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