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[libc] Add rule named
add_libc_hermetic_test which adds a hermetic …
…test. A convenience wrapper name `add_libc_test` is also added which adds both a unit test and a hermetic test. The ctype tests have been switched over to use add_libc_test. Reviewed By: jhuber6 Differential Revision: https://reviews.llvm.org/D148756
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Siva Chandra Reddy
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Apr 24, 2023
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| @@ -0,0 +1,91 @@ | ||
| //===-- Implementation of libc death test executors -----------------------===// | ||
| // | ||
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. | ||
| // See https://llvm.org/LICENSE.txt for license information. | ||
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception | ||
| // | ||
| //===----------------------------------------------------------------------===// | ||
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| #include <stddef.h> | ||
| #include <stdint.h> | ||
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| namespace __llvm_libc { | ||
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| int bcmp(const void *lhs, const void *rhs, size_t count); | ||
| void bzero(void *ptr, size_t count); | ||
| int memcmp(const void *lhs, const void *rhs, size_t count); | ||
| void *memcpy(void *__restrict, const void *__restrict, size_t); | ||
| void *memmove(void *dst, const void *src, size_t count); | ||
| void *memset(void *ptr, int value, size_t count); | ||
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| } // namespace __llvm_libc | ||
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| namespace { | ||
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| // Integration tests cannot use the SCUDO standalone allocator as SCUDO pulls | ||
| // various other parts of the libc. Since SCUDO development does not use | ||
| // LLVM libc build rules, it is very hard to keep track or pull all that SCUDO | ||
| // requires. Hence, as a work around for this problem, we use a simple allocator | ||
| // which just hands out continuous blocks from a statically allocated chunk of | ||
| // memory. | ||
| static uint8_t memory[16384]; | ||
| static uint8_t *ptr = memory; | ||
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| } // anonymous namespace | ||
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| extern "C" { | ||
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| // Hermetic tests rely on the following memory functions. This is because the | ||
| // compiler code generation can emit calls to them. We want to map the external | ||
| // entrypoint to the internal implementation of the function used for testing. | ||
| // This is done manually as not all targets support aliases. | ||
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| int bcmp(const void *lhs, const void *rhs, size_t count) { | ||
| return __llvm_libc::bcmp(lhs, rhs, count); | ||
| } | ||
| void bzero(void *ptr, size_t count) { __llvm_libc::bzero(ptr, count); } | ||
| int memcmp(const void *lhs, const void *rhs, size_t count) { | ||
| return __llvm_libc::memcmp(lhs, rhs, count); | ||
| } | ||
| void *memcpy(void *__restrict dst, const void *__restrict src, size_t count) { | ||
| return __llvm_libc::memcpy(dst, src, count); | ||
| } | ||
| void *memmove(void *dst, const void *src, size_t count) { | ||
| return __llvm_libc::memmove(dst, src, count); | ||
| } | ||
| void *memset(void *ptr, int value, size_t count) { | ||
| return __llvm_libc::memset(ptr, value, count); | ||
| } | ||
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| void *malloc(size_t s) { | ||
| void *mem = ptr; | ||
| ptr += s; | ||
| return mem; | ||
| } | ||
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| void free(void *) {} | ||
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| void *realloc(void *ptr, size_t s) { | ||
| free(ptr); | ||
| return malloc(s); | ||
| } | ||
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| // The unit test framework uses pure virtual functions. Since hermetic tests | ||
| // cannot depend C++ runtime libraries, implement dummy functions to support | ||
| // the virtual function runtime. | ||
| void __cxa_pure_virtual() { | ||
| // A pure virtual being called is an error so we just trap. | ||
| __builtin_trap(); | ||
| } | ||
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| // Integration tests are linked with -nostdlib. BFD linker expects | ||
| // __dso_handle when -nostdlib is used. | ||
| void *__dso_handle = nullptr; | ||
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| } // extern "C" | ||
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| void operator delete(void *) { | ||
| // The libc runtime should not use the global delete operator. Hence, | ||
| // we just trap here to catch any such accidental usages. | ||
| __builtin_trap(); | ||
| } |
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