[clang] [clang][analyzer] Support 'fflush' in the StdLibraryFunctionsChecker (PR #76557)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->
@llvm/pr-subscribers-clang

@llvm/pr-subscribers-clang-static-analyzer-1

Author: Ben Shi (benshi001)

<details>
<summary>Changes</summary>



---
Full diff: https://github.com/llvm/llvm-project/pull/76557.diff


2 Files Affected:

- (modified) clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp (+8) 
- (modified) clang/test/Analysis/stream-errno.c (+26) 


``````````diff
diff --git a/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp
index fffcaf7ed18fb7..4ca49b9c0546d9 100644
--- a/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/StdLibraryFunctionsChecker.cpp
@@ -2244,6 +2244,14 @@ void StdLibraryFunctionsChecker::initFunctionSummaries(
             .ArgConstraint(NotNull(ArgNo(0)))
             .ArgConstraint(NotNull(ArgNo(1))));
 
+    // int fflush(FILE *stream);
+    addToFunctionSummaryMap(
+        "fflush", Signature(ArgTypes{FilePtrTy}, RetType{IntTy}),
+        Summary(NoEvalCall)
+            .Case(ReturnsZero, ErrnoMustNotBeChecked, GenericSuccessMsg)
+            .Case({ReturnValueCondition(WithinRange, SingleValue(EOFv))},
+                  ErrnoNEZeroIrrelevant, GenericFailureMsg));
+
     // long ftell(FILE *stream);
     // From 'The Open Group Base Specifications Issue 7, 2018 edition':
     // "The ftell() function shall not change the setting of errno if
diff --git a/clang/test/Analysis/stream-errno.c b/clang/test/Analysis/stream-errno.c
index bf0a61db2424f9..d52480741d4cd1 100644
--- a/clang/test/Analysis/stream-errno.c
+++ b/clang/test/Analysis/stream-errno.c
@@ -222,3 +222,29 @@ void check_fileno(void) {
   }
   if (errno) {} // expected-warning{{An undefined value may be read from 'errno'}}
 }
+
+void check_fflush_0(void) {
+  FILE *F = tmpfile();
+  if (!F)
+    return;
+  int N = fflush(F);
+  if (N == EOF) {
+    clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
+    if (errno) {}                    // no-warning
+  } else {
+    clang_analyzer_eval(N == 0);     // expected-warning{{TRUE}}
+    if (errno) {}                    // expected-warning{{An undefined value may be read from 'errno'}}
+  }
+  fclose(F);
+}
+
+void check_fflush_1(void) {
+  int N = fflush(NULL);
+  if (N == 0) {
+    if (errno) {}                    // expected-warning{{An undefined value may be read from 'errno'}}
+  } else {
+    clang_analyzer_eval(N == EOF);   // expected-warning{{TRUE}}
+    clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
+    if (errno) {}                    // no-warning
+  }
+}

``````````

</details>


https://github.com/llvm/llvm-project/pull/76557