-// plugin.c -- plugin manager for gold -*- C++ -*-
+// plugin.cc -- plugin manager for gold -*- C++ -*-
-// Copyright 2008 Free Software Foundation, Inc.
+// Copyright 2008, 2009, 2010, 2011, 2012, 2013 Free Software Foundation, Inc.
// This file is part of gold.
// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
// MA 02110-1301, USA.
+#include "gold.h"
+
#include <cstdio>
#include <cstdarg>
#include <cstring>
#include <string>
#include <vector>
+
+#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 "gold.h"
#include "parameters.h"
#include "errors.h"
#include "fileread.h"
#include "target.h"
#include "readsyms.h"
#include "symtab.h"
+#include "descriptors.h"
#include "elfcpp.h"
namespace gold
static enum ld_plugin_status
add_symbols(void *handle, int nsyms, const struct ld_plugin_symbol *syms);
+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
-add_input_file(char *pathname);
+get_symbols_v2(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
+add_input_library(const char *pathname);
+
+static enum ld_plugin_status
+set_extra_library_path(const char *path);
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);
};
#endif // ENABLE_PLUGINS
static Pluginobj* make_sized_plugin_object(Input_file* input_file,
- off_t offset);
+ off_t offset, off_t filesize);
// Plugin methods.
this->handle_ = dlopen(this->filename_.c_str(), RTLD_NOW);
if (this->handle_ == NULL)
{
- gold_error(_("%s: could not load plugin library"),
- this->filename_.c_str());
+ gold_error(_("%s: could not load plugin library: %s"),
+ this->filename_.c_str(), dlerror());
return;
}
// Find the plugin's onload entry point.
- ld_plugin_onload onload = reinterpret_cast<ld_plugin_onload>
- (dlsym(this->handle_, "onload"));
- if (onload == NULL)
+ void* ptr = dlsym(this->handle_, "onload");
+ if (ptr == NULL)
{
gold_error(_("%s: could not find onload entry point"),
this->filename_.c_str());
return;
}
+ ld_plugin_onload onload;
+ gold_assert(sizeof(onload) == sizeof(ptr));
+ memcpy(&onload, &ptr, sizeof(ptr));
// Get the linker's version number.
const char* ver = get_version_string();
sscanf(ver, "%d.%d", &major, &minor);
// Allocate and populate a transfer vector.
- const int tv_fixed_size = 11;
+ const int tv_fixed_size = 26;
+
int tv_size = this->args_.size() + tv_fixed_size;
- ld_plugin_tv *tv = new ld_plugin_tv[tv_size];
+ ld_plugin_tv* tv = new ld_plugin_tv[tv_size];
// Put LDPT_MESSAGE at the front of the list so the plugin can use it
// while processing subsequent entries.
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;
+ ++i;
+ tv[i].tv_tag = LDPT_OUTPUT_NAME;
+ tv[i].tv_u.tv_string = parameters->options().output();
+
for (unsigned int j = 0; j < this->args_.size(); ++j)
{
++i;
tv[i].tv_tag = LDPT_ADD_SYMBOLS;
tv[i].tv_u.tv_add_symbols = add_symbols;
+ ++i;
+ 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;
+
++i;
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_ADD_INPUT_FILE;
tv[i].tv_u.tv_add_input_file = add_input_file;
+ ++i;
+ tv[i].tv_tag = LDPT_ADD_INPUT_LIBRARY;
+ tv[i].tv_u.tv_add_input_library = add_input_library;
+
+ ++i;
+ 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_NULL;
tv[i].tv_u.tv_val = 0;
// Call the plugin claim-file handler.
inline bool
-Plugin::claim_file(struct ld_plugin_input_file *plugin_input_file)
+Plugin::claim_file(struct ld_plugin_input_file* plugin_input_file)
{
int claimed = 0;
inline void
Plugin::cleanup()
{
- if (this->cleanup_handler_ != NULL)
- (*this->cleanup_handler_)();
+ if (this->cleanup_handler_ != NULL && !this->cleanup_done_)
+ {
+ // Set this flag before calling to prevent a recursive plunge
+ // in the event that a plugin's cleanup handler issues a
+ // fatal error.
+ this->cleanup_done_ = true;
+ (*this->cleanup_handler_)();
+ }
}
+// This task is used to rescan archives as needed.
+
+class Plugin_rescan : public Task
+{
+ public:
+ Plugin_rescan(Task_token* this_blocker, Task_token* next_blocker)
+ : this_blocker_(this_blocker), next_blocker_(next_blocker)
+ { }
+
+ ~Plugin_rescan()
+ {
+ delete this->this_blocker_;
+ }
+
+ Task_token*
+ is_runnable()
+ {
+ if (this->this_blocker_->is_blocked())
+ return this->this_blocker_;
+ return NULL;
+ }
+
+ void
+ locks(Task_locker* tl)
+ { tl->add(this, this->next_blocker_); }
+
+ void
+ run(Workqueue*)
+ { parameters->options().plugins()->rescan(this); }
+
+ std::string
+ get_name() const
+ { return "Plugin_rescan"; }
+
+ private:
+ Task_token* this_blocker_;
+ Task_token* next_blocker_;
+};
+
// Plugin_manager methods.
Plugin_manager::~Plugin_manager()
// Load all plugin libraries.
void
-Plugin_manager::load_plugins()
+Plugin_manager::load_plugins(Layout* layout)
{
+ this->layout_ = layout;
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;
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();
{
if ((*this->current_)->claim_file(&this->plugin_input_file_))
{
- if (this->objects_.size() > handle)
- return this->objects_[handle];
+ this->any_claimed_ = true;
+ this->in_claim_file_handler_ = false;
+
+ 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.
}
}
+ this->in_claim_file_handler_ = false;
return NULL;
}
+// Save an archive. This is used so that a plugin can add a file
+// which refers to a symbol which was not previously referenced. In
+// that case we want to pretend that the symbol was referenced before,
+// and pull in the archive object.
+
+void
+Plugin_manager::save_archive(Archive* archive)
+{
+ if (this->in_replacement_phase_ || !this->any_claimed_)
+ delete archive;
+ else
+ this->rescannable_.push_back(Rescannable(archive));
+}
+
+// Save an Input_group. This is like save_archive.
+
+void
+Plugin_manager::save_input_group(Input_group* input_group)
+{
+ if (this->in_replacement_phase_ || !this->any_claimed_)
+ delete input_group;
+ else
+ this->rescannable_.push_back(Rescannable(input_group));
+}
+
// Call the all-symbols-read handlers.
void
-Plugin_manager::all_symbols_read(Workqueue* workqueue,
+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->in_replacement_phase_ = true;
this->workqueue_ = workqueue;
+ this->task_ = task;
this->input_objects_ = input_objects;
this->symtab_ = symtab;
- this->layout_ = layout;
this->dirpath_ = dirpath;
this->mapfile_ = mapfile;
this->this_blocker_ = NULL;
++this->current_)
(*this->current_)->all_symbols_read();
+ if (this->any_added_)
+ {
+ Task_token* next_blocker = new Task_token(true);
+ next_blocker->add_blocker();
+ workqueue->queue(new Plugin_rescan(this->this_blocker_, next_blocker));
+ this->this_blocker_ = next_blocker;
+ }
+
*last_blocker = this->this_blocker_;
}
+// This is called when we see a new undefined symbol. If we are in
+// the replacement phase, this means that we may need to rescan some
+// archives we have previously seen.
+
+void
+Plugin_manager::new_undefined_symbol(Symbol* sym)
+{
+ if (this->in_replacement_phase_)
+ this->undefined_symbols_.push_back(sym);
+}
+
+// Rescan archives as needed. This handles the case where a new
+// object file added by a plugin has an undefined reference to some
+// symbol defined in an archive.
+
+void
+Plugin_manager::rescan(Task* task)
+{
+ size_t rescan_pos = 0;
+ size_t rescan_size = this->rescannable_.size();
+ while (!this->undefined_symbols_.empty())
+ {
+ if (rescan_pos >= rescan_size)
+ {
+ this->undefined_symbols_.clear();
+ return;
+ }
+
+ Undefined_symbol_list undefs;
+ undefs.reserve(this->undefined_symbols_.size());
+ this->undefined_symbols_.swap(undefs);
+
+ size_t min_rescan_pos = rescan_size;
+
+ for (Undefined_symbol_list::const_iterator p = undefs.begin();
+ p != undefs.end();
+ ++p)
+ {
+ if (!(*p)->is_undefined())
+ continue;
+
+ this->undefined_symbols_.push_back(*p);
+
+ // Find the first rescan archive which defines this symbol,
+ // starting at the current rescan position. The rescan position
+ // exists so that given -la -lb -lc we don't look for undefined
+ // symbols in -lb back in -la, but instead get the definition
+ // from -lc. Don't bother to look past the current minimum
+ // rescan position.
+ for (size_t i = rescan_pos; i < min_rescan_pos; ++i)
+ {
+ if (this->rescannable_defines(i, *p))
+ {
+ min_rescan_pos = i;
+ break;
+ }
+ }
+ }
+
+ if (min_rescan_pos >= rescan_size)
+ {
+ // We didn't find any rescannable archives which define any
+ // undefined symbols.
+ return;
+ }
+
+ const Rescannable& r(this->rescannable_[min_rescan_pos]);
+ if (r.is_archive)
+ {
+ Task_lock_obj<Archive> tl(task, r.u.archive);
+ r.u.archive->add_symbols(this->symtab_, this->layout_,
+ this->input_objects_, this->mapfile_);
+ }
+ else
+ {
+ size_t next_saw_undefined = this->symtab_->saw_undefined();
+ size_t saw_undefined;
+ do
+ {
+ saw_undefined = next_saw_undefined;
+
+ for (Input_group::const_iterator p = r.u.input_group->begin();
+ p != r.u.input_group->end();
+ ++p)
+ {
+ Task_lock_obj<Archive> tl(task, *p);
+
+ (*p)->add_symbols(this->symtab_, this->layout_,
+ this->input_objects_, this->mapfile_);
+ }
+
+ next_saw_undefined = this->symtab_->saw_undefined();
+ }
+ while (saw_undefined != next_saw_undefined);
+ }
+
+ for (size_t i = rescan_pos; i < min_rescan_pos + 1; ++i)
+ {
+ if (this->rescannable_[i].is_archive)
+ delete this->rescannable_[i].u.archive;
+ else
+ delete this->rescannable_[i].u.input_group;
+ }
+
+ rescan_pos = min_rescan_pos + 1;
+ }
+}
+
+// Return whether the rescannable at index I defines SYM.
+
+bool
+Plugin_manager::rescannable_defines(size_t i, Symbol* sym)
+{
+ const Rescannable& r(this->rescannable_[i]);
+ if (r.is_archive)
+ return r.u.archive->defines_symbol(sym);
+ else
+ {
+ for (Input_group::const_iterator p = r.u.input_group->begin();
+ p != r.u.input_group->end();
+ ++p)
+ {
+ if ((*p)->defines_symbol(sym))
+ return true;
+ }
+ return false;
+ }
+}
+
// Layout deferred objects.
void
for (obj = this->deferred_layout_objects_.begin();
obj != this->deferred_layout_objects_.end();
++obj)
- (*obj)->layout_deferred_sections(this->layout_);
+ {
+ // Lock the object so we can read from it. This is only called
+ // single-threaded from queue_middle_tasks, so it is OK to lock.
+ // Unfortunately we have no way to pass in a Task token.
+ const Task* dummy_task = reinterpret_cast<const Task*>(-1);
+ Task_lock_obj<Object> tl(dummy_task, *obj);
+ (*obj)->layout_deferred_sections(this->layout_);
+ }
}
// Call the cleanup handlers.
void
Plugin_manager::cleanup()
{
- if (this->cleanup_done_)
- return;
+ 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_)
(*this->current_)->cleanup();
- this->cleanup_done_ = true;
}
// Make a new Pluginobj object. This is called when the plugin calls
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_,
- this->plugin_input_file_.offset);
+ this->plugin_input_file_.offset,
+ this->plugin_input_file_.filesize);
+
+
+ // If the elf object for this file was pushed into the objects_ vector, delete
+ // it to make room for the Pluginobj as this file is claimed.
+ if (this->objects_.size() != handle)
+ this->objects_.pop_back();
+
this->objects_.push_back(obj);
return obj;
}
+// Get the input file information with an open (possibly re-opened)
+// file descriptor.
+
+ld_plugin_status
+Plugin_manager::get_input_file(unsigned int handle,
+ struct ld_plugin_input_file* file)
+{
+ Pluginobj* obj = this->object(handle)->pluginobj();
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ obj->lock(this->task_);
+ file->name = obj->filename().c_str();
+ file->fd = obj->descriptor();
+ file->offset = obj->offset();
+ file->filesize = obj->filesize();
+ file->handle = reinterpret_cast<void*>(handle);
+ return LDPS_OK;
+}
+
+// Release the input file.
+
+ld_plugin_status
+Plugin_manager::release_input_file(unsigned int handle)
+{
+ if (this->object(handle) == NULL)
+ return LDPS_BAD_HANDLE;
+
+ Pluginobj* obj = this->object(handle)->pluginobj();
+
+ if (obj == NULL)
+ return LDPS_BAD_HANDLE;
+
+ obj->unlock(this->task_);
+ 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
+Plugin_manager::set_extra_library_path(const char* path)
+{
+ this->extra_search_path_ = std::string(path);
+ return LDPS_OK;
+}
+
// Add a new input file.
ld_plugin_status
-Plugin_manager::add_input_file(char *pathname)
+Plugin_manager::add_input_file(const char* pathname, bool is_lib)
{
- Input_file_argument file(pathname, false, "", false, this->options_);
+ Input_file_argument file(pathname,
+ (is_lib
+ ? Input_file_argument::INPUT_FILE_TYPE_LIBRARY
+ : Input_file_argument::INPUT_FILE_TYPE_FILE),
+ (is_lib
+ ? this->extra_search_path_.c_str()
+ : ""),
+ false,
+ this->options_);
Input_argument* input_argument = new Input_argument(file);
Task_token* next_blocker = new Task_token(true);
next_blocker->add_blocker();
- this->workqueue_->queue_soon(new Read_symbols(this->options_,
- this->input_objects_,
+ if (parameters->incremental())
+ gold_error(_("input files added by plug-ins in --incremental mode not "
+ "supported yet"));
+ this->workqueue_->queue_soon(new Read_symbols(this->input_objects_,
this->symtab_,
this->layout_,
this->dirpath_,
+ 0,
this->mapfile_,
input_argument,
NULL,
+ NULL,
this->this_blocker_,
next_blocker));
this->this_blocker_ = next_blocker;
+ this->any_added_ = true;
return LDPS_OK;
}
// Class Pluginobj.
Pluginobj::Pluginobj(const std::string& name, Input_file* input_file,
- off_t offset)
+ off_t offset, off_t filesize)
: Object(name, input_file, false, offset),
- nsyms_(0), syms_(NULL), symbols_(), comdat_map_()
+ nsyms_(0), syms_(NULL), symbols_(), filesize_(filesize), comdat_map_()
{
}
-// 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;
if (parameters->options().relocatable())
return true;
+ if (parameters->options().is_undefined(lsym->name()))
+ return true;
+ 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())
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(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;
+
+ if (static_cast<size_t>(nsyms) > this->symbols_.size())
+ {
+ // We never decided to include this object. We mark all symbols as
+ // preempted.
+ gold_assert(this->symbols_.size() == 0);
+ for (int i = 0; i < nsyms; i++)
+ syms[i].resolution = LDPR_PREEMPTED_REG;
+ return LDPS_OK;
+ }
+
for (int i = 0; i < nsyms; i++)
{
ld_plugin_symbol* isym = &syms[i];
// The original symbol was undefined or common.
if (lsym->source() != Symbol::FROM_OBJECT)
res = LDPR_RESOLVED_EXEC;
+ else if (lsym->object()->pluginobj() == this)
+ {
+ 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
// If this is the first time we've seen this comdat key, ask the
// layout object whether it should be included.
if (ins.second)
- ins.first->second = layout->add_comdat(NULL, 1, comdat_key, true);
+ ins.first->second = layout->find_or_add_kept_section(comdat_key,
+ NULL, 0, true,
+ true, NULL);
return ins.first->second;
}
Sized_pluginobj<size, big_endian>::Sized_pluginobj(
const std::string& name,
Input_file* input_file,
- off_t offset)
- : Pluginobj(name, input_file, offset)
+ off_t offset,
+ off_t filesize)
+ : Pluginobj(name, input_file, offset, filesize)
{
}
// Add the symbols to the symbol table.
-template<int size, bool big_endian>
-void
-Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table*,
- Read_symbols_data*)
-{
- gold_unreachable();
-}
-
template<int size, bool big_endian>
void
Sized_pluginobj<size, big_endian>::do_add_symbols(Symbol_table* symtab,
+ Read_symbols_data*,
Layout* layout)
{
const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
for (int i = 0; i < this->nsyms_; ++i)
{
- const struct ld_plugin_symbol *isym = &this->syms_[i];
+ const struct ld_plugin_symbol* isym = &this->syms_[i];
const char* name = isym->name;
const char* ver = isym->version;
elfcpp::Elf_Half shndx;
switch (isym->visibility)
{
case LDPV_PROTECTED:
- vis = elfcpp::STV_DEFAULT;
+ vis = elfcpp::STV_PROTECTED;
break;
case LDPV_INTERNAL:
- vis = elfcpp::STV_DEFAULT;
+ vis = elfcpp::STV_INTERNAL;
break;
case LDPV_HIDDEN:
- vis = elfcpp::STV_DEFAULT;
+ vis = elfcpp::STV_HIDDEN;
break;
case LDPV_DEFAULT:
default:
}
}
+template<int size, bool big_endian>
+Archive::Should_include
+Sized_pluginobj<size, big_endian>::do_should_include_member(
+ Symbol_table* symtab,
+ Layout* layout,
+ Read_symbols_data*,
+ std::string* why)
+{
+ char* tmpbuf = NULL;
+ size_t tmpbuflen = 0;
+
+ for (int i = 0; i < this->nsyms_; ++i)
+ {
+ const struct ld_plugin_symbol& sym = this->syms_[i];
+ const char* name = sym.name;
+ Symbol* symbol;
+ Archive::Should_include t = Archive::should_include_member(symtab,
+ layout,
+ name,
+ &symbol, why,
+ &tmpbuf,
+ &tmpbuflen);
+ if (t == Archive::SHOULD_INCLUDE_YES)
+ {
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return t;
+ }
+ }
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ 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>
// 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 0;
}
+// Return section entsize. Not used for plugin objects.
+
+template<int size, bool big_endian>
+uint64_t
+Sized_pluginobj<size, big_endian>::do_section_entsize(unsigned int)
+{
+ gold_unreachable();
+ return 0;
+}
+
// Return section address. Not used for plugin objects.
template<int size, bool big_endian>
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;
}
-// Class Add_plugin_symbols.
-
-Add_plugin_symbols::~Add_plugin_symbols()
-{
- if (this->this_blocker_ != NULL)
- delete this->this_blocker_;
- // next_blocker_ is deleted by the task associated with the next
- // input file.
-}
+// Get symbols. Not used for plugin objects.
-// We are blocked by this_blocker_. We block next_blocker_. We also
-// lock the file.
-
-Task_token*
-Add_plugin_symbols::is_runnable()
-{
- if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked())
- return this->this_blocker_;
- if (this->obj_->is_locked())
- return this->obj_->token();
- return NULL;
-}
-
-void
-Add_plugin_symbols::locks(Task_locker* tl)
-{
- tl->add(this, this->next_blocker_);
- tl->add(this, this->obj_->token());
-}
-
-// Add the symbols in the object to the symbol table.
-
-void
-Add_plugin_symbols::run(Workqueue*)
+template<int size, bool big_endian>
+const Object::Symbols*
+Sized_pluginobj<size, big_endian>::do_get_global_symbols() const
{
- this->obj_->add_symbols(this->symtab_, this->layout_);
+ gold_unreachable();
}
// Class Plugin_finish. This task runs after all replacement files have
-// been added. It calls Layout::layout for any deferred sections and
-// calls each plugin's cleanup handler.
+// been added. For now, it's a placeholder for a possible plugin API
+// to allow the plugin to release most of its resources. The cleanup
+// handlers must be called later, because they can remove the temporary
+// object files that are needed until the end of the link.
class Plugin_finish : public Task
{
void
run(Workqueue*)
{
- Plugin_manager* plugins = parameters->options().plugins();
- gold_assert(plugins != NULL);
- plugins->layout_deferred_objects();
- plugins->cleanup();
+ // We could call early cleanup handlers here.
}
std::string
Plugin_hook::run(Workqueue* workqueue)
{
gold_assert(this->options_.has_plugins());
+ Symbol* start_sym = this->symtab_->lookup(parameters->entry());
+ if (start_sym != NULL)
+ start_sym->set_in_real_elf();
+
this->options_.plugins()->all_symbols_read(workqueue,
+ this,
this->input_objects_,
this->symtab_,
- this->layout_,
this->dirpath_,
this->mapfile_,
&this->this_blocker_);
// Add symbols from a plugin-claimed input file.
static enum ld_plugin_status
-add_symbols(void* handle, int nsyms, const ld_plugin_symbol *syms)
+add_symbols(void* handle, int nsyms, const ld_plugin_symbol* syms)
{
gold_assert(parameters->options().has_plugins());
Pluginobj* obj = parameters->options().plugins()->make_plugin_object(
return LDPS_OK;
}
+// Get the input file information with an open (possibly re-opened)
+// file descriptor.
+
+static enum ld_plugin_status
+get_input_file(const void* handle, struct ld_plugin_input_file* file)
+{
+ gold_assert(parameters->options().has_plugins());
+ unsigned int obj_index =
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
+ return parameters->options().plugins()->get_input_file(obj_index, file);
+}
+
+// Release the input file.
+
+static enum ld_plugin_status
+release_input_file(const void* handle)
+{
+ gold_assert(parameters->options().has_plugins());
+ unsigned int obj_index =
+ static_cast<unsigned int>(reinterpret_cast<intptr_t>(handle));
+ 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)
+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)));
+ Object* obj = parameters->options().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;
+ return plugin_obj->get_symbol_resolution_info(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());
+ Object* obj = parameters->options().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;
+ return plugin_obj->get_symbol_resolution_info(nsyms, syms, 2);
}
// Add a new (real) input file generated by a plugin.
static enum ld_plugin_status
-add_input_file(char *pathname)
+add_input_file(const char* pathname)
{
gold_assert(parameters->options().has_plugins());
- return parameters->options().plugins()->add_input_file(pathname);
+ return parameters->options().plugins()->add_input_file(pathname, false);
+}
+
+// Add a new (real) library required by a plugin.
+
+static enum ld_plugin_status
+add_input_library(const char* pathname)
+{
+ gold_assert(parameters->options().has_plugins());
+ return parameters->options().plugins()->add_input_file(pathname, true);
+}
+
+// Set the extra library path to be used by libraries added via
+// add_input_library
+
+static enum ld_plugin_status
+set_extra_library_path(const char* path)
+{
+ gold_assert(parameters->options().has_plugins());
+ return parameters->options().plugins()->set_extra_library_path(path);
}
// Issue a diagnostic message from a plugin.
static enum ld_plugin_status
-message(int level, const char * format, ...)
+message(int level, const char* format, ...)
{
va_list args;
va_start(args, format);
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;
+}
+
+// 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)
+ return LDPS_BAD_HANDLE;
+ unsigned int shndx = section_list[i].shndx;
+ Section_id secn_id(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)
+ return LDPS_BAD_HANDLE;
+ unsigned int shndx = section_list[i].shndx;
+ Const_section_id secn_id(obj, shndx);
+ layout->insert_section_segment_map(secn_id, s);
+ }
+
+ 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)
+make_sized_plugin_object(Input_file* input_file, off_t offset, off_t filesize)
{
- Target* target;
Pluginobj* obj = NULL;
- if (parameters->target_valid())
- target = const_cast<Target*>(¶meters->target());
- else
- target = const_cast<Target*>(¶meters->default_target());
+ parameters_force_valid_target();
+ const Target& target(parameters->target());
- if (target->get_size() == 32)
+ if (target.get_size() == 32)
{
- if (target->is_big_endian())
+ if (target.is_big_endian())
#ifdef HAVE_TARGET_32_BIG
obj = new Sized_pluginobj<32, true>(input_file->filename(),
- input_file, offset);
+ input_file, offset, filesize);
#else
gold_error(_("%s: not configured to support "
"32-bit big-endian object"),
else
#ifdef HAVE_TARGET_32_LITTLE
obj = new Sized_pluginobj<32, false>(input_file->filename(),
- input_file, offset);
+ input_file, offset, filesize);
#else
gold_error(_("%s: not configured to support "
"32-bit little-endian object"),
input_file->filename().c_str());
#endif
}
- else if (target->get_size() == 64)
+ else if (target.get_size() == 64)
{
- if (target->is_big_endian())
+ if (target.is_big_endian())
#ifdef HAVE_TARGET_64_BIG
obj = new Sized_pluginobj<64, true>(input_file->filename(),
- input_file, offset);
+ input_file, offset, filesize);
#else
gold_error(_("%s: not configured to support "
"64-bit big-endian object"),
else
#ifdef HAVE_TARGET_64_LITTLE
obj = new Sized_pluginobj<64, false>(input_file->filename(),
- input_file, offset);
+ input_file, offset, filesize);
#else
gold_error(_("%s: not configured to support "
"64-bit little-endian object"),
}
gold_assert(obj != NULL);
- obj->set_target(target);
return obj;
}
projects / binutils.git / blobdiff