Summary:
Fix several issues to make C++ exceptions work in shared objects:
* Set MCObjectFileInfo PIC type based on the input binary type.
* Support indirect (DW_EH_PE_indirect) encoding while writing
exception Type Table.
* Use different LPStart value and landing pad encoding for .so's.
* Disable splitting of exception-handling code for .so's because of
the new encoding.
(cherry picked from FBD24698765)
Summary:
Consolidate code and data emission code in ELF-independent
BinaryEmitter. The high-level interface includes only two
functions emitBinaryContext() and emitFunctionBody() used
by RewriteInstance and BinaryContext respectively.
(cherry picked from FBD20332901)
Summary:
If a function size indicated in FDE is different from the one in the
symbol table, we can keep processing the function as we are using the
max size for internal purposes. Typically this happens for
assembly-written functions with padding at the end. This padding is not
included in FDE, but it is in the symbol table.
(cherry picked from FBD14987653)
Summary:
This refactoring makes it easier to create new code sections and control
code placement. As an example, cold code is being placed into
".text.cold" which is emitted independently from ".text", and the final
address assignment becomes more flexible.
Previously, in non-relocation mode we used to emit temporary section
name into .shstrtab. This resulted in unnecessary bloat of this section.
There was unnecessary padding emitted at the end of text section. After
fixing this, the output binary becomes smaller.
I had to change the way exception handling tables are re-written
as the current infra does not support cross-section label difference.
This means we have to emit absolute landing pad addresses, which might
not work for PIE binaries. I'm going to address this once I investigate
the current exception handling issues in PIEs.
This diff temporarily disables "-hot-functions-at-end" option.
(cherry picked from FBD14475693)
Summary:
Add heatmap subcommand to produce heatmaps based on perf.data with LBR.
The output is produced in colored ASCII format.
llvm-bolt heatmap -p perf.data <executable>
-block-size=<uint> - size of a heat map block in bytes (default 64)
-line-size=<uint> - number of entries per line (default 256)
-max-address=<uint> - maximum address considered valid for heatmap
(default 4GB)
-o=<string> - heatmap output file (default stdout)
(cherry picked from FBD13969992)
Summary:
lld may generate relocations without associated symbols. Instead of
rejecting binaries with such relocations, we can re-create the symbol
the relocation is against based on the extracted value.
(cherry picked from FBD10054576)
Summary:
BOLT sources are being moved under tools/llvm-bolt/src
and tools/llvm-bolt will contain more files such as LICENSE.txt,
README.txt, etc.
Remove trailing white spaces from our sources.
Create llvm.patch by running
> git diff f137ed238db11440f03083b1c88b7ffc0f4af65e include lib > \
tools/llvm-bolt/llvm.patch
README.txt has instructions on checking out sources and applying the
patch.
(cherry picked from FBD7878380)
