// POSIX setjmp.h
LIBBUILTIN(_longjmp, "vJi", "fr", "setjmp.h", ALL_LANGUAGES)
LIBBUILTIN(siglongjmp, "vSJi", "fr", "setjmp.h", ALL_LANGUAGES)
-// non-standard but very common
-LIBBUILTIN(strlcpy, "zc*cC*z", "f", "string.h", ALL_LANGUAGES)
-LIBBUILTIN(strlcat, "zc*cC*z", "f", "string.h", ALL_LANGUAGES)
// id objc_msgSend(id, SEL, ...)
LIBBUILTIN(objc_msgSend, "GGH.", "f", "objc/message.h", OBJC_LANG)
TheCall->getCallee()->getLocStart());
}
- // Builtin handling
+ // Memset/memcpy/memmove/memcmp handling
int CMF = -1;
switch (FDecl->getBuiltinID()) {
case Builtin::BI__builtin_memset:
case Builtin::BImemmove:
CMF = CMF_Memmove;
break;
-
- case Builtin::BIstrlcpy:
- case Builtin::BIstrlcat:
- CheckStrlcpycatArguments(TheCall, FnInfo);
- break;
case Builtin::BI__builtin_memcmp:
CMF = CMF_Memcmp;
break;
}
- // Memset/memcpy/memmove handling
if (CMF != -1)
CheckMemaccessArguments(TheCall, CheckedMemoryFunction(CMF), FnInfo);
}
}
-// A little helper routine: ignore addition and subtraction of integer literals.
-// This intentionally does not ignore all integer constant expressions because
-// we don't want to remove sizeof().
-static const Expr *ignoreLiteralAdditions(const Expr *Ex, ASTContext &Ctx) {
- Ex = Ex->IgnoreParenCasts();
-
- for (;;) {
- const BinaryOperator * BO = dyn_cast<BinaryOperator>(Ex);
- if (!BO || !BO->isAdditiveOp())
- break;
-
- const Expr *RHS = BO->getRHS()->IgnoreParenCasts();
- const Expr *LHS = BO->getLHS()->IgnoreParenCasts();
-
- if (isa<IntegerLiteral>(RHS))
- Ex = LHS;
- else if (isa<IntegerLiteral>(LHS))
- Ex = RHS;
- else
- break;
- }
-
- return Ex;
-}
-
-// Warn if the user has made the 'size' argument to strlcpy or strlcat
-// be the size of the source, instead of the destination.
-void Sema::CheckStrlcpycatArguments(const CallExpr *Call,
- IdentifierInfo *FnName) {
-
- // Don't crash if the user has the wrong number of arguments
- if (Call->getNumArgs() != 3)
- return;
-
- const Expr *SrcArg = ignoreLiteralAdditions(Call->getArg(1), Context);
- const Expr *SizeArg = ignoreLiteralAdditions(Call->getArg(2), Context);
- const Expr *CompareWithSrc = NULL;
-
- // Look for 'strlcpy(dst, x, sizeof(x))'
- if (const Expr *Ex = getSizeOfExprArg(SizeArg))
- CompareWithSrc = Ex;
- else {
- // Look for 'strlcpy(dst, x, strlen(x))'
- if (const CallExpr *SizeCall = dyn_cast<CallExpr>(SizeArg)) {
- if (SizeCall->isBuiltinCall(Context) == Builtin::BIstrlen
- && SizeCall->getNumArgs() == 1)
- CompareWithSrc = ignoreLiteralAdditions(SizeCall->getArg(0), Context);
- }
- }
-
- if (!CompareWithSrc)
- return;
-
- // Determine if the argument to sizeof/strlen is equal to the source
- // argument. In principle there's all kinds of things you could do
- // here, for instance creating an == expression and evaluating it with
- // EvaluateAsBooleanCondition, but this uses a more direct technique:
- const DeclRefExpr *SrcArgDRE = dyn_cast<DeclRefExpr>(SrcArg);
- if (!SrcArgDRE)
- return;
-
- const DeclRefExpr *CompareWithSrcDRE = dyn_cast<DeclRefExpr>(CompareWithSrc);
- if (!CompareWithSrcDRE ||
- SrcArgDRE->getDecl() != CompareWithSrcDRE->getDecl())
- return;
-
- const Expr *OriginalSizeArg = Call->getArg(2);
- Diag(CompareWithSrcDRE->getLocStart(), diag::warn_strlcpycat_wrong_size)
- << OriginalSizeArg->getSourceRange() << FnName;
-
- // Output a FIXIT hint if the destination is an array (rather than a
- // pointer to an array). This could be enhanced to handle some
- // pointers if we know the actual size, like if DstArg is 'array+2'
- // we could say 'sizeof(array)-2'.
- const Expr *DstArg = Call->getArg(0)->IgnoreParenImpCasts();
-
- if (DstArg->getType()->isArrayType()) {
- llvm::SmallString<128> sizeString;
- llvm::raw_svector_ostream OS(sizeString);
- OS << "sizeof(";
- DstArg->printPretty(OS, Context, 0, Context.PrintingPolicy);
- OS << ")";
-
- Diag(OriginalSizeArg->getLocStart(), diag::note_strlcpycat_wrong_size)
- << FixItHint::CreateReplacement(OriginalSizeArg->getSourceRange(),
- OS.str());
- }
-}
-
//===--- CHECK: Return Address of Stack Variable --------------------------===//
static Expr *EvalVal(Expr *E, SmallVectorImpl<DeclRefExpr *> &refVars);
+++ /dev/null
-// RUN: %clang_cc1 -Wstrlcpy-size -verify -fsyntax-only %s
-
-typedef unsigned long size_t;
-size_t strlcpy (char * restrict dst, const char * restrict src, size_t size);
-size_t strlcat (char * restrict dst, const char * restrict src, size_t size);
-size_t strlen (const char *s);
-
-char s1[100];
-char s2[200];
-char * s3;
-
-struct {
- char f1[100];
- char f2[100][3];
-} s4, **s5;
-
-int x;
-
-void f(void)
-{
- strlcpy(s1, s2, sizeof(s1)); // no warning
- strlcpy(s1, s2, sizeof(s2)); // expected-warning {{size argument in 'strlcpy' call appears to be size of the source; expected the size of the destination}} expected-note {{change size argument to be the size of the destination}}
- strlcpy(s1, s3, strlen(s3)+1); // expected-warning {{size argument in 'strlcpy' call appears to be size of the source; expected the size of the destination}} expected-note {{change size argument to be the size of the destination}}
- strlcat(s2, s3, sizeof(s3)); // expected-warning {{size argument in 'strlcat' call appears to be size of the source; expected the size of the destination}} expected-note {{change size argument to be the size of the destination}}
- strlcpy(s4.f1, s2, sizeof(s2)); // expected-warning {{size argument in 'strlcpy' call appears to be size of the source; expected the size of the destination}} expected-note {{change size argument to be the size of the destination}}
- strlcpy((*s5)->f2[x], s2, sizeof(s2)); // expected-warning {{size argument in 'strlcpy' call appears to be size of the source; expected the size of the destination}} expected-note {{change size argument to be the size of the destination}}
- strlcpy(s1+3, s2, sizeof(s2)); // expected-warning {{size argument in 'strlcpy' call appears to be size of the source; expected the size of the destination}}
-}
projects / clang / commitdiff