src/compiler/codegen/arm/ArchUtility.cc

/*
 * Copyright (C) 2011 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.
 */

#include "../../CompilerInternals.h"
#include "ArmLIR.h"
#include "../Ralloc.h"

#include <string>

namespace art {

ArmConditionCode oatArmConditionEncoding(ConditionCode code)
{
    ArmConditionCode res;
    switch (code) {
        case kCondEq: res = kArmCondEq; break;
        case kCondNe: res = kArmCondNe; break;
        case kCondCs: res = kArmCondCs; break;
        case kCondCc: res = kArmCondCc; break;
        case kCondMi: res = kArmCondMi; break;
        case kCondPl: res = kArmCondPl; break;
        case kCondVs: res = kArmCondVs; break;
        case kCondVc: res = kArmCondVc; break;
        case kCondHi: res = kArmCondHi; break;
        case kCondLs: res = kArmCondLs; break;
        case kCondGe: res = kArmCondGe; break;
        case kCondLt: res = kArmCondLt; break;
        case kCondGt: res = kArmCondGt; break;
        case kCondLe: res = kArmCondLe; break;
        case kCondAl: res = kArmCondAl; break;
        case kCondNv: res = kArmCondNv; break;
        default:
            LOG(FATAL) << "Bad condition code" << (int)code;
            res = (ArmConditionCode)0;  // Quiet gcc
    }
    return res;
}

static const char* coreRegNames[16] = {
    "r0",
    "r1",
    "r2",
    "r3",
    "r4",
    "r5",
    "r6",
    "r7",
    "r8",
    "rSELF",
    "r10",
    "r11",
    "r12",
    "sp",
    "lr",
    "pc",
};


static const char* shiftNames[4] = {
    "lsl",
    "lsr",
    "asr",
    "ror"};

/* Decode and print a ARM register name */
char* decodeRegList(int opcode, int vector, char* buf)
{
    int i;
    bool printed = false;
    buf[0] = 0;
    for (i = 0; i < 16; i++, vector >>= 1) {
        if (vector & 0x1) {
            int regId = i;
            if (opcode == kThumbPush && i == 8) {
                regId = r14lr;
            } else if (opcode == kThumbPop && i == 8) {
                regId = r15pc;
            }
            if (printed) {
                sprintf(buf + strlen(buf), ", r%d", regId);
            } else {
                printed = true;
                sprintf(buf, "r%d", regId);
            }
        }
    }
    return buf;
}

char*  decodeFPCSRegList(int count, int base, char* buf)
{
    sprintf(buf, "s%d", base);
    for (int i = 1; i < count; i++) {
        sprintf(buf + strlen(buf), ", s%d",base + i);
    }
    return buf;
}

int expandImmediate(int value)
{
    int mode = (value & 0xf00) >> 8;
    u4 bits = value & 0xff;
    switch (mode) {
        case 0:
            return bits;
       case 1:
            return (bits << 16) | bits;
       case 2:
            return (bits << 24) | (bits << 8);
       case 3:
            return (bits << 24) | (bits << 16) | (bits << 8) | bits;
      default:
            break;
    }
    bits = (bits | 0x80) << 24;
    return bits >> (((value & 0xf80) >> 7) - 8);
}

const char* ccNames[] = {"eq","ne","cs","cc","mi","pl","vs","vc",
                         "hi","ls","ge","lt","gt","le","al","nv"};
/*
 * Interpret a format string and build a string no longer than size
 * See format key in Assemble.c.
 */
std::string buildInsnString(const char* fmt, LIR* lir,
                            unsigned char* baseAddr)
{
    std::string buf;
    int i;
    const char* fmtEnd = &fmt[strlen(fmt)];
    char tbuf[256];
    const char* name;
    char nc;
    while (fmt < fmtEnd) {
        int operand;
        if (*fmt == '!') {
            fmt++;
            DCHECK_LT(fmt, fmtEnd);
            nc = *fmt++;
            if (nc=='!') {
                strcpy(tbuf, "!");
            } else {
               DCHECK_LT(fmt, fmtEnd);
               DCHECK_LT((unsigned)(nc-'0'), 4U);
               operand = lir->operands[nc-'0'];
               switch (*fmt++) {
                   case 'H':
                       if (operand != 0) {
                           sprintf(tbuf, ", %s %d",shiftNames[operand & 0x3],
                                   operand >> 2);
                       } else {
                           strcpy(tbuf,"");
                       }
                       break;
                   case 'B':
                       switch (operand) {
                           case kSY:
                               name = "sy";
                               break;
                           case kST:
                               name = "st";
                               break;
                           case kISH:
                               name = "ish";
                               break;
                           case kISHST:
                               name = "ishst";
                               break;
                           case kNSH:
                               name = "nsh";
                               break;
                           case kNSHST:
                               name = "shst";
                               break;
                           default:
                               name = "DecodeError2";
                               break;
                       }
                       strcpy(tbuf, name);
                       break;
                   case 'b':
                       strcpy(tbuf,"0000");
                       for (i=3; i>= 0; i--) {
                           tbuf[i] += operand & 1;
                           operand >>= 1;
                       }
                       break;
                   case 'n':
                       operand = ~expandImmediate(operand);
                       sprintf(tbuf,"%d [%#x]", operand, operand);
                       break;
                   case 'm':
                       operand = expandImmediate(operand);
                       sprintf(tbuf,"%d [%#x]", operand, operand);
                       break;
                   case 's':
                       sprintf(tbuf,"s%d",operand & FP_REG_MASK);
                       break;
                   case 'S':
                       sprintf(tbuf,"d%d",(operand & FP_REG_MASK) >> 1);
                       break;
                   case 'h':
                       sprintf(tbuf,"%04x", operand);
                       break;
                   case 'M':
                   case 'd':
                       sprintf(tbuf,"%d", operand);
                       break;
                   case 'C':
                       sprintf(tbuf,"%s",coreRegNames[operand]);
                       break;
                   case 'E':
                       sprintf(tbuf,"%d", operand*4);
                       break;
                   case 'F':
                       sprintf(tbuf,"%d", operand*2);
                       break;
                   case 'c':
                       strcpy(tbuf, ccNames[operand]);
                       break;
                   case 't':
                       sprintf(tbuf,"0x%08x (L%p)",
                               (int) baseAddr + lir->offset + 4 +
                               (operand << 1),
                               lir->target);
                       break;
                   case 'u': {
                       int offset_1 = lir->operands[0];
                       int offset_2 = NEXT_LIR(lir)->operands[0];
                       intptr_t target =
                           ((((intptr_t) baseAddr + lir->offset + 4) &
                            ~3) + (offset_1 << 21 >> 9) + (offset_2 << 1)) &
                           0xfffffffc;
                       sprintf(tbuf, "%p", (void *) target);
                       break;
                    }

                   /* Nothing to print for BLX_2 */
                   case 'v':
                       strcpy(tbuf, "see above");
                       break;
                   case 'R':
                       decodeRegList(lir->opcode, operand, tbuf);
                       break;
                   case 'P':
                       decodeFPCSRegList(operand, 16, tbuf);
                       break;
                   case 'Q':
                       decodeFPCSRegList(operand, 0, tbuf);
                       break;
                   default:
                       strcpy(tbuf,"DecodeError1");
                       break;
                }
                buf += tbuf;
            }
        } else {
           buf += *fmt++;
        }
    }
    return buf;
}

void oatDumpResourceMask(LIR* lir, u8 mask, const char* prefix)
{
    char buf[256];
    buf[0] = 0;
    LIR* armLIR = (LIR*) lir;

    if (mask == ENCODE_ALL) {
        strcpy(buf, "all");
    } else {
        char num[8];
        int i;

        for (i = 0; i < kRegEnd; i++) {
            if (mask & (1ULL << i)) {
                sprintf(num, "%d ", i);
                strcat(buf, num);
            }
        }

        if (mask & ENCODE_CCODE) {
            strcat(buf, "cc ");
        }
        if (mask & ENCODE_FP_STATUS) {
            strcat(buf, "fpcc ");
        }

        /* Memory bits */
        if (armLIR && (mask & ENCODE_DALVIK_REG)) {
            sprintf(buf + strlen(buf), "dr%d%s", armLIR->aliasInfo & 0xffff,
                    (armLIR->aliasInfo & 0x80000000) ? "(+1)" : "");
        }
        if (mask & ENCODE_LITERAL) {
            strcat(buf, "lit ");
        }

        if (mask & ENCODE_HEAP_REF) {
            strcat(buf, "heap ");
        }
        if (mask & ENCODE_MUST_NOT_ALIAS) {
            strcat(buf, "noalias ");
        }
    }
    if (buf[0]) {
        LOG(INFO) << prefix << ": " << buf;
    }
}


}  // namespace art