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+//
+//Copyright (C) 2002-2005 3Dlabs Inc. Ltd.
+//Copyright (C) 2013 LunarG, Inc.
+//
+//All rights reserved.
+//
+//Redistribution and use in source and binary forms, with or without
+//modification, are permitted provided that the following conditions
+//are met:
+//
+// Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//
+// Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+//
+// Neither the name of 3Dlabs Inc. Ltd. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+//THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+//"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+//LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+//FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+//COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+//INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+//BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+//LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+//CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+//LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+//ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+//POSSIBILITY OF SUCH DAMAGE.
+//
+
+#ifndef _SYMBOL_TABLE_INCLUDED_
+#define _SYMBOL_TABLE_INCLUDED_
+
+//
+// Symbol table for parsing. Has these design characteristics:
+//
+// * Same symbol table can be used to compile many shaders, to preserve
+// effort of creating and loading with the large numbers of built-in
+// symbols.
+//
+// --> This requires a copy mechanism, so initial pools used to create
+// the shared information can be popped. Done through "clone"
+// methods.
+//
+// * Name mangling will be used to give each function a unique name
+// so that symbol table lookups are never ambiguous. This allows
+// a simpler symbol table structure.
+//
+// * Pushing and popping of scope, so symbol table will really be a stack
+// of symbol tables. Searched from the top, with new inserts going into
+// the top.
+//
+// * Constants: Compile time constant symbols will keep their values
+// in the symbol table. The parser can substitute constants at parse
+// time, including doing constant folding and constant propagation.
+//
+// * No temporaries: Temporaries made from operations (+, --, .xy, etc.)
+// are tracked in the intermediate representation, not the symbol table.
+//
+
+#include "../Include/Common.h"
+#include "../Include/intermediate.h"
+#include "../Include/InfoSink.h"
+
+namespace glslang {
+
+//
+// Symbol base class. (Can build functions or variables out of these...)
+//
+
+class TVariable;
+class TFunction;
+class TAnonMember;
+
+class TSymbol {
+public:
+ POOL_ALLOCATOR_NEW_DELETE(GetThreadPoolAllocator())
+ explicit TSymbol(const TString *n) : name(n), numExtensions(0), extensions(0), writable(true) { }
+ virtual TSymbol* clone() const = 0;
+ virtual ~TSymbol() { } // rely on all symbol owned memory coming from the pool
+
+ virtual const TString& getName() const { return *name; }
+ virtual void changeName(const TString* newName) { name = newName; }
+ virtual const TString& getMangledName() const { return getName(); }
+ virtual TFunction* getAsFunction() { return 0; }
+ virtual const TFunction* getAsFunction() const { return 0; }
+ virtual TVariable* getAsVariable() { return 0; }
+ virtual const TVariable* getAsVariable() const { return 0; }
+ virtual const TAnonMember* getAsAnonMember() const { return 0; }
+ virtual const TType& getType() const = 0;
+ virtual TType& getWritableType() = 0;
+ virtual void setUniqueId(int id) { uniqueId = id; }
+ virtual int getUniqueId() const { return uniqueId; }
+ virtual void setExtensions(int num, const char* const exts[])
+ {
+ assert(extensions == 0);
+ assert(num > 0);
+ numExtensions = num;
+ extensions = NewPoolObject(exts[0], num);
+ for (int e = 0; e < num; ++e)
+ extensions[e] = exts[e];
+ }
+ virtual int getNumExtensions() const { return numExtensions; }
+ virtual const char** getExtensions() const { return extensions; }
+ virtual void dump(TInfoSink &infoSink) const = 0;
+
+ virtual bool isReadOnly() const { return ! writable; }
+ virtual void makeReadOnly() { writable = false; }
+
+protected:
+ explicit TSymbol(const TSymbol&);
+ TSymbol& operator=(const TSymbol&);
+
+ const TString *name;
+ unsigned int uniqueId; // For cross-scope comparing during code generation
+
+ // For tracking what extensions must be present
+ // (don't use if correct version/profile is present).
+ int numExtensions;
+ const char** extensions; // an array of pointers to existing constant char strings
+
+ //
+ // N.B.: Non-const functions that will be generally used should assert on this,
+ // to avoid overwriting shared symbol-table information.
+ //
+ bool writable;
+};
+
+//
+// Variable class, meaning a symbol that's not a function.
+//
+// There could be a separate class hierarchy for Constant variables;
+// Only one of int, bool, or float, (or none) is correct for
+// any particular use, but it's easy to do this way, and doesn't
+// seem worth having separate classes, and "getConst" can't simply return
+// different values for different types polymorphically, so this is
+// just simple and pragmatic.
+//
+class TVariable : public TSymbol {
+public:
+ TVariable(const TString *name, const TType& t, bool uT = false )
+ : TSymbol(name),
+ userType(uT),
+ constSubtree(nullptr) { type.shallowCopy(t); }
+ virtual TVariable* clone() const;
+ virtual ~TVariable() { }
+
+ virtual TVariable* getAsVariable() { return this; }
+ virtual const TVariable* getAsVariable() const { return this; }
+ virtual const TType& getType() const { return type; }
+ virtual TType& getWritableType() { assert(writable); return type; }
+ virtual bool isUserType() const { return userType; }
+ virtual const TConstUnionArray& getConstArray() const { return constArray; }
+ virtual TConstUnionArray& getWritableConstArray() { assert(writable); return constArray; }
+ virtual void setConstArray(const TConstUnionArray& array) { constArray = array; }
+ virtual void setConstSubtree(TIntermTyped* subtree) { constSubtree = subtree; }
+ virtual TIntermTyped* getConstSubtree() const { return constSubtree; }
+
+ virtual void dump(TInfoSink &infoSink) const;
+
+protected:
+ explicit TVariable(const TVariable&);
+ TVariable& operator=(const TVariable&);
+
+ TType type;
+ bool userType;
+ // we are assuming that Pool Allocator will free the memory allocated to unionArray
+ // when this object is destroyed
+
+ // TODO: these two should be a union
+ // A variable could be a compile-time constant, or a specialization
+ // constant, or neither, but never both.
+ TConstUnionArray constArray; // for compile-time constant value
+ TIntermTyped* constSubtree; // for specialization constant computation
+};
+
+//
+// The function sub-class of symbols and the parser will need to
+// share this definition of a function parameter.
+//
+struct TParameter {
+ TString *name;
+ TType* type;
+ void copyParam(const TParameter& param)
+ {
+ if (param.name)
+ name = NewPoolTString(param.name->c_str());
+ else
+ name = 0;
+ type = param.type->clone();
+ }
+};
+
+//
+// The function sub-class of a symbol.
+//
+class TFunction : public TSymbol {
+public:
+ explicit TFunction(TOperator o) :
+ TSymbol(0),
+ op(o),
+ defined(false), prototyped(false) { }
+ TFunction(const TString *name, const TType& retType, TOperator tOp = EOpNull) :
+ TSymbol(name),
+ mangledName(*name + '('),
+ op(tOp),
+ defined(false), prototyped(false) { returnType.shallowCopy(retType); }
+ virtual TFunction* clone() const;
+ virtual ~TFunction();
+
+ virtual TFunction* getAsFunction() { return this; }
+ virtual const TFunction* getAsFunction() const { return this; }
+
+ virtual void addParameter(TParameter& p)
+ {
+ assert(writable);
+ parameters.push_back(p);
+ p.type->appendMangledName(mangledName);
+ }
+
+ virtual const TString& getMangledName() const { return mangledName; }
+ virtual const TType& getType() const { return returnType; }
+ virtual TType& getWritableType() { return returnType; }
+ virtual void relateToOperator(TOperator o) { assert(writable); op = o; }
+ virtual TOperator getBuiltInOp() const { return op; }
+ virtual void setDefined() { assert(writable); defined = true; }
+ virtual bool isDefined() const { return defined; }
+ virtual void setPrototyped() { assert(writable); prototyped = true; }
+ virtual bool isPrototyped() const { return prototyped; }
+
+ virtual int getParamCount() const { return static_cast<int>(parameters.size()); }
+ virtual TParameter& operator[](int i) { assert(writable); return parameters[i]; }
+ virtual const TParameter& operator[](int i) const { return parameters[i]; }
+
+ virtual void dump(TInfoSink &infoSink) const;
+
+protected:
+ explicit TFunction(const TFunction&);
+ TFunction& operator=(const TFunction&);
+
+ typedef TVector<TParameter> TParamList;
+ TParamList parameters;
+ TType returnType;
+ TString mangledName;
+ TOperator op;
+ bool defined;
+ bool prototyped;
+};
+
+//
+// Members of anonymous blocks are a kind of TSymbol. They are not hidden in
+// the symbol table behind a container; rather they are visible and point to
+// their anonymous container. (The anonymous container is found through the
+// member, not the other way around.)
+//
+class TAnonMember : public TSymbol {
+public:
+ TAnonMember(const TString* n, unsigned int m, const TVariable& a, int an) : TSymbol(n), anonContainer(a), memberNumber(m), anonId(an) { }
+ virtual TAnonMember* clone() const;
+ virtual ~TAnonMember() { }
+
+ virtual const TAnonMember* getAsAnonMember() const { return this; }
+ virtual const TVariable& getAnonContainer() const { return anonContainer; }
+ virtual unsigned int getMemberNumber() const { return memberNumber; }
+
+ virtual const TType& getType() const
+ {
+ const TTypeList& types = *anonContainer.getType().getStruct();
+ return *types[memberNumber].type;
+ }
+
+ virtual TType& getWritableType()
+ {
+ assert(writable);
+ const TTypeList& types = *anonContainer.getType().getStruct();
+ return *types[memberNumber].type;
+ }
+
+ virtual int getAnonId() const { return anonId; }
+ virtual void dump(TInfoSink &infoSink) const;
+
+protected:
+ explicit TAnonMember(const TAnonMember&);
+ TAnonMember& operator=(const TAnonMember&);
+
+ const TVariable& anonContainer;
+ unsigned int memberNumber;
+ int anonId;
+};
+
+class TSymbolTableLevel {
+public:
+ POOL_ALLOCATOR_NEW_DELETE(GetThreadPoolAllocator())
+ TSymbolTableLevel() : defaultPrecision(0), anonId(0) { }
+ ~TSymbolTableLevel();
+
+ bool insert(TSymbol& symbol, bool separateNameSpaces)
+ {
+ //
+ // returning true means symbol was added to the table with no semantic errors
+ //
+ tInsertResult result;
+ const TString& name = symbol.getName();
+ if (name == "") {
+ // An empty name means an anonymous container, exposing its members to the external scope.
+ // Give it a name and insert its members in the symbol table, pointing to the container.
+ char buf[20];
+ snprintf(buf, 20, "%s%d", AnonymousPrefix, anonId);
+ symbol.changeName(NewPoolTString(buf));
+
+ bool isOkay = true;
+ const TTypeList& types = *symbol.getAsVariable()->getType().getStruct();
+ for (unsigned int m = 0; m < types.size(); ++m) {
+ TAnonMember* member = new TAnonMember(&types[m].type->getFieldName(), m, *symbol.getAsVariable(), anonId);
+ result = level.insert(tLevelPair(member->getMangledName(), member));
+ if (! result.second)
+ isOkay = false;
+ }
+
+ ++anonId;
+
+ return isOkay;
+ } else {
+ // Check for redefinition errors:
+ // - STL itself will tell us if there is a direct name collision, with name mangling, at this level
+ // - additionally, check for function-redefining-variable name collisions
+ const TString& insertName = symbol.getMangledName();
+ if (symbol.getAsFunction()) {
+ // make sure there isn't a variable of this name
+ if (! separateNameSpaces && level.find(name) != level.end())
+ return false;
+
+ // insert, and whatever happens is okay
+ level.insert(tLevelPair(insertName, &symbol));
+
+ return true;
+ } else {
+ result = level.insert(tLevelPair(insertName, &symbol));
+
+ return result.second;
+ }
+ }
+ }
+
+ TSymbol* find(const TString& name) const
+ {
+ tLevel::const_iterator it = level.find(name);
+ if (it == level.end())
+ return 0;
+ else
+ return (*it).second;
+ }
+
+ void findFunctionNameList(const TString& name, TVector<TFunction*>& list)
+ {
+ size_t parenAt = name.find_first_of('(');
+ TString base(name, 0, parenAt + 1);
+
+ tLevel::const_iterator begin = level.lower_bound(base);
+ base[parenAt] = ')'; // assume ')' is lexically after '('
+ tLevel::const_iterator end = level.upper_bound(base);
+ for (tLevel::const_iterator it = begin; it != end; ++it)
+ list.push_back(it->second->getAsFunction());
+ }
+
+ // See if there is already a function in the table having the given non-function-style name.
+ bool hasFunctionName(const TString& name) const
+ {
+ tLevel::const_iterator candidate = level.lower_bound(name);
+ if (candidate != level.end()) {
+ const TString& candidateName = (*candidate).first;
+ TString::size_type parenAt = candidateName.find_first_of('(');
+ if (parenAt != candidateName.npos && candidateName.compare(0, parenAt, name) == 0)
+
+ return true;
+ }
+
+ return false;
+ }
+
+ // See if there is a variable at this level having the given non-function-style name.
+ // Return true if name is found, and set variable to true if the name was a variable.
+ bool findFunctionVariableName(const TString& name, bool& variable) const
+ {
+ tLevel::const_iterator candidate = level.lower_bound(name);
+ if (candidate != level.end()) {
+ const TString& candidateName = (*candidate).first;
+ TString::size_type parenAt = candidateName.find_first_of('(');
+ if (parenAt == candidateName.npos) {
+ // not a mangled name
+ if (candidateName == name) {
+ // found a variable name match
+ variable = true;
+ return true;
+ }
+ } else {
+ // a mangled name
+ if (candidateName.compare(0, parenAt, name) == 0) {
+ // found a function name match
+ variable = false;
+ return true;
+ }
+ }
+ }
+
+ return false;
+ }
+
+ // Use this to do a lazy 'push' of precision defaults the first time
+ // a precision statement is seen in a new scope. Leave it at 0 for
+ // when no push was needed. Thus, it is not the current defaults,
+ // it is what to restore the defaults to when popping a level.
+ void setPreviousDefaultPrecisions(const TPrecisionQualifier *p)
+ {
+ // can call multiple times at one scope, will only latch on first call,
+ // as we're tracking the previous scope's values, not the current values
+ if (defaultPrecision != 0)
+ return;
+
+ defaultPrecision = new TPrecisionQualifier[EbtNumTypes];
+ for (int t = 0; t < EbtNumTypes; ++t)
+ defaultPrecision[t] = p[t];
+ }
+
+ void getPreviousDefaultPrecisions(TPrecisionQualifier *p)
+ {
+ // can be called for table level pops that didn't set the
+ // defaults
+ if (defaultPrecision == 0 || p == 0)
+ return;
+
+ for (int t = 0; t < EbtNumTypes; ++t)
+ p[t] = defaultPrecision[t];
+ }
+
+ void relateToOperator(const char* name, TOperator op);
+ void setFunctionExtensions(const char* name, int num, const char* const extensions[]);
+ void dump(TInfoSink &infoSink) const;
+ TSymbolTableLevel* clone() const;
+ void readOnly();
+
+protected:
+ explicit TSymbolTableLevel(TSymbolTableLevel&);
+ TSymbolTableLevel& operator=(TSymbolTableLevel&);
+
+ typedef std::map<TString, TSymbol*, std::less<TString>, pool_allocator<std::pair<const TString, TSymbol*> > > tLevel;
+ typedef const tLevel::value_type tLevelPair;
+ typedef std::pair<tLevel::iterator, bool> tInsertResult;
+
+ tLevel level; // named mappings
+ TPrecisionQualifier *defaultPrecision;
+ int anonId;
+};
+
+class TSymbolTable {
+public:
+ TSymbolTable() : uniqueId(0), noBuiltInRedeclarations(false), separateNameSpaces(false), adoptedLevels(0)
+ {
+ //
+ // This symbol table cannot be used until push() is called.
+ //
+ }
+ ~TSymbolTable()
+ {
+ // this can be called explicitly; safest to code it so it can be called multiple times
+
+ // don't deallocate levels passed in from elsewhere
+ while (table.size() > adoptedLevels)
+ pop(0);
+ }
+
+ void adoptLevels(TSymbolTable& symTable)
+ {
+ for (unsigned int level = 0; level < symTable.table.size(); ++level) {
+ table.push_back(symTable.table[level]);
+ ++adoptedLevels;
+ }
+ uniqueId = symTable.uniqueId;
+ noBuiltInRedeclarations = symTable.noBuiltInRedeclarations;
+ separateNameSpaces = symTable.separateNameSpaces;
+ }
+
+ //
+ // While level adopting is generic, the methods below enact a the following
+ // convention for levels:
+ // 0: common built-ins shared across all stages, all compiles, only one copy for all symbol tables
+ // 1: per-stage built-ins, shared across all compiles, but a different copy per stage
+ // 2: built-ins specific to a compile, like resources that are context-dependent, or redeclared built-ins
+ // 3: user-shader globals
+ //
+protected:
+ static const int globalLevel = 3;
+ bool isSharedLevel(int level) { return level <= 1; } // exclude all per-compile levels
+ bool isBuiltInLevel(int level) { return level <= 2; } // exclude user globals
+ bool isGlobalLevel(int level) { return level <= globalLevel; } // include user globals
+public:
+ bool isEmpty() { return table.size() == 0; }
+ bool atBuiltInLevel() { return isBuiltInLevel(currentLevel()); }
+ bool atGlobalLevel() { return isGlobalLevel(currentLevel()); }
+
+ void setNoBuiltInRedeclarations() { noBuiltInRedeclarations = true; }
+ void setSeparateNameSpaces() { separateNameSpaces = true; }
+
+ void push()
+ {
+ table.push_back(new TSymbolTableLevel);
+ }
+
+ void pop(TPrecisionQualifier *p)
+ {
+ table[currentLevel()]->getPreviousDefaultPrecisions(p);
+ delete table.back();
+ table.pop_back();
+ }
+
+ //
+ // Insert a visible symbol into the symbol table so it can
+ // be found later by name.
+ //
+ // Returns false if the was a name collision.
+ //
+ bool insert(TSymbol& symbol)
+ {
+ symbol.setUniqueId(++uniqueId);
+
+ // make sure there isn't a function of this variable name
+ if (! separateNameSpaces && ! symbol.getAsFunction() && table[currentLevel()]->hasFunctionName(symbol.getName()))
+ return false;
+
+ // check for not overloading or redefining a built-in function
+ if (noBuiltInRedeclarations) {
+ if (atGlobalLevel() && currentLevel() > 0) {
+ if (table[0]->hasFunctionName(symbol.getName()))
+ return false;
+ if (currentLevel() > 1 && table[1]->hasFunctionName(symbol.getName()))
+ return false;
+ }
+ }
+
+ return table[currentLevel()]->insert(symbol, separateNameSpaces);
+ }
+
+ //
+ // To allocate an internal temporary, which will need to be uniquely
+ // identified by the consumer of the AST, but never need to
+ // found by doing a symbol table search by name, hence allowed an
+ // arbitrary name in the symbol with no worry of collision.
+ //
+ void makeInternalVariable(TSymbol& symbol)
+ {
+ symbol.setUniqueId(++uniqueId);
+ }
+
+ //
+ // Copy a variable or anonymous member's structure from a shared level so that
+ // it can be added (soon after return) to the symbol table where it can be
+ // modified without impacting other users of the shared table.
+ //
+ TSymbol* copyUpDeferredInsert(TSymbol* shared)
+ {
+ if (shared->getAsVariable()) {
+ TSymbol* copy = shared->clone();
+ copy->setUniqueId(shared->getUniqueId());
+ return copy;
+ } else {
+ const TAnonMember* anon = shared->getAsAnonMember();
+ assert(anon);
+ TVariable* container = anon->getAnonContainer().clone();
+ container->changeName(NewPoolTString(""));
+ container->setUniqueId(anon->getAnonContainer().getUniqueId());
+ return container;
+ }
+ }
+
+ TSymbol* copyUp(TSymbol* shared)
+ {
+ TSymbol* copy = copyUpDeferredInsert(shared);
+ table[globalLevel]->insert(*copy, separateNameSpaces);
+ if (shared->getAsVariable())
+ return copy;
+ else {
+ // return the copy of the anonymous member
+ return table[globalLevel]->find(shared->getName());
+ }
+ }
+
+ TSymbol* find(const TString& name, bool* builtIn = 0, bool *currentScope = 0)
+ {
+ int level = currentLevel();
+ TSymbol* symbol;
+ do {
+ symbol = table[level]->find(name);
+ --level;
+ } while (symbol == 0 && level >= 0);
+ level++;
+ if (builtIn)
+ *builtIn = isBuiltInLevel(level);
+ if (currentScope)
+ *currentScope = isGlobalLevel(currentLevel()) || level == currentLevel(); // consider shared levels as "current scope" WRT user globals
+
+ return symbol;
+ }
+
+ bool isFunctionNameVariable(const TString& name) const
+ {
+ if (separateNameSpaces)
+ return false;
+
+ int level = currentLevel();
+ do {
+ bool variable;
+ bool found = table[level]->findFunctionVariableName(name, variable);
+ if (found)
+ return variable;
+ --level;
+ } while (level >= 0);
+
+ return false;
+ }
+
+ void findFunctionNameList(const TString& name, TVector<TFunction*>& list, bool& builtIn)
+ {
+ // For user levels, return the set found in the first scope with a match
+ builtIn = false;
+ int level = currentLevel();
+ do {
+ table[level]->findFunctionNameList(name, list);
+ --level;
+ } while (list.empty() && level >= globalLevel);
+
+ if (! list.empty())
+ return;
+
+ // Gather across all built-in levels; they don't hide each other
+ builtIn = true;
+ do {
+ table[level]->findFunctionNameList(name, list);
+ --level;
+ } while (level >= 0);
+ }
+
+ void relateToOperator(const char* name, TOperator op)
+ {
+ for (unsigned int level = 0; level < table.size(); ++level)
+ table[level]->relateToOperator(name, op);
+ }
+
+ void setFunctionExtensions(const char* name, int num, const char* const extensions[])
+ {
+ for (unsigned int level = 0; level < table.size(); ++level)
+ table[level]->setFunctionExtensions(name, num, extensions);
+ }
+
+ void setVariableExtensions(const char* name, int num, const char* const extensions[])
+ {
+ TSymbol* symbol = find(TString(name));
+ if (symbol)
+ symbol->setExtensions(num, extensions);
+ }
+
+ int getMaxSymbolId() { return uniqueId; }
+ void dump(TInfoSink &infoSink) const;
+ void copyTable(const TSymbolTable& copyOf);
+
+ void setPreviousDefaultPrecisions(TPrecisionQualifier *p) { table[currentLevel()]->setPreviousDefaultPrecisions(p); }
+
+ void readOnly()
+ {
+ for (unsigned int level = 0; level < table.size(); ++level)
+ table[level]->readOnly();
+ }
+
+protected:
+ TSymbolTable(TSymbolTable&);
+ TSymbolTable& operator=(TSymbolTableLevel&);
+
+ int currentLevel() const { return static_cast<int>(table.size()) - 1; }
+
+ std::vector<TSymbolTableLevel*> table;
+ int uniqueId; // for unique identification in code generation
+ bool noBuiltInRedeclarations;
+ bool separateNameSpaces;
+ unsigned int adoptedLevels;
+};
+
+} // end namespace glslang
+
+#endif // _SYMBOL_TABLE_INCLUDED_
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