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https://github.com/ZDoom/qzdoom.git
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b1a83bfd26
* everything related to scripting is now placed in a subdirectory 'scripting', which itself is separated into DECORATE, ZSCRIPT, the VM and code generation. * a few items have been moved to different headers so that the DECORATE parser definitions can mostly be kept local. The only exception at the moment is the flags interface on which 3 source files depend.
90 lines
2.2 KiB
C++
90 lines
2.2 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 GetMostUsed() { return MostUsed; }
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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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bool Reuse(int regnum);
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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(bool checkself = false);
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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 next instruction to be emitted.
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size_t GetAddress();
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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 EmitParamInt(int value);
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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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// PARAM increases ActiveParam; CALL decreases it.
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void ParamChange(int delta);
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// Track available registers.
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RegAvailability Registers[4];
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// For use by DECORATE's self/stateowner sanitizer.
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bool IsActionFunc;
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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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};
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#endif
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