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authorDoug Kwan <dougkwan@google.com>2009-12-09 03:02:28 +0000
committerDoug Kwan <dougkwan@google.com>2009-12-09 03:02:28 +0000
commit4f7872716e8b73149e9024e1b95db6c3cfa66bd1 (patch)
treec33f338158eadac574de9434ef24c217bfb2cb08 /gold/attributes.cc
parent829da89821d7f0b7663b8314128fa06878d228e0 (diff)
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2009-12-08 Doug Kwan <dougkwan@google.com>
* Makefile.am (CCFILES): Add attributes.cc and int_encoding.cc. (HFILES): Add attributes.h and int_encoding.h. * Makefile.in: Regenerate. * dwarf_reader.cc (read_unsigned_LEB_128, read_signed_LEB_128): Move function definitions to int_encoding.cc * dwarf_reader.h (read_unsigned_LEB_128, read_signed_LEB_128): Move prototypes to int_encoding.h * reduced_debug_output.cc (int_encoding.h): New include. (write_unsigned_LEB_128, get_length_as_unsigned_LEB_128): Move function definitions to int_encoding.cc (insert_into_vector, read_from_pointer): Move template definitions to int_encoding.h * attributes.cc: New file. * attributes.h: New file. * int_encoding.cc: New file. * int_encoding.h: New file.
Diffstat (limited to 'gold/attributes.cc')
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diff --git a/gold/attributes.cc b/gold/attributes.cc
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+// attributes.cc -- object attributes for gold
+
+// Copyright 2009 Free Software Foundation, Inc.
+// Written by Doug Kwan <dougkwan@google.com>.
+// This file contains code adapted from BFD.
+
+// This file is part of gold.
+
+// This program is free software; you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation; either version 3 of the License, or
+// (at your option) any later version.
+
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
+// MA 02110-1301, USA.
+
+#include "gold.h"
+
+#include <limits>
+
+#include "attributes.h"
+#include "elfcpp.h"
+#include "target.h"
+#include "parameters.h"
+#include "int_encoding.h"
+
+namespace gold
+{
+
+// Object_attribute methods.
+
+// Return size of attribute encode in ULEB128.
+
+size_t
+Object_attribute::size(int tag) const
+{
+ // Attributes with default values are not written out.
+ if (this->is_default_attribute())
+ return 0;
+
+ size_t size = get_length_as_unsigned_LEB_128(tag);
+ if (Object_attribute::attribute_type_has_int_value(this->type_))
+ size += get_length_as_unsigned_LEB_128(this->int_value_);
+ if (Object_attribute::attribute_type_has_string_value(this->type_))
+ size += this->string_value_.size() + 1;
+ return size;
+}
+
+// Whether this has the default value (0/"").
+
+bool
+Object_attribute::is_default_attribute() const
+{
+ if (Object_attribute::attribute_type_has_int_value(this->type_)
+ && this->int_value_ != 0)
+ return false;
+ if (Object_attribute::attribute_type_has_string_value(this->type_)
+ && !this->string_value_.empty())
+ return false;
+ if (Object_attribute::attribute_type_has_no_default(this->type_))
+ return false;
+
+ return true;
+}
+
+// Whether this matches another Object_attribute OA in merging.
+// Two Object_attributes match if they have the same values.
+
+bool
+Object_attribute::matches(const Object_attribute& oa) const
+{
+ return ((this->int_value_ != oa.int_value_)
+ && (this->string_value_ == oa.string_value_));
+}
+
+// Write this with TAG to a BUFFER.
+
+void
+Object_attribute::write(
+ int tag,
+ std::vector<unsigned char>* buffer) const
+{
+ // No need to write default attributes.
+ if (this->is_default_attribute())
+ return;
+
+ // Write tag.
+ write_unsigned_LEB_128(buffer, convert_types<uint64_t, int>(tag));
+
+ // Write integer value.
+ if (Object_attribute::attribute_type_has_int_value(this->type_))
+ write_unsigned_LEB_128(buffer,
+ convert_types<uint64_t, int>(this->int_value_));
+
+ // Write string value.
+ if (Object_attribute::attribute_type_has_string_value(this->type_))
+ {
+ const unsigned char* start =
+ reinterpret_cast<const unsigned char*>(this->string_value_.c_str());
+ const unsigned char* end = start + this->string_value_.size() + 1;
+ buffer->insert(buffer->end(), start, end);
+ }
+}
+
+// Vendor_object_attributes methods.
+
+// Copying constructor.
+
+Vendor_object_attributes::Vendor_object_attributes(
+ const Vendor_object_attributes& voa)
+{
+ this->vendor_ = voa.vendor_;
+
+ for (int i = 0; i < NUM_KNOWN_ATTRIBUTES; ++i)
+ this->known_attributes_[i] = voa.known_attributes_[i];
+
+ // We do not handle attribute deletion. So this must be empty.
+ gold_assert(this->other_attributes_.empty());
+
+ for (Other_attributes::const_iterator p = voa.other_attributes_.begin();
+ p != voa.other_attributes_.end();
+ ++p)
+ this->other_attributes_[p->first] = new Object_attribute(*(p->second));
+}
+
+// Size of this in number of bytes.
+
+size_t
+Vendor_object_attributes::size() const
+{
+ if (this->name() == NULL)
+ return 0;
+
+ size_t data_size = 0;
+ for (int i = 4; i < NUM_KNOWN_ATTRIBUTES; ++i)
+ data_size += this->known_attributes_[i].size(i);
+
+ for (Other_attributes::const_iterator p = this->other_attributes_.begin();
+ p != this->other_attributes_.end();
+ ++p)
+ data_size += p->second->size(p->first);
+
+ // <size> <vendor_name> NUL 0x1 <size>
+ return ((data_size != 0
+ || this->vendor_ == Object_attribute::OBJ_ATTR_PROC)
+ ? data_size + strlen(this->name()) + 2 + 2 * 4
+ : 0);
+}
+
+// Return a new attribute associated with TAG.
+
+Object_attribute*
+Vendor_object_attributes::new_attribute(int tag)
+{
+ int type = Object_attribute::arg_type(this->vendor_, tag);
+
+ if (tag < NUM_KNOWN_ATTRIBUTES)
+ {
+ this->known_attributes_[tag].set_type(type);
+ return &this->known_attributes_[tag];
+ }
+ else
+ {
+ Object_attribute* attr = new Object_attribute();
+
+ // This should be the first time we insert this.
+ std::pair<Other_attributes::iterator, bool> ins =
+ this->other_attributes_.insert(std::make_pair(tag, attr));
+ gold_assert(ins.second);
+
+ attr->set_type(type);
+ return attr;
+ }
+}
+
+// Return an attribute associated with TAG.
+
+Object_attribute*
+Vendor_object_attributes::get_attribute(int tag)
+{
+ if (tag < NUM_KNOWN_ATTRIBUTES)
+ return &this->known_attributes_[tag];
+ else
+ {
+ Other_attributes::iterator p =
+ this->other_attributes_.find(tag);
+ return p != this->other_attributes_.end() ? p->second : NULL;
+ }
+}
+
+const Object_attribute*
+Vendor_object_attributes::get_attribute(int tag) const
+{
+ if (tag < NUM_KNOWN_ATTRIBUTES)
+ return &this->known_attributes_[tag];
+ else
+ {
+ Other_attributes::const_iterator p =
+ this->other_attributes_.find(tag);
+ return p != this->other_attributes_.end() ? p->second : NULL;
+ }
+}
+
+// Write attributes to BUFFER.
+
+void
+Vendor_object_attributes::write(std::vector<unsigned char>* buffer) const
+{
+ // Write subsection size.
+ size_t voa_size = this->size();
+ uint32_t voa_size_as_u32 = convert_types<uint32_t, size_t>(voa_size);
+ insert_into_vector<32>(buffer, voa_size_as_u32);
+
+ // Write vendor name.
+ const unsigned char* vendor_start =
+ reinterpret_cast<const unsigned char*>(this->name());
+ size_t vendor_length = strlen(this->name()) + 1;
+ const unsigned char* vendor_end = vendor_start + vendor_length;
+ buffer->insert(buffer->end(), vendor_start, vendor_end);
+
+ // Write file tag.
+ buffer->push_back(Object_attribute::Tag_File);
+
+ // Write attributes size.
+ uint32_t attributes_size_as_u32 =
+ convert_types<uint32_t, size_t>(voa_size - 4 - vendor_length);
+ insert_into_vector<32>(buffer, attributes_size_as_u32);
+
+ // Write known attributes, skipping any defaults.
+ for (int i = 4; i < NUM_KNOWN_ATTRIBUTES; ++i)
+ {
+ // A target may write known attributes in a special order.
+ // Call target hook to remap tags. Attributes_order is the identity
+ // function if no re-ordering is required.
+ int tag = parameters->target().attributes_order(i);
+ this->known_attributes_[tag].write(tag, buffer);
+ }
+
+ // Write other attributes.
+ for (Other_attributes::const_iterator q = this->other_attributes_.begin();
+ q != this->other_attributes_.end();
+ ++q)
+ q->second->write(q->first, buffer);
+}
+
+// Attributes_section_data methods.
+
+// Compute encoded size of this.
+
+size_t
+Attributes_section_data::size() const
+{
+ size_t data_size = 0;
+ for(int vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; ++vendor)
+ data_size += this->vendor_object_attributes_[vendor]->size();
+
+ // 'A' <sections for each vendor>
+ return data_size != 0 ? data_size + 1 : 0;
+}
+
+// Construct an Attributes_section_data object by parsing section contents
+// specified by VIEW and SIZE.
+
+Attributes_section_data::Attributes_section_data(
+ const unsigned char* view,
+ section_size_type size)
+{
+ for (int vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; ++vendor)
+ this->vendor_object_attributes_[vendor] =
+ new Vendor_object_attributes(vendor);
+
+ const unsigned char *p = view;
+ p = view;
+ if (*(p++) == 'A')
+ {
+ size--;
+ while (size > 0)
+ {
+ // Size of vendor attributes section.
+ section_size_type section_size =
+ convert_to_section_size_type(read_from_pointer<32>(&p));
+
+ if (section_size > size)
+ section_size = size;
+ size -= section_size;
+
+ const char* section_name = reinterpret_cast<const char*>(p);
+ section_size_type section_name_size = strlen(section_name) + 1;
+ section_size -= section_name_size + 4;
+
+ int vendor;
+ const char *std_section = parameters->target().attributes_vendor();
+ if (std_section != NULL && strcmp(section_name, std_section) == 0)
+ vendor = Object_attribute::OBJ_ATTR_PROC;
+ else if (strcmp(section_name, "gnu") == 0)
+ vendor = Object_attribute::OBJ_ATTR_GNU;
+ else
+ {
+ // Other vendor section. Ignore it.
+ p += section_name_size + section_size;
+ continue;
+ }
+ p += section_name_size;
+
+ while (section_size > 0)
+ {
+ const unsigned char* subsection_start = p;
+
+ // Read vendor subsection index and size.
+ size_t uleb128_len;
+ uint64_t val = read_unsigned_LEB_128(p, &uleb128_len);
+ p += uleb128_len;
+
+ int tag = convert_types<int, uint64_t>(val);
+ section_size_type subsection_size =
+ convert_to_section_size_type(read_from_pointer<32>(&p));
+ section_size -= subsection_size;
+ subsection_size -= (p - subsection_start);
+
+ const unsigned char* end = p + subsection_size;
+ switch (tag)
+ {
+ case Object_attribute::Tag_File:
+ while (p < end)
+ {
+ val = read_unsigned_LEB_128(p, &uleb128_len);
+ p += uleb128_len;
+ tag = convert_types<int, uint64_t>(val);
+ Vendor_object_attributes* pvoa =
+ this->vendor_object_attributes_[vendor];
+ Object_attribute* attr = pvoa->new_attribute(tag);
+ const char* string_arg;
+ unsigned int int_arg;
+
+ int type = Object_attribute::arg_type(vendor, tag);
+ switch (type
+ & (Object_attribute::ATTR_TYPE_FLAG_INT_VAL
+ | Object_attribute::ATTR_TYPE_FLAG_STR_VAL))
+ {
+ case (Object_attribute::ATTR_TYPE_FLAG_INT_VAL
+ | Object_attribute::ATTR_TYPE_FLAG_STR_VAL):
+ val = read_unsigned_LEB_128(p, &uleb128_len);
+ p += uleb128_len;
+ int_arg = convert_types<unsigned int, uint64_t>(val);
+ string_arg = reinterpret_cast<const char *>(p);
+ attr->set_int_value(int_arg);
+ p += strlen(string_arg) + 1;
+ break;
+ case Object_attribute::ATTR_TYPE_FLAG_STR_VAL:
+ string_arg = reinterpret_cast<const char *>(p);
+ attr->set_string_value(string_arg);
+ p += strlen(string_arg) + 1;
+ break;
+ case Object_attribute::ATTR_TYPE_FLAG_INT_VAL:
+ val = read_unsigned_LEB_128(p, &uleb128_len);
+ p += uleb128_len;
+ int_arg = convert_types<unsigned int, uint64_t>(val);
+ attr->set_int_value(int_arg);
+ break;
+ default:
+ gold_unreachable();
+ }
+ }
+ break;
+ case Object_attribute::Tag_Section:
+ case Object_attribute::Tag_Symbol:
+ // Don't have anywhere convenient to attach these.
+ // Fall through for now.
+ default:
+ // Ignore things we don't know about.
+ p += subsection_size;
+ subsection_size = 0;
+ break;
+ }
+ }
+ }
+ }
+}
+
+// Merge target-independent attributes from another Attribute_section_data
+// ASD from an object called NAME into this.
+
+void
+Attributes_section_data::merge(
+ const char* name,
+ const Attributes_section_data* pasd)
+{
+ // The only common attribute is currently Tag_compatibility,
+ // accepted in both processor and "gnu" sections.
+ for (int vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; ++vendor)
+ {
+ // Handle Tag_compatibility. The tags are only compatible if the flags
+ // are identical and, if the flags are '1', the strings are identical.
+ // If the flags are non-zero, then we can only use the string "gnu".
+ const Object_attribute* in_attr =
+ &pasd->known_attributes(vendor)[Object_attribute::Tag_compatibility];
+ Object_attribute* out_attr =
+ &this->known_attributes(vendor)[Object_attribute::Tag_compatibility];
+
+ if (in_attr->int_value() > 0
+ && in_attr->string_value() != "gnu")
+ {
+ gold_error(_("%s: must be processed by '%s' toolchain"),
+ name, in_attr->string_value().c_str());
+ return;
+ }
+
+ if (in_attr->int_value() != out_attr->int_value()
+ || in_attr->string_value() != out_attr->string_value())
+ {
+ gold_error(_("%s: object tag '%d, %s' is "
+ "incompatible with tag '%d, %s'"),
+ name, in_attr->int_value(),
+ in_attr->string_value().c_str(),
+ out_attr->int_value(),
+ out_attr->string_value().c_str());
+ }
+ }
+}
+
+// Write to a buffer.
+
+void
+Attributes_section_data::write(std::vector<unsigned char>* buffer) const
+{
+ buffer->push_back('A');
+ for (int vendor = OBJ_ATTR_FIRST; vendor <= OBJ_ATTR_LAST; ++vendor)
+ if (this->vendor_object_attributes_[vendor]->size() != 0)
+ this->vendor_object_attributes_[vendor]->write(buffer);
+}
+
+// Methods for Output_attributes_section_data.
+
+// Write attributes section data to file OF.
+
+void
+Output_attributes_section_data::do_write(Output_file* of)
+{
+ off_t offset = this->offset();
+ const section_size_type oview_size =
+ convert_to_section_size_type(this->data_size());
+ unsigned char* const oview = of->get_output_view(offset, oview_size);
+
+ std::vector<unsigned char> buffer;
+ this->attributes_section_data_.write(&buffer);
+ gold_assert(convert_to_section_size_type(buffer.size()) == oview_size);
+ memcpy(oview, buffer.data(), buffer.size());
+ of->write_output_view(this->offset(), oview_size, oview);
+}
+
+} // End namespace gold.