openbsd: fix platform build

src/sampler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 20 matching lines @@
     || defined(__NetBSD__) || defined(__sun) || defined(__ANDROID__) \
     || defined(__native_client__)
 
 #define USE_SIGNALS
 
 #include <errno.h>
 #include <pthread.h>
 #include <signal.h>
 #include <sys/time.h>
 #include <sys/syscall.h>
-#if !defined(__ANDROID__) || defined(__BIONIC_HAVE_UCONTEXT_T)
+// OpenBSD doesn't have <ucontext.h>. ucontext_t lives in <signal.h>
+// and is a typedef for struct sigcontext. There is no uc_mcontext.
+#if (!defined(__ANDROID__) || defined(__BIONIC_HAVE_UCONTEXT_T)) \
+    && !defined(__OpenBSD__)
 #include <ucontext.h>
 #endif
 #include <unistd.h>
 
 // GLibc on ARM defines mcontext_t has a typedef for 'struct sigcontext'.
 // Old versions of the C library <signal.h> didn't define the type.
 #if defined(__ANDROID__) && !defined(__BIONIC_HAVE_UCONTEXT_T) && \
     defined(__arm__) && !defined(__BIONIC_HAVE_STRUCT_SIGCONTEXT)
 #include <asm/sigcontext.h>
 #endif
@@ skipping 271 matching lines @@
 
   RegisterState state;
 
 #if defined(USE_SIMULATOR)
   SimulatorHelper helper;
   if (!helper.Init(sampler, isolate)) return;
   helper.FillRegisters(&state);
 #else
   // Extracting the sample from the context is extremely machine dependent.
   ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
+#if !defined(__OpenBSD__)
   mcontext_t& mcontext = ucontext->uc_mcontext;
+#endif
 #if defined(__linux__) || defined(__ANDROID__)
 #if V8_HOST_ARCH_IA32
   state.pc = reinterpret_cast<Address>(mcontext.gregs[REG_EIP]);
   state.sp = reinterpret_cast<Address>(mcontext.gregs[REG_ESP]);
   state.fp = reinterpret_cast<Address>(mcontext.gregs[REG_EBP]);
 #elif V8_HOST_ARCH_X64
   state.pc = reinterpret_cast<Address>(mcontext.gregs[REG_RIP]);
   state.sp = reinterpret_cast<Address>(mcontext.gregs[REG_RSP]);
   state.fp = reinterpret_cast<Address>(mcontext.gregs[REG_RBP]);
 #elif V8_HOST_ARCH_ARM
@@ skipping 33 matching lines @@
 #if V8_HOST_ARCH_IA32
   state.pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_EIP]);
   state.sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_ESP]);
   state.fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_EBP]);
 #elif V8_HOST_ARCH_X64
   state.pc = reinterpret_cast<Address>(mcontext.__gregs[_REG_RIP]);
   state.sp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RSP]);
   state.fp = reinterpret_cast<Address>(mcontext.__gregs[_REG_RBP]);
 #endif  // V8_HOST_ARCH_*
 #elif defined(__OpenBSD__)
-  USE(mcontext);
 #if V8_HOST_ARCH_IA32
   state.pc = reinterpret_cast<Address>(ucontext->sc_eip);
   state.sp = reinterpret_cast<Address>(ucontext->sc_esp);
   state.fp = reinterpret_cast<Address>(ucontext->sc_ebp);
 #elif V8_HOST_ARCH_X64
   state.pc = reinterpret_cast<Address>(ucontext->sc_rip);
   state.sp = reinterpret_cast<Address>(ucontext->sc_rsp);
   state.fp = reinterpret_cast<Address>(ucontext->sc_rbp);
 #endif  // V8_HOST_ARCH_*
 #elif defined(__sun)
@@ skipping 298 matching lines @@
   sample->Init(isolate_, state);
   if (is_counting_samples_) {
     if (sample->state == JS || sample->state == EXTERNAL) {
       ++js_and_external_sample_count_;
     }
   }
   Tick(sample);
 }
 
 } }  // namespace v8::internal