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      1 /*
      2  * Copyright (C) 2008 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  * Mterp entry point and support functions.
     19  */
     20 #include "Dalvik.h"
     21 #include "mterp/Mterp.h"
     22 
     23 #include <stddef.h>
     24 
     25 
     26 /*
     27  * Verify some constants used by the mterp interpreter.
     28  */
     29 bool dvmCheckAsmConstants()
     30 {
     31     bool failed = false;
     32 
     33 #ifndef DVM_NO_ASM_INTERP
     34 
     35 #ifndef DVM_JMP_TABLE_MTERP
     36     extern void* dvmAsmInstructionStart[];
     37     extern void* dvmAsmInstructionEnd[];
     38 #endif
     39 
     40 #define ASM_DEF_VERIFY
     41 #include "mterp/common/asm-constants.h"
     42 
     43     if (failed) {
     44         ALOGE("Please correct the values in mterp/common/asm-constants.h");
     45         dvmAbort();
     46     }
     47 
     48 #ifndef DVM_JMP_TABLE_MTERP
     49     /*
     50      * If we're using computed goto instruction transitions, make sure
     51      * none of the handlers overflows the 64-byte limit.  This won't tell
     52      * which one did, but if any one is too big the total size will
     53      * overflow.
     54      */
     55     const int width = 64;
     56     int interpSize = (uintptr_t) dvmAsmInstructionEnd -
     57                      (uintptr_t) dvmAsmInstructionStart;
     58     if (interpSize != 0 && interpSize != kNumPackedOpcodes*width) {
     59         ALOGE("ERROR: unexpected asm interp size %d", interpSize);
     60         ALOGE("(did an instruction handler exceed %d bytes?)", width);
     61         dvmAbort();
     62     }
     63 #endif
     64 
     65 #endif // ndef DVM_NO_ASM_INTERP
     66 
     67     return !failed;
     68 }
     69 
     70 
     71 /*
     72  * "Mterp entry point.
     73  */
     74 void dvmMterpStd(Thread* self)
     75 {
     76     /* configure mterp items */
     77     self->interpSave.methodClassDex = self->interpSave.method->clazz->pDvmDex;
     78 
     79     IF_LOGVV() {
     80         char* desc = dexProtoCopyMethodDescriptor(
     81                          &self->interpSave.method->prototype);
     82         LOGVV("mterp threadid=%d : %s.%s %s",
     83             dvmThreadSelf()->threadId,
     84             self->interpSave.method->clazz->descriptor,
     85             self->interpSave.method->name,
     86             desc);
     87         free(desc);
     88     }
     89     //ALOGI("self is %p, pc=%p, fp=%p", self, self->interpSave.pc,
     90     //      self->interpSave.curFrame);
     91     //ALOGI("first instruction is 0x%04x", self->interpSave.pc[0]);
     92 
     93     /*
     94      * Handle any ongoing profiling and prep for debugging
     95      */
     96     if (self->interpBreak.ctl.subMode != 0) {
     97         TRACE_METHOD_ENTER(self, self->interpSave.method);
     98         self->debugIsMethodEntry = true;   // Always true on startup
     99     }
    100 
    101     dvmMterpStdRun(self);
    102 
    103 #ifdef LOG_INSTR
    104     ALOGD("|-- Leaving interpreter loop");
    105 #endif
    106 }
    107