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
13namespace v8 {
14namespace internal {
15namespace compiler {
16
17
18OStream& 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
34OStream& 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
42Linkage::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
63FrameOffset 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
90CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count) {
91  return GetJSCallDescriptor(parameter_count, this->info_->zone());
92}
93
94
95CallDescriptor* 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
103CallDescriptor* 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
112bool 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
140CallDescriptor* Linkage::GetJSCallDescriptor(int parameter_count, Zone* zone) {
141  UNIMPLEMENTED();
142  return NULL;
143}
144
145
146CallDescriptor* Linkage::GetRuntimeCallDescriptor(
147    Runtime::FunctionId function, int parameter_count,
148    Operator::Properties properties, Zone* zone) {
149  UNIMPLEMENTED();
150  return NULL;
151}
152
153
154CallDescriptor* Linkage::GetStubCallDescriptor(
155    CallInterfaceDescriptor descriptor, int stack_parameter_count,
156    CallDescriptor::Flags flags, Zone* zone) {
157  UNIMPLEMENTED();
158  return NULL;
159}
160
161
162CallDescriptor* 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