Update prebuilt Clang to r383902.

clang 11.0.1 (based on r383902) from build 6443078.

Bug: http://b/149839606
Test: N/A
Change-Id: Id966d7b2cbaf3d2711a1e528c41a173ae28f6c11

1 files changed, 558 insertions, 0 deletions

diff --git a/clang-r383902/include/llvm/MC/MCFragment.h b/clang-r383902/include/llvm/MC/MCFragment.h
new file mode 100644
index 00000000..ed237eb1
--- /dev/null
+++ b/clang-r383902/include/llvm/MC/MCFragment.h
@@ -0,0 +1,558 @@
+//===- MCFragment.h - Fragment type hierarchy -------------------*- C++ -*-===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCFRAGMENT_H
+#define LLVM_MC_MCFRAGMENT_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/ilist_node.h"
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/Support/Alignment.h"
+#include "llvm/Support/Casting.h"
+#include "llvm/Support/SMLoc.h"
+#include <cstdint>
+#include <utility>
+
+namespace llvm {
+
+class MCSection;
+class MCSubtargetInfo;
+class MCSymbol;
+
+class MCFragment : public ilist_node_with_parent<MCFragment, MCSection> {
+  friend class MCAsmLayout;
+
+public:
+  enum FragmentType : uint8_t {
+    FT_Align,
+    FT_Data,
+    FT_CompactEncodedInst,
+    FT_Fill,
+    FT_Relaxable,
+    FT_Org,
+    FT_Dwarf,
+    FT_DwarfFrame,
+    FT_LEB,
+    FT_BoundaryAlign,
+    FT_SymbolId,
+    FT_CVInlineLines,
+    FT_CVDefRange,
+    FT_Dummy
+  };
+
+private:
+  /// The data for the section this fragment is in.
+  MCSection *Parent;
+
+  /// The atom this fragment is in, as represented by its defining symbol.
+  const MCSymbol *Atom;
+
+  /// The offset of this fragment in its section. This is ~0 until
+  /// initialized.
+  uint64_t Offset;
+
+  /// The layout order of this fragment.
+  unsigned LayoutOrder;
+
+  FragmentType Kind;
+
+protected:
+  bool HasInstructions;
+
+  MCFragment(FragmentType Kind, bool HasInstructions,
+             MCSection *Parent = nullptr);
+
+public:
+  MCFragment() = delete;
+  MCFragment(const MCFragment &) = delete;
+  MCFragment &operator=(const MCFragment &) = delete;
+
+  /// Destroys the current fragment.
+  ///
+  /// This must be used instead of delete as MCFragment is non-virtual.
+  /// This method will dispatch to the appropriate subclass.
+  void destroy();
+
+  FragmentType getKind() const { return Kind; }
+
+  MCSection *getParent() const { return Parent; }
+  void setParent(MCSection *Value) { Parent = Value; }
+
+  const MCSymbol *getAtom() const { return Atom; }
+  void setAtom(const MCSymbol *Value) { Atom = Value; }
+
+  unsigned getLayoutOrder() const { return LayoutOrder; }
+  void setLayoutOrder(unsigned Value) { LayoutOrder = Value; }
+
+  /// Does this fragment have instructions emitted into it? By default
+  /// this is false, but specific fragment types may set it to true.
+  bool hasInstructions() const { return HasInstructions; }
+
+  void dump() const;
+};
+
+class MCDummyFragment : public MCFragment {
+public:
+  explicit MCDummyFragment(MCSection *Sec) : MCFragment(FT_Dummy, false, Sec) {}
+
+  static bool classof(const MCFragment *F) { return F->getKind() == FT_Dummy; }
+};
+
+/// Interface implemented by fragments that contain encoded instructions and/or
+/// data.
+///
+class MCEncodedFragment : public MCFragment {
+  /// Should this fragment be aligned to the end of a bundle?
+  bool AlignToBundleEnd = false;
+
+  uint8_t BundlePadding = 0;
+
+protected:
+  MCEncodedFragment(MCFragment::FragmentType FType, bool HasInstructions,
+                    MCSection *Sec)
+      : MCFragment(FType, HasInstructions, Sec) {}
+
+  /// The MCSubtargetInfo in effect when the instruction was encoded.
+  /// It must be non-null for instructions.
+  const MCSubtargetInfo *STI = nullptr;
+
+public:
+  static bool classof(const MCFragment *F) {
+    MCFragment::FragmentType Kind = F->getKind();
+    switch (Kind) {
+    default:
+      return false;
+    case MCFragment::FT_Relaxable:
+    case MCFragment::FT_CompactEncodedInst:
+    case MCFragment::FT_Data:
+    case MCFragment::FT_Dwarf:
+    case MCFragment::FT_DwarfFrame:
+      return true;
+    }
+  }
+
+  /// Should this fragment be placed at the end of an aligned bundle?
+  bool alignToBundleEnd() const { return AlignToBundleEnd; }
+  void setAlignToBundleEnd(bool V) { AlignToBundleEnd = V; }
+
+  /// Get the padding size that must be inserted before this fragment.
+  /// Used for bundling. By default, no padding is inserted.
+  /// Note that padding size is restricted to 8 bits. This is an optimization
+  /// to reduce the amount of space used for each fragment. In practice, larger
+  /// padding should never be required.
+  uint8_t getBundlePadding() const { return BundlePadding; }
+
+  /// Set the padding size for this fragment. By default it's a no-op,
+  /// and only some fragments have a meaningful implementation.
+  void setBundlePadding(uint8_t N) { BundlePadding = N; }
+
+  /// Retrieve the MCSubTargetInfo in effect when the instruction was encoded.
+  /// Guaranteed to be non-null if hasInstructions() == true
+  const MCSubtargetInfo *getSubtargetInfo() const { return STI; }
+
+  /// Record that the fragment contains instructions with the MCSubtargetInfo in
+  /// effect when the instruction was encoded.
+  void setHasInstructions(const MCSubtargetInfo &STI) {
+    HasInstructions = true;
+    this->STI = &STI;
+  }
+};
+
+/// Interface implemented by fragments that contain encoded instructions and/or
+/// data.
+///
+template<unsigned ContentsSize>
+class MCEncodedFragmentWithContents : public MCEncodedFragment {
+  SmallVector<char, ContentsSize> Contents;
+
+protected:
+  MCEncodedFragmentWithContents(MCFragment::FragmentType FType,
+                                bool HasInstructions,
+                                MCSection *Sec)
+      : MCEncodedFragment(FType, HasInstructions, Sec) {}
+
+public:
+  SmallVectorImpl<char> &getContents() { return Contents; }
+  const SmallVectorImpl<char> &getContents() const { return Contents; }
+};
+
+/// Interface implemented by fragments that contain encoded instructions and/or
+/// data and also have fixups registered.
+///
+template<unsigned ContentsSize, unsigned FixupsSize>
+class MCEncodedFragmentWithFixups :
+  public MCEncodedFragmentWithContents<ContentsSize> {
+
+  /// The list of fixups in this fragment.
+  SmallVector<MCFixup, FixupsSize> Fixups;
+
+protected:
+  MCEncodedFragmentWithFixups(MCFragment::FragmentType FType,
+                              bool HasInstructions,
+                              MCSection *Sec)
+      : MCEncodedFragmentWithContents<ContentsSize>(FType, HasInstructions,
+                                                    Sec) {}
+
+public:
+
+  using const_fixup_iterator = SmallVectorImpl<MCFixup>::const_iterator;
+  using fixup_iterator = SmallVectorImpl<MCFixup>::iterator;
+
+  SmallVectorImpl<MCFixup> &getFixups() { return Fixups; }
+  const SmallVectorImpl<MCFixup> &getFixups() const { return Fixups; }
+
+  fixup_iterator fixup_begin() { return Fixups.begin(); }
+  const_fixup_iterator fixup_begin() const { return Fixups.begin(); }
+
+  fixup_iterator fixup_end() { return Fixups.end(); }
+  const_fixup_iterator fixup_end() const { return Fixups.end(); }
+
+  static bool classof(const MCFragment *F) {
+    MCFragment::FragmentType Kind = F->getKind();
+    return Kind == MCFragment::FT_Relaxable || Kind == MCFragment::FT_Data ||
+           Kind == MCFragment::FT_CVDefRange || Kind == MCFragment::FT_Dwarf ||
+           Kind == MCFragment::FT_DwarfFrame;
+  }
+};
+
+/// Fragment for data and encoded instructions.
+///
+class MCDataFragment : public MCEncodedFragmentWithFixups<32, 4> {
+public:
+  MCDataFragment(MCSection *Sec = nullptr)
+      : MCEncodedFragmentWithFixups<32, 4>(FT_Data, false, Sec) {}
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_Data;
+  }
+};
+
+/// This is a compact (memory-size-wise) fragment for holding an encoded
+/// instruction (non-relaxable) that has no fixups registered. When applicable,
+/// it can be used instead of MCDataFragment and lead to lower memory
+/// consumption.
+///
+class MCCompactEncodedInstFragment : public MCEncodedFragmentWithContents<4> {
+public:
+  MCCompactEncodedInstFragment(MCSection *Sec = nullptr)
+      : MCEncodedFragmentWithContents(FT_CompactEncodedInst, true, Sec) {
+  }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_CompactEncodedInst;
+  }
+};
+
+/// A relaxable fragment holds on to its MCInst, since it may need to be
+/// relaxed during the assembler layout and relaxation stage.
+///
+class MCRelaxableFragment : public MCEncodedFragmentWithFixups<8, 1> {
+
+  /// The instruction this is a fragment for.
+  MCInst Inst;
+
+public:
+  MCRelaxableFragment(const MCInst &Inst, const MCSubtargetInfo &STI,
+                      MCSection *Sec = nullptr)
+      : MCEncodedFragmentWithFixups(FT_Relaxable, true, Sec),
+        Inst(Inst) { this->STI = &STI; }
+
+  const MCInst &getInst() const { return Inst; }
+  void setInst(const MCInst &Value) { Inst = Value; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_Relaxable;
+  }
+};
+
+class MCAlignFragment : public MCFragment {
+  /// The alignment to ensure, in bytes.
+  unsigned Alignment;
+
+  /// Flag to indicate that (optimal) NOPs should be emitted instead
+  /// of using the provided value. The exact interpretation of this flag is
+  /// target dependent.
+  bool EmitNops : 1;
+
+  /// Value to use for filling padding bytes.
+  int64_t Value;
+
+  /// The size of the integer (in bytes) of \p Value.
+  unsigned ValueSize;
+
+  /// The maximum number of bytes to emit; if the alignment
+  /// cannot be satisfied in this width then this fragment is ignored.
+  unsigned MaxBytesToEmit;
+
+public:
+  MCAlignFragment(unsigned Alignment, int64_t Value, unsigned ValueSize,
+                  unsigned MaxBytesToEmit, MCSection *Sec = nullptr)
+      : MCFragment(FT_Align, false, Sec), Alignment(Alignment), EmitNops(false),
+        Value(Value), ValueSize(ValueSize), MaxBytesToEmit(MaxBytesToEmit) {}
+
+  unsigned getAlignment() const { return Alignment; }
+
+  int64_t getValue() const { return Value; }
+
+  unsigned getValueSize() const { return ValueSize; }
+
+  unsigned getMaxBytesToEmit() const { return MaxBytesToEmit; }
+
+  bool hasEmitNops() const { return EmitNops; }
+  void setEmitNops(bool Value) { EmitNops = Value; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_Align;
+  }
+};
+
+class MCFillFragment : public MCFragment {
+  uint8_t ValueSize;
+  /// Value to use for filling bytes.
+  uint64_t Value;
+  /// The number of bytes to insert.
+  const MCExpr &NumValues;
+
+  /// Source location of the directive that this fragment was created for.
+  SMLoc Loc;
+
+public:
+  MCFillFragment(uint64_t Value, uint8_t VSize, const MCExpr &NumValues,
+                 SMLoc Loc, MCSection *Sec = nullptr)
+      : MCFragment(FT_Fill, false, Sec), ValueSize(VSize), Value(Value),
+        NumValues(NumValues), Loc(Loc) {}
+
+  uint64_t getValue() const { return Value; }
+  uint8_t getValueSize() const { return ValueSize; }
+  const MCExpr &getNumValues() const { return NumValues; }
+
+  SMLoc getLoc() const { return Loc; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_Fill;
+  }
+};
+
+class MCOrgFragment : public MCFragment {
+  /// Value to use for filling bytes.
+  int8_t Value;
+
+  /// The offset this fragment should start at.
+  const MCExpr *Offset;
+
+  /// Source location of the directive that this fragment was created for.
+  SMLoc Loc;
+
+public:
+  MCOrgFragment(const MCExpr &Offset, int8_t Value, SMLoc Loc,
+                MCSection *Sec = nullptr)
+      : MCFragment(FT_Org, false, Sec), Value(Value), Offset(&Offset),
+        Loc(Loc) {}
+
+  const MCExpr &getOffset() const { return *Offset; }
+
+  uint8_t getValue() const { return Value; }
+
+  SMLoc getLoc() const { return Loc; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_Org;
+  }
+};
+
+class MCLEBFragment : public MCFragment {
+  /// True if this is a sleb128, false if uleb128.
+  bool IsSigned;
+
+  /// The value this fragment should contain.
+  const MCExpr *Value;
+
+  SmallString<8> Contents;
+
+public:
+  MCLEBFragment(const MCExpr &Value_, bool IsSigned_, MCSection *Sec = nullptr)
+      : MCFragment(FT_LEB, false, Sec), IsSigned(IsSigned_), Value(&Value_) {
+    Contents.push_back(0);
+  }
+
+  const MCExpr &getValue() const { return *Value; }
+
+  bool isSigned() const { return IsSigned; }
+
+  SmallString<8> &getContents() { return Contents; }
+  const SmallString<8> &getContents() const { return Contents; }
+
+  /// @}
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_LEB;
+  }
+};
+
+class MCDwarfLineAddrFragment : public MCEncodedFragmentWithFixups<8, 1> {
+  /// The value of the difference between the two line numbers
+  /// between two .loc dwarf directives.
+  int64_t LineDelta;
+
+  /// The expression for the difference of the two symbols that
+  /// make up the address delta between two .loc dwarf directives.
+  const MCExpr *AddrDelta;
+
+public:
+  MCDwarfLineAddrFragment(int64_t LineDelta, const MCExpr &AddrDelta,
+                          MCSection *Sec = nullptr)
+      : MCEncodedFragmentWithFixups<8, 1>(FT_Dwarf, false, Sec),
+        LineDelta(LineDelta), AddrDelta(&AddrDelta) {}
+
+  int64_t getLineDelta() const { return LineDelta; }
+
+  const MCExpr &getAddrDelta() const { return *AddrDelta; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_Dwarf;
+  }
+};
+
+class MCDwarfCallFrameFragment : public MCEncodedFragmentWithFixups<8, 1> {
+  /// The expression for the difference of the two symbols that
+  /// make up the address delta between two .cfi_* dwarf directives.
+  const MCExpr *AddrDelta;
+
+public:
+  MCDwarfCallFrameFragment(const MCExpr &AddrDelta, MCSection *Sec = nullptr)
+      : MCEncodedFragmentWithFixups<8, 1>(FT_DwarfFrame, false, Sec),
+        AddrDelta(&AddrDelta) {}
+
+  const MCExpr &getAddrDelta() const { return *AddrDelta; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_DwarfFrame;
+  }
+};
+
+/// Represents a symbol table index fragment.
+class MCSymbolIdFragment : public MCFragment {
+  const MCSymbol *Sym;
+
+public:
+  MCSymbolIdFragment(const MCSymbol *Sym, MCSection *Sec = nullptr)
+      : MCFragment(FT_SymbolId, false, Sec), Sym(Sym) {}
+
+  const MCSymbol *getSymbol() { return Sym; }
+  const MCSymbol *getSymbol() const { return Sym; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_SymbolId;
+  }
+};
+
+/// Fragment representing the binary annotations produced by the
+/// .cv_inline_linetable directive.
+class MCCVInlineLineTableFragment : public MCFragment {
+  unsigned SiteFuncId;
+  unsigned StartFileId;
+  unsigned StartLineNum;
+  const MCSymbol *FnStartSym;
+  const MCSymbol *FnEndSym;
+  SmallString<8> Contents;
+
+  /// CodeViewContext has the real knowledge about this format, so let it access
+  /// our members.
+  friend class CodeViewContext;
+
+public:
+  MCCVInlineLineTableFragment(unsigned SiteFuncId, unsigned StartFileId,
+                              unsigned StartLineNum, const MCSymbol *FnStartSym,
+                              const MCSymbol *FnEndSym,
+                              MCSection *Sec = nullptr)
+      : MCFragment(FT_CVInlineLines, false, Sec), SiteFuncId(SiteFuncId),
+        StartFileId(StartFileId), StartLineNum(StartLineNum),
+        FnStartSym(FnStartSym), FnEndSym(FnEndSym) {}
+
+  const MCSymbol *getFnStartSym() const { return FnStartSym; }
+  const MCSymbol *getFnEndSym() const { return FnEndSym; }
+
+  SmallString<8> &getContents() { return Contents; }
+  const SmallString<8> &getContents() const { return Contents; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_CVInlineLines;
+  }
+};
+
+/// Fragment representing the .cv_def_range directive.
+class MCCVDefRangeFragment : public MCEncodedFragmentWithFixups<32, 4> {
+  SmallVector<std::pair<const MCSymbol *, const MCSymbol *>, 2> Ranges;
+  SmallString<32> FixedSizePortion;
+
+  /// CodeViewContext has the real knowledge about this format, so let it access
+  /// our members.
+  friend class CodeViewContext;
+
+public:
+  MCCVDefRangeFragment(
+      ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> Ranges,
+      StringRef FixedSizePortion, MCSection *Sec = nullptr)
+      : MCEncodedFragmentWithFixups<32, 4>(FT_CVDefRange, false, Sec),
+        Ranges(Ranges.begin(), Ranges.end()),
+        FixedSizePortion(FixedSizePortion) {}
+
+  ArrayRef<std::pair<const MCSymbol *, const MCSymbol *>> getRanges() const {
+    return Ranges;
+  }
+
+  StringRef getFixedSizePortion() const { return FixedSizePortion; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_CVDefRange;
+  }
+};
+
+/// Represents required padding such that a particular other set of fragments
+/// does not cross a particular power-of-two boundary. The other fragments must
+/// follow this one within the same section.
+class MCBoundaryAlignFragment : public MCFragment {
+  /// The alignment requirement of the branch to be aligned.
+  Align AlignBoundary;
+  /// Flag to indicate whether the branch is fused.  Use in determining the
+  /// region of fragments being aligned.
+  bool Fused : 1;
+  /// Flag to indicate whether NOPs should be emitted.
+  bool EmitNops : 1;
+  /// The size of the fragment.  The size is lazily set during relaxation, and
+  /// is not meaningful before that.
+  uint64_t Size = 0;
+
+public:
+  MCBoundaryAlignFragment(Align AlignBoundary, bool Fused = false,
+                          bool EmitNops = false, MCSection *Sec = nullptr)
+      : MCFragment(FT_BoundaryAlign, false, Sec), AlignBoundary(AlignBoundary),
+        Fused(Fused), EmitNops(EmitNops) {}
+
+  uint64_t getSize() const { return Size; }
+  void setSize(uint64_t Value) { Size = Value; }
+
+  Align getAlignment() const { return AlignBoundary; }
+
+  bool isFused() const { return Fused; }
+  void setFused(bool Value) { Fused = Value; }
+
+  bool canEmitNops() const { return EmitNops; }
+  void setEmitNops(bool Value) { EmitNops = Value; }
+
+  static bool classof(const MCFragment *F) {
+    return F->getKind() == MCFragment::FT_BoundaryAlign;
+  }
+};
+} // end namespace llvm
+
+#endif // LLVM_MC_MCFRAGMENT_H