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[Analyzer][StreamChecker] Add note tags for file opening.
Summary: Bug reports of resource leak are now improved. If there are multiple resource leak paths for the same stream, only one wil be reported. Reviewers: Szelethus, xazax.hun, baloghadamsoftware, NoQ Reviewed By: Szelethus, NoQ Subscribers: NoQ, rnkovacs, xazax.hun, baloghadamsoftware, szepet, a.sidorin, mikhail.ramalho, Szelethus, donat.nagy, dkrupp, gamesh411, Charusso, martong, ASDenysPetrov, cfe-commits Tags: #clang Differential Revision: https://reviews.llvm.org/D81407
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Original file line number | Diff line number | Diff line change |
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@@ -0,0 +1,48 @@ | ||
// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream -analyzer-output text -verify %s | ||
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#include "Inputs/system-header-simulator.h" | ||
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void check_note_at_correct_open() { | ||
FILE *F1 = tmpfile(); // expected-note {{Stream opened here}} | ||
if (!F1) | ||
// expected-note@-1 {{'F1' is non-null}} | ||
// expected-note@-2 {{Taking false branch}} | ||
return; | ||
FILE *F2 = tmpfile(); | ||
if (!F2) { | ||
// expected-note@-1 {{'F2' is non-null}} | ||
// expected-note@-2 {{Taking false branch}} | ||
fclose(F1); | ||
return; | ||
} | ||
rewind(F2); | ||
fclose(F2); | ||
rewind(F1); | ||
} | ||
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}} | ||
// expected-note@-2 {{Opened stream never closed. Potential resource leak}} | ||
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void check_note_fopen() { | ||
FILE *F = fopen("file", "r"); // expected-note {{Stream opened here}} | ||
if (!F) | ||
// expected-note@-1 {{'F' is non-null}} | ||
// expected-note@-2 {{Taking false branch}} | ||
return; | ||
} | ||
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}} | ||
// expected-note@-2 {{Opened stream never closed. Potential resource leak}} | ||
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void check_note_freopen() { | ||
FILE *F = fopen("file", "r"); // expected-note {{Stream opened here}} | ||
if (!F) | ||
// expected-note@-1 {{'F' is non-null}} | ||
// expected-note@-2 {{Taking false branch}} | ||
return; | ||
F = freopen(0, "w", F); // expected-note {{Stream reopened here}} | ||
if (!F) | ||
// expected-note@-1 {{'F' is non-null}} | ||
// expected-note@-2 {{Taking false branch}} | ||
return; | ||
} | ||
// expected-warning@-1 {{Opened stream never closed. Potential resource leak}} | ||
// expected-note@-2 {{Opened stream never closed. Potential resource leak}} |
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