Added call stack printing functionality for Linux

Common/DebugUtil.cpp

@@ -59,8 +59,67 @@ void DebugUtil::PrintCallStack()
     std::cerr << std::endl;
 
     free(symbolInfo);
-#endif // _WIN32
-
+#else
+    std::cerr << std::endl << "[CALL STACK]" << std::endl;
+    
+    unsigned int MAX_NUM_FRAMES= 1024;
+    void* backtraceAddresses[MAX_NUM_FRAMES];
+    unsigned int numFrames = backtrace(backtraceAddresses, MAX_NUM_FRAMES);
+    char** symbolList = backtrace_symbols(backtraceAddresses, numFrames);
+    
+    for (unsigned int i = 0; i < numFrames; i++)
+    {
+        char* beginName = NULL;
+        char* beginOffset = NULL;
+        char* endOffset = NULL;
+ 
+        // Find parentheses and +address offset surrounding the mangled name
+        for (char* p = symbolList[i]; *p; ++p)
+        {
+            if (*p == '(')
+                beginName = p;
+            else if (*p == '+')
+                beginOffset = p;            
+            else if ((*p == ')') && (beginOffset || beginName))
+                endOffset = p;
+        }
+        
+        if (beginName && endOffset && (beginName < endOffset))
+        {
+            *beginName++ = '\0';
+            *endOffset++ = '\0';
+            if (beginOffset)
+                *beginOffset++ = '\0';
+            
+            // Mangled name is now in [beginName, beginOffset) and caller offset in [beginOffset, endOffset). 
+            int status = 0;
+            unsigned int MAX_FUNCNAME_SIZE= 4096;            
+            size_t funcNameSize = MAX_FUNCNAME_SIZE;
+            char funcName[MAX_FUNCNAME_SIZE];
+            char* ret = abi::__cxa_demangle(beginName, funcName, &funcNameSize, &status);
+            char* fName = beginName;
+            if (status == 0) 
+                fName = ret;
+            
+            if (beginOffset)
+            {
+                fprintf(stderr, "  %-30s ( %-40s  + %-6s) %s\n", symbolList[i], fName, beginOffset, endOffset);                
+            }
+            else
+            {
+                fprintf(stderr, "  %-30s ( %-40s    %-6s) %s\n", symbolList[i], fName, "", endOffset);
+            }
+        }
+        else
+        {
+            // Couldn't parse the line. Print the whole line.
+            fprintf(stderr, "  %-30s\n", symbolList[i]);          
+        }
+    }
+    
+    free(symbolList);
+#endif
+    
 }
 
 }}}

Common/Include/DebugUtil.h

@@ -11,9 +11,13 @@
 #include <windows.h>
 #include "DbgHelp.h"
 #include <WinBase.h>
-#include <iostream>
 #pragma comment(lib, "Dbghelp.lib")
-#endif    // _WIN32
+#else
+#include <execinfo.h>
+#include <cxxabi.h>
+#endif
+
+#include <iostream>
 
 namespace Microsoft { namespace MSR { namespace CNTK {
 

Makefile

@@ -150,6 +150,7 @@ ifeq ("$(BUILDTYPE)","debug")
   endif
 
   CXXFLAGS += -g
+  LDFLAGS += -rdynamic
   CPPFLAGS += -D_DEBUG
   CUFLAGS += -O0 -use_fast_math -lineinfo  $(GENCODE_FLAGS)
 endif