1 //===-- llvm/SlotCalculator.h - Calculate value slots -----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This class calculates the slots that values will land in. This is useful for
11 // when writing bytecode or assembly out, because you have to know these things.
13 // Specifically, this class calculates the "type plane numbering" that you see
14 // for a function if you strip out all of the symbols in it. For assembly
15 // writing, this is used when a symbol does not have a name. For bytecode
16 // writing, this is always used, and the symbol table is added on later.
18 //===----------------------------------------------------------------------===//
20 #ifndef LLVM_SLOTCALCULATOR_H
21 #define LLVM_SLOTCALCULATOR_H
34 class SlotCalculator {
35 const Module *TheModule;
37 /// BuildBytecodeInfo - If true, this is the creating information for the
38 /// bytecode writer, if false, we are building information for the assembly
39 /// emitter. The assembly emitter doesn't need named objects numbered, among
40 /// other differences.
41 bool BuildBytecodeInfo;
43 typedef std::vector<const Value*> TypePlane;
44 std::vector<TypePlane> Table;
45 std::map<const Value*, unsigned> NodeMap;
47 /// ConstantStrings - If we are indexing for a bytecode file, this keeps track
48 /// of all of the constants strings that need to be emitted.
49 std::vector<const ConstantArray*> ConstantStrings;
51 /// ModuleLevel - Used to keep track of which values belong to the module,
52 /// and which values belong to the currently incorporated function.
54 std::vector<unsigned> ModuleLevel;
57 SlotCalculator(const Module *M, bool BuildBytecodeInfo);
58 // Start out in incorp state
59 SlotCalculator(const Function *F, bool BuildBytecodeInfo);
61 /// getSlot returns < 0 on error!
63 int getSlot(const Value *D) const;
65 inline unsigned getNumPlanes() const { return Table.size(); }
66 inline unsigned getModuleLevel(unsigned Plane) const {
67 return Plane < ModuleLevel.size() ? ModuleLevel[Plane] : 0;
70 inline const TypePlane &getPlane(unsigned Plane) const {
74 /// incorporateFunction/purgeFunction - If you'd like to deal with a function,
75 /// use these two methods to get its data into the SlotCalculator!
77 void incorporateFunction(const Function *F);
80 /// string_iterator/string_begin/end - Access the list of module-level
81 /// constant strings that have been incorporated. This is only applicable to
83 typedef std::vector<const ConstantArray*>::const_iterator string_iterator;
84 string_iterator string_begin() const { return ConstantStrings.begin(); }
85 string_iterator string_end() const { return ConstantStrings.end(); }
89 // getOrCreateSlot - Values can be crammed into here at will... if
90 // they haven't been inserted already, they get inserted, otherwise
93 int getOrCreateSlot(const Value *D);
95 // insertValue - Insert a value into the value table... Return the
96 // slot that it occupies, or -1 if the declaration is to be ignored
97 // because of the IgnoreNamedNodes flag.
99 int insertValue(const Value *D, bool dontIgnore = false);
101 // doInsertValue - Small helper function to be called only be insertVal.
102 int doInsertValue(const Value *D);
104 // processModule - Process all of the module level function declarations and
105 // types that are available.
107 void processModule();
109 // processSymbolTable - Insert all of the values in the specified symbol table
110 // into the values table...
112 void processSymbolTable(const SymbolTable *ST);
113 void processSymbolTableConstants(const SymbolTable *ST);
116 } // End llvm namespace