Add debug support for X86/ELF targets (Linux). This allows llvm-gcc4

generated object modules to be debugged with gdb. Hopefully this helps
pre-release debugging.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31299 91177308-0d34-0410-b5e6-96231b3b80d8

6 files changed, 39 insertions, 9 deletions

diff --git a/lib/Target/X86/X86ATTAsmPrinter.cpp b/lib/Target/X86/X86ATTAsmPrinter.cpp
index dc2ecca..42af5b6 100755
--- a/lib/Target/X86/X86ATTAsmPrinter.cpp
+++ b/lib/Target/X86/X86ATTAsmPrinter.cpp
@@ -52,7 +52,7 @@ std::string X86ATTAsmPrinter::getSectionForFunction(const Function &F) const {
 /// method to print assembly for each instruction.
 ///
 bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
-  if (Subtarget->isTargetDarwin()) {
+  if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF()) {
     // Let PassManager know we need debug information and relay
     // the MachineDebugInfo address on to DwarfWriter.
     DW.SetDebugInfo(&getAnalysis<MachineDebugInfo>());
@@ -111,7 +111,7 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
        F->getLinkage() == Function::WeakLinkage))
     O << "_llvm$workaround$fake$stub_" << CurrentFnName << ":\n";
 
-  if (Subtarget->isTargetDarwin()) {
+  if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF()) {
     // Emit pre-function debug information.
     DW.BeginFunction(&MF);
   }
@@ -141,7 +141,7 @@ bool X86ATTAsmPrinter::runOnMachineFunction(MachineFunction &MF) {
   if (TAI->hasDotTypeDotSizeDirective())
     O << "\t.size " << CurrentFnName << ", .-" << CurrentFnName << "\n";
 
-  if (Subtarget->isTargetDarwin()) {
+  if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF()) {
     // Emit post-function debug information.
     DW.EndFunction();
   }
diff --git a/lib/Target/X86/X86AsmPrinter.cpp b/lib/Target/X86/X86AsmPrinter.cpp
index 38dbe57..6031651 100644
--- a/lib/Target/X86/X86AsmPrinter.cpp
+++ b/lib/Target/X86/X86AsmPrinter.cpp
@@ -116,6 +116,9 @@ bool X86SharedAsmPrinter::doInitialization(Module &M) {
 
     // Emit initial debug information.
     DW.BeginModule(&M);
+  } else if (Subtarget->isTargetELF()) {
+    // Emit initial debug information.
+    DW.BeginModule(&M);
   }
 
   return AsmPrinter::doInitialization(M);
@@ -278,7 +281,7 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
       O << "\t.long\t0\n";
     }
 
-    // Emit initial debug information.
+    // Emit final debug information.
     DW.EndModule();
 
     // Funny Darwin hack: This flag tells the linker that no global symbols
@@ -287,6 +290,9 @@ bool X86SharedAsmPrinter::doFinalization(Module &M) {
     // linker can safely perform dead code stripping.  Since LLVM never
     // generates code that does this, it is always safe to set.
     O << "\t.subsections_via_symbols\n";
+  } else if (Subtarget->isTargetELF()) {
+    // Emit final debug information.
+    DW.EndModule();
   }
 
   AsmPrinter::doFinalization(M);
diff --git a/lib/Target/X86/X86AsmPrinter.h b/lib/Target/X86/X86AsmPrinter.h
index 1bbfa55..b2fbe05 100755
--- a/lib/Target/X86/X86AsmPrinter.h
+++ b/lib/Target/X86/X86AsmPrinter.h
@@ -67,7 +67,7 @@ struct VISIBILITY_HIDDEN X86SharedAsmPrinter : public AsmPrinter {
 
   void getAnalysisUsage(AnalysisUsage &AU) const {
     AU.setPreservesAll();
-    if (Subtarget->isTargetDarwin()) {
+    if (Subtarget->isTargetDarwin() || Subtarget->isTargetELF()) {
       AU.addRequired<MachineDebugInfo>();
     }
     MachineFunctionPass::getAnalysisUsage(AU);
diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 0b85506..6de5032 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -219,7 +219,7 @@ X86TargetLowering::X86TargetLowering(TargetMachine &TM)
   setOperationAction(ISD::LOCATION, MVT::Other, Expand);
   setOperationAction(ISD::DEBUG_LOC, MVT::Other, Expand);
   // FIXME - use subtarget debug flags
-  if (!Subtarget->isTargetDarwin())
+  if (!Subtarget->isTargetDarwin() && !Subtarget->isTargetELF())
     setOperationAction(ISD::DEBUG_LABEL, MVT::Other, Expand);
 
   // VASTART needs to be custom lowered to use the VarArgsFrameIndex
diff --git a/lib/Target/X86/X86InstrInfo.td b/lib/Target/X86/X86InstrInfo.td
index 509fb05..359513c 100644
--- a/lib/Target/X86/X86InstrInfo.td
+++ b/lib/Target/X86/X86InstrInfo.td
@@ -2451,9 +2451,9 @@ def DWARF_LOC   : I<0, Pseudo, (ops i32imm:$line, i32imm:$col, i32imm:$file),
                     [(dwarf_loc (i32 imm:$line), (i32 imm:$col),
                       (i32 imm:$file))]>;
 
-def DWARF_LABEL : I<0, Pseudo, (ops i32imm:$id),
-                   "\nLdebug_loc${id:debug}:",
-                   [(dwarf_label (i32 imm:$id))]>;
+def DWARF_LABEL : I<0, Pseudo, (ops i32imm:$id), 
+                    "\n${:private}debug_loc${id:debug}:",
+                    [(dwarf_label (i32 imm:$id))]>;
 
 //===----------------------------------------------------------------------===//
 // Non-Instruction Patterns
diff --git a/lib/Target/X86/X86TargetAsmInfo.cpp b/lib/Target/X86/X86TargetAsmInfo.cpp
index e677737..93596c0 100644
--- a/lib/Target/X86/X86TargetAsmInfo.cpp
+++ b/lib/Target/X86/X86TargetAsmInfo.cpp
@@ -60,6 +60,30 @@ X86TargetAsmInfo::X86TargetAsmInfo(const X86TargetMachine &TM) {
     DwarfRangesSection = ".section __DWARF,__debug_ranges,regular,debug";
     DwarfMacInfoSection = ".section __DWARF,__debug_macinfo,regular,debug";
     break;
+
+  case X86Subtarget::isELF:
+    // Set up DWARF directives
+    HasLEB128 = true;  // Target asm supports leb128 directives (little-endian)
+    // bool HasLEB128; // Defaults to false.
+    // hasDotLoc - True if target asm supports .loc directives.
+    // bool HasDotLoc; // Defaults to false.
+    // HasDotFile - True if target asm supports .file directives.
+    // bool HasDotFile; // Defaults to false.
+    PrivateGlobalPrefix = ".";  // Prefix for private global symbols
+    DwarfRequiresFrameSection = false;
+    DwarfAbbrevSection =  "\t.section\t.debug_abbrev,\"\",@progbits";
+    DwarfInfoSection =    "\t.section\t.debug_info,\"\",@progbits";
+    DwarfLineSection =    "\t.section\t.debug_line,\"\",@progbits";
+    DwarfFrameSection =   "\t.section\t.debug_frame,\"\",@progbits";
+    DwarfPubNamesSection ="\t.section\t.debug_pubnames,\"\",@progbits";
+    DwarfPubTypesSection ="\t.section\t.debug_pubtypes,\"\",@progbits";
+    DwarfStrSection =     "\t.section\t.debug_str,\"\",@progbits";
+    DwarfLocSection =     "\t.section\t.debug_loc,\"\",@progbits";
+    DwarfARangesSection = "\t.section\t.debug_aranges,\"\",@progbits";
+    DwarfRangesSection =  "\t.section\t.debug_ranges,\"\",@progbits";
+    DwarfMacInfoSection = "\t.section\t.debug_macinfo,\"\",@progbits";
+    break;
+
   case X86Subtarget::isCygwin:
     GlobalPrefix = "_";
     COMMDirectiveTakesAlignment = false;