X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=gold%2Ftarget-select.cc;h=f47d79c6c19f4ac93c80efbbec3afac28f76891f;hb=873657b9e824943ae44c12966c29cbbcd21c986f;hp=dcd3017f07c31694d77b9a77589b7120ab858ce8;hpb=2ea97941102380c28117882600265c1187c6fc8b;p=deliverable%2Fbinutils-gdb.git diff --git a/gold/target-select.cc b/gold/target-select.cc index dcd3017f07..f47d79c6c1 100644 --- a/gold/target-select.cc +++ b/gold/target-select.cc @@ -1,6 +1,6 @@ // target-select.cc -- select a target for an object file -// Copyright 2006, 2007, 2008 Free Software Foundation, Inc. +// Copyright (C) 2006-2020 Free Software Foundation, Inc. // Written by Ian Lance Taylor . // This file is part of gold. @@ -22,9 +22,12 @@ #include "gold.h" +#include #include #include "elfcpp.h" +#include "options.h" +#include "parameters.h" #include "target-select.h" namespace @@ -39,44 +42,65 @@ gold::Target_selector* target_selectors; namespace gold { +// Class Set_target_once. + +void +Set_target_once::do_run_once(void*) +{ + this->target_selector_->set_target(); +} + // Construct a Target_selector, which means adding it to the linked // list. This runs at global constructor time, so we want it to be // fast. Target_selector::Target_selector(int machine, int size, bool is_big_endian, - const char* bfd_name) + const char* bfd_name, const char* emulation) : machine_(machine), size_(size), is_big_endian_(is_big_endian), - bfd_name_(bfd_name), instantiated_target_(NULL), lock_(NULL), - initialize_lock_(&this->lock_) - + bfd_name_(bfd_name), emulation_(emulation), instantiated_target_(NULL), + set_target_once_(this) { this->next_ = target_selectors; target_selectors = this; } -// Instantiate the target and return it. Use a lock to avoid -// instantiating two instances of the same target. +// Instantiate the target and return it. Use SET_TARGET_ONCE_ to +// avoid instantiating two instances of the same target. Target* Target_selector::instantiate_target() { - // We assume that the pointer will either be written entirely or not - // at all. - if (this->instantiated_target_ == NULL) - { - this->initialize_lock_.initialize(); - Hold_optional_lock hl(this->lock_); - if (this->instantiated_target_ == NULL) - this->instantiated_target_ = this->do_instantiate_target(); - } + this->set_target_once_.run_once(NULL); return this->instantiated_target_; } +// Instantiate the target. This is called at most once. + +void +Target_selector::set_target() +{ + gold_assert(this->instantiated_target_ == NULL); + this->instantiated_target_ = this->do_instantiate_target(); +} + +// If we instantiated TARGET, return the corresponding BFD name. + +const char* +Target_selector::do_target_bfd_name(const Target* target) +{ + if (!this->is_our_target(target)) + return NULL; + const char* my_bfd_name = this->bfd_name(); + gold_assert(my_bfd_name != NULL); + return my_bfd_name; +} + // Find the target for an ELF file. Target* -select_target(int machine, int size, bool is_big_endian, int osabi, - int abiversion) +select_target(Input_file* input_file, off_t offset, + int machine, int size, bool is_big_endian, + int osabi, int abiversion) { for (Target_selector* p = target_selectors; p != NULL; p = p->next()) { @@ -85,7 +109,8 @@ select_target(int machine, int size, bool is_big_endian, int osabi, && p->get_size() == size && (p->is_big_endian() ? is_big_endian : !is_big_endian)) { - Target* ret = p->recognize(machine, osabi, abiversion); + Target* ret = p->recognize(input_file, offset, + machine, osabi, abiversion); if (ret != NULL) return ret; } @@ -97,14 +122,33 @@ select_target(int machine, int size, bool is_big_endian, int osabi, // --oformat option. Target* -select_target_by_name(const char* name) +select_target_by_bfd_name(const char* name) { for (Target_selector* p = target_selectors; p != NULL; p = p->next()) { const char* pname = p->bfd_name(); if (pname == NULL || strcmp(pname, name) == 0) { - Target* ret = p->recognize_by_name(name); + Target* ret = p->recognize_by_bfd_name(name); + if (ret != NULL) + return ret; + } + } + return NULL; +} + +// Find a target using a GNU linker emulation. This is used to +// support the -m option. + +Target* +select_target_by_emulation(const char* name) +{ + for (Target_selector* p = target_selectors; p != NULL; p = p->next()) + { + const char* pname = p->emulation(); + if (pname == NULL || strcmp(pname, name) == 0) + { + Target* ret = p->recognize_by_emulation(name); if (ret != NULL) return ret; } @@ -118,7 +162,58 @@ void supported_target_names(std::vector* names) { for (Target_selector* p = target_selectors; p != NULL; p = p->next()) - p->supported_names(names); + p->supported_bfd_names(names); +} + +// Push all the supported emulations onto a vector. + +void +supported_emulation_names(std::vector* names) +{ + for (Target_selector* p = target_selectors; p != NULL; p = p->next()) + p->supported_emulations(names); +} + +// Implement the --print-output-format option. + +void +print_output_format() +{ + if (!parameters->target_valid()) + { + // This case arises when --print-output-format is used with no + // input files. We need to come up with the right string to + // print based on the other options. If the user specified the + // format using a --oformat option, use that. That saves each + // target from having to remember the name that was used to + // select it. In other cases, we will just have to ask the + // target. + if (parameters->options().user_set_oformat()) + { + const char* bfd_name = parameters->options().oformat(); + Target* target = select_target_by_bfd_name(bfd_name); + if (target != NULL) + printf("%s\n", bfd_name); + else + gold_error(_("unrecognized output format %s"), bfd_name); + return; + } + + parameters_force_valid_target(); + } + + const Target* target = ¶meters->target(); + for (Target_selector* p = target_selectors; p != NULL; p = p->next()) + { + const char* bfd_name = p->target_bfd_name(target); + if (bfd_name != NULL) + { + printf("%s\n", bfd_name); + return; + } + } + + gold_unreachable(); } } // End namespace gold.