AIX: Disable backtrace API call

src/base/debug/stack_trace_posix.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Slightly adapted for inclusion in V8.
 // Copyright 2016 the V8 project authors. All rights reserved.
 
 #include "src/base/debug/stack_trace.h"
 
 #include <errno.h>
@@ skipping 117 matching lines @@
 void OutputPointer(void* pointer, BacktraceOutputHandler* handler) {
   // This should be more than enough to store a 64-bit number in hex:
   // 16 hex digits + 1 for null-terminator.
   char buf[17] = {'\0'};
   handler->HandleOutput("0x");
   internal::itoa_r(reinterpret_cast<intptr_t>(pointer), buf, sizeof(buf), 16,
                    12);
   handler->HandleOutput(buf);
 }
 
+#if !V8_OS_AIX
 void ProcessBacktrace(void* const* trace, size_t size,
                       BacktraceOutputHandler* handler) {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
   handler->HandleOutput("\n");
   handler->HandleOutput("==== C stack trace ===============================\n");
   handler->HandleOutput("\n");
 
   bool printed = false;
 
@@ skipping 16 matching lines @@
   }
 
   if (!printed) {
     for (size_t i = 0; i < size; ++i) {
       handler->HandleOutput(" [");
       OutputPointer(trace[i], handler);
       handler->HandleOutput("]\n");
     }
   }
 }
+#endif  // !V8_OS_AIX
 
 void PrintToStderr(const char* output) {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
   ssize_t return_val = write(STDERR_FILENO, output, strlen(output));
   USE(return_val);
 }
 
 void StackDumpSignalHandler(int signal, siginfo_t* info, void* void_context) {
   // NOTE: This code MUST be async-signal safe.
@@ skipping 168 matching lines @@
 }
 
 void DisableSignalStackDump() {
   dump_stack_in_signal_handler = false;
 }
 
 StackTrace::StackTrace() {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
 
+#if !V8_OS_AIX
   // Though the backtrace API man page does not list any possible negative
   // return values, we take no chance.
   count_ = static_cast<size_t>(backtrace(trace_, arraysize(trace_)));
+#else
+  count_ = 0;
+#endif
 }
 
 void StackTrace::Print() const {
   // NOTE: This code MUST be async-signal safe (it's used by in-process
   // stack dumping signal handler). NO malloc or stdio is allowed here.
 
+#if !V8_OS_AIX
   PrintBacktraceOutputHandler handler;
   ProcessBacktrace(trace_, count_, &handler);
+#endif
 }
 
+#if !V8_OS_AIX
 void StackTrace::OutputToStream(std::ostream* os) const {
   StreamBacktraceOutputHandler handler(os);
   ProcessBacktrace(trace_, count_, &handler);
 }
+#endif
 
 namespace internal {
 
 // NOTE: code from sandbox/linux/seccomp-bpf/demo.cc.
 char* itoa_r(intptr_t i, char* buf, size_t sz, int base, size_t padding) {
   // Make sure we can write at least one NUL byte.
   size_t n = 1;
   if (n > sz) return NULL;
 
   if (base < 2 || base > 16) {
@@ skipping 48 matching lines @@
     *start++ = ch;
   }
   return buf;
 }
 
 }  // namespace internal
 
 }  // namespace debug
 }  // namespace base
 }  // namespace v8