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     14 //       from this software without specific prior written permission.
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     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 #include "test/cctest/trace-extension.h"
     29 
     30 #include "src/profiler/tick-sample.h"
     31 #include "src/vm-state-inl.h"
     32 #include "test/cctest/cctest.h"
     33 
     34 namespace v8 {
     35 namespace internal {
     36 
     37 const char* TraceExtension::kSource =
     38     "native function trace();"
     39     "native function js_trace();"
     40     "native function js_entry_sp();"
     41     "native function js_entry_sp_level2();";
     42 
     43 
     44 v8::Local<v8::FunctionTemplate> TraceExtension::GetNativeFunctionTemplate(
     45     v8::Isolate* isolate, v8::Local<v8::String> name) {
     46   v8::Local<v8::Context> context = isolate->GetCurrentContext();
     47   if (name->Equals(context, v8::String::NewFromUtf8(isolate, "trace",
     48                                                     v8::NewStringType::kNormal)
     49                                 .ToLocalChecked())
     50           .FromJust()) {
     51     return v8::FunctionTemplate::New(isolate, TraceExtension::Trace);
     52   } else if (name->Equals(context,
     53                           v8::String::NewFromUtf8(isolate, "js_trace",
     54                                                   v8::NewStringType::kNormal)
     55                               .ToLocalChecked())
     56                  .FromJust()) {
     57     return v8::FunctionTemplate::New(isolate, TraceExtension::JSTrace);
     58   } else if (name->Equals(context,
     59                           v8::String::NewFromUtf8(isolate, "js_entry_sp",
     60                                                   v8::NewStringType::kNormal)
     61                               .ToLocalChecked())
     62                  .FromJust()) {
     63     return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySP);
     64   } else if (name->Equals(context,
     65                           v8::String::NewFromUtf8(isolate, "js_entry_sp_level2",
     66                                                   v8::NewStringType::kNormal)
     67                               .ToLocalChecked())
     68                  .FromJust()) {
     69     return v8::FunctionTemplate::New(isolate, TraceExtension::JSEntrySPLevel2);
     70   } else {
     71     CHECK(false);
     72     return v8::Local<v8::FunctionTemplate>();
     73   }
     74 }
     75 
     76 
     77 Address TraceExtension::GetFP(const v8::FunctionCallbackInfo<v8::Value>& args) {
     78   // Convert frame pointer from encoding as smis in the arguments to a pointer.
     79   CHECK_EQ(2, args.Length());  // Ignore second argument on 32-bit platform.
     80 #if defined(V8_HOST_ARCH_32_BIT)
     81   Address fp = *reinterpret_cast<Address*>(*args[0]);
     82 #elif defined(V8_HOST_ARCH_64_BIT)
     83   int64_t low_bits = *reinterpret_cast<uint64_t*>(*args[0]) >> 32;
     84   int64_t high_bits = *reinterpret_cast<uint64_t*>(*args[1]);
     85   Address fp = reinterpret_cast<Address>(high_bits | low_bits);
     86 #else
     87 #error Host architecture is neither 32-bit nor 64-bit.
     88 #endif
     89   printf("Trace: %p\n", static_cast<void*>(fp));
     90   return fp;
     91 }
     92 
     93 
     94 static struct {
     95   TickSample* sample;
     96 } trace_env = { NULL };
     97 
     98 
     99 void TraceExtension::InitTraceEnv(TickSample* sample) {
    100   trace_env.sample = sample;
    101 }
    102 
    103 
    104 void TraceExtension::DoTrace(Address fp) {
    105   RegisterState regs;
    106   regs.fp = fp;
    107   // sp is only used to define stack high bound
    108   regs.sp =
    109       reinterpret_cast<Address>(trace_env.sample) - 10240;
    110   trace_env.sample->Init(CcTest::i_isolate(), regs,
    111                          TickSample::kSkipCEntryFrame, true);
    112 }
    113 
    114 
    115 void TraceExtension::Trace(const v8::FunctionCallbackInfo<v8::Value>& args) {
    116   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
    117   i::VMState<EXTERNAL> state(isolate);
    118   Address address = reinterpret_cast<Address>(
    119       reinterpret_cast<intptr_t>(&TraceExtension::Trace));
    120   i::ExternalCallbackScope call_scope(isolate, address);
    121   DoTrace(GetFP(args));
    122 }
    123 
    124 
    125 // Hide c_entry_fp to emulate situation when sampling is done while
    126 // pure JS code is being executed
    127 static void DoTraceHideCEntryFPAddress(Address fp) {
    128   v8::internal::Address saved_c_frame_fp =
    129       *(CcTest::i_isolate()->c_entry_fp_address());
    130   CHECK(saved_c_frame_fp);
    131   *(CcTest::i_isolate()->c_entry_fp_address()) = 0;
    132   i::TraceExtension::DoTrace(fp);
    133   *(CcTest::i_isolate()->c_entry_fp_address()) = saved_c_frame_fp;
    134 }
    135 
    136 
    137 void TraceExtension::JSTrace(const v8::FunctionCallbackInfo<v8::Value>& args) {
    138   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(args.GetIsolate());
    139   i::VMState<EXTERNAL> state(isolate);
    140   Address address = reinterpret_cast<Address>(
    141       reinterpret_cast<intptr_t>(&TraceExtension::JSTrace));
    142   i::ExternalCallbackScope call_scope(isolate, address);
    143   DoTraceHideCEntryFPAddress(GetFP(args));
    144 }
    145 
    146 
    147 Address TraceExtension::GetJsEntrySp() {
    148   CHECK(CcTest::i_isolate()->thread_local_top());
    149   return CcTest::i_isolate()->js_entry_sp();
    150 }
    151 
    152 
    153 void TraceExtension::JSEntrySP(
    154     const v8::FunctionCallbackInfo<v8::Value>& args) {
    155   CHECK(GetJsEntrySp());
    156 }
    157 
    158 
    159 void TraceExtension::JSEntrySPLevel2(
    160     const v8::FunctionCallbackInfo<v8::Value>& args) {
    161   v8::HandleScope scope(args.GetIsolate());
    162   const Address js_entry_sp = GetJsEntrySp();
    163   CHECK(js_entry_sp);
    164   CompileRun("js_entry_sp();");
    165   CHECK_EQ(js_entry_sp, GetJsEntrySp());
    166 }
    167 
    168 
    169 }  // namespace internal
    170 }  // namespace v8
    171