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      1 // Copyright 2014 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "src/compiler/linkage.h"
      6 
      7 #include "src/code-stubs.h"
      8 #include "src/compiler.h"
      9 #include "src/compiler/node.h"
     10 #include "src/compiler/pipeline.h"
     11 #include "src/scopes.h"
     12 
     13 namespace v8 {
     14 namespace internal {
     15 namespace compiler {
     16 
     17 
     18 OStream& operator<<(OStream& os, const CallDescriptor::Kind& k) {
     19   switch (k) {
     20     case CallDescriptor::kCallCodeObject:
     21       os << "Code";
     22       break;
     23     case CallDescriptor::kCallJSFunction:
     24       os << "JS";
     25       break;
     26     case CallDescriptor::kCallAddress:
     27       os << "Addr";
     28       break;
     29   }
     30   return os;
     31 }
     32 
     33 
     34 OStream& operator<<(OStream& os, const CallDescriptor& d) {
     35   // TODO(svenpanne) Output properties etc. and be less cryptic.
     36   return os << d.kind() << ":" << d.debug_name() << ":r" << d.ReturnCount()
     37             << "j" << d.JSParameterCount() << "i" << d.InputCount() << "f"
     38             << d.FrameStateCount();
     39 }
     40 
     41 
     42 Linkage::Linkage(CompilationInfo* info) : info_(info) {
     43   if (info->function() != NULL) {
     44     // If we already have the function literal, use the number of parameters
     45     // plus the receiver.
     46     incoming_ = GetJSCallDescriptor(1 + info->function()->parameter_count());
     47   } else if (!info->closure().is_null()) {
     48     // If we are compiling a JS function, use a JS call descriptor,
     49     // plus the receiver.
     50     SharedFunctionInfo* shared = info->closure()->shared();
     51     incoming_ = GetJSCallDescriptor(1 + shared->formal_parameter_count());
     52   } else if (info->code_stub() != NULL) {
     53     // Use the code stub interface descriptor.
     54     CallInterfaceDescriptor descriptor =
     55         info->code_stub()->GetCallInterfaceDescriptor();
     56     incoming_ = GetStubCallDescriptor(descriptor);
     57   } else {
     58     incoming_ = NULL;  // TODO(titzer): ?
     59   }
     60 }
     61 
     62 
     63 FrameOffset Linkage::GetFrameOffset(int spill_slot, Frame* frame, int extra) {
     64   if (frame->GetSpillSlotCount() > 0 || incoming_->IsJSFunctionCall() ||
     65       incoming_->kind() == CallDescriptor::kCallAddress) {
     66     int offset;
     67     int register_save_area_size = frame->GetRegisterSaveAreaSize();
     68     if (spill_slot >= 0) {
     69       // Local or spill slot. Skip the frame pointer, function, and
     70       // context in the fixed part of the frame.
     71       offset =
     72           -(spill_slot + 1) * kPointerSize - register_save_area_size + extra;
     73     } else {
     74       // Incoming parameter. Skip the return address.
     75       offset = -(spill_slot + 1) * kPointerSize + kFPOnStackSize +
     76                kPCOnStackSize + extra;
     77     }
     78     return FrameOffset::FromFramePointer(offset);
     79   } else {
     80     // No frame. Retrieve all parameters relative to stack pointer.
     81     DCHECK(spill_slot < 0);  // Must be a parameter.
     82     int register_save_area_size = frame->GetRegisterSaveAreaSize();
     83     int offset = register_save_area_size - (spill_slot + 1) * kPointerSize +
     84                  kPCOnStackSize + extra;
     85     return FrameOffset::FromStackPointer(offset);
     86   }
     87 }
     88 
     89 
     90 CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count) {
     91   return GetJSCallDescriptor(parameter_count, this->info_->zone());
     92 }
     93 
     94 
     95 CallDescriptor* Linkage::GetRuntimeCallDescriptor(
     96     Runtime::FunctionId function, int parameter_count,
     97     Operator::Properties properties) {
     98   return GetRuntimeCallDescriptor(function, parameter_count, properties,
     99                                   this->info_->zone());
    100 }
    101 
    102 
    103 CallDescriptor* Linkage::GetStubCallDescriptor(
    104     CallInterfaceDescriptor descriptor, int stack_parameter_count,
    105     CallDescriptor::Flags flags) {
    106   return GetStubCallDescriptor(descriptor, stack_parameter_count, flags,
    107                                this->info_->zone());
    108 }
    109 
    110 
    111 // static
    112 bool Linkage::NeedsFrameState(Runtime::FunctionId function) {
    113   if (!FLAG_turbo_deoptimization) {
    114     return false;
    115   }
    116   // TODO(jarin) At the moment, we only add frame state for
    117   // few chosen runtime functions.
    118   switch (function) {
    119     case Runtime::kDebugBreak:
    120     case Runtime::kDebugGetLoadedScripts:
    121     case Runtime::kDeoptimizeFunction:
    122     case Runtime::kInlineCallFunction:
    123     case Runtime::kPrepareStep:
    124     case Runtime::kSetScriptBreakPoint:
    125     case Runtime::kStackGuard:
    126     case Runtime::kCheckExecutionState:
    127     case Runtime::kDebugEvaluate:
    128     case Runtime::kCollectStackTrace:
    129       return true;
    130     default:
    131       return false;
    132   }
    133 }
    134 
    135 
    136 //==============================================================================
    137 // Provide unimplemented methods on unsupported architectures, to at least link.
    138 //==============================================================================
    139 #if !V8_TURBOFAN_BACKEND
    140 CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count, Zone* zone) {
    141   UNIMPLEMENTED();
    142   return NULL;
    143 }
    144 
    145 
    146 CallDescriptor* Linkage::GetRuntimeCallDescriptor(
    147     Runtime::FunctionId function, int parameter_count,
    148     Operator::Properties properties, Zone* zone) {
    149   UNIMPLEMENTED();
    150   return NULL;
    151 }
    152 
    153 
    154 CallDescriptor* Linkage::GetStubCallDescriptor(
    155     CallInterfaceDescriptor descriptor, int stack_parameter_count,
    156     CallDescriptor::Flags flags, Zone* zone) {
    157   UNIMPLEMENTED();
    158   return NULL;
    159 }
    160 
    161 
    162 CallDescriptor* Linkage::GetSimplifiedCDescriptor(Zone* zone,
    163                                                   MachineSignature* sig) {
    164   UNIMPLEMENTED();
    165   return NULL;
    166 }
    167 #endif  // !V8_TURBOFAN_BACKEND
    168 }
    169 }
    170 }  // namespace v8::internal::compiler
    171