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add a new DirectiveMap stringmap, which allows more efficient dispatching

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to directive handlers and allows for easier extensibility.

I only switched a few over for now.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82926 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-09-27 21:16:52 +00:00
parent e4172f48cc
commit ebb89b4186
2 changed files with 35 additions and 23 deletions
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30
tools/llvm-mc/AsmParser.cpp
View File

@ -32,6 +32,18 @@ using namespace llvm;
// TargetLoweringObjectFile.
typedef StringMap<const MCSectionMachO*> MachOUniqueMapTy;
AsmParser::AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
const MCAsmInfo &_MAI)
: Lexer(_SM, _MAI), Ctx(_Ctx), Out(_Out), TargetParser(0),
SectionUniquingMap(0) {
// Debugging directives.
AddDirectiveHandler(".file", &AsmParser::ParseDirectiveFile);
AddDirectiveHandler(".line", &AsmParser::ParseDirectiveLine);
AddDirectiveHandler(".loc", &AsmParser::ParseDirectiveLoc);
}
AsmParser::~AsmParser() {
// If we have the MachO uniquing map, free it.
delete (MachOUniqueMapTy*)SectionUniquingMap;
@ -672,14 +684,10 @@ bool AsmParser::ParseStatement() {
if (IDVal == ".load")
return ParseDirectiveDarwinDumpOrLoad(IDLoc, /*IsLoad=*/false);
// Debugging directives
if (IDVal == ".file")
return ParseDirectiveFile(IDLoc);
if (IDVal == ".line")
return ParseDirectiveLine(IDLoc);
if (IDVal == ".loc")
return ParseDirectiveLoc(IDLoc);
// Look up the handler in the handler table,
bool(AsmParser::*Handler)(StringRef, SMLoc) = DirectiveMap[IDVal];
if (Handler)
return (this->*Handler)(IDVal, IDLoc);
// Target hook for parsing target specific directives.
if (!getTargetParser().ParseDirective(ID))
@ -1587,7 +1595,7 @@ bool AsmParser::ParseDirectiveEndIf(SMLoc DirectiveLoc) {
/// ParseDirectiveFile
/// ::= .file [number] string
bool AsmParser::ParseDirectiveFile(SMLoc DirectiveLoc) {
bool AsmParser::ParseDirectiveFile(StringRef, SMLoc DirectiveLoc) {
// FIXME: I'm not sure what this is.
int64_t FileNumber = -1;
if (Lexer.is(AsmToken::Integer)) {
@ -1614,7 +1622,7 @@ bool AsmParser::ParseDirectiveFile(SMLoc DirectiveLoc) {
/// ParseDirectiveLine
/// ::= .line [number]
bool AsmParser::ParseDirectiveLine(SMLoc DirectiveLoc) {
bool AsmParser::ParseDirectiveLine(StringRef, SMLoc DirectiveLoc) {
if (Lexer.isNot(AsmToken::EndOfStatement)) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.line' directive");
@ -1635,7 +1643,7 @@ bool AsmParser::ParseDirectiveLine(SMLoc DirectiveLoc) {
/// ParseDirectiveLoc
/// ::= .loc number [number [number]]
bool AsmParser::ParseDirectiveLoc(SMLoc DirectiveLoc) {
bool AsmParser::ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc) {
if (Lexer.isNot(AsmToken::Integer))
return TokError("unexpected token in '.loc' directive");

26
tools/llvm-mc/AsmParser.h
View File

@ -21,6 +21,7 @@
#include "llvm/MC/MCSectionMachO.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/ADT/StringMap.h"
namespace llvm {
class AsmCond;
@ -47,15 +48,23 @@ private:
// is also used by TargetLoweringObjectFile.
mutable void *SectionUniquingMap;
/// DirectiveMap - This is a table handlers for directives. Each handler is
/// invoked after the directive identifier is read and is responsible for
/// parsing and validating the rest of the directive. The handler is passed
/// in the directive name and the location of the directive keyword.
StringMap<bool(AsmParser::*)(StringRef, SMLoc)> DirectiveMap;
public:
AsmParser(SourceMgr &_SM, MCContext &_Ctx, MCStreamer &_Out,
const MCAsmInfo &_MAI)
: Lexer(_SM, _MAI), Ctx(_Ctx), Out(_Out), TargetParser(0),
SectionUniquingMap(0) {}
const MCAsmInfo &_MAI);
~AsmParser();
bool Run();
void AddDirectiveHandler(StringRef Directive,
bool (AsmParser::*Handler)(StringRef, SMLoc)) {
DirectiveMap[Directive] = Handler;
}
public:
TargetAsmParser &getTargetParser() const { return *TargetParser; }
void setTargetParser(TargetAsmParser &P) { TargetParser = &P; }
@ -64,19 +73,14 @@ public:
/// {
virtual MCAsmLexer &getLexer() { return Lexer; }
virtual MCContext &getContext() { return Ctx; }
virtual MCStreamer &getStreamer() { return Out; }
virtual void Warning(SMLoc L, const Twine &Meg);
virtual bool Error(SMLoc L, const Twine &Msg);
virtual bool ParseExpression(const MCExpr *&Res);
virtual bool ParseParenExpression(const MCExpr *&Res);
virtual bool ParseAbsoluteExpression(int64_t &Res);
/// }
@ -145,9 +149,9 @@ private:
bool ParseDirectiveElse(SMLoc DirectiveLoc); // ".else"
bool ParseDirectiveEndIf(SMLoc DirectiveLoc); // .endif
bool ParseDirectiveFile(SMLoc DirectiveLoc); // ".file"
bool ParseDirectiveLine(SMLoc DirectiveLoc); // ".line"
bool ParseDirectiveLoc(SMLoc DirectiveLoc); // ".loc"
bool ParseDirectiveFile(StringRef, SMLoc DirectiveLoc); // ".file"
bool ParseDirectiveLine(StringRef, SMLoc DirectiveLoc); // ".line"
bool ParseDirectiveLoc(StringRef, SMLoc DirectiveLoc); // ".loc"
/// ParseEscapedString - Parse the current token as a string which may include
/// escaped characters and return the string contents.