructor"
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*/
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const char *scalarPrefix = "??_G";
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const char *vectorPrefix = "??_E";
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// original code had a check for
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// symbol.find("real@") == std::string::npos)
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// but if this disallows memmber functions with the name real
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// if scalarPrefix and vectorPrefix are not found then print
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// the symbol
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if (symbol.compare(0, 4, scalarPrefix) &&
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symbol.compare(0, 4, vectorPrefix) )
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{
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SectChar =
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this->
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SectionHeaders[pSymbolTable->SectionNumber-1].Characteristics;
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if (!pSymbolTable->Type && (SectChar & IMAGE_SCN_MEM_WRITE)) {
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// Read only (i.e. constants) must be excluded
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fprintf(this->FileOut, "\t%s \t DATA\n", symbol.c_str());
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} else {
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if ( pSymbolTable->Type ||
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!(SectChar & IMAGE_SCN_MEM_READ)) {
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fprintf(this->FileOut, "\t%s\n", symbol.c_str());
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} else {
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// printf(" strange symbol: %s \n",symbol.c_str());
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}
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}
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}
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}
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}
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else if (pSymbolTable->SectionNumber == IMAGE_SYM_UNDEFINED &&
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!pSymbolTable->Type && 0) {
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/*
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* The IMPORT global variable entry points
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*/
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if (pSymbolTable->StorageClass == IMAGE_SYM_CLASS_EXTERNAL) {
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symbol = stringTable + pSymbolTable->N.Name.Long;
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while (isspace(symbol[0])) symbol.erase(0,1);
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if (symbol[0] == '_') symbol.erase(0,1);
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if (!this->ImportFlag) {
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this->ImportFlag = true;
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fprintf(this->FileOut,"IMPORTS \n");
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}
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fprintf(this->FileOut, "\t%s DATA \n", symbol.c_str()+1);
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}
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}
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/*
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* Take into account any aux symbols
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*/
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i += pSymbolTable->NumberOfAuxSymbols;
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pSymbolTable += pSymbolTable->NumberOfAuxSymbols;
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pSymbolTable++;
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}
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}
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private:
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bool ImportFlag;
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FILE* FileOut;
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DWORD_PTR SymbolCount;
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PIMAGE_SECTION_HEADER SectionHeaders;
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ObjectHeaderType* ObjectImageHeader;
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SymbolTableType* SymbolTable;
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bool Is64Bit;
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};
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bool
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DumpFile(const char* filename, FILE *fout)
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{
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HANDLE hFile;
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HANDLE hFileMapping;
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LPVOID lpFileBase;
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PIMAGE_DOS_HEADER dosHeader;
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hFile = CreateFileW(cmsys::Encoding::ToWide(filename).c_str(),
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GENERIC_READ, FILE_SHARE_READ, NULL,
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OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0);
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if (hFile == INVALID_HANDLE_VALUE) {
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fprintf(stderr, "Couldn't open file '%s' with CreateFile()\n", filename);
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return false;
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}
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hFileMapping = CreateFileMapping(hFile, NULL, PAGE_READONLY, 0, 0, NULL);
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if (hFileMapping == 0) {
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CloseHandle(hFile);
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fprintf(stderr, "Couldn't open file mapping with CreateFileMapping()\n");
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return false;
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}
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lpFileBase = MapViewOfFile(hFileMapping, FILE_MAP_READ, 0, 0, 0);
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if (lpFileBase == 0) {
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CloseHandle(hFileMapping);
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CloseHandle(hFile);
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fprintf(stderr, "Couldn't map view of file with MapViewOfFile()\n");
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return false;
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}
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dosHeader = (PIMAGE_DOS_HEADER)lpFileBase;
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if (dosHeader->e_magic == IMAGE_DOS_SIGNATURE) {
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fprintf(stderr, "File is an executable. I don't dump those.\n");
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return false;
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}
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/* Does it look like a i386 COFF OBJ file??? */
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else if (
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((dosHeader->e_magic == IMAGE_FILE_MACHINE_I386) ||
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(dosHeader->e_magic == IMAGE_FILE_MACHINE_AMD64))
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&& (dosHeader->e_sp == 0)
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) {
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/*
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* The two tests above aren't what they look like. They're
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* really checking for IMAGE_FILE_HEADER.Machine == i386 (0x14C)
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* and IMAGE_FILE_HEADER.SizeOfOptionalHeader == 0;
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*/
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DumpSymbols<IMAGE_FILE_HEADER, IMAGE_SYMBOL>
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symbolDumper((PIMAGE_FILE_HEADER) lpFileBase, fout,
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(dosHeader->e_magic == IMAGE_FILE_MACHINE_AMD64));
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symbolDumper.DumpObjFile();
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} else {
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// check for /bigobj format
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cmANON_OBJECT_HEADER_BIGOBJ* h =
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(cmANON_OBJECT_HEADER_BIGOBJ*) lpFileBase;
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if(h->Sig1 == 0x0 && h->Sig2 == 0xffff) {
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DumpSymbols<cmANON_OBJECT_HEADER_BIGOBJ, cmIMAGE_SYMBOL_EX>
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symbolDumper((cmANON_OBJECT_HEADER_BIGOBJ*) lpFileBase, fout,
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(dosHeader->e_magic == IMAGE_FILE_MACHINE_AMD64));
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symbolDumper.DumpObjFile();
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} else {
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printf("unrecognized file format in '%s'\n", filename);
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return false;
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}
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}
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UnmapViewOfFile(lpFileBase);
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CloseHandle(hFileMapping);
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CloseHandle(hFile);
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return true;
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}
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