#!/bin/bash
# Phase 0: build core (non-PIC reactor, libc statically linked, all-exported)
# and unit (-fPIC, wasm-ld -shared, dylink.0) with wasi-sdk.
# Runs on k-uce. Artifacts go to /tmp/uce/wasm-phase0.
set -e
cd "$(dirname "$0")"

SDK=/opt/wasi-sdk
OUT=/tmp/uce/wasm-phase0
mkdir -p "$OUT"

# Core module: reactor (no main, exports _initialize), exceptions off per
# WASM-PROPOSAL §11.1 (error codes at unit boundaries).
# --export-all so unit modules can import libc/libc++/core symbols from it;
# --import-table so the host creates the shared funcref table (sized with
# headroom up front — WAMR cannot grow or write tables from the host side);
# __stack_pointer exported because PIC side modules import it (dylink ABI).
"$SDK/bin/clang++" --target=wasm32-wasip1 -mexec-model=reactor \
	-O1 -fno-exceptions \
	core.cpp -o "$OUT/core.wasm" \
	-Wl,--export-all \
	-Wl,--import-table \
	-Wl,--export=__stack_pointer \
	-Wl,--export=__heap_base \
	-Wl,--undefined=_ZTVN10__cxxabiv117__class_type_infoE

# Unit module: PIC object, linked -shared with no libc/libc++ of its own —
# every undefined symbol must become an import (resolved from core by the
# loader). Inline/template code (std::string etc.) instantiates locally,
# which is fine; the allocator must NOT be defined here (§3.2).
# -fvisibility-inlines-hidden: vague-linkage code (templates, lambdas)
# binds locally instead of being interposable — without it, one libc++
# tree-emplace lambda became a self-import the loader cannot satisfy.
"$SDK/bin/clang++" --target=wasm32-wasip1 -fPIC -fvisibility=default \
	-fvisibility-inlines-hidden \
	-O1 -fno-exceptions \
	-c unit.cpp -o "$OUT/unit.o"

# --Bsymbolic: bind weak/vague-linkage symbols the unit defines itself
# (template instantiations, lambdas) locally instead of emitting
# self-imports that the loader would have to lazy-bind.
"$SDK/bin/wasm-ld" -shared --experimental-pic \
	--unresolved-symbols=import-dynamic \
	--Bsymbolic \
	"$OUT/unit.o" -o "$OUT/unit.wasm" \
	--export=uce_unit_render

echo "--- core.wasm ---"
ls -la "$OUT/core.wasm"
echo "--- unit.wasm ---"
ls -la "$OUT/unit.wasm"