Android 如何使用NDK工具用源代码编译库？

如何用源代码编译库

我正在用android ndk开发本机库。 有时我会收到logcat的崩溃转储消息

06-18 15:24:58.545: INFO/DEBUG(24667): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
06-18 15:24:58.545: INFO/DEBUG(24667): Build fingerprint: 'nvidia/harmony/harmony/harmony:2.2/FRF91/20110304.134348:eng/test-keys'
06-18 15:24:58.545: INFO/DEBUG(24667): pid: 25870, tid: 26261  >>> com.andtv <<<
06-18 15:24:58.545: INFO/DEBUG(24667): signal 11 (SIGSEGV), fault addr 4a7b041c
06-18 15:24:58.545: INFO/DEBUG(24667):  r0 4a7b041c  r1 4a75220c  r2 00000200  r3 0000006d
06-18 15:24:58.545: INFO/DEBUG(24667):  r4 4a7b041d  r5 00000000  r6 82434ad0  r7 4a752768
06-18 15:24:58.545: INFO/DEBUG(24667):  r8 4a75220c  r9 000004b4  10 4a752777  fp 00000000
06-18 15:24:58.545: INFO/DEBUG(24667):  ip 00000000  sp 4a7521f8  lr 8202e11f  pc afd1d9cc  cpsr 00000030
06-18 15:24:58.545: INFO/DEBUG(24667):  d0  3fcc745e0ab0ad85  d1  3fd24aaf828e1369
06-18 15:24:58.545: INFO/DEBUG(24667):  d2  3fa56e5ff7cd8dc6  d3  3fe5568b9401f367
06-18 15:24:58.545: INFO/DEBUG(24667):  d4  bfc34e892d87a4ea  d5  bfd1c2b0f8ac7dc9
06-18 15:24:58.545: INFO/DEBUG(24667):  d6  3fe62e42fee00000  d7  3ff0000000000000
06-18 15:24:58.545: INFO/DEBUG(24667):  d8  4190000044038000  d9  4260000000000000
06-18 15:24:58.545: INFO/DEBUG(24667):  d10 423999a0423999a0  d11 0000000000000000
06-18 15:24:58.545: INFO/DEBUG(24667):  d12 0000000000000000  d13 0000000000000000
06-18 15:24:58.545: INFO/DEBUG(24667):  d14 0000000000000000  d15 0000000000000000
06-18 15:24:58.545: INFO/DEBUG(24667):  scr 80000012
06-18 15:24:58.565: ERROR/OMXPlayer(942): waiting to prepare 0x2b8fb0
06-18 15:24:58.925: INFO/DEBUG(24667):          #00  pc 0001d9cc  /system/lib/libc.so
06-18 15:24:58.925: INFO/DEBUG(24667):          #01  pc 0002e11c  /data/data/com.andtv/lib/libffmpeg.so

但是输出文本中没有源代码，只有汇编代码。 我在ndk5r中使用示例hello jni项目：

qty:jni qrtt1$ arm-eabi-objdump -S ../libs/armeabi/libhello-jni.so 

../libs/armeabi/libhello-jni.so:     file format elf32-littlearm


Disassembly of section .text:

000002dc <Java_com_example_hellojni_HelloJni_stringFromJNI>:
 2dc:   b500            push    {lr}
 2de:   b083            sub     sp, #12
 2e0:   9001            str     r0, [sp, #4]
 2e2:   9100            str     r1, [sp, #0]
 2e4:   9b01            ldr     r3, [sp, #4]
 2e6:   681a            ldr     r2, [r3, #0]
 2e8:   23a7            movs    r3, #167
 2ea:   009b            lsls    r3, r3, #2
 2ec:   58d2            ldr     r2, [r2, r3]
 2ee:   9901            ldr     r1, [sp, #4]
 2f0:   4b04            ldr     r3, [pc, #16]   (304 <Java_com_example_hellojni_HelloJni_stringFromJNI+0x28>)
 2f2:   447b            add     r3, pc
 2f4:   1c08            adds    r0, r1, #0
 2f6:   1c19            adds    r1, r3, #0
 2f8:   4790            blx     r2
 2fa:   1c03            adds    r3, r0, #0
 2fc:   1c18            adds    r0, r3, #0
 2fe:   b003            add     sp, #12
 300:   bd00            pop     {pc}
 302:   46c0            nop                     (mov r8, r8)
 304:   0012            lsls    r2, r2, #0

该命令将删除我的调试符号：

/Users/qrtt1/app/android-ndk-r5b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/darwin-x86/bin/arm-linux-androideabi-strip --strip-unneeded  /Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/libs/armeabi/libhello-jni.so

我不知道如何禁用strip命令，因为我的ndk版本不同。但是，我可以使用.so在路径中剥离之前：

/Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so

源代码已返回：

qty:jni qrtt1$ arm-eabi-objdump -S /Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so

/Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so:     file format elf32-littlearm


Disassembly of section .text:

000002dc <Java_com_example_hellojni_HelloJni_stringFromJNI>:
 *   apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java
 */
jstring
Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
                                                  jobject thiz )
{
 2dc:   b500            push    {lr}
 2de:   b083            sub     sp, #12
 2e0:   9001            str     r0, [sp, #4]
 2e2:   9100            str     r1, [sp, #0]
    return (*env)->NewStringUTF(env, "Hello from JNI !");
 2e4:   9b01            ldr     r3, [sp, #4]
 2e6:   681a            ldr     r2, [r3, #0]
 2e8:   23a7            movs    r3, #167
 2ea:   009b            lsls    r3, r3, #2
 2ec:   58d2            ldr     r2, [r2, r3]
 2ee:   9901            ldr     r1, [sp, #4]
 2f0:   4b04            ldr     r3, [pc, #16]   (304 <Java_com_example_hellojni_HelloJni_stringFromJNI+0x28>)
 2f2:   447b            add     r3, pc
 2f4:   1c08            adds    r0, r1, #0
 2f6:   1c19            adds    r1, r3, #0
 2f8:   4790            blx     r2
 2fa:   1c03            adds    r3, r0, #0
}
 2fc:   1c18            adds    r0, r3, #0
 2fe:   b003            add     sp, #12
 300:   bd00            pop     {pc}
 302:   46c0            nop                     (mov r8, r8)
 304:   00000012        .word   0x00000012

qty:jni qrtt1$arm-eabi-objdump-S/Users/qrt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so
/Users/qrt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so：文件格式elf32 littleram
第节的分解。正文：
000002dc：
*apps/samples/hello jni/project/src/com/example/HelloJni/HelloJni.java
*/
jstring
Java_com_示例_hellojni_hellojni_stringFromJNI（JNIEnv*env，
jobject thiz）
{
2dc:b500推送{lr}
2de:b083子sp，#12
2e0:9001 str r0[sp，#4]
2e2:9100 str r1[sp，#0]
return（*env）->NewStringUTF（env，“来自JNI的你好！”）；
2e4:9b01 ldr r3[sp，#4]
2e6:681a ldr r2[r3，#0]
2e8:23a7 movs r3，#167
2ea:009b lsls r3，r3，#2
2ec:58d2 ldr r2[r2，r3]
2ee:9901 ldr r1[sp，#4]
2f0:4b04 ldr r3[pc，#16]（304）
2f2:447b添加r3，pc
2f4:1c08加上r0，r1，#0
2f6:1c19加上r1，r3，#0
2f8:4790 blx r2
2fa:1c03加上r3、r0和#0
}
2fc:1c18加上r0、r3和#0
2fe:b003添加sp，#12
300:bd00 pop{pc}
302:46c0 nop（mov r8，r8）
304:00000012.字0x00000012

---

将保留符号以进行调试。

我已尝试过，但似乎不正常/Users/qrt1/app/android-ndk-r5b/samples/hello-jni/libs/armeabi/libhello-jni.so:ELF 32位LSB共享对象，ARM，版本1（SYSV），动态链接，剥离。另外，我使用android-ndk-r5bHmm，在我的例子中，obj/local/armeabi/libhello-jni.so总是“不剥离”。不在libs/armeabi下，在obj/local/armeabi下。

/Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so

qty:jni qrtt1$ arm-eabi-objdump -S /Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so

/Users/qrtt1/app/android-ndk-r5b/samples/hello-jni/obj/local/armeabi/libhello-jni.so:     file format elf32-littlearm


Disassembly of section .text:

000002dc <Java_com_example_hellojni_HelloJni_stringFromJNI>:
 *   apps/samples/hello-jni/project/src/com/example/HelloJni/HelloJni.java
 */
jstring
Java_com_example_hellojni_HelloJni_stringFromJNI( JNIEnv* env,
                                                  jobject thiz )
{
 2dc:   b500            push    {lr}
 2de:   b083            sub     sp, #12
 2e0:   9001            str     r0, [sp, #4]
 2e2:   9100            str     r1, [sp, #0]
    return (*env)->NewStringUTF(env, "Hello from JNI !");
 2e4:   9b01            ldr     r3, [sp, #4]
 2e6:   681a            ldr     r2, [r3, #0]
 2e8:   23a7            movs    r3, #167
 2ea:   009b            lsls    r3, r3, #2
 2ec:   58d2            ldr     r2, [r2, r3]
 2ee:   9901            ldr     r1, [sp, #4]
 2f0:   4b04            ldr     r3, [pc, #16]   (304 <Java_com_example_hellojni_HelloJni_stringFromJNI+0x28>)
 2f2:   447b            add     r3, pc
 2f4:   1c08            adds    r0, r1, #0
 2f6:   1c19            adds    r1, r3, #0
 2f8:   4790            blx     r2
 2fa:   1c03            adds    r3, r0, #0
}
 2fc:   1c18            adds    r0, r3, #0
 2fe:   b003            add     sp, #12
 300:   bd00            pop     {pc}
 302:   46c0            nop                     (mov r8, r8)
 304:   00000012        .word   0x00000012

ndk-build NDK_DEBUG=1