Front-ends: Remove now defunct afterEOF and related, use scanner's instead.

Code using atEndOfFile was dead, instead do something useful with
the scanners atEndOfInput().  This allows a better error message
for early termination of cascading errors.

glslang/MachineIndependent/ParseHelper.cpp

@@ -55,7 +55,6 @@ TParseContext::TParseContext(TSymbolTable& symbolTable, TIntermediate& interm, b
             contextPragma(true, false), loopNestingLevel(0), structNestingLevel(0), controlFlowNestingLevel(0), statementNestingLevel(0),
             inMain(false), postMainReturn(false), currentFunctionType(nullptr), blockName(nullptr),
             limits(resources.limits), parsingBuiltins(parsingBuiltins),
-            afterEOF(false),
             atomicUintOffsets(nullptr), anyIndexLimits(false)
 {
     // ensure we always have a linkage node, even if empty, to simplify tree topology algorithms
@@ -193,13 +192,15 @@ bool TParseContext::parseShaderStrings(TPpContext& ppContext, TInputScanner& inp
 }
 
 // This is called from bison when it has a parse (syntax) error
+// Note though that to stop cascading errors, we set EOF, which
+// will usually cause a syntax error, so be more accurate that
+// compilation is terminating.
 void TParseContext::parserError(const char* s)
 {
-    if (afterEOF) {
-        if (tokensBeforeEOF == 1)
-            error(getCurrentLoc(), "", "premature end of input", s, "");
-    } else
+    if (! getScanner()->atEndOfInput() || numErrors == 0)
         error(getCurrentLoc(), "", "", s, "");
+    else
+        error(getCurrentLoc(), "compilation terminated", "", "");
 }
 
 void TParseContext::handlePragma(const TSourceLoc& loc, const TVector<TString>& tokens)

glslang/MachineIndependent/ParseHelper.h

@@ -77,7 +77,7 @@ public:
                       EProfile profile, const SpvVersion& spvVersion, EShLanguage language,
                       TInfoSink& infoSink, bool forwardCompatible, EShMessages messages)
           : TParseVersions(interm, version, profile, spvVersion, language, infoSink, forwardCompatible, messages),
-            symbolTable(symbolTable), tokensBeforeEOF(false),
+            symbolTable(symbolTable),
             linkage(nullptr), scanContext(nullptr), ppContext(nullptr) { }
     virtual ~TParseContextBase() { }
 
@@ -125,7 +125,6 @@ public:
     }
 
     TSymbolTable& symbolTable;   // symbol table that goes with the current language, version, and profile
-    bool tokensBeforeEOF;
 
 protected:
     TParseContextBase(TParseContextBase&);
@@ -387,7 +386,6 @@ protected:
     static const int maxSamplerIndex = EsdNumDims * (EbtNumTypes * (2 * 2 * 2 * 2 * 2)); // see computeSamplerTypeIndex()
     TPrecisionQualifier defaultSamplerPrecision[maxSamplerIndex];
     TPrecisionManager precisionManager;
-    bool afterEOF;
     TQualifier globalBufferDefaults;
     TQualifier globalUniformDefaults;
     TQualifier globalInputDefaults;

glslang/MachineIndependent/Scan.h

@@ -204,6 +204,8 @@ public:
         currentSource = numSources;
     }
 
+    bool atEndOfInput() const { return endOfFileReached; }
+
     const TSourceLoc& getSourceLoc() const
     {
         if (singleLogical) {

glslang/MachineIndependent/preprocessor/PpScanner.cpp

@@ -762,12 +762,8 @@ const char* TPpContext::tokenize(TPpToken* ppToken)
             break;
         }
 
-        if (tokenString) {
-            if (tokenString[0] != 0)
-                parseContext.tokensBeforeEOF = 1;
-
+        if (tokenString)
             return tokenString;
-        }
     }
 }