diff options
Diffstat (limited to 'tcl8.6/unix/tclLoadDyld.c')
| -rw-r--r-- | tcl8.6/unix/tclLoadDyld.c | 719 |
1 files changed, 719 insertions, 0 deletions
diff --git a/tcl8.6/unix/tclLoadDyld.c b/tcl8.6/unix/tclLoadDyld.c new file mode 100644 index 0000000..e998bf9 --- /dev/null +++ b/tcl8.6/unix/tclLoadDyld.c @@ -0,0 +1,719 @@ +/* + * tclLoadDyld.c -- + * + * This procedure provides a version of the TclLoadFile that works with + * Apple's dyld dynamic loading. + * Original version of his file (superseded long ago) provided by + * Wilfredo Sanchez (wsanchez@apple.com). + * + * Copyright (c) 1995 Apple Computer, Inc. + * Copyright (c) 2001-2007 Daniel A. Steffen <das@users.sourceforge.net> + * + * See the file "license.terms" for information on usage and redistribution of + * this file, and for a DISCLAIMER OF ALL WARRANTIES. + */ + +#include "tclInt.h" + +#ifndef MODULE_SCOPE +# define MODULE_SCOPE extern +#endif + +/* + * Use preferred dlfcn API on 10.4 and later + */ + +#ifndef TCL_DYLD_USE_DLFCN +# ifdef NO_DLFCN_H +# define TCL_DYLD_USE_DLFCN 0 +# else +# define TCL_DYLD_USE_DLFCN 1 +# endif +#endif + +/* + * Use deprecated NSModule API only to support 10.3 and earlier: + */ + +#ifndef TCL_DYLD_USE_NSMODULE +# define TCL_DYLD_USE_NSMODULE 0 +#endif + +/* + * Use includes for the API we're using. + */ + +#if TCL_DYLD_USE_DLFCN +# include <dlfcn.h> +#endif /* TCL_DYLD_USE_DLFCN */ + +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) +#if defined (__clang__) || ((__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ > 5)))) +#pragma GCC diagnostic ignored "-Wdeprecated-declarations" +#endif +#include <mach-o/dyld.h> +#include <mach-o/fat.h> +#include <mach-o/swap.h> +#include <mach-o/arch.h> +#include <libkern/OSByteOrder.h> +#include <mach/mach.h> + +typedef struct Tcl_DyldModuleHandle { + struct Tcl_DyldModuleHandle *nextPtr; + NSModule module; +} Tcl_DyldModuleHandle; +#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */ + +typedef struct { + void *dlHandle; +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) + const struct mach_header *dyldLibHeader; + Tcl_DyldModuleHandle *modulePtr; +#endif +} Tcl_DyldLoadHandle; + +#if TCL_DYLD_USE_DLFCN || defined(TCL_LOAD_FROM_MEMORY) +MODULE_SCOPE long tclMacOSXDarwinRelease; +#endif + +/* + * Static functions defined in this file. + */ + +static void * FindSymbol(Tcl_Interp *interp, + Tcl_LoadHandle loadHandle, const char *symbol); +static void UnloadFile(Tcl_LoadHandle handle); + +/* + *---------------------------------------------------------------------- + * + * DyldOFIErrorMsg -- + * + * Converts a numerical NSObjectFileImage error into an error message + * string. + * + * Results: + * Error message string. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) +static const char * +DyldOFIErrorMsg( + int err) +{ + switch(err) { + case NSObjectFileImageSuccess: + return NULL; + case NSObjectFileImageFailure: + return "object file setup failure"; + case NSObjectFileImageInappropriateFile: + return "not a Mach-O MH_BUNDLE file"; + case NSObjectFileImageArch: + return "no object for this architecture"; + case NSObjectFileImageFormat: + return "bad object file format"; + case NSObjectFileImageAccess: + return "can't read object file"; + default: + return "unknown error"; + } +} +#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */ + +/* + *---------------------------------------------------------------------- + * + * TclpDlopen -- + * + * Dynamically loads a binary code file into memory and returns a handle + * to the new code. + * + * Results: + * A standard Tcl completion code. If an error occurs, an error message + * is left in the interpreter's result. + * + * Side effects: + * New code suddenly appears in memory. + * + *---------------------------------------------------------------------- + */ + +MODULE_SCOPE int +TclpDlopen( + Tcl_Interp *interp, /* Used for error reporting. */ + Tcl_Obj *pathPtr, /* Name of the file containing the desired + * code (UTF-8). */ + Tcl_LoadHandle *loadHandle, /* Filled with token for dynamically loaded + * file which will be passed back to + * (*unloadProcPtr)() to unload the file. */ + Tcl_FSUnloadFileProc **unloadProcPtr, + /* Filled with address of Tcl_FSUnloadFileProc + * function which should be used for this + * file. */ + int flags) +{ + Tcl_DyldLoadHandle *dyldLoadHandle; + Tcl_LoadHandle newHandle; + void *dlHandle = NULL; +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) + const struct mach_header *dyldLibHeader = NULL; + Tcl_DyldModuleHandle *modulePtr = NULL; +#endif +#if TCL_DYLD_USE_NSMODULE + NSLinkEditErrors editError; + int errorNumber; + const char *errorName, *objFileImageErrMsg = NULL; +#endif /* TCL_DYLD_USE_NSMODULE */ + const char *errMsg = NULL; + int result; + Tcl_DString ds; + const char *nativePath, *nativeFileName = NULL; +#if TCL_DYLD_USE_DLFCN + int dlopenflags = 0; +#endif /* TCL_DYLD_USE_DLFCN */ + + /* + * First try the full path the user gave us. This is particularly + * important if the cwd is inside a vfs, and we are trying to load using a + * relative path. + */ + + nativePath = Tcl_FSGetNativePath(pathPtr); + nativeFileName = Tcl_UtfToExternalDString(NULL, Tcl_GetString(pathPtr), + -1, &ds); + +#if TCL_DYLD_USE_DLFCN + /* + * Use (RTLD_NOW|RTLD_LOCAL) as default, see [Bug #3216070] + */ + + if (flags & TCL_LOAD_GLOBAL) { + dlopenflags |= RTLD_GLOBAL; + } else { + dlopenflags |= RTLD_LOCAL; + } + if (flags & TCL_LOAD_LAZY) { + dlopenflags |= RTLD_LAZY; + } else { + dlopenflags |= RTLD_NOW; + } + dlHandle = dlopen(nativePath, dlopenflags); + if (!dlHandle) { + /* + * Let the OS loader examine the binary search path for whatever string + * the user gave us which hopefully refers to a file on the binary + * path. + */ + + dlHandle = dlopen(nativeFileName, dlopenflags); + if (!dlHandle) { + errMsg = dlerror(); + } + } +#endif /* TCL_DYLD_USE_DLFCN */ + + if (!dlHandle) { +#if TCL_DYLD_USE_NSMODULE + dyldLibHeader = NSAddImage(nativePath, + NSADDIMAGE_OPTION_RETURN_ON_ERROR); + if (!dyldLibHeader) { + NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg); + if (editError == NSLinkEditFileAccessError) { + /* + * The requested file was not found. Let the OS loader examine + * the binary search path for whatever string the user gave us + * which hopefully refers to a file on the binary path. + */ + + dyldLibHeader = NSAddImage(nativeFileName, + NSADDIMAGE_OPTION_WITH_SEARCHING | + NSADDIMAGE_OPTION_RETURN_ON_ERROR); + if (!dyldLibHeader) { + NSLinkEditError(&editError, &errorNumber, &errorName, + &errMsg); + } + } else if ((editError == NSLinkEditFileFormatError + && errorNumber == EBADMACHO) + || editError == NSLinkEditOtherError){ + NSObjectFileImageReturnCode err; + NSObjectFileImage dyldObjFileImage; + NSModule module; + + /* + * The requested file was found but was not of type MH_DYLIB, + * attempt to load it as a MH_BUNDLE. + */ + + err = NSCreateObjectFileImageFromFile(nativePath, + &dyldObjFileImage); + if (err == NSObjectFileImageSuccess && dyldObjFileImage) { + int nsflags = NSLINKMODULE_OPTION_RETURN_ON_ERROR; + if (!(flags & 1)) nsflags |= NSLINKMODULE_OPTION_PRIVATE; + if (!(flags & 2)) nsflags |= NSLINKMODULE_OPTION_BINDNOW; + module = NSLinkModule(dyldObjFileImage, nativePath, nsflags); + NSDestroyObjectFileImage(dyldObjFileImage); + if (module) { + modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle)); + modulePtr->module = module; + modulePtr->nextPtr = NULL; + } else { + NSLinkEditError(&editError, &errorNumber, &errorName, + &errMsg); + } + } else { + objFileImageErrMsg = DyldOFIErrorMsg(err); + } + } + } +#endif /* TCL_DYLD_USE_NSMODULE */ + } + + if (dlHandle +#if TCL_DYLD_USE_NSMODULE + || dyldLibHeader || modulePtr +#endif /* TCL_DYLD_USE_NSMODULE */ + ) { + dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle)); + dyldLoadHandle->dlHandle = dlHandle; +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) + dyldLoadHandle->dyldLibHeader = dyldLibHeader; + dyldLoadHandle->modulePtr = modulePtr; +#endif /* TCL_DYLD_USE_NSMODULE || TCL_LOAD_FROM_MEMORY */ + newHandle = ckalloc(sizeof(*newHandle)); + newHandle->clientData = dyldLoadHandle; + newHandle->findSymbolProcPtr = &FindSymbol; + newHandle->unloadFileProcPtr = &UnloadFile; + *unloadProcPtr = &UnloadFile; + *loadHandle = newHandle; + result = TCL_OK; + } else { + Tcl_Obj *errObj = Tcl_NewObj(); + + if (errMsg != NULL) { + Tcl_AppendToObj(errObj, errMsg, -1); + } +#if TCL_DYLD_USE_NSMODULE + if (objFileImageErrMsg) { + Tcl_AppendPrintfToObj(errObj, + "\nNSCreateObjectFileImageFromFile() error: %s", + objFileImageErrMsg); + } +#endif /* TCL_DYLD_USE_NSMODULE */ + Tcl_SetObjResult(interp, errObj); + result = TCL_ERROR; + } + + Tcl_DStringFree(&ds); + return result; +} + +/* + *---------------------------------------------------------------------- + * + * FindSymbol -- + * + * Looks up a symbol, by name, through a handle associated with a + * previously loaded piece of code (shared library). + * + * Results: + * Returns a pointer to the function associated with 'symbol' if it is + * found. Otherwise returns NULL and may leave an error message in the + * interp's result. + * + *---------------------------------------------------------------------- + */ + +static void * +FindSymbol( + Tcl_Interp *interp, /* For error reporting. */ + Tcl_LoadHandle loadHandle, /* Handle from TclpDlopen. */ + const char *symbol) /* Symbol name to look up. */ +{ + Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData; + Tcl_PackageInitProc *proc = NULL; + const char *errMsg = NULL; + Tcl_DString ds; + const char *native; + + native = Tcl_UtfToExternalDString(NULL, symbol, -1, &ds); + if (dyldLoadHandle->dlHandle) { +#if TCL_DYLD_USE_DLFCN + proc = dlsym(dyldLoadHandle->dlHandle, native); + if (!proc) { + errMsg = dlerror(); + } +#endif /* TCL_DYLD_USE_DLFCN */ + } else { +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) + NSSymbol nsSymbol = NULL; + Tcl_DString newName; + + /* + * dyld adds an underscore to the beginning of symbol names. + */ + + Tcl_DStringInit(&newName); + TclDStringAppendLiteral(&newName, "_"); + native = Tcl_DStringAppend(&newName, native, -1); + if (dyldLoadHandle->dyldLibHeader) { + nsSymbol = NSLookupSymbolInImage(dyldLoadHandle->dyldLibHeader, + native, NSLOOKUPSYMBOLINIMAGE_OPTION_BIND_NOW | + NSLOOKUPSYMBOLINIMAGE_OPTION_RETURN_ON_ERROR); + if (nsSymbol) { + /* + * Until dyld supports unloading of MY_DYLIB binaries, the + * following is not needed. + */ + +#ifdef DYLD_SUPPORTS_DYLIB_UNLOADING + NSModule module = NSModuleForSymbol(nsSymbol); + Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr; + + while (modulePtr != NULL) { + if (module == modulePtr->module) { + break; + } + modulePtr = modulePtr->nextPtr; + } + if (modulePtr == NULL) { + modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle)); + modulePtr->module = module; + modulePtr->nextPtr = dyldLoadHandle->modulePtr; + dyldLoadHandle->modulePtr = modulePtr; + } +#endif /* DYLD_SUPPORTS_DYLIB_UNLOADING */ + } else { + NSLinkEditErrors editError; + int errorNumber; + const char *errorName; + + NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg); + } + } else if (dyldLoadHandle->modulePtr) { + nsSymbol = NSLookupSymbolInModule( + dyldLoadHandle->modulePtr->module, native); + } + if (nsSymbol) { + proc = NSAddressOfSymbol(nsSymbol); + } + Tcl_DStringFree(&newName); +#endif /* TCL_DYLD_USE_NSMODULE */ + } + Tcl_DStringFree(&ds); + if (errMsg && (interp != NULL)) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "cannot find symbol \"%s\": %s", symbol, errMsg)); + Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "LOAD_SYMBOL", symbol, + NULL); + } + return proc; +} + +/* + *---------------------------------------------------------------------- + * + * UnloadFile -- + * + * Unloads a dynamically loaded binary code file from memory. Code + * pointers in the formerly loaded file are no longer valid after calling + * this function. + * + * Results: + * None. + * + * Side effects: + * Code dissapears from memory. Note that dyld currently only supports + * unloading of binaries of type MH_BUNDLE loaded with NSLinkModule() in + * TclpDlopen() above. + * + *---------------------------------------------------------------------- + */ + +static void +UnloadFile( + Tcl_LoadHandle loadHandle) /* loadHandle returned by a previous call to + * TclpDlopen(). The loadHandle is a token + * that represents the loaded file. */ +{ + Tcl_DyldLoadHandle *dyldLoadHandle = loadHandle->clientData; + + if (dyldLoadHandle->dlHandle) { +#if TCL_DYLD_USE_DLFCN + (void) dlclose(dyldLoadHandle->dlHandle); +#endif /* TCL_DYLD_USE_DLFCN */ + } else { +#if TCL_DYLD_USE_NSMODULE || defined(TCL_LOAD_FROM_MEMORY) + Tcl_DyldModuleHandle *modulePtr = dyldLoadHandle->modulePtr; + + while (modulePtr != NULL) { + void *ptr = modulePtr; + + (void) NSUnLinkModule(modulePtr->module, + NSUNLINKMODULE_OPTION_RESET_LAZY_REFERENCES); + modulePtr = modulePtr->nextPtr; + ckfree(ptr); + } +#endif /* TCL_DYLD_USE_NSMODULE */ + } + ckfree(dyldLoadHandle); + ckfree(loadHandle); +} + +/* + *---------------------------------------------------------------------- + * + * TclGuessPackageName -- + * + * If the "load" command is invoked without providing a package name, + * this procedure is invoked to try to figure it out. + * + * Results: + * Always returns 0 to indicate that we couldn't figure out a package + * name; generic code will then try to guess the package from the file + * name. A return value of 1 would have meant that we figured out the + * package name and put it in bufPtr. + * + * Side effects: + * None. + * + *---------------------------------------------------------------------- + */ + +int +TclGuessPackageName( + const char *fileName, /* Name of file containing package (already + * translated to local form if needed). */ + Tcl_DString *bufPtr) /* Initialized empty dstring. Append package + * name to this if possible. */ +{ + return 0; +} + +/* + *---------------------------------------------------------------------- + * + * TclpLoadMemoryGetBuffer -- + * + * Allocate a buffer that can be used with TclpLoadMemory() below. + * + * Results: + * Pointer to allocated buffer or NULL if an error occurs. + * + * Side effects: + * Buffer is allocated. + * + *---------------------------------------------------------------------- + */ + +#ifdef TCL_LOAD_FROM_MEMORY +MODULE_SCOPE void * +TclpLoadMemoryGetBuffer( + Tcl_Interp *interp, /* Used for error reporting. */ + int size) /* Size of desired buffer. */ +{ + void *buffer = NULL; + + /* + * NSCreateObjectFileImageFromMemory is available but always fails + * prior to Darwin 7. + */ + if (tclMacOSXDarwinRelease >= 7) { + /* + * We must allocate the buffer using vm_allocate, because + * NSCreateObjectFileImageFromMemory will dispose of it using + * vm_deallocate. + */ + + if (vm_allocate(mach_task_self(), (vm_address_t *) &buffer, size, 1)) { + buffer = NULL; + } + } + return buffer; +} +#endif /* TCL_LOAD_FROM_MEMORY */ + +/* + *---------------------------------------------------------------------- + * + * TclpLoadMemory -- + * + * Dynamically loads binary code file from memory and returns a handle to + * the new code. + * + * Results: + * A standard Tcl completion code. If an error occurs, an error message + * is left in the interpreter's result. + * + * Side effects: + * New code is loaded from memory. + * + *---------------------------------------------------------------------- + */ + +#ifdef TCL_LOAD_FROM_MEMORY +MODULE_SCOPE int +TclpLoadMemory( + Tcl_Interp *interp, /* Used for error reporting. */ + void *buffer, /* Buffer containing the desired code + * (allocated with TclpLoadMemoryGetBuffer). */ + int size, /* Allocation size of buffer. */ + int codeSize, /* Size of code data read into buffer or -1 if + * an error occurred and the buffer should + * just be freed. */ + Tcl_LoadHandle *loadHandle, /* Filled with token for dynamically loaded + * file which will be passed back to + * (*unloadProcPtr)() to unload the file. */ + Tcl_FSUnloadFileProc **unloadProcPtr, + /* Filled with address of Tcl_FSUnloadFileProc + * function which should be used for this + * file. */ + int flags) +{ + Tcl_LoadHandle newHandle; + Tcl_DyldLoadHandle *dyldLoadHandle; + NSObjectFileImage dyldObjFileImage = NULL; + Tcl_DyldModuleHandle *modulePtr; + NSModule module; + const char *objFileImageErrMsg = NULL; + int nsflags = NSLINKMODULE_OPTION_RETURN_ON_ERROR; + + /* + * Try to create an object file image that we can load from. + */ + + if (codeSize >= 0) { + NSObjectFileImageReturnCode err = NSObjectFileImageSuccess; + const struct fat_header *fh = buffer; + uint32_t ms = 0; +#ifndef __LP64__ + const struct mach_header *mh = NULL; +# define mh_size sizeof(struct mach_header) +# define mh_magic MH_MAGIC +# define arch_abi 0 +#else + const struct mach_header_64 *mh = NULL; +# define mh_size sizeof(struct mach_header_64) +# define mh_magic MH_MAGIC_64 +# define arch_abi CPU_ARCH_ABI64 +#endif /* __LP64__ */ + + if ((size_t) codeSize >= sizeof(struct fat_header) + && fh->magic == OSSwapHostToBigInt32(FAT_MAGIC)) { + uint32_t fh_nfat_arch = OSSwapBigToHostInt32(fh->nfat_arch); + + /* + * Fat binary, try to find mach_header for our architecture + */ + + if ((size_t) codeSize >= sizeof(struct fat_header) + + fh_nfat_arch * sizeof(struct fat_arch)) { + void *fatarchs = (char*)buffer + sizeof(struct fat_header); + const NXArchInfo *arch = NXGetLocalArchInfo(); + struct fat_arch *fa; + + if (fh->magic != FAT_MAGIC) { + swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder); + } + fa = NXFindBestFatArch(arch->cputype | arch_abi, + arch->cpusubtype, fatarchs, fh_nfat_arch); + if (fa) { + mh = (void *)((char *) buffer + fa->offset); + ms = fa->size; + } else { + err = NSObjectFileImageInappropriateFile; + } + if (fh->magic != FAT_MAGIC) { + swap_fat_arch(fatarchs, fh_nfat_arch, arch->byteorder); + } + } else { + err = NSObjectFileImageInappropriateFile; + } + } else { + /* + * Thin binary + */ + + mh = buffer; + ms = codeSize; + } + if (ms && !(ms >= mh_size && mh->magic == mh_magic && + mh->filetype == MH_BUNDLE)) { + err = NSObjectFileImageInappropriateFile; + } + if (err == NSObjectFileImageSuccess) { + err = NSCreateObjectFileImageFromMemory(buffer, codeSize, + &dyldObjFileImage); + if (err != NSObjectFileImageSuccess) { + objFileImageErrMsg = DyldOFIErrorMsg(err); + } + } else { + objFileImageErrMsg = DyldOFIErrorMsg(err); + } + } + + /* + * If it went wrong (or we were asked to just deallocate), get rid of the + * memory block and create an error message. + */ + + if (dyldObjFileImage == NULL) { + vm_deallocate(mach_task_self(), (vm_address_t) buffer, size); + if (objFileImageErrMsg != NULL) { + Tcl_SetObjResult(interp, Tcl_ObjPrintf( + "NSCreateObjectFileImageFromMemory() error: %s", + objFileImageErrMsg)); + } + return TCL_ERROR; + } + + /* + * Extract the module we want from the image of the object file. + */ + + if (!(flags & 1)) nsflags |= NSLINKMODULE_OPTION_PRIVATE; + if (!(flags & 2)) nsflags |= NSLINKMODULE_OPTION_BINDNOW; + module = NSLinkModule(dyldObjFileImage, "[Memory Based Bundle]", nsflags); + NSDestroyObjectFileImage(dyldObjFileImage); + if (!module) { + NSLinkEditErrors editError; + int errorNumber; + const char *errorName, *errMsg; + + NSLinkEditError(&editError, &errorNumber, &errorName, &errMsg); + Tcl_SetObjResult(interp, Tcl_NewStringObj(errMsg, -1)); + return TCL_ERROR; + } + + /* + * Stash the module reference within the load handle we create and return. + */ + + modulePtr = ckalloc(sizeof(Tcl_DyldModuleHandle)); + modulePtr->module = module; + modulePtr->nextPtr = NULL; + dyldLoadHandle = ckalloc(sizeof(Tcl_DyldLoadHandle)); + dyldLoadHandle->dlHandle = NULL; + dyldLoadHandle->dyldLibHeader = NULL; + dyldLoadHandle->modulePtr = modulePtr; + newHandle = ckalloc(sizeof(*newHandle)); + newHandle->clientData = dyldLoadHandle; + newHandle->findSymbolProcPtr = &FindSymbol; + newHandle->unloadFileProcPtr = &UnloadFile; + *loadHandle = newHandle; + *unloadProcPtr = &UnloadFile; + return TCL_OK; +} +#endif /* TCL_LOAD_FROM_MEMORY */ + +/* + * Local Variables: + * mode: c + * c-basic-offset: 4 + * fill-column: 79 + * End: + */ |