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feat(testing): line coverage via --coverage + bin/x test --coverage (#45)
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Instrument each emitted statement with a per-source-line hit counter, gated
behind a new --coverage flag (default off) so ordinary builds — and the
compiler's own self-compile — stay byte-identical and the C-free bootstrap
fixpoint is untouched. A static line table plus a parallel hit-counter array
are dumped at exit through an atexit hook to $LUDIC_COVERAGE (default
ludic.cov) as a `FILE <name>` header and `<line> <hits>` rows.

bin/x test --coverage compiles the test specs with instrumentation, runs them
into per-file dumps, and aggregates a clean per-file line-coverage report that
names the unreached lines. Adds examples/library/coverage.ludic (a spec whose
tests deliberately miss one branch) and docs. Closes the last open acceptance
item of the testing framework (#12).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
This commit is contained in:
Orkun ÇAKILKAYA 2026-08-31 14:51:14 +03:00
parent c7c8e2779c
commit 498593311f
11 changed files with 15317 additions and 14622 deletions
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6
tools/x/main.ludic
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@ -37,6 +37,7 @@ program X {
print("")
print("test:")
print(" x test the full regression suite")
print(" x test --coverage per-file line coverage over the test specs")
print(" x selfhost-test the self-hosting suite (correctness + bootstrap fixpoints)")
print(" x test-tools the editor-toolchain suite")
print(" x golden regenerate selfhost/golden/renders.sha256 (review with git diff)")
@ -79,7 +80,10 @@ program X {
if (cmd == "app") { exit(cmd_app()) }
if (cmd == "tools") { exit(cmd_tools()) }
if (cmd == "clean") { exit(cmd_clean()) }
if (cmd == "test") { exit(cmd_test()) }
if (cmd == "test") {
if (argn(2, "") == "--coverage") { exit(cmd_test_coverage()) }
exit(cmd_test())
}
if (cmd == "selfhost-test") { exit(cmd_selfhost_test()) }
if (cmd == "test-tools") { exit(cmd_test_tools()) }
if (cmd == "check-docs") { exit(cmd_check_docs()) }