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llvm-project/llvm/lib/CodeGen/MIRParser/MILexer.cpp

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//===- 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();
}
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