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Diffstat (limited to 'src/mesa/shader/slang/MachineIndependent/SymbolTable.h')
| -rwxr-xr-x | src/mesa/shader/slang/MachineIndependent/SymbolTable.h | 320 |
1 files changed, 320 insertions, 0 deletions
diff --git a/src/mesa/shader/slang/MachineIndependent/SymbolTable.h b/src/mesa/shader/slang/MachineIndependent/SymbolTable.h new file mode 100755 index 00000000000..7e4ff682478 --- /dev/null +++ b/src/mesa/shader/slang/MachineIndependent/SymbolTable.h @@ -0,0 +1,320 @@ +//
+//Copyright (C) 2002-2005 3Dlabs Inc. Ltd.
+//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.
+//
+// * 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"
+
+//
+// Symbol base class. (Can build functions or variables out of these...)
+//
+class TSymbol {
+public:
+ POOL_ALLOCATOR_NEW_DELETE(GlobalPoolAllocator)
+ TSymbol(const TString *n) : name(n) { }
+ virtual ~TSymbol() { /* don't delete name, it's from the pool */ }
+ const TString& getName() const { return *name; }
+ virtual const TString& getMangledName() const { return getName(); }
+ virtual bool isFunction() const { return false; }
+ virtual bool isVariable() const { return false; }
+ void setUniqueId(int id) { uniqueId = id; }
+ int getUniqueId() const { return uniqueId; }
+ virtual void dump(TInfoSink &infoSink) const = 0;
+ TSymbol(const TSymbol&);
+ virtual TSymbol* clone(TStructureMap& remapper) = 0;
+
+protected:
+ const TString *name;
+ unsigned int uniqueId; // For real comparing during code generation
+};
+
+//
+// Variable class, meaning a symbol that's not a function.
+//
+// There could be a separate class heirarchy 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), type(t), userType(uT), unionArray(0), arrayInformationType(0) { }
+ virtual ~TVariable() { }
+ virtual bool isVariable() const { return true; }
+ TType& getType() { return type; }
+ const TType& getType() const { return type; }
+ bool isUserType() const { return userType; }
+ void changeQualifier(TQualifier qualifier) { type.changeQualifier(qualifier); }
+ void updateArrayInformationType(TType *t) { arrayInformationType = t; }
+ TType* getArrayInformationType() { return arrayInformationType; }
+
+ virtual void dump(TInfoSink &infoSink) const;
+
+ constUnion* getConstPointer() {
+ if (!unionArray) {
+ if (!type.getStruct())
+ unionArray = new constUnion[type.getInstanceSize()];
+ else
+ unionArray = new constUnion[type.getStructSize()];
+ }
+ return unionArray;
+ }
+
+ constUnion* getConstPointer() const { return unionArray; }
+
+ void shareConstPointer( constUnion *constArray)
+ {
+ delete unionArray;
+ unionArray = constArray;
+ }
+ TVariable(const TVariable&, TStructureMap& remapper); // copy constructor
+ virtual TVariable* clone(TStructureMap& remapper);
+
+protected:
+ TType type;
+ bool userType;
+ // we are assuming that Pool Allocator will free the memory allocated to unionArray
+ // when this object is destroyed
+ constUnion *unionArray;
+ TType *arrayInformationType; // this is used for updating maxArraySize in all the references to a given symbol
+};
+
+//
+// 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, TStructureMap& remapper) {
+ name = NewPoolTString(param.name->c_str());
+ type = param.type->clone(remapper);
+ }
+};
+
+//
+// The function sub-class of a symbol.
+//
+class TFunction : public TSymbol {
+public:
+ TFunction(TOperator o) :
+ TSymbol(0),
+ returnType(TType(EbtVoid)),
+ op(o),
+ defined(false) { }
+ TFunction(const TString *name, TType& retType, TOperator tOp = EOpNull) :
+ TSymbol(name),
+ returnType(retType),
+ mangledName(*name + '('),
+ op(tOp),
+ defined(false) { }
+ virtual ~TFunction();
+ virtual bool isFunction() const { return true; }
+
+ void addParameter(TParameter& p)
+ {
+ parameters.push_back(p);
+ mangledName = mangledName + p.type->getMangledName();
+ }
+
+ const TString& getMangledName() const { return mangledName; }
+ const TType& getReturnType() const { return returnType; }
+ void relateToOperator(TOperator o) { op = o; }
+ TOperator getBuiltInOp() const { return op; }
+ void setDefined() { defined = true; }
+ bool isDefined() { return defined; }
+
+ int getParamCount() const { return static_cast<int>(parameters.size()); }
+ TParameter& operator [](int i) { return parameters[i]; }
+ const TParameter& operator [](int i) const { return parameters[i]; }
+
+ virtual void dump(TInfoSink &infoSink) const;
+ TFunction(const TFunction&, TStructureMap& remapper);
+ virtual TFunction* clone(TStructureMap& remapper);
+
+protected:
+ typedef TVector<TParameter> TParamList;
+ TParamList parameters;
+ TType returnType;
+ TString mangledName;
+ TOperator op;
+ bool defined;
+};
+
+
+class TSymbolTableLevel {
+public:
+ POOL_ALLOCATOR_NEW_DELETE(GlobalPoolAllocator)
+ TSymbolTableLevel() { }
+ ~TSymbolTableLevel();
+
+ bool insert(TSymbol& symbol)
+ {
+ //
+ // returning true means symbol was added to the table
+ //
+ tInsertResult result;
+ result = level.insert(tLevelPair(symbol.getMangledName(), &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 relateToOperator(const char* name, TOperator op);
+ void dump(TInfoSink &infoSink) const;
+ TSymbolTableLevel* clone(TStructureMap& remapper);
+
+protected:
+ 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;
+};
+
+class TSymbolTable {
+public:
+ TSymbolTable() : uniqueId(0)
+ {
+ //
+ // The symbol table cannot be used until push() is called, but
+ // the lack of an initial call to push() can be used to detect
+ // that the symbol table has not been preloaded with built-ins.
+ //
+ }
+
+ TSymbolTable(TSymbolTable& symTable)
+ {
+ table.push_back(symTable.table[0]);
+ uniqueId = symTable.uniqueId;
+ }
+
+ ~TSymbolTable()
+ {
+ // level 0 is always built In symbols, so we never pop that out
+ while (table.size() > 1)
+ pop();
+ }
+
+ //
+ // When the symbol table is initialized with the built-ins, there should
+ // 'push' calls, so that built-ins are at level 0 and the shader
+ // globals are at level 1.
+ //
+ bool isEmpty() { return table.size() == 0; }
+ bool atBuiltInLevel() { return atSharedBuiltInLevel() || atDynamicBuiltInLevel(); }
+ bool atSharedBuiltInLevel() { return table.size() == 1; }
+ bool atGlobalLevel() { return table.size() <= 3; }
+ void push() {
+ table.push_back(new TSymbolTableLevel);
+ }
+
+ void pop() {
+ delete table[currentLevel()];
+ table.pop_back();
+ }
+
+ bool insert(TSymbol& symbol)
+ {
+ symbol.setUniqueId(++uniqueId);
+ return table[currentLevel()]->insert(symbol);
+ }
+
+ TSymbol* find(const TString& name, bool* builtIn = 0, bool *sameScope = 0)
+ {
+ int level = currentLevel();
+ TSymbol* symbol;
+ do {
+ symbol = table[level]->find(name);
+ --level;
+ } while (symbol == 0 && level >= 0);
+ level++;
+ if (builtIn)
+ *builtIn = level == 0;
+ if (sameScope)
+ *sameScope = level == currentLevel();
+ return symbol;
+ }
+
+ TSymbolTableLevel* getGlobalLevel() { assert (table.size() >= 3); return table[2]; }
+ void relateToOperator(const char* name, TOperator op) { table[0]->relateToOperator(name, op); }
+ int getMaxSymbolId() { return uniqueId; }
+ void dump(TInfoSink &infoSink) const;
+ void copyTable(const TSymbolTable& copyOf);
+
+protected:
+ int currentLevel() const { return static_cast<int>(table.size()) - 1; }
+ bool atDynamicBuiltInLevel() { return table.size() == 2; }
+
+ std::vector<TSymbolTableLevel*> table;
+ int uniqueId; // for unique identification in code generation
+};
+
+#endif // _SYMBOL_TABLE_INCLUDED_
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