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Normalization of stdlib inline namespace names (#3119)

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* Normalization of stdlib inline namespace names

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

* Remove all subnamespaces with names matching "__*" mask

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>

Signed-off-by: Vladislav Shchapov <vladislav@shchapov.ru>
This commit is contained in:
Vladislav Shchapov 2022-09-29 21:52:38 +05:00 committed by GitHub
parent 0ccaed3a6c
commit ad91cab374
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 52 additions and 5 deletions
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38
include/fmt/std.h
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@ -214,10 +214,40 @@ struct formatter<
std::size_t size = 0;
std::unique_ptr<char, decltype(&std::free)> demangled_name_ptr(
abi::__cxa_demangle(ti.name(), nullptr, &size, &status), &std::free);
out = detail::write_bytes(
out,
string_view(demangled_name_ptr ? demangled_name_ptr.get() : ti.name()),
spec);
string_view demangled_name_view;
if (demangled_name_ptr) {
demangled_name_view = demangled_name_ptr.get();
// Normalization of stdlib inline namespace names.
// libc++ inline namespaces.
// std::__1::* -> std::*
// std::__1::__fs::* -> std::*
// libstdc++ inline namespaces.
// std::__cxx11::* -> std::*
// std::filesystem::__cxx11::* -> std::filesystem::*
if (demangled_name_view.starts_with("std::")) {
char* begin = demangled_name_ptr.get();
char* to = begin + 5; // std::
for (char *from = to, *end = begin + demangled_name_view.size();
from < end;) {
// This is safe, because demangled_name is NUL-terminated.
if (from[0] == '_' && from[1] == '_') {
char* next = from + 1;
while (next < end && *next != ':') next++;
if (next[0] == ':' && next[1] == ':') {
from = next + 2;
continue;
}
}
*to++ = *from++;
}
demangled_name_view = {begin, detail::to_unsigned(to - begin)};
}
} else {
demangled_name_view = string_view(ti.name());
}
out = detail::write_bytes(out, demangled_name_view, spec);
#elif FMT_MSC_VERSION
string_view demangled_name_view(ti.name());
if (demangled_name_view.starts_with("class "))

19
test/std-test.cc
View File

@ -11,7 +11,9 @@
#include <vector>
#include "fmt/ranges.h"
#include "gtest/gtest.h"
#include "gtest-extra.h" // StartsWith
using testing::StartsWith;
TEST(std_test, path) {
#ifdef __cpp_lib_filesystem
@ -116,4 +118,19 @@ TEST(std_test, exception) {
fmt::format("{:t}", ex));
EXPECT_EQ("My Exception", fmt::format("{:}", ex));
}
try {
throw std::system_error(std::error_code(), "message");
} catch (const std::system_error& ex) {
EXPECT_THAT(fmt::format("{:t}", ex), StartsWith("std::system_error: "));
}
#ifdef __cpp_lib_filesystem
try {
throw std::filesystem::filesystem_error("message", std::error_code());
} catch (const std::filesystem::filesystem_error& ex) {
EXPECT_THAT(fmt::format("{:t}", ex),
StartsWith("std::filesystem::filesystem_error: "));
}
#endif
}