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CMake/Source/bindexplib.cxx

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