ArchVariant.cpp revision bbbe552a31f7229708bfc748480ce538218ae076 
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
17extern "C" void dvmCompilerTemplateStart(void);
18
19/*
20 * This file is included by Codegen-armv5te.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 */
28JitInstructionSetType 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/TemplateOpList.h"
36#undef JIT_TEMPLATE
37
38/* Architecture-specific initializations and checks go here */
39bool 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/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
101int 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
115void dvmCompilerGenMemBarrier(CompilationUnit *cUnit, int barrierKind)
116{
117#if ANDROID_SMP != 0
118#error armv5+smp not supported
119#endif
120}
121