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Author SHA1 Message Date
Yonghong Song 4369223ea7 BPF: make __builtin_btf_type_id() return 64bit int 
Linux kernel recently added support for kernel modules
  https://lore.kernel.org/bpf/20201110011932.3201430-5-andrii@kernel.org/

In such cases, a type id in the kernel needs to be presented
as (btf id for modules, btf type id for this module).
Change __builtin_btf_type_id() to return 64bit value
so libbpf can do the above encoding.

Differential Revision: https://reviews.llvm.org/D91489
 2020-11-16 07:08:41 -08:00
Arthur Eubanks b6ccff3d5f [NewPM] Provide method to run all pipeline callbacks, used for -O0 
Some targets may add required passes via
TargetMachine::registerPassBuilderCallbacks(). We need to run those even
under -O0. As an example, BPFTargetMachine adds
BPFAbstractMemberAccessPass, a required pass.

This also allows us to clean up BackendUtil.cpp (and out-of-tree Rust
usage of the NPM) by allowing us to share added passes like coroutines
and sanitizers between -O0 and other optimization levels.

Since callbacks may end up not adding passes, we need to check if the
pass managers are empty before adding them, so PassManager now has an
isEmpty() function. For example, polly adds callbacks but doesn't always
add passes in those callbacks, so this is necessary to keep
-debug-pass-manager tests' output from changing depending on if polly is
enabled or not.

Tests are a continuation of those added in
https://reviews.llvm.org/D89083.

Reviewed By: asbirlea, Meinersbur

Differential Revision: https://reviews.llvm.org/D89158
 2020-11-11 15:10:27 -08:00
Arthur Eubanks 226e179f74 Revert "[NewPM] Provide method to run all pipeline callbacks, used for -O0" 
This reverts commit ae38540042.
As well as some follow-up test fixes.

The original change causes new-pass-manager.ll to fail when polly is enabled.
 2020-11-08 00:32:35 -08:00
Arthur Eubanks ae38540042 [NewPM] Provide method to run all pipeline callbacks, used for -O0 
Some targets may add required passes via
    TargetMachine::registerPassBuilderCallbacks(). We need to run those even
    under -O0. As an example, BPFTargetMachine adds
    BPFAbstractMemberAccessPass, a required pass.

    This also allows us to clean up BackendUtil.cpp (and out-of-tree Rust
    usage of the NPM) by allowing us to share added passes like coroutines
    and sanitizers between -O0 and other optimization levels.

    Tests are a continuation of those added in
    https://reviews.llvm.org/D89083.

    In order to prevent TargetMachines from adding unnecessary optimization
    passes at -O0, TargetMachine::registerPassBuilderCallbacks() will be
    changed to take an OptimizationLevel, but that will be done separately.

Reviewed By: asbirlea

Differential Revision: https://reviews.llvm.org/D89158
 2020-11-04 22:27:16 -08:00
Arthur Eubanks 2218e6d0a8 [BPF] Make BPFAbstractMemberAccessPass required 
Or else on optnone functions we get the following during instruction selection:
  fatal error: error in backend: Cannot select: intrinsic %llvm.preserve.struct.access.index

Currently the -O0 pipeline doesn't properly run passes registered via
TargetMachine::registerPassBuilderCallbacks(), so don't add that RUN
line yet. That will be fixed after this.

Reviewed By: yonghong-song

Differential Revision: https://reviews.llvm.org/D89083
 2020-10-09 11:26:37 -07:00