Sketch out a DWARF parser.
This introduces a new library to LLVM: libDebugInfo. It will provide debug information
parsing to LLVM. Much of the design and some of the code is taken from the LLDB project.
It also contains an llvm-dwarfdump tool that can dump the abbrevs and DIEs from an
object file. It can be used to write tests for DWARF input and output easily.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139627 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/DebugInfo/DWARFContext.cpp b/lib/DebugInfo/DWARFContext.cpp
new file mode 100644
index 0000000..513e415
--- /dev/null
+++ b/lib/DebugInfo/DWARFContext.cpp
@@ -0,0 +1,43 @@
+//===-- DWARFContext.cpp --------------------------------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "DWARFContext.h"
+using namespace llvm;
+
+void DWARFContext::dump(raw_ostream &OS) {
+ getDebugAbbrev()->dump(OS);
+ for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i)
+ getCompileUnitAtIndex(i)->dump(OS);
+}
+
+const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
+ if (Abbrev)
+ return Abbrev.get();
+
+ DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
+
+ Abbrev.reset(new DWARFDebugAbbrev());
+ Abbrev->parse(abbrData);
+ return Abbrev.get();
+}
+
+void DWARFContext::parseCompileUnits() {
+ uint32_t offset = 0;
+ const DataExtractor &debug_info_data = DataExtractor(getInfoSection(),
+ isLittleEndian(), 0);
+ while (debug_info_data.isValidOffset(offset)) {
+ CUs.push_back(DWARFCompileUnit(*this));
+ if (!CUs.back().extract(debug_info_data, &offset)) {
+ CUs.pop_back();
+ break;
+ }
+
+ offset = CUs.back().getNextCompileUnitOffset();
+ }
+}