fix(bb): link env_objects into wasm exec; prefetch CRS for wasm-perf-gate

Author: zac-williamson

.github/workflows/wasm-emscripten.yml

@@ -235,14 +235,29 @@ jobs:
         run: |
           cmake --preset wasm-threads
           cmake --build --preset wasm-threads --target ultra_honk_bench
+      - name: Stage CRS for the wasm benchmark
+        run: |
+          # The bench calls init_file_crs_factory, which throws if the CRS
+          # files are absent. http_download is unsupported under WASM
+          # (throws "HTTP download not supported in WASM"), so the runtime
+          # cannot self-fetch -- prefetch on the host before running.
+          # 4 MiB of compressed g1 covers up to 2^17 points, well above the
+          # 2^16 filter below.
+          set -eu
+          mkdir -p "$HOME/.bb-crs"
+          curl -fsSL --range 0-4194303 \
+            https://crs.aztec-cdn.foundation/g1_compressed.dat \
+            -o "$HOME/.bb-crs/bn254_g1_compressed.dat"
+          curl -fsSL https://crs.aztec-cdn.foundation/g2.dat \
+            -o "$HOME/.bb-crs/bn254_g2.dat"
       - name: Run benchmark
         id: bench
         working-directory: barretenberg/cpp
         run: |
           # --benchmark_out writes a clean JSON to a file; google-benchmark
           # otherwise prints to stdout intermixed with BB_BENCH profiling
           # tree, which breaks `json.load`.
-          ./scripts/wasm-run --dir=. \
+          ./scripts/wasm-run --dir="$HOME/.bb-crs" --dir=. \
             ./build-wasm-threads/bin/ultra_honk_bench \
             --benchmark_format=json \
             --benchmark_out=/tmp/bench.json \

barretenberg/cpp/src/CMakeLists.txt

@@ -244,6 +244,12 @@ if(WASM)
     add_executable(
         barretenberg
         ${BARRETENBERG_TARGET_OBJECTS}
+        # env provides logstr / throw_or_abort_impl. Outside WASM these are
+        # supplied by the consumer linking libbarretenberg + env; the WASM
+        # exec is the artifact we ship, so it must bundle them. Without
+        # this, -sEXPORT_ALL=1 hard-errors at link time on the unresolved
+        # WASM_IMPORT-decorated declarations.
+        $<TARGET_OBJECTS:env_objects>
         # This is an object library, so doesn't need _objects.
         $<TARGET_OBJECTS:vm2_stub>
     )