Update test coverage documentation (#4077)

guide/src/wasm-bindgen-test/coverage.md

@@ -68,21 +68,24 @@ crate_name=name_of_the_tested_crate_in_snake_case
 objects=()
 IFS=$'\n'
 for file in $(
- CARGO_HOST_RUSTFLAGS=--cfg=wasm_bindgen_unstable_test_coverage \
- RUSTFLAGS="-Cinstrument-coverage -Zno-profiler-runtime --emit=llvm-ir --cfg=wasm_bindgen_unstable_test_coverage" \
- cargo +nightly test -Ztarget-applies-to-host -Zhost-config --tests --no-run --message-format=json | \
- jq -r "select(.reason == \"compiler-artifact\") | (select(.target.kind == [\"test\"]) // select(.target.name == \"$crate_name\")) | .filenames[0]"
+  CARGO_HOST_RUSTFLAGS=--cfg=wasm_bindgen_unstable_test_coverage \
+  RUSTFLAGS="-Cinstrument-coverage -Zno-profiler-runtime --emit=llvm-ir --cfg=wasm_bindgen_unstable_test_coverage" \
+  cargo +nightly test -Ztarget-applies-to-host -Zhost-config --tests --no-run --message-format=json | \
+  jq -r "select(.reason == \"compiler-artifact\") | (select(.target.kind == [\"test\"]) // select(.target.name == \"$crate_name\")) | .filenames[0]"
 )
 do
- if [[ ${file##*.} == "rlib" ]]; then
- base=$(basename $file .rlib)
- file=$(dirname $file)/${base#"lib"}.ll
- else
- file=$(dirname $file)/$(basename $file .wasm).ll
- fi
-
- perl -i -p0e 's/(^define.*?$).*?^}/$1\nstart:\n unreachable\n}/gms' $file
- perl -i -p0e 's/(^define( [^ ]+)*) range\(.*?\)/$1/gm' $file
+ if [[ ${file##*.} == "rlib" ]]; then
+ base=$(basename $file .rlib)
+ file=$(dirname $file)/${base#"lib"}.ll
+ else
+ file=$(dirname $file)/$(basename $file .wasm).ll
+ fi
+
+ perl -i -p0e 's/(^define.*?$).*?^}/$1\nstart:\n unreachable\n}/gms' $file
+ counter=1
+ while (( counter != 0 )); do
+ counter=$(perl -i -p0e '$c+= s/(^(define|declare)(,? [^\n ]+)*),? range\(.*?\)/$1/gm; END{print "$c"}' $file)
+ done
 
  output = $(basename $file .ll).o
  clang-18 $input -Wno-override-module -c -o $output