Commit Graph

256 Commits

Author SHA1 Message Date
Vladislav Khmelevsky 172deb7594 [PR] Aarch64: Add ABS32/16 relocations support
Summary:
Add R_AARCH64_ABS32 and R_AARCH64_ABS16 relocations support

Vladislav Khmelevsky,
Advanced Software Technology Lab, Huawei

(cherry picked from FBD31875254)
2021-10-19 16:46:20 +03:00
Alexey Moksyakov 85ffa8e4ba [PR][BOLT][Instrumentation] Optimize eflags load/store
Summary:
This commit uses reviews.llvm.org/D6629 as a reference to optimize
X86::EFLAGS load/store in the instrumentation snippet by using lahf/sahf
instructions instead of pushf/popf.

(cherry picked from FBD31662303)
2021-10-11 16:10:06 +00:00
Rafael Auler 443f1b4ff4 Rebase: [BOLT] AsmDump: dump function assembly and profile info
Summary:
Added new functionality of dumping simple functions into assembly.
This includes:
- function control flow (basic blocks, instructions),
- profile information as `FDATA` directives, to be consumed by link_fdata,
- data labels,
- CFI directives,
- symbols for callee functions,
- jump table symbols.

Envisioned usage:
1. Find a function that triggers BOLT crash (e.g. with `bughunter.sh`).
2. Generate reproducer asm source for that function (using `-funcs`).
3. Attach it to an issue.
4. Reduce and include as a test case.

Current limitations:
1. Emitted assembly won't match input file relocations.
2. No DWARF support.
3. Data is not emitted.

(cherry picked from FBD32746857)
2021-09-27 10:51:25 -07:00
Maksim Panchenko 60b0999723 [BOLT][NFC] Do not pass BinaryContext alongside BinaryFunction
Summary:
BinaryContext is available via BinaryFunction::getBinaryContext(),
hence there's no reason to pass both as arguments to a function.

In a similar fashion, BinaryBasicBlock has an access to BinaryFunction
via getFunction(). Eliminate unneeded arguments.

(cherry picked from FBD31921680)
2021-10-26 00:06:34 -07:00
Rafael Auler 0559dab546 [BOLT] Improve cmake configs for opensource
Summary:
Change cmake config in BOLT to only support Linux. In other
platforms, we print a warning that we won't build BOLT.  Change
configs to determine whether we will build BOLT runtime libs. This
only happens in x86 hosts. If true, we will build the runtime and
enable bolt-runtime tests. New tests that depend on the bolt_rt lib
needs to be marked REQUIRES:bolt-runtime. I updated the relevant
tests.  Fix cmake to do not crash when building llvm with a target
that BOLT does not support.

(cherry picked from FBD31935760)
2021-10-26 12:26:23 -07:00
Rafael Auler a34c753fe7 Rebase: [NFC] Refactor sources to be buildable in shared mode
Summary:
Moves source files into separate components, and make explicit
component dependency on each other, so LLVM build system knows how to
build BOLT in BUILD_SHARED_LIBS=ON.

Please use the -c merge.renamelimit=230 git option when rebasing your
work on top of this change.

To achieve this, we create a new library to hold core IR files (most
classes beginning with Binary in their names), a new library to hold
Utils, some command line options shared across both RewriteInstance
and core IR files, a new library called Rewrite to hold most classes
concerned with running top-level functions coordinating the binary
rewriting process, and a new library called Profile to hold classes
dealing with profile reading and writing.

To remove the dependency from BinaryContext into X86-specific classes,
we do some refactoring on the BinaryContext constructor to receive a
reference to the specific backend directly from RewriteInstance. Then,
the dependency on X86 or AArch64-specific classes is transfered to the
Rewrite library. We can't have the Core library depend on targets
because targets depend on Core (which would create a cycle).

Files implementing the entry point of a tool are transferred to the
tools/ folder. All header files are transferred to the include/
folder. The src/ folder was renamed to lib/.

(cherry picked from FBD32746834)
2021-10-08 11:47:10 -07:00