llvm-6502/lib/CodeGen/AsmPrinter/DIE.cpp
Rafael Espindola 33966cf988 Make AsmPrinter::EmitLabelOffsetDifference a static helper and simplify.
It had exactly one caller in a position where we know hasSetDirective is true.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220250 91177308-0d34-0410-b5e6-96231b3b80d8
2014-10-21 00:25:49 +00:00

594 lines
19 KiB
C++

//===--- lib/CodeGen/DIE.cpp - DWARF Info Entries -------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// Data structures for DWARF info entries.
//
//===----------------------------------------------------------------------===//
#include "DIE.h"
#include "DwarfCompileUnit.h"
#include "DwarfDebug.h"
#include "DwarfUnit.h"
#include "llvm/ADT/Twine.h"
#include "llvm/CodeGen/AsmPrinter.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/FormattedStream.h"
#include "llvm/Support/LEB128.h"
#include "llvm/Support/MD5.h"
using namespace llvm;
//===----------------------------------------------------------------------===//
// DIEAbbrevData Implementation
//===----------------------------------------------------------------------===//
/// Profile - Used to gather unique data for the abbreviation folding set.
///
void DIEAbbrevData::Profile(FoldingSetNodeID &ID) const {
// Explicitly cast to an integer type for which FoldingSetNodeID has
// overloads. Otherwise MSVC 2010 thinks this call is ambiguous.
ID.AddInteger(unsigned(Attribute));
ID.AddInteger(unsigned(Form));
}
//===----------------------------------------------------------------------===//
// DIEAbbrev Implementation
//===----------------------------------------------------------------------===//
/// Profile - Used to gather unique data for the abbreviation folding set.
///
void DIEAbbrev::Profile(FoldingSetNodeID &ID) const {
ID.AddInteger(unsigned(Tag));
ID.AddInteger(unsigned(Children));
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i)
Data[i].Profile(ID);
}
/// Emit - Print the abbreviation using the specified asm printer.
///
void DIEAbbrev::Emit(AsmPrinter *AP) const {
// Emit its Dwarf tag type.
AP->EmitULEB128(Tag, dwarf::TagString(Tag));
// Emit whether it has children DIEs.
AP->EmitULEB128((unsigned)Children, dwarf::ChildrenString(Children));
// For each attribute description.
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
const DIEAbbrevData &AttrData = Data[i];
// Emit attribute type.
AP->EmitULEB128(AttrData.getAttribute(),
dwarf::AttributeString(AttrData.getAttribute()));
// Emit form type.
AP->EmitULEB128(AttrData.getForm(),
dwarf::FormEncodingString(AttrData.getForm()));
}
// Mark end of abbreviation.
AP->EmitULEB128(0, "EOM(1)");
AP->EmitULEB128(0, "EOM(2)");
}
#ifndef NDEBUG
void DIEAbbrev::print(raw_ostream &O) {
O << "Abbreviation @"
<< format("0x%lx", (long)(intptr_t)this)
<< " "
<< dwarf::TagString(Tag)
<< " "
<< dwarf::ChildrenString(Children)
<< '\n';
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
O << " "
<< dwarf::AttributeString(Data[i].getAttribute())
<< " "
<< dwarf::FormEncodingString(Data[i].getForm())
<< '\n';
}
}
void DIEAbbrev::dump() { print(dbgs()); }
#endif
/// Climb up the parent chain to get the unit DIE to which this DIE
/// belongs.
const DIE *DIE::getUnit() const {
const DIE *Cu = getUnitOrNull();
assert(Cu && "We should not have orphaned DIEs.");
return Cu;
}
/// Climb up the parent chain to get the unit DIE this DIE belongs
/// to. Return NULL if DIE is not added to an owner yet.
const DIE *DIE::getUnitOrNull() const {
const DIE *p = this;
while (p) {
if (p->getTag() == dwarf::DW_TAG_compile_unit ||
p->getTag() == dwarf::DW_TAG_type_unit)
return p;
p = p->getParent();
}
return nullptr;
}
DIEValue *DIE::findAttribute(dwarf::Attribute Attribute) const {
const SmallVectorImpl<DIEValue *> &Values = getValues();
const DIEAbbrev &Abbrevs = getAbbrev();
// Iterate through all the attributes until we find the one we're
// looking for, if we can't find it return NULL.
for (size_t i = 0; i < Values.size(); ++i)
if (Abbrevs.getData()[i].getAttribute() == Attribute)
return Values[i];
return nullptr;
}
#ifndef NDEBUG
void DIE::print(raw_ostream &O, unsigned IndentCount) const {
const std::string Indent(IndentCount, ' ');
bool isBlock = Abbrev.getTag() == 0;
if (!isBlock) {
O << Indent
<< "Die: "
<< format("0x%lx", (long)(intptr_t)this)
<< ", Offset: " << Offset
<< ", Size: " << Size << "\n";
O << Indent
<< dwarf::TagString(Abbrev.getTag())
<< " "
<< dwarf::ChildrenString(Abbrev.hasChildren()) << "\n";
} else {
O << "Size: " << Size << "\n";
}
const SmallVectorImpl<DIEAbbrevData> &Data = Abbrev.getData();
IndentCount += 2;
for (unsigned i = 0, N = Data.size(); i < N; ++i) {
O << Indent;
if (!isBlock)
O << dwarf::AttributeString(Data[i].getAttribute());
else
O << "Blk[" << i << "]";
O << " "
<< dwarf::FormEncodingString(Data[i].getForm())
<< " ";
Values[i]->print(O);
O << "\n";
}
IndentCount -= 2;
for (unsigned j = 0, M = Children.size(); j < M; ++j) {
Children[j]->print(O, IndentCount+4);
}
if (!isBlock) O << "\n";
}
void DIE::dump() {
print(dbgs());
}
#endif
void DIEValue::anchor() { }
#ifndef NDEBUG
void DIEValue::dump() const {
print(dbgs());
}
#endif
//===----------------------------------------------------------------------===//
// DIEInteger Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit integer of appropriate size.
///
void DIEInteger::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
unsigned Size = ~0U;
switch (Form) {
case dwarf::DW_FORM_flag_present:
// Emit something to keep the lines and comments in sync.
// FIXME: Is there a better way to do this?
Asm->OutStreamer.AddBlankLine();
return;
case dwarf::DW_FORM_flag: // Fall thru
case dwarf::DW_FORM_ref1: // Fall thru
case dwarf::DW_FORM_data1: Size = 1; break;
case dwarf::DW_FORM_ref2: // Fall thru
case dwarf::DW_FORM_data2: Size = 2; break;
case dwarf::DW_FORM_sec_offset: // Fall thru
case dwarf::DW_FORM_ref4: // Fall thru
case dwarf::DW_FORM_data4: Size = 4; break;
case dwarf::DW_FORM_ref8: // Fall thru
case dwarf::DW_FORM_ref_sig8: // Fall thru
case dwarf::DW_FORM_data8: Size = 8; break;
case dwarf::DW_FORM_GNU_str_index: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_GNU_addr_index: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_udata: Asm->EmitULEB128(Integer); return;
case dwarf::DW_FORM_sdata: Asm->EmitSLEB128(Integer); return;
case dwarf::DW_FORM_addr:
Size = Asm->getDataLayout().getPointerSize(); break;
default: llvm_unreachable("DIE Value form not supported yet");
}
Asm->OutStreamer.EmitIntValue(Integer, Size);
}
/// SizeOf - Determine size of integer value in bytes.
///
unsigned DIEInteger::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_flag_present: return 0;
case dwarf::DW_FORM_flag: // Fall thru
case dwarf::DW_FORM_ref1: // Fall thru
case dwarf::DW_FORM_data1: return sizeof(int8_t);
case dwarf::DW_FORM_ref2: // Fall thru
case dwarf::DW_FORM_data2: return sizeof(int16_t);
case dwarf::DW_FORM_sec_offset: // Fall thru
case dwarf::DW_FORM_ref4: // Fall thru
case dwarf::DW_FORM_data4: return sizeof(int32_t);
case dwarf::DW_FORM_ref8: // Fall thru
case dwarf::DW_FORM_ref_sig8: // Fall thru
case dwarf::DW_FORM_data8: return sizeof(int64_t);
case dwarf::DW_FORM_GNU_str_index: return getULEB128Size(Integer);
case dwarf::DW_FORM_GNU_addr_index: return getULEB128Size(Integer);
case dwarf::DW_FORM_udata: return getULEB128Size(Integer);
case dwarf::DW_FORM_sdata: return getSLEB128Size(Integer);
case dwarf::DW_FORM_addr: return AP->getDataLayout().getPointerSize();
default: llvm_unreachable("DIE Value form not supported yet");
}
}
#ifndef NDEBUG
void DIEInteger::print(raw_ostream &O) const {
O << "Int: " << (int64_t)Integer << " 0x";
O.write_hex(Integer);
}
#endif
//===----------------------------------------------------------------------===//
// DIEExpr Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit expression value.
///
void DIEExpr::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
AP->OutStreamer.EmitValue(Expr, SizeOf(AP, Form));
}
/// SizeOf - Determine size of expression value in bytes.
///
unsigned DIEExpr::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4) return 4;
if (Form == dwarf::DW_FORM_sec_offset) return 4;
if (Form == dwarf::DW_FORM_strp) return 4;
return AP->getDataLayout().getPointerSize();
}
#ifndef NDEBUG
void DIEExpr::print(raw_ostream &O) const {
O << "Expr: ";
Expr->print(O);
}
#endif
//===----------------------------------------------------------------------===//
// DIELabel Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit label value.
///
void DIELabel::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
AP->EmitLabelReference(Label, SizeOf(AP, Form),
Form == dwarf::DW_FORM_strp ||
Form == dwarf::DW_FORM_sec_offset ||
Form == dwarf::DW_FORM_ref_addr);
}
/// SizeOf - Determine size of label value in bytes.
///
unsigned DIELabel::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4) return 4;
if (Form == dwarf::DW_FORM_sec_offset) return 4;
if (Form == dwarf::DW_FORM_strp) return 4;
return AP->getDataLayout().getPointerSize();
}
#ifndef NDEBUG
void DIELabel::print(raw_ostream &O) const {
O << "Lbl: " << Label->getName();
}
#endif
//===----------------------------------------------------------------------===//
// DIEDelta Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit delta value.
///
void DIEDelta::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
AP->EmitLabelDifference(LabelHi, LabelLo, SizeOf(AP, Form));
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEDelta::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4) return 4;
if (Form == dwarf::DW_FORM_sec_offset) return 4;
if (Form == dwarf::DW_FORM_strp) return 4;
return AP->getDataLayout().getPointerSize();
}
#ifndef NDEBUG
void DIEDelta::print(raw_ostream &O) const {
O << "Del: " << LabelHi->getName() << "-" << LabelLo->getName();
}
#endif
//===----------------------------------------------------------------------===//
// DIEString Implementation
//===----------------------------------------------------------------------===//
/// EmitValue - Emit string value.
///
void DIEString::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
Access->EmitValue(AP, Form);
}
/// SizeOf - Determine size of delta value in bytes.
///
unsigned DIEString::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
return Access->SizeOf(AP, Form);
}
#ifndef NDEBUG
void DIEString::print(raw_ostream &O) const {
O << "String: " << Str << "\tSymbol: ";
Access->print(O);
}
#endif
//===----------------------------------------------------------------------===//
// DIEEntry Implementation
//===----------------------------------------------------------------------===//
/// Emit something like ".long Hi+Offset-Lo" where the size in bytes of the
/// directive is specified by Size and Hi/Lo specify the labels.
static void emitLabelOffsetDifference(MCStreamer &Streamer, const MCSymbol *Hi,
uint64_t Offset, const MCSymbol *Lo,
unsigned Size) {
MCContext &Context = Streamer.getContext();
// Emit Hi+Offset - Lo
// Get the Hi+Offset expression.
const MCExpr *Plus =
MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Hi, Context),
MCConstantExpr::Create(Offset, Context), Context);
// Get the Hi+Offset-Lo expression.
const MCExpr *Diff = MCBinaryExpr::CreateSub(
Plus, MCSymbolRefExpr::Create(Lo, Context), Context);
// Otherwise, emit with .set (aka assignment).
MCSymbol *SetLabel = Context.CreateTempSymbol();
Streamer.EmitAssignment(SetLabel, Diff);
Streamer.EmitSymbolValue(SetLabel, Size);
}
/// EmitValue - Emit debug information entry offset.
///
void DIEEntry::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_ref_addr) {
const DwarfDebug *DD = AP->getDwarfDebug();
unsigned Addr = Entry.getOffset();
assert(!DD->useSplitDwarf() && "TODO: dwo files can't have relocations.");
// For DW_FORM_ref_addr, output the offset from beginning of debug info
// section. Entry->getOffset() returns the offset from start of the
// compile unit.
DwarfCompileUnit *CU = DD->lookupUnit(Entry.getUnit());
assert(CU && "CUDie should belong to a CU.");
Addr += CU->getDebugInfoOffset();
if (AP->MAI->doesDwarfUseRelocationsAcrossSections())
AP->EmitLabelPlusOffset(CU->getSectionSym(), Addr,
DIEEntry::getRefAddrSize(AP));
else
emitLabelOffsetDifference(AP->OutStreamer, CU->getSectionSym(), Addr,
CU->getSectionSym(),
DIEEntry::getRefAddrSize(AP));
} else
AP->EmitInt32(Entry.getOffset());
}
unsigned DIEEntry::getRefAddrSize(AsmPrinter *AP) {
// DWARF4: References that use the attribute form DW_FORM_ref_addr are
// specified to be four bytes in the DWARF 32-bit format and eight bytes
// in the DWARF 64-bit format, while DWARF Version 2 specifies that such
// references have the same size as an address on the target system.
const DwarfDebug *DD = AP->getDwarfDebug();
assert(DD && "Expected Dwarf Debug info to be available");
if (DD->getDwarfVersion() == 2)
return AP->getDataLayout().getPointerSize();
return sizeof(int32_t);
}
#ifndef NDEBUG
void DIEEntry::print(raw_ostream &O) const {
O << format("Die: 0x%lx", (long)(intptr_t)&Entry);
}
#endif
//===----------------------------------------------------------------------===//
// DIETypeSignature Implementation
//===----------------------------------------------------------------------===//
void DIETypeSignature::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
assert(Form == dwarf::DW_FORM_ref_sig8);
Asm->OutStreamer.EmitIntValue(Unit.getTypeSignature(), 8);
}
#ifndef NDEBUG
void DIETypeSignature::print(raw_ostream &O) const {
O << format("Type Unit: 0x%lx", Unit.getTypeSignature());
}
void DIETypeSignature::dump() const { print(dbgs()); }
#endif
//===----------------------------------------------------------------------===//
// DIELoc Implementation
//===----------------------------------------------------------------------===//
/// ComputeSize - calculate the size of the location expression.
///
unsigned DIELoc::ComputeSize(AsmPrinter *AP) const {
if (!Size) {
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i)
Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
}
return Size;
}
/// EmitValue - Emit location data.
///
void DIELoc::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
switch (Form) {
default: llvm_unreachable("Improper form for block");
case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
case dwarf::DW_FORM_block:
case dwarf::DW_FORM_exprloc:
Asm->EmitULEB128(Size); break;
}
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i)
Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
}
/// SizeOf - Determine size of location data in bytes.
///
unsigned DIELoc::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
case dwarf::DW_FORM_block:
case dwarf::DW_FORM_exprloc:
return Size + getULEB128Size(Size);
default: llvm_unreachable("Improper form for block");
}
}
#ifndef NDEBUG
void DIELoc::print(raw_ostream &O) const {
O << "ExprLoc: ";
DIE::print(O, 5);
}
#endif
//===----------------------------------------------------------------------===//
// DIEBlock Implementation
//===----------------------------------------------------------------------===//
/// ComputeSize - calculate the size of the block.
///
unsigned DIEBlock::ComputeSize(AsmPrinter *AP) const {
if (!Size) {
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i)
Size += Values[i]->SizeOf(AP, AbbrevData[i].getForm());
}
return Size;
}
/// EmitValue - Emit block data.
///
void DIEBlock::EmitValue(AsmPrinter *Asm, dwarf::Form Form) const {
switch (Form) {
default: llvm_unreachable("Improper form for block");
case dwarf::DW_FORM_block1: Asm->EmitInt8(Size); break;
case dwarf::DW_FORM_block2: Asm->EmitInt16(Size); break;
case dwarf::DW_FORM_block4: Asm->EmitInt32(Size); break;
case dwarf::DW_FORM_block: Asm->EmitULEB128(Size); break;
}
const SmallVectorImpl<DIEAbbrevData> &AbbrevData = Abbrev.getData();
for (unsigned i = 0, N = Values.size(); i < N; ++i)
Values[i]->EmitValue(Asm, AbbrevData[i].getForm());
}
/// SizeOf - Determine size of block data in bytes.
///
unsigned DIEBlock::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
switch (Form) {
case dwarf::DW_FORM_block1: return Size + sizeof(int8_t);
case dwarf::DW_FORM_block2: return Size + sizeof(int16_t);
case dwarf::DW_FORM_block4: return Size + sizeof(int32_t);
case dwarf::DW_FORM_block: return Size + getULEB128Size(Size);
default: llvm_unreachable("Improper form for block");
}
}
#ifndef NDEBUG
void DIEBlock::print(raw_ostream &O) const {
O << "Blk: ";
DIE::print(O, 5);
}
#endif
//===----------------------------------------------------------------------===//
// DIELocList Implementation
//===----------------------------------------------------------------------===//
unsigned DIELocList::SizeOf(AsmPrinter *AP, dwarf::Form Form) const {
if (Form == dwarf::DW_FORM_data4)
return 4;
if (Form == dwarf::DW_FORM_sec_offset)
return 4;
return AP->getDataLayout().getPointerSize();
}
/// EmitValue - Emit label value.
///
void DIELocList::EmitValue(AsmPrinter *AP, dwarf::Form Form) const {
DwarfDebug *DD = AP->getDwarfDebug();
MCSymbol *Label = DD->getDebugLocEntries()[Index].Label;
if (AP->MAI->doesDwarfUseRelocationsAcrossSections() && !DD->useSplitDwarf())
AP->EmitSectionOffset(Label, DD->getDebugLocSym());
else
AP->EmitLabelDifference(Label, DD->getDebugLocSym(), 4);
}
#ifndef NDEBUG
void DIELocList::print(raw_ostream &O) const {
O << "LocList: " << Index;
}
#endif