Index: clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp =================================================================== --- clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp +++ clang/lib/StaticAnalyzer/Core/BugReporterVisitors.cpp @@ -833,16 +833,36 @@ return; // First, find when we processed the statement. + // If we work with a 'CXXNewExpr' that is going to be purged away before + // its call take place. We would catch that purge in the last condition + // as a 'StmtPoint' so we have to bypass it. + const bool BypassCXXNewExprEval = isa(S); + + // This is moving forward when we enter into another context. + const StackFrameContext *CurrentSFC = Node->getStackFrame(); + do { - if (auto CEE = Node->getLocationAs()) + // If that is satisfied we found our statement as an inlined call. + if (Optional CEE = Node->getLocationAs()) if (CEE->getCalleeContext()->getCallSite() == S) break; - if (auto SP = Node->getLocationAs()) - if (SP->getStmt() == S) - break; + // Try to move forward to the end of the call-chain. Node = Node->getFirstPred(); - } while (Node); + if (!Node) + break; + + CurrentSFC = Node->getStackFrame(); + + // If that is satisfied we found our statement. + // FIXME: This code currently bypasses the call site for the + // conservatively evaluated allocator. + if (!BypassCXXNewExprEval) + if (Optional SP = Node->getLocationAs()) + if (SP->getStmt() == S && SP->getStackFrame() == CurrentSFC) + break; + + } while (Node->getStackFrame() == CurrentSFC); // Next, step over any post-statement checks. while (Node && Node->getLocation().getAs()) Index: clang/test/Analysis/inlining/placement-new-fp-suppression.cpp =================================================================== --- /dev/null +++ clang/test/Analysis/inlining/placement-new-fp-suppression.cpp @@ -0,0 +1,137 @@ +// RUN: %clang_analyze_cc1 \ +// RUN: -analyzer-checker=core.CallAndMessage \ +// RUN: -analyzer-config suppress-null-return-paths=false \ +// RUN: -verify %s +// RUN: %clang_analyze_cc1 \ +// RUN: -analyzer-checker=core.CallAndMessage \ +// RUN: -DSUPPRESSED \ +// RUN: -verify %s + +#ifdef SUPPRESSED +// expected-no-diagnostics +#endif + +#include "../Inputs/system-header-simulator-cxx.h" + +typedef unsigned long uintptr_t; + +void error(); +void *malloc(size_t); + + +// From llvm/include/llvm/Support/MathExtras.h +inline uintptr_t alignAddr(const void *Addr, size_t Alignment) { + return (((uintptr_t)Addr + Alignment - 1) & ~(uintptr_t)(Alignment - 1)); +} + +inline size_t alignmentAdjustment(const void *Ptr, size_t Alignment) { + return alignAddr(Ptr, Alignment) - (uintptr_t)Ptr; +} + + +// From llvm/include/llvm/Support/MemAlloc.h +inline void *safe_malloc(size_t Sz) { + void *Result = malloc(Sz); + if (Result == nullptr) + error(); + + return Result; +} + + +// From llvm/include/llvm/Support/Allocator.h +class MallocAllocator { +public: + void *Allocate(size_t Size, size_t /*Alignment*/) { + return safe_malloc(Size); + } +}; + +class BumpPtrAllocator { +public: + void *Allocate(size_t Size, size_t Alignment) { + BytesAllocated += Size; + size_t Adjustment = alignmentAdjustment(CurPtr, Alignment); + size_t SizeToAllocate = Size; + + size_t PaddedSize = SizeToAllocate + Alignment - 1; + uintptr_t AlignedAddr = alignAddr(Allocator.Allocate(PaddedSize, 0), + Alignment); + char *AlignedPtr = (char*)AlignedAddr; + + return AlignedPtr; + } + +private: + char *CurPtr = nullptr; + size_t BytesAllocated = 0; + MallocAllocator Allocator; +}; + + +// From clang/include/clang/AST/ASTContextAllocate.h +class ASTContext; + +void *operator new(size_t Bytes, const ASTContext &C, size_t Alignment = 8); +void *operator new[](size_t Bytes, const ASTContext &C, size_t Alignment = 8); + + +// From clang/include/clang/AST/ASTContext.h +class ASTContext { +public: + void *Allocate(size_t Size, unsigned Align = 8) const { + return BumpAlloc.Allocate(Size, Align); + } + + template + T *Allocate(size_t Num = 1) const { + return static_cast(Allocate(Num * sizeof(T), alignof(T))); + } + +private: + mutable BumpPtrAllocator BumpAlloc; +}; + + +// From clang/include/clang/AST/ASTContext.h +inline void *operator new(size_t Bytes, const ASTContext &C, + size_t Alignment /* = 8 */) { + return C.Allocate(Bytes, Alignment); +} + +inline void *operator new[](size_t Bytes, const ASTContext &C, + size_t Alignment /* = 8 */) { + return C.Allocate(Bytes, Alignment); +} + + +// From clang/include/clang/AST/Attr.h +void *operator new(size_t Bytes, ASTContext &C, + size_t Alignment = 8) noexcept { + return ::operator new(Bytes, C, Alignment); +} + + +class A { +public: + void setValue(int value) { Value = value; } +private: + int Value; +}; + +void f(const ASTContext &C) { + A *a = new (C) A; + a->setValue(13); +#ifndef SUPPRESSED + // expected-warning@-2 {{Called C++ object pointer is null}} +#endif +} + +void g(const ASTContext &C) { + A *a = new (C) A[1]; + a[0].setValue(13); +#ifndef SUPPRESSED + // expected-warning@-2 {{Called C++ object pointer is null}} +#endif +} + Index: clang/test/Analysis/new-ctor-null-throw.cpp =================================================================== --- clang/test/Analysis/new-ctor-null-throw.cpp +++ clang/test/Analysis/new-ctor-null-throw.cpp @@ -1,4 +1,9 @@ -// RUN: %clang_analyze_cc1 -w -analyzer-checker=core,debug.ExprInspection -analyzer-config c++-allocator-inlining=true -std=c++11 -verify %s +// RUN: %clang_analyze_cc1 -analyzer-checker=core \ +// RUN: -analyzer-config suppress-null-return-paths=false \ +// RUN: -verify %s +// RUN: %clang_analyze_cc1 -analyzer-checker=core \ +// RUN: -DSUPPRESSED \ +// RUN: -verify %s void clang_analyzer_eval(bool); @@ -9,18 +14,41 @@ // operator new. void *operator new(size_t size) { return nullptr; + // expected-warning@-1 {{'operator new' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}} } void *operator new[](size_t size) { return nullptr; + // expected-warning@-1 {{'operator new[]' should not return a null pointer unless it is declared 'throw()' or 'noexcept'}} } struct S { int x; S() : x(1) {} ~S() {} + int getX() const { return x; } }; void testArrays() { S *s = new S[10]; // no-crash - s[0].x = 2; // expected-warning{{Dereference of null pointer}} + s[0].x = 2; +#ifndef SUPPRESSED + // expected-warning@-2 {{Dereference of null pointer}} +#endif } + +void testCtor() { + S *s = new S(); + s->x = 13; +#ifndef SUPPRESSED + // expected-warning@-2 {{Access to field 'x' results in a dereference of a null pointer (loaded from variable 's')}} +#endif +} + +void testMethod() { + S *s = new S(); + const int X = s->getX(); +#ifndef SUPPRESSED + // expected-warning@-2 {{Called C++ object pointer is null}} +#endif +} + Index: clang/test/Analysis/new-ctor-null.cpp =================================================================== --- clang/test/Analysis/new-ctor-null.cpp +++ clang/test/Analysis/new-ctor-null.cpp @@ -1,4 +1,6 @@ -// RUN: %clang_analyze_cc1 -analyzer-checker=core,debug.ExprInspection -analyzer-config c++-allocator-inlining=true -std=c++11 -verify %s +// RUN: %clang_analyze_cc1 \ +// RUN: -analyzer-checker=core,debug.ExprInspection \ +// RUN: -verify %s void clang_analyzer_eval(bool); void clang_analyzer_warnIfReached(); @@ -24,7 +26,8 @@ void testArrays() { S *s = new S[10]; // no-crash - s[0].x = 2; // expected-warning{{Dereference of null pointer}} + s[0].x = 2; + // no-warning: 'Dereference of null pointer' suppressed by ReturnVisitor. } int global;