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https://issues.apache.org/jira/browse/HDFS-7010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14160885#comment-14160885
]
Haohui Mai commented on HDFS-7010:
----------------------------------
I wonder, why the code needs to unwind the stack?
{code}
+static const std::string SymbolizeAndDemangle(void * pc) {
+ std::vector<char> buffer(1024);
+ std::ostringstream ss;
+ uint64_t pc0 = reinterpret_cast<uintptr_t>(pc);
+ uint64_t start_address = 0;
+ int object_fd = OpenObjectFileContainingPcAndGetStartAddress(pc0,
+ start_address);
+
+ if (object_fd == -1) {
+ return DEFAULT_STACK_PREFIX"Unknown";
+ }
+
+ FileDescriptor wrapped_object_fd(object_fd);
+ int elf_type = FileGetElfType(wrapped_object_fd.get());
+
+ if (elf_type == -1) {
+ return DEFAULT_STACK_PREFIX"Unknown";
+ }
+
+ if (!GetSymbolFromObjectFile(wrapped_object_fd.get(), pc0,
+ &buffer[0], buffer.size(), start_address)) {
+ return DEFAULT_STACK_PREFIX"Unknown";
+ }
+
+ ss << DEFAULT_STACK_PREFIX << DemangleSymbol(&buffer[0]);
+ return ss.str();
+}
+
+#elif defined(OS_MACOSX) && defined(HAVE_DLADDR)
+
+static const std::string SymbolizeAndDemangle(void * pc) {
+ Dl_info info;
+ std::ostringstream ss;
+
+ if (dladdr(pc, &info) && info.dli_sname) {
+ ss << DEFAULT_STACK_PREFIX << DemangleSymbol(info.dli_sname);
+ } else {
+ ss << DEFAULT_STACK_PREFIX << "Unknown";
+ }
+
+ return ss.str();
+}
+
+#endif
+
+const std::string PrintStack(int skip, int maxDepth) {
+ std::ostringstream ss;
+ std::vector<void *> stack;
+ GetStack(skip + 1, maxDepth, stack);
+
+ for (size_t i = 0; i < stack.size(); ++i) {
+ ss << SymbolizeAndDemangle(stack[i]) << std::endl;
+ }
+
+ return ss.str();
+}
{code}
> boot up libhdfs3 project
> ------------------------
>
> Key: HDFS-7010
> URL: https://issues.apache.org/jira/browse/HDFS-7010
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Components: hdfs-client
> Reporter: Zhanwei Wang
> Assignee: Colin Patrick McCabe
> Attachments: HDFS-7010-pnative.003.patch,
> HDFS-7010-pnative.004.patch, HDFS-7010-pnative.004.patch, HDFS-7010.patch
>
>
> boot up libhdfs3 project with CMake, Readme and license file.
> Integrate google mock and google test
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