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Properly encapsulate additional methods and data from AsmParser.

This finally allows AsmParser to no longer list GenericAsmParser as a friend.
All member vars directly accessed by GenericAsmParser have been properly
encapsulated and exposed through the MCAsmParser interface. This reduces the
coupling between AsmParser and GenericAsmParser.

llvm-svn: 172490
This commit is contained in:
Eli Bendersky 2013-01-14 23:22:36 +00:00
parent 24a461467e
commit d065fef2d9
2 changed files with 115 additions and 68 deletions

View File

@ -11,6 +11,7 @@
#define LLVM_MC_MCPARSER_MCASMPARSER_H
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/MC/MCParser/AsmLexer.h"
#include "llvm/Support/DataTypes.h"
#include <vector>
@ -43,8 +44,24 @@ public:
};
/// \brief Helper types for tracking macro definitions.
typedef std::vector<AsmToken> MCAsmMacroArgument;
typedef std::vector<MCAsmMacroArgument> MCAsmMacroArguments;
typedef std::pair<StringRef, MCAsmMacroArgument> MCAsmMacroParameter;
typedef std::vector<MCAsmMacroParameter> MCAsmMacroParameters;
struct MCAsmMacro {
StringRef Name;
StringRef Body;
MCAsmMacroParameters Parameters;
public:
MCAsmMacro(StringRef N, StringRef B, const MCAsmMacroParameters &P) :
Name(N), Body(B), Parameters(P) {}
MCAsmMacro(const MCAsmMacro& Other)
: Name(Other.Name), Body(Other.Body), Parameters(Other.Parameters) {}
};
/// MCAsmParser - Generic assembler parser interface, for use by target specific
/// assembly parsers.
@ -141,10 +158,35 @@ public:
/// recovery.
virtual void EatToEndOfStatement() = 0;
/// Control a flag in the parser that enables or disables macros.
/// \brief Are macros enabled in the parser?
virtual bool MacrosEnabled() = 0;
/// \brief Control a flag in the parser that enables or disables macros.
virtual void SetMacrosEnabled(bool flag) = 0;
/// \brief Lookup a previously defined macro.
/// \param Name Macro name.
/// \returns Pointer to macro. NULL if no such macro was defined.
virtual const MCAsmMacro* LookupMacro(StringRef Name) = 0;
/// \brief Define a new macro with the given name and information.
virtual void DefineMacro(StringRef Name, const MCAsmMacro& Macro) = 0;
/// \brief Undefine a macro. If no such macro was defined, it's a no-op.
virtual void UndefineMacro(StringRef Name) = 0;
/// \brief Are we inside a macro instantiation?
virtual bool InsideMacroInstantiation() = 0;
/// \brief Handle entry to macro instantiation.
///
/// \param M The macro.
/// \param NameLoc Instantiation location.
virtual bool HandleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) = 0;
/// \brief Handle exit from macro instantiation.
virtual void HandleMacroExit() = 0;
/// ParseMacroArgument - Extract AsmTokens for a macro argument. If the
/// argument delimiter is initially unknown, set it to AsmToken::Eof. It will
/// be set to the correct delimiter by the method.

View File

@ -50,26 +50,12 @@ MCAsmParserSemaCallback::~MCAsmParserSemaCallback() {}
namespace {
/// \brief Helper class for tracking macro definitions.
typedef std::vector<MCAsmMacroArgument> MacroArguments;
typedef std::pair<StringRef, MCAsmMacroArgument> MacroParameter;
typedef std::vector<MacroParameter> MacroParameters;
struct Macro {
StringRef Name;
StringRef Body;
MacroParameters Parameters;
public:
Macro(StringRef N, StringRef B, const MacroParameters &P) :
Name(N), Body(B), Parameters(P) {}
};
/// \brief Helper class for storing information about an active macro
/// instantiation.
struct MacroInstantiation {
/// The macro being instantiated.
const Macro *TheMacro;
const MCAsmMacro *TheMacro;
/// The macro instantiation with substitutions.
MemoryBuffer *Instantiation;
@ -84,7 +70,7 @@ struct MacroInstantiation {
SMLoc ExitLoc;
public:
MacroInstantiation(const Macro *M, SMLoc IL, int EB, SMLoc EL,
MacroInstantiation(const MCAsmMacro *M, SMLoc IL, int EB, SMLoc EL,
MemoryBuffer *I);
};
@ -115,8 +101,6 @@ struct ParseStatementInfo {
/// \brief The concrete assembly parser instance.
class AsmParser : public MCAsmParser {
friend class GenericAsmParser;
AsmParser(const AsmParser &) LLVM_DELETED_FUNCTION;
void operator=(const AsmParser &) LLVM_DELETED_FUNCTION;
private:
@ -144,7 +128,7 @@ private:
StringMap<std::pair<MCAsmParserExtension*, DirectiveHandler> > DirectiveMap;
/// MacroMap - Map of currently defined macros.
StringMap<Macro*> MacroMap;
StringMap<MCAsmMacro*> MacroMap;
/// ActiveMacros - Stack of active macro instantiations.
std::vector<MacroInstantiation*> ActiveMacros;
@ -225,6 +209,9 @@ public:
virtual bool ParseParenExpression(const MCExpr *&Res, SMLoc &EndLoc);
virtual bool ParseAbsoluteExpression(int64_t &Res);
bool ParseMacroArgument(MCAsmMacroArgument &MA,
AsmToken::TokenKind &ArgumentDelimiter);
/// ParseIdentifier - Parse an identifier or string (as a quoted identifier)
/// and set \p Res to the identifier contents.
virtual bool ParseIdentifier(StringRef &Res);
@ -233,6 +220,14 @@ public:
virtual bool MacrosEnabled() {return MacrosEnabledFlag;}
virtual void SetMacrosEnabled(bool flag) {MacrosEnabledFlag = flag;}
virtual const MCAsmMacro* LookupMacro(StringRef Name);
virtual void DefineMacro(StringRef Name, const MCAsmMacro& Macro);
virtual void UndefineMacro(StringRef Name);
virtual bool InsideMacroInstantiation() {return !ActiveMacros.empty();}
virtual bool HandleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc);
void HandleMacroExit();
virtual void CheckForValidSection();
/// }
@ -242,12 +237,10 @@ private:
void EatToEndOfLine();
bool ParseCppHashLineFilenameComment(const SMLoc &L);
bool HandleMacroEntry(StringRef Name, SMLoc NameLoc, const Macro *M);
bool expandMacro(raw_svector_ostream &OS, StringRef Body,
const MacroParameters &Parameters,
const MacroArguments &A,
const MCAsmMacroParameters &Parameters,
const MCAsmMacroArguments &A,
const SMLoc &L);
void HandleMacroExit();
void PrintMacroInstantiations();
void PrintMessage(SMLoc Loc, SourceMgr::DiagKind Kind, const Twine &Msg,
@ -270,9 +263,7 @@ private:
/// location.
void JumpToLoc(SMLoc Loc, int InBuffer=-1);
bool ParseMacroArgument(MCAsmMacroArgument &MA,
AsmToken::TokenKind &ArgumentDelimiter);
bool ParseMacroArguments(const Macro *M, MacroArguments &A);
bool ParseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A);
/// \brief Parse up to the end of statement and a return the contents from the
/// current token until the end of the statement; the current token on exit
@ -359,8 +350,8 @@ private:
MCSymbolRefExpr::VariantKind Variant);
// Macro-like directives
Macro *ParseMacroLikeBody(SMLoc DirectiveLoc);
void InstantiateMacroLikeBody(Macro *M, SMLoc DirectiveLoc,
MCAsmMacro *ParseMacroLikeBody(SMLoc DirectiveLoc);
void InstantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
raw_svector_ostream &OS);
bool ParseDirectiveRept(SMLoc DirectiveLoc); // ".rept"
bool ParseDirectiveIrp(SMLoc DirectiveLoc); // ".irp"
@ -540,7 +531,7 @@ AsmParser::~AsmParser() {
assert(ActiveMacros.empty() && "Unexpected active macro instantiation!");
// Destroy any macros.
for (StringMap<Macro*>::iterator it = MacroMap.begin(),
for (StringMap<MCAsmMacro*>::iterator it = MacroMap.begin(),
ie = MacroMap.end(); it != ie; ++it)
delete it->getValue();
@ -1278,8 +1269,9 @@ bool AsmParser::ParseStatement(ParseStatementInfo &Info) {
// If macros are enabled, check to see if this is a macro instantiation.
if (MacrosEnabled())
if (const Macro *M = MacroMap.lookup(IDVal))
return HandleMacroEntry(IDVal, IDLoc, M);
if (const MCAsmMacro *M = LookupMacro(IDVal)) {
return HandleMacroEntry(M, IDLoc);
}
// Otherwise, we have a normal instruction or directive.
if (IDVal[0] == '.' && IDVal != ".") {
@ -1590,8 +1582,8 @@ static bool isIdentifierChar(char c) {
}
bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
const MacroParameters &Parameters,
const MacroArguments &A,
const MCAsmMacroParameters &Parameters,
const MCAsmMacroArguments &A,
const SMLoc &L) {
unsigned NParameters = Parameters.size();
if (NParameters != 0 && NParameters != A.size())
@ -1690,7 +1682,7 @@ bool AsmParser::expandMacro(raw_svector_ostream &OS, StringRef Body,
return false;
}
MacroInstantiation::MacroInstantiation(const Macro *M, SMLoc IL,
MacroInstantiation::MacroInstantiation(const MCAsmMacro *M, SMLoc IL,
int EB, SMLoc EL,
MemoryBuffer *I)
: TheMacro(M), Instantiation(I), InstantiationLoc(IL), ExitBuffer(EB),
@ -1807,7 +1799,7 @@ bool AsmParser::ParseMacroArgument(MCAsmMacroArgument &MA,
}
// Parse the macro instantiation arguments.
bool AsmParser::ParseMacroArguments(const Macro *M, MacroArguments &A) {
bool AsmParser::ParseMacroArguments(const MCAsmMacro *M, MCAsmMacroArguments &A) {
const unsigned NParameters = M ? M->Parameters.size() : 0;
// Argument delimiter is initially unknown. It will be set by
// ParseMacroArgument()
@ -1851,14 +1843,30 @@ bool AsmParser::ParseMacroArguments(const Macro *M, MacroArguments &A) {
return TokError("Too many arguments");
}
bool AsmParser::HandleMacroEntry(StringRef Name, SMLoc NameLoc,
const Macro *M) {
const MCAsmMacro* AsmParser::LookupMacro(StringRef Name) {
StringMap<MCAsmMacro*>::iterator I = MacroMap.find(Name);
return (I == MacroMap.end()) ? NULL : I->getValue();
}
void AsmParser::DefineMacro(StringRef Name, const MCAsmMacro& Macro) {
MacroMap[Name] = new MCAsmMacro(Macro);
}
void AsmParser::UndefineMacro(StringRef Name) {
StringMap<MCAsmMacro*>::iterator I = MacroMap.find(Name);
if (I != MacroMap.end()) {
delete I->getValue();
MacroMap.erase(I);
}
}
bool AsmParser::HandleMacroEntry(const MCAsmMacro *M, SMLoc NameLoc) {
// Arbitrarily limit macro nesting depth, to match 'as'. We can eliminate
// this, although we should protect against infinite loops.
if (ActiveMacros.size() == 20)
return TokError("macros cannot be nested more than 20 levels deep");
MacroArguments A;
MCAsmMacroArguments A;
if (ParseMacroArguments(M, A))
return true;
@ -1877,7 +1885,7 @@ bool AsmParser::HandleMacroEntry(StringRef Name, SMLoc NameLoc,
if (expandMacro(OS, Body, M->Parameters, A, getTok().getLoc()))
return true;
// We include the .endmacro in the buffer as our queue to exit the macro
// We include the .endmacro in the buffer as our cue to exit the macro
// instantiation.
OS << ".endmacro\n";
@ -3498,13 +3506,13 @@ bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive,
if (getParser().ParseIdentifier(Name))
return TokError("expected identifier in '.macro' directive");
MacroParameters Parameters;
MCAsmMacroParameters Parameters;
// Argument delimiter is initially unknown. It will be set by
// ParseMacroArgument()
AsmToken::TokenKind ArgumentDelimiter = AsmToken::Eof;
if (getLexer().isNot(AsmToken::EndOfStatement)) {
for (;;) {
MacroParameter Parameter;
MCAsmMacroParameter Parameter;
if (getParser().ParseIdentifier(Parameter.first))
return TokError("expected identifier in '.macro' directive");
@ -3550,14 +3558,14 @@ bool GenericAsmParser::ParseDirectiveMacro(StringRef Directive,
getParser().EatToEndOfStatement();
}
if (getParser().MacroMap.lookup(Name)) {
if (getParser().LookupMacro(Name)) {
return Error(DirectiveLoc, "macro '" + Name + "' is already defined");
}
const char *BodyStart = StartToken.getLoc().getPointer();
const char *BodyEnd = EndToken.getLoc().getPointer();
StringRef Body = StringRef(BodyStart, BodyEnd - BodyStart);
getParser().MacroMap[Name] = new Macro(Name, Body, Parameters);
getParser().DefineMacro(Name, MCAsmMacro(Name, Body, Parameters));
return false;
}
@ -3571,7 +3579,7 @@ bool GenericAsmParser::ParseDirectiveEndMacro(StringRef Directive,
// If we are inside a macro instantiation, terminate the current
// instantiation.
if (!getParser().ActiveMacros.empty()) {
if (getParser().InsideMacroInstantiation()) {
getParser().HandleMacroExit();
return false;
}
@ -3593,13 +3601,10 @@ bool GenericAsmParser::ParseDirectivePurgeMacro(StringRef Directive,
if (getLexer().isNot(AsmToken::EndOfStatement))
return TokError("unexpected token in '.purgem' directive");
StringMap<Macro*>::iterator I = getParser().MacroMap.find(Name);
if (I == getParser().MacroMap.end())
if (!getParser().LookupMacro(Name))
return Error(DirectiveLoc, "macro '" + Name + "' is not defined");
// Undefine the macro.
delete I->getValue();
getParser().MacroMap.erase(I);
getParser().UndefineMacro(Name);
return false;
}
@ -3622,7 +3627,7 @@ bool GenericAsmParser::ParseDirectiveLEB128(StringRef DirName, SMLoc) {
return false;
}
Macro *AsmParser::ParseMacroLikeBody(SMLoc DirectiveLoc) {
MCAsmMacro *AsmParser::ParseMacroLikeBody(SMLoc DirectiveLoc) {
AsmToken EndToken, StartToken = getTok();
unsigned NestLevel = 0;
@ -3663,11 +3668,11 @@ Macro *AsmParser::ParseMacroLikeBody(SMLoc DirectiveLoc) {
// We Are Anonymous.
StringRef Name;
MacroParameters Parameters;
return new Macro(Name, Body, Parameters);
MCAsmMacroParameters Parameters;
return new MCAsmMacro(Name, Body, Parameters);
}
void AsmParser::InstantiateMacroLikeBody(Macro *M, SMLoc DirectiveLoc,
void AsmParser::InstantiateMacroLikeBody(MCAsmMacro *M, SMLoc DirectiveLoc,
raw_svector_ostream &OS) {
OS << ".endr\n";
@ -3703,15 +3708,15 @@ bool AsmParser::ParseDirectiveRept(SMLoc DirectiveLoc) {
Lex();
// Lex the rept definition.
Macro *M = ParseMacroLikeBody(DirectiveLoc);
MCAsmMacro *M = ParseMacroLikeBody(DirectiveLoc);
if (!M)
return true;
// Macro instantiation is lexical, unfortunately. We construct a new buffer
// to hold the macro body with substitutions.
SmallString<256> Buf;
MacroParameters Parameters;
MacroArguments A;
MCAsmMacroParameters Parameters;
MCAsmMacroArguments A;
raw_svector_ostream OS(Buf);
while (Count--) {
if (expandMacro(OS, M->Body, Parameters, A, getTok().getLoc()))
@ -3725,8 +3730,8 @@ bool AsmParser::ParseDirectiveRept(SMLoc DirectiveLoc) {
/// ParseDirectiveIrp
/// ::= .irp symbol,values
bool AsmParser::ParseDirectiveIrp(SMLoc DirectiveLoc) {
MacroParameters Parameters;
MacroParameter Parameter;
MCAsmMacroParameters Parameters;
MCAsmMacroParameter Parameter;
if (ParseIdentifier(Parameter.first))
return TokError("expected identifier in '.irp' directive");
@ -3738,7 +3743,7 @@ bool AsmParser::ParseDirectiveIrp(SMLoc DirectiveLoc) {
Lex();
MacroArguments A;
MCAsmMacroArguments A;
if (ParseMacroArguments(0, A))
return true;
@ -3746,7 +3751,7 @@ bool AsmParser::ParseDirectiveIrp(SMLoc DirectiveLoc) {
Lex();
// Lex the irp definition.
Macro *M = ParseMacroLikeBody(DirectiveLoc);
MCAsmMacro *M = ParseMacroLikeBody(DirectiveLoc);
if (!M)
return true;
@ -3755,8 +3760,8 @@ bool AsmParser::ParseDirectiveIrp(SMLoc DirectiveLoc) {
SmallString<256> Buf;
raw_svector_ostream OS(Buf);
for (MacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
MacroArguments Args;
for (MCAsmMacroArguments::iterator i = A.begin(), e = A.end(); i != e; ++i) {
MCAsmMacroArguments Args;
Args.push_back(*i);
if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))
@ -3771,8 +3776,8 @@ bool AsmParser::ParseDirectiveIrp(SMLoc DirectiveLoc) {
/// ParseDirectiveIrpc
/// ::= .irpc symbol,values
bool AsmParser::ParseDirectiveIrpc(SMLoc DirectiveLoc) {
MacroParameters Parameters;
MacroParameter Parameter;
MCAsmMacroParameters Parameters;
MCAsmMacroParameter Parameter;
if (ParseIdentifier(Parameter.first))
return TokError("expected identifier in '.irpc' directive");
@ -3784,7 +3789,7 @@ bool AsmParser::ParseDirectiveIrpc(SMLoc DirectiveLoc) {
Lex();
MacroArguments A;
MCAsmMacroArguments A;
if (ParseMacroArguments(0, A))
return true;
@ -3795,7 +3800,7 @@ bool AsmParser::ParseDirectiveIrpc(SMLoc DirectiveLoc) {
Lex();
// Lex the irpc definition.
Macro *M = ParseMacroLikeBody(DirectiveLoc);
MCAsmMacro *M = ParseMacroLikeBody(DirectiveLoc);
if (!M)
return true;
@ -3810,7 +3815,7 @@ bool AsmParser::ParseDirectiveIrpc(SMLoc DirectiveLoc) {
MCAsmMacroArgument Arg;
Arg.push_back(AsmToken(AsmToken::Identifier, Values.slice(I, I+1)));
MacroArguments Args;
MCAsmMacroArguments Args;
Args.push_back(Arg);
if (expandMacro(OS, M->Body, Parameters, Args, getTok().getLoc()))