Add support for separating strings for the split debug info DWARF5

proposal. This leaves the strings in the skeleton die as strp,
but in all dwo files they're accessed now via DW_FORM_GNU_str_index.

Add support for dumping these sections and modify the fission-cu.ll
testcase to have the correct strings and form. Fix a small bug
in the fixed form sizes routine that involved out of array accesses
for the table and add a FIXME in the extractFast routine to fix
this up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171779 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 1 deletions

diff --git a/lib/DebugInfo/DWARFContext.cpp b/lib/DebugInfo/DWARFContext.cpp
index 1270e6ec72..d6d9fcf3ea 100644
--- a/lib/DebugInfo/DWARFContext.cpp
+++ b/lib/DebugInfo/DWARFContext.cpp
@@ -152,7 +152,8 @@ void DWARFContext::parseCompileUnits() {
   while (DIData.isValidOffset(offset)) {
     CUs.push_back(DWARFCompileUnit(getDebugAbbrev(), getInfoSection(),
                                    getAbbrevSection(), getRangeSection(),
-                                   getStringSection(), &infoRelocMap(),
+                                   getStringSection(), "",
+                                   &infoRelocMap(),
                                    isLittleEndian()));
     if (!CUs.back().extract(DIData, &offset)) {
       CUs.pop_back();
@@ -172,6 +173,7 @@ void DWARFContext::parseDWOCompileUnits() {
                                       getAbbrevDWOSection(),
                                       getRangeDWOSection(),
                                       getStringDWOSection(),
+                                      getStringOffsetDWOSection(),
                                       &infoDWORelocMap(),
                                       isLittleEndian()));
     if (!DWOCUs.back().extract(DIData, &offset)) {
@@ -382,6 +384,8 @@ DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
       AbbrevDWOSection = data;
     else if (name == "debug_str.dwo")
       StringDWOSection = data;
+    else if (name == "debug_str_offsets.dwo")
+      StringOffsetDWOSection = data;
     // Any more debug info sections go here.
     else
       continue;