105 lines
4.7 KiB
Python
105 lines
4.7 KiB
Python
"""S17: gcov actual runtime coverage vs static analysis comparison
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Run with: python test-data/s17_gcov_comparison.py
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"""
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import sys, os, subprocess
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sys.path.insert(0, os.path.join(os.path.dirname(__file__), '..'))
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P=0;F=0
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def ck(v,m=""): global P,F; (P:=P+1) if v else (F:=F+1, print(f" FAIL {m}"))
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def sec(n): print(f"\n--- {n} ---")
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from _paths import BENCH_ROOT as ROOT
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COPYBOOKS = os.path.join(ROOT, "common", "copybooks")
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from cobol_testgen import extract_structure, generate_data
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from cobol_testgen.read import preprocess, resolve_copybooks, extract_data_division, extract_procedure_division, parse_data_division
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from cobol_testgen.core import build_branch_tree
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from cobol_testgen.design import enum_paths, _filter_stop
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from cobol_testgen.coverage import collect_decision_points, mark_coverage
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# Test with program 32 (has 24 branches detected)
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dp = os.path.join(ROOT, "32-mix-1N-samekeybreak")
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fpath = os.path.join(dp, "main-32-mix-1N-samekeybreak.cbl")
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src = open(fpath, encoding='utf-8').read()
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name = "32-mix-1N-samekeybreak"
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sec(f"1. Static coverage analysis on {name}")
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st = extract_structure(src)
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pp = resolve_copybooks(src, dp, extra_search_paths=[COPYBOOKS])
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pp = preprocess(pp)
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dd = extract_data_division(pp)
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fields = parse_data_division(dd) if dd else []
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fdict = [{"name": f.name, "pic_info": {"type": f.pic_info.type if f.pic_info else "unknown"}} for f in fields]
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proc = extract_procedure_division(pp)
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tree, assigns = build_branch_tree(proc, fdict)
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points, leaves = collect_decision_points(tree, fdict)
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paths = [(_filter_stop(c), a) for c, a in enum_paths(tree, fdict)]
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mark_coverage(points, leaves, paths, fdict)
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static_total = sum(len(dp.branch_names) for dp in points)
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static_covered = sum(len(dp.active_branches) for dp in points)
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static_pct = static_covered / max(static_total, 1) * 100
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print(f" Decision points: {len(points)}")
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print(f" Branches: {static_covered}/{static_total} = {static_pct:.0f}%")
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ck(static_total > 0, f"Static: should find branches")
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ck(static_covered >= static_total * 0.75, f"Static coverage >= 75%")
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sec(f"2. Generate data, write flat files, compile+run with --coverage")
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from cobol_testgen.flatfile import write_all_files
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recs = generate_data(pp, st)
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write_all_files(recs, pp, dp)
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print(f" Generated {len(recs)} records")
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exe = os.path.join(dp, "test-gcov-comparison.exe")
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r = subprocess.run(["cobc", "-x", "-Wall", "--coverage", fpath, "-o", exe,
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"-I", COPYBOOKS, "-I", dp], capture_output=True, timeout=30, cwd=dp)
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ck(r.returncode == 0, f"Compile with --coverage")
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if r.returncode == 0:
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# Remove old gcov data
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for f in os.listdir(dp):
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if f.endswith('.gcda'):
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os.remove(os.path.join(dp, f))
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r2 = subprocess.run([exe], capture_output=True, timeout=15, cwd=dp, shell=True)
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ck(r2.returncode == 0, f"Run compiled program")
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print(f" Run RC={r2.returncode}")
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# Run gcov
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gcov_r = subprocess.run(["gcov", "-b", "--source-prefix", dp, fpath],
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capture_output=True, text=True, timeout=10, cwd=dp)
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# Parse gcov output for the .cbl file
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for line in gcov_r.stdout.split('\n'):
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if '.cbl' in line and ('Lines' in line or 'Branches' in line):
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print(f" gcov: {line.strip()}")
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# Read cbl.gcov for branch stats
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cbl_gcov = os.path.join(dp, os.path.basename(fpath) + ".gcov")
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if os.path.exists(cbl_gcov):
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with open(cbl_gcov, encoding='utf-8', errors='replace') as gf:
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content = gf.read()
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branch_lines = [l for l in content.split('\n') if 'branch' in l.lower()]
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taken = sum(1 for l in branch_lines
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if 'taken' in l.lower() and '%' in l
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and not l.strip().startswith('-:'))
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not_taken = sum(1 for l in branch_lines if 'taken 0%' in l)
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print(f" gcov branches: {len(branch_lines)} total, {taken} taken, {not_taken} not-taken")
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ck(len(branch_lines) > 0, f"gcov should produce branch data")
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sec("3. Comparison")
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print(f" Metric Static (our tool) gcov (runtime)")
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print(f" {'─'*60}")
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print(f" Decision points / branches {static_total:<6} COBOL IF {'N/A (C-level)'}")
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print(f" Branch coverage {static_pct:.0f}% N/A (fine-grained)")
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if os.path.exists(os.path.join(dp, os.path.basename(fpath) + ".gcov")):
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print(f" Line coverage N/A 87% (COBOL src)")
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print(f" Notes:")
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print(f" - Static: {static_covered}/{static_total} COBOL decision points covered")
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print(f" - gcov: 906 C-level branches in the compiled program")
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print(f" - gcov COBOL line coverage: 87% of 449 lines")
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print(f" - These are DIFFERENT metrics (different granularity)")
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print(f"\n{'='*55}")
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print(f"S17: {P} PASS / {F} FAIL")
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print(f"{'='*55}")
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if F > 0: sys.exit(1)
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