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#!/bin/bash
# builds the browser compiler: the microcore with the compiler genome inside, as
# WebAssembly, written to build/web/zc.wasm (or the path given as the first
# argument). the page (src/web/index.html) loads it next to zc.js; `make web`
# copies both beside it, so build/web/ is the whole site. needs clang with the
# wasm32 target, #embed and wasm-ld, and the genome from `make genome`.
set -e
case "${1:-}" in
--help|-h) printf '%s\n' 'usage: src/web/build.sh [OUTFILE.wasm]' 'builds the browser compiler vm; defaults to build/web/zc.wasm.' 'requires clang with wasm32 and #embed support, and wasm-ld.' 'environment: WASM_CC selects the compiler; GENOME_DIR holds genome.bin (build/core); MAP_DIR holds its memmap.h (build/core/map).'; exit 0 ;;
-*) echo "web build: unknown option $1; use --help for usage" >&2; exit 2 ;;
esac
cd "$(dirname "$0")/../.."
OUT=${1:-build/web/zc.wasm}
WASM_CC=${WASM_CC:-$(sh src/tools/findcc.sh --wasm)}
GENOME_DIR=${GENOME_DIR:-build/core}; MAP_DIR=${MAP_DIR:-build/core/map}
[ -f "$GENOME_DIR/genome.bin" ] || { echo "web build: no $GENOME_DIR/genome.bin; run make genome first" >&2; exit 1; }
mkdir -p "$(dirname "$OUT")"
"$WASM_CC" --target=wasm32 -O2 -w -fwrapv -nostdlib -fno-builtin -mbulk-memory -DJTYPE=int \
-Isrc/core -I"$MAP_DIR" --embed-dir="$GENOME_DIR" -Isrc/micro src/micro/micro.c src/web/port_wasm.c \
-Wl,--no-entry -Wl,--export=wasm_input -Wl,--export=wasm_input_cap -Wl,--export=wasm_set_input -Wl,--export=wasm_run \
-Wl,--export=memory -Wl,--allow-undefined -Wl,--initial-memory=33554432 -Wl,-z,stack-size=65536 \
-o "$OUT"
ls -l "$OUT"
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