[Lldb-commits] [lldb] Add more ways to find the .dwp file. (PR #81067)
Greg Clayton via lldb-commits
lldb-commits at lists.llvm.org
Wed Feb 7 16:54:02 PST 2024
https://github.com/clayborg created https://github.com/llvm/llvm-project/pull/81067
When using split DWARF we can run into many different ways to store debug info:
- lldb loads "<exe>" which contains skeleton DWARF and needs to find "<exe>.dwp"
- lldb loads "<exe>" which is stripped but has .gnu_debuglink pointing to "<exe>.debug" with skeleton DWARF and needs to find "<exe>.dwp"
- lldb loads "<exe>" which is stripped but has .gnu_debuglink pointing to "<exe>.debug" with skeleton DWARF and needs to find "<exe>.debug.dwp"
- lldb loads "<exe>.debug" and needs to find "<exe>.dwp
Previously we only handled the first two cases. This patch adds support for the latter two.
>From 3c2f6039cf0e253d78b5193098b311028daaea72 Mon Sep 17 00:00:00 2001
From: Greg Clayton <clayborg at gmail.com>
Date: Wed, 7 Feb 2024 16:43:50 -0800
Subject: [PATCH] Add more ways to find the .dwp file.
When using split DWARF we can run into many different ways to store debug info:
- lldb loads "<exe>" which contains skeleton DWARF and needs to find "<exe>.dwp"
- lldb loads "<exe>" which is stripped but has .gnu_debuglink pointing to "<exe>.debug" with skeleton DWARF and needs to find "<exe>.dwp"
- lldb loads "<exe>" which is stripped but has .gnu_debuglink pointing to "<exe>.debug" with skeleton DWARF and needs to find "<exe>.debug.dwp"
- lldb loads "<exe>.debug" and needs to find "<exe>.dwp
Previously we only handled the first two cases. This patch adds support for the latter two.
---
lldb/include/lldb/Utility/FileSpecList.h | 4 ++
.../SymbolFile/DWARF/SymbolFileDWARF.cpp | 61 +++++++++++++------
.../DWARF/x86/dwp-separate-debug-file.cpp | 30 +++++++++
3 files changed, 78 insertions(+), 17 deletions(-)
diff --git a/lldb/include/lldb/Utility/FileSpecList.h b/lldb/include/lldb/Utility/FileSpecList.h
index 49edc667ddd5b6..6eb3bb9971f13a 100644
--- a/lldb/include/lldb/Utility/FileSpecList.h
+++ b/lldb/include/lldb/Utility/FileSpecList.h
@@ -238,6 +238,10 @@ class FileSpecList {
const_iterator begin() const { return m_files.begin(); }
const_iterator end() const { return m_files.end(); }
+ llvm::iterator_range<const_iterator> files() const {
+ return llvm::make_range(begin(), end());
+ }
+
protected:
collection m_files; ///< A collection of FileSpec objects.
};
diff --git a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
index 781f5c5a436778..487961fa7437fb 100644
--- a/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
+++ b/lldb/source/Plugins/SymbolFile/DWARF/SymbolFileDWARF.cpp
@@ -4349,26 +4349,53 @@ SymbolFileDWARFDebugMap *SymbolFileDWARF::GetDebugMapSymfile() {
const std::shared_ptr<SymbolFileDWARFDwo> &SymbolFileDWARF::GetDwpSymbolFile() {
llvm::call_once(m_dwp_symfile_once_flag, [this]() {
+ // Create a list of files to try and append .dwp to
+ FileSpecList symfiles;
+ // Append the module's object file path.
+ const FileSpec module_fspec = m_objfile_sp->GetModule()->GetFileSpec();
+ symfiles.Append(module_fspec);
+ // Append the object file for this SymbolFile only if it is different from
+ // the module's file path. Our main module could be "a.out", our symbol file
+ // could be "a.debug" and our ".dwp" file might be "a.debug.dwp" instead of
+ // "a.out.dwp".
+ const FileSpec symfile_fspec(m_objfile_sp->GetFileSpec());
+ if (symfile_fspec != module_fspec) {
+ symfiles.Append(symfile_fspec);
+ } else {
+ // If we don't have a separate debug info file, then try stripping the
+ // extension. We main module could be "a.debug" and the .dwp file could be
+ // "a.dwp" instead of "a.debug.dwp".
+ ConstString filename_no_ext =
+ module_fspec.GetFileNameStrippingExtension();
+ if (filename_no_ext != module_fspec.GetFilename()) {
+ FileSpec module_spec_no_ext(module_fspec);
+ module_spec_no_ext.SetFilename(filename_no_ext);
+ symfiles.Append(module_spec_no_ext);
+ }
+ }
+
+ FileSpecList search_paths = Target::GetDefaultDebugFileSearchPaths();
ModuleSpec module_spec;
module_spec.GetFileSpec() = m_objfile_sp->GetFileSpec();
- module_spec.GetSymbolFileSpec() =
- FileSpec(m_objfile_sp->GetModule()->GetFileSpec().GetPath() + ".dwp");
-
module_spec.GetUUID() = m_objfile_sp->GetUUID();
- FileSpecList search_paths = Target::GetDefaultDebugFileSearchPaths();
- FileSpec dwp_filespec =
- PluginManager::LocateExecutableSymbolFile(module_spec, search_paths);
- if (FileSystem::Instance().Exists(dwp_filespec)) {
- DataBufferSP dwp_file_data_sp;
- lldb::offset_t dwp_file_data_offset = 0;
- ObjectFileSP dwp_obj_file = ObjectFile::FindPlugin(
- GetObjectFile()->GetModule(), &dwp_filespec, 0,
- FileSystem::Instance().GetByteSize(dwp_filespec), dwp_file_data_sp,
- dwp_file_data_offset);
- if (!dwp_obj_file)
- return;
- m_dwp_symfile = std::make_shared<SymbolFileDWARFDwo>(
- *this, dwp_obj_file, DIERef::k_file_index_mask);
+ for (const auto &symfile : symfiles.files()) {
+ module_spec.GetSymbolFileSpec() =
+ FileSpec(symfile.GetPath() + ".dwp", symfile.GetPathStyle());
+ FileSpec dwp_filespec =
+ PluginManager::LocateExecutableSymbolFile(module_spec, search_paths);
+ if (FileSystem::Instance().Exists(dwp_filespec)) {
+ DataBufferSP dwp_file_data_sp;
+ lldb::offset_t dwp_file_data_offset = 0;
+ ObjectFileSP dwp_obj_file = ObjectFile::FindPlugin(
+ GetObjectFile()->GetModule(), &dwp_filespec, 0,
+ FileSystem::Instance().GetByteSize(dwp_filespec), dwp_file_data_sp,
+ dwp_file_data_offset);
+ if (!dwp_obj_file)
+ return;
+ m_dwp_symfile = std::make_shared<SymbolFileDWARFDwo>(
+ *this, dwp_obj_file, DIERef::k_file_index_mask);
+ break;
+ }
}
});
return m_dwp_symfile;
diff --git a/lldb/test/Shell/SymbolFile/DWARF/x86/dwp-separate-debug-file.cpp b/lldb/test/Shell/SymbolFile/DWARF/x86/dwp-separate-debug-file.cpp
index a47209931c3840..408bdcb3fbd99c 100644
--- a/lldb/test/Shell/SymbolFile/DWARF/x86/dwp-separate-debug-file.cpp
+++ b/lldb/test/Shell/SymbolFile/DWARF/x86/dwp-separate-debug-file.cpp
@@ -1,5 +1,6 @@
// REQUIRES: lld
+// Now test with DWARF5
// RUN: %clang -target x86_64-pc-linux -gsplit-dwarf -gdwarf-5 -c %s -o %t.dwarf5.o
// RUN: ld.lld %t.dwarf5.o -o %t.dwarf5
// RUN: llvm-dwp %t.dwarf5.dwo -o %t.dwarf5.dwp
@@ -34,6 +35,19 @@
// RUN: -o "statistics dump" \
// RUN: %t.dwarf5 -b | FileCheck %s -check-prefix=CACHED
+// Make sure that if we load the "%t.dwarf5.debug" file, that we can find and
+// load the .dwo file from the .dwp when it is "%t.dwarf5.dwp"
+// RUN: %lldb %t.dwarf5.debug -o "b main" -b | FileCheck %s -check-prefix=DEBUG
+
+// Make sure that if we load the "%t.dwarf5" file, that we can find and
+// load the .dwo file from the .dwp when it is "%t.dwarf5.debug.dwp"
+// RUN: mv %t.dwarf5.dwp %t.dwarf5.debug.dwp
+// RUN: %lldb %t.dwarf5.debug -o "b main" -b | FileCheck %s -check-prefix=DEBUG
+
+// Make sure that if we load the "%t.dwarf5.debug" file, that we can find and
+// load the .dwo file from the .dwp when it is "%t.dwarf5.debug.dwp"
+// RUN: %lldb %t.dwarf5.debug -o "b main" -b | FileCheck %s -check-prefix=DEBUG
+
// Now test with DWARF4
// RUN: %clang -target x86_64-pc-linux -gsplit-dwarf -gdwarf-4 -c %s -o %t.dwarf4.o
// RUN: ld.lld %t.dwarf4.o -o %t.dwarf4
@@ -69,6 +83,19 @@
// RUN: -o "statistics dump" \
// RUN: %t.dwarf4 -b | FileCheck %s -check-prefix=CACHED
+// Make sure that if we load the "%t.dwarf4.debug" file, that we can find and
+// load the .dwo file from the .dwp when it is "%t.dwarf4.dwp"
+// RUN: %lldb %t.dwarf4.debug -o "b main" -b | FileCheck %s -check-prefix=DEBUG
+
+// Make sure that if we load the "%t.dwarf4" file, that we can find and
+// load the .dwo file from the .dwp when it is "%t.dwarf4.debug.dwp"
+// RUN: mv %t.dwarf4.dwp %t.dwarf4.debug.dwp
+// RUN: %lldb %t.dwarf4.debug -o "b main" -b | FileCheck %s -check-prefix=DEBUG
+
+// Make sure that if we load the "%t.dwarf4.debug" file, that we can find and
+// load the .dwo file from the .dwp when it is "%t.dwarf4.debug.dwp"
+// RUN: %lldb %t.dwarf4.debug -o "b main" -b | FileCheck %s -check-prefix=DEBUG
+
// CHECK: (A) a = (x = 47)
// CACHE: script lldb.target.modules[0].FindTypes('::A').GetTypeAtIndex(0)
@@ -83,6 +110,9 @@
// CACHED-NEXT: }
// CACHED: "totalDebugInfoIndexLoadedFromCache": 1
+// Make sure debug information was loaded by verifying that the
+// DEBUG: Breakpoint 1: where = dwp-separate-debug-file.cpp.tmp.dwarf{{[45]}}.debug`main + {{[0-9]+}} at dwp-separate-debug-file.cpp:{{[0-9]+}}:{{[0-9]+}}, address = {{0x[0-9a-fA-F]+}}
+
struct A {
int x = 47;
};
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