1/* 2 * Copyright (C) 2009 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17/* 18 * This file contains target independent register alloction support. 19 */ 20 21#include "compiler/CompilerUtility.h" 22#include "compiler/CompilerIR.h" 23#include "compiler/Dataflow.h" 24#include "compiler/codegen/arm/ArmLIR.h" 25 26/* 27 * Return most flexible allowed register class based on size. 28 * Bug: 2813841 29 * Must use a core register for data types narrower than word (due 30 * to possible unaligned load/store. 31 */ 32static inline RegisterClass dvmCompilerRegClassBySize(OpSize size) 33{ 34 return (size == kUnsignedHalf || 35 size == kSignedHalf || 36 size == kUnsignedByte || 37 size == kSignedByte ) ? kCoreReg : kAnyReg; 38} 39 40static inline int dvmCompilerS2VReg(CompilationUnit *cUnit, int sReg) 41{ 42 assert(sReg != INVALID_SREG); 43 return DECODE_REG(dvmConvertSSARegToDalvik(cUnit, sReg)); 44} 45 46/* Reset the tracker to unknown state */ 47static inline void dvmCompilerResetNullCheck(CompilationUnit *cUnit) 48{ 49 dvmClearAllBits(cUnit->regPool->nullCheckedRegs); 50} 51 52/* 53 * Get the "real" sreg number associated with an sReg slot. In general, 54 * sReg values passed through codegen are the SSA names created by 55 * dataflow analysis and refer to slot numbers in the cUnit->regLocation 56 * array. However, renaming is accomplished by simply replacing RegLocation 57 * entries in the cUnit->reglocation[] array. Therefore, when location 58 * records for operands are first created, we need to ask the locRecord 59 * identified by the dataflow pass what it's new name is. 60 */ 61 62static inline int dvmCompilerSRegHi(int lowSreg) { 63 return (lowSreg == INVALID_SREG) ? INVALID_SREG : lowSreg + 1; 64} 65 66 67static inline bool dvmCompilerLiveOut(CompilationUnit *cUnit, int sReg) 68{ 69 //TODO: fully implement 70 return true; 71} 72 73static inline int dvmCompilerSSASrc(MIR *mir, int num) 74{ 75 assert(mir->ssaRep->numUses > num); 76 return mir->ssaRep->uses[num]; 77} 78 79extern RegLocation dvmCompilerEvalLoc(CompilationUnit *cUnit, RegLocation loc, 80 int regClass, bool update); 81/* Mark a temp register as dead. Does not affect allocation state. */ 82extern void dvmCompilerClobber(CompilationUnit *cUnit, int reg); 83 84extern RegLocation dvmCompilerUpdateLoc(CompilationUnit *cUnit, 85 RegLocation loc); 86 87/* see comments for updateLoc */ 88extern RegLocation dvmCompilerUpdateLocWide(CompilationUnit *cUnit, 89 RegLocation loc); 90 91/* Clobber all of the temps that might be used by a handler. */ 92extern void dvmCompilerClobberHandlerRegs(CompilationUnit *cUnit); 93 94extern void dvmCompilerMarkLive(CompilationUnit *cUnit, int reg, int sReg); 95 96extern void dvmCompilerMarkDirty(CompilationUnit *cUnit, int reg); 97 98extern void dvmCompilerMarkPair(CompilationUnit *cUnit, int lowReg, 99 int highReg); 100 101extern void dvmCompilerMarkClean(CompilationUnit *cUnit, int reg); 102 103extern void dvmCompilerResetDef(CompilationUnit *cUnit, int reg); 104 105extern void dvmCompilerResetDefLoc(CompilationUnit *cUnit, RegLocation rl); 106 107/* Set up temp & preserved register pools specialized by target */ 108extern void dvmCompilerInitPool(RegisterInfo *regs, int *regNums, int num); 109 110/* 111 * Mark the beginning and end LIR of a def sequence. Note that 112 * on entry start points to the LIR prior to the beginning of the 113 * sequence. 114 */ 115extern void dvmCompilerMarkDef(CompilationUnit *cUnit, RegLocation rl, 116 LIR *start, LIR *finish); 117/* 118 * Mark the beginning and end LIR of a def sequence. Note that 119 * on entry start points to the LIR prior to the beginning of the 120 * sequence. 121 */ 122extern void dvmCompilerMarkDefWide(CompilationUnit *cUnit, RegLocation rl, 123 LIR *start, LIR *finish); 124 125extern RegLocation dvmCompilerGetSrcWide(CompilationUnit *cUnit, MIR *mir, 126 int low, int high); 127 128extern RegLocation dvmCompilerGetDestWide(CompilationUnit *cUnit, MIR *mir, 129 int low, int high); 130// Get the LocRecord associated with an SSA name use. 131extern RegLocation dvmCompilerGetSrc(CompilationUnit *cUnit, MIR *mir, int num); 132 133// Get the LocRecord associated with an SSA name def. 134extern RegLocation dvmCompilerGetDest(CompilationUnit *cUnit, MIR *mir, 135 int num); 136 137extern RegLocation dvmCompilerGetReturnWide(CompilationUnit *cUnit); 138 139/* Clobber all regs that might be used by an external C call */ 140extern void dvmCompilerClobberCallRegs(CompilationUnit *cUnit); 141 142extern RegisterInfo *dvmCompilerIsTemp(CompilationUnit *cUnit, int reg); 143 144extern void dvmCompilerMarkInUse(CompilationUnit *cUnit, int reg); 145 146extern int dvmCompilerAllocTemp(CompilationUnit *cUnit); 147 148extern int dvmCompilerAllocTempFloat(CompilationUnit *cUnit); 149 150//REDO: too many assumptions. 151extern int dvmCompilerAllocTempDouble(CompilationUnit *cUnit); 152 153extern void dvmCompilerFreeTemp(CompilationUnit *cUnit, int reg); 154 155extern void dvmCompilerResetDefLocWide(CompilationUnit *cUnit, RegLocation rl); 156 157extern void dvmCompilerResetDefTracking(CompilationUnit *cUnit); 158 159/* Kill the corresponding bit in the null-checked register list */ 160extern void dvmCompilerKillNullCheckedLoc(CompilationUnit *cUnit, 161 RegLocation loc); 162 163//FIXME - this needs to also check the preserved pool. 164extern RegisterInfo *dvmCompilerIsLive(CompilationUnit *cUnit, int reg); 165 166/* To be used when explicitly managing register use */ 167extern void dvmCompilerLockAllTemps(CompilationUnit *cUnit); 168 169extern void dvmCompilerFlushAllRegs(CompilationUnit *cUnit); 170 171extern RegLocation dvmCompilerGetReturnWideAlt(CompilationUnit *cUnit); 172 173extern RegLocation dvmCompilerGetReturn(CompilationUnit *cUnit); 174 175extern RegLocation dvmCompilerGetReturnAlt(CompilationUnit *cUnit); 176 177/* Clobber any temp associated with an sReg. Could be in either class */ 178extern void dvmCompilerClobberSReg(CompilationUnit *cUnit, int sReg); 179 180/* Return a temp if one is available, -1 otherwise */ 181extern int dvmCompilerAllocFreeTemp(CompilationUnit *cUnit); 182 183/* 184 * Similar to dvmCompilerAllocTemp(), but forces the allocation of a specific 185 * register. No check is made to see if the register was previously 186 * allocated. Use with caution. 187 */ 188extern void dvmCompilerLockTemp(CompilationUnit *cUnit, int reg); 189 190extern RegLocation dvmCompilerWideToNarrow(CompilationUnit *cUnit, 191 RegLocation rl); 192 193/* 194 * Free all allocated temps in the temp pools. Note that this does 195 * not affect the "liveness" of a temp register, which will stay 196 * live until it is either explicitly killed or reallocated. 197 */ 198extern void dvmCompilerResetRegPool(CompilationUnit *cUnit); 199 200extern void dvmCompilerClobberAllRegs(CompilationUnit *cUnit); 201 202extern void dvmCompilerFlushRegWide(CompilationUnit *cUnit, int reg1, int reg2); 203 204extern void dvmCompilerFlushReg(CompilationUnit *cUnit, int reg); 205 206/* 207 * Architecture-dependent register allocation routines implemented in 208 * ${TARGET_ARCH}/${TARGET_ARCH_VARIANT}/Ralloc.c 209 */ 210extern int dvmCompilerAllocTypedTempPair(CompilationUnit *cUnit, 211 bool fpHint, int regClass); 212 213extern int dvmCompilerAllocTypedTemp(CompilationUnit *cUnit, bool fpHint, 214 int regClass); 215 216extern ArmLIR* dvmCompilerRegCopy(CompilationUnit *cUnit, int rDest, int rSrc); 217 218extern void dvmCompilerRegCopyWide(CompilationUnit *cUnit, int destLo, 219 int destHi, int srcLo, int srcHi); 220 221extern void dvmCompilerFlushRegImpl(CompilationUnit *cUnit, int rBase, 222 int displacement, int rSrc, OpSize size); 223 224extern void dvmCompilerFlushRegWideImpl(CompilationUnit *cUnit, int rBase, 225 int displacement, int rSrcLo, 226 int rSrcHi); 227