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https://github.com/ZDoom/qzdoom-gpl.git
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6e88529324
- Changed Actor's Damage property into an actual function. All access to the damage property must now be done through GetMissileDamage. actor->GetMissileDamage(0, 1) is equivalent to the former actor->Damage, for the case where actor->Damage was not an expression. (I suppose I will probably need to make a thunk for DECORATE expressions that want to read it.) - Cleaned up some decorate expression evaluation functions that are no longer used. SVN r3919 (scripting)
80 lines
2 KiB
C++
80 lines
2 KiB
C++
#ifndef VMUTIL_H
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#define VMUTIL_H
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#include "vm.h"
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class VMFunctionBuilder
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{
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public:
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// Keeps track of which registers are available by way of a bitmask table.
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class RegAvailability
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{
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public:
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RegAvailability();
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int Get(int count); // Returns the first register in the range
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void Return(int reg, int count);
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private:
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VM_UWORD Used[256/32]; // Bitmap of used registers (bit set means reg is used)
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int MostUsed;
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friend class VMFunctionBuilder;
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};
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VMFunctionBuilder();
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~VMFunctionBuilder();
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VMScriptFunction *MakeFunction();
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// Returns the constant register holding the value.
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int GetConstantInt(int val);
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int GetConstantFloat(double val);
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int GetConstantAddress(void *ptr, VM_ATAG tag);
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int GetConstantString(FString str);
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// Returns the address of the newly-emitted instruction.
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size_t Emit(int opcode, int opa, int opb, int opc);
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size_t Emit(int opcode, int opa, VM_SHALF opbc);
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size_t Emit(int opcode, int opabc);
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size_t EmitLoadInt(int regnum, int value);
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size_t EmitRetInt(int retnum, bool final, int value);
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void Backpatch(size_t addr, size_t target);
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void BackpatchToHere(size_t addr);
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// Write out complete constant tables.
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void FillIntConstants(int *konst);
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void FillFloatConstants(double *konst);
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void FillAddressConstants(FVoidObj *konst, VM_ATAG *tags);
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void FillStringConstants(FString *strings);
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// Track available registers.
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RegAvailability Registers[4];
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private:
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struct AddrKonst
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{
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int KonstNum;
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VM_ATAG Tag;
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};
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// These map from the constant value to its position in the constant table.
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TMap<int, int> IntConstants;
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TMap<double, int> FloatConstants;
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TMap<void *, AddrKonst> AddressConstants;
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TMap<FString, int> StringConstants;
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int NumIntConstants;
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int NumFloatConstants;
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int NumAddressConstants;
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int NumStringConstants;
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int MaxParam;
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int ActiveParam;
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TArray<VMOP> Code;
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// PARAM increases ActiveParam; CALL decreases it.
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void ParamChange(int delta);
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};
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#endif
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