Mterp.cpp revision 062bf509a77fce9dfcb7e7b2e401cf2a124d83d5 
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 */
29bool 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        LOGE("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        LOGE("ERROR: unexpected asm interp size %d", interpSize);
60        LOGE("(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 */
74void 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    //LOGI("self is %p, pc=%p, fp=%p", self, self->interpSave.pc,
90    //      self->interpSave.curFrame);
91    //LOGI("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