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Use a pointer to keep track of the skeleton unit for each normal unit

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and construct it up front. Add address ranges at the end and a helper
routine so that we're not needlessly using an indirction in the case
of split dwarf.

Update testcases according to the new ordering of attributes on
the compile unit.

llvm-svn: 198196
This commit is contained in:
Eric Christopher 2013-12-30 03:02:12 +00:00
parent 583b8a7116
commit da5f0a0247
5 changed files with 58 additions and 32 deletions
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46
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -773,12 +773,6 @@ DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
DIUnit.getLanguage());
NewCU->addString(Die, dwarf::DW_AT_name, FN);
// 2.17.1 requires that we use DW_AT_low_pc for a single entry point
// into an entity. We're using 0 (or a NULL label) for this. For
// split dwarf it's in the skeleton CU so omit it here.
if (!useSplitDwarf())
NewCU->addLabelAddress(Die, dwarf::DW_AT_low_pc, NULL);
// Define start line table label for each Compile Unit.
MCSymbol *LineTableStartSym =
Asm->GetTempSymbol("line_table_start", NewCU->getUniqueID());
@ -837,6 +831,10 @@ DwarfCompileUnit *DwarfDebug::constructDwarfCompileUnit(DICompileUnit DIUnit) {
// skeleton units, not full units, if it's going to reference skeletons
DwarfInfoSectionSym);
// If we're splitting the dwarf then construct the skeleton CU now.
if (useSplitDwarf())
NewCU->setSkeleton(constructSkeletonCU(NewCU));
CUMap.insert(std::make_pair(DIUnit, NewCU));
CUDieMap.insert(std::make_pair(Die, NewCU));
return NewCU;
@ -1082,7 +1080,9 @@ void DwarfDebug::finalizeModuleInfo() {
// Add CU specific attributes if we need to add any.
if (TheU->getUnitDie()->getTag() == dwarf::DW_TAG_compile_unit) {
// If we're splitting the dwarf out now that we've got the entire
// CU then construct a skeleton CU based upon it.
// CU then add the dwo id to it.
DwarfCompileUnit *SkCU =
static_cast<DwarfCompileUnit *>(TheU->getSkeleton());
if (useSplitDwarf()) {
// This should be a unique identifier when we want to build .dwp files.
uint64_t ID = 0;
@ -1092,19 +1092,22 @@ void DwarfDebug::finalizeModuleInfo() {
}
TheU->addUInt(TheU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
dwarf::DW_FORM_data8, ID);
// Now construct the skeleton CU associated.
DwarfCompileUnit *SkCU =
constructSkeletonCU(static_cast<DwarfCompileUnit *>(TheU));
SkCU->addUInt(SkCU->getUnitDie(), dwarf::DW_AT_GNU_dwo_id,
dwarf::DW_FORM_data8, ID);
} else {
// Attribute if we've emitted a range list for the compile unit, this
// will get constructed for the skeleton CU separately if we have one.
if (DwarfCURanges && TheU->getRanges().size())
addSectionLabel(Asm, TheU, TheU->getUnitDie(), dwarf::DW_AT_ranges,
Asm->GetTempSymbol("cu_ranges", TheU->getUniqueID()),
DwarfDebugRangeSectionSym);
}
// If we've requested ranges and have them emit a DW_AT_ranges attribute
// on the unit that will remain in the .o file, otherwise add a DW_AT_low_pc.
// FIXME: Also add a high pc if we can.
// FIXME: We should use ranges if we have multiple compile units.
DwarfCompileUnit *U = SkCU ? SkCU : static_cast<DwarfCompileUnit *>(TheU);
if (DwarfCURanges && TheU->getRanges().size())
addSectionLabel(Asm, U, U->getUnitDie(), dwarf::DW_AT_ranges,
Asm->GetTempSymbol("cu_ranges", U->getUniqueID()),
DwarfDebugRangeSectionSym);
else
U->addLocalLabelAddress(U->getUnitDie(), dwarf::DW_AT_low_pc,
TextSectionSym);
}
}
@ -2997,15 +3000,6 @@ DwarfCompileUnit *DwarfDebug::constructSkeletonCU(const DwarfCompileUnit *CU) {
else
NewCU->addSectionOffset(Die, dwarf::DW_AT_GNU_addr_base, 0);
// Attribute if we've emitted a range list for the compile unit, this
// will get constructed for the skeleton CU separately if we have one.
if (DwarfCURanges && CU->getRanges().size())
addSectionLabel(Asm, NewCU, Die, dwarf::DW_AT_ranges,
Asm->GetTempSymbol("cu_ranges", CU->getUniqueID()),
DwarfDebugRangeSectionSym);
else
NewCU->addUInt(Die, dwarf::DW_AT_low_pc, dwarf::DW_FORM_addr, 0);
// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section.
// FIXME: Should handle multiple compile units.

17
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -293,6 +293,23 @@ void DwarfCompileUnit::addLabelAddress(DIE *Die, dwarf::Attribute Attribute,
}
}
/// addLocalLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr.
void DwarfCompileUnit::addLocalLabelAddress(DIE *Die,
dwarf::Attribute Attribute,
MCSymbol *Label) {
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
if (Label != NULL) {
DIEValue *Value = new (DIEValueAllocator) DIELabel(Label);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
} else {
DIEValue *Value = new (DIEValueAllocator) DIEInteger(0);
Die->addValue(Attribute, dwarf::DW_FORM_addr, Value);
}
}
/// addOpAddress - Add a dwarf op address data and value using the
/// form given and an op of either DW_FORM_addr or DW_FORM_GNU_addr_index.
///

14
lib/CodeGen/AsmPrinter/DwarfUnit.h
View File

@ -146,12 +146,21 @@ protected:
/// The label for the start of the range sets for the elements of this unit.
MCSymbol *LabelRange;
/// Skeleton unit associated with this unit.
DwarfUnit *Skeleton;
DwarfUnit(unsigned UID, DIE *D, DICompileUnit CU, AsmPrinter *A,
DwarfDebug *DW, DwarfFile *DWU);
public:
virtual ~DwarfUnit();
/// Set the skeleton unit associated with this unit.
void setSkeleton(DwarfUnit *Skel) { Skeleton = Skel; }
/// Get the skeleton unit associated with this unit.
DwarfUnit *getSkeleton() const { return Skeleton; }
/// Pass in the SectionSym even though we could recreate it in every compile
/// unit (type units will have actually distinct symbols once they're in
/// comdat sections).
@ -521,6 +530,11 @@ public:
/// either DW_FORM_addr or DW_FORM_GNU_addr_index.
void addLabelAddress(DIE *Die, dwarf::Attribute Attribute, MCSymbol *Label);
/// addLocalLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr.
void addLocalLabelAddress(DIE *Die, dwarf::Attribute Attribute,
MCSymbol *Label);
uint16_t getLanguage() const LLVM_OVERRIDE { return getNode().getLanguage(); }
};

5
test/DebugInfo/X86/fission-cu.ll
View File

@ -25,19 +25,19 @@
; CHECK: [1] DW_TAG_compile_unit DW_CHILDREN_no
; CHECK: DW_AT_GNU_dwo_name DW_FORM_strp
; CHECK: DW_AT_GNU_addr_base DW_FORM_sec_offset
; CHECK: DW_AT_low_pc DW_FORM_addr
; CHECK: DW_AT_stmt_list DW_FORM_sec_offset
; CHECK: DW_AT_comp_dir DW_FORM_strp
; CHECK: DW_AT_GNU_dwo_id DW_FORM_data8
; CHECK: DW_AT_low_pc DW_FORM_addr
; CHECK: .debug_info contents:
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_GNU_dwo_name [DW_FORM_strp] ( .debug_str[0x00000000] = "baz.dwo")
; CHECK: DW_AT_GNU_addr_base [DW_FORM_sec_offset] (0x00000000)
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
; CHECK: DW_AT_comp_dir [DW_FORM_strp] ( .debug_str[0x00000008] = "/usr/local/google/home/echristo/tmp")
; CHECK: DW_AT_GNU_dwo_id [DW_FORM_data8] (0x0000000000000000)
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: .debug_str contents:
; CHECK: 0x00000000: "baz.dwo"
@ -110,5 +110,6 @@
; OBJ-NEXT: R_X86_64_32 .debug_addr
; OBJ-NEXT: R_X86_64_32 .debug_line
; OBJ-NEXT: R_X86_64_32 .debug_str
; OBJ-NEXT: R_X86_64_64 .text 0x0
; OBJ-NEXT: }
!9 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}

8
test/DebugInfo/X86/stmt-list-multiple-compile-units.ll
View File

@ -7,12 +7,12 @@
; rdar://13067005
; CHECK: .debug_info contents:
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x00000000)
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: DW_TAG_compile_unit
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: DW_AT_stmt_list [DW_FORM_sec_offset] (0x0000003c)
; CHECK: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; CHECK: .debug_line contents:
; CHECK-NEXT: Line table prologue:
@ -25,12 +25,12 @@
; DWARF3: .debug_info contents:
; DWARF3: DW_TAG_compile_unit
; DWARF3: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; DWARF3: DW_AT_stmt_list [DW_FORM_data4] (0x00000000)
; DWARF3: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; DWARF3: DW_TAG_compile_unit
; DWARF3: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; DWARF3: DW_AT_stmt_list [DW_FORM_data4] (0x0000003c)
; DWARF3: DW_AT_low_pc [DW_FORM_addr] (0x0000000000000000)
; DWARF3: .debug_line contents:
; DWARF3-NEXT: Line table prologue: