Commit Graph

8 Commits

Author SHA1 Message Date
Frederic Riss 84c09a51e9 [dsymutil] Add DIE selection algorithm.
With this commit, llvm-dsymutil learns how to choose which DIEs
it will link in the final output and which ones it won't. This
is based on the 'valid relocation' information that has been
built in the previous commits.

The test only tests that we choose the right 'root DIEs'. The
selection algorithm (and especially the part that walk the
dependencies of a root DIE) lacks a bit test coverage. This
will be much easier to cover when we output actual Dwarf and
thus can use llvm-dwarfdump to verify the structure of the
emitted DIE trees. I'll add more tests then.

llvm-svn: 229183
2015-02-13 23:18:34 +00:00
Frederic Riss d34551833f [dsymutil] Add DwarfLinker class.
It's an empty shell for now. It's main method just opens the debug
map objects and parses their Dwarf info. Test that we at least do
that correctly.

llvm-svn: 227337
2015-01-28 18:27:01 +00:00
Frederic Riss e4a6fef98f [dsymutil] Add the detected target triple to the debug map.
It will be needed to instantiate the Target object that we will
use to create all the MC objects for the dwarf emission.

llvm-svn: 226525
2015-01-19 23:33:14 +00:00
Frederic Riss 4398850779 [dsymutil] Implement the BinaryHolder object and gain archive support.
This object is meant to own the ObjectFiles and their underlying
MemoryBuffer. It is basically the equivalent of an OwningBinary
except that it efficiently handles Archives. It is optimized for
efficiently providing mappings of members of the same archive when
they are opened successively (which is standard in Darwin debug
maps, objects from the same archive will be contiguous).

Of course, the BinaryHolder will also be used by the DWARF linker
once it is commited, but for now only the debug map parser uses it.

With this change, you can run llvm-dsymutil on your Darwin debug build
of clang and get a complete debug map for it.

Differential Revision: http://reviews.llvm.org/D6690

llvm-svn: 225207
2015-01-05 21:29:28 +00:00
Reid Kleckner 5135227549 Relax debug-map-parsing.test error message check for Windows
On Windows we get the string "no such file or directory".

llvm-svn: 224141
2014-12-12 18:52:07 +00:00
Frederic Riss 231f714e54 Initial dsymutil tool commit.
The goal of this tool is to replicate Darwin's dsymutil functionality
based on LLVM. dsymutil is a DWARF linker. Darwin's linker (ld64) does
not link the debug information, it leaves it in the object files in
relocatable form, but embbeds a `debug map` into the executable that
describes where to find the debug information and how to relocate it.
When releasing/archiving a binary, dsymutil is called to link all the DWARF
information into a `dsym bundle` that can distributed/stored along with
the binary.

With this commit, the LLVM based dsymutil is just able to parse the STABS
debug maps embedded by ld64 in linked binaries (and not all of them, for
example archives aren't supported yet).

Note that the tool directory is called dsymutil, but the executable is
currently called llvm-dsymutil. This discrepancy will disappear once the
tool will be feature complete. At this point the executable will be renamed
to dsymutil, but until then you do not want it to override the system one.

    Differential Revision: http://reviews.llvm.org/D6242

llvm-svn: 224134
2014-12-12 17:31:24 +00:00
Frederic Riss 04aef05537 Revert "Initial dsymutil tool commit."
This reverts commit r223793. The review thread wasn't concluded.

llvm-svn: 223794
2014-12-09 17:21:50 +00:00
Frederic Riss 893c4f1e4d Initial dsymutil tool commit.
The goal of this tool is to replicate Darwin's dsymutil functionality
based on LLVM. dsymutil is a DWARF linker. Darwin's linker (ld64) does
not link the debug information, it leaves it in the object files in
relocatable form, but embbeds a `debug map` into the executable that
describes where to find the debug information and how to relocate it.
When releasing/archiving a binary, dsymutil is called to link all the DWARF
information into a `dsym bundle` that can distributed/stored along with
the binary.

With this commit, the LLVM based dsymutil is just able to parse the STABS
debug maps embedded by ld64 in linked binaries (and not all of them, for
example archives aren't supported yet).

Note that the tool directory is called dsymutil, but the executable is
currently called llvm-dsymutil. This discrepancy will disappear once the
tool will be feature complete. At this point the executable will be renamed
to dsymutil, but until then you do not want it to override the system one.

    Differential Revision: http://reviews.llvm.org/D6242

llvm-svn: 223793
2014-12-09 17:03:30 +00:00