clang/test/CodeGenCXX/operator-new.cpp

// RUN: %clang_cc1 -triple i686-pc-linux-gnu -emit-llvm -o %t-1.ll %s
// RUN: FileCheck --check-prefix=ALL -check-prefix SANE --input-file=%t-1.ll %s
// RUN: %clang_cc1 -triple i686-pc-linux-gnu -emit-llvm -fno-assume-sane-operator-new -o %t-2.ll %s
// RUN: FileCheck --check-prefix=ALL -check-prefix SANENOT --input-file=%t-2.ll %s

class teste {
  int A;
public:
  teste() : A(2) {}
};

void f1() {
  // ALL: declare noundef nonnull ptr @_Znwj(
  new teste();
}

// operator new should check for overflow in multiply.
void *f2(long N) {
  return new int[N];

  // ALL:      [[UWO:%.*]] = call {{.*}} @llvm.umul.with.overflow
  // ALL-NEXT: [[OVER:%.*]] = extractvalue {{.*}} [[UWO]], 1
  // ALL-NEXT: [[SUM:%.*]] = extractvalue {{.*}} [[UWO]], 0
  // ALL-NEXT: [[RESULT:%.*]] = select i1 [[OVER]], i32 -1, i32 [[SUM]]
  // SANE-NEXT: call noalias noundef nonnull ptr @_Znaj(i32 noundef [[RESULT]]) [[ATTR:#[0-9]+]]
  // SANENOT-NEXT: call noundef nonnull ptr @_Znaj(i32 noundef [[RESULT]]) [[ATTR:#[0-9]+]]
}

// ALL: declare noundef nonnull ptr @_Znaj(

void *f3(unsigned long N) {
  // SANE: call noalias noundef nonnull ptr @_Znwj(i32 noundef {{.*}}) [[ATTR2:#[0-9]+]]
  // SANENOT: call noundef nonnull ptr @_Znwj(i32 noundef {{.*}}) [[ATTR2:#[0-9]+]]
  return ::operator new(N);
}

// SANE: attributes [[ATTR]] = { builtin allocsize(0) memory(inaccessiblemem: readwrite, errnomem: write) }
// SANE: attributes [[ATTR2]] = { allocsize(0) }
// SANENOT: attributes [[ATTR]] = { builtin allocsize(0) }
// SANENOT: attributes [[ATTR2]] = { allocsize(0) }