gglassembler.h

Android 一些工具

/* libs/pixelflinger/codeflinger/GGLAssembler.h
**
** Copyright 2006, The Android Open Source Project
**
** Licensed under the Apache License, Version 2.0 (the "License"); 
** you may not use this file except in compliance with the License. 
** You may obtain a copy of the License at 
**
**     http://www.apache.org/licenses/LICENSE-2.0 
**
** Unless required by applicable law or agreed to in writing, software 
** distributed under the License is distributed on an "AS IS" BASIS, 
** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 
** See the License for the specific language governing permissions and 
** limitations under the License.
*/


#ifndef ANDROID_GGLASSEMBLER_H
#define ANDROID_GGLASSEMBLER_H

#include <stdint.h>
#include <sys/types.h>

#include <private/pixelflinger/ggl_context.h>

#include "codeflinger/ARMAssemblerProxy.h"


namespace android {

// ----------------------------------------------------------------------------

#define CONTEXT_LOAD(REG, FIELD) \
    LDR(AL, REG, mBuilderContext.Rctx, immed12_pre(GGL_OFFSETOF(FIELD)))

#define CONTEXT_STORE(REG, FIELD) \
    STR(AL, REG, mBuilderContext.Rctx, immed12_pre(GGL_OFFSETOF(FIELD)))


class RegisterAllocator
{
public:
    class RegisterFile;
    
    RegisterFile&   registerFile();
    int             reserveReg(int reg);
    int             obtainReg();
    void            recycleReg(int reg);
    void            reset();

    class RegisterFile
    {
    public:
                            RegisterFile();
                            RegisterFile(const RegisterFile& rhs);
                            ~RegisterFile();

                void        reset();

                bool operator == (const RegisterFile& rhs) const;
                bool operator != (const RegisterFile& rhs) const {
                    return !operator == (rhs);
                }

                int         reserve(int reg);
                void        reserveSeveral(uint32_t regMask);

                void        recycle(int reg);
                void        recycleSeveral(uint32_t regMask);

                int         obtain();
        inline  int         isUsed(int reg) const;

                bool        hasFreeRegs() const;
                int         countFreeRegs() const;                

                uint32_t    touched() const;
        inline  uint32_t    status() const { return mStatus; }
        
        enum {
            OUT_OF_REGISTERS = 0x1
        };

    private:
        uint32_t    mRegs;
        uint32_t    mTouched;
        uint32_t    mStatus;
    };
 
    class Scratch
    {
    public:
            Scratch(RegisterFile& regFile)
                : mRegFile(regFile), mScratch(0) { 
            }
            ~Scratch() {
                mRegFile.recycleSeveral(mScratch);
            }
        int obtain() { 
            int reg = mRegFile.obtain();
            mScratch |= 1<<reg;
            return reg;
        }
        void recycle(int reg) {
            mRegFile.recycle(reg);
            mScratch &= ~(1<<reg);
        }
        bool isUsed(int reg) {
            return (mScratch & (1<<reg));
        }
        int countFreeRegs() {
            return mRegFile.countFreeRegs();
        }
    private:
        RegisterFile&   mRegFile;
        uint32_t        mScratch;
    };

    class Spill
    {
    public:
        Spill(RegisterFile& regFile, ARMAssemblerInterface& gen, uint32_t reglist)
            : mRegFile(regFile), mGen(gen), mRegList(reglist), mCount(0)
        {
            if (reglist) {
                int count = 0;
                while (reglist) {
                    count++;
                    reglist &= ~(1 << (31 - __builtin_clz(reglist)));
                }
                if (count == 1) {
                    int reg = 31 - __builtin_clz(mRegList);
                    mGen.STR(mGen.AL, reg, mGen.SP, mGen.immed12_pre(-4, 1));
                } else {
                    mGen.STM(mGen.AL, mGen.DB, mGen.SP, 1, mRegList);
                }
                mRegFile.recycleSeveral(mRegList);
                mCount = count;
            }
        }
        ~Spill() {
            if (mRegList) {
                if (mCount == 1) {
                    int reg = 31 - __builtin_clz(mRegList);
                    mGen.LDR(mGen.AL, reg, mGen.SP, mGen.immed12_post(4));
                } else {
                    mGen.LDM(mGen.AL, mGen.IA, mGen.SP, 1, mRegList);
                }
                mRegFile.reserveSeveral(mRegList);
            }
        }
    private:
        RegisterFile&           mRegFile;
        ARMAssemblerInterface&  mGen;
        uint32_t                mRegList;
        int                     mCount;
    };
    
private:
    RegisterFile    mRegs;
};

// ----------------------------------------------------------------------------

class GGLAssembler : public ARMAssemblerProxy, public RegisterAllocator
{
public:

                    GGLAssembler(ARMAssemblerInterface* target);
        virtual     ~GGLAssembler();

    uint32_t*   base() const { return 0; } // XXX
    uint32_t*   pc() const { return 0; } // XXX

    void        reset(int opt_level);

    virtual void    prolog();
    virtual void    epilog(uint32_t touched);

        // generate scanline code for given needs
    int         scanline(const needs_t& needs, context_t const* c);
    int         scanline_core(const needs_t& needs, context_t const* c);

        enum {
            CLEAR_LO    = 0x0001,
            CLEAR_HI    = 0x0002,
            CORRUPTIBLE = 0x0004,
            FIRST       = 0x0008
        };

        enum { //load/store flags
            WRITE_BACK  = 0x0001
        };

        struct reg_t {
            reg_t() : reg(-1), flags(0) {
            }
            reg_t(int r, int f=0)
                : reg(r), flags(f) {
            }
            void setTo(int r, int f=0) {
                reg=r; flags=f;
            }
            int         reg;
            uint16_t    flags;
        };

        struct integer_t : public reg_t {
            integer_t() : reg_t(), s(0) {
            }
            integer_t(int r, int sz=32, int f=0)
                : reg_t(r, f), s(sz) {
            }
            void setTo(int r, int sz=32, int f=0) {
                reg_t::setTo(r, f); s=sz;
            }
            int8_t s;
            inline int size() const { return s; }
        };
        
        struct pixel_t : public reg_t {
            pixel_t() : reg_t() {
                memset(&format, 0, sizeof(GGLFormat));
            }
            pixel_t(int r, const GGLFormat* fmt, int f=0)
                : reg_t(r, f), format(*fmt) {
            }
            void setTo(int r, const GGLFormat* fmt, int f=0) {
                reg_t::setTo(r, f); format = *fmt;
            }
            GGLFormat format;
            inline int hi(int c) const { return format.c[c].h; }
            inline int low(int c) const { return format.c[c].l; }
            inline int mask(int c) const { return ((1<<size(c))-1) << low(c); }
            inline int size() const { return format.size*8; }
            inline int size(int c) const { return component_size(c); }
            inline int component_size(int c) const { return hi(c) - low(c); }
        };

        struct component_t : public reg_t {
            component_t() : reg_t(), h(0), l(0) {
            }
            component_t(int r, int f=0)
                : reg_t(r, f), h(0), l(0) {
            }
            component_t(int r, int lo, int hi, int f=0)
                : reg_t(r, f), h(hi), l(lo) {
            }
            explicit component_t(const integer_t& rhs)
                : reg_t(rhs.reg, rhs.flags), h(rhs.s), l(0) {
            }
            explicit component_t(const pixel_t& rhs, int component) {
                setTo(  rhs.reg, 
                        rhs.format.c[component].l,
                        rhs.format.c[component].h,
                        rhs.flags|CLEAR_LO|CLEAR_HI);
            }
            void setTo(int r, int lo=0, int hi=0, int f=0) {
                reg_t::setTo(r, f); h=hi; l=lo;
            }
            int8_t h;
            int8_t l;
            inline int size() const { return h-l; }
        };

        struct pointer_t : public reg_t {
            pointer_t() : reg_t(), size(0) {
            }
            pointer_t(int r, int s, int f=0)
                : reg_t(r, f), size(s) {
            }
            void setTo(int r, int s, int f=0) {
                reg_t::setTo(r, f); size=s;
            }