// plugin.cc -- plugin manager for gold -*- C++ -*-
-// Copyright 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2008-2020 Free Software Foundation, Inc.
// Written by Cary Coutant <ccoutant@google.com>.
// This file is part of gold.
#include "gold.h"
+#include <cerrno>
#include <cstdio>
#include <cstdarg>
#include <cstring>
#include <string>
#include <vector>
+#include <fcntl.h>
+#include <unistd.h>
+#include "libiberty.h"
#ifdef ENABLE_PLUGINS
+#ifdef HAVE_DLFCN_H
#include <dlfcn.h>
+#elif defined (HAVE_WINDOWS_H)
+#include <windows.h>
+#else
+#error Unknown how to handle dynamic-load-libraries.
#endif
+#if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H)
+
+#define RTLD_NOW 0 /* Dummy value. */
+static void *
+dlopen(const char *file, int mode ATTRIBUTE_UNUSED)
+{
+ return LoadLibrary(file);
+}
+
+static void *
+dlsym(void *handle, const char *name)
+{
+ return reinterpret_cast<void *>(
+ GetProcAddress(static_cast<HMODULE>(handle),name));
+}
+
+static const char *
+dlerror(void)
+{
+ return "unable to load dll";
+}
+
+#endif /* !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) */
+#endif /* ENABLE_PLUGINS */
+
#include "parameters.h"
+#include "debug.h"
#include "errors.h"
#include "fileread.h"
#include "layout.h"
#include "target.h"
#include "readsyms.h"
#include "symtab.h"
+#include "descriptors.h"
#include "elfcpp.h"
namespace gold
static enum ld_plugin_status
get_input_file(const void *handle, struct ld_plugin_input_file *file);
+static enum ld_plugin_status
+get_view(const void *handle, const void **viewp);
+
static enum ld_plugin_status
release_input_file(const void *handle);
static enum ld_plugin_status
get_symbols(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
+static enum ld_plugin_status
+get_symbols_v2(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
+
+static enum ld_plugin_status
+get_symbols_v3(const void *handle, int nsyms, struct ld_plugin_symbol *syms);
+
static enum ld_plugin_status
add_input_file(const char *pathname);
static enum ld_plugin_status
message(int level, const char *format, ...);
+static enum ld_plugin_status
+get_input_section_count(const void* handle, unsigned int* count);
+
+static enum ld_plugin_status
+get_input_section_type(const struct ld_plugin_section section,
+ unsigned int* type);
+
+static enum ld_plugin_status
+get_input_section_name(const struct ld_plugin_section section,
+ char** section_name_ptr);
+
+static enum ld_plugin_status
+get_input_section_contents(const struct ld_plugin_section section,
+ const unsigned char** section_contents,
+ size_t* len);
+
+static enum ld_plugin_status
+update_section_order(const struct ld_plugin_section *section_list,
+ unsigned int num_sections);
+
+static enum ld_plugin_status
+allow_section_ordering();
+
+static enum ld_plugin_status
+allow_unique_segment_for_sections();
+
+static enum ld_plugin_status
+unique_segment_for_sections(const char* segment_name,
+ uint64_t flags,
+ uint64_t align,
+ const struct ld_plugin_section *section_list,
+ unsigned int num_sections);
+
+static enum ld_plugin_status
+get_input_section_alignment(const struct ld_plugin_section section,
+ unsigned int* addralign);
+
+static enum ld_plugin_status
+get_input_section_size(const struct ld_plugin_section section,
+ uint64_t* secsize);
+
+static enum ld_plugin_status
+register_new_input(ld_plugin_new_input_handler handler);
+
+static enum ld_plugin_status
+get_wrap_symbols(uint64_t *num_symbols, const char ***wrap_symbol_list);
+
};
#endif // ENABLE_PLUGINS
-static Pluginobj* make_sized_plugin_object(Input_file* input_file,
+static Pluginobj* make_sized_plugin_object(const std::string& filename,
+ Input_file* input_file,
off_t offset, off_t filesize);
// Plugin methods.
sscanf(ver, "%d.%d", &major, &minor);
// Allocate and populate a transfer vector.
- const int tv_fixed_size = 16;
+ const int tv_fixed_size = 31;
+
int tv_size = this->args_.size() + tv_fixed_size;
ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
tv[i].tv_u.tv_val = LDPO_REL;
else if (parameters->options().shared())
tv[i].tv_u.tv_val = LDPO_DYN;
+ else if (parameters->options().pie())
+ tv[i].tv_u.tv_val = LDPO_PIE;
else
tv[i].tv_u.tv_val = LDPO_EXEC;
tv[i].tv_tag = LDPT_GET_INPUT_FILE;
tv[i].tv_u.tv_get_input_file = get_input_file;
+ ++i;
+ tv[i].tv_tag = LDPT_GET_VIEW;
+ tv[i].tv_u.tv_get_view = get_view;
+
++i;
tv[i].tv_tag = LDPT_RELEASE_INPUT_FILE;
tv[i].tv_u.tv_release_input_file = release_input_file;
tv[i].tv_tag = LDPT_GET_SYMBOLS;
tv[i].tv_u.tv_get_symbols = get_symbols;
+ ++i;
+ tv[i].tv_tag = LDPT_GET_SYMBOLS_V2;
+ tv[i].tv_u.tv_get_symbols = get_symbols_v2;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_SYMBOLS_V3;
+ tv[i].tv_u.tv_get_symbols = get_symbols_v3;
+
++i;
tv[i].tv_tag = LDPT_ADD_INPUT_FILE;
tv[i].tv_u.tv_add_input_file = add_input_file;
tv[i].tv_tag = LDPT_SET_EXTRA_LIBRARY_PATH;
tv[i].tv_u.tv_set_extra_library_path = set_extra_library_path;
+ ++i;
+ tv[i].tv_tag = LDPT_GET_INPUT_SECTION_COUNT;
+ tv[i].tv_u.tv_get_input_section_count = get_input_section_count;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_INPUT_SECTION_TYPE;
+ tv[i].tv_u.tv_get_input_section_type = get_input_section_type;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_INPUT_SECTION_NAME;
+ tv[i].tv_u.tv_get_input_section_name = get_input_section_name;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_INPUT_SECTION_CONTENTS;
+ tv[i].tv_u.tv_get_input_section_contents = get_input_section_contents;
+
+ ++i;
+ tv[i].tv_tag = LDPT_UPDATE_SECTION_ORDER;
+ tv[i].tv_u.tv_update_section_order = update_section_order;
+
+ ++i;
+ tv[i].tv_tag = LDPT_ALLOW_SECTION_ORDERING;
+ tv[i].tv_u.tv_allow_section_ordering = allow_section_ordering;
+
+ ++i;
+ tv[i].tv_tag = LDPT_ALLOW_UNIQUE_SEGMENT_FOR_SECTIONS;
+ tv[i].tv_u.tv_allow_unique_segment_for_sections
+ = allow_unique_segment_for_sections;
+
+ ++i;
+ tv[i].tv_tag = LDPT_UNIQUE_SEGMENT_FOR_SECTIONS;
+ tv[i].tv_u.tv_unique_segment_for_sections = unique_segment_for_sections;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_INPUT_SECTION_ALIGNMENT;
+ tv[i].tv_u.tv_get_input_section_alignment = get_input_section_alignment;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_INPUT_SECTION_SIZE;
+ tv[i].tv_u.tv_get_input_section_size = get_input_section_size;
+
+ ++i;
+ tv[i].tv_tag = LDPT_REGISTER_NEW_INPUT_HOOK;
+ tv[i].tv_u.tv_register_new_input = register_new_input;
+
+ ++i;
+ tv[i].tv_tag = LDPT_GET_WRAP_SYMBOLS;
+ tv[i].tv_u.tv_get_wrap_symbols = get_wrap_symbols;
+
++i;
tv[i].tv_tag = LDPT_NULL;
tv[i].tv_u.tv_val = 0;
(*this->all_symbols_read_handler_)();
}
+// Call the new_input handler.
+
+inline void
+Plugin::new_input(struct ld_plugin_input_file* plugin_input_file)
+{
+ if (this->new_input_handler_ != NULL)
+ (*this->new_input_handler_)(plugin_input_file);
+}
+
// Call the cleanup handler.
inline void
Task_token* next_blocker_;
};
+// Plugin_recorder logs plugin actions and saves intermediate files
+// for later replay.
+
+class Plugin_recorder
+{
+ public:
+ Plugin_recorder() : file_count_(0), tempdir_(NULL), logfile_(NULL)
+ { }
+
+ bool
+ init();
+
+ void
+ claimed_file(const std::string& obj_name, off_t offset, off_t filesize,
+ const std::string& plugin_name);
+
+ void
+ unclaimed_file(const std::string& obj_name, off_t offset, off_t filesize);
+
+ void
+ replacement_file(const char* name, bool is_lib);
+
+ void
+ record_symbols(const Object* obj, int nsyms,
+ const struct ld_plugin_symbol* syms);
+
+ void
+ finish()
+ { ::fclose(this->logfile_); }
+
+ private:
+ unsigned int file_count_;
+ const char* tempdir_;
+ FILE* logfile_;
+};
+
+bool
+Plugin_recorder::init()
+{
+ // Create a temporary directory where we can stash the log and
+ // copies of replacement files.
+ char dir_template[] = "gold-recording-XXXXXX";
+#ifdef HAVE_MKDTEMP
+ if (mkdtemp(dir_template) == NULL)
+ return false;
+#else
+ if (mktemp(dir_template) == NULL)
+ return false;
+#if defined (_WIN32) && !defined (__CYGWIN32__)
+ if (mkdir(dir_template) != 0)
+ return false;
+#else
+ if (mkdir(dir_template, 0700) != 0)
+ return false;
+#endif
+#endif
+
+ size_t len = strlen(dir_template) + 1;
+ char* tempdir = new char[len];
+ strncpy(tempdir, dir_template, len);
+
+ // Create the log file.
+ std::string logname(tempdir);
+ logname.append("/log");
+ FILE* logfile = ::fopen(logname.c_str(), "w");
+ if (logfile == NULL)
+ return false;
+
+ this->tempdir_ = tempdir;
+ this->logfile_ = logfile;
+
+ gold_info(_("%s: recording to %s"), program_name, this->tempdir_);
+
+ return true;
+}
+
+void
+Plugin_recorder::claimed_file(const std::string& obj_name,
+ off_t offset,
+ off_t filesize,
+ const std::string& plugin_name)
+{
+ fprintf(this->logfile_, "PLUGIN: %s\n", plugin_name.c_str());
+ fprintf(this->logfile_, "CLAIMED: %s", obj_name.c_str());
+ if (offset > 0)
+ fprintf(this->logfile_, " @%ld", static_cast<long>(offset));
+ fprintf(this->logfile_, " %ld\n", static_cast<long>(filesize));
+}
+
+void
+Plugin_recorder::unclaimed_file(const std::string& obj_name,
+ off_t offset,
+ off_t filesize)
+{
+ fprintf(this->logfile_, "UNCLAIMED: %s", obj_name.c_str());
+ if (offset > 0)
+ fprintf(this->logfile_, " @%ld", static_cast<long>(offset));
+ fprintf(this->logfile_, " %ld\n", static_cast<long>(filesize));
+}
+
+// Make a hard link to INNAME from OUTNAME, if possible.
+// If not, copy the file.
+
+static bool
+link_or_copy_file(const char* inname, const char* outname)
+{
+ static char buf[4096];
+
+#ifdef HAVE_LINK
+ if (::link(inname, outname) == 0)
+ return true;
+#endif
+
+ int in = ::open(inname, O_RDONLY);
+ if (in < 0)
+ {
+ gold_warning(_("%s: can't open (%s)"), inname, strerror(errno));
+ return false;
+ }
+ int out = ::open(outname, O_CREAT | O_TRUNC | O_WRONLY, 0600);
+ if (out < 0)
+ {
+ gold_warning(_("%s: can't create (%s)"), outname, strerror(errno));
+ ::close(in);
+ return false;
+ }
+ ssize_t len;
+ while ((len = ::read(in, buf, sizeof(buf))) > 0)
+ {
+ if (::write(out, buf, len) != len)
+ {
+ gold_warning(_("%s: write error while making copy of file (%s)"),
+ inname, strerror(errno));
+ break;
+ }
+ }
+ ::close(in);
+ ::close(out);
+ return true;
+}
+
+void
+Plugin_recorder::replacement_file(const char* name, bool is_lib)
+{
+ fprintf(this->logfile_, "REPLACEMENT: %s", name);
+ if (is_lib)
+ fprintf(this->logfile_, "(lib)");
+ else
+ {
+ char counter[10];
+ const char* basename = lbasename(name);
+ snprintf(counter, sizeof(counter), "%05d", this->file_count_);
+ ++this->file_count_;
+ std::string outname(this->tempdir_);
+ outname.append("/");
+ outname.append(counter);
+ outname.append("-");
+ outname.append(basename);
+ if (link_or_copy_file(name, outname.c_str()))
+ fprintf(this->logfile_, " -> %s", outname.c_str());
+ }
+ fprintf(this->logfile_, "\n");
+}
+
+void
+Plugin_recorder::record_symbols(const Object* obj, int nsyms,
+ const struct ld_plugin_symbol* syms)
+{
+ fprintf(this->logfile_, "SYMBOLS: %d %s\n", nsyms, obj->name().c_str());
+ for (int i = 0; i < nsyms; ++i)
+ {
+ const struct ld_plugin_symbol* isym = &syms[i];
+
+ const char* def;
+ switch (isym->def)
+ {
+ case LDPK_DEF:
+ def = "D";
+ break;
+ case LDPK_WEAKDEF:
+ def = "WD";
+ break;
+ case LDPK_UNDEF:
+ def = "U";
+ break;
+ case LDPK_WEAKUNDEF:
+ def = "WU";
+ break;
+ case LDPK_COMMON:
+ def = "C";
+ break;
+ default:
+ def = "?";
+ break;
+ }
+
+ char vis;
+ switch (isym->visibility)
+ {
+ case LDPV_PROTECTED:
+ vis = 'P';
+ break;
+ case LDPV_INTERNAL:
+ vis = 'I';
+ break;
+ case LDPV_HIDDEN:
+ vis = 'H';
+ break;
+ case LDPV_DEFAULT:
+ vis = 'D';
+ break;
+ default:
+ vis = '?';
+ break;
+ }
+
+ fprintf(this->logfile_, " %5d: %-2s %c %s", i, def, vis, isym->name);
+ if (isym->version != NULL && isym->version[0] != '\0')
+ fprintf(this->logfile_, "@%s", isym->version);
+ if (isym->comdat_key != NULL && isym->comdat_key[0] != '\0')
+ {
+ if (strcmp(isym->name, isym->comdat_key) == 0)
+ fprintf(this->logfile_, " [comdat]");
+ else
+ fprintf(this->logfile_, " [comdat: %s]", isym->comdat_key);
+ }
+ fprintf(this->logfile_, "\n");
+ }
+}
+
// Plugin_manager methods.
Plugin_manager::~Plugin_manager()
++obj)
delete *obj;
this->objects_.clear();
+ delete this->lock_;
+ delete this->recorder_;
}
// Load all plugin libraries.
void
-Plugin_manager::load_plugins()
+Plugin_manager::load_plugins(Layout* layout)
{
+ this->layout_ = layout;
+
+ if (is_debugging_enabled(DEBUG_PLUGIN))
+ {
+ this->recorder_ = new Plugin_recorder();
+ this->recorder_->init();
+ }
+
for (this->current_ = this->plugins_.begin();
this->current_ != this->plugins_.end();
++this->current_)
Pluginobj*
Plugin_manager::claim_file(Input_file* input_file, off_t offset,
- off_t filesize)
+ off_t filesize, Object* elf_object)
{
- if (this->in_replacement_phase_)
- return NULL;
+ bool lock_initialized = this->initialize_lock_.initialize();
+
+ gold_assert(lock_initialized);
+ Hold_lock hl(*this->lock_);
unsigned int handle = this->objects_.size();
this->input_file_ = input_file;
this->plugin_input_file_.offset = offset;
this->plugin_input_file_.filesize = filesize;
this->plugin_input_file_.handle = reinterpret_cast<void*>(handle);
+ if (elf_object != NULL)
+ this->objects_.push_back(elf_object);
+ this->in_claim_file_handler_ = true;
for (this->current_ = this->plugins_.begin();
this->current_ != this->plugins_.end();
++this->current_)
{
- if ((*this->current_)->claim_file(&this->plugin_input_file_))
+ // If we aren't yet in replacement phase, allow plugins to claim input
+ // files, otherwise notify the plugin of the new input file, if needed.
+ if (!this->in_replacement_phase_)
{
- this->any_claimed_ = true;
+ if ((*this->current_)->claim_file(&this->plugin_input_file_))
+ {
+ this->any_claimed_ = true;
+ this->in_claim_file_handler_ = false;
+
+ if (this->recorder_ != NULL)
+ {
+ const std::string& objname = (elf_object == NULL
+ ? input_file->filename()
+ : elf_object->name());
+ this->recorder_->claimed_file(objname,
+ offset, filesize,
+ (*this->current_)->filename());
+ }
- if (this->objects_.size() > handle)
- return this->objects_[handle];
+ if (this->objects_.size() > handle
+ && this->objects_[handle]->pluginobj() != NULL)
+ return this->objects_[handle]->pluginobj();
- // If the plugin claimed the file but did not call the
- // add_symbols callback, we need to create the Pluginobj now.
- Pluginobj* obj = this->make_plugin_object(handle);
- return obj;
+ // If the plugin claimed the file but did not call the
+ // add_symbols callback, we need to create the Pluginobj now.
+ Pluginobj* obj = this->make_plugin_object(handle);
+ return obj;
+ }
+ }
+ else
+ {
+ (*this->current_)->new_input(&this->plugin_input_file_);
}
}
+ this->in_claim_file_handler_ = false;
+
+ if (this->recorder_ != NULL)
+ this->recorder_->unclaimed_file(input_file->filename(), offset, filesize);
+
return NULL;
}
void
Plugin_manager::all_symbols_read(Workqueue* workqueue, Task* task,
Input_objects* input_objects,
- Symbol_table* symtab, Layout* layout,
+ Symbol_table* symtab,
Dirsearch* dirpath, Mapfile* mapfile,
Task_token** last_blocker)
{
this->task_ = task;
this->input_objects_ = input_objects;
this->symtab_ = symtab;
- this->layout_ = layout;
this->dirpath_ = dirpath;
this->mapfile_ = mapfile;
this->this_blocker_ = NULL;
+ // Set symbols used in defsym expressions as seen in real ELF.
+ Layout *layout = parameters->options().plugins()->layout();
+ layout->script_options()->set_defsym_uses_in_real_elf(symtab);
+ layout->script_options()->find_defsym_defs(this->defsym_defines_set_);
+
for (this->current_ = this->plugins_.begin();
this->current_ != this->plugins_.end();
++this->current_)
void
Plugin_manager::cleanup()
{
+ if (this->any_added_)
+ {
+ // If any input files were added, close all the input files.
+ // This is because the plugin may want to remove them, and on
+ // Windows you are not allowed to remove an open file.
+ close_all_descriptors();
+ }
+
for (this->current_ = this->plugins_.begin();
this->current_ != this->plugins_.end();
++this->current_)
Plugin_manager::make_plugin_object(unsigned int handle)
{
// Make sure we aren't asked to make an object for the same handle twice.
- if (this->objects_.size() != handle)
+ if (this->objects_.size() != handle
+ && this->objects_[handle]->pluginobj() != NULL)
return NULL;
- Pluginobj* obj = make_sized_plugin_object(this->input_file_,
+ const std::string* filename = &this->input_file_->filename();
+
+ // If the elf object for this file was pushed into the objects_ vector,
+ // use its filename, then delete it to make room for the Pluginobj as
+ // this file is claimed.
+ if (this->objects_.size() != handle)
+ {
+ filename = &this->objects_.back()->name();
+ this->objects_.pop_back();
+ }
+
+ Pluginobj* obj = make_sized_plugin_object(*filename,
+ this->input_file_,
this->plugin_input_file_.offset,
this->plugin_input_file_.filesize);
+
+
+
this->objects_.push_back(obj);
return obj;
}
Plugin_manager::get_input_file(unsigned int handle,
struct ld_plugin_input_file* file)
{
- Pluginobj* obj = this->object(handle);
+ Pluginobj* obj = this->object(handle)->pluginobj();
if (obj == NULL)
return LDPS_BAD_HANDLE;
ld_plugin_status
Plugin_manager::release_input_file(unsigned int handle)
{
- Pluginobj* obj = this->object(handle);
+ if (this->object(handle) == NULL)
+ return LDPS_BAD_HANDLE;
+
+ Pluginobj* obj = this->object(handle)->pluginobj();
+
if (obj == NULL)
return LDPS_BAD_HANDLE;
return LDPS_OK;
}
+// Get the elf object corresponding to the handle. Return NULL if we
+// found a Pluginobj instead.
+
+Object*
+Plugin_manager::get_elf_object(const void* handle)
+{
+ Object* obj = this->object(
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
+
+ // The object should not be a Pluginobj.
+ if (obj == NULL
+ || obj->pluginobj() != NULL)
+ return NULL;
+
+ return obj;
+}
+
+ld_plugin_status
+Plugin_manager::get_view(unsigned int handle, const void **viewp)
+{
+ off_t offset;
+ size_t filesize;
+ Input_file *input_file;
+ if (this->in_claim_file_handler_)
+ {
+ // We are being called from the claim_file hook.
+ const struct ld_plugin_input_file &f = this->plugin_input_file_;
+ offset = f.offset;
+ filesize = f.filesize;
+ input_file = this->input_file_;
+ }
+ else
+ {
+ // An already claimed file.
+ if (this->object(handle) == NULL)
+ return LDPS_BAD_HANDLE;
+ Pluginobj* obj = this->object(handle)->pluginobj();
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+ offset = obj->offset();
+ filesize = obj->filesize();
+ input_file = obj->input_file();
+ }
+ *viewp = (void*) input_file->file().get_view(offset, 0, filesize, false,
+ false);
+ return LDPS_OK;
+}
+
// Add a new library path.
ld_plugin_status
if (parameters->incremental())
gold_error(_("input files added by plug-ins in --incremental mode not "
"supported yet"));
+
+ if (this->recorder_ != NULL)
+ this->recorder_->replacement_file(pathname, is_lib);
+
this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
this->symtab_,
this->layout_,
{
}
-// Return TRUE if a defined symbol might be reachable from outside the
-// universe of claimed objects.
+// Return TRUE if a defined symbol is referenced from outside the
+// universe of claimed objects. Only references from relocatable,
+// non-IR (unclaimed) objects count as a reference. References from
+// dynamic objects count only as "visible".
static inline bool
-is_visible_from_outside(Symbol* lsym)
+is_referenced_from_outside(Symbol* lsym)
{
if (lsym->in_real_elf())
return true;
return true;
if (parameters->options().is_undefined(lsym->name()))
return true;
- if (parameters->options().export_dynamic() || parameters->options().shared())
+ return false;
+}
+
+// Return TRUE if a defined symbol might be reachable from outside the
+// load module.
+
+static inline bool
+is_visible_from_outside(Symbol* lsym)
+{
+ if (lsym->in_dyn())
+ return true;
+ if (parameters->options().export_dynamic() || parameters->options().shared()
+ || parameters->options().in_dynamic_list(lsym->name())
+ || parameters->options().is_export_dynamic_symbol(lsym->name()))
return lsym->is_externally_visible();
return false;
}
// Get symbol resolution info.
ld_plugin_status
-Pluginobj::get_symbol_resolution_info(int nsyms, ld_plugin_symbol* syms) const
+Pluginobj::get_symbol_resolution_info(Symbol_table* symtab,
+ int nsyms,
+ ld_plugin_symbol* syms,
+ int version) const
{
+ // For version 1 of this interface, we cannot use
+ // LDPR_PREVAILING_DEF_IRONLY_EXP, so we return LDPR_PREVAILING_DEF
+ // instead.
+ const ld_plugin_symbol_resolution ldpr_prevailing_def_ironly_exp
+ = (version > 1
+ ? LDPR_PREVAILING_DEF_IRONLY_EXP
+ : LDPR_PREVAILING_DEF);
+
if (nsyms > this->nsyms_)
return LDPS_NO_SYMS;
gold_assert(this->symbols_.size() == 0);
for (int i = 0; i < nsyms; i++)
syms[i].resolution = LDPR_PREEMPTED_REG;
- return LDPS_OK;
+ return version > 2 ? LDPS_NO_SYMS : LDPS_OK;
}
+ Plugin_manager* plugins = parameters->options().plugins();
for (int i = 0; i < nsyms; i++)
{
ld_plugin_symbol* isym = &syms[i];
Symbol* lsym = this->symbols_[i];
+ if (lsym->is_forwarder())
+ lsym = symtab->resolve_forwards(lsym);
ld_plugin_symbol_resolution res = LDPR_UNKNOWN;
- if (lsym->is_undefined())
- // The symbol remains undefined.
- res = LDPR_UNDEF;
+ if (plugins->is_defsym_def(lsym->name()))
+ {
+ // The symbol is redefined via defsym.
+ res = LDPR_PREEMPTED_REG;
+ }
+ else if (lsym->is_undefined())
+ {
+ // The symbol remains undefined.
+ res = LDPR_UNDEF;
+ }
else if (isym->def == LDPK_UNDEF
|| isym->def == LDPK_WEAKUNDEF
|| isym->def == LDPK_COMMON)
if (lsym->source() != Symbol::FROM_OBJECT)
res = LDPR_RESOLVED_EXEC;
else if (lsym->object()->pluginobj() == this)
- res = (is_visible_from_outside(lsym)
- ? LDPR_PREVAILING_DEF
- : LDPR_PREVAILING_DEF_IRONLY);
+ {
+ if (is_referenced_from_outside(lsym))
+ res = LDPR_PREVAILING_DEF;
+ else if (is_visible_from_outside(lsym))
+ res = ldpr_prevailing_def_ironly_exp;
+ else
+ res = LDPR_PREVAILING_DEF_IRONLY;
+ }
else if (lsym->object()->pluginobj() != NULL)
res = LDPR_RESOLVED_IR;
else if (lsym->object()->is_dynamic())
if (lsym->source() != Symbol::FROM_OBJECT)
res = LDPR_PREEMPTED_REG;
else if (lsym->object() == static_cast<const Object*>(this))
- res = (is_visible_from_outside(lsym)
- ? LDPR_PREVAILING_DEF
- : LDPR_PREVAILING_DEF_IRONLY);
+ {
+ if (is_referenced_from_outside(lsym))
+ res = LDPR_PREVAILING_DEF;
+ else if (is_visible_from_outside(lsym))
+ res = ldpr_prevailing_def_ironly_exp;
+ else
+ res = LDPR_PREVAILING_DEF_IRONLY;
+ }
else
res = (lsym->object()->pluginobj() != NULL
? LDPR_PREEMPTED_IR
elfcpp::Sym<size, big_endian> sym(symbuf);
elfcpp::Sym_write<size, big_endian> osym(symbuf);
- typedef typename elfcpp::Elf_types<size>::Elf_WXword Elf_size_type;
+ Plugin_recorder* recorder = parameters->options().plugins()->recorder();
+ if (recorder != NULL)
+ recorder->record_symbols(this, this->nsyms_, this->syms_);
this->symbols_.resize(this->nsyms_);
{
case LDPK_DEF:
case LDPK_WEAKDEF:
- shndx = elfcpp::SHN_ABS;
+ // We use an arbitrary section number for a defined symbol.
+ shndx = 1;
break;
case LDPK_COMMON:
shndx = elfcpp::SHN_COMMON;
osym.put_st_name(0);
osym.put_st_value(0);
- osym.put_st_size(static_cast<Elf_size_type>(isym->size));
+ osym.put_st_size(0);
osym.put_st_info(bind, elfcpp::STT_NOTYPE);
osym.put_st_other(vis, 0);
osym.put_st_shndx(shndx);
for (int i = 0; i < this->nsyms_; ++i)
{
const struct ld_plugin_symbol& sym = this->syms_[i];
+ if (sym.def == LDPK_UNDEF || sym.def == LDPK_WEAKUNDEF)
+ continue;
const char* name = sym.name;
Symbol* symbol;
Archive::Should_include t = Archive::should_include_member(symtab,
return Archive::SHOULD_INCLUDE_UNKNOWN;
}
+// Iterate over global symbols, calling a visitor class V for each.
+
+template<int size, bool big_endian>
+void
+Sized_pluginobj<size, big_endian>::do_for_all_global_symbols(
+ Read_symbols_data*,
+ Library_base::Symbol_visitor_base* v)
+{
+ for (int i = 0; i < this->nsyms_; ++i)
+ {
+ const struct ld_plugin_symbol& sym = this->syms_[i];
+ if (sym.def != LDPK_UNDEF)
+ v->visit(sym.name);
+ }
+}
+
+// Iterate over local symbols, calling a visitor class V for each GOT offset
+// associated with a local symbol.
+template<int size, bool big_endian>
+void
+Sized_pluginobj<size, big_endian>::do_for_all_local_got_entries(
+ Got_offset_list::Visitor*) const
+{
+ gold_unreachable();
+}
+
// Get the size of a section. Not used for plugin objects.
template<int size, bool big_endian>
template<int size, bool big_endian>
std::string
-Sized_pluginobj<size, big_endian>::do_section_name(unsigned int)
+Sized_pluginobj<size, big_endian>::do_section_name(unsigned int) const
{
gold_unreachable();
return std::string();
// Return a view of the contents of a section. Not used for plugin objects.
template<int size, bool big_endian>
-Object::Location
-Sized_pluginobj<size, big_endian>::do_section_contents(unsigned int)
+const unsigned char*
+Sized_pluginobj<size, big_endian>::do_section_contents(
+ unsigned int,
+ section_size_type*,
+ bool)
{
- Location loc(0, 0);
-
gold_unreachable();
- return loc;
+ return NULL;
}
// Return section flags. Not used for plugin objects.
return NULL;
}
-// Get symbol counts. Not used for plugin objects.
+// Get symbol counts. Don't count plugin objects; the replacement
+// files will provide the counts.
template<int size, bool big_endian>
void
-Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(const Symbol_table*,
- size_t*, size_t*) const
+Sized_pluginobj<size, big_endian>::do_get_global_symbol_counts(
+ const Symbol_table*,
+ size_t* defined,
+ size_t* used) const
{
- gold_unreachable();
+ *defined = 0;
+ *used = 0;
}
// Get symbols. Not used for plugin objects.
void
run(Workqueue*)
{
+ Plugin_manager* plugins = parameters->options().plugins();
+ gold_assert(plugins != NULL);
// We could call early cleanup handlers here.
+ if (plugins->recorder())
+ plugins->recorder()->finish();
}
std::string
Plugin_hook::run(Workqueue* workqueue)
{
gold_assert(this->options_.has_plugins());
- Symbol* start_sym;
- if (parameters->options().entry())
- start_sym = this->symtab_->lookup(parameters->options().entry());
- else
- start_sym = this->symtab_->lookup("_start");
+ Symbol* start_sym = this->symtab_->lookup(parameters->entry());
if (start_sym != NULL)
start_sym->set_in_real_elf();
this,
this->input_objects_,
this->symtab_,
- this->layout_,
this->dirpath_,
this->mapfile_,
&this->this_blocker_);
return parameters->options().plugins()->release_input_file(obj_index);
}
+static enum ld_plugin_status
+get_view(const void *handle, const void **viewp)
+{
+ gold_assert(parameters->options().has_plugins());
+ unsigned int obj_index =
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
+ return parameters->options().plugins()->get_view(obj_index, viewp);
+}
+
// Get the symbol resolution info for a plugin-claimed input file.
static enum ld_plugin_status
get_symbols(const void* handle, int nsyms, ld_plugin_symbol* syms)
{
gold_assert(parameters->options().has_plugins());
- Pluginobj* obj = parameters->options().plugins()->object(
- static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
+ Plugin_manager* plugins = parameters->options().plugins();
+ Object* obj = plugins->object(
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
if (obj == NULL)
return LDPS_ERR;
- return obj->get_symbol_resolution_info(nsyms, syms);
+ Pluginobj* plugin_obj = obj->pluginobj();
+ if (plugin_obj == NULL)
+ return LDPS_ERR;
+ Symbol_table* symtab = plugins->symtab();
+ return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 1);
+}
+
+// Version 2 of the above. The only difference is that this version
+// is allowed to return the resolution code LDPR_PREVAILING_DEF_IRONLY_EXP.
+
+static enum ld_plugin_status
+get_symbols_v2(const void* handle, int nsyms, ld_plugin_symbol* syms)
+{
+ gold_assert(parameters->options().has_plugins());
+ Plugin_manager* plugins = parameters->options().plugins();
+ Object* obj = plugins->object(
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
+ if (obj == NULL)
+ return LDPS_ERR;
+ Pluginobj* plugin_obj = obj->pluginobj();
+ if (plugin_obj == NULL)
+ return LDPS_ERR;
+ Symbol_table* symtab = plugins->symtab();
+ return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 2);
+}
+
+// Version 3 of the above. The only difference from v2 is that it
+// returns LDPS_NO_SYMS instead of LDPS_OK for the objects we never
+// decided to include.
+
+static enum ld_plugin_status
+get_symbols_v3(const void* handle, int nsyms, ld_plugin_symbol* syms)
+{
+ gold_assert(parameters->options().has_plugins());
+ Plugin_manager* plugins = parameters->options().plugins();
+ Object* obj = plugins->object(
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle)));
+ if (obj == NULL)
+ return LDPS_ERR;
+ Pluginobj* plugin_obj = obj->pluginobj();
+ if (plugin_obj == NULL)
+ return LDPS_ERR;
+ Symbol_table* symtab = plugins->symtab();
+ return plugin_obj->get_symbol_resolution_info(symtab, nsyms, syms, 3);
}
// Add a new (real) input file generated by a plugin.
return LDPS_OK;
}
+// Get the section count of the object corresponding to the handle. This
+// plugin interface can only be called in the claim_file handler of the plugin.
+
+static enum ld_plugin_status
+get_input_section_count(const void* handle, unsigned int* count)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (!parameters->options().plugins()->in_claim_file_handler())
+ return LDPS_ERR;
+
+ Object* obj = parameters->options().plugins()->get_elf_object(handle);
+
+ if (obj == NULL)
+ return LDPS_ERR;
+
+ *count = obj->shnum();
+ return LDPS_OK;
+}
+
+// Get the type of the specified section in the object corresponding
+// to the handle. This plugin interface can only be called in the
+// claim_file handler of the plugin.
+
+static enum ld_plugin_status
+get_input_section_type(const struct ld_plugin_section section,
+ unsigned int* type)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (!parameters->options().plugins()->in_claim_file_handler())
+ return LDPS_ERR;
+
+ Object* obj
+ = parameters->options().plugins()->get_elf_object(section.handle);
+
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ *type = obj->section_type(section.shndx);
+ return LDPS_OK;
+}
+
+// Get the name of the specified section in the object corresponding
+// to the handle. This plugin interface can only be called in the
+// claim_file handler of the plugin.
+
+static enum ld_plugin_status
+get_input_section_name(const struct ld_plugin_section section,
+ char** section_name_ptr)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (!parameters->options().plugins()->in_claim_file_handler())
+ return LDPS_ERR;
+
+ Object* obj
+ = parameters->options().plugins()->get_elf_object(section.handle);
+
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ // Check if the object is locked before getting the section name.
+ gold_assert(obj->is_locked());
+
+ const std::string section_name = obj->section_name(section.shndx);
+ *section_name_ptr = static_cast<char*>(malloc(section_name.length() + 1));
+ memcpy(*section_name_ptr, section_name.c_str(), section_name.length() + 1);
+ return LDPS_OK;
+}
+
+// Get the contents of the specified section in the object corresponding
+// to the handle. This plugin interface can only be called in the
+// claim_file handler of the plugin.
+
+static enum ld_plugin_status
+get_input_section_contents(const struct ld_plugin_section section,
+ const unsigned char** section_contents_ptr,
+ size_t* len)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (!parameters->options().plugins()->in_claim_file_handler())
+ return LDPS_ERR;
+
+ Object* obj
+ = parameters->options().plugins()->get_elf_object(section.handle);
+
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ // Check if the object is locked before getting the section contents.
+ gold_assert(obj->is_locked());
+
+ section_size_type plen;
+ *section_contents_ptr
+ = obj->section_contents(section.shndx, &plen, false);
+ *len = plen;
+ return LDPS_OK;
+}
+
+// Get the alignment of the specified section in the object corresponding
+// to the handle. This plugin interface can only be called in the
+// claim_file handler of the plugin.
+
+static enum ld_plugin_status
+get_input_section_alignment(const struct ld_plugin_section section,
+ unsigned int* addralign)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (!parameters->options().plugins()->in_claim_file_handler())
+ return LDPS_ERR;
+
+ Object* obj
+ = parameters->options().plugins()->get_elf_object(section.handle);
+
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ *addralign = obj->section_addralign(section.shndx);
+ return LDPS_OK;
+}
+
+// Get the size of the specified section in the object corresponding
+// to the handle. This plugin interface can only be called in the
+// claim_file handler of the plugin.
+
+static enum ld_plugin_status
+get_input_section_size(const struct ld_plugin_section section,
+ uint64_t* secsize)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (!parameters->options().plugins()->in_claim_file_handler())
+ return LDPS_ERR;
+
+ Object* obj
+ = parameters->options().plugins()->get_elf_object(section.handle);
+
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ *secsize = obj->section_size(section.shndx);
+ return LDPS_OK;
+}
+
+static enum ld_plugin_status
+get_wrap_symbols(uint64_t *count, const char ***wrap_symbols)
+{
+ gold_assert(parameters->options().has_plugins());
+ *count = parameters->options().wrap_size();
+
+ if (*count == 0)
+ return LDPS_OK;
+
+ *wrap_symbols = new const char *[*count];
+ int i = 0;
+ for (options::String_set::const_iterator
+ it = parameters->options().wrap_begin();
+ it != parameters->options().wrap_end(); ++it, ++i) {
+ (*wrap_symbols)[i] = it->c_str();
+ }
+ return LDPS_OK;
+}
+
+
+// Specify the ordering of sections in the final layout. The sections are
+// specified as (handle,shndx) pairs in the two arrays in the order in
+// which they should appear in the final layout.
+
+static enum ld_plugin_status
+update_section_order(const struct ld_plugin_section* section_list,
+ unsigned int num_sections)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (num_sections == 0)
+ return LDPS_OK;
+
+ if (section_list == NULL)
+ return LDPS_ERR;
+
+ Layout* layout = parameters->options().plugins()->layout();
+ gold_assert (layout != NULL);
+
+ std::map<Section_id, unsigned int>* order_map
+ = layout->get_section_order_map();
+
+ /* Store the mapping from Section_id to section position in layout's
+ order_map to consult after output sections are added. */
+ for (unsigned int i = 0; i < num_sections; ++i)
+ {
+ Object* obj = parameters->options().plugins()->get_elf_object(
+ section_list[i].handle);
+ if (obj == NULL || obj->is_dynamic())
+ return LDPS_BAD_HANDLE;
+ unsigned int shndx = section_list[i].shndx;
+ Section_id secn_id(static_cast<Relobj*>(obj), shndx);
+ (*order_map)[secn_id] = i + 1;
+ }
+
+ return LDPS_OK;
+}
+
+// Let the linker know that the sections could be reordered.
+
+static enum ld_plugin_status
+allow_section_ordering()
+{
+ gold_assert(parameters->options().has_plugins());
+ Layout* layout = parameters->options().plugins()->layout();
+ layout->set_section_ordering_specified();
+ return LDPS_OK;
+}
+
+// Let the linker know that a subset of sections could be mapped
+// to a unique segment.
+
+static enum ld_plugin_status
+allow_unique_segment_for_sections()
+{
+ gold_assert(parameters->options().has_plugins());
+ Layout* layout = parameters->options().plugins()->layout();
+ layout->set_unique_segment_for_sections_specified();
+ return LDPS_OK;
+}
+
+// This function should map the list of sections specified in the
+// SECTION_LIST to a unique segment. ELF segments do not have names
+// and the NAME is used to identify Output Section which should contain
+// the list of sections. This Output Section will then be mapped to
+// a unique segment. FLAGS is used to specify if any additional segment
+// flags need to be set. For instance, a specific segment flag can be
+// set to identify this segment. Unsetting segment flags is not possible.
+// ALIGN specifies the alignment of the segment.
+
+static enum ld_plugin_status
+unique_segment_for_sections(const char* segment_name,
+ uint64_t flags,
+ uint64_t align,
+ const struct ld_plugin_section* section_list,
+ unsigned int num_sections)
+{
+ gold_assert(parameters->options().has_plugins());
+
+ if (num_sections == 0)
+ return LDPS_OK;
+
+ if (section_list == NULL)
+ return LDPS_ERR;
+
+ Layout* layout = parameters->options().plugins()->layout();
+ gold_assert (layout != NULL);
+
+ Layout::Unique_segment_info* s = new Layout::Unique_segment_info;
+ s->name = segment_name;
+ s->flags = flags;
+ s->align = align;
+
+ for (unsigned int i = 0; i < num_sections; ++i)
+ {
+ Object* obj = parameters->options().plugins()->get_elf_object(
+ section_list[i].handle);
+ if (obj == NULL || obj->is_dynamic())
+ return LDPS_BAD_HANDLE;
+ unsigned int shndx = section_list[i].shndx;
+ Const_section_id secn_id(static_cast<Relobj*>(obj), shndx);
+ layout->insert_section_segment_map(secn_id, s);
+ }
+
+ return LDPS_OK;
+}
+
+// Register a new_input handler.
+
+static enum ld_plugin_status
+register_new_input(ld_plugin_new_input_handler handler)
+{
+ gold_assert(parameters->options().has_plugins());
+ parameters->options().plugins()->set_new_input_handler(handler);
+ return LDPS_OK;
+}
+
#endif // ENABLE_PLUGINS
// Allocate a Pluginobj object of the appropriate size and endianness.
static Pluginobj*
-make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
+make_sized_plugin_object(const std::string& filename,
+ Input_file* input_file, off_t offset, off_t filesize)
{
Pluginobj* obj = NULL;
{
if (target.is_big_endian())
#ifdef HAVE_TARGET_32_BIG
- obj = new Sized_pluginobj<32, true>(input_file->filename(),
- input_file, offset, filesize);
+ obj = new Sized_pluginobj<32, true>(filename, input_file,
+ offset, filesize);
#else
gold_error(_("%s: not configured to support "
"32-bit big-endian object"),
- input_file->filename().c_str());
+ filename.c_str());
#endif
else
#ifdef HAVE_TARGET_32_LITTLE
- obj = new Sized_pluginobj<32, false>(input_file->filename(),
- input_file, offset, filesize);
+ obj = new Sized_pluginobj<32, false>(filename, input_file,
+ offset, filesize);
#else
gold_error(_("%s: not configured to support "
"32-bit little-endian object"),
- input_file->filename().c_str());
+ filename.c_str());
#endif
}
else if (target.get_size() == 64)
{
if (target.is_big_endian())
#ifdef HAVE_TARGET_64_BIG
- obj = new Sized_pluginobj<64, true>(input_file->filename(),
- input_file, offset, filesize);
+ obj = new Sized_pluginobj<64, true>(filename, input_file,
+ offset, filesize);
#else
gold_error(_("%s: not configured to support "
"64-bit big-endian object"),
- input_file->filename().c_str());
+ filename.c_str());
#endif
else
#ifdef HAVE_TARGET_64_LITTLE
- obj = new Sized_pluginobj<64, false>(input_file->filename(),
- input_file, offset, filesize);
+ obj = new Sized_pluginobj<64, false>(filename, input_file,
+ offset, filesize);
#else
gold_error(_("%s: not configured to support "
"64-bit little-endian object"),
- input_file->filename().c_str());
+ filename.c_str());
#endif
}
projects / deliverable / binutils-gdb.git / blobdiff