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zeekay
72bc0467c2
Mirrors the evm/cevm pattern (cevm_cgo.go / cevm_nocgo.go +
backend_cgo.go). Three new files in bridgevm/:
backend.go — Backend enum, layout structs (byte-equal to
ops/bridgevm/cuda/bridgevm_kernels_common.cuh),
ErrGPUNotAvailable, GPUBackend interface,
unsafe.Sizeof asserts in init().
bridgevm_gpu.go cgo — direct dlopen(3) + dlsym(3) for the per-backend
plugin libluxgpu_backend_<bk>.{so,dylib}.
Probes cuda → hip → metal → vulkan → webgpu in
order; first plugin exposing all five
lux_<bk>_bridgevm_* launchers wins.
bridgevm_gpu_nocgo.go — stub returning ErrGPUNotAvailable on every method.
Direct dlopen (NOT pkg-config) so the public chains module builds without
the private gpu-kernels repo present. Search path: \$LUX_GPU_PLUGIN_DIR,
\$LUXCPP_PREFIX/lib/lux-gpu, \$LUXCPP_PREFIX/lib, the dev tree under
~/work/lux-private/gpu-kernels/build/backends/<bk>, CWD, and finally the
system loader's default.
Five launcher signatures dispatched via cgo trampolines (one per shape) —
matches the C ABI in include/lux/gpu/bridgevm.h. Layout structs include
explicit '_pad*' fields to keep Go sizeof() byte-equal to the C++
alignas(16) layout; the init() sizeof asserts catch any drift at process
start with a per-struct panic message.
vm.go / bridge_signing.go / mpc.go are NOT touched — this is a thin
substrate; the round applier opts in later when it's ready to route
through ActiveGPUBackend().
bridgevm_gpu_test.go — four tests under //go:build cgo:
TestActiveBackend — AutoBackend() returns a known tag.
TestStubReturnsErrGPUNotAvailable
— BackendNone path returns the sentinel.
TestLayoutSizesMatchHeader — runtime-equivalent of the C++ static_asserts.
TestSignerApplyZeroFixture — dlopen + dlsym + zero-fixture round trip
through lux_<best>_bridgevm_signer_apply.
Builds verified under both CGO_ENABLED=0 (nocgo path active) and
CGO_ENABLED=1 -tags cgo (cgo path active). All four cgo-tagged tests
pass on the local dev box (Vulkan plugin auto-detected from the
gpu-kernels build tree).