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7f8cd84403
* expression.cc (script_exp_function_origin)
(script_exp_function_length): Move from here to ...
* script.cc: ... here.
(script_set_section_region, script_add_memory)
(script_parse_memory_attr, script_include_directive): New
functions.
* script-sections.cc
(class Memory_region): New class.
(class Output_section_definition): Add set_memory_region,
set_section_vma, set_section_lma and get_section_name methods.
(class Script_Sections): Add add_memory_region,
find_memory_region, find_memory_region_origin,
find_memory_region_length and set_memory_region methods.
Have set_section_addresses method walk the list of set memory
regions.
Extend the print methos to display memory regions.
* script-sections.h: Add prototypes for new methods.
Add enum for MEMORY region attributes.
* yyscript.y: Add support for parsing MEMORY regions.
* script-c.h: Add prototypes for new functions.
* testsuite/Makefile.am: Add test of MEMORY region functionality.
* testsuite/Makefile.in: Regenerate.
* testsuite/memory_test.sh: New script.
* testsuite/memory_test.s: New assembler source file.
* testsuite/memory_test.t: New linker script.
63 lines
2.6 KiB
Plaintext
63 lines
2.6 KiB
Plaintext
gold is an ELF linker. It is intended to have complete support for
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ELF and to run as fast as possible on modern systems. For normal use
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it is a drop-in replacement for the older GNU linker.
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gold is part of the GNU binutils. See ../binutils/README for more
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general notes, including where to send bug reports.
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gold was originally developed at Google, and was contributed to the
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Free Software Foundation in March 2008. At Google it was designed by
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Ian Lance Taylor, with major contributions by Cary Coutant, Craig
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Silverstein, and Andrew Chatham.
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The existing GNU linker manual is intended to be accurate
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documentation for features which gold supports. gold supports most of
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the features of the GNU linker for ELF targets. Notable
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omissions--features of the GNU linker not currently supported in
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gold--are:
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* MRI compatible linker scripts
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* cross-reference reports (--cref)
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* various other minor options
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Notes on the code
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=================
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These are some notes which may be helpful to people working on the
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source code of gold itself.
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gold is written in C++. It is a GNU program, and therefore follows
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the GNU formatting standards as modified for C++. Source documents in
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order of decreasing precedence:
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http://www.gnu.org/prep/standards/
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http://gcc.gnu.org/onlinedocs/libstdc++/17_intro/C++STYLE
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http://www.zembu.com/eng/procs/c++style.html
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The linker is intended to have complete support for cross-compilation,
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while still supporting the normal case of native linking as fast as
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possible. In order to do this, many classes are actually templates
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whose parameter is the ELF file class (e.g., 32 bits or 64 bits). The
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C++ code is the same, but we don't pay the execution time cost of
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always using 64-bit integers if the target is 32 bits. Many of these
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class templates also have an endianness parameter: true for
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big-endian, false for little-endian.
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The linker is multi-threaded. The Task class represents a single unit
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of work. Task objects are stored on a single Workqueue object. Tasks
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communicate via Task_token objects. Task_token objects are only
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manipulated while holding the master Workqueue lock. Relatively few
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mutexes are used.
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Build requirements
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==================
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The gold source code uses templates heavily. Building it requires a
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recent version of g++. g++ 4.0.3 is known to work. g++ 3.2 and g++
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3.4.3 are known to fail.
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The linker script parser uses features which are only in newer
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versions of bison. bison 2.3 is known to work. bison 1.26 is known
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to fail. If you are building gold from an official binutils release,
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the bison output should already be included.
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