This revision was landed with ongoing or failed builds.
This revision was automatically updated to reflect the committed changes.
Closed by commit rG570bf972f5ad: [clang][analyzer] Remove report of null stream
from StreamChecker. (authored by balazske).
Changed prior to commit:
https://reviews.llvm.org/D137790?vs=474559&id=487314#toc
Repository:
rG LLVM Github Monorepo
CHANGES SINCE LAST ACTION
https://reviews.llvm.org/D137790/new/
https://reviews.llvm.org/D137790
Files:
clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
clang/test/Analysis/std-c-library-functions-arg-enabled-checkers.c
clang/test/Analysis/std-c-library-functions-arg-weakdeps.c
clang/test/Analysis/stream-noopen.c
clang/test/Analysis/stream-note.c
clang/test/Analysis/stream-stdlibraryfunctionargs.c
clang/test/Analysis/stream.c
Index: clang/test/Analysis/stream.c
===================================================================
--- clang/test/Analysis/stream.c
+++ clang/test/Analysis/stream.c
@@ -2,81 +2,6 @@
#include "Inputs/system-header-simulator.h"
-void check_fread(void) {
- FILE *fp = tmpfile();
- fread(0, 0, 0, fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_fwrite(void) {
- FILE *fp = tmpfile();
- fwrite(0, 0, 0, fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_fseek(void) {
- FILE *fp = tmpfile();
- fseek(fp, 0, 0); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_ftell(void) {
- FILE *fp = tmpfile();
- ftell(fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_rewind(void) {
- FILE *fp = tmpfile();
- rewind(fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_fgetpos(void) {
- FILE *fp = tmpfile();
- fpos_t pos;
- fgetpos(fp, &pos); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_fsetpos(void) {
- FILE *fp = tmpfile();
- fpos_t pos;
- fsetpos(fp, &pos); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_clearerr(void) {
- FILE *fp = tmpfile();
- clearerr(fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_feof(void) {
- FILE *fp = tmpfile();
- feof(fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_ferror(void) {
- FILE *fp = tmpfile();
- ferror(fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void check_fileno(void) {
- FILE *fp = tmpfile();
- fileno(fp); // expected-warning {{Stream pointer might be NULL}}
- fclose(fp);
-}
-
-void f_open(void) {
- FILE *p = fopen("foo", "r");
- char buf[1024];
- fread(buf, 1, 1, p); // expected-warning {{Stream pointer might be NULL}}
- fclose(p);
-}
-
void f_seek(void) {
FILE *p = fopen("foo", "r");
if (!p)
@@ -161,7 +86,7 @@
}
void check_freopen_1(void) {
- FILE *f1 = freopen("foo.c", "r", (FILE *)0); // expected-warning {{Stream pointer might be NULL}}
+ FILE *f1 = freopen("foo.c", "r", (FILE *)0); // Not reported by the stream checker.
f1 = freopen(0, "w", (FILE *)0x123456); // Do not report this as error.
}
Index: clang/test/Analysis/stream-stdlibraryfunctionargs.c
===================================================================
--- /dev/null
+++ clang/test/Analysis/stream-stdlibraryfunctionargs.c
@@ -0,0 +1,142 @@
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream,alpha.unix.StdCLibraryFunctionArgs,debug.ExprInspection \
+// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:ModelPOSIX=true -verify=stdargs,any %s
+
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream,debug.ExprInspection \
+// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:ModelPOSIX=true -verify=any %s
+
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.StdCLibraryFunctionArgs,debug.ExprInspection \
+// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:ModelPOSIX=true -verify=stdargs,any %s
+
+#include "Inputs/system-header-simulator.h"
+
+extern void clang_analyzer_eval(int);
+
+void *buf;
+size_t size;
+size_t n;
+
+void test_fopen(void) {
+ FILE *fp = fopen("path", "r");
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}} any-warning{{FALSE}}
+ fclose(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+}
+
+void test_tmpfile(void) {
+ FILE *fp = tmpfile();
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}} any-warning{{FALSE}}
+ fclose(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+}
+
+void test_fclose(void) {
+ FILE *fp = tmpfile();
+ fclose(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+}
+
+void test_freopen(void) {
+ FILE *fp = tmpfile();
+ fp = freopen("file", "w", fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 3rd argument should not be NULL}}
+ fclose(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+}
+
+void test_fread(void) {
+ FILE *fp = tmpfile();
+ size_t ret = fread(buf, size, n, fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 4th argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ clang_analyzer_eval(ret <= n); // any-warning{{TRUE}}
+ clang_analyzer_eval(ret == n); // any-warning{{TRUE}} any-warning{{FALSE}}
+
+ fclose(fp);
+}
+
+void test_fwrite(void) {
+ FILE *fp = tmpfile();
+ size_t ret = fwrite(buf, size, n, fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 4th argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ clang_analyzer_eval(ret <= n); // any-warning{{TRUE}}
+ clang_analyzer_eval(ret == n); // any-warning{{TRUE}} any-warning{{FALSE}}
+
+ fclose(fp);
+}
+
+void test_fseek(void) {
+ FILE *fp = tmpfile();
+ fseek(fp, 0, 0); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_ftell(void) {
+ FILE *fp = tmpfile();
+ ftell(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_rewind(void) {
+ FILE *fp = tmpfile();
+ rewind(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_fgetpos(void) {
+ FILE *fp = tmpfile();
+ fpos_t pos;
+ fgetpos(fp, &pos); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_fsetpos(void) {
+ FILE *fp = tmpfile();
+ fpos_t pos;
+ fsetpos(fp, &pos); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_clearerr(void) {
+ FILE *fp = tmpfile();
+ clearerr(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_feof(void) {
+ FILE *fp = tmpfile();
+ feof(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_ferror(void) {
+ FILE *fp = tmpfile();
+ ferror(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
+
+void test_fileno(void) {
+ FILE *fp = tmpfile();
+ fileno(fp); // stdargs-warning{{Function argument constraint is not satisfied}} \
+ // stdargs-note{{The 1st argument should not be NULL}}
+ clang_analyzer_eval(fp != NULL); // any-warning{{TRUE}}
+ fclose(fp);
+}
Index: clang/test/Analysis/stream-note.c
===================================================================
--- clang/test/Analysis/stream-note.c
+++ clang/test/Analysis/stream-note.c
@@ -1,4 +1,7 @@
-// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream -analyzer-output text -verify %s
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream -analyzer-output text \
+// RUN: -verify %s
+// RUN: %clang_analyze_cc1 -analyzer-checker=core,alpha.unix.Stream,alpha.unix.StdCLibraryFunctionArgs -analyzer-output text \
+// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:ModelPOSIX=true -verify=expected,stdargs %s
#include "Inputs/system-header-simulator.h"
@@ -80,13 +83,14 @@
void check_track_null(void) {
FILE *F;
- F = fopen("foo1.c", "r"); // expected-note {{Value assigned to 'F'}} expected-note {{Assuming pointer value is null}}
- if (F != NULL) { // expected-note {{Taking false branch}} expected-note {{'F' is equal to NULL}}
+ F = fopen("foo1.c", "r"); // stdargs-note {{Value assigned to 'F'}} stdargs-note {{Assuming pointer value is null}}
+ if (F != NULL) { // stdargs-note {{Taking false branch}} stdargs-note {{'F' is equal to NULL}}
fclose(F);
return;
}
- fclose(F); // expected-warning {{Stream pointer might be NULL}}
- // expected-note@-1 {{Stream pointer might be NULL}}
+ fclose(F); // stdargs-warning {{Function argument constraint is not satisfied}}
+ // stdargs-note@-1 {{Function argument constraint is not satisfied}}
+ // stdargs-note@-2 {{The 1st argument should not be NULL}}
}
void check_eof_notes_feof_after_feof(void) {
Index: clang/test/Analysis/stream-noopen.c
===================================================================
--- clang/test/Analysis/stream-noopen.c
+++ clang/test/Analysis/stream-noopen.c
@@ -33,9 +33,11 @@
void test_fread(FILE *F) {
size_t Ret = fread(RBuf, 1, 10, F);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret == 10) {
if (errno) {} // expected-warning{{undefined}}
} else {
+ clang_analyzer_eval(Ret < 10); // expected-warning {{TRUE}}
clang_analyzer_eval(errno != 0); // expected-warning {{TRUE}}
}
clang_analyzer_eval(feof(F)); // expected-warning {{UNKNOWN}}
@@ -44,9 +46,11 @@
void test_fwrite(FILE *F) {
size_t Ret = fwrite(WBuf, 1, 10, F);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret == 10) {
if (errno) {} // expected-warning{{undefined}}
} else {
+ clang_analyzer_eval(Ret < 10); // expected-warning {{TRUE}}
clang_analyzer_eval(errno != 0); // expected-warning {{TRUE}}
}
clang_analyzer_eval(feof(F)); // expected-warning {{UNKNOWN}}
@@ -55,6 +59,7 @@
void test_fclose(FILE *F) {
int Ret = fclose(F);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret == 0) {
if (errno) {} // expected-warning{{undefined}}
} else {
@@ -67,6 +72,7 @@
void test_fseek(FILE *F) {
int Ret = fseek(F, SEEK_SET, 1);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret == 0) {
if (errno) {} // expected-warning{{undefined}}
} else {
@@ -81,6 +87,7 @@
errno = 0;
fpos_t Pos;
int Ret = fgetpos(F, &Pos);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret)
clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
else
@@ -95,6 +102,7 @@
errno = 0;
fpos_t Pos;
int Ret = fsetpos(F, &Pos);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret)
clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
else
@@ -108,6 +116,7 @@
void check_ftell(FILE *F) {
errno = 0;
long Ret = ftell(F);
+ clang_analyzer_eval(F != NULL); // expected-warning {{TRUE}}
if (Ret == -1) {
clang_analyzer_eval(errno != 0); // expected-warning{{TRUE}}
} else {
@@ -120,6 +129,42 @@
clang_analyzer_eval(ferror(F)); // expected-warning {{UNKNOWN}}
}
+void test_rewind(FILE *F) {
+ errno = 0;
+ rewind(F);
+ clang_analyzer_eval(F != NULL); // expected-warning{{TRUE}}
+ clang_analyzer_eval(errno == 0); // expected-warning{{TRUE}}
+ // expected-warning@-1{{FALSE}}
+ rewind(F);
+}
+
+void test_feof(FILE *F) {
+ errno = 0;
+ feof(F);
+ clang_analyzer_eval(F != NULL); // expected-warning{{TRUE}}
+ if (errno) {} // no-warning
+ clang_analyzer_eval(errno == 0); // expected-warning{{TRUE}}
+ // expected-warning@-1{{FALSE}}
+}
+
+void test_ferror(FILE *F) {
+ errno = 0;
+ ferror(F);
+ clang_analyzer_eval(F != NULL); // expected-warning{{TRUE}}
+ if (errno) {} // no-warning
+ clang_analyzer_eval(errno == 0); // expected-warning{{TRUE}}
+ // expected-warning@-1{{FALSE}}
+}
+
+void test_clearerr(FILE *F) {
+ errno = 0;
+ clearerr(F);
+ clang_analyzer_eval(F != NULL); // expected-warning{{TRUE}}
+ if (errno) {} // no-warning
+ clang_analyzer_eval(errno == 0); // expected-warning{{TRUE}}
+ // expected-warning@-1{{FALSE}}
+}
+
void freadwrite_zerosize(FILE *F) {
fwrite(WBuf, 1, 0, F);
clang_analyzer_eval(feof(F)); // expected-warning {{UNKNOWN}}
Index: clang/test/Analysis/std-c-library-functions-arg-weakdeps.c
===================================================================
--- clang/test/Analysis/std-c-library-functions-arg-weakdeps.c
+++ clang/test/Analysis/std-c-library-functions-arg-weakdeps.c
@@ -6,7 +6,6 @@
// RUN: -analyzer-checker=apiModeling.StdCLibraryFunctions \
// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:ModelPOSIX=true \
// RUN: -analyzer-checker=alpha.unix.StdCLibraryFunctionArgs \
-// RUN: -analyzer-checker=alpha.unix.Stream \
// RUN: -triple x86_64-unknown-linux-gnu \
// RUN: -verify
@@ -18,7 +17,6 @@
// RUN: -analyzer-checker=apiModeling.StdCLibraryFunctions \
// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:ModelPOSIX=true \
// RUN: -analyzer-checker=alpha.unix.StdCLibraryFunctionArgs \
-// RUN: -analyzer-checker=alpha.unix.Stream \
// RUN: -analyzer-config apiModeling.StdCLibraryFunctions:DisplayLoadedSummaries=true \
// RUN: -triple x86_64-unknown-linux 2>&1 | FileCheck %s
@@ -57,8 +55,3 @@
fread(p, sizeof(int), 5, F); // \
expected-warning{{Null pointer passed to 1st parameter expecting 'nonnull' [core.NonNullParamChecker]}}
}
-
-void test_notnull_stream_arg(void) {
- fileno(0); // \
- // expected-warning{{Stream pointer might be NULL [alpha.unix.Stream]}}
-}
Index: clang/test/Analysis/std-c-library-functions-arg-enabled-checkers.c
===================================================================
--- clang/test/Analysis/std-c-library-functions-arg-enabled-checkers.c
+++ clang/test/Analysis/std-c-library-functions-arg-enabled-checkers.c
@@ -18,9 +18,9 @@
// CHECK-NEXT: core.CallAndMessageModeling
// CHECK-NEXT: core.CallAndMessage
// CHECK-NEXT: core.NonNullParamChecker
-// CHECK-NEXT: alpha.unix.Stream
// CHECK-NEXT: apiModeling.StdCLibraryFunctions
// CHECK-NEXT: alpha.unix.StdCLibraryFunctionArgs
+// CHECK-NEXT: alpha.unix.Stream
// CHECK-NEXT: apiModeling.Errno
// CHECK-NEXT: apiModeling.TrustNonnull
// CHECK-NEXT: apiModeling.TrustReturnsNonnull
Index: clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
===================================================================
--- clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
+++ clang/lib/StaticAnalyzer/Checkers/StreamChecker.cpp
@@ -209,7 +209,6 @@
class StreamChecker : public Checker<check::PreCall, eval::Call,
check::DeadSymbols, check::PointerEscape> {
- BugType BT_FileNull{this, "NULL stream pointer", "Stream handling error"};
BugType BT_UseAfterClose{this, "Closed stream", "Stream handling error"};
BugType BT_UseAfterOpenFailed{this, "Invalid stream",
"Stream handling error"};
@@ -338,7 +337,7 @@
const StreamErrorState &ErrorKind) const;
/// Check that the stream (in StreamVal) is not NULL.
- /// If it can only be NULL a fatal error is emitted and nullptr returned.
+ /// If it can only be NULL a sink node is generated and nullptr returned.
/// Otherwise the return value is a new state where the stream is constrained
/// to be non-null.
ProgramStateRef ensureStreamNonNull(SVal StreamVal, const Expr *StreamE,
@@ -1039,13 +1038,11 @@
std::tie(StateNotNull, StateNull) = CM.assumeDual(C.getState(), *Stream);
if (!StateNotNull && StateNull) {
- if (ExplodedNode *N = C.generateErrorNode(StateNull)) {
- auto R = std::make_unique<PathSensitiveBugReport>(
- BT_FileNull, "Stream pointer might be NULL.", N);
- if (StreamE)
- bugreporter::trackExpressionValue(N, StreamE, *R);
- C.emitReport(std::move(R));
- }
+ // Stream argument is NULL, stop analysis on this path.
+ // This case should occur only if StdLibraryFunctionsChecker (or ModelPOSIX
+ // option of it) is not turned on, otherwise that checker ensures non-null
+ // argument.
+ C.generateSink(StateNull, C.getPredecessor());
return nullptr;
}
Index: clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
===================================================================
--- clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
+++ clang/include/clang/StaticAnalyzer/Checkers/Checkers.td
@@ -588,7 +588,7 @@
"such as whether the parameter of isalpha is in the range [0, 255] "
"or is EOF.">,
Dependencies<[StdCLibraryFunctionsChecker]>,
- WeakDependencies<[CallAndMessageChecker, NonNullParamChecker, StreamChecker]>,
+ WeakDependencies<[CallAndMessageChecker, NonNullParamChecker]>,
Documentation<HasDocumentation>;
} // end "alpha.unix"
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