Home | History | Annotate | Download | only in mterp 
      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 #if defined(__mips__)
     56     const int width = 128;
     57 #else
     58     const int width = 64;
     59 #endif
     60     int interpSize = (uintptr_t) dvmAsmInstructionEnd -
     61                      (uintptr_t) dvmAsmInstructionStart;
     62     if (interpSize != 0 && interpSize != kNumPackedOpcodes*width) {
     63         ALOGE("ERROR: unexpected asm interp size %d", interpSize);
     64         ALOGE("(did an instruction handler exceed %d bytes?)", width);
     65         dvmAbort();
     66     }
     67 #endif
     68 
     69 #endif // ndef DVM_NO_ASM_INTERP
     70 
     71     return !failed;
     72 }
     73 
     74 
     75 /*
     76  * "Mterp entry point.
     77  */
     78 void dvmMterpStd(Thread* self)
     79 {
     80     /* configure mterp items */
     81     self->interpSave.methodClassDex = self->interpSave.method->clazz->pDvmDex;
     82 
     83     IF_LOGVV() {
     84         char* desc = dexProtoCopyMethodDescriptor(
     85                          &self->interpSave.method->prototype);
     86         LOGVV("mterp threadid=%d : %s.%s %s",
     87             dvmThreadSelf()->threadId,
     88             self->interpSave.method->clazz->descriptor,
     89             self->interpSave.method->name,
     90             desc);
     91         free(desc);
     92     }
     93     //ALOGI("self is %p, pc=%p, fp=%p", self, self->interpSave.pc,
     94     //      self->interpSave.curFrame);
     95     //ALOGI("first instruction is 0x%04x", self->interpSave.pc[0]);
     96 
     97     /*
     98      * Handle any ongoing profiling and prep for debugging
     99      */
    100     if (self->interpBreak.ctl.subMode != 0) {
    101         TRACE_METHOD_ENTER(self, self->interpSave.method);
    102         self->debugIsMethodEntry = true;   // Always true on startup
    103     }
    104 
    105     dvmMterpStdRun(self);
    106 
    107 #ifdef LOG_INSTR
    108     ALOGD("|-- Leaving interpreter loop");
    109 #endif
    110 }
    111