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+//===- llvm/MC/MCAsmParser.h - Abstract Asm Parser Interface ----*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCPARSER_MCASMPARSER_H
+#define LLVM_MC_MCPARSER_MCASMPARSER_H
+
+#include "llvm/ADT/None.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCParser/MCAsmLexer.h"
+#include "llvm/Support/SMLoc.h"
+#include <cstdint>
+#include <string>
+#include <utility>
+
+namespace llvm {
+
+class MCAsmInfo;
+class MCAsmParserExtension;
+class MCContext;
+class MCExpr;
+class MCInstPrinter;
+class MCInstrInfo;
+class MCStreamer;
+class MCTargetAsmParser;
+class SourceMgr;
+
+struct InlineAsmIdentifierInfo {
+ enum IdKind {
+ IK_Invalid, // Initial state. Unexpected after a successful parsing.
+ IK_Label, // Function/Label reference.
+ IK_EnumVal, // Value of enumeration type.
+ IK_Var // Variable.
+ };
+ // Represents an Enum value
+ struct EnumIdentifier {
+ int64_t EnumVal;
+ };
+ // Represents a label/function reference
+ struct LabelIdentifier {
+ void *Decl;
+ };
+ // Represents a variable
+ struct VariableIdentifier {
+ void *Decl;
+ bool IsGlobalLV;
+ unsigned Length;
+ unsigned Size;
+ unsigned Type;
+ };
+ // An InlineAsm identifier can only be one of those
+ union {
+ EnumIdentifier Enum;
+ LabelIdentifier Label;
+ VariableIdentifier Var;
+ };
+ bool isKind(IdKind kind) const { return Kind == kind; }
+ // Initializers
+ void setEnum(int64_t enumVal) {
+ assert(isKind(IK_Invalid) && "should be initialized only once");
+ Kind = IK_EnumVal;
+ Enum.EnumVal = enumVal;
+ }
+ void setLabel(void *decl) {
+ assert(isKind(IK_Invalid) && "should be initialized only once");
+ Kind = IK_Label;
+ Label.Decl = decl;
+ }
+ void setVar(void *decl, bool isGlobalLV, unsigned size, unsigned type) {
+ assert(isKind(IK_Invalid) && "should be initialized only once");
+ Kind = IK_Var;
+ Var.Decl = decl;
+ Var.IsGlobalLV = isGlobalLV;
+ Var.Size = size;
+ Var.Type = type;
+ Var.Length = size / type;
+ }
+ InlineAsmIdentifierInfo() : Kind(IK_Invalid) {}
+
+private:
+ // Discriminate using the current kind.
+ IdKind Kind;
+};
+
+/// \brief Generic Sema callback for assembly parser.
+class MCAsmParserSemaCallback {
+public:
+ virtual ~MCAsmParserSemaCallback();
+
+ virtual void LookupInlineAsmIdentifier(StringRef &LineBuf,
+ InlineAsmIdentifierInfo &Info,
+ bool IsUnevaluatedContext) = 0;
+ virtual StringRef LookupInlineAsmLabel(StringRef Identifier, SourceMgr &SM,
+ SMLoc Location, bool Create) = 0;
+ virtual bool LookupInlineAsmField(StringRef Base, StringRef Member,
+ unsigned &Offset) = 0;
+};
+
+/// \brief Generic assembler parser interface, for use by target specific
+/// assembly parsers.
+class MCAsmParser {
+public:
+ using DirectiveHandler = bool (*)(MCAsmParserExtension*, StringRef, SMLoc);
+ using ExtensionDirectiveHandler =
+ std::pair<MCAsmParserExtension*, DirectiveHandler>;
+
+ struct MCPendingError {
+ SMLoc Loc;
+ SmallString<64> Msg;
+ SMRange Range;
+ };
+
+private:
+ MCTargetAsmParser *TargetParser = nullptr;
+
+ unsigned ShowParsedOperands : 1;
+
+protected: // Can only create subclasses.
+ MCAsmParser();
+
+ /// Flag tracking whether any errors have been encountered.
+ bool HadError = false;
+ /// Enable print [latency:throughput] in output file.
+ bool EnablePrintSchedInfo = false;
+
+ SmallVector<MCPendingError, 1> PendingErrors;
+
+public:
+ MCAsmParser(const MCAsmParser &) = delete;
+ MCAsmParser &operator=(const MCAsmParser &) = delete;
+ virtual ~MCAsmParser();
+
+ virtual void addDirectiveHandler(StringRef Directive,
+ ExtensionDirectiveHandler Handler) = 0;
+
+ virtual void addAliasForDirective(StringRef Directive, StringRef Alias) = 0;
+
+ virtual SourceMgr &getSourceManager() = 0;
+
+ virtual MCAsmLexer &getLexer() = 0;
+ const MCAsmLexer &getLexer() const {
+ return const_cast<MCAsmParser*>(this)->getLexer();
+ }
+
+ virtual MCContext &getContext() = 0;
+
+ /// \brief Return the output streamer for the assembler.
+ virtual MCStreamer &getStreamer() = 0;
+
+ MCTargetAsmParser &getTargetParser() const { return *TargetParser; }
+ void setTargetParser(MCTargetAsmParser &P);
+
+ virtual unsigned getAssemblerDialect() { return 0;}
+ virtual void setAssemblerDialect(unsigned i) { }
+
+ bool getShowParsedOperands() const { return ShowParsedOperands; }
+ void setShowParsedOperands(bool Value) { ShowParsedOperands = Value; }
+
+ void setEnablePrintSchedInfo(bool Value) { EnablePrintSchedInfo = Value; }
+ bool shouldPrintSchedInfo() { return EnablePrintSchedInfo; }
+
+ /// \brief Run the parser on the input source buffer.
+ virtual bool Run(bool NoInitialTextSection, bool NoFinalize = false) = 0;
+
+ virtual void setParsingInlineAsm(bool V) = 0;
+ virtual bool isParsingInlineAsm() = 0;
+
+ /// \brief Parse MS-style inline assembly.
+ virtual bool parseMSInlineAsm(
+ void *AsmLoc, std::string &AsmString, unsigned &NumOutputs,
+ unsigned &NumInputs, SmallVectorImpl<std::pair<void *, bool>> &OpDecls,
+ SmallVectorImpl<std::string> &Constraints,
+ SmallVectorImpl<std::string> &Clobbers, const MCInstrInfo *MII,
+ const MCInstPrinter *IP, MCAsmParserSemaCallback &SI) = 0;
+
+ /// \brief Emit a note at the location \p L, with the message \p Msg.
+ virtual void Note(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
+
+ /// \brief Emit a warning at the location \p L, with the message \p Msg.
+ ///
+ /// \return The return value is true, if warnings are fatal.
+ virtual bool Warning(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
+
+ /// \brief Return an error at the location \p L, with the message \p Msg. This
+ /// may be modified before being emitted.
+ ///
+ /// \return The return value is always true, as an idiomatic convenience to
+ /// clients.
+ bool Error(SMLoc L, const Twine &Msg, SMRange Range = None);
+
+ /// \brief Emit an error at the location \p L, with the message \p Msg.
+ ///
+ /// \return The return value is always true, as an idiomatic convenience to
+ /// clients.
+ virtual bool printError(SMLoc L, const Twine &Msg, SMRange Range = None) = 0;
+
+ bool hasPendingError() { return !PendingErrors.empty(); }
+
+ bool printPendingErrors() {
+ bool rv = !PendingErrors.empty();
+ for (auto Err : PendingErrors) {
+ printError(Err.Loc, Twine(Err.Msg), Err.Range);
+ }
+ PendingErrors.clear();
+ return rv;
+ }
+
+ bool addErrorSuffix(const Twine &Suffix);
+
+ /// \brief Get the next AsmToken in the stream, possibly handling file
+ /// inclusion first.
+ virtual const AsmToken &Lex() = 0;
+
+ /// \brief Get the current AsmToken from the stream.
+ const AsmToken &getTok() const;
+
+ /// \brief Report an error at the current lexer location.
+ bool TokError(const Twine &Msg, SMRange Range = None);
+
+ bool parseTokenLoc(SMLoc &Loc);
+ bool parseToken(AsmToken::TokenKind T, const Twine &Msg = "unexpected token");
+ /// \brief Attempt to parse and consume token, returning true on
+ /// success.
+ bool parseOptionalToken(AsmToken::TokenKind T);
+
+ bool parseEOL(const Twine &ErrMsg);
+
+ bool parseMany(function_ref<bool()> parseOne, bool hasComma = true);
+
+ bool parseIntToken(int64_t &V, const Twine &ErrMsg);
+
+ bool check(bool P, const Twine &Msg);
+ bool check(bool P, SMLoc Loc, const Twine &Msg);
+
+ /// \brief Parse an identifier or string (as a quoted identifier) and set \p
+ /// Res to the identifier contents.
+ virtual bool parseIdentifier(StringRef &Res) = 0;
+
+ /// \brief Parse up to the end of statement and return the contents from the
+ /// current token until the end of the statement; the current token on exit
+ /// will be either the EndOfStatement or EOF.
+ virtual StringRef parseStringToEndOfStatement() = 0;
+
+ /// \brief Parse the current token as a string which may include escaped
+ /// characters and return the string contents.
+ virtual bool parseEscapedString(std::string &Data) = 0;
+
+ /// \brief Skip to the end of the current statement, for error recovery.
+ virtual void eatToEndOfStatement() = 0;
+
+ /// \brief Parse an arbitrary expression.
+ ///
+ /// \param Res - The value of the expression. The result is undefined
+ /// on error.
+ /// \return - False on success.
+ virtual bool parseExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
+ bool parseExpression(const MCExpr *&Res);
+
+ /// \brief Parse a primary expression.
+ ///
+ /// \param Res - The value of the expression. The result is undefined
+ /// on error.
+ /// \return - False on success.
+ virtual bool parsePrimaryExpr(const MCExpr *&Res, SMLoc &EndLoc) = 0;
+
+ /// \brief Parse an arbitrary expression, assuming that an initial '(' has
+ /// already been consumed.
+ ///
+ /// \param Res - The value of the expression. The result is undefined
+ /// on error.
+ /// \return - False on success.
+ virtual bool parseParenExpression(const MCExpr *&Res, SMLoc &EndLoc) = 0;
+
+ /// \brief Parse an expression which must evaluate to an absolute value.
+ ///
+ /// \param Res - The value of the absolute expression. The result is undefined
+ /// on error.
+ /// \return - False on success.
+ virtual bool parseAbsoluteExpression(int64_t &Res) = 0;
+
+ /// \brief Ensure that we have a valid section set in the streamer. Otherwise,
+ /// report an error and switch to .text.
+ /// \return - False on success.
+ virtual bool checkForValidSection() = 0;
+
+ /// \brief Parse an arbitrary expression of a specified parenthesis depth,
+ /// assuming that the initial '(' characters have already been consumed.
+ ///
+ /// \param ParenDepth - Specifies how many trailing expressions outside the
+ /// current parentheses we have to parse.
+ /// \param Res - The value of the expression. The result is undefined
+ /// on error.
+ /// \return - False on success.
+ virtual bool parseParenExprOfDepth(unsigned ParenDepth, const MCExpr *&Res,
+ SMLoc &EndLoc) = 0;
+};
+
+/// \brief Create an MCAsmParser instance.
+MCAsmParser *createMCAsmParser(SourceMgr &, MCContext &, MCStreamer &,
+ const MCAsmInfo &, unsigned CB = 0);
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCPARSER_MCASMPARSER_H