Commit Graph

4 Commits

Author SHA1 Message Date
Rafael Auler 347fb02093 [lld] Teach LLD how to parse most linker scripts
This patch does *not* implement any semantic actions, but it is a first step to
teach LLD how to read complete linker scripts. The additional linker scripts
statements whose parsing is now supported are:

* SEARCH_DIR directive
* SECTIONS directive
* Symbol definitions inside SECTIONS including PROVIDE and PROVIDE_HIDDEN
* C-like expressions used in many places in linker scripts
* Input to output sections mapping

The goal of this commit was guided towards completely parsing a default GNU ld
linker script and the linker script used to link the FreeBSD kernel. Thus, it
also adds a test case based on the default linker script used in GNU ld for
x86_64 ELF targets. I tested SPEC userland programs linked by GNU ld, using the
linker script dump'ed by this parser, and everything went fine. I then tested
linking the FreeBSD kernel with a dump'ed linker script, installed the new
kernel and booted it, everything went fine.

Directives that still need to be implemented:
* MEMORY
* PHDRS

Reviewers: silvas, shankarke and ruiu

http://reviews.llvm.org/D5852

llvm-svn: 221126
2014-11-03 04:09:51 +00:00
Simon Atanasyan 64c0ac2b35 [ELF] Implement parsing `-l` prefixed items in the `GROUP` linker script command.
There are two forms of `-l` prefixed expression:

* -l<libname>
* -l:<filename>

In the first case a linker should construct a full library name
`lib + libname + .[so|a]` and search this library as usual. In the second case
a linker should use the `<filename>` as is and search this file through library
search directories.

The patch reviewed by Shankar Easwaran.

llvm-svn: 213077
2014-07-15 17:17:30 +00:00
Shankar Easwaran a328344367 [LinkerScript] parse OUTPUT_FORMAT : treat quotedStrings as identifier
llvm-svn: 202166
2014-02-25 17:02:54 +00:00
Shankar Easwaran 2ea5148eff [LinkerScript] OUTPUT_FORMAT: Parse Quoted Strings
llvm-svn: 202111
2014-02-25 05:17:24 +00:00