#include "llvm/MC/MCMachOSymbolFlags.h"
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCDwarf.h"
+#include "llvm/Support/Dwarf.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Target/TargetAsmBackend.h"
private:
void EmitInstToFragment(const MCInst &Inst);
void EmitInstToData(const MCInst &Inst);
- // FIXME: These will likely moved to a better place.
- const MCExpr * MakeStartMinusEndExpr(MCSymbol *Start, MCSymbol *End,
- int IntVal);
- void EmitDwarfFileTable(void);
public:
MCMachOStreamer(MCContext &Context, TargetAsmBackend &TAB,
raw_ostream &OS, MCCodeEmitter *Emitter)
- : MCObjectStreamer(Context, TAB, OS, Emitter) {}
+ : MCObjectStreamer(Context, TAB, OS, Emitter, true) {}
/// @name MCStreamer Interface
/// @{
+ virtual void InitSections();
virtual void EmitLabel(MCSymbol *Symbol);
virtual void EmitAssemblerFlag(MCAssemblerFlag Flag);
virtual void EmitAssignment(MCSymbol *Symbol, const MCExpr *Value);
} // end anonymous namespace.
+void MCMachOStreamer::InitSections() {
+ SwitchSection(getContext().getMachOSection("__TEXT", "__text",
+ MCSectionMachO::S_ATTR_PURE_INSTRUCTIONS,
+ 0, SectionKind::getText()));
+
+}
+
void MCMachOStreamer::EmitLabel(MCSymbol *Symbol) {
// TODO: This is almost exactly the same as WinCOFFStreamer. Consider merging
// into MCObjectStreamer.
case MCAF_SubsectionsViaSymbols:
getAssembler().setSubsectionsViaSymbols(true);
return;
+ default:
+ llvm_unreachable("invalid assembler flag!");
}
-
- assert(0 && "invalid assembler flag!");
}
void MCMachOStreamer::EmitAssignment(MCSymbol *Symbol, const MCExpr *Value) {
getCurrentSectionData()->setHasInstructions(true);
+ // Now that a machine instruction has been assembled into this section, make
+ // a line entry for any .loc directive that has been seen.
+ MCLineEntry::Make(this, getCurrentSection());
+
// If this instruction doesn't need relaxation, just emit it as data.
if (!getAssembler().getBackend().MayNeedRelaxation(Inst)) {
EmitInstToData(Inst);
EmitInstToFragment(Inst);
}
-//
-// This helper routine returns an expression of End - Start + IntVal for use
-// by EmitDwarfFileTable() below.
-//
-const MCExpr * MCMachOStreamer::MakeStartMinusEndExpr(MCSymbol *Start,
- MCSymbol *End,
- int IntVal) {
- MCSymbolRefExpr::VariantKind Variant = MCSymbolRefExpr::VK_None;
- const MCExpr *Res =
- MCSymbolRefExpr::Create(End, Variant, getContext());
- const MCExpr *RHS =
- MCSymbolRefExpr::Create(Start, Variant, getContext());
- const MCExpr *Res1 =
- MCBinaryExpr::Create(MCBinaryExpr::Sub, Res, RHS,getContext());
- const MCExpr *Res2 =
- MCConstantExpr::Create(IntVal, getContext());
- const MCExpr *Res3 =
- MCBinaryExpr::Create(MCBinaryExpr::Sub, Res1, Res2, getContext());
- return Res3;
-}
-
-//
-// This emits the Dwarf file (and eventually the line) table.
-//
-void MCMachOStreamer::EmitDwarfFileTable(void) {
- // For now make sure we don't put out the Dwarf file table if no .file
- // directives were seen.
- const std::vector<MCDwarfFile *> &MCDwarfFiles =
- getContext().getMCDwarfFiles();
- if (MCDwarfFiles.size() == 0)
- return;
-
- // This is the Mach-O section, for ELF it is the .debug_line section.
- SwitchSection(getContext().getMachOSection("__DWARF", "__debug_line",
+void MCMachOStreamer::Finish() {
+ // Dump out the dwarf file & directory tables and line tables.
+ if (getContext().hasDwarfFiles()) {
+ const MCSection *DwarfLineSection = getContext().getMachOSection("__DWARF",
+ "__debug_line",
MCSectionMachO::S_ATTR_DEBUG,
- 0, SectionKind::getDataRelLocal()));
-
- // Create a symbol at the beginning of this section.
- MCSymbol *LineStartSym = getContext().CreateTempSymbol();
- // Set the value of the symbol, as we are at the start of the section.
- EmitLabel(LineStartSym);
-
- // Create a symbol for the end of the section (to be set when we get there).
- MCSymbol *LineEndSym = getContext().CreateTempSymbol();
-
- // The first 4 bytes is the total length of the information for this
- // compilation unit (not including these 4 bytes for the length).
- EmitValue(MakeStartMinusEndExpr(LineStartSym, LineEndSym, 4), 4, 0);
-
- // Next 2 bytes is the Version, which is Dwarf 2.
- EmitIntValue(2, 2);
-
- // Create a symbol for the end of the prologue (to be set when we get there).
- MCSymbol *ProEndSym = getContext().CreateTempSymbol(); // Lprologue_end
-
- // Length of the prologue, is the next 4 bytes. Which is the start of the
- // 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.
- EmitValue(MakeStartMinusEndExpr(LineStartSym, ProEndSym, (4 + 2 + 4)), 4, 0);
-
- // Parameters of the state machine, are next.
- // Define the architecture-dependent minimum instruction length (in
- // bytes). This value should be rather too small than too big. */
- // DWARF2_LINE_MIN_INSN_LENGTH
- EmitIntValue(1, 1);
- // Flag that indicates the initial value of the is_stmt_start flag.
- // DWARF2_LINE_DEFAULT_IS_STMT
- EmitIntValue(1, 1);
- // Minimum line offset in a special line info. opcode. This value
- // was chosen to give a reasonable range of values. */
- // DWARF2_LINE_BASE
- EmitIntValue(-5, 1);
- // Range of line offsets in a special line info. opcode.
- // DWARF2_LINE_RANGE
- EmitIntValue(14, 1);
- // First special line opcode - leave room for the standard opcodes.
- // DWARF2_LINE_OPCODE_BASE
- EmitIntValue(13, 1);
-
- // Standard opcode lengths
- EmitIntValue(0, 1); // length of DW_LNS_copy
- EmitIntValue(1, 1); // length of DW_LNS_advance_pc
- EmitIntValue(1, 1); // length of DW_LNS_advance_line
- EmitIntValue(1, 1); // length of DW_LNS_set_file
- EmitIntValue(1, 1); // length of DW_LNS_set_column
- EmitIntValue(0, 1); // length of DW_LNS_negate_stmt
- EmitIntValue(0, 1); // length of DW_LNS_set_basic_block
- EmitIntValue(0, 1); // length of DW_LNS_const_add_pc
- EmitIntValue(1, 1); // length of DW_LNS_fixed_advance_pc
- EmitIntValue(0, 1); // length of DW_LNS_set_prologue_end
- EmitIntValue(0, 1); // length of DW_LNS_set_epilogue_begin
- EmitIntValue(1, 1); // DW_LNS_set_isa
-
- // Put out the directory and file tables.
-
- // First the directory table.
- const std::vector<StringRef> &MCDwarfDirs =
- getContext().getMCDwarfDirs();
- for (unsigned i = 0; i < MCDwarfDirs.size(); i++) {
- EmitBytes(MCDwarfDirs[i], 0); // the DirectoryName
- EmitBytes(StringRef("\0", 1), 0); // the null termination of the string
+ 0, SectionKind::getDataRelLocal());
+ MCDwarfFileTable::Emit(this, DwarfLineSection);
}
- EmitIntValue(0, 1); // Terminate the directory list
-
- // Second the file table.
- for (unsigned i = 1; i < MCDwarfFiles.size(); i++) {
- EmitBytes(MCDwarfFiles[i]->getName(), 0); // FileName
- EmitBytes(StringRef("\0", 1), 0); // the null termination of the string
- // FIXME the Directory number should be a .uleb128 not a .byte
- EmitIntValue(MCDwarfFiles[i]->getDirIndex(), 1);
- EmitIntValue(0, 1); // last modification timestamp (always 0)
- EmitIntValue(0, 1); // filesize (always 0)
- }
- EmitIntValue(0, 1); // Terminate the file list
-
- // This is the end of the prologue, so set the value of the symbol at the
- // end of the prologue (that was used in a previous expression).
- EmitLabel(ProEndSym);
-
- // TODO: This is the point where the line tables would be emitted.
-
- // If there are no line tables emited then we emit:
- // The following DW_LNE_set_address sequence to set the address to zero
- // TODO test for 32-bit or 64-bit output
- // This is the sequence for 32-bit code
- EmitIntValue(0, 1);
- EmitIntValue(5, 1);
- EmitIntValue(2, 1);
- EmitIntValue(0, 1);
- EmitIntValue(0, 1);
- EmitIntValue(0, 1);
- EmitIntValue(0, 1);
-
- // 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).
- EmitIntValue(0, 1); // DW_LNS_extended_op
- EmitIntValue(1, 1); // ULEB128 length of the extended opcode
- EmitIntValue(1, 1); // DW_LNE_end_sequence
-
- // 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).
- EmitLabel(LineEndSym);
-}
-
-void MCMachOStreamer::Finish() {
- // Dump out the dwarf file and directory tables (soon to include line table)
- EmitDwarfFileTable();
// We have to set the fragment atom associations so we can relax properly for
// Mach-O.
projects / oota-llvm.git / blobdiff