On Tue, Jan 30, 2024 at 06:17:17PM -0800, Andi Kleen wrote:
> Mostly adopted from the existing C musttail plugin tests.
Please add a ChangeLog entry.
> ---
> gcc/testsuite/c-c++-common/musttail1.c | 17 ++++++++++++
> gcc/testsuite/c-c++-common/musttail2.c | 36 +++++++++++++++++++++++++
> gcc/testsuite/c-c++-common/musttail3.c | 31 +++++++++++++++++++++
> gcc/testsuite/c-c++-common/musttail4.c | 19 +++++++++++++
> gcc/testsuite/gcc.dg/musttail-invalid.c | 17 ++++++++++++
> 5 files changed, 120 insertions(+)
> create mode 100644 gcc/testsuite/c-c++-common/musttail1.c
> create mode 100644 gcc/testsuite/c-c++-common/musttail2.c
> create mode 100644 gcc/testsuite/c-c++-common/musttail3.c
> create mode 100644 gcc/testsuite/c-c++-common/musttail4.c
> create mode 100644 gcc/testsuite/gcc.dg/musttail-invalid.c
>
> diff --git a/gcc/testsuite/c-c++-common/musttail1.c
> b/gcc/testsuite/c-c++-common/musttail1.c
> new file mode 100644
> index 000000000000..476185e3ed4b
> --- /dev/null
> +++ b/gcc/testsuite/c-c++-common/musttail1.c
> @@ -0,0 +1,17 @@
> +/* { dg-do compile { target tail_call } } */
> +/* { dg-options "-O2" } */
> +/* { dg-additional-options "-std=c++11" { target c++ } } */
This will run the test only once with -std=c++11. We'll get better coverage
with dropping the line above and using
/* { dg-do compile { target { tail_call && { c || c++11 } } } } */
but here it may not matter.
> +/* { dg-additional-options "-std=c23" { target c } } */
> +/* { dg-additional-options "-fdelayed-branch" { target sparc*-*-* } } */
> +
> +int __attribute__((noinline,noclone))
> +callee (int i)
> +{
> + return i * i;
> +}
> +
> +int __attribute__((noinline,noclone))
> +caller (int i)
> +{
> + [[gnu::musttail]] return callee (i + 1);
> +}
> diff --git a/gcc/testsuite/c-c++-common/musttail2.c
> b/gcc/testsuite/c-c++-common/musttail2.c
> new file mode 100644
> index 000000000000..28f2f68ef13d
> --- /dev/null
> +++ b/gcc/testsuite/c-c++-common/musttail2.c
> @@ -0,0 +1,36 @@
> +/* { dg-do compile { target tail_call } } */
> +/* { dg-additional-options "-std=c++11" { target c++ } } */
> +/* { dg-additional-options "-std=c23" { target c } } */
> +
> +struct box { char field[256]; int i; };
> +
> +int __attribute__((noinline,noclone))
> +test_2_callee (int i, struct box b)
> +{
> + if (b.field[0])
> + return 5;
> + return i * i;
> +}
> +
> +int __attribute__((noinline,noclone))
> +test_2_caller (int i)
> +{
> + struct box b;
> + [[gnu::musttail]] return test_2_callee (i + 1, b); /* { dg-error "cannot
> tail-call: " } */
> +}
> +
> +extern void setjmp (void);
> +void
> +test_3 (void)
> +{
> + [[gnu::musttail]] return setjmp (); /* { dg-error "cannot tail-call: " } */
> +}
> +
> +typedef void (fn_ptr_t) (void);
> +volatile fn_ptr_t fn_ptr;
> +
> +void
> +test_5 (void)
> +{
> + [[gnu::musttail]] return fn_ptr (); /* { dg-error "cannot tail-call: " } */
> +}
> diff --git a/gcc/testsuite/c-c++-common/musttail3.c
> b/gcc/testsuite/c-c++-common/musttail3.c
> new file mode 100644
> index 000000000000..fdbb292944ad
> --- /dev/null
> +++ b/gcc/testsuite/c-c++-common/musttail3.c
> @@ -0,0 +1,31 @@
> +/* { dg-do compile { target tail_call } } */
> +/* { dg-additional-options "-std=c++11" { target c++ } } */
> +/* { dg-additional-options "-std=c23" { target c } } */
> +
> +extern int foo2 (int x, ...);
> +
> +struct str
> +{
> + int a, b;
> +};
> +
> +struct str
> +cstruct (int x)
> +{
> + if (x < 10)
> + [[clang::musttail]] return cstruct (x + 1);
> + return ((struct str){ x, 0 });
> +}
> +
> +int
> +foo (int x)
> +{
> + if (x < 10)
> + [[clang::musttail]] return foo2 (x, 29);
> + if (x < 100)
> + {
> + int k = foo (x + 1);
> + [[clang::musttail]] return k; /* { dg-error "cannot tail-call: " } */
> + }
> + return x;
> +}
> diff --git a/gcc/testsuite/c-c++-common/musttail4.c
> b/gcc/testsuite/c-c++-common/musttail4.c
> new file mode 100644
> index 000000000000..7bf44816f14a
> --- /dev/null
> +++ b/gcc/testsuite/c-c++-common/musttail4.c
> @@ -0,0 +1,19 @@
> +/* { dg-do compile { target tail_call } } */
> +/* { dg-additional-options "-std=c++11" { target c++ } } */
> +/* { dg-additional-options "-std=c23" { target c } } */
> +
> +struct box { char field[64]; int i; };
> +
> +struct box __attribute__((noinline,noclone))
> +returns_struct (int i)
> +{
> + struct box b;
> + b.i = i * i;
> + return b;
> +}
> +
> +int __attribute__((noinline,noclone))
> +test_1 (int i)
> +{
> + [[gnu::musttail]] return returns_struct (i * 5).i; /* { dg-error "cannot
> tail-call: " } */
> +}
> diff --git a/gcc/testsuite/gcc.dg/musttail-invalid.c
> b/gcc/testsuite/gcc.dg/musttail-invalid.c
> new file mode 100644
> index 000000000000..c4725b4b8226
> --- /dev/null
> +++ b/gcc/testsuite/gcc.dg/musttail-invalid.c
Is there a C++ test for the invalid cases?
> @@ -0,0 +1,17 @@
> +/* { dg-do compile } */
> +/* { dg-options "-std=c23" } */
> +
> +[[musttail]] int j; /* { dg-warning "attribute ignored" } */
> +__attribute__((musttail)) int k; /* { dg-warning "attribute directive
> ignored" } */
> +
> +void foo(void)
> +{
> + [[musttail]] j++; /* { dg-warning "attribute ignored" } */
> + [[musttail]] if (k > 0) /* { dg-warning "attribute ignored" } */
> + [[musttail]] k++; /* { dg-warning "attribute ignored" } */
> +}
> +
> +int foo2(int p)
> +{
> + [[gnu::musttail(1)]] return foo2(p + 1); /* { dg-error "has arguments"
> } */
> +}
> --
> 2.43.0
>
Marek
