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87 lines
2.7 KiB
C++
87 lines
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: set ts=8 sts=4 et sw=4 tw=99:
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef jit_StupidAllocator_h
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#define jit_StupidAllocator_h
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#include "jit/RegisterAllocator.h"
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// Simple register allocator that only carries registers within basic blocks.
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namespace js {
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namespace jit {
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class StupidAllocator : public RegisterAllocator
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{
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static const uint32_t MAX_REGISTERS = Registers::Allocatable + FloatRegisters::Allocatable;
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static const uint32_t MISSING_ALLOCATION = UINT32_MAX;
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struct AllocatedRegister {
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AnyRegister reg;
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// Virtual register this physical reg backs, or MISSING_ALLOCATION.
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uint32_t vreg;
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// id of the instruction which most recently used this register.
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uint32_t age;
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// Whether the physical register is not synced with the backing stack slot.
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bool dirty;
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void set(uint32_t vreg, LInstruction *ins = nullptr, bool dirty = false) {
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this->vreg = vreg;
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this->age = ins ? ins->id() : 0;
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this->dirty = dirty;
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}
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};
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// Active allocation for the current code position.
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AllocatedRegister registers[MAX_REGISTERS];
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uint32_t registerCount;
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// Type indicating an index into registers.
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typedef uint32_t RegisterIndex;
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// Information about each virtual register.
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Vector<LDefinition*, 0, SystemAllocPolicy> virtualRegisters;
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public:
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StupidAllocator(MIRGenerator *mir, LIRGenerator *lir, LIRGraph &graph)
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: RegisterAllocator(mir, lir, graph)
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{
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}
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bool go();
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private:
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bool init();
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void syncForBlockEnd(LBlock *block, LInstruction *ins);
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void allocateForInstruction(LInstruction *ins);
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void allocateForDefinition(LInstruction *ins, LDefinition *def);
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LAllocation *stackLocation(uint32_t vreg);
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RegisterIndex registerIndex(AnyRegister reg);
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AnyRegister ensureHasRegister(LInstruction *ins, uint32_t vreg);
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RegisterIndex allocateRegister(LInstruction *ins, uint32_t vreg);
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void syncRegister(LInstruction *ins, RegisterIndex index);
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void evictRegister(LInstruction *ins, RegisterIndex index);
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void loadRegister(LInstruction *ins, uint32_t vreg, RegisterIndex index);
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RegisterIndex findExistingRegister(uint32_t vreg);
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bool allocationRequiresRegister(const LAllocation *alloc, AnyRegister reg);
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bool registerIsReserved(LInstruction *ins, AnyRegister reg);
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};
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} // namespace jit
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} // namespace js
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#endif /* jit_StupidAllocator_h */
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