[ObjectYAML] Support for DWARF line tables

One more try... relanding r291541 with a fix to properly gate MaxOpsPerInst on DWARF version.

Description from r291541:

This patch re-lands r291470, which failed on Linux bots. The issue (I believe) was undefined behavior because the size of llvm::dwarf::LineNumberOps was not explcitly specified or consistently respected. The updated patch adds an explcit underlying type to the enum and preserves the size more correctly.

Original description:

This patch adds support for the DWARF debug_lines section. The line table state machine opcodes are preserved, so this can be used to test the state machine evaluation directly.

llvm-svn: 291546

1 files changed, 57 insertions, 10 deletions

diff --git a/llvm/lib/ObjectYAML/DWARFYAML.cpp b/llvm/lib/ObjectYAML/DWARFYAML.cpp
index 42a448a7bdf..014e63fe7d3 100644
--- a/llvm/lib/ObjectYAML/DWARFYAML.cpp
+++ b/llvm/lib/ObjectYAML/DWARFYAML.cpp
@@ -27,17 +27,18 @@ void MappingTraits<DWARFYAML::Data>::mapping(IO &IO, DWARFYAML::Data &DWARF) {
   IO.setContext(&DWARF);
   IO.mapOptional("debug_str", DWARF.DebugStrings);
   IO.mapOptional("debug_abbrev", DWARF.AbbrevDecls);
-  if(!DWARF.ARanges.empty() || !IO.outputting())
+  if (!DWARF.ARanges.empty() || !IO.outputting())
     IO.mapOptional("debug_aranges", DWARF.ARanges);
-  if(!DWARF.PubNames.Entries.empty() || !IO.outputting())
+  if (!DWARF.PubNames.Entries.empty() || !IO.outputting())
     IO.mapOptional("debug_pubnames", DWARF.PubNames);
-  if(!DWARF.PubTypes.Entries.empty() || !IO.outputting())
+  if (!DWARF.PubTypes.Entries.empty() || !IO.outputting())
     IO.mapOptional("debug_pubtypes", DWARF.PubTypes);
-  if(!DWARF.GNUPubNames.Entries.empty() || !IO.outputting())
+  if (!DWARF.GNUPubNames.Entries.empty() || !IO.outputting())
     IO.mapOptional("debug_gnu_pubnames", DWARF.GNUPubNames);
-  if(!DWARF.GNUPubTypes.Entries.empty() || !IO.outputting())
+  if (!DWARF.GNUPubTypes.Entries.empty() || !IO.outputting())
     IO.mapOptional("debug_gnu_pubtypes", DWARF.GNUPubTypes);
   IO.mapOptional("debug_info", DWARF.CompileUnits);
+  IO.mapOptional("debug_line", DWARF.DebugLines);
   IO.setContext(&oldContext);
 }
 
@@ -62,7 +63,7 @@ void MappingTraits<DWARFYAML::ARangeDescriptor>::mapping(
 }
 
 void MappingTraits<DWARFYAML::ARange>::mapping(IO &IO,
-                                                DWARFYAML::ARange &Range) {
+                                               DWARFYAML::ARange &Range) {
   IO.mapRequired("Length", Range.Length);
   IO.mapRequired("Version", Range.Version);
   IO.mapRequired("CuOffset", Range.CuOffset);
@@ -106,15 +107,61 @@ void MappingTraits<DWARFYAML::Entry>::mapping(IO &IO, DWARFYAML::Entry &Entry) {
   IO.mapRequired("Values", Entry.Values);
 }
 
-void MappingTraits<DWARFYAML::FormValue>::mapping(IO &IO,
-                                             DWARFYAML::FormValue &FormValue) {
+void MappingTraits<DWARFYAML::FormValue>::mapping(
+    IO &IO, DWARFYAML::FormValue &FormValue) {
   IO.mapOptional("Value", FormValue.Value);
-  if(!FormValue.CStr.empty() || !IO.outputting())
+  if (!FormValue.CStr.empty() || !IO.outputting())
     IO.mapOptional("CStr", FormValue.CStr);
-  if(!FormValue.BlockData.empty() || !IO.outputting())
+  if (!FormValue.BlockData.empty() || !IO.outputting())
     IO.mapOptional("BlockData", FormValue.BlockData);
 }
 
+void MappingTraits<DWARFYAML::File>::mapping(IO &IO, DWARFYAML::File &File) {
+  IO.mapRequired("Name", File.Name);
+  IO.mapRequired("DirIdx", File.DirIdx);
+  IO.mapRequired("ModTime", File.ModTime);
+  IO.mapRequired("Length", File.Length);
+}
+
+void MappingTraits<DWARFYAML::LineTableOpcode>::mapping(
+    IO &IO, DWARFYAML::LineTableOpcode &LineTableOpcode) {
+  IO.mapRequired("Opcode", LineTableOpcode.Opcode);
+  if (LineTableOpcode.Opcode == dwarf::DW_LNS_extended_op) {
+    IO.mapRequired("ExtLen", LineTableOpcode.ExtLen);
+    IO.mapRequired("SubOpcode", LineTableOpcode.SubOpcode);
+  }
+
+  if (!LineTableOpcode.UnknownOpcodeData.empty() || !IO.outputting())
+    IO.mapOptional("UnknownOpcodeData", LineTableOpcode.UnknownOpcodeData);
+  if (!LineTableOpcode.UnknownOpcodeData.empty() || !IO.outputting())
+    IO.mapOptional("StandardOpcodeData", LineTableOpcode.StandardOpcodeData);
+  if (!LineTableOpcode.FileEntry.Name.empty() || !IO.outputting())
+    IO.mapOptional("FileEntry", LineTableOpcode.FileEntry);
+  if (LineTableOpcode.Opcode == dwarf::DW_LNS_advance_line || !IO.outputting())
+    IO.mapOptional("SData", LineTableOpcode.SData);
+  IO.mapOptional("Data", LineTableOpcode.Data);
+}
+
+void MappingTraits<DWARFYAML::LineTable>::mapping(
+    IO &IO, DWARFYAML::LineTable &LineTable) {
+  IO.mapRequired("TotalLength", LineTable.TotalLength);
+  if (LineTable.TotalLength == UINT32_MAX)
+    IO.mapRequired("TotalLength64", LineTable.TotalLength64);
+  IO.mapRequired("Version", LineTable.Version);
+  IO.mapRequired("PrologueLength", LineTable.PrologueLength);
+  IO.mapRequired("MinInstLength", LineTable.MinInstLength);
+  if(LineTable.Version >= 4)
+    IO.mapRequired("MaxOpsPerInst", LineTable.MaxOpsPerInst);
+  IO.mapRequired("DefaultIsStmt", LineTable.DefaultIsStmt);
+  IO.mapRequired("LineBase", LineTable.LineBase);
+  IO.mapRequired("LineRange", LineTable.LineRange);
+  IO.mapRequired("OpcodeBase", LineTable.OpcodeBase);
+  IO.mapRequired("StandardOpcodeLengths", LineTable.StandardOpcodeLengths);
+  IO.mapRequired("IncludeDirs", LineTable.IncludeDirs);
+  IO.mapRequired("Files", LineTable.Files);
+  IO.mapRequired("Opcodes", LineTable.Opcodes);
+}
+
 } // namespace llvm::yaml
 
 } // namespace llvm