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 register alloction support and is intended to be 19 * included by: 20 * 21 * Codegen-$(TARGET_ARCH_VARIANT).c 22 * 23 */ 24 25 #include "compiler/CompilerUtility.h" 26 #include "compiler/CompilerIR.h" 27 #include "compiler/Dataflow.h" 28 #include "compiler/codegen/arm/ArmLIR.h" 29 30 static inline int dvmCompilerS2VReg(CompilationUnit *cUnit, int sReg) 31 { 32 assert(sReg != INVALID_SREG); 33 return DECODE_REG(dvmConvertSSARegToDalvik(cUnit, sReg)); 34 } 35 36 /* Reset the tracker to unknown state */ 37 static inline void dvmCompilerResetNullCheck(CompilationUnit *cUnit) 38 { 39 dvmClearAllBits(cUnit->regPool->nullCheckedRegs); 40 } 41 42 /* 43 * Get the "real" sreg number associated with an sReg slot. In general, 44 * sReg values passed through codegen are the SSA names created by 45 * dataflow analysis and refer to slot numbers in the cUnit->regLocation 46 * array. However, renaming is accomplished by simply replacing RegLocation 47 * entries in the cUnit->reglocation[] array. Therefore, when location 48 * records for operands are first created, we need to ask the locRecord 49 * identified by the dataflow pass what it's new name is. 50 */ 51 52 static inline int dvmCompilerSRegHi(int lowSreg) { 53 return (lowSreg == INVALID_SREG) ? INVALID_SREG : lowSreg + 1; 54 } 55 56 57 static inline bool dvmCompilerLiveOut(CompilationUnit *cUnit, int sReg) 58 { 59 //TODO: fully implement 60 return true; 61 } 62 63 static inline int dvmCompilerSSASrc(MIR *mir, int num) 64 { 65 assert(mir->ssaRep->numUses > num); 66 return mir->ssaRep->uses[num]; 67 } 68 69 extern RegLocation dvmCompilerEvalLoc(CompilationUnit *cUnit, RegLocation loc, 70 int regClass, bool update); 71 /* Mark a temp register as dead. Does not affect allocation state. */ 72 extern void dvmCompilerClobber(CompilationUnit *cUnit, int reg); 73 74 extern RegLocation dvmCompilerUpdateLoc(CompilationUnit *cUnit, 75 RegLocation loc); 76 77 /* see comments for updateLoc */ 78 extern RegLocation dvmCompilerUpdateLocWide(CompilationUnit *cUnit, 79 RegLocation loc); 80 81 /* Clobber all of the temps that might be used by a handler. */ 82 extern void dvmCompilerClobberHandlerRegs(CompilationUnit *cUnit); 83 84 extern void dvmCompilerMarkLive(CompilationUnit *cUnit, int reg, int sReg); 85 86 extern void dvmCompilerMarkDirty(CompilationUnit *cUnit, int reg); 87 88 extern void dvmCompilerMarkPair(CompilationUnit *cUnit, int lowReg, 89 int highReg); 90 91 extern void dvmCompilerMarkClean(CompilationUnit *cUnit, int reg); 92 93 extern void dvmCompilerResetDef(CompilationUnit *cUnit, int reg); 94 95 extern void dvmCompilerResetDefLoc(CompilationUnit *cUnit, RegLocation rl); 96 97 /* Set up temp & preserved register pools specialized by target */ 98 extern void dvmCompilerInitPool(RegisterInfo *regs, int *regNums, int num); 99 100 /* 101 * Mark the beginning and end LIR of a def sequence. Note that 102 * on entry start points to the LIR prior to the beginning of the 103 * sequence. 104 */ 105 extern void dvmCompilerMarkDef(CompilationUnit *cUnit, RegLocation rl, 106 LIR *start, LIR *finish); 107 /* 108 * Mark the beginning and end LIR of a def sequence. Note that 109 * on entry start points to the LIR prior to the beginning of the 110 * sequence. 111 */ 112 extern void dvmCompilerMarkDefWide(CompilationUnit *cUnit, RegLocation rl, 113 LIR *start, LIR *finish); 114 115 extern RegLocation dvmCompilerGetSrcWide(CompilationUnit *cUnit, MIR *mir, 116 int low, int high); 117 118 extern RegLocation dvmCompilerGetDestWide(CompilationUnit *cUnit, MIR *mir, 119 int low, int high); 120 // Get the LocRecord associated with an SSA name use. 121 extern RegLocation dvmCompilerGetSrc(CompilationUnit *cUnit, MIR *mir, int num); 122 123 // Get the LocRecord associated with an SSA name def. 124 extern RegLocation dvmCompilerGetDest(CompilationUnit *cUnit, MIR *mir, 125 int num); 126 127 extern RegLocation dvmCompilerGetReturnWide(CompilationUnit *cUnit); 128 129 /* Clobber all regs that might be used by an external C call */ 130 extern void dvmCompilerClobberCallRegs(CompilationUnit *cUnit); 131 132 extern RegisterInfo *dvmCompilerIsTemp(CompilationUnit *cUnit, int reg); 133 134 extern void dvmCompilerMarkInUse(CompilationUnit *cUnit, int reg); 135 136 extern int dvmCompilerAllocTemp(CompilationUnit *cUnit); 137 138 extern int dvmCompilerAllocTempFloat(CompilationUnit *cUnit); 139 140 //REDO: too many assumptions. 141 extern int dvmCompilerAllocTempDouble(CompilationUnit *cUnit); 142 143 extern void dvmCompilerFreeTemp(CompilationUnit *cUnit, int reg); 144 145 extern void dvmCompilerResetDefLocWide(CompilationUnit *cUnit, RegLocation rl); 146 147 extern void dvmCompilerResetDefTracking(CompilationUnit *cUnit); 148 149 /* Kill the corresponding bit in the null-checked register list */ 150 extern void dvmCompilerKillNullCheckedLoc(CompilationUnit *cUnit, 151 RegLocation loc); 152 153 //FIXME - this needs to also check the preserved pool. 154 extern RegisterInfo *dvmCompilerIsLive(CompilationUnit *cUnit, int reg); 155 156 /* To be used when explicitly managing register use */ 157 extern void dvmCompilerLockAllTemps(CompilationUnit *cUnit); 158 159 extern void dvmCompilerFlushAllRegs(CompilationUnit *cUnit); 160 161 extern RegLocation dvmCompilerGetReturnWideAlt(CompilationUnit *cUnit); 162 163 extern RegLocation dvmCompilerGetReturn(CompilationUnit *cUnit); 164 165 extern RegLocation dvmCompilerGetReturnAlt(CompilationUnit *cUnit); 166 167 /* Clobber any temp associated with an sReg. Could be in either class */ 168 extern void dvmCompilerClobberSReg(CompilationUnit *cUnit, int sReg); 169 170 /* Return a temp if one is available, -1 otherwise */ 171 extern int dvmCompilerAllocFreeTemp(CompilationUnit *cUnit); 172 173 /* 174 * Similar to dvmCompilerAllocTemp(), but forces the allocation of a specific 175 * register. No check is made to see if the register was previously 176 * allocated. Use with caution. 177 */ 178 extern void dvmCompilerLockTemp(CompilationUnit *cUnit, int reg); 179 180 extern RegLocation dvmCompilerWideToNarrow(CompilationUnit *cUnit, 181 RegLocation rl); 182 183 /* 184 * Free all allocated temps in the temp pools. Note that this does 185 * not affect the "liveness" of a temp register, which will stay 186 * live until it is either explicitly killed or reallocated. 187 */ 188 extern void dvmCompilerResetRegPool(CompilationUnit *cUnit); 189 190 extern void dvmCompilerClobberAllRegs(CompilationUnit *cUnit); 191 192 extern void dvmCompilerResetDefTracking(CompilationUnit *cUnit); 193
