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Move DwarfCompileUnit from DwarfUnit.h to its own header (DwarfCompileUnit.h)

Browse Source 
In preparation for sinking all the subprogram emission code down from
DwarfDebug into DwarfCompileUnit, this will avoid bloating
DwarfUnit.h/cpp greatly and make concerns a bit more clear/isolated.

(sinking this handling down is part of the work to handle emitting
minimal subprograms for -gmlt-like data into the skeleton CU under
fission)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@219057 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2014-10-04 15:49:50 +00:00
parent f13b76b94f
commit a2ec9db66b
7 changed files with 352 additions and 300 deletions
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1
lib/CodeGen/AsmPrinter/CMakeLists.txt
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@ -9,6 +9,7 @@ add_llvm_library(LLVMAsmPrinter
DIEHash.cpp
DwarfAccelTable.cpp
DwarfCFIException.cpp
DwarfCompileUnit.cpp
DwarfDebug.cpp
DwarfFile.cpp
DwarfStringPool.cpp

2
lib/CodeGen/AsmPrinter/DIE.cpp
View File

@ -12,6 +12,8 @@
//===----------------------------------------------------------------------===//
#include "DIE.h"
#include "DwarfCompileUnit.h"
#include "DwarfDebug.h"
#include "DwarfUnit.h"
#include "llvm/ADT/Twine.h"

277
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp Normal file
View File

@ -0,0 +1,277 @@
#include "DwarfCompileUnit.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Instruction.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/Target/TargetLoweringObjectFile.h"
namespace llvm {
DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node,
AsmPrinter *A, DwarfDebug *DW,
DwarfFile *DWU)
: DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU) {
insertDIE(Node, &getUnitDie());
}
/// addLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr or DW_FORM_GNU_addr_index.
///
void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label) {
// Don't use the address pool in non-fission or in the skeleton unit itself.
// FIXME: Once GDB supports this, it's probably worthwhile using the address
// pool from the skeleton - maybe even in non-fission (possibly fewer
// relocations by sharing them in the pool, but we have other ideas about how
// to reduce the number of relocations as well/instead).
if (!DD->useSplitDwarf() || !Skeleton)
return addLocalLabelAddress(Die, Attribute, Label);
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
unsigned idx = DD->getAddressPool().getIndex(Label);
DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
}
void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
dwarf::Attribute Attribute,
const MCSymbol *Label) {
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
Die.addValue(Attribute, dwarf::DW_FORM_addr,
Label ? (DIEValue *)new (DIEValueAllocator) DIELabel(Label)
: new (DIEValueAllocator) DIEInteger(0));
}
unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) {
// If we print assembly, we can't separate .file entries according to
// compile units. Thus all files will belong to the default compile unit.
// FIXME: add a better feature test than hasRawTextSupport. Even better,
// extend .file to support this.
return Asm->OutStreamer.EmitDwarfFileDirective(
0, DirName, FileName,
Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID());
}
// Return const expression if value is a GEP to access merged global
// constant. e.g.
// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
if (!CE || CE->getNumOperands() != 3 ||
CE->getOpcode() != Instruction::GetElementPtr)
return nullptr;
// First operand points to a global struct.
Value *Ptr = CE->getOperand(0);
if (!isa<GlobalValue>(Ptr) ||
!isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
return nullptr;
// Second operand is zero.
const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
if (!CI || !CI->isZero())
return nullptr;
// Third operand is offset.
if (!isa<ConstantInt>(CE->getOperand(2)))
return nullptr;
return CE;
}
/// getOrCreateGlobalVariableDIE - get or create global variable DIE.
DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(DIGlobalVariable GV) {
// Check for pre-existence.
if (DIE *Die = getDIE(GV))
return Die;
assert(GV.isGlobalVariable());
DIScope GVContext = GV.getContext();
DIType GTy = DD->resolve(GV.getType());
// If this is a static data member definition, some attributes belong
// to the declaration DIE.
DIE *VariableDIE = nullptr;
bool IsStaticMember = false;
DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
if (SDMDecl.Verify()) {
assert(SDMDecl.isStaticMember() && "Expected static member decl");
// We need the declaration DIE that is in the static member's class.
VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
IsStaticMember = true;
}
// If this is not a static data member definition, create the variable
// DIE and add the initial set of attributes to it.
if (!VariableDIE) {
// Construct the context before querying for the existence of the DIE in
// case such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(GVContext);
// Add to map.
VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
// Add name and type.
addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
addType(*VariableDIE, GTy);
// Add scoping info.
if (!GV.isLocalToUnit())
addFlag(*VariableDIE, dwarf::DW_AT_external);
// Add line number info.
addSourceLine(*VariableDIE, GV);
}
// Add location.
bool addToAccelTable = false;
DIE *VariableSpecDIE = nullptr;
bool isGlobalVariable = GV.getGlobal() != nullptr;
if (isGlobalVariable) {
addToAccelTable = true;
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
if (GV.getGlobal()->isThreadLocal()) {
// FIXME: Make this work with -gsplit-dwarf.
unsigned PointerSize = Asm->getDataLayout().getPointerSize();
assert((PointerSize == 4 || PointerSize == 8) &&
"Add support for other sizes if necessary");
// Based on GCC's support for TLS:
if (!DD->useSplitDwarf()) {
// 1) Start with a constNu of the appropriate pointer size
addUInt(*Loc, dwarf::DW_FORM_data1,
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
// 2) containing the (relocated) offset of the TLS variable
// within the module's TLS block.
addExpr(*Loc, dwarf::DW_FORM_udata,
Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym));
} else {
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
addUInt(*Loc, dwarf::DW_FORM_udata,
DD->getAddressPool().getIndex(Sym, /* TLS */ true));
}
// 3) followed by a custom OP to make the debugger do a TLS lookup.
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
} else {
DD->addArangeLabel(SymbolCU(this, Sym));
addOpAddress(*Loc, Sym);
}
// A static member's declaration is already flagged as such.
if (!SDMDecl.Verify() && !GV.isDefinition())
addFlag(*VariableDIE, dwarf::DW_AT_declaration);
// Do not create specification DIE if context is either compile unit
// or a subprogram.
if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
!GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
// Create specification DIE.
VariableSpecDIE = &createAndAddDIE(dwarf::DW_TAG_variable, UnitDie);
addDIEEntry(*VariableSpecDIE, dwarf::DW_AT_specification, *VariableDIE);
addBlock(*VariableSpecDIE, dwarf::DW_AT_location, Loc);
// A static member's declaration is already flagged as such.
if (!SDMDecl.Verify())
addFlag(*VariableDIE, dwarf::DW_AT_declaration);
} else {
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
}
// Add the linkage name.
StringRef LinkageName = GV.getLinkageName();
if (!LinkageName.empty())
// From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
// TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
// TAG_variable.
addString(IsStaticMember && VariableSpecDIE ? *VariableSpecDIE
: *VariableDIE,
DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
: dwarf::DW_AT_MIPS_linkage_name,
GlobalValue::getRealLinkageName(LinkageName));
} else if (const ConstantInt *CI =
dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
// AT_const_value was added when the static member was created. To avoid
// emitting AT_const_value multiple times, we only add AT_const_value when
// it is not a static member.
if (!IsStaticMember)
addConstantValue(*VariableDIE, CI, GTy);
} else if (const ConstantExpr *CE = getMergedGlobalExpr(GV.getConstant())) {
addToAccelTable = true;
// GV is a merged global.
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
Value *Ptr = CE->getOperand(0);
MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr));
DD->addArangeLabel(SymbolCU(this, Sym));
addOpAddress(*Loc, Sym);
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
addUInt(*Loc, dwarf::DW_FORM_udata,
Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
}
DIE *ResultDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
if (addToAccelTable) {
DD->addAccelName(GV.getName(), *ResultDIE);
// If the linkage name is different than the name, go ahead and output
// that as well into the name table.
if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
DD->addAccelName(GV.getLinkageName(), *ResultDIE);
}
addGlobalName(GV.getName(), *ResultDIE, GV.getContext());
return ResultDIE;
}
void DwarfCompileUnit::addRange(RangeSpan Range) {
bool SameAsPrevCU = this == DD->getPrevCU();
DD->setPrevCU(this);
// If we have no current ranges just add the range and return, otherwise,
// check the current section and CU against the previous section and CU we
// emitted into and the subprogram was contained within. If these are the
// same then extend our current range, otherwise add this as a new range.
if (CURanges.empty() || !SameAsPrevCU ||
(&CURanges.back().getEnd()->getSection() !=
&Range.getEnd()->getSection())) {
CURanges.push_back(Range);
return;
}
CURanges.back().setEnd(Range.getEnd());
}
void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
// Define start line table label for each Compile Unit.
MCSymbol *LineTableStartSym =
Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID());
stmtListIndex = UnitDie.getValues().size();
// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section. For split dwarf this is
// left in the skeleton CU and so not included.
// The line table entries are not always emitted in assembly, so it
// is not okay to use line_table_start here.
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym);
else
addSectionDelta(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
DwarfLineSectionSym);
}
void DwarfCompileUnit::applyStmtList(DIE &D) {
D.addValue(dwarf::DW_AT_stmt_list,
UnitDie.getAbbrev().getData()[stmtListIndex].getForm(),
UnitDie.getValues()[stmtListIndex]);
}
} // end llvm namespace

67
lib/CodeGen/AsmPrinter/DwarfCompileUnit.h Normal file
View File

@ -0,0 +1,67 @@
//===-- llvm/CodeGen/DwarfCompileUnit.h - Dwarf Compile Unit ---*- C++ -*--===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains support for writing dwarf compile unit.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
#include "DwarfUnit.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/IR/DebugInfo.h"
namespace llvm {
class AsmPrinter;
class DIE;
class DwarfDebug;
class DwarfFile;
class MCSymbol;
class DwarfCompileUnit : public DwarfUnit {
/// The attribute index of DW_AT_stmt_list in the compile unit DIE, avoiding
/// the need to search for it in applyStmtList.
unsigned stmtListIndex;
public:
DwarfCompileUnit(unsigned UID, DICompileUnit Node, AsmPrinter *A,
DwarfDebug *DW, DwarfFile *DWU);
void initStmtList(MCSymbol *DwarfLineSectionSym);
/// Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
void applyStmtList(DIE &D);
/// getOrCreateGlobalVariableDIE - get or create global variable DIE.
DIE *getOrCreateGlobalVariableDIE(DIGlobalVariable GV);
/// addLabelAddress - Add a dwarf label attribute data and value using
/// either DW_FORM_addr or DW_FORM_GNU_addr_index.
void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label);
/// addLocalLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr only.
void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label);
DwarfCompileUnit &getCU() override { return *this; }
unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override;
/// addRange - Add an address range to the list of ranges for this unit.
void addRange(RangeSpan Range);
};
} // end llvm namespace
#endif

4
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -11,8 +11,10 @@
//
//===----------------------------------------------------------------------===//
#include "ByteStreamer.h"
#include "DwarfDebug.h"
#include "ByteStreamer.h"
#include "DwarfCompileUnit.h"
#include "DIE.h"
#include "DIEHash.h"
#include "DwarfUnit.h"

266
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -12,7 +12,9 @@
//===----------------------------------------------------------------------===//
#include "DwarfUnit.h"
#include "DwarfAccelTable.h"
#include "DwarfCompileUnit.h"
#include "DwarfDebug.h"
#include "llvm/ADT/APFloat.h"
#include "llvm/IR/Constants.h"
@ -52,13 +54,6 @@ DwarfUnit::DwarfUnit(unsigned UID, dwarf::Tag UnitTag, DICompileUnit Node,
DIEIntegerOne = new (DIEValueAllocator) DIEInteger(1);
}
DwarfCompileUnit::DwarfCompileUnit(unsigned UID, DICompileUnit Node,
AsmPrinter *A, DwarfDebug *DW,
DwarfFile *DWU)
: DwarfUnit(UID, dwarf::DW_TAG_compile_unit, Node, A, DW, DWU) {
insertDIE(Node, &getUnitDie());
}
DwarfTypeUnit::DwarfTypeUnit(unsigned UID, DwarfCompileUnit &CU, AsmPrinter *A,
DwarfDebug *DW, DwarfFile *DWU,
MCDwarfDwoLineTable *SplitLineTable)
@ -280,50 +275,6 @@ void DwarfUnit::addSectionOffset(DIE &Die, dwarf::Attribute Attribute,
addUInt(Die, Attribute, dwarf::DW_FORM_data4, Integer);
}
/// addLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr or DW_FORM_GNU_addr_index.
///
void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label) {
// Don't use the address pool in non-fission or in the skeleton unit itself.
// FIXME: Once GDB supports this, it's probably worthwhile using the address
// pool from the skeleton - maybe even in non-fission (possibly fewer
// relocations by sharing them in the pool, but we have other ideas about how
// to reduce the number of relocations as well/instead).
if (!DD->useSplitDwarf() || !Skeleton)
return addLocalLabelAddress(Die, Attribute, Label);
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
unsigned idx = DD->getAddressPool().getIndex(Label);
DIEValue *Value = new (DIEValueAllocator) DIEInteger(idx);
Die.addValue(Attribute, dwarf::DW_FORM_GNU_addr_index, Value);
}
void DwarfCompileUnit::addLocalLabelAddress(DIE &Die,
dwarf::Attribute Attribute,
const MCSymbol *Label) {
if (Label)
DD->addArangeLabel(SymbolCU(this, Label));
Die.addValue(Attribute, dwarf::DW_FORM_addr,
Label ? (DIEValue *)new (DIEValueAllocator) DIELabel(Label)
: new (DIEValueAllocator) DIEInteger(0));
}
unsigned DwarfCompileUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) {
// If we print assembly, we can't separate .file entries according to
// compile units. Thus all files will belong to the default compile unit.
// FIXME: add a better feature test than hasRawTextSupport. Even better,
// extend .file to support this.
return Asm->OutStreamer.EmitDwarfFileDirective(
0, DirName, FileName,
Asm->OutStreamer.hasRawTextSupport() ? 0 : getUniqueID());
}
unsigned DwarfTypeUnit::getOrCreateSourceID(StringRef FileName, StringRef DirName) {
return SplitLineTable ? SplitLineTable->getFile(DirName, FileName)
: getCU().getOrCreateSourceID(FileName, DirName);
@ -1573,177 +1524,6 @@ void DwarfUnit::applyVariableAttributes(const DbgVariable &Var,
addFlag(VariableDie, dwarf::DW_AT_artificial);
}
// Return const expression if value is a GEP to access merged global
// constant. e.g.
// i8* getelementptr ({ i8, i8, i8, i8 }* @_MergedGlobals, i32 0, i32 0)
static const ConstantExpr *getMergedGlobalExpr(const Value *V) {
const ConstantExpr *CE = dyn_cast_or_null<ConstantExpr>(V);
if (!CE || CE->getNumOperands() != 3 ||
CE->getOpcode() != Instruction::GetElementPtr)
return nullptr;
// First operand points to a global struct.
Value *Ptr = CE->getOperand(0);
if (!isa<GlobalValue>(Ptr) ||
!isa<StructType>(cast<PointerType>(Ptr->getType())->getElementType()))
return nullptr;
// Second operand is zero.
const ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CE->getOperand(1));
if (!CI || !CI->isZero())
return nullptr;
// Third operand is offset.
if (!isa<ConstantInt>(CE->getOperand(2)))
return nullptr;
return CE;
}
/// getOrCreateGlobalVariableDIE - get or create global variable DIE.
DIE *DwarfCompileUnit::getOrCreateGlobalVariableDIE(DIGlobalVariable GV) {
// Check for pre-existence.
if (DIE *Die = getDIE(GV))
return Die;
assert(GV.isGlobalVariable());
DIScope GVContext = GV.getContext();
DIType GTy = DD->resolve(GV.getType());
// If this is a static data member definition, some attributes belong
// to the declaration DIE.
DIE *VariableDIE = nullptr;
bool IsStaticMember = false;
DIDerivedType SDMDecl = GV.getStaticDataMemberDeclaration();
if (SDMDecl.Verify()) {
assert(SDMDecl.isStaticMember() && "Expected static member decl");
// We need the declaration DIE that is in the static member's class.
VariableDIE = getOrCreateStaticMemberDIE(SDMDecl);
IsStaticMember = true;
}
// If this is not a static data member definition, create the variable
// DIE and add the initial set of attributes to it.
if (!VariableDIE) {
// Construct the context before querying for the existence of the DIE in
// case such construction creates the DIE.
DIE *ContextDIE = getOrCreateContextDIE(GVContext);
// Add to map.
VariableDIE = &createAndAddDIE(GV.getTag(), *ContextDIE, GV);
// Add name and type.
addString(*VariableDIE, dwarf::DW_AT_name, GV.getDisplayName());
addType(*VariableDIE, GTy);
// Add scoping info.
if (!GV.isLocalToUnit())
addFlag(*VariableDIE, dwarf::DW_AT_external);
// Add line number info.
addSourceLine(*VariableDIE, GV);
}
// Add location.
bool addToAccelTable = false;
DIE *VariableSpecDIE = nullptr;
bool isGlobalVariable = GV.getGlobal() != nullptr;
if (isGlobalVariable) {
addToAccelTable = true;
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
const MCSymbol *Sym = Asm->getSymbol(GV.getGlobal());
if (GV.getGlobal()->isThreadLocal()) {
// FIXME: Make this work with -gsplit-dwarf.
unsigned PointerSize = Asm->getDataLayout().getPointerSize();
assert((PointerSize == 4 || PointerSize == 8) &&
"Add support for other sizes if necessary");
// Based on GCC's support for TLS:
if (!DD->useSplitDwarf()) {
// 1) Start with a constNu of the appropriate pointer size
addUInt(*Loc, dwarf::DW_FORM_data1,
PointerSize == 4 ? dwarf::DW_OP_const4u : dwarf::DW_OP_const8u);
// 2) containing the (relocated) offset of the TLS variable
// within the module's TLS block.
addExpr(*Loc, dwarf::DW_FORM_udata,
Asm->getObjFileLowering().getDebugThreadLocalSymbol(Sym));
} else {
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_const_index);
addUInt(*Loc, dwarf::DW_FORM_udata,
DD->getAddressPool().getIndex(Sym, /* TLS */ true));
}
// 3) followed by a custom OP to make the debugger do a TLS lookup.
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_GNU_push_tls_address);
} else {
DD->addArangeLabel(SymbolCU(this, Sym));
addOpAddress(*Loc, Sym);
}
// A static member's declaration is already flagged as such.
if (!SDMDecl.Verify() && !GV.isDefinition())
addFlag(*VariableDIE, dwarf::DW_AT_declaration);
// Do not create specification DIE if context is either compile unit
// or a subprogram.
if (GVContext && GV.isDefinition() && !GVContext.isCompileUnit() &&
!GVContext.isFile() && !DD->isSubprogramContext(GVContext)) {
// Create specification DIE.
VariableSpecDIE = &createAndAddDIE(dwarf::DW_TAG_variable, UnitDie);
addDIEEntry(*VariableSpecDIE, dwarf::DW_AT_specification, *VariableDIE);
addBlock(*VariableSpecDIE, dwarf::DW_AT_location, Loc);
// A static member's declaration is already flagged as such.
if (!SDMDecl.Verify())
addFlag(*VariableDIE, dwarf::DW_AT_declaration);
} else {
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
}
// Add the linkage name.
StringRef LinkageName = GV.getLinkageName();
if (!LinkageName.empty())
// From DWARF4: DIEs to which DW_AT_linkage_name may apply include:
// TAG_common_block, TAG_constant, TAG_entry_point, TAG_subprogram and
// TAG_variable.
addString(IsStaticMember && VariableSpecDIE ? *VariableSpecDIE
: *VariableDIE,
DD->getDwarfVersion() >= 4 ? dwarf::DW_AT_linkage_name
: dwarf::DW_AT_MIPS_linkage_name,
GlobalValue::getRealLinkageName(LinkageName));
} else if (const ConstantInt *CI =
dyn_cast_or_null<ConstantInt>(GV.getConstant())) {
// AT_const_value was added when the static member was created. To avoid
// emitting AT_const_value multiple times, we only add AT_const_value when
// it is not a static member.
if (!IsStaticMember)
addConstantValue(*VariableDIE, CI, GTy);
} else if (const ConstantExpr *CE = getMergedGlobalExpr(GV.getConstant())) {
addToAccelTable = true;
// GV is a merged global.
DIELoc *Loc = new (DIEValueAllocator) DIELoc();
Value *Ptr = CE->getOperand(0);
MCSymbol *Sym = Asm->getSymbol(cast<GlobalValue>(Ptr));
DD->addArangeLabel(SymbolCU(this, Sym));
addOpAddress(*Loc, Sym);
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_constu);
SmallVector<Value *, 3> Idx(CE->op_begin() + 1, CE->op_end());
addUInt(*Loc, dwarf::DW_FORM_udata,
Asm->getDataLayout().getIndexedOffset(Ptr->getType(), Idx));
addUInt(*Loc, dwarf::DW_FORM_data1, dwarf::DW_OP_plus);
addBlock(*VariableDIE, dwarf::DW_AT_location, Loc);
}
DIE *ResultDIE = VariableSpecDIE ? VariableSpecDIE : VariableDIE;
if (addToAccelTable) {
DD->addAccelName(GV.getName(), *ResultDIE);
// If the linkage name is different than the name, go ahead and output
// that as well into the name table.
if (GV.getLinkageName() != "" && GV.getName() != GV.getLinkageName())
DD->addAccelName(GV.getLinkageName(), *ResultDIE);
}
addGlobalName(GV.getName(), *ResultDIE, GV.getContext());
return ResultDIE;
}
/// constructSubrangeDIE - Construct subrange DIE from DISubrange.
void DwarfUnit::constructSubrangeDIE(DIE &Buffer, DISubrange SR, DIE *IndexTy) {
DIE &DW_Subrange = createAndAddDIE(dwarf::DW_TAG_subrange_type, Buffer);
@ -2049,48 +1829,6 @@ void DwarfUnit::emitHeader(const MCSymbol *ASectionSym) const {
Asm->EmitInt8(Asm->getDataLayout().getPointerSize());
}
void DwarfCompileUnit::addRange(RangeSpan Range) {
bool SameAsPrevCU = this == DD->getPrevCU();
DD->setPrevCU(this);
// If we have no current ranges just add the range and return, otherwise,
// check the current section and CU against the previous section and CU we
// emitted into and the subprogram was contained within. If these are the
// same then extend our current range, otherwise add this as a new range.
if (CURanges.empty() || !SameAsPrevCU ||
(&CURanges.back().getEnd()->getSection() !=
&Range.getEnd()->getSection())) {
CURanges.push_back(Range);
return;
}
CURanges.back().setEnd(Range.getEnd());
}
void DwarfCompileUnit::initStmtList(MCSymbol *DwarfLineSectionSym) {
// Define start line table label for each Compile Unit.
MCSymbol *LineTableStartSym =
Asm->OutStreamer.getDwarfLineTableSymbol(getUniqueID());
stmtListIndex = UnitDie.getValues().size();
// DW_AT_stmt_list is a offset of line number information for this
// compile unit in debug_line section. For split dwarf this is
// left in the skeleton CU and so not included.
// The line table entries are not always emitted in assembly, so it
// is not okay to use line_table_start here.
if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
addSectionLabel(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym);
else
addSectionDelta(UnitDie, dwarf::DW_AT_stmt_list, LineTableStartSym,
DwarfLineSectionSym);
}
void DwarfCompileUnit::applyStmtList(DIE &D) {
D.addValue(dwarf::DW_AT_stmt_list,
UnitDie.getAbbrev().getData()[stmtListIndex].getForm(),
UnitDie.getValues()[stmtListIndex]);
}
void DwarfTypeUnit::emitHeader(const MCSymbol *ASectionSym) const {
DwarfUnit::emitHeader(ASectionSym);
Asm->OutStreamer.AddComment("Type Signature");

35
lib/CodeGen/AsmPrinter/DwarfUnit.h
View File

@ -522,41 +522,6 @@ private:
void updateAcceleratorTables(DIScope Context, DIType Ty, const DIE &TyDIE);
};
class DwarfCompileUnit : public DwarfUnit {
/// The attribute index of DW_AT_stmt_list in the compile unit DIE, avoiding
/// the need to search for it in applyStmtList.
unsigned stmtListIndex;
public:
DwarfCompileUnit(unsigned UID, DICompileUnit Node, AsmPrinter *A,
DwarfDebug *DW, DwarfFile *DWU);
void initStmtList(MCSymbol *DwarfLineSectionSym);
/// Apply the DW_AT_stmt_list from this compile unit to the specified DIE.
void applyStmtList(DIE &D);
/// getOrCreateGlobalVariableDIE - get or create global variable DIE.
DIE *getOrCreateGlobalVariableDIE(DIGlobalVariable GV);
/// addLabelAddress - Add a dwarf label attribute data and value using
/// either DW_FORM_addr or DW_FORM_GNU_addr_index.
void addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label);
/// addLocalLabelAddress - Add a dwarf label attribute data and value using
/// DW_FORM_addr only.
void addLocalLabelAddress(DIE &Die, dwarf::Attribute Attribute,
const MCSymbol *Label);
DwarfCompileUnit &getCU() override { return *this; }
unsigned getOrCreateSourceID(StringRef FileName, StringRef DirName) override;
/// addRange - Add an address range to the list of ranges for this unit.
void addRange(RangeSpan Range);
};
class DwarfTypeUnit : public DwarfUnit {
private:
uint64_t TypeSignature;