2015-06-23 04:37:46 +08:00
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//===- 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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2015-07-21 04:31:01 +08:00
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#include "llvm/ADT/StringExtras.h"
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2015-07-07 07:07:26 +08:00
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#include "llvm/ADT/StringSwitch.h"
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2015-06-23 04:37:46 +08:00
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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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2015-07-01 00:51:29 +08:00
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Cursor(NoneType) : Ptr(nullptr), End(nullptr) {}
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2015-06-23 04:37:46 +08:00
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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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2015-06-24 14:40:09 +08:00
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char peek(int I = 0) const { return End - Ptr <= I ? 0 : Ptr[I]; }
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2015-06-27 00:46:11 +08:00
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void advance(unsigned I = 1) { Ptr += I; }
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2015-06-23 04:37:46 +08:00
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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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2015-06-23 04:37:46 +08:00
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};
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} // end anonymous namespace
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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 (isspace(C.peek()))
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C.advance();
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return C;
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}
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2015-07-18 06:48:04 +08:00
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/// Return true if the given character satisfies the following regular
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/// expression: [-a-zA-Z$._0-9]
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2015-06-23 04:37:46 +08:00
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static bool isIdentifierChar(char C) {
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return isalpha(C) || isdigit(C) || C == '_' || C == '-' || C == '.' ||
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C == '$';
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2015-06-23 04:37:46 +08:00
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}
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2015-07-21 04:31:01 +08:00
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void MIToken::unescapeQuotedStringValue(std::string &Str) const {
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assert(isStringValueQuoted() && "String value isn't quoted");
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StringRef Value = Range.drop_front(StringOffset);
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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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Str.clear();
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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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}
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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()) {
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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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2015-07-07 07:07:26 +08:00
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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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2015-07-08 04:34:53 +08:00
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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("frame-setup", MIToken::kw_frame_setup)
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.Case("debug-location", MIToken::kw_debug_location)
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.Case(".cfi_offset", MIToken::kw_cfi_offset)
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2015-07-22 06:28:27 +08:00
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.Case(".cfi_def_cfa_offset", MIToken::kw_cfi_def_cfa_offset)
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.Default(MIToken::Identifier);
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}
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2015-07-01 00:51:29 +08:00
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static Cursor maybeLexIdentifier(Cursor C, MIToken &Token) {
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2015-07-22 06:28:27 +08:00
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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 = MIToken(getIdentifierKind(Identifier), Identifier);
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return C;
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}
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2015-07-01 00:51:29 +08:00
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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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if (!C.remaining().startswith("%bb."))
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return None;
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2015-06-27 00:46:11 +08:00
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auto Range = C;
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C.advance(4); // Skip '%bb.'
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if (!isdigit(C.peek())) {
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Token = MIToken(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 = 4 + 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 = MIToken(MIToken::MachineBasicBlock, Range.upto(C), APSInt(Number),
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StringOffset);
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return C;
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}
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2015-07-16 07:38:35 +08:00
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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 = MIToken(Kind, Range.upto(C), APSInt(NumberRange.upto(C)));
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return C;
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}
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2015-07-17 07:37:45 +08:00
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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 = MIToken(Kind, Range.upto(C), APSInt(Number), StringOffset);
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return C;
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}
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2015-07-16 07:38:35 +08:00
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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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2015-07-17 07:37:45 +08:00
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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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2015-07-21 04:51:18 +08:00
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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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2015-07-11 06:51:20 +08:00
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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 = MIToken(MIToken::VirtualRegister, Range.upto(C),
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APSInt(NumberRange.upto(C)));
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return C;
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}
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2015-07-01 00:51:29 +08:00
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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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2015-07-11 06:51:20 +08:00
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if (isdigit(C.peek(1)))
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return lexVirtualRegister(C, Token);
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2015-06-24 00:35:26 +08:00
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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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2015-06-27 00:46:11 +08:00
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Token = MIToken(MIToken::NamedRegister, Range.upto(C),
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/*StringOffset=*/1); // Drop the '%'
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2015-06-24 00:35:26 +08:00
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return C;
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}
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2015-07-22 00:59:53 +08:00
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static Cursor lexName(
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Cursor C, MIToken &Token, MIToken::TokenKind Type,
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MIToken::TokenKind QuotedType, 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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Token = MIToken(QuotedType, Range.upto(R), PrefixLength);
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return R;
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}
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Token = MIToken(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 = MIToken(Type, Range.upto(C), PrefixLength);
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return C;
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}
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2015-07-22 05:23:08 +08:00
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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,
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MIToken::QuotedNamedGlobalValue, /*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 =
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MIToken(MIToken::GlobalValue, Range.upto(C), APSInt(NumberRange.upto(C)));
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return C;
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}
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2015-07-22 00:59:53 +08:00
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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,
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MIToken::QuotedExternalSymbol,
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/*PrefixLength=*/1, ErrorCallback);
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}
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2015-07-01 00:51:29 +08:00
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static Cursor maybeLexIntegerLiteral(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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2015-06-24 07:42:28 +08:00
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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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StringRef StrVal = Range.upto(C);
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Token = MIToken(MIToken::IntegerLiteral, StrVal, APSInt(StrVal));
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return C;
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}
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2015-06-24 00:35:26 +08:00
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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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2015-07-14 07:24:34 +08:00
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case ':':
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return MIToken::colon;
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2015-07-23 01:58:46 +08:00
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case '!':
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return MIToken::exclaim;
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2015-06-24 00:35:26 +08:00
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default:
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return MIToken::Error;
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}
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}
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2015-07-01 00:51:29 +08:00
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static Cursor maybeLexSymbol(Cursor C, MIToken &Token) {
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auto Kind = symbolToken(C.peek());
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if (Kind == MIToken::Error)
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return None;
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2015-06-24 00:35:26 +08:00
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auto Range = C;
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C.advance();
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Token = MIToken(Kind, Range.upto(C));
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return C;
|
|
|
|
}
|
|
|
|
|
2015-06-23 04:37:46 +08:00
|
|
|
StringRef llvm::lexMIToken(
|
|
|
|
StringRef Source, MIToken &Token,
|
|
|
|
function_ref<void(StringRef::iterator Loc, const Twine &)> ErrorCallback) {
|
|
|
|
auto C = skipWhitespace(Cursor(Source));
|
|
|
|
if (C.isEOF()) {
|
|
|
|
Token = MIToken(MIToken::Eof, C.remaining());
|
|
|
|
return C.remaining();
|
|
|
|
}
|
|
|
|
|
2015-07-01 00:51:29 +08:00
|
|
|
if (Cursor R = maybeLexIdentifier(C, Token))
|
|
|
|
return R.remaining();
|
|
|
|
if (Cursor R = maybeLexMachineBasicBlock(C, Token, ErrorCallback))
|
|
|
|
return R.remaining();
|
2015-07-16 07:38:35 +08:00
|
|
|
if (Cursor R = maybeLexJumpTableIndex(C, Token))
|
|
|
|
return R.remaining();
|
2015-07-17 07:37:45 +08:00
|
|
|
if (Cursor R = maybeLexStackObject(C, Token))
|
|
|
|
return R.remaining();
|
|
|
|
if (Cursor R = maybeLexFixedStackObject(C, Token))
|
|
|
|
return R.remaining();
|
2015-07-21 04:51:18 +08:00
|
|
|
if (Cursor R = maybeLexConstantPoolItem(C, Token))
|
|
|
|
return R.remaining();
|
2015-07-01 00:51:29 +08:00
|
|
|
if (Cursor R = maybeLexRegister(C, Token))
|
|
|
|
return R.remaining();
|
2015-07-21 04:31:01 +08:00
|
|
|
if (Cursor R = maybeLexGlobalValue(C, Token, ErrorCallback))
|
2015-07-01 00:51:29 +08:00
|
|
|
return R.remaining();
|
2015-07-22 00:59:53 +08:00
|
|
|
if (Cursor R = maybeLexExternalSymbol(C, Token, ErrorCallback))
|
|
|
|
return R.remaining();
|
2015-07-01 00:51:29 +08:00
|
|
|
if (Cursor R = maybeLexIntegerLiteral(C, Token))
|
|
|
|
return R.remaining();
|
|
|
|
if (Cursor R = maybeLexSymbol(C, Token))
|
|
|
|
return R.remaining();
|
|
|
|
|
2015-06-23 04:37:46 +08:00
|
|
|
Token = MIToken(MIToken::Error, C.remaining());
|
|
|
|
ErrorCallback(C.location(),
|
2015-07-01 00:51:29 +08:00
|
|
|
Twine("unexpected character '") + Twine(C.peek()) + "'");
|
2015-06-23 04:37:46 +08:00
|
|
|
return C.remaining();
|
|
|
|
}
|