//
//===----------------------------------------------------------------------===//
+#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCDwarf.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCStreamer.h"
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(MCStreamer *MCOS,
- MCSymbol *Symbol,
- int PointerSize) {
- MCOS->EmitIntValue(dwarf::DW_LNS_extended_op, 1);
-
- MCOS->EmitULEB128IntValue(PointerSize + 1);
-
- MCOS->EmitIntValue(dwarf::DW_LNE_set_address, 1);
- MCOS->EmitSymbolValue(Symbol, PointerSize);
-}
-
//
// This emits the Dwarf line table for the specified section from the entries
// in the LineSection.
static inline void EmitDwarfLineTable(MCStreamer *MCOS,
const MCSection *Section,
const MCLineSection *LineSection,
- const MCSection *DwarfLineSection,
- MCSectionData *DLS,
- int PointerSize) {
+ const MCSection *DwarfLineSection) {
unsigned FileNum = 1;
unsigned LastLine = 1;
unsigned Column = 0;
// 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 || DLS == NULL) {
- // emit the sequence to set the address
- EmitDwarfSetAddress(MCOS, Label, PointerSize);
- // 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;
// Switch back the the dwarf line section.
MCOS->SwitchSection(DwarfLineSection);
- if (DLS == NULL) {
- // emit the sequence to set the address
- EmitDwarfSetAddress(MCOS, SectionEnd, PointerSize);
- // emit the sequence for the LineDelta (from 1) and a zero address delta.
- MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
- } else {
- // 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);
- }
+ MCOS->EmitDwarfAdvanceLineAddr(INT64_MAX, LastLabel, SectionEnd);
}
//
// This emits the Dwarf file and the line tables.
//
void MCDwarfFileTable::Emit(MCStreamer *MCOS,
- const MCSection *DwarfLineSection,
- MCSectionData *DLS,
- int PointerSize) {
+ const MCSection *DwarfLineSection) {
// 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);
+ MCOS->EmitAbsValue(MakeStartMinusEndExpr(MCOS, LineStartSym, LineEndSym,4),
+ 4);
// Next 2 bytes is the Version, which is Dwarf 2.
MCOS->EmitIntValue(2, 2);
// section to the end of the prologue. Not including the 4 bytes for the
// total length, the 2 bytes for the version, and these 4 bytes for the
// length of the prologue.
- MCOS->EmitValue(MakeStartMinusEndExpr(MCOS, LineStartSym, ProEndSym,
+ MCOS->EmitAbsValue(MakeStartMinusEndExpr(MCOS, LineStartSym, ProEndSym,
(4 + 2 + 4)),
4, 0);
++it) {
const MCSection *Sec = *it;
const MCLineSection *Line = MCLineSections.lookup(Sec);
- EmitDwarfLineTable(MCOS, Sec, Line, DwarfLineSection, DLS,
- PointerSize);
+ EmitDwarfLineTable(MCOS, Sec, Line, DwarfLineSection);
// Now delete the MCLineSections that were created in MCLineEntry::Make()
// and used to emit the line table.
delete Line;
}
+ if (MCOS->getContext().getAsmInfo().getLinkerRequiresNonEmptyDwarfLines()
+ && MCLineSectionOrder.begin() == MCLineSectionOrder.end()) {
+ // The darwin9 linker has a bug (see PR8715). For for 32-bit architectures
+ // it requires:
+ // total_length >= prologue_length + 10
+ // We are 4 bytes short, since we have total_length = 51 and
+ // prologue_length = 45
+
+ // The regular end_sequence should be sufficient.
+ MCDwarfLineAddr::Emit(MCOS, INT64_MAX, 0);
+ }
+
// This is the end of the section, so set the value of the symbol at the end
// of this section (that was used in a previous expression).
MCOS->EmitLabel(LineEndSym);
}
-/// Utility function to compute the size of the encoding.
-uint64_t MCDwarfLineAddr::ComputeSize(int64_t LineDelta, uint64_t AddrDelta) {
- SmallString<256> Tmp;
- raw_svector_ostream OS(Tmp);
- MCDwarfLineAddr::Encode(LineDelta, AddrDelta, OS);
- return OS.GetNumBytesInBuffer();
-}
-
/// Utility function to write the encoding to an object writer.
void MCDwarfLineAddr::Write(MCObjectWriter *OW, int64_t LineDelta,
uint64_t AddrDelta) {
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