126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/Demangle.h>
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#include <algorithm>
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#include <cstring>
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#include <folly/detail/Demangle.h>
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#include <folly/lang/CString.h>
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#include <folly/portability/Config.h>
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#if FOLLY_DETAIL_HAVE_DEMANGLE_H
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#include <cxxabi.h>
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#endif
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namespace folly {
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#if FOLLY_DETAIL_HAVE_DEMANGLE_H
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fbstring demangle(const char* name) {
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if (!name) {
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return fbstring();
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}
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#ifdef FOLLY_DEMANGLE_MAX_SYMBOL_SIZE
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// GCC's __cxa_demangle() uses on-stack data structures for the
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// parser state which are linear in the number of components of the
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// symbol. For extremely long symbols, this can cause a stack
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// overflow. We set an arbitrary symbol length limit above which we
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// just return the mangled name.
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size_t mangledLen = strlen(name);
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if (mangledLen > FOLLY_DEMANGLE_MAX_SYMBOL_SIZE) {
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return fbstring(name, mangledLen);
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}
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#endif
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int status;
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size_t len = 0;
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// malloc() memory for the demangled type name
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char* demangled = abi::__cxa_demangle(name, nullptr, &len, &status);
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if (status != 0) {
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return name;
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}
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// len is the length of the buffer (including NUL terminator and maybe
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// other junk)
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return fbstring(demangled, strlen(demangled), len, AcquireMallocatedString());
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}
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namespace {
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struct DemangleBuf {
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char* dest;
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size_t remaining;
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size_t total;
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};
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void demangleCallback(const char* str, size_t size, void* p) {
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DemangleBuf* buf = static_cast<DemangleBuf*>(p);
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size_t n = std::min(buf->remaining, size);
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memcpy(buf->dest, str, n);
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buf->dest += n;
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buf->remaining -= n;
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buf->total += size;
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}
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} // namespace
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size_t demangle(const char* name, char* out, size_t outSize) {
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#ifdef FOLLY_DEMANGLE_MAX_SYMBOL_SIZE
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size_t mangledLen = strlen(name);
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if (mangledLen > FOLLY_DEMANGLE_MAX_SYMBOL_SIZE) {
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if (outSize) {
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size_t n = std::min(mangledLen, outSize - 1);
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memcpy(out, name, n);
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out[n] = '\0';
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}
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return mangledLen;
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}
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#endif
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DemangleBuf dbuf;
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dbuf.dest = out;
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dbuf.remaining = outSize ? outSize - 1 : 0; // leave room for null term
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dbuf.total = 0;
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// Unlike most library functions, this returns 1 on success and 0 on failure
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int status =
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detail::cplus_demangle_v3_callback_wrapper(name, demangleCallback, &dbuf);
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if (status == 0) { // failed, return original
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return folly::strlcpy(out, name, outSize);
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}
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if (outSize != 0) {
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*dbuf.dest = '\0';
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}
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return dbuf.total;
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}
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#else
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fbstring demangle(const char* name) {
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return name;
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}
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size_t demangle(const char* name, char* out, size_t outSize) {
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return folly::strlcpy(out, name, outSize);
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}
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#endif
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} // namespace folly
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