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      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 extern "C" void dvmCompilerTemplateStart(void);
     18 
     19 /*
     20  * This file is included by Codegen-armv5te-vfp.c, and implements architecture
     21  * variant-specific code.
     22  */
     23 
     24 /*
     25  * Determine the initial instruction set to be used for this trace.
     26  * Later components may decide to change this.
     27  */
     28 JitInstructionSetType dvmCompilerInstructionSet(void)
     29 {
     30     return DALVIK_JIT_THUMB;
     31 }
     32 
     33 /* First, declare dvmCompiler_TEMPLATE_XXX for each template */
     34 #define JIT_TEMPLATE(X) extern "C" void dvmCompiler_TEMPLATE_##X();
     35 #include "../../../template/armv5te-vfp/TemplateOpList.h"
     36 #undef JIT_TEMPLATE
     37 
     38 /* Architecture-specific initializations and checks go here */
     39 bool dvmCompilerArchVariantInit(void)
     40 {
     41     int i = 0;
     42 
     43     /*
     44      * Then, populate the templateEntryOffsets array with the offsets from the
     45      * the dvmCompilerTemplateStart symbol for each template.
     46      */
     47 #define JIT_TEMPLATE(X) templateEntryOffsets[i++] = \
     48     (intptr_t) dvmCompiler_TEMPLATE_##X - (intptr_t) dvmCompilerTemplateStart;
     49 #include "../../../template/armv5te-vfp/TemplateOpList.h"
     50 #undef JIT_TEMPLATE
     51 
     52     /* Target-specific configuration */
     53     gDvmJit.jitTableSize = 1 << 9; // 512
     54     gDvmJit.jitTableMask = gDvmJit.jitTableSize - 1;
     55     if (gDvmJit.threshold == 0) {
     56         gDvmJit.threshold = 200;
     57     }
     58     if (gDvmJit.codeCacheSize == DEFAULT_CODE_CACHE_SIZE) {
     59       gDvmJit.codeCacheSize = 512 * 1024;
     60     } else if ((gDvmJit.codeCacheSize == 0) && (gDvm.executionMode == kExecutionModeJit)) {
     61       gDvm.executionMode = kExecutionModeInterpFast;
     62     }
     63     /* Hard limit for Arm of 2M */
     64     assert(gDvmJit.codeCacheSize <= 2 * 1024 * 1024);
     65 
     66 #if defined(WITH_SELF_VERIFICATION)
     67     /* Force into blocking mode */
     68     gDvmJit.blockingMode = true;
     69     gDvm.nativeDebuggerActive = true;
     70 #endif
     71 
     72     /* Codegen-specific assumptions */
     73     assert(OFFSETOF_MEMBER(ClassObject, vtable) < 128 &&
     74            (OFFSETOF_MEMBER(ClassObject, vtable) & 0x3) == 0);
     75     assert(OFFSETOF_MEMBER(ArrayObject, length) < 128 &&
     76            (OFFSETOF_MEMBER(ArrayObject, length) & 0x3) == 0);
     77     assert(OFFSETOF_MEMBER(ArrayObject, contents) < 256);
     78 
     79     /* Up to 5 args are pushed on top of FP - sizeofStackSaveArea */
     80     assert(sizeof(StackSaveArea) < 236);
     81 
     82     /*
     83      * EA is calculated by doing "Rn + imm5 << 2". Make sure that the last
     84      * offset from the struct is less than 128.
     85      */
     86     if ((offsetof(Thread, jitToInterpEntries) +
     87          sizeof(struct JitToInterpEntries)) >= 128) {
     88         ALOGE("Thread.jitToInterpEntries size overflow");
     89         dvmAbort();
     90     }
     91 
     92     /* No method JIT for Thumb backend */
     93     gDvmJit.disableOpt |= (1 << kMethodJit);
     94 
     95     // Make sure all threads have current values
     96     dvmJitUpdateThreadStateAll();
     97 
     98     return true;
     99 }
    100 
    101 int dvmCompilerTargetOptHint(int key)
    102 {
    103     int res;
    104     switch (key) {
    105         case kMaxHoistDistance:
    106             res = 2;
    107             break;
    108         default:
    109             ALOGE("Unknown target optimization hint key: %d",key);
    110             res = 0;
    111     }
    112     return res;
    113 }
    114 
    115 void dvmCompilerGenMemBarrier(CompilationUnit *cUnit, int barrierKind)
    116 {
    117 #if ANDROID_SMP != 0
    118 #error armv5+smp not supported
    119 #endif
    120 }
    121