4f80c064eb
In the libc++ test suite, we consistently declare main() functions with full parameters and explicitly return from the function. This helps code that compiles the tests with -ffreestanding, where main() is not a special function (with an implicit return and special mangling). This patch fixes a few stray declarations, including in libunwind and libc++abi.
69 lines
1.8 KiB
C++
69 lines
1.8 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// REQUIRES: linux && target={{aarch64-.+}}
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#include <libunwind.h>
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#include <stdlib.h>
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#include <string.h>
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// Basic test of VG (Vector Granule) unwinding. This is meant to mimic SVE/SME
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// unwind info without requiring those features for this test.
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#define VG_REGNUM 46
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__attribute__((noinline)) void baz() {
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// The previous value of VG is 2
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asm(".cfi_escape 0x16, 0x2e, 0x01, 0x32");
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unw_context_t context;
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unw_cursor_t cursor;
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unw_getcontext(&context);
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unw_init_local(&cursor, &context);
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// Note: At this point VG is not defined (until we unw_step).
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uint16_t expected_vgs[]{/*qux*/ 2, /*bar*/ 2, /*foo*/ 8, /*main*/ 2};
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for (uint16_t expected_vg : expected_vgs) {
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unw_step(&cursor);
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unw_word_t vg;
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unw_get_reg(&cursor, VG_REGNUM, &vg);
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if (vg != expected_vg)
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exit(1);
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}
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exit(0);
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}
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__attribute__((noinline)) void qux() { baz(); }
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__attribute__((noinline)) void bar() {
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// The previous value of VG is 8
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asm(".cfi_escape 0x16, 0x2e, 0x01, 0x38");
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// The previous value of W21 is VG (used to force an evaluation of VG).
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asm(".cfi_escape 0x16, 0x15, 0x03, 0x92, 0x2e, 0x00");
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// smstop sm
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qux();
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// smstart sm
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}
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__attribute__((noinline)) void foo() {
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// The previous value of VG is 2
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asm(".cfi_escape 0x16, 0x2e, 0x01, 0x32");
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// The previous value of W21 is VG (used to force an evaluation of VG).
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asm(".cfi_escape 0x16, 0x15, 0x03, 0x92, 0x2e, 0x00");
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// smstart sm
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bar();
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// smstop sm
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}
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int main(int, char **) {
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foo();
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return 0;
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}
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