我正在使用Android NDK将v8嵌入到C ++应用程序中。它在许多设备上运行良好，但它在三星Galaxy Tab 10.1上使用发布的签名APK（Android 4.0.4）崩溃。奇怪的是，调试签名的apk在Galaxy Tab 10.1上运行完美。我在两个调试/发布apks中检查了.so库，两者都是相同的，md5是相同的。
我创建了一个可以重现问题的最小测试用例。我已经测试了许多v8版本（3.22,3.23,3.26等），有许多编译标志（armeabi，armeabi-v7a，-mfpu = vfpv3-d16等），启用或禁用v8快照，但崩溃仍然存在在发布的签名apks中活着。
如果两个本地.so库相等，那么在调试和发布签名的apk之间会出现什么样的区别呢？修复此崩溃的任何解决方法？
这是测试用例的main.cpp
#include "v8.h"
#include <jni.h>
#include <android/log.h>
#define LOGE(...) __android_log_print(ANDROID_LOG_ERROR , "Paradox",__VA_ARGS__)
using namespace v8;
namespace {
void testContext()
{
LOGE("Hellooo!!!");
v8::Isolate* isolate = v8::Isolate::GetCurrent();
v8::Locker v8Lock(isolate);
v8::Isolate::Scope isolateScope(isolate);
v8::HandleScope handle_scope(isolate);
Handle<ObjectTemplate> global_templ = ObjectTemplate::New();
LOGE("Creating V8 Context...");
//crashes while creating this context
v8::Handle<v8::Context> context = v8::Context::New(isolate, 0, global_templ);
LOGE("Created V8 Context");
v8::Context::Scope context_scope(context);
v8::Local<v8::String> source = v8::String::NewFromUtf8(isolate, "'Hello' + ', World! ' + Math.PI");
v8::Local<v8::Script> script = v8::Script::Compile(source);
v8::Handle<v8::Value> result = script->Run();
v8::String::Utf8Value utf8(result);
LOGE("Yehaaaaa: %s", *utf8);
}
}
extern "C"
{
jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
JNIEnv* env;
if (vm->GetEnv(reinterpret_cast<void**>(&env), JNI_VERSION_1_6) != JNI_OK) {
return -1;
}
testContext();
return JNI_VERSION_1_6;
}
}
Application.mk文件
APP_MODULES := Paradox
APP_ABI := armeabi-v7a
APP_PLATFORM := android-9
APP_STL := stlport_static
Android.mk文件
MY_LOCAL_PATH := $(call my-dir)
LOCAL_PATH := /Users/mortimer/Projects/v8/
include $(CLEAR_VARS)
LOCAL_MODULE := v8_android
LOCAL_SRC_FILES := \
/Users/mortimer/Projects/v8/out/android_arm.release/obj.target/tools/gyp/libv8_base.arm.a
include $(PREBUILT_STATIC_LIBRARY)
LOCAL_PATH := /Users/mortimer/Projects/v8/
include $(CLEAR_VARS)
LOCAL_MODULE := v8_android_snapshot
LOCAL_SRC_FILES := \
/Users/mortimer/Projects/v8/out/android_arm.release/obj.target/tools/gyp/libv8_snapshot.a
include $(PREBUILT_STATIC_LIBRARY)
LOCAL_PATH := $(MY_LOCAL_PATH)
include $(CLEAR_VARS)
LOCAL_MODULE := Paradox
LOCAL_C_INCLUDES := \
/Users/mortimer/Projects/v8/include
LOCAL_STATIC_LIBRARIES := \
v8_android \
v8_android_snapshot
LOCAL_LDLIBS := \
-llog \
-lc
LOCAL_SRC_FILES := \
main.cpp
include $(BUILD_SHARED_LIBRARY)
Android活动
package com.mortimer.paradox;
import android.app.Activity;
import android.os.Bundle;
public class ParadoxActivity extends Activity {
/**
* Called when the activity is first created.
*/
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
System.loadLibrary("Paradox");
setContentView(R.layout.main);
}
}
这是崩溃转储：
06-11 09:57:06.960 4198-4198/? D/dalvikvm﹕ Trying to load lib /data/data/com.mortimer.Paradox/lib/libParadox.so 0x4132f028
06-11 09:57:06.970 4198-4198/? D/dalvikvm﹕ Added shared lib /data/data/com.mortimer.Paradox/lib/libParadox.so 0x4132f028
06-11 09:57:06.970 4198-4198/? E/Paradox﹕ Hellooo!!!
06-11 09:57:06.990 4198-4198/? E/Paradox﹕ Creating V8 Context...
06-11 09:57:07.010 4198-4198/? A/libc﹕ Fatal signal 4 (SIGILL) at 0x5c60a310 (code=1)
06-11 09:57:07.150 110-180/? I/AudioPolicyManager﹕ stopOutput() output 1, stream 1, session 15
06-11 09:57:07.170 110-176/? I/AudioFlinger﹕ stop output streamType (0, 1) for 1
06-11 09:57:07.170 110-176/? D/AudioHardware﹕ AudioStreamOutALSA::setParameters() stop_output_streamtype=1
06-11 09:57:07.510 104-104/? I/DEBUG﹕ *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
06-11 09:57:07.510 104-104/? I/DEBUG﹕ Build fingerprint: 'samsung/GT-P7510/GT-P7510:4.0.4/IMM76D/XXLPH:user/release-keys'
06-11 09:57:07.510 104-104/? I/DEBUG﹕ pid: 4198, tid: 4198 >>> com.mortimer.Paradox <<<
06-11 09:57:07.510 104-104/? I/DEBUG﹕ signal 4 (SIGILL), code 1 (ILL_ILLOPC), fault addr 5c60a310
06-11 09:57:07.510 104-104/? I/DEBUG﹕ r0 00000002 r1 5c2080a1 r2 00000002 r3 3d93a1dd
06-11 09:57:07.510 104-104/? I/DEBUG﹕ r4 3d908091 r5 3d908091 r6 be859398 r7 3d908091
06-11 09:57:07.510 104-104/? I/DEBUG﹕ r8 3d933711 r9 0000000c 10 00a6888c fp be859390
06-11 09:57:07.510 104-104/? I/DEBUG﹕ ip 00000056 sp be859384 lr 3ae51f18 pc 5c60a310 cpsr 20000010
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d0 431684be42700568 d1 3ff000004315d32c
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d2 457ff80000000fff d3 000000003f000000
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d4 00001fff00000000 d5 3fe999999999999a
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d6 3fe8000000000000 d7 3f8000003f4ccccd
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d8 0000000000000000 d9 0000000000000000
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d10 0000000000000000 d11 0000000000000000
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d12 0000000000000000 d13 0000000000000000
06-11 09:57:07.510 104-104/? I/DEBUG﹕ d14 0000000000000000 d15 0000000000000000
06-11 09:57:07.510 104-104/? I/DEBUG﹕ scr 62000010
06-11 09:57:07.650 104-104/? I/DEBUG﹕ #00 pc 5c60a310
06-11 09:57:07.650 104-104/? I/DEBUG﹕ #01 lr 3ae51f18
06-11 09:57:07.650 104-104/? I/DEBUG﹕ code around pc:
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60a2f0 ea000002 e3a0c03f e52dc004 eaffffff ....?.....-.....
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60a300 e307c1b8 e345cbfb e59cc000 e31c0040 ......E.....@...
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60a310 1d6d0b20 024dd080 ed2d0b1c e92dffff .m...M...-...-.
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60a320 e59d2130 e1a0300e e28d4f4d e04b4004 0!...0..MO...@K.
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60a330 e1a0500d e24dd00c e3cdd007 e58d5008 .P....M......P..
06-11 09:57:07.660 104-104/? I/DEBUG﹕ code around lr:
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 3ae51ef8 e30ac000 e345cc60 e92d4900 e3a0900c ....`.E..I-.....
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 3ae51f08 e52d9004 e28db008 e1a0e00f e1a0f00c ..-.............
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 3ae51f18 e30ac00c e345cc60 eafffff6 00000001 ....`.E.........
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 3ae51f28 00000002 000000b4 1fffffff 00000134 ............4...
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 3ae51f38 00000000 00000000 37d08289 0000032c ...........7,...
06-11 09:57:07.660 104-104/? I/DEBUG﹕ memory map around addr 5c60a310:
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c609000-5c60a000
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60a000-5c60b000
06-11 09:57:07.660 104-104/? I/DEBUG﹕ 5c60b000-5c63c000
06-11 09:57:07.660 104-104/? I/DEBUG﹕ stack:
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859344 00a6a268 [heap]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859348 00a68880 [heap]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be85934c 00bd1738 [heap]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859350 00bd13ec [heap]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859354 3d933711
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859358 3d908091
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be85935c 00a6888c [heap]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859360 be859390 [stack]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859364 5bd7c188 /data/data/com.mortimer.paradox/lib/libParadox.so
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859368 00000001
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be85936c 5bd7c0f8 /data/data/com.mortimer.paradox/lib/libParadox.so
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859370 be859398 [stack]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859374 3d908091
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859378 df0027ad
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be85937c 00000000
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859380 3ae0be7c
06-11 09:57:07.660 104-104/? I/DEBUG﹕ #00 be859384 00000001
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859388 0000000c
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be85938c 3d933711
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859390 be8593dc [stack]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859394 3ae52748
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be859398 3d942861
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be85939c be85947c [stack]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593a0 3ae52381
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593a4 00000001
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593a8 3d933711
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593ac be8593dc [stack]
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593b0 3d908091
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593b4 3d908091
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593b8 3d908091
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593bc 00000000
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593c0 00000000
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593c4 3d942861
06-11 09:57:07.660 104-104/? I/DEBUG﹕ be8593c8 3d9080c1
答案 0 :(得分：4)
经过一些v8内部调试后，我已经修复了问题
问题是V8 cpu功能检测。 V8通过/ proc / cpuinfo提取内核公开的信息。这是Galaxy Tab 10.1的CPUInfo
E/Paradox ( 9512): Info-> Processor : ARMv7 Processor rev 0 (v7l)
E/Paradox ( 9512): processor : 0
E/Paradox ( 9512): BogoMIPS : 1998.84
E/Paradox ( 9512):
E/Paradox ( 9512): processor : 1
E/Paradox ( 9512): BogoMIPS : 1998.84
E/Paradox ( 9512):
E/Paradox ( 9512): Features : swp half thumb fastmult vfp edsp vfpv3 vfpv3d16 tls
E/Paradox ( 9512): CPU implementer : 0x41
E/Paradox ( 9512): CPU architecture: 7
E/Paradox ( 9512): CPU variant : 0x1
E/Paradox ( 9512): CPU part : 0xc09
E/Paradox ( 9512): CPU revision : 0
E/Paradox ( 9512):
E/Paradox ( 9512): Hardware : p3
E/Paradox ( 9512): Revision : 000e
E/Paradox ( 9512): Serial : 4641120a0ab4919e
E/Paradox ( 9512): EO DATAAAAAAAAA
问题是feature字段同时包含vfpv3和vfpv3d16值（vfpv3d16是一个有限的vfpv3版本，只有16个64位FPU寄存器）。
V8解析CPUInfo，假设两个值没有同时定义：
if (HasListItem(features, "vfpv3")) {
has_vfp3_ = true;
has_vfp3_d32_ = true;
} else if (HasListItem(features, "vfpv3d16")) {
has_vfp3_ = true;
}
修复：只需将else更改为新的if，并将has_vfp3_d32_设置为false
if (HasListItem(features, "vfpv3")) {
has_vfp3_ = true;
has_vfp3_d32_ = true;
}
if (HasListItem(features, "vfpv3d16")) {
has_vfp3_ = true;
has_vfp3_d32_ = false;
}
调试和发布签名apk之间的区别在于调试版本V8设法通过ReadELFHWCaps加载数据，但在发布签名的apk中它回退到CPUInfo。