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-rw-r--r--llvm/lib/CodeGen/MIRParser/MILexer.cpp736
1 files changed, 736 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/MIRParser/MILexer.cpp b/llvm/lib/CodeGen/MIRParser/MILexer.cpp
new file mode 100644
index 000000000000..4899bd3f5811
--- /dev/null
+++ b/llvm/lib/CodeGen/MIRParser/MILexer.cpp
@@ -0,0 +1,736 @@
+//===- MILexer.cpp - Machine instructions lexer implementation ------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+//
+// This file implements the lexing of machine instructions.
+//
+//===----------------------------------------------------------------------===//
+
+#include "MILexer.h"
+#include "llvm/ADT/APSInt.h"
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringExtras.h"
+#include "llvm/ADT/StringSwitch.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include <algorithm>
+#include <cassert>
+#include <cctype>
+#include <string>
+
+using namespace llvm;
+
+namespace {
+
+using ErrorCallbackType =
+ function_ref<void(StringRef::iterator Loc, const Twine &)>;
+
+/// This class provides a way to iterate and get characters from the source
+/// string.
+class Cursor {
+ const char *Ptr = nullptr;
+ const char *End = nullptr;
+
+public:
+ Cursor(NoneType) {}
+
+ 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, ErrorCallbackType 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, ErrorCallbackType 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 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("renamable", MIToken::kw_renamable)
+ .Case("tied-def", MIToken::kw_tied_def)
+ .Case("frame-setup", MIToken::kw_frame_setup)
+ .Case("frame-destroy", MIToken::kw_frame_destroy)
+ .Case("nnan", MIToken::kw_nnan)
+ .Case("ninf", MIToken::kw_ninf)
+ .Case("nsz", MIToken::kw_nsz)
+ .Case("arcp", MIToken::kw_arcp)
+ .Case("contract", MIToken::kw_contract)
+ .Case("afn", MIToken::kw_afn)
+ .Case("reassoc", MIToken::kw_reassoc)
+ .Case("nuw" , MIToken::kw_nuw)
+ .Case("nsw" , MIToken::kw_nsw)
+ .Case("exact" , MIToken::kw_exact)
+ .Case("fpexcept", MIToken::kw_fpexcept)
+ .Case("debug-location", MIToken::kw_debug_location)
+ .Case("same_value", MIToken::kw_cfi_same_value)
+ .Case("offset", MIToken::kw_cfi_offset)
+ .Case("rel_offset", MIToken::kw_cfi_rel_offset)
+ .Case("def_cfa_register", MIToken::kw_cfi_def_cfa_register)
+ .Case("def_cfa_offset", MIToken::kw_cfi_def_cfa_offset)
+ .Case("adjust_cfa_offset", MIToken::kw_cfi_adjust_cfa_offset)
+ .Case("escape", MIToken::kw_cfi_escape)
+ .Case("def_cfa", MIToken::kw_cfi_def_cfa)
+ .Case("remember_state", MIToken::kw_cfi_remember_state)
+ .Case("restore", MIToken::kw_cfi_restore)
+ .Case("restore_state", MIToken::kw_cfi_restore_state)
+ .Case("undefined", MIToken::kw_cfi_undefined)
+ .Case("register", MIToken::kw_cfi_register)
+ .Case("window_save", MIToken::kw_cfi_window_save)
+ .Case("negate_ra_sign_state", MIToken::kw_cfi_aarch64_negate_ra_sign_state)
+ .Case("blockaddress", MIToken::kw_blockaddress)
+ .Case("intrinsic", MIToken::kw_intrinsic)
+ .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("dereferenceable", MIToken::kw_dereferenceable)
+ .Case("invariant", MIToken::kw_invariant)
+ .Case("align", MIToken::kw_align)
+ .Case("addrspace", MIToken::kw_addrspace)
+ .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)
+ .Case("floatpred", MIToken::kw_floatpred)
+ .Case("intpred", MIToken::kw_intpred)
+ .Case("pre-instr-symbol", MIToken::kw_pre_instr_symbol)
+ .Case("post-instr-symbol", MIToken::kw_post_instr_symbol)
+ .Case("unknown-size", MIToken::kw_unknown_size)
+ .Default(MIToken::Identifier);
+}
+
+static Cursor maybeLexIdentifier(Cursor C, MIToken &Token) {
+ if (!isalpha(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,
+ ErrorCallbackType 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>'
+ // TODO: The format bb.<id>.<irname> is supported only when it's not a
+ // reference. Once we deprecate the format where the irname shows up, we
+ // should only lex forward if it is a reference.
+ 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 maybeLexSubRegisterIndex(Cursor C, MIToken &Token,
+ ErrorCallbackType ErrorCallback) {
+ const StringRef Rule = "%subreg.";
+ if (!C.remaining().startswith(Rule))
+ return None;
+ return lexName(C, Token, MIToken::SubRegisterIndex, Rule.size(),
+ ErrorCallback);
+}
+
+static Cursor maybeLexIRBlock(Cursor C, MIToken &Token,
+ ErrorCallbackType 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,
+ ErrorCallbackType 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 maybeLexStringConstant(Cursor C, MIToken &Token,
+ ErrorCallbackType ErrorCallback) {
+ if (C.peek() != '"')
+ return None;
+ return lexName(C, Token, MIToken::StringConstant, /*PrefixLength=*/0,
+ 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;
+}
+
+/// Returns true for a character allowed in a register name.
+static bool isRegisterChar(char C) {
+ return isIdentifierChar(C) && C != '.';
+}
+
+static Cursor lexNamedVirtualRegister(Cursor C, MIToken &Token) {
+ Cursor Range = C;
+ C.advance(); // Skip '%'
+ while (isRegisterChar(C.peek()))
+ C.advance();
+ Token.reset(MIToken::NamedVirtualRegister, Range.upto(C))
+ .setStringValue(Range.upto(C).drop_front(1)); // Drop the '%'
+ return C;
+}
+
+static Cursor maybeLexRegister(Cursor C, MIToken &Token,
+ ErrorCallbackType ErrorCallback) {
+ if (C.peek() != '%' && C.peek() != '$')
+ return None;
+
+ if (C.peek() == '%') {
+ if (isdigit(C.peek(1)))
+ return lexVirtualRegister(C, Token);
+
+ if (isRegisterChar(C.peek(1)))
+ return lexNamedVirtualRegister(C, Token);
+
+ return None;
+ }
+
+ assert(C.peek() == '$');
+ auto Range = C;
+ C.advance(); // Skip '$'
+ while (isRegisterChar(C.peek()))
+ C.advance();
+ Token.reset(MIToken::NamedRegister, Range.upto(C))
+ .setStringValue(Range.upto(C).drop_front(1)); // Drop the '$'
+ return C;
+}
+
+static Cursor maybeLexGlobalValue(Cursor C, MIToken &Token,
+ ErrorCallbackType 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,
+ ErrorCallbackType ErrorCallback) {
+ if (C.peek() != '&')
+ return None;
+ return lexName(C, Token, MIToken::ExternalSymbol, /*PrefixLength=*/1,
+ ErrorCallback);
+}
+
+static Cursor maybeLexMCSymbol(Cursor C, MIToken &Token,
+ ErrorCallbackType ErrorCallback) {
+ const StringRef Rule = "<mcsymbol ";
+ if (!C.remaining().startswith(Rule))
+ return None;
+ auto Start = C;
+ C.advance(Rule.size());
+
+ // Try a simple unquoted name.
+ if (C.peek() != '"') {
+ while (isIdentifierChar(C.peek()))
+ C.advance();
+ StringRef String = Start.upto(C).drop_front(Rule.size());
+ if (C.peek() != '>') {
+ ErrorCallback(C.location(),
+ "expected the '<mcsymbol ...' to be closed by a '>'");
+ Token.reset(MIToken::Error, Start.remaining());
+ return Start;
+ }
+ C.advance();
+
+ Token.reset(MIToken::MCSymbol, Start.upto(C)).setStringValue(String);
+ return C;
+ }
+
+ // Otherwise lex out a quoted name.
+ Cursor R = lexStringConstant(C, ErrorCallback);
+ if (!R) {
+ ErrorCallback(C.location(),
+ "unable to parse quoted string from opening quote");
+ Token.reset(MIToken::Error, Start.remaining());
+ return Start;
+ }
+ StringRef String = Start.upto(R).drop_front(Rule.size());
+ if (R.peek() != '>') {
+ ErrorCallback(R.location(),
+ "expected the '<mcsymbol ...' to be closed by a '>'");
+ Token.reset(MIToken::Error, Start.remaining());
+ return Start;
+ }
+ R.advance();
+
+ Token.reset(MIToken::MCSymbol, Start.upto(R))
+ .setOwnedStringValue(unescapeQuotedString(String));
+ return R;
+}
+
+static bool isValidHexFloatingPointPrefix(char C) {
+ return C == 'H' || C == 'K' || C == 'L' || C == 'M';
+}
+
+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 maybeLexHexadecimalLiteral(Cursor C, MIToken &Token) {
+ if (C.peek() != '0' || (C.peek(1) != 'x' && C.peek(1) != 'X'))
+ return None;
+ Cursor Range = C;
+ C.advance(2);
+ unsigned PrefLen = 2;
+ if (isValidHexFloatingPointPrefix(C.peek())) {
+ C.advance();
+ PrefLen++;
+ }
+ while (isxdigit(C.peek()))
+ C.advance();
+ StringRef StrVal = Range.upto(C);
+ if (StrVal.size() <= PrefLen)
+ return None;
+ if (PrefLen == 2)
+ Token.reset(MIToken::HexLiteral, Range.upto(C));
+ else // It must be 3, which means that there was a floating-point prefix.
+ 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)
+ .Case("!DIExpression", MIToken::md_diexpr)
+ .Case("!DILocation", MIToken::md_dilocation)
+ .Default(MIToken::Error);
+}
+
+static Cursor maybeLexExlaim(Cursor C, MIToken &Token,
+ ErrorCallbackType 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::dot;
+ 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;
+ case '<':
+ return MIToken::less;
+ case '>':
+ return MIToken::greater;
+ 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,
+ ErrorCallbackType 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,
+ ErrorCallbackType ErrorCallback) {
+ auto C = skipComment(skipWhitespace(Cursor(Source)));
+ if (C.isEOF()) {
+ Token.reset(MIToken::Eof, C.remaining());
+ return C.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 = maybeLexSubRegisterIndex(C, Token, ErrorCallback))
+ 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, ErrorCallback))
+ 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 = maybeLexMCSymbol(C, Token, ErrorCallback))
+ return R.remaining();
+ if (Cursor R = maybeLexHexadecimalLiteral(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();
+ if (Cursor R = maybeLexStringConstant(C, Token, ErrorCallback))
+ return R.remaining();
+
+ Token.reset(MIToken::Error, C.remaining());
+ ErrorCallback(C.location(),
+ Twine("unexpected character '") + Twine(C.peek()) + "'");
+ return C.remaining();
+}
generated by cgit v1.2.3 (git 2.25.1) at 2025-10-31 06:10:52 +0000