1 files changed, 604 insertions, 0 deletions
diff --git a/contrib/llvm/lib/CodeGen/MIRParser/MILexer.cpp b/contrib/llvm/lib/CodeGen/MIRParser/MILexer.cpp
new file mode 100644
index 0000000..28f9d4e
--- /dev/null
+++ b/contrib/llvm/lib/CodeGen/MIRParser/MILexer.cpp
@@ -0,0 +1,604 @@
+//===- MILexer.cpp - Machine instructions lexer implementation ----------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the lexing of machine instructions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MILexer.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/Twine.h"
+#include <cctype>
+
+using namespace llvm;
+
+namespace {
+
+/// This class provides a way to iterate and get characters from the source
+/// string.
+class Cursor {
+  const char *Ptr;
+  const char *End;
+
+public:
+  Cursor(NoneType) : Ptr(nullptr), End(nullptr) {}
+
+  explicit Cursor(StringRef Str) {
+    Ptr = Str.data();
+    End = Ptr + Str.size();
+  }
+
+  bool isEOF() const { return Ptr == End; }
+
+  char peek(int I = 0) const { return End - Ptr <= I ? 0 : Ptr[I]; }
+
+  void advance(unsigned I = 1) { Ptr += I; }
+
+  StringRef remaining() const { return StringRef(Ptr, End - Ptr); }
+
+  StringRef upto(Cursor C) const {
+    assert(C.Ptr >= Ptr && C.Ptr <= End);
+    return StringRef(Ptr, C.Ptr - Ptr);
+  }
+
+  StringRef::iterator location() const { return Ptr; }
+
+  operator bool() const { return Ptr != nullptr; }
+};
+
+} // end anonymous namespace
+
+MIToken &MIToken::reset(TokenKind Kind, StringRef Range) {
+  this->Kind = Kind;
+  this->Range = Range;
+  return *this;
+}
+
+MIToken &MIToken::setStringValue(StringRef StrVal) {
+  StringValue = StrVal;
+  return *this;
+}
+
+MIToken &MIToken::setOwnedStringValue(std::string StrVal) {
+  StringValueStorage = std::move(StrVal);
+  StringValue = StringValueStorage;
+  return *this;
+}
+
+MIToken &MIToken::setIntegerValue(APSInt IntVal) {
+  this->IntVal = std::move(IntVal);
+  return *this;
+}
+
+/// Skip the leading whitespace characters and return the updated cursor.
+static Cursor skipWhitespace(Cursor C) {
+  while (isblank(C.peek()))
+    C.advance();
+  return C;
+}
+
+static bool isNewlineChar(char C) { return C == '\n' || C == '\r'; }
+
+/// Skip a line comment and return the updated cursor.
+static Cursor skipComment(Cursor C) {
+  if (C.peek() != ';')
+    return C;
+  while (!isNewlineChar(C.peek()) && !C.isEOF())
+    C.advance();
+  return C;
+}
+
+/// Return true if the given character satisfies the following regular
+/// expression: [-a-zA-Z$._0-9]
+static bool isIdentifierChar(char C) {
+  return isalpha(C) || isdigit(C) || C == '_' || C == '-' || C == '.' ||
+         C == '$';
+}
+
+/// Unescapes the given string value.
+///
+/// Expects the string value to be quoted.
+static std::string unescapeQuotedString(StringRef Value) {
+  assert(Value.front() == '"' && Value.back() == '"');
+  Cursor C = Cursor(Value.substr(1, Value.size() - 2));
+
+  std::string Str;
+  Str.reserve(C.remaining().size());
+  while (!C.isEOF()) {
+    char Char = C.peek();
+    if (Char == '\\') {
+      if (C.peek(1) == '\\') {
+        // Two '\' become one
+        Str += '\\';
+        C.advance(2);
+        continue;
+      }
+      if (isxdigit(C.peek(1)) && isxdigit(C.peek(2))) {
+        Str += hexDigitValue(C.peek(1)) * 16 + hexDigitValue(C.peek(2));
+        C.advance(3);
+        continue;
+      }
+    }
+    Str += Char;
+    C.advance();
+  }
+  return Str;
+}
+
+/// Lex a string constant using the following regular expression: \"[^\"]*\"
+static Cursor lexStringConstant(
+    Cursor C,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  assert(C.peek() == '"');
+  for (C.advance(); C.peek() != '"'; C.advance()) {
+    if (C.isEOF() || isNewlineChar(C.peek())) {
+      ErrorCallback(
+          C.location(),
+          "end of machine instruction reached before the closing '\"'");
+      return None;
+    }
+  }
+  C.advance();
+  return C;
+}
+
+static Cursor lexName(
+    Cursor C, MIToken &Token, MIToken::TokenKind Type, unsigned PrefixLength,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  auto Range = C;
+  C.advance(PrefixLength);
+  if (C.peek() == '"') {
+    if (Cursor R = lexStringConstant(C, ErrorCallback)) {
+      StringRef String = Range.upto(R);
+      Token.reset(Type, String)
+          .setOwnedStringValue(
+              unescapeQuotedString(String.drop_front(PrefixLength)));
+      return R;
+    }
+    Token.reset(MIToken::Error, Range.remaining());
+    return Range;
+  }
+  while (isIdentifierChar(C.peek()))
+    C.advance();
+  Token.reset(Type, Range.upto(C))
+      .setStringValue(Range.upto(C).drop_front(PrefixLength));
+  return C;
+}
+
+static Cursor maybeLexIntegerType(Cursor C, MIToken &Token) {
+  if (C.peek() != 'i' || !isdigit(C.peek(1)))
+    return None;
+  auto Range = C;
+  C.advance(); // Skip 'i'
+  while (isdigit(C.peek()))
+    C.advance();
+  Token.reset(MIToken::IntegerType, Range.upto(C));
+  return C;
+}
+
+static MIToken::TokenKind getIdentifierKind(StringRef Identifier) {
+  return StringSwitch<MIToken::TokenKind>(Identifier)
+      .Case("_", MIToken::underscore)
+      .Case("implicit", MIToken::kw_implicit)
+      .Case("implicit-def", MIToken::kw_implicit_define)
+      .Case("def", MIToken::kw_def)
+      .Case("dead", MIToken::kw_dead)
+      .Case("killed", MIToken::kw_killed)
+      .Case("undef", MIToken::kw_undef)
+      .Case("internal", MIToken::kw_internal)
+      .Case("early-clobber", MIToken::kw_early_clobber)
+      .Case("debug-use", MIToken::kw_debug_use)
+      .Case("tied-def", MIToken::kw_tied_def)
+      .Case("frame-setup", MIToken::kw_frame_setup)
+      .Case("debug-location", MIToken::kw_debug_location)
+      .Case(".cfi_same_value", MIToken::kw_cfi_same_value)
+      .Case(".cfi_offset", MIToken::kw_cfi_offset)
+      .Case(".cfi_def_cfa_register", MIToken::kw_cfi_def_cfa_register)
+      .Case(".cfi_def_cfa_offset", MIToken::kw_cfi_def_cfa_offset)
+      .Case(".cfi_def_cfa", MIToken::kw_cfi_def_cfa)
+      .Case("blockaddress", MIToken::kw_blockaddress)
+      .Case("target-index", MIToken::kw_target_index)
+      .Case("half", MIToken::kw_half)
+      .Case("float", MIToken::kw_float)
+      .Case("double", MIToken::kw_double)
+      .Case("x86_fp80", MIToken::kw_x86_fp80)
+      .Case("fp128", MIToken::kw_fp128)
+      .Case("ppc_fp128", MIToken::kw_ppc_fp128)
+      .Case("target-flags", MIToken::kw_target_flags)
+      .Case("volatile", MIToken::kw_volatile)
+      .Case("non-temporal", MIToken::kw_non_temporal)
+      .Case("invariant", MIToken::kw_invariant)
+      .Case("align", MIToken::kw_align)
+      .Case("stack", MIToken::kw_stack)
+      .Case("got", MIToken::kw_got)
+      .Case("jump-table", MIToken::kw_jump_table)
+      .Case("constant-pool", MIToken::kw_constant_pool)
+      .Case("call-entry", MIToken::kw_call_entry)
+      .Case("liveout", MIToken::kw_liveout)
+      .Case("address-taken", MIToken::kw_address_taken)
+      .Case("landing-pad", MIToken::kw_landing_pad)
+      .Case("liveins", MIToken::kw_liveins)
+      .Case("successors", MIToken::kw_successors)
+      .Default(MIToken::Identifier);
+}
+
+static Cursor maybeLexIdentifier(Cursor C, MIToken &Token) {
+  if (!isalpha(C.peek()) && C.peek() != '_' && C.peek() != '.')
+    return None;
+  auto Range = C;
+  while (isIdentifierChar(C.peek()))
+    C.advance();
+  auto Identifier = Range.upto(C);
+  Token.reset(getIdentifierKind(Identifier), Identifier)
+      .setStringValue(Identifier);
+  return C;
+}
+
+static Cursor maybeLexMachineBasicBlock(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  bool IsReference = C.remaining().startswith("%bb.");
+  if (!IsReference && !C.remaining().startswith("bb."))
+    return None;
+  auto Range = C;
+  unsigned PrefixLength = IsReference ? 4 : 3;
+  C.advance(PrefixLength); // Skip '%bb.' or 'bb.'
+  if (!isdigit(C.peek())) {
+    Token.reset(MIToken::Error, C.remaining());
+    ErrorCallback(C.location(), "expected a number after '%bb.'");
+    return C;
+  }
+  auto NumberRange = C;
+  while (isdigit(C.peek()))
+    C.advance();
+  StringRef Number = NumberRange.upto(C);
+  unsigned StringOffset = PrefixLength + Number.size(); // Drop '%bb.<id>'
+  if (C.peek() == '.') {
+    C.advance(); // Skip '.'
+    ++StringOffset;
+    while (isIdentifierChar(C.peek()))
+      C.advance();
+  }
+  Token.reset(IsReference ? MIToken::MachineBasicBlock
+                          : MIToken::MachineBasicBlockLabel,
+              Range.upto(C))
+      .setIntegerValue(APSInt(Number))
+      .setStringValue(Range.upto(C).drop_front(StringOffset));
+  return C;
+}
+
+static Cursor maybeLexIndex(Cursor C, MIToken &Token, StringRef Rule,
+                            MIToken::TokenKind Kind) {
+  if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size())))
+    return None;
+  auto Range = C;
+  C.advance(Rule.size());
+  auto NumberRange = C;
+  while (isdigit(C.peek()))
+    C.advance();
+  Token.reset(Kind, Range.upto(C)).setIntegerValue(APSInt(NumberRange.upto(C)));
+  return C;
+}
+
+static Cursor maybeLexIndexAndName(Cursor C, MIToken &Token, StringRef Rule,
+                                   MIToken::TokenKind Kind) {
+  if (!C.remaining().startswith(Rule) || !isdigit(C.peek(Rule.size())))
+    return None;
+  auto Range = C;
+  C.advance(Rule.size());
+  auto NumberRange = C;
+  while (isdigit(C.peek()))
+    C.advance();
+  StringRef Number = NumberRange.upto(C);
+  unsigned StringOffset = Rule.size() + Number.size();
+  if (C.peek() == '.') {
+    C.advance();
+    ++StringOffset;
+    while (isIdentifierChar(C.peek()))
+      C.advance();
+  }
+  Token.reset(Kind, Range.upto(C))
+      .setIntegerValue(APSInt(Number))
+      .setStringValue(Range.upto(C).drop_front(StringOffset));
+  return C;
+}
+
+static Cursor maybeLexJumpTableIndex(Cursor C, MIToken &Token) {
+  return maybeLexIndex(C, Token, "%jump-table.", MIToken::JumpTableIndex);
+}
+
+static Cursor maybeLexStackObject(Cursor C, MIToken &Token) {
+  return maybeLexIndexAndName(C, Token, "%stack.", MIToken::StackObject);
+}
+
+static Cursor maybeLexFixedStackObject(Cursor C, MIToken &Token) {
+  return maybeLexIndex(C, Token, "%fixed-stack.", MIToken::FixedStackObject);
+}
+
+static Cursor maybeLexConstantPoolItem(Cursor C, MIToken &Token) {
+  return maybeLexIndex(C, Token, "%const.", MIToken::ConstantPoolItem);
+}
+
+static Cursor maybeLexIRBlock(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  const StringRef Rule = "%ir-block.";
+  if (!C.remaining().startswith(Rule))
+    return None;
+  if (isdigit(C.peek(Rule.size())))
+    return maybeLexIndex(C, Token, Rule, MIToken::IRBlock);
+  return lexName(C, Token, MIToken::NamedIRBlock, Rule.size(), ErrorCallback);
+}
+
+static Cursor maybeLexIRValue(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  const StringRef Rule = "%ir.";
+  if (!C.remaining().startswith(Rule))
+    return None;
+  if (isdigit(C.peek(Rule.size())))
+    return maybeLexIndex(C, Token, Rule, MIToken::IRValue);
+  return lexName(C, Token, MIToken::NamedIRValue, Rule.size(), ErrorCallback);
+}
+
+static Cursor lexVirtualRegister(Cursor C, MIToken &Token) {
+  auto Range = C;
+  C.advance(); // Skip '%'
+  auto NumberRange = C;
+  while (isdigit(C.peek()))
+    C.advance();
+  Token.reset(MIToken::VirtualRegister, Range.upto(C))
+      .setIntegerValue(APSInt(NumberRange.upto(C)));
+  return C;
+}
+
+static Cursor maybeLexRegister(Cursor C, MIToken &Token) {
+  if (C.peek() != '%')
+    return None;
+  if (isdigit(C.peek(1)))
+    return lexVirtualRegister(C, Token);
+  auto Range = C;
+  C.advance(); // Skip '%'
+  while (isIdentifierChar(C.peek()))
+    C.advance();
+  Token.reset(MIToken::NamedRegister, Range.upto(C))
+      .setStringValue(Range.upto(C).drop_front(1)); // Drop the '%'
+  return C;
+}
+
+static Cursor maybeLexGlobalValue(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  if (C.peek() != '@')
+    return None;
+  if (!isdigit(C.peek(1)))
+    return lexName(C, Token, MIToken::NamedGlobalValue, /*PrefixLength=*/1,
+                   ErrorCallback);
+  auto Range = C;
+  C.advance(1); // Skip the '@'
+  auto NumberRange = C;
+  while (isdigit(C.peek()))
+    C.advance();
+  Token.reset(MIToken::GlobalValue, Range.upto(C))
+      .setIntegerValue(APSInt(NumberRange.upto(C)));
+  return C;
+}
+
+static Cursor maybeLexExternalSymbol(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  if (C.peek() != '$')
+    return None;
+  return lexName(C, Token, MIToken::ExternalSymbol, /*PrefixLength=*/1,
+                 ErrorCallback);
+}
+
+static bool isValidHexFloatingPointPrefix(char C) {
+  return C == 'H' || C == 'K' || C == 'L' || C == 'M';
+}
+
+static Cursor maybeLexHexFloatingPointLiteral(Cursor C, MIToken &Token) {
+  if (C.peek() != '0' || C.peek(1) != 'x')
+    return None;
+  Cursor Range = C;
+  C.advance(2); // Skip '0x'
+  if (isValidHexFloatingPointPrefix(C.peek()))
+    C.advance();
+  while (isxdigit(C.peek()))
+    C.advance();
+  Token.reset(MIToken::FloatingPointLiteral, Range.upto(C));
+  return C;
+}
+
+static Cursor lexFloatingPointLiteral(Cursor Range, Cursor C, MIToken &Token) {
+  C.advance();
+  // Skip over [0-9]*([eE][-+]?[0-9]+)?
+  while (isdigit(C.peek()))
+    C.advance();
+  if ((C.peek() == 'e' || C.peek() == 'E') &&
+      (isdigit(C.peek(1)) ||
+       ((C.peek(1) == '-' || C.peek(1) == '+') && isdigit(C.peek(2))))) {
+    C.advance(2);
+    while (isdigit(C.peek()))
+      C.advance();
+  }
+  Token.reset(MIToken::FloatingPointLiteral, Range.upto(C));
+  return C;
+}
+
+static Cursor maybeLexNumericalLiteral(Cursor C, MIToken &Token) {
+  if (!isdigit(C.peek()) && (C.peek() != '-' || !isdigit(C.peek(1))))
+    return None;
+  auto Range = C;
+  C.advance();
+  while (isdigit(C.peek()))
+    C.advance();
+  if (C.peek() == '.')
+    return lexFloatingPointLiteral(Range, C, Token);
+  StringRef StrVal = Range.upto(C);
+  Token.reset(MIToken::IntegerLiteral, StrVal).setIntegerValue(APSInt(StrVal));
+  return C;
+}
+
+static MIToken::TokenKind getMetadataKeywordKind(StringRef Identifier) {
+  return StringSwitch<MIToken::TokenKind>(Identifier)
+      .Case("!tbaa", MIToken::md_tbaa)
+      .Case("!alias.scope", MIToken::md_alias_scope)
+      .Case("!noalias", MIToken::md_noalias)
+      .Case("!range", MIToken::md_range)
+      .Default(MIToken::Error);
+}
+
+static Cursor maybeLexExlaim(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  if (C.peek() != '!')
+    return None;
+  auto Range = C;
+  C.advance(1);
+  if (isdigit(C.peek()) || !isIdentifierChar(C.peek())) {
+    Token.reset(MIToken::exclaim, Range.upto(C));
+    return C;
+  }
+  while (isIdentifierChar(C.peek()))
+    C.advance();
+  StringRef StrVal = Range.upto(C);
+  Token.reset(getMetadataKeywordKind(StrVal), StrVal);
+  if (Token.isError())
+    ErrorCallback(Token.location(),
+                  "use of unknown metadata keyword '" + StrVal + "'");
+  return C;
+}
+
+static MIToken::TokenKind symbolToken(char C) {
+  switch (C) {
+  case ',':
+    return MIToken::comma;
+  case '=':
+    return MIToken::equal;
+  case ':':
+    return MIToken::colon;
+  case '(':
+    return MIToken::lparen;
+  case ')':
+    return MIToken::rparen;
+  case '{':
+    return MIToken::lbrace;
+  case '}':
+    return MIToken::rbrace;
+  case '+':
+    return MIToken::plus;
+  case '-':
+    return MIToken::minus;
+  default:
+    return MIToken::Error;
+  }
+}
+
+static Cursor maybeLexSymbol(Cursor C, MIToken &Token) {
+  MIToken::TokenKind Kind;
+  unsigned Length = 1;
+  if (C.peek() == ':' && C.peek(1) == ':') {
+    Kind = MIToken::coloncolon;
+    Length = 2;
+  } else
+    Kind = symbolToken(C.peek());
+  if (Kind == MIToken::Error)
+    return None;
+  auto Range = C;
+  C.advance(Length);
+  Token.reset(Kind, Range.upto(C));
+  return C;
+}
+
+static Cursor maybeLexNewline(Cursor C, MIToken &Token) {
+  if (!isNewlineChar(C.peek()))
+    return None;
+  auto Range = C;
+  C.advance();
+  Token.reset(MIToken::Newline, Range.upto(C));
+  return C;
+}
+
+static Cursor maybeLexEscapedIRValue(
+    Cursor C, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  if (C.peek() != '`')
+    return None;
+  auto Range = C;
+  C.advance();
+  auto StrRange = C;
+  while (C.peek() != '`') {
+    if (C.isEOF() || isNewlineChar(C.peek())) {
+      ErrorCallback(
+          C.location(),
+          "end of machine instruction reached before the closing '`'");
+      Token.reset(MIToken::Error, Range.remaining());
+      return C;
+    }
+    C.advance();
+  }
+  StringRef Value = StrRange.upto(C);
+  C.advance();
+  Token.reset(MIToken::QuotedIRValue, Range.upto(C)).setStringValue(Value);
+  return C;
+}
+
+StringRef llvm::lexMIToken(
+    StringRef Source, MIToken &Token,
+    function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
+  auto C = skipComment(skipWhitespace(Cursor(Source)));
+  if (C.isEOF()) {
+    Token.reset(MIToken::Eof, C.remaining());
+    return C.remaining();
+  }
+
+  if (Cursor R = maybeLexIntegerType(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexMachineBasicBlock(C, Token, ErrorCallback))
+    return R.remaining();
+  if (Cursor R = maybeLexIdentifier(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexJumpTableIndex(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexStackObject(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexFixedStackObject(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexConstantPoolItem(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexIRBlock(C, Token, ErrorCallback))
+    return R.remaining();
+  if (Cursor R = maybeLexIRValue(C, Token, ErrorCallback))
+    return R.remaining();
+  if (Cursor R = maybeLexRegister(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexGlobalValue(C, Token, ErrorCallback))
+    return R.remaining();
+  if (Cursor R = maybeLexExternalSymbol(C, Token, ErrorCallback))
+    return R.remaining();
+  if (Cursor R = maybeLexHexFloatingPointLiteral(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexNumericalLiteral(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexExlaim(C, Token, ErrorCallback))
+    return R.remaining();
+  if (Cursor R = maybeLexSymbol(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexNewline(C, Token))
+    return R.remaining();
+  if (Cursor R = maybeLexEscapedIRValue(C, Token, ErrorCallback))
+    return R.remaining();
+
+  Token.reset(MIToken::Error, C.remaining());
+  ErrorCallback(C.location(),
+                Twine("unexpected character '") + Twine(C.peek()) + "'");
+  return C.remaining();
+}