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jlechner |
// stacktrace.cc - Functions for unwinding & inspecting the call stack.
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/* Copyright (C) 2005 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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#include <config.h>
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#include <jvm.h>
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#include <gcj/cni.h>
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#include <java-interp.h>
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#include <java-stack.h>
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#ifdef HAVE_DLFCN_H
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#include <dlfcn.h>
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#endif
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#include <stdio.h>
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#include <java/lang/Class.h>
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#include <java/lang/Long.h>
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#include <java/util/ArrayList.h>
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#include <java/util/IdentityHashMap.h>
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#include <gnu/java/lang/MainThread.h>
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#include <gnu/gcj/runtime/NameFinder.h>
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#include <sysdep/backtrace.h>
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#include <sysdep/descriptor.h>
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using namespace java::lang;
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using namespace java::lang::reflect;
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using namespace java::util;
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using namespace gnu::gcj::runtime;
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// Maps ncode values to their containing native class.
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// NOTE: Currently this Map contradicts class GC for native classes. This map
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// (and the "new class stack") will need to use WeakReferences in order to
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// enable native class GC.
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static java::util::IdentityHashMap *ncodeMap;
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// Check the "class stack" for any classes initialized since we were last
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// called, and add them to ncodeMap.
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void
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_Jv_StackTrace::UpdateNCodeMap ()
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{
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// The Map should be large enough so that a typical Java app doesn't cause
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// it to rehash, without using too much memory. ~5000 entries should be
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// enough.
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if (ncodeMap == NULL)
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ncodeMap = new java::util::IdentityHashMap (5087);
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jclass klass;
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while ((klass = _Jv_PopClass ()))
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{
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//printf ("got %s\n", klass->name->data);
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#ifdef INTERPRETER
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JvAssert (! _Jv_IsInterpretedClass (klass));
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#endif
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for (int i=0; i < klass->method_count; i++)
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{
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_Jv_Method *method = &klass->methods[i];
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void *ncode = method->ncode;
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// Add non-abstract methods to ncodeMap.
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if (ncode)
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{
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ncode = UNWRAP_FUNCTION_DESCRIPTOR (ncode);
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ncodeMap->put ((java::lang::Object *)ncode, klass);
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}
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}
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}
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}
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// Given a native frame, return the class which this code belongs
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// to. Returns NULL if this IP is not associated with a native Java class.
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// If NCODE is supplied, it will be set with the ip for the entry point of the
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// enclosing method.
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jclass
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_Jv_StackTrace::ClassForFrame (_Jv_StackFrame *frame)
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{
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JvAssert (frame->type == frame_native);
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jclass klass = NULL;
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// use _Unwind_FindEnclosingFunction to find start of method
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//void *entryPoint = _Unwind_FindEnclosingFunction (ip);
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// look it up in ncodeMap
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if (frame->start_ip)
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klass = (jclass) ncodeMap->get ((jobject) frame->start_ip);
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return klass;
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}
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_Unwind_Reason_Code
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_Jv_StackTrace::UnwindTraceFn (struct _Unwind_Context *context, void *state_ptr)
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{
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_Jv_UnwindState *state = (_Jv_UnwindState *) state_ptr;
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jint pos = state->pos;
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// Check if the trace buffer needs to be extended.
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if (pos == state->length)
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{
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int newLength = state->length * 2;
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void *newFrames = _Jv_AllocBytes (newLength * sizeof(_Jv_StackFrame));
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memcpy (newFrames, state->frames, state->length * sizeof(_Jv_StackFrame));
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state->frames = (_Jv_StackFrame *) newFrames;
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state->length = newLength;
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}
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void *func_addr = (void *) _Unwind_GetRegionStart (context);
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// If we see the interpreter's main function, "pop" an entry off the
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// interpreter stack and use that instead, so that the trace goes through
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// the java code and not the interpreter itself. This assumes a 1:1
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// correspondance between call frames in the interpreted stack and occurances
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// of _Jv_InterpMethod::run() on the native stack.
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#ifdef INTERPRETER
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void *interp_run = (void *) &_Jv_InterpMethod::run;
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if (func_addr == UNWRAP_FUNCTION_DESCRIPTOR (interp_run))
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{
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state->frames[pos].type = frame_interpreter;
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state->frames[pos].interp.meth = state->interp_frame->self;
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state->frames[pos].interp.pc = state->interp_frame->pc;
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state->interp_frame = state->interp_frame->next;
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}
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else
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#endif
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{
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state->frames[pos].type = frame_native;
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state->frames[pos].ip = (void *) _Unwind_GetIP (context);
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state->frames[pos].start_ip = func_addr;
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}
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//printf ("unwind ip: %p\n", _Unwind_GetIP (context));
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_Unwind_Reason_Code result = _URC_NO_REASON;
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if (state->trace_function != NULL)
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result = (state->trace_function) (state);
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state->pos++;
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return result;
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}
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// Return a raw stack trace from the current point of execution. The raw
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// trace will include all functions that have unwind info.
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_Jv_StackTrace *
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_Jv_StackTrace::GetStackTrace(void)
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{
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int trace_size = 100;
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_Jv_StackFrame frames[trace_size];
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_Jv_UnwindState state (trace_size);
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state.frames = (_Jv_StackFrame *) &frames;
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#ifdef SJLJ_EXCEPTIONS
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// The Unwind interface doesn't work with the SJLJ exception model.
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// Fall back to a platform-specific unwinder.
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fallback_backtrace (&state);
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#else /* SJLJ_EXCEPTIONS */
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_Unwind_Backtrace (UnwindTraceFn, &state);
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#endif /* SJLJ_EXCEPTIONS */
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// Copy the trace and return it.
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int traceSize = sizeof (_Jv_StackTrace) +
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(sizeof (_Jv_StackFrame) * state.pos);
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_Jv_StackTrace *trace = (_Jv_StackTrace *) _Jv_AllocBytes (traceSize);
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trace->length = state.pos;
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memcpy (trace->frames, state.frames, sizeof (_Jv_StackFrame) * state.pos);
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return trace;
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}
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void
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_Jv_StackTrace::getLineNumberForFrame(_Jv_StackFrame *frame, NameFinder *finder,
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jstring *sourceFileName, jint *lineNum,
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jstring *methodName)
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{
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#ifdef INTERPRETER
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if (frame->type == frame_interpreter)
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{
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_Jv_InterpMethod *interp_meth = frame->interp.meth;
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_Jv_InterpClass *interp_class =
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(_Jv_InterpClass *) interp_meth->defining_class->aux_info;
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*sourceFileName = interp_class->source_file_name;
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*lineNum = interp_meth->get_source_line(frame->interp.pc);
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return;
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}
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#endif
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// Use dladdr() to determine in which binary the address IP resides.
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#if defined (HAVE_DLFCN_H) && defined (HAVE_DLADDR)
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Dl_info info;
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jstring binaryName = NULL;
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const char *argv0 = _Jv_GetSafeArg(0);
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void *ip = frame->ip;
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_Unwind_Ptr offset = 0;
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if (dladdr (ip, &info))
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{
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if (info.dli_fname)
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binaryName = JvNewStringUTF (info.dli_fname);
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else
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return;
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if (*methodName == NULL && info.dli_sname)
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*methodName = JvNewStringUTF (info.dli_sname);
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// addr2line expects relative addresses for shared libraries.
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if (strcmp (info.dli_fname, argv0) == 0)
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offset = (_Unwind_Ptr) ip;
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else
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offset = (_Unwind_Ptr) ip - (_Unwind_Ptr) info.dli_fbase;
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//printf ("linenum ip: %p\n", ip);
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//printf ("%s: 0x%x\n", info.dli_fname, offset);
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//offset -= sizeof(void *);
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// The unwinder gives us the return address. In order to get the right
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// line number for the stack trace, roll it back a little.
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offset -= 1;
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// printf ("%s: 0x%x\n", info.dli_fname, offset);
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finder->lookup (binaryName, (jlong) offset);
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*sourceFileName = finder->getSourceFile();
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*lineNum = finder->getLineNum();
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}
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#endif
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}
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// Look up class and method info for the given stack frame, setting
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// frame->klass and frame->meth if they are known.
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void
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_Jv_StackTrace::FillInFrameInfo (_Jv_StackFrame *frame)
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{
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jclass klass = NULL;
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_Jv_Method *meth = NULL;
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if (frame->type == frame_native)
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{
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klass = _Jv_StackTrace::ClassForFrame (frame);
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if (klass != NULL)
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// Find method in class
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for (int j = 0; j < klass->method_count; j++)
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{
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if (klass->methods[j].ncode == frame->start_ip)
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{
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meth = &klass->methods[j];
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break;
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}
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}
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}
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#ifdef INTERPRETER
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else if (frame->type == frame_interpreter)
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{
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_Jv_InterpMethod *interp_meth = frame->interp.meth;
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klass = interp_meth->defining_class;
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meth = interp_meth->self;
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}
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#endif
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else
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JvFail ("Unknown frame type");
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frame->klass = klass;
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frame->meth = meth;
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}
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// Convert raw stack frames to a Java array of StackTraceElement objects.
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JArray< ::java::lang::StackTraceElement *>*
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_Jv_StackTrace::GetStackTraceElements (_Jv_StackTrace *trace,
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Throwable *throwable __attribute__((unused)))
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{
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ArrayList *list = new ArrayList ();
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#ifdef SJLJ_EXCEPTIONS
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// We can't use the nCodeMap without unwinder support. Instead,
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// fake the method name by giving the IP in hex - better than nothing.
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jstring hex = JvNewStringUTF ("0x");
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for (int i = 0; i < trace->length; i++)
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{
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jstring sourceFileName = NULL;
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jint lineNum = -1;
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_Jv_StackFrame *frame = &trace->frames[i];
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jstring className = NULL;
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jstring methodName = hex->concat (Long::toHexString ((jlong) frame->ip));
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288 |
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289 |
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StackTraceElement *element = new StackTraceElement (sourceFileName,
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lineNum, className, methodName, 0);
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list->add (element);
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}
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#else /* SJLJ_EXCEPTIONS */
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295 |
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//JvSynchronized (ncodeMap);
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UpdateNCodeMap ();
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298 |
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299 |
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NameFinder *finder = new NameFinder();
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300 |
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int start_idx = 0;
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301 |
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int end_idx = trace->length - 1;
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302 |
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// First pass: strip superfluous frames from beginning and end of the trace.
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304 |
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for (int i = 0; i < trace->length; i++)
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305 |
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{
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306 |
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_Jv_StackFrame *frame = &trace->frames[i];
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307 |
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FillInFrameInfo (frame);
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308 |
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309 |
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if (!frame->klass || !frame->meth)
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310 |
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// Not a Java frame.
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311 |
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continue;
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312 |
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313 |
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// Throw away the top of the stack till we see:
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314 |
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// - the constructor(s) of this Throwable, or
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315 |
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// - the Throwable.fillInStackTrace call.
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316 |
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if (frame->klass == throwable->getClass()
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317 |
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&& strcmp (frame->meth->name->chars(), "<init>") == 0)
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318 |
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start_idx = i + 1;
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319 |
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320 |
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if (frame->klass == &Throwable::class$
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&& strcmp (frame->meth->name->chars(), "fillInStackTrace") == 0)
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322 |
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start_idx = i + 1;
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323 |
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324 |
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// End the trace at the application's main() method if we see call_main.
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325 |
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if (frame->klass == &gnu::java::lang::MainThread::class$
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326 |
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&& strcmp (frame->meth->name->chars(), "call_main") == 0)
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end_idx = i - 1;
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328 |
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}
|
329 |
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330 |
|
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const jboolean remove_unknown
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= gnu::gcj::runtime::NameFinder::removeUnknown();
|
332 |
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|
333 |
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// Second pass: Look up line-number info for remaining frames.
|
334 |
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for (int i = start_idx; i <= end_idx; i++)
|
335 |
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{
|
336 |
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_Jv_StackFrame *frame = &trace->frames[i];
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337 |
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338 |
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if (frame->klass == NULL && remove_unknown)
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339 |
|
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// Not a Java frame.
|
340 |
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continue;
|
341 |
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342 |
|
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jstring className = NULL;
|
343 |
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if (frame->klass != NULL)
|
344 |
|
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className = frame->klass->getName ();
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345 |
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346 |
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jstring methodName = NULL;
|
347 |
|
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if (frame->meth)
|
348 |
|
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methodName = JvNewStringUTF (frame->meth->name->chars());
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349 |
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350 |
|
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jstring sourceFileName = NULL;
|
351 |
|
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jint lineNum = -1;
|
352 |
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353 |
|
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getLineNumberForFrame(frame, finder, &sourceFileName, &lineNum,
|
354 |
|
|
&methodName);
|
355 |
|
|
|
356 |
|
|
StackTraceElement *element = new StackTraceElement (sourceFileName, lineNum,
|
357 |
|
|
className, methodName, 0);
|
358 |
|
|
list->add (element);
|
359 |
|
|
}
|
360 |
|
|
|
361 |
|
|
finder->close();
|
362 |
|
|
#endif /* SJLJ_EXCEPTIONS */
|
363 |
|
|
|
364 |
|
|
JArray<Object *> *array = JvNewObjectArray (list->size (),
|
365 |
|
|
&StackTraceElement::class$, NULL);
|
366 |
|
|
|
367 |
|
|
return (JArray<StackTraceElement *>*) list->toArray (array);
|
368 |
|
|
}
|
369 |
|
|
|
370 |
|
|
struct CallingClassTraceData
|
371 |
|
|
{
|
372 |
|
|
jclass checkClass;
|
373 |
|
|
jclass foundClass;
|
374 |
|
|
_Jv_Method *foundMeth;
|
375 |
|
|
bool seen_checkClass;
|
376 |
|
|
};
|
377 |
|
|
|
378 |
|
|
_Unwind_Reason_Code
|
379 |
|
|
_Jv_StackTrace::calling_class_trace_fn (_Jv_UnwindState *state)
|
380 |
|
|
{
|
381 |
|
|
CallingClassTraceData *trace_data = (CallingClassTraceData *)
|
382 |
|
|
state->trace_data;
|
383 |
|
|
_Jv_StackFrame *frame = &state->frames[state->pos];
|
384 |
|
|
FillInFrameInfo (frame);
|
385 |
|
|
|
386 |
|
|
if (trace_data->seen_checkClass
|
387 |
|
|
&& frame->klass
|
388 |
|
|
&& frame->klass != trace_data->checkClass)
|
389 |
|
|
{
|
390 |
|
|
trace_data->foundClass = frame->klass;
|
391 |
|
|
trace_data->foundMeth = frame->meth;
|
392 |
|
|
return _URC_NORMAL_STOP;
|
393 |
|
|
}
|
394 |
|
|
|
395 |
|
|
if (frame->klass == trace_data->checkClass)
|
396 |
|
|
trace_data->seen_checkClass = true;
|
397 |
|
|
|
398 |
|
|
return _URC_NO_REASON;
|
399 |
|
|
}
|
400 |
|
|
|
401 |
|
|
// Find the class immediately above the given class on the call stack. Any
|
402 |
|
|
// intermediate non-Java
|
403 |
|
|
// frames are ignored. If the calling class could not be determined (eg because
|
404 |
|
|
// the unwinder is not supported on this platform), NULL is returned.
|
405 |
|
|
// This function is used to implement calling-classloader checks and reflection
|
406 |
|
|
// accessibility checks.
|
407 |
|
|
// CHECKCLASS is typically the class calling GetCallingClass. The first class
|
408 |
|
|
// above CHECKCLASS on the call stack will be returned.
|
409 |
|
|
jclass
|
410 |
|
|
_Jv_StackTrace::GetCallingClass (jclass checkClass)
|
411 |
|
|
{
|
412 |
|
|
jclass result = NULL;
|
413 |
|
|
GetCallerInfo (checkClass, &result, NULL);
|
414 |
|
|
return result;
|
415 |
|
|
}
|
416 |
|
|
|
417 |
|
|
void
|
418 |
|
|
_Jv_StackTrace::GetCallerInfo (jclass checkClass, jclass *caller_class,
|
419 |
|
|
_Jv_Method **caller_meth)
|
420 |
|
|
{
|
421 |
|
|
#ifndef SJLJ_EXCEPTIONS
|
422 |
|
|
int trace_size = 20;
|
423 |
|
|
_Jv_StackFrame frames[trace_size];
|
424 |
|
|
_Jv_UnwindState state (trace_size);
|
425 |
|
|
state.frames = (_Jv_StackFrame *) &frames;
|
426 |
|
|
|
427 |
|
|
CallingClassTraceData trace_data;
|
428 |
|
|
trace_data.checkClass = checkClass;
|
429 |
|
|
trace_data.seen_checkClass = false;
|
430 |
|
|
trace_data.foundClass = NULL;
|
431 |
|
|
trace_data.foundMeth = NULL;
|
432 |
|
|
|
433 |
|
|
state.trace_function = calling_class_trace_fn;
|
434 |
|
|
state.trace_data = (void *) &trace_data;
|
435 |
|
|
|
436 |
|
|
//JvSynchronized (ncodeMap);
|
437 |
|
|
UpdateNCodeMap ();
|
438 |
|
|
|
439 |
|
|
_Unwind_Backtrace (UnwindTraceFn, &state);
|
440 |
|
|
|
441 |
|
|
if (caller_class)
|
442 |
|
|
*caller_class = trace_data.foundClass;
|
443 |
|
|
if (caller_meth)
|
444 |
|
|
*caller_meth = trace_data.foundMeth;
|
445 |
|
|
#else
|
446 |
|
|
return;
|
447 |
|
|
#endif
|
448 |
|
|
}
|
449 |
|
|
|
450 |
|
|
// Return a java array containing the Java classes on the stack above CHECKCLASS.
|
451 |
|
|
JArray<jclass> *
|
452 |
|
|
_Jv_StackTrace::GetClassContext (jclass checkClass)
|
453 |
|
|
{
|
454 |
|
|
JArray<jclass> *result = NULL;
|
455 |
|
|
|
456 |
|
|
int trace_size = 100;
|
457 |
|
|
_Jv_StackFrame frames[trace_size];
|
458 |
|
|
_Jv_UnwindState state (trace_size);
|
459 |
|
|
state.frames = (_Jv_StackFrame *) &frames;
|
460 |
|
|
|
461 |
|
|
//JvSynchronized (ncodeMap);
|
462 |
|
|
UpdateNCodeMap ();
|
463 |
|
|
|
464 |
|
|
_Unwind_Backtrace (UnwindTraceFn, &state);
|
465 |
|
|
|
466 |
|
|
// Count the number of Java frames on the stack.
|
467 |
|
|
int jframe_count = 0;
|
468 |
|
|
bool seen_checkClass = false;
|
469 |
|
|
int start_pos = -1;
|
470 |
|
|
for (int i = 0; i < state.pos; i++)
|
471 |
|
|
{
|
472 |
|
|
_Jv_StackFrame *frame = &state.frames[i];
|
473 |
|
|
FillInFrameInfo (frame);
|
474 |
|
|
|
475 |
|
|
if (seen_checkClass)
|
476 |
|
|
{
|
477 |
|
|
if (frame->klass)
|
478 |
|
|
{
|
479 |
|
|
jframe_count++;
|
480 |
|
|
if (start_pos == -1)
|
481 |
|
|
start_pos = i;
|
482 |
|
|
}
|
483 |
|
|
}
|
484 |
|
|
else
|
485 |
|
|
seen_checkClass = frame->klass == checkClass;
|
486 |
|
|
}
|
487 |
|
|
result = (JArray<jclass> *) _Jv_NewObjectArray (jframe_count, &Class::class$, NULL);
|
488 |
|
|
int pos = 0;
|
489 |
|
|
|
490 |
|
|
for (int i = start_pos; i < state.pos; i++)
|
491 |
|
|
{
|
492 |
|
|
_Jv_StackFrame *frame = &state.frames[i];
|
493 |
|
|
if (frame->klass)
|
494 |
|
|
elements(result)[pos++] = frame->klass;
|
495 |
|
|
}
|
496 |
|
|
return result;
|
497 |
|
|
}
|
498 |
|
|
|
499 |
|
|
_Unwind_Reason_Code
|
500 |
|
|
_Jv_StackTrace::non_system_trace_fn (_Jv_UnwindState *state)
|
501 |
|
|
{
|
502 |
|
|
_Jv_StackFrame *frame = &state->frames[state->pos];
|
503 |
|
|
FillInFrameInfo (frame);
|
504 |
|
|
|
505 |
|
|
ClassLoader *classLoader = NULL;
|
506 |
|
|
|
507 |
|
|
if (frame->klass)
|
508 |
|
|
{
|
509 |
|
|
classLoader = frame->klass->getClassLoaderInternal();
|
510 |
|
|
#ifdef INTERPRETER
|
511 |
|
|
if (classLoader != NULL)
|
512 |
|
|
{
|
513 |
|
|
state->trace_data = (void *) classLoader;
|
514 |
|
|
return _URC_NORMAL_STOP;
|
515 |
|
|
}
|
516 |
|
|
#endif
|
517 |
|
|
}
|
518 |
|
|
|
519 |
|
|
return _URC_NO_REASON;
|
520 |
|
|
}
|
521 |
|
|
|
522 |
|
|
ClassLoader *
|
523 |
|
|
_Jv_StackTrace::GetFirstNonSystemClassLoader ()
|
524 |
|
|
{
|
525 |
|
|
int trace_size = 32;
|
526 |
|
|
_Jv_StackFrame frames[trace_size];
|
527 |
|
|
_Jv_UnwindState state (trace_size);
|
528 |
|
|
state.frames = (_Jv_StackFrame *) &frames;
|
529 |
|
|
state.trace_function = non_system_trace_fn;
|
530 |
|
|
state.trace_data = NULL;
|
531 |
|
|
|
532 |
|
|
//JvSynchronized (ncodeMap);
|
533 |
|
|
UpdateNCodeMap ();
|
534 |
|
|
|
535 |
|
|
_Unwind_Backtrace (UnwindTraceFn, &state);
|
536 |
|
|
|
537 |
|
|
if (state.trace_data)
|
538 |
|
|
return (ClassLoader *) state.trace_data;
|
539 |
|
|
|
540 |
|
|
return NULL;
|
541 |
|
|
}
|