#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCContext.h"
// and if there is information from the last .loc directive that has yet to have
// a line entry made for it is made.
//
-void MCLineEntry::Make(MCObjectStreamer *MCOS, const MCSection *Section) {
+void MCLineEntry::Make(MCStreamer *MCOS, const MCSection *Section) {
if (!MCOS->getContext().getDwarfLocSeen())
return;
// Get the MCLineSection for this section, if one does not exist for this
// section create it.
- DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
+ const DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
MCOS->getContext().getMCLineSections();
- MCLineSection *LineSection = MCLineSections[Section];
+ MCLineSection *LineSection = MCLineSections.lookup(Section);
if (!LineSection) {
// Create a new MCLineSection. This will be deleted after the dwarf line
// table is created using it by iterating through the MCLineSections
// DenseMap.
LineSection = new MCLineSection;
// Save a pointer to the new LineSection into the MCLineSections DenseMap.
- MCLineSections[Section] = LineSection;
+ MCOS->getContext().addMCLineSection(Section, LineSection);
}
// Add the line entry to this section's entries.
//
// This helper routine returns an expression of End - Start + IntVal .
//
-static inline const MCExpr *MakeStartMinusEndExpr(MCObjectStreamer *MCOS,
+static inline const MCExpr *MakeStartMinusEndExpr(MCStreamer *MCOS,
MCSymbol *Start,
MCSymbol *End, int IntVal) {
MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
return Res3;
}
-//
-// This emits an "absolute" address used in the start of a dwarf line number
-// table. This will result in a relocatation entry for the address.
-//
-static inline void EmitDwarfSetAddress(MCObjectStreamer *MCOS,
- MCSymbol *Symbol) {
- MCOS->EmitIntValue(dwarf::DW_LNS_extended_op, 1);
-
- int sizeof_address = MCOS->getAssembler().getBackend().getPointerSize();
- MCOS->EmitULEB128IntValue(sizeof_address + 1);
-
- MCOS->EmitIntValue(dwarf::DW_LNE_set_address, 1);
- MCOS->EmitSymbolValue(Symbol, sizeof_address);
-}
-
//
// This emits the Dwarf line table for the specified section from the entries
// in the LineSection.
//
-static inline bool EmitDwarfLineTable(MCObjectStreamer *MCOS,
+static inline void EmitDwarfLineTable(MCStreamer *MCOS,
const MCSection *Section,
- MCLineSection *LineSection,
+ const MCLineSection *LineSection,
const MCSection *DwarfLineSection) {
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Column = 0;
unsigned Flags = DWARF2_LINE_DEFAULT_IS_STMT ? DWARF2_FLAG_IS_STMT : 0;
unsigned Isa = 0;
- bool EmittedLineTable = false;
MCSymbol *LastLabel = NULL;
- MCSectionData &DLS =
- MCOS->getAssembler().getOrCreateSectionData(*DwarfLineSection);
// Loop through each MCLineEntry and encode the dwarf line number table.
- for (MCLineSection::iterator
+ for (MCLineSection::const_iterator
it = LineSection->getMCLineEntries()->begin(),
ie = LineSection->getMCLineEntries()->end(); it != ie; ++it) {
if (it->getFlags() & DWARF2_FLAG_EPILOGUE_BEGIN)
MCOS->EmitIntValue(dwarf::DW_LNS_set_epilogue_begin, 1);
- int64_t LineDelta = it->getLine() - LastLine;
+ int64_t LineDelta = static_cast<int64_t>(it->getLine()) - LastLine;
MCSymbol *Label = it->getLabel();
// At this point we want to emit/create the sequence to encode the delta in
// line numbers and the increment of the address from the previous Label
// and the current Label.
- if (LastLabel == NULL) {
- // emit the sequence to set the address
- EmitDwarfSetAddress(MCOS, Label);
- // emit the sequence for the LineDelta (from 1) and a zero address delta.
- MCDwarfLineAddr::Emit(MCOS, LineDelta, 0);
- }
- else {
- // Create an expression for the address delta from the LastLabel and
- // this Label (plus 0).
- const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, Label,0);
- // Create a Dwarf Line fragment for the LineDelta and AddrDelta.
- new MCDwarfLineAddrFragment(LineDelta, *AddrDelta, &DLS);
- }
+ MCOS->EmitDwarfAdvanceLineAddr(LineDelta, LastLabel, Label);
LastLine = it->getLine();
LastLabel = Label;
- EmittedLineTable = true;
}
// Emit a DW_LNE_end_sequence for the end of the section.
// Switch back the the dwarf line section.
MCOS->SwitchSection(DwarfLineSection);
- // Create an expression for the address delta from the LastLabel and this
- // SectionEnd label.
- const MCExpr *AddrDelta = MakeStartMinusEndExpr(MCOS, LastLabel, SectionEnd,
- 0);
- // Create a Dwarf Line fragment for the LineDelta and AddrDelta.
- new MCDwarfLineAddrFragment(INT64_MAX, *AddrDelta, &DLS);
-
- return EmittedLineTable;
+
+ MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd);
}
//
// This emits the Dwarf file and the line tables.
//
-void MCDwarfFileTable::Emit(MCObjectStreamer *MCOS,
- const MCSection *DwarfLineSection) {
+void MCDwarfFileTable::Emit(MCStreamer *MCOS,
+ const MCSection *DwarfLineSection,
+ const MCSection *TextSection) {
// Switch to the section where the table will be emitted into.
MCOS->SwitchSection(DwarfLineSection);
// The first 4 bytes is the total length of the information for this
// compilation unit (not including these 4 bytes for the length).
MCOS->EmitValue(MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym, 4),
- 4, 0);
+ 4, 0, true /*UseSet*/);
// Next 2 bytes is the Version, which is Dwarf 2.
MCOS->EmitIntValue(2, 2);
// length of the prologue.
MCOS->EmitValue(MakeStartMinusEndExpr(MCOS, LineStartSym, ProEndSym,
(4 + 2 + 4)),
- 4, 0);
+ 4, 0, true /*UseSet*/);
// Parameters of the state machine, are next.
MCOS->EmitIntValue(DWARF2_LINE_MIN_INSN_LENGTH, 1);
MCOS->EmitLabel(ProEndSym);
// Put out the line tables.
- bool EmittedLineTable = false;
- DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
+ const DenseMap<const MCSection *, MCLineSection *> &MCLineSections =
MCOS->getContext().getMCLineSections();
- for (DenseMap<const MCSection *, MCLineSection *>::iterator it =
- MCLineSections.begin(), ie = MCLineSections.end(); it != ie; ++it) {
- EmittedLineTable = EmitDwarfLineTable(MCOS, it->first, it->second,
- DwarfLineSection);
+ const std::vector<const MCSection *> &MCLineSectionOrder =
+ MCOS->getContext().getMCLineSectionOrder();
+ for (std::vector<const MCSection*>::const_iterator it =
+ MCLineSectionOrder.begin(), ie = MCLineSectionOrder.end(); it != ie;
+ ++it) {
+ const MCSection *Sec = *it;
+ const MCLineSection *Line = MCLineSections.lookup(Sec);
+ EmitDwarfLineTable(MCOS, Sec, Line, DwarfLineSection);
// Now delete the MCLineSections that were created in MCLineEntry::Make()
// and used to emit the line table.
- delete it->second;
+ delete Line;
}
- // If there are no line tables emited then we emit:
- // The following DW_LNE_set_address sequence to set the address to zero and
- // the DW_LNE_end_sequence.
- if (EmittedLineTable == false) {
- if (MCOS->getAssembler().getBackend().getPointerSize() == 8) {
- // This is the DW_LNE_set_address sequence for 64-bit code.
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(9, 1);
- MCOS->EmitIntValue(2, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- }
- else {
- // This is the DW_LNE_set_address sequence for 32-bit code.
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(5, 1);
- MCOS->EmitIntValue(2, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- MCOS->EmitIntValue(0, 1);
- }
+ if (TextSection && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) {
+ // Emit dummy entry if line table is empty.
+
+ MCOS->SwitchSection(TextSection);
+ MCSymbol *SectionEnd = MCOS->getContext().CreateTempSymbol();
+ // Set the value of the symbol, as we are at the end of the section.
+ MCOS->EmitLabel(SectionEnd);
+
+ // Switch back the the dwarf line section.
+ MCOS->SwitchSection(DwarfLineSection);
- // Lastly emit the DW_LNE_end_sequence which consists of 3 bytes '00 01 01'
- // (00 is the code for extended opcodes, followed by a ULEB128 length of the
- // extended opcode (01), and the DW_LNE_end_sequence (01).
- MCOS->EmitIntValue(0, 1); // DW_LNS_extended_op
- MCOS->EmitIntValue(1, 1); // ULEB128 length of the extended opcode
- MCOS->EmitIntValue(1, 1); // DW_LNE_end_sequence
+ MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, NULL, SectionEnd);
}
// This is the end of the section, so set the value of the symbol at the end
}
/// Utility function to emit the encoding to a streamer.
-void MCDwarfLineAddr::Emit(MCObjectStreamer *MCOS, int64_t LineDelta,
+void MCDwarfLineAddr::Emit(MCStreamer *MCOS, int64_t LineDelta,
uint64_t AddrDelta) {
SmallString<256> Tmp;
raw_svector_ostream OS(Tmp);
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