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LibSymbolication: Look for libraries under /usr/local/lib

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While trying to investigate a problem with the ssl module in the python
port I found that the SystemMonitor Stack tab for a process wouldn't
show the symbols for the libssl and libcrypto shared libraries that are
installed under /usr/local/lib. The main reason for this is that
LibSymbolication didn't look for libraries under /usr/local/lib.

This commit adds support for looking for libraries under /usr/local/lib.
Absolute paths are still respected, and lookup gives precedence to
/usr/lib, just like dynamic linker does.
This commit is contained in:
Rodrigo Tobar 2021-09-27 23:54:53 +08:00 • committed by Andreas Kling
parent f4ebcf4867
commit 12e18e44ae
1 changed files with 27 additions and 10 deletions
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37
Userland/Libraries/LibSymbolication/Symbolication.cpp
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@ -4,10 +4,12 @@
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Array.h>
#include <AK/Checked.h>
#include <AK/JsonArray.h>
#include <AK/JsonObject.h>
#include <AK/JsonValue.h>
#include <AK/LexicalPath.h>
#include <AK/MappedFile.h>
#include <LibCore/File.h>
#include <LibDebug/DebugInfo.h>
@ -61,24 +63,41 @@ Optional<FlatPtr> kernel_base()
Optional<Symbol> symbolicate(String const& path, FlatPtr address)
{
if (!s_cache.contains(path)) {
auto mapped_file = MappedFile::map(path);
if (mapped_file.is_error()) {
dbgln("Failed to map {}: {}", path, mapped_file.error().string());
String full_path = path;
if (!path.starts_with('/')) {
Array<StringView, 2> search_paths { "/usr/lib"sv, "/usr/local/lib"sv };
bool found = false;
for (auto& search_path : search_paths) {
full_path = LexicalPath::join(search_path, path).string();
if (Core::File::exists(full_path)) {
found = true;
break;
}
}
if (!found) {
dbgln("Failed to find candidate for {}", path);
s_cache.set(path, {});
return {};
}
}
if (!s_cache.contains(full_path)) {
auto mapped_file = MappedFile::map(full_path);
if (mapped_file.is_error()) {
dbgln("Failed to map {}: {}", full_path, mapped_file.error().string());
s_cache.set(full_path, {});
return {};
}
auto elf = make<ELF::Image>(mapped_file.value()->bytes());
if (!elf->is_valid()) {
dbgln("ELF not valid: {}", path);
s_cache.set(path, {});
dbgln("ELF not valid: {}", full_path);
s_cache.set(full_path, {});
return {};
}
auto cached_elf = make<CachedELF>(mapped_file.release_value(), make<Debug::DebugInfo>(*elf), move(elf));
s_cache.set(path, move(cached_elf));
s_cache.set(full_path, move(cached_elf));
}
auto it = s_cache.find(path);
auto it = s_cache.find(full_path);
VERIFY(it != s_cache.end());
auto& cached_elf = it->value;
@ -172,8 +191,6 @@ Vector<Symbol> symbolicate_thread(pid_t pid, pid_t tid)
} else if (name.ends_with(": .text") || name.ends_with(": .rodata")) {
auto parts = name.split_view(':');
path = parts[0];
if (!path.starts_with('/'))
path = String::formatted("/usr/lib/{}", path);
} else {
continue;
}