Revision: 19993
Author: [email protected]
Date: Mon Mar 17 13:33:19 2014 UTC
Log: Expose DumpBacktrace for debugging purposes.
After this change, you can just call DumpBacktrace in any function.
Previously
the only function printing stack traces was V8_Fatal, but that also
terminated
the program, so not very useful for debugging.
Note that DumpBacktrace is roughly equivalent to base::debug::StackTrace
functionality in Chromium, except less fancy, but it's enough for us.
[email protected]
BUG=
Review URL: https://codereview.chromium.org/200343003
http://code.google.com/p/v8/source/detail?r=19993
Modified:
/branches/bleeding_edge/src/checks.cc
/branches/bleeding_edge/src/checks.h
=======================================
--- /branches/bleeding_edge/src/checks.cc Tue Jan 14 09:37:45 2014 UTC
+++ /branches/bleeding_edge/src/checks.cc Mon Mar 17 13:33:19 2014 UTC
@@ -38,30 +38,34 @@
#include "platform.h"
#include "v8.h"
+namespace v8 {
+namespace internal {
+
+intptr_t HeapObjectTagMask() { return kHeapObjectTagMask; }
// Attempts to dump a backtrace (if supported).
-static V8_INLINE void DumpBacktrace() {
+void DumpBacktrace() {
#if V8_LIBC_GLIBC || V8_OS_BSD
void* trace[100];
int size = backtrace(trace, ARRAY_SIZE(trace));
char** symbols = backtrace_symbols(trace, size);
- i::OS::PrintError("\n==== C stack trace
===============================\n\n");
+ OS::PrintError("\n==== C stack trace
===============================\n\n");
if (size == 0) {
- i::OS::PrintError("(empty)\n");
+ OS::PrintError("(empty)\n");
} else if (symbols == NULL) {
- i::OS::PrintError("(no symbols)\n");
+ OS::PrintError("(no symbols)\n");
} else {
for (int i = 1; i < size; ++i) {
- i::OS::PrintError("%2d: ", i);
+ OS::PrintError("%2d: ", i);
char mangled[201];
if (sscanf(symbols[i], "%*[^(]%*[(]%200[^)+]", mangled) == 1) { //
NOLINT
int status;
size_t length;
char* demangled = abi::__cxa_demangle(mangled, NULL, &length,
&status);
- i::OS::PrintError("%s\n", demangled != NULL ? demangled : mangled);
+ OS::PrintError("%s\n", demangled != NULL ? demangled : mangled);
free(demangled);
} else {
- i::OS::PrintError("??\n");
+ OS::PrintError("??\n");
}
}
}
@@ -73,21 +77,23 @@
bt_init_accessor(&acc, BT_SELF);
bt_load_memmap(&acc, &memmap);
bt_sprn_memmap(&memmap, out, sizeof(out));
- i::OS::PrintError(out);
+ OS::PrintError(out);
bt_addr_t trace[100];
int size = bt_get_backtrace(&acc, trace, ARRAY_SIZE(trace));
- i::OS::PrintError("\n==== C stack trace
===============================\n\n");
+ OS::PrintError("\n==== C stack trace
===============================\n\n");
if (size == 0) {
- i::OS::PrintError("(empty)\n");
+ OS::PrintError("(empty)\n");
} else {
bt_sprnf_addrs(&memmap, trace, size, const_cast<char*>("%a\n"),
out, sizeof(out), NULL);
- i::OS::PrintError(out);
+ OS::PrintError(out);
}
bt_unload_memmap(&memmap);
bt_release_accessor(&acc);
#endif // V8_LIBC_GLIBC || V8_OS_BSD
}
+
+} } // namespace v8::internal
// Contains protection against recursive calls (faults while handling
faults).
@@ -102,7 +108,7 @@
i::OS::VPrintError(format, arguments);
va_end(arguments);
i::OS::PrintError("\n#\n");
- DumpBacktrace();
+ v8::internal::DumpBacktrace();
fflush(stderr);
i::OS::Abort();
}
@@ -136,10 +142,3 @@
unexpected_source, value_source, *value_str);
}
}
-
-
-namespace v8 { namespace internal {
-
- intptr_t HeapObjectTagMask() { return kHeapObjectTagMask; }
-
-} } // namespace v8::internal
=======================================
--- /branches/bleeding_edge/src/checks.h Wed Feb 12 13:27:13 2014 UTC
+++ /branches/bleeding_edge/src/checks.h Mon Mar 17 13:33:19 2014 UTC
@@ -306,8 +306,12 @@
#define SLOW_ASSERT(condition) ((void) 0)
const bool FLAG_enable_slow_asserts = false;
#endif
-} // namespace internal
-} // namespace v8
+
+// Exposed for making debugging easier (to see where your function is being
+// called, just add a call to DumpBacktrace).
+void DumpBacktrace();
+
+} } // namespace v8::internal
// The ASSERT macro is equivalent to CHECK except that it only
--
--
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