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
diff --git a/include/llvm/Target/TargetAsmInfo.h b/include/llvm/Target/TargetAsmInfo.h
index a1f4553..cf8f7a5 100644
--- a/include/llvm/Target/TargetAsmInfo.h
+++ b/include/llvm/Target/TargetAsmInfo.h
@@ -227,6 +227,10 @@
///
bool HasDotFile; // Defaults to false.
+ /// RequiresFrameSection - true if the Dwarf2 output needs a frame section
+ ///
+ bool DwarfRequiresFrameSection; // Defaults to false.
+
/// DwarfAbbrevSection - Section directive for Dwarf abbrev.
///
const char *DwarfAbbrevSection; // Defaults to ".debug_abbrev".
@@ -417,6 +421,9 @@
bool hasDotFile() const {
return HasDotFile;
}
+ bool getDwarfRequiresFrameSection() const {
+ return DwarfRequiresFrameSection;
+ }
const char *getDwarfAbbrevSection() const {
return DwarfAbbrevSection;
}
diff --git a/lib/CodeGen/DwarfWriter.cpp b/lib/CodeGen/DwarfWriter.cpp
index fbcf641..40de586 100644
--- a/lib/CodeGen/DwarfWriter.cpp
+++ b/lib/CodeGen/DwarfWriter.cpp
@@ -1921,8 +1921,8 @@
unsigned ID) {
// Construct debug information entry.
DIE *Die = new DIE(DW_TAG_compile_unit);
- Die->AddDelta (DW_AT_stmt_list, DW_FORM_data4, DWLabel("line", 0),
- DWLabel("section_line", 0));
+ Die->AddDelta (DW_AT_stmt_list, DW_FORM_data4, DWLabel("section_line", 0),
+ DWLabel("section_line", 0));
// Die->AddLabel (DW_AT_high_pc, DW_FORM_addr, DWLabel("text_end", 0));
// Die->AddLabel (DW_AT_low_pc, DW_FORM_addr, DWLabel("text_begin", 0));
Die->AddString(DW_AT_producer, DW_FORM_string, UnitDesc->getProducer());
@@ -2175,21 +2175,20 @@
didInitial = true;
// Dwarf sections base addresses.
- Asm->SwitchToDataSection(TAI->getDwarfFrameSection(), 0);
- EmitLabel("section_frame", 0);
+ if (TAI->getDwarfRequiresFrameSection()) {
+ Asm->SwitchToDataSection(TAI->getDwarfFrameSection(), 0);
+ EmitLabel("section_frame", 0);
+ }
Asm->SwitchToDataSection(TAI->getDwarfInfoSection(), 0);
EmitLabel("section_info", 0);
- EmitLabel("info", 0);
Asm->SwitchToDataSection(TAI->getDwarfAbbrevSection(), 0);
EmitLabel("section_abbrev", 0);
- EmitLabel("abbrev", 0);
Asm->SwitchToDataSection(TAI->getDwarfARangesSection(), 0);
EmitLabel("section_aranges", 0);
Asm->SwitchToDataSection(TAI->getDwarfMacInfoSection(), 0);
EmitLabel("section_macinfo", 0);
Asm->SwitchToDataSection(TAI->getDwarfLineSection(), 0);
EmitLabel("section_line", 0);
- EmitLabel("line", 0);
Asm->SwitchToDataSection(TAI->getDwarfLocSection(), 0);
EmitLabel("section_loc", 0);
Asm->SwitchToDataSection(TAI->getDwarfPubNamesSection(), 0);
@@ -2198,7 +2197,6 @@
EmitLabel("section_str", 0);
Asm->SwitchToDataSection(TAI->getDwarfRangesSection(), 0);
EmitLabel("section_ranges", 0);
-
Asm->SwitchToTextSection(TAI->getTextSection(), 0);
EmitLabel("text_begin", 0);
Asm->SwitchToDataSection(TAI->getDataSection(), 0);
@@ -2629,6 +2627,9 @@
/// EmitInitialDebugFrame - Emit common frame info into a debug frame section.
///
void Dwarf::EmitInitialDebugFrame() {
+ if (TAI->getDwarfRequiresFrameSection())
+ return;
+
int stackGrowth =
Asm->TM.getFrameInfo()->getStackGrowthDirection() ==
TargetFrameInfo::StackGrowsUp ?
@@ -2664,6 +2665,9 @@
/// EmitFunctionDebugFrame - Emit per function frame info into a debug frame
/// section.
void Dwarf::EmitFunctionDebugFrame() {
+ if (TAI->getDwarfRequiresFrameSection())
+ return;
+
// Start the dwarf frame section.
Asm->SwitchToDataSection(TAI->getDwarfFrameSection(), 0);
diff --git a/lib/Target/TargetAsmInfo.cpp b/lib/Target/TargetAsmInfo.cpp
index b4014dd..d68affd 100644
--- a/lib/Target/TargetAsmInfo.cpp
+++ b/lib/Target/TargetAsmInfo.cpp
@@ -64,6 +64,7 @@
HasLEB128(false),
HasDotLoc(false),
HasDotFile(false),
+ DwarfRequiresFrameSection(true),
DwarfAbbrevSection(".debug_abbrev"),
DwarfInfoSection(".debug_info"),
DwarfLineSection(".debug_line"),
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 @@
/// 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 @@
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 @@
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 @@
// 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 @@
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 @@
// 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 @@
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 @@
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 @@
[(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 @@
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;