Resolve wasm traps to unit source

scripts/compile_wasm_unit

@@ -15,7 +15,9 @@ ABI_VERSION=${UCE_UNIT_ABI_VERSION:-6}
 ROOT=$(pwd)
 OBJ_FN="$DEST_DIR/$PP_FN.wasm.o"
 ABI_TMP="$DEST_DIR/$PP_FN.uce-abi.txt"
+MODULE_TMP="$DEST_DIR/$PP_FN.uce-module.txt"
 WASM_TMP="$DEST_DIR/$WASM_FN.tmp.$$"
+MAP_TMP="$DEST_DIR/$WASM_FN.source-map.tmp.$$"
 PCH_ENABLED=${UCE_WASM_UNIT_PCH:-1}
 PCH_DIR=${UCE_WASM_PCH_DIR:-/tmp/uce/wasm-w2/pch}
 COMMON_FLAGS=(
@@ -33,7 +35,7 @@ COMMON_FLAGS=(
 	-DPLATFORM_NAME=\"wasm32-wasip1\"
 )
 
-if [ ! -x "$SDK/bin/clang++" ] || [ ! -x "$SDK/bin/wasm-ld" ] || [ ! -x "$SDK/bin/llvm-objcopy" ]; then
+if [ ! -x "$SDK/bin/clang++" ] || [ ! -x "$SDK/bin/wasm-ld" ] || [ ! -x "$SDK/bin/llvm-objcopy" ] || [ ! -x "$SDK/bin/llvm-dwarfdump" ]; then
 	echo "wasi-sdk tools not found; set WASI_SDK" >&2
 	exit 1
 fi
@@ -45,7 +47,7 @@ PCH_KEY=$(printf '%s\n%s\n%s\n%s\n' "$ABI_VERSION" "$TOOLCHAIN_ID" "$HEADER_HASH
 PCH_FN="$PCH_DIR/uce_lib-wasm-unit-$PCH_KEY.pch"
 
 mkdir -p "$DEST_DIR" >/dev/null 2>&1
-trap 'rm -f "$OBJ_FN" "$ABI_TMP" "$WASM_TMP"' EXIT
+trap 'rm -f "$OBJ_FN" "$ABI_TMP" "$MODULE_TMP" "$WASM_TMP" "$MAP_TMP"' EXIT
 
 build_pch_if_needed() {
 	if [ "$PCH_ENABLED" = "0" ]; then
@@ -67,6 +69,7 @@ unit_abi_version=$ABI_VERSION
 toolchain=$TOOLCHAIN_ID
 source=$SRC_FN
 EOF
+printf '%s' "$(basename "$WASM_TMP")" > "$MODULE_TMP"
 
 build_pch_if_needed
 PCH_FLAGS=()
@@ -93,9 +96,19 @@ fi
 	--export-if-defined=__uce_once \
 	--export-if-defined=__uce_init
 
-"$SDK/bin/llvm-objcopy" --strip-debug --add-section=uce.abi="$ABI_TMP" "$WASM_TMP"
+python3 scripts/build_unit_source_map.py \
+	--dwarfdump "$SDK/bin/llvm-dwarfdump" \
+	--wasm "$WASM_TMP" \
+	--module "$(basename "$WASM_TMP")" \
+	--output "$MAP_TMP"
+
+"$SDK/bin/llvm-objcopy" --strip-debug \
+	--add-section=uce.abi="$ABI_TMP" \
+	--add-section=uce.module="$MODULE_TMP" \
+	"$WASM_TMP"
 
 python3 scripts/check_unit_wasm.py "$WASM_TMP" --abi-version "$ABI_VERSION" --llvm-nm "$SDK/bin/llvm-nm"
+mv "$MAP_TMP" "$DEST_DIR/$WASM_FN.source-map"
 mv "$WASM_TMP" "$DEST_DIR/$WASM_FN"
 
-rm -f "$OBJ_FN" "$ABI_TMP"
+rm -f "$OBJ_FN" "$ABI_TMP" "$MODULE_TMP"