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Kernel: Demangle kernel C++ symbols correctly again

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I broke this while implementing module linking. Also move the actual
demangling work to AK, in AK::demangle(const char*)
This commit is contained in:
Andreas Kling 2019-11-29 14:55:07 +01:00
parent 422e5166f2
commit f75a6b9daa
Notes: sideshowbarker 2024-07-19 11:02:07 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/f75a6b9daa7
4 changed files with 27 additions and 14 deletions
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21
AK/Demangle.h Normal file
View file

@ -0,0 +1,21 @@
#pragma once
#include <AK/String.h>
#include <cxxabi.h>
namespace AK {
inline String demangle(const char* name)
{
int status = 0;
auto* demangled_name = abi::__cxa_demangle(name, nullptr, nullptr, &status);
auto string = String(status == 0 ? demangled_name : name);
if (status == 0)
kfree(demangled_name);
return string;
}
}
using AK::demangle;

8
Kernel/KSyms.cpp
View file

@ -1,3 +1,4 @@
#include <AK/Demangle.h>
#include <AK/TemporaryChange.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/KSyms.h>
@ -115,11 +116,6 @@ static void load_ksyms_from_data(const ByteBuffer& buffer)
return;
}
ASSERT(recognized_symbol_count <= max_recognized_symbol_count);
size_t bytes_needed = 0;
for (int i = 0; i < recognized_symbol_count; ++i) {
auto& symbol = recognized_symbols[i];
bytes_needed += (symbol.ksym ? strlen(symbol.ksym->name) : 0) + 8 + 16;
}
for (int i = 0; i < recognized_symbol_count; ++i) {
auto& symbol = recognized_symbols[i];
if (!symbol.address)
@ -136,7 +132,7 @@ static void load_ksyms_from_data(const ByteBuffer& buffer)
if (symbol.ksym->address == ksym_highest_address && offset > 4096)
dbgprintf("%p\n", symbol.address);
else
dbgprintf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
dbgprintf("%p %s +%u\n", symbol.address, demangle(symbol.ksym->name).characters(), offset);
}
}

3
Kernel/Thread.cpp
View file

@ -1,3 +1,4 @@
#include <AK/Demangle.h>
#include <AK/StringBuilder.h>
#include <Kernel/FileSystem/FileDescription.h>
#include <Kernel/Process.h>
@ -682,7 +683,7 @@ String Thread::backtrace_impl() const
if (symbol.ksym->address == ksym_highest_address && offset > 4096)
builder.appendf("%p\n", symbol.address);
else
builder.appendf("%p %s +%u\n", symbol.address, symbol.ksym->name, offset);
builder.appendf("%p %s +%u\n", symbol.address, demangle(symbol.ksym->name).characters(), offset);
}
return builder.to_string();
}

9
Libraries/LibELF/ELFLoader.cpp
View file

@ -1,7 +1,7 @@
#include "ELFLoader.h"
#include <AK/Demangle.h>
#include <AK/QuickSort.h>
#include <AK/kstdio.h>
#include <cxxabi.h>
#ifdef KERNEL
#include <Kernel/VM/MemoryManager.h>
@ -139,12 +139,7 @@ String ELFLoader::symbolicate(u32 address) const
if (i == 0)
return "!!";
auto& symbol = sorted_symbols[i - 1];
int status = 0;
auto* demangled_name = abi::__cxa_demangle(symbol.name, nullptr, nullptr, &status);
auto string = String::format("%s +%u", status == 0 ? demangled_name : symbol.name, address - symbol.address);
if (status == 0)
kfree(demangled_name);
return string;
return String::format("%s +%u", demangle(symbol.name).characters(), address - symbol.address);
}
}
return "??";