https://github.com/Michael137 updated https://github.com/llvm/llvm-project/pull/156050
>From 35999d8d509864795dd36565d12ddea425a98c22 Mon Sep 17 00:00:00 2001 From: Michael Buch <michaelbuc...@gmail.com> Date: Fri, 29 Aug 2025 16:57:35 +0100 Subject: [PATCH 1/2] [lldb][DataFormatter] Allow std::string formatters to match against custom allocators This came up in https://github.com/llvm/llvm-project/issues/155691. For `std::basic_string` our formatter matching logic required the allocator template parameter to be a `std::allocator`. There is no compelling reason (that I know of) why this would be required for us to apply the existing formatter to the string. We don't check the `allocator` parameter for other STL containers either. This meant that `std::string` that used custom allocators wouldn't be formatted. This patch relaxes the regex for `basic_string`. --- .../Language/CPlusPlus/CPlusPlusLanguage.cpp | 15 ++++------ .../string/TestDataFormatterStdString.py | 6 ++++ .../generic/string/main.cpp | 30 +++++++++++++++++++ 3 files changed, 41 insertions(+), 10 deletions(-) diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp index c39b529f7305a..ad3c00a1132d4 100644 --- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp +++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.cpp @@ -749,31 +749,27 @@ static void LoadLibCxxFormatters(lldb::TypeCategoryImplSP cpp_category_sp) { lldb_private::formatters::LibcxxStringSummaryProviderASCII, "std::string summary provider", "^std::__[[:alnum:]]+::basic_string<char, " - "std::__[[:alnum:]]+::char_traits<char>, " - "std::__[[:alnum:]]+::allocator<char> >$", + "std::__[[:alnum:]]+::char_traits<char>,.*>$", stl_summary_flags, true); AddCXXSummary(cpp_category_sp, lldb_private::formatters::LibcxxStringSummaryProviderASCII, "std::string summary provider", "^std::__[[:alnum:]]+::basic_string<unsigned char, " - "std::__[[:alnum:]]+::char_traits<unsigned char>, " - "std::__[[:alnum:]]+::allocator<unsigned char> >$", + "std::__[[:alnum:]]+::char_traits<unsigned char>,.*>$", stl_summary_flags, true); AddCXXSummary(cpp_category_sp, lldb_private::formatters::LibcxxStringSummaryProviderUTF16, "std::u16string summary provider", "^std::__[[:alnum:]]+::basic_string<char16_t, " - "std::__[[:alnum:]]+::char_traits<char16_t>, " - "std::__[[:alnum:]]+::allocator<char16_t> >$", + "std::__[[:alnum:]]+::char_traits<char16_t>,.*>$", stl_summary_flags, true); AddCXXSummary(cpp_category_sp, lldb_private::formatters::LibcxxStringSummaryProviderUTF32, "std::u32string summary provider", "^std::__[[:alnum:]]+::basic_string<char32_t, " - "std::__[[:alnum:]]+::char_traits<char32_t>, " - "std::__[[:alnum:]]+::allocator<char32_t> >$", + "std::__[[:alnum:]]+::char_traits<char32_t>,.*>$", stl_summary_flags, true); AddCXXSummary(cpp_category_sp, @@ -784,8 +780,7 @@ static void LoadLibCxxFormatters(lldb::TypeCategoryImplSP cpp_category_sp) { lldb_private::formatters::LibcxxWStringSummaryProvider, "std::wstring summary provider", "^std::__[[:alnum:]]+::basic_string<wchar_t, " - "std::__[[:alnum:]]+::char_traits<wchar_t>, " - "std::__[[:alnum:]]+::allocator<wchar_t> >$", + "std::__[[:alnum:]]+::char_traits<wchar_t>,.*>$", stl_summary_flags, true); AddCXXSummary(cpp_category_sp, diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py index fec20bae997ef..6a27b5d2f0780 100644 --- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py +++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/TestDataFormatterStdString.py @@ -80,6 +80,8 @@ def cleanup(): '(%s::string) Q = "quite a long std::strin with lots of info inside it"' % ns, "(%s::string *) null_str = nullptr" % ns, + '(CustomString) custom_str = "hello!"', + '(CustomWString) custom_wstr = L"hello!"', ], ) @@ -143,6 +145,10 @@ def do_test_multibyte(self): '(%s::u16string) u16_empty = u""' % ns, '(%s::u32string) u32_string = U"🍄🍅🍆🍌"' % ns, '(%s::u32string) u32_empty = U""' % ns, + '(CustomStringU16) custom_u16 = u"ß水氶"', + '(CustomStringU16) custom_u16_empty = u""', + '(CustomStringU32) custom_u32 = U"🍄🍅🍆🍌"', + '(CustomStringU32) custom_u32_empty = U""', ], ) diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp index f22c890861d01..55f2de131b402 100644 --- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp +++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp @@ -1,6 +1,29 @@ #include <stdint.h> #include <string> +template <typename T> struct CustomAlloc { + using value_type = T; + using pointer = value_type *; + using const_pointer = const value_type *; + using size_type = std::size_t; + + pointer allocate(size_type) { return new T; } + + void deallocate(pointer p, size_type) { delete p; } +}; + +using CustomString = + std::basic_string<char, std::char_traits<char>, CustomAlloc<char>>; + +using CustomWString = + std::basic_string<wchar_t, std::char_traits<wchar_t>, CustomAlloc<wchar_t>>; + +using CustomStringU16 = std::basic_string<char16_t, std::char_traits<char16_t>, + CustomAlloc<char16_t>>; + +using CustomStringU32 = std::basic_string<char32_t, std::char_traits<char32_t>, + CustomAlloc<char32_t>>; + size_t touch_string(std::string &in_str) { return in_str.size(); // Break here to look at bad string } @@ -99,6 +122,13 @@ int main() { std::string *pq = &q; std::string *pQ = &Q; + CustomString custom_str("hello!"); + CustomWString custom_wstr(L"hello!"); + CustomStringU16 custom_u16(u16_string); + CustomStringU16 custom_u16_empty(u""); + CustomStringU32 custom_u32(u32_string); + CustomStringU32 custom_u32_empty(U""); + S.assign(L"!!!!!"); // Set break point at this line. std::string *not_a_string = (std::string *)0x0; touch_string(*not_a_string); >From af0f77f235d3544add4f494365fa0075e63fe5a2 Mon Sep 17 00:00:00 2001 From: Michael Buch <michaelbuc...@gmail.com> Date: Mon, 1 Sep 2025 11:06:28 +0100 Subject: [PATCH 2/2] fixup! fix test compilation with libstdc++ --- .../data-formatter/data-formatter-stl/generic/string/main.cpp | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp index 55f2de131b402..720601261056d 100644 --- a/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp +++ b/lldb/test/API/functionalities/data-formatter/data-formatter-stl/generic/string/main.cpp @@ -124,9 +124,9 @@ int main() { CustomString custom_str("hello!"); CustomWString custom_wstr(L"hello!"); - CustomStringU16 custom_u16(u16_string); + CustomStringU16 custom_u16(u16_string.c_str()); CustomStringU16 custom_u16_empty(u""); - CustomStringU32 custom_u32(u32_string); + CustomStringU32 custom_u32(u32_string.c_str()); CustomStringU32 custom_u32_empty(U""); S.assign(L"!!!!!"); // Set break point at this line. _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
