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+//===- MCDwarf.h - Machine Code Dwarf support -------------------*- 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 the declaration of the MCDwarfFile to support the dwarf
+// .file directive and the .loc directive.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCDWARF_H
+#define LLVM_MC_MCDWARF_H
+
+#include "llvm/ADT/MapVector.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/MC/MCSection.h"
+#include "llvm/Support/Error.h"
+#include "llvm/Support/MD5.h"
+#include <cassert>
+#include <cstdint>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace llvm {
+
+template <typename T> class ArrayRef;
+class MCAsmBackend;
+class MCContext;
+class MCDwarfLineStr;
+class MCObjectStreamer;
+class MCStreamer;
+class MCSymbol;
+class raw_ostream;
+class SMLoc;
+class SourceMgr;
+
+/// \brief Instances of this class represent the name of the dwarf
+/// .file directive and its associated dwarf file number in the MC file,
+/// and MCDwarfFile's are created and uniqued by the MCContext class where
+/// the file number for each is its index into the vector of DwarfFiles (note
+/// index 0 is not used and not a valid dwarf file number).
+struct MCDwarfFile {
+ // \brief The base name of the file without its directory path.
+ std::string Name;
+
+ // \brief The index into the list of directory names for this file name.
+ unsigned DirIndex;
+
+ /// The MD5 checksum, if there is one. Non-owning pointer to data allocated
+ /// in MCContext.
+ MD5::MD5Result *Checksum = nullptr;
+
+ /// The source code of the file. Non-owning reference to data allocated in
+ /// MCContext.
+ Optional<StringRef> Source;
+};
+
+/// \brief Instances of this class represent the information from a
+/// dwarf .loc directive.
+class MCDwarfLoc {
+ uint32_t FileNum;
+ uint32_t Line;
+ uint16_t Column;
+ // Flags (see #define's below)
+ uint8_t Flags;
+ uint8_t Isa;
+ uint32_t Discriminator;
+
+// Flag that indicates the initial value of the is_stmt_start flag.
+#define DWARF2_LINE_DEFAULT_IS_STMT 1
+
+#define DWARF2_FLAG_IS_STMT (1 << 0)
+#define DWARF2_FLAG_BASIC_BLOCK (1 << 1)
+#define DWARF2_FLAG_PROLOGUE_END (1 << 2)
+#define DWARF2_FLAG_EPILOGUE_BEGIN (1 << 3)
+
+private: // MCContext manages these
+ friend class MCContext;
+ friend class MCDwarfLineEntry;
+
+ MCDwarfLoc(unsigned fileNum, unsigned line, unsigned column, unsigned flags,
+ unsigned isa, unsigned discriminator)
+ : FileNum(fileNum), Line(line), Column(column), Flags(flags), Isa(isa),
+ Discriminator(discriminator) {}
+
+ // Allow the default copy constructor and assignment operator to be used
+ // for an MCDwarfLoc object.
+
+public:
+ /// \brief Get the FileNum of this MCDwarfLoc.
+ unsigned getFileNum() const { return FileNum; }
+
+ /// \brief Get the Line of this MCDwarfLoc.
+ unsigned getLine() const { return Line; }
+
+ /// \brief Get the Column of this MCDwarfLoc.
+ unsigned getColumn() const { return Column; }
+
+ /// \brief Get the Flags of this MCDwarfLoc.
+ unsigned getFlags() const { return Flags; }
+
+ /// \brief Get the Isa of this MCDwarfLoc.
+ unsigned getIsa() const { return Isa; }
+
+ /// \brief Get the Discriminator of this MCDwarfLoc.
+ unsigned getDiscriminator() const { return Discriminator; }
+
+ /// \brief Set the FileNum of this MCDwarfLoc.
+ void setFileNum(unsigned fileNum) { FileNum = fileNum; }
+
+ /// \brief Set the Line of this MCDwarfLoc.
+ void setLine(unsigned line) { Line = line; }
+
+ /// \brief Set the Column of this MCDwarfLoc.
+ void setColumn(unsigned column) {
+ assert(column <= UINT16_MAX);
+ Column = column;
+ }
+
+ /// \brief Set the Flags of this MCDwarfLoc.
+ void setFlags(unsigned flags) {
+ assert(flags <= UINT8_MAX);
+ Flags = flags;
+ }
+
+ /// \brief Set the Isa of this MCDwarfLoc.
+ void setIsa(unsigned isa) {
+ assert(isa <= UINT8_MAX);
+ Isa = isa;
+ }
+
+ /// \brief Set the Discriminator of this MCDwarfLoc.
+ void setDiscriminator(unsigned discriminator) {
+ Discriminator = discriminator;
+ }
+};
+
+/// \brief Instances of this class represent the line information for
+/// the dwarf line table entries. Which is created after a machine
+/// instruction is assembled and uses an address from a temporary label
+/// created at the current address in the current section and the info from
+/// the last .loc directive seen as stored in the context.
+class MCDwarfLineEntry : public MCDwarfLoc {
+ MCSymbol *Label;
+
+private:
+ // Allow the default copy constructor and assignment operator to be used
+ // for an MCDwarfLineEntry object.
+
+public:
+ // Constructor to create an MCDwarfLineEntry given a symbol and the dwarf loc.
+ MCDwarfLineEntry(MCSymbol *label, const MCDwarfLoc loc)
+ : MCDwarfLoc(loc), Label(label) {}
+
+ MCSymbol *getLabel() const { return Label; }
+
+ // This is called when an instruction is assembled into the specified
+ // section and if there is information from the last .loc directive that
+ // has yet to have a line entry made for it is made.
+ static void Make(MCObjectStreamer *MCOS, MCSection *Section);
+};
+
+/// \brief Instances of this class represent the line information for a compile
+/// unit where machine instructions have been assembled after seeing .loc
+/// directives. This is the information used to build the dwarf line
+/// table for a section.
+class MCLineSection {
+public:
+ // \brief Add an entry to this MCLineSection's line entries.
+ void addLineEntry(const MCDwarfLineEntry &LineEntry, MCSection *Sec) {
+ MCLineDivisions[Sec].push_back(LineEntry);
+ }
+
+ using MCDwarfLineEntryCollection = std::vector<MCDwarfLineEntry>;
+ using iterator = MCDwarfLineEntryCollection::iterator;
+ using const_iterator = MCDwarfLineEntryCollection::const_iterator;
+ using MCLineDivisionMap = MapVector<MCSection *, MCDwarfLineEntryCollection>;
+
+private:
+ // A collection of MCDwarfLineEntry for each section.
+ MCLineDivisionMap MCLineDivisions;
+
+public:
+ // Returns the collection of MCDwarfLineEntry for a given Compile Unit ID.
+ const MCLineDivisionMap &getMCLineEntries() const {
+ return MCLineDivisions;
+ }
+};
+
+struct MCDwarfLineTableParams {
+ /// First special line opcode - leave room for the standard opcodes.
+ /// Note: If you want to change this, you'll have to update the
+ /// "StandardOpcodeLengths" table that is emitted in
+ /// \c Emit().
+ uint8_t DWARF2LineOpcodeBase = 13;
+ /// Minimum line offset in a special line info. opcode. The value
+ /// -5 was chosen to give a reasonable range of values.
+ int8_t DWARF2LineBase = -5;
+ /// Range of line offsets in a special line info. opcode.
+ uint8_t DWARF2LineRange = 14;
+};
+
+struct MCDwarfLineTableHeader {
+ MCSymbol *Label = nullptr;
+ SmallVector<std::string, 3> MCDwarfDirs;
+ SmallVector<MCDwarfFile, 3> MCDwarfFiles;
+ StringMap<unsigned> SourceIdMap;
+ StringRef CompilationDir;
+ MCDwarfFile RootFile;
+ bool HasMD5 = false;
+ bool HasSource = false;
+
+ MCDwarfLineTableHeader() = default;
+
+ Expected<unsigned> tryGetFile(StringRef &Directory, StringRef &FileName,
+ MD5::MD5Result *Checksum,
+ Optional<StringRef> &Source,
+ unsigned FileNumber = 0);
+ std::pair<MCSymbol *, MCSymbol *>
+ Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
+ Optional<MCDwarfLineStr> &LineStr) const;
+ std::pair<MCSymbol *, MCSymbol *>
+ Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
+ ArrayRef<char> SpecialOpcodeLengths,
+ Optional<MCDwarfLineStr> &LineStr) const;
+
+private:
+ void emitV2FileDirTables(MCStreamer *MCOS) const;
+ void emitV5FileDirTables(MCStreamer *MCOS,
+ Optional<MCDwarfLineStr> &LineStr) const;
+};
+
+class MCDwarfDwoLineTable {
+ MCDwarfLineTableHeader Header;
+
+public:
+ void maybeSetRootFile(StringRef Directory, StringRef FileName,
+ MD5::MD5Result *Checksum, Optional<StringRef> Source) {
+ if (!Header.RootFile.Name.empty())
+ return;
+ Header.CompilationDir = Directory;
+ Header.RootFile.Name = FileName;
+ Header.RootFile.DirIndex = 0;
+ Header.RootFile.Checksum = Checksum;
+ Header.RootFile.Source = Source;
+ Header.HasMD5 = (Checksum != nullptr);
+ Header.HasSource = Source.hasValue();
+ }
+
+ unsigned getFile(StringRef Directory, StringRef FileName,
+ MD5::MD5Result *Checksum, Optional<StringRef> Source) {
+ return cantFail(Header.tryGetFile(Directory, FileName, Checksum, Source));
+ }
+
+ void Emit(MCStreamer &MCOS, MCDwarfLineTableParams Params,
+ MCSection *Section) const;
+};
+
+class MCDwarfLineTable {
+ MCDwarfLineTableHeader Header;
+ MCLineSection MCLineSections;
+
+public:
+ // This emits the Dwarf file and the line tables for all Compile Units.
+ static void Emit(MCObjectStreamer *MCOS, MCDwarfLineTableParams Params);
+
+ // This emits the Dwarf file and the line tables for a given Compile Unit.
+ void EmitCU(MCObjectStreamer *MCOS, MCDwarfLineTableParams Params,
+ Optional<MCDwarfLineStr> &LineStr) const;
+
+ Expected<unsigned> tryGetFile(StringRef &Directory, StringRef &FileName,
+ MD5::MD5Result *Checksum,
+ Optional<StringRef> Source,
+ unsigned FileNumber = 0);
+ unsigned getFile(StringRef &Directory, StringRef &FileName,
+ MD5::MD5Result *Checksum, Optional<StringRef> &Source,
+ unsigned FileNumber = 0) {
+ return cantFail(tryGetFile(Directory, FileName, Checksum, Source,
+ FileNumber));
+ }
+
+ void setRootFile(StringRef Directory, StringRef FileName,
+ MD5::MD5Result *Checksum, Optional<StringRef> Source) {
+ Header.CompilationDir = Directory;
+ Header.RootFile.Name = FileName;
+ Header.RootFile.DirIndex = 0;
+ Header.RootFile.Checksum = Checksum;
+ Header.RootFile.Source = Source;
+ Header.HasMD5 = (Checksum != nullptr);
+ Header.HasSource = Source.hasValue();
+ }
+
+ MCSymbol *getLabel() const {
+ return Header.Label;
+ }
+
+ void setLabel(MCSymbol *Label) {
+ Header.Label = Label;
+ }
+
+ const SmallVectorImpl<std::string> &getMCDwarfDirs() const {
+ return Header.MCDwarfDirs;
+ }
+
+ SmallVectorImpl<std::string> &getMCDwarfDirs() {
+ return Header.MCDwarfDirs;
+ }
+
+ const SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles() const {
+ return Header.MCDwarfFiles;
+ }
+
+ SmallVectorImpl<MCDwarfFile> &getMCDwarfFiles() {
+ return Header.MCDwarfFiles;
+ }
+
+ const MCLineSection &getMCLineSections() const {
+ return MCLineSections;
+ }
+ MCLineSection &getMCLineSections() {
+ return MCLineSections;
+ }
+};
+
+class MCDwarfLineAddr {
+public:
+ /// Utility function to encode a Dwarf pair of LineDelta and AddrDeltas.
+ static void Encode(MCContext &Context, MCDwarfLineTableParams Params,
+ int64_t LineDelta, uint64_t AddrDelta, raw_ostream &OS);
+
+ /// Utility function to emit the encoding to a streamer.
+ static void Emit(MCStreamer *MCOS, MCDwarfLineTableParams Params,
+ int64_t LineDelta, uint64_t AddrDelta);
+};
+
+class MCGenDwarfInfo {
+public:
+ //
+ // When generating dwarf for assembly source files this emits the Dwarf
+ // sections.
+ //
+ static void Emit(MCStreamer *MCOS);
+};
+
+// When generating dwarf for assembly source files this is the info that is
+// needed to be gathered for each symbol that will have a dwarf label.
+class MCGenDwarfLabelEntry {
+private:
+ // Name of the symbol without a leading underbar, if any.
+ StringRef Name;
+ // The dwarf file number this symbol is in.
+ unsigned FileNumber;
+ // The line number this symbol is at.
+ unsigned LineNumber;
+ // The low_pc for the dwarf label is taken from this symbol.
+ MCSymbol *Label;
+
+public:
+ MCGenDwarfLabelEntry(StringRef name, unsigned fileNumber, unsigned lineNumber,
+ MCSymbol *label)
+ : Name(name), FileNumber(fileNumber), LineNumber(lineNumber),
+ Label(label) {}
+
+ StringRef getName() const { return Name; }
+ unsigned getFileNumber() const { return FileNumber; }
+ unsigned getLineNumber() const { return LineNumber; }
+ MCSymbol *getLabel() const { return Label; }
+
+ // This is called when label is created when we are generating dwarf for
+ // assembly source files.
+ static void Make(MCSymbol *Symbol, MCStreamer *MCOS, SourceMgr &SrcMgr,
+ SMLoc &Loc);
+};
+
+class MCCFIInstruction {
+public:
+ enum OpType {
+ OpSameValue,
+ OpRememberState,
+ OpRestoreState,
+ OpOffset,
+ OpDefCfaRegister,
+ OpDefCfaOffset,
+ OpDefCfa,
+ OpRelOffset,
+ OpAdjustCfaOffset,
+ OpEscape,
+ OpRestore,
+ OpUndefined,
+ OpRegister,
+ OpWindowSave,
+ OpGnuArgsSize
+ };
+
+private:
+ OpType Operation;
+ MCSymbol *Label;
+ unsigned Register;
+ union {
+ int Offset;
+ unsigned Register2;
+ };
+ std::vector<char> Values;
+
+ MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R, int O, StringRef V)
+ : Operation(Op), Label(L), Register(R), Offset(O),
+ Values(V.begin(), V.end()) {
+ assert(Op != OpRegister);
+ }
+
+ MCCFIInstruction(OpType Op, MCSymbol *L, unsigned R1, unsigned R2)
+ : Operation(Op), Label(L), Register(R1), Register2(R2) {
+ assert(Op == OpRegister);
+ }
+
+public:
+ /// \brief .cfi_def_cfa defines a rule for computing CFA as: take address from
+ /// Register and add Offset to it.
+ static MCCFIInstruction createDefCfa(MCSymbol *L, unsigned Register,
+ int Offset) {
+ return MCCFIInstruction(OpDefCfa, L, Register, -Offset, "");
+ }
+
+ /// \brief .cfi_def_cfa_register modifies a rule for computing CFA. From now
+ /// on Register will be used instead of the old one. Offset remains the same.
+ static MCCFIInstruction createDefCfaRegister(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpDefCfaRegister, L, Register, 0, "");
+ }
+
+ /// \brief .cfi_def_cfa_offset modifies a rule for computing CFA. Register
+ /// remains the same, but offset is new. Note that it is the absolute offset
+ /// that will be added to a defined register to the compute CFA address.
+ static MCCFIInstruction createDefCfaOffset(MCSymbol *L, int Offset) {
+ return MCCFIInstruction(OpDefCfaOffset, L, 0, -Offset, "");
+ }
+
+ /// \brief .cfi_adjust_cfa_offset Same as .cfi_def_cfa_offset, but
+ /// Offset is a relative value that is added/subtracted from the previous
+ /// offset.
+ static MCCFIInstruction createAdjustCfaOffset(MCSymbol *L, int Adjustment) {
+ return MCCFIInstruction(OpAdjustCfaOffset, L, 0, Adjustment, "");
+ }
+
+ /// \brief .cfi_offset Previous value of Register is saved at offset Offset
+ /// from CFA.
+ static MCCFIInstruction createOffset(MCSymbol *L, unsigned Register,
+ int Offset) {
+ return MCCFIInstruction(OpOffset, L, Register, Offset, "");
+ }
+
+ /// \brief .cfi_rel_offset Previous value of Register is saved at offset
+ /// Offset from the current CFA register. This is transformed to .cfi_offset
+ /// using the known displacement of the CFA register from the CFA.
+ static MCCFIInstruction createRelOffset(MCSymbol *L, unsigned Register,
+ int Offset) {
+ return MCCFIInstruction(OpRelOffset, L, Register, Offset, "");
+ }
+
+ /// \brief .cfi_register Previous value of Register1 is saved in
+ /// register Register2.
+ static MCCFIInstruction createRegister(MCSymbol *L, unsigned Register1,
+ unsigned Register2) {
+ return MCCFIInstruction(OpRegister, L, Register1, Register2);
+ }
+
+ /// \brief .cfi_window_save SPARC register window is saved.
+ static MCCFIInstruction createWindowSave(MCSymbol *L) {
+ return MCCFIInstruction(OpWindowSave, L, 0, 0, "");
+ }
+
+ /// \brief .cfi_restore says that the rule for Register is now the same as it
+ /// was at the beginning of the function, after all initial instructions added
+ /// by .cfi_startproc were executed.
+ static MCCFIInstruction createRestore(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpRestore, L, Register, 0, "");
+ }
+
+ /// \brief .cfi_undefined From now on the previous value of Register can't be
+ /// restored anymore.
+ static MCCFIInstruction createUndefined(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpUndefined, L, Register, 0, "");
+ }
+
+ /// \brief .cfi_same_value Current value of Register is the same as in the
+ /// previous frame. I.e., no restoration is needed.
+ static MCCFIInstruction createSameValue(MCSymbol *L, unsigned Register) {
+ return MCCFIInstruction(OpSameValue, L, Register, 0, "");
+ }
+
+ /// \brief .cfi_remember_state Save all current rules for all registers.
+ static MCCFIInstruction createRememberState(MCSymbol *L) {
+ return MCCFIInstruction(OpRememberState, L, 0, 0, "");
+ }
+
+ /// \brief .cfi_restore_state Restore the previously saved state.
+ static MCCFIInstruction createRestoreState(MCSymbol *L) {
+ return MCCFIInstruction(OpRestoreState, L, 0, 0, "");
+ }
+
+ /// \brief .cfi_escape Allows the user to add arbitrary bytes to the unwind
+ /// info.
+ static MCCFIInstruction createEscape(MCSymbol *L, StringRef Vals) {
+ return MCCFIInstruction(OpEscape, L, 0, 0, Vals);
+ }
+
+ /// \brief A special wrapper for .cfi_escape that indicates GNU_ARGS_SIZE
+ static MCCFIInstruction createGnuArgsSize(MCSymbol *L, int Size) {
+ return MCCFIInstruction(OpGnuArgsSize, L, 0, Size, "");
+ }
+
+ OpType getOperation() const { return Operation; }
+ MCSymbol *getLabel() const { return Label; }
+
+ unsigned getRegister() const {
+ assert(Operation == OpDefCfa || Operation == OpOffset ||
+ Operation == OpRestore || Operation == OpUndefined ||
+ Operation == OpSameValue || Operation == OpDefCfaRegister ||
+ Operation == OpRelOffset || Operation == OpRegister);
+ return Register;
+ }
+
+ unsigned getRegister2() const {
+ assert(Operation == OpRegister);
+ return Register2;
+ }
+
+ int getOffset() const {
+ assert(Operation == OpDefCfa || Operation == OpOffset ||
+ Operation == OpRelOffset || Operation == OpDefCfaOffset ||
+ Operation == OpAdjustCfaOffset || Operation == OpGnuArgsSize);
+ return Offset;
+ }
+
+ StringRef getValues() const {
+ assert(Operation == OpEscape);
+ return StringRef(&Values[0], Values.size());
+ }
+};
+
+struct MCDwarfFrameInfo {
+ MCDwarfFrameInfo() = default;
+
+ MCSymbol *Begin = nullptr;
+ MCSymbol *End = nullptr;
+ const MCSymbol *Personality = nullptr;
+ const MCSymbol *Lsda = nullptr;
+ std::vector<MCCFIInstruction> Instructions;
+ unsigned CurrentCfaRegister = 0;
+ unsigned PersonalityEncoding = 0;
+ unsigned LsdaEncoding = 0;
+ uint32_t CompactUnwindEncoding = 0;
+ bool IsSignalFrame = false;
+ bool IsSimple = false;
+ unsigned RAReg = static_cast<unsigned>(INT_MAX);
+};
+
+class MCDwarfFrameEmitter {
+public:
+ //
+ // This emits the frame info section.
+ //
+ static void Emit(MCObjectStreamer &streamer, MCAsmBackend *MAB, bool isEH);
+ static void EmitAdvanceLoc(MCObjectStreamer &Streamer, uint64_t AddrDelta);
+ static void EncodeAdvanceLoc(MCContext &Context, uint64_t AddrDelta,
+ raw_ostream &OS);
+};
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCDWARF_H