Contribution of PowerPC port.

src/sampler.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/sampler.h"
 
 #if V8_OS_POSIX && !V8_OS_CYGWIN
 
 #define USE_SIGNALS
 
@@ skipping 244 matching lines @@
     state->sp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::sp));
     state->fp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::fp));
 #elif V8_TARGET_ARCH_MIPS64
     state->pc = reinterpret_cast<Address>(simulator_->get_pc());
     state->sp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::sp));
     state->fp = reinterpret_cast<Address>(simulator_->get_register(
         Simulator::fp));
+#elif V8_TARGET_ARCH_PPC
+    state->pc = reinterpret_cast<Address>(simulator_->get_pc());
+    state->sp = reinterpret_cast<Address>(simulator_->get_register(
+        Simulator::sp));
+    state->fp = reinterpret_cast<Address>(simulator_->get_register(
+        Simulator::fp));
 #endif
   }
 
  private:
   Simulator* simulator_;
 };
 #endif  // USE_SIMULATOR
 
 
 #if defined(USE_SIGNALS)
@@ skipping 82 matching lines @@
   if (!helper.Init(sampler, isolate)) return;
   helper.FillRegisters(&state);
   // It possible that the simulator is interrupted while it is updating
   // the sp or fp register. ARM64 simulator does this in two steps:
   // first setting it to zero and then setting it to the new value.
   // Bailout if sp/fp doesn't contain the new value.
   if (state.sp == 0 || state.fp == 0) return;
 #else
   // Extracting the sample from the context is extremely machine dependent.
   ucontext_t* ucontext = reinterpret_cast<ucontext_t*>(context);
-#if !V8_OS_OPENBSD
+#if !(V8_OS_OPENBSD || (V8_OS_LINUX && V8_HOST_ARCH_PPC))
   mcontext_t& mcontext = ucontext->uc_mcontext;
 #endif
 #if V8_OS_LINUX
 #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]);
@@ skipping 18 matching lines @@
   // FP is an alias for x29.
   state.fp = reinterpret_cast<Address>(mcontext.regs[29]);
 #elif V8_HOST_ARCH_MIPS
   state.pc = reinterpret_cast<Address>(mcontext.pc);
   state.sp = reinterpret_cast<Address>(mcontext.gregs[29]);
   state.fp = reinterpret_cast<Address>(mcontext.gregs[30]);
 #elif V8_HOST_ARCH_MIPS64
   state.pc = reinterpret_cast<Address>(mcontext.pc);
   state.sp = reinterpret_cast<Address>(mcontext.gregs[29]);
   state.fp = reinterpret_cast<Address>(mcontext.gregs[30]);
+#elif V8_HOST_ARCH_PPC
+  state.pc = reinterpret_cast<Address>(ucontext->uc_mcontext.regs->nip);
+  state.sp = reinterpret_cast<Address>(ucontext->uc_mcontext.regs->gpr[PT_R1]);
+  state.fp = reinterpret_cast<Address>(ucontext->uc_mcontext.regs->gpr[PT_R31]);
 #endif  // V8_HOST_ARCH_*
 #elif V8_OS_MACOSX
 #if V8_HOST_ARCH_X64
 #if __DARWIN_UNIX03
   state.pc = reinterpret_cast<Address>(mcontext->__ss.__rip);
   state.sp = reinterpret_cast<Address>(mcontext->__ss.__rsp);
   state.fp = reinterpret_cast<Address>(mcontext->__ss.__rbp);
 #else  // !__DARWIN_UNIX03
   state.pc = reinterpret_cast<Address>(mcontext->ss.rip);
   state.sp = reinterpret_cast<Address>(mcontext->ss.rsp);
@@ skipping 322 matching lines @@
 #endif  // USE_SIMULATOR
     SampleStack(state);
   }
   ResumeThread(profiled_thread);
 }
 
 #endif  // USE_SIGNALS
 
 
 } }  // namespace v8::internal