V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
c-linkage.cc
1 // Copyright 2015 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/assembler-inl.h"
6 #include "src/macro-assembler.h"
7 
8 #include "src/compiler/linkage.h"
9 
10 #include "src/zone/zone.h"
11 
12 namespace v8 {
13 namespace internal {
14 namespace compiler {
15 
16 namespace {
17 
18 // Platform-specific configuration for C calling convention.
19 #if V8_TARGET_ARCH_IA32
20 // ===========================================================================
21 // == ia32 ===================================================================
22 // ===========================================================================
23 #define CALLEE_SAVE_REGISTERS esi.bit() | edi.bit() | ebx.bit()
24 
25 #elif V8_TARGET_ARCH_X64
26 // ===========================================================================
27 // == x64 ====================================================================
28 // ===========================================================================
29 
30 #ifdef _WIN64
31 // == x64 windows ============================================================
32 #define STACK_SHADOW_WORDS 4
33 #define PARAM_REGISTERS rcx, rdx, r8, r9
34 #define CALLEE_SAVE_REGISTERS \
35  rbx.bit() | rdi.bit() | rsi.bit() | r12.bit() | r13.bit() | r14.bit() | \
36  r15.bit()
37 #define CALLEE_SAVE_FP_REGISTERS \
38  (1 << xmm6.code()) | (1 << xmm7.code()) | (1 << xmm8.code()) | \
39  (1 << xmm9.code()) | (1 << xmm10.code()) | (1 << xmm11.code()) | \
40  (1 << xmm12.code()) | (1 << xmm13.code()) | (1 << xmm14.code()) | \
41  (1 << xmm15.code())
42 #else
43 // == x64 other ==============================================================
44 #define PARAM_REGISTERS rdi, rsi, rdx, rcx, r8, r9
45 #define CALLEE_SAVE_REGISTERS \
46  rbx.bit() | r12.bit() | r13.bit() | r14.bit() | r15.bit()
47 #endif
48 
49 #elif V8_TARGET_ARCH_ARM
50 // ===========================================================================
51 // == arm ====================================================================
52 // ===========================================================================
53 #define PARAM_REGISTERS r0, r1, r2, r3
54 #define CALLEE_SAVE_REGISTERS \
55  r4.bit() | r5.bit() | r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit()
56 #define CALLEE_SAVE_FP_REGISTERS \
57  (1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) | \
58  (1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
59  (1 << d14.code()) | (1 << d15.code())
60 
61 
62 #elif V8_TARGET_ARCH_ARM64
63 // ===========================================================================
64 // == arm64 ====================================================================
65 // ===========================================================================
66 #define PARAM_REGISTERS x0, x1, x2, x3, x4, x5, x6, x7
67 #define CALLEE_SAVE_REGISTERS \
68  (1 << x19.code()) | (1 << x20.code()) | (1 << x21.code()) | \
69  (1 << x22.code()) | (1 << x23.code()) | (1 << x24.code()) | \
70  (1 << x25.code()) | (1 << x26.code()) | (1 << x27.code()) | \
71  (1 << x28.code()) | (1 << x29.code()) | (1 << x30.code())
72 
73 
74 #define CALLEE_SAVE_FP_REGISTERS \
75  (1 << d8.code()) | (1 << d9.code()) | (1 << d10.code()) | \
76  (1 << d11.code()) | (1 << d12.code()) | (1 << d13.code()) | \
77  (1 << d14.code()) | (1 << d15.code())
78 
79 #elif V8_TARGET_ARCH_MIPS
80 // ===========================================================================
81 // == mips ===================================================================
82 // ===========================================================================
83 #define STACK_SHADOW_WORDS 4
84 #define PARAM_REGISTERS a0, a1, a2, a3
85 #define CALLEE_SAVE_REGISTERS \
86  s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
87  s7.bit()
88 #define CALLEE_SAVE_FP_REGISTERS \
89  f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
90 
91 #elif V8_TARGET_ARCH_MIPS64
92 // ===========================================================================
93 // == mips64 =================================================================
94 // ===========================================================================
95 #define PARAM_REGISTERS a0, a1, a2, a3, a4, a5, a6, a7
96 #define CALLEE_SAVE_REGISTERS \
97  s0.bit() | s1.bit() | s2.bit() | s3.bit() | s4.bit() | s5.bit() | s6.bit() | \
98  s7.bit()
99 #define CALLEE_SAVE_FP_REGISTERS \
100  f20.bit() | f22.bit() | f24.bit() | f26.bit() | f28.bit() | f30.bit()
101 
102 #elif V8_TARGET_ARCH_PPC64
103 // ===========================================================================
104 // == ppc & ppc64 ============================================================
105 // ===========================================================================
106 #ifdef V8_TARGET_LITTLE_ENDIAN // ppc64le linux
107 #define STACK_SHADOW_WORDS 12
108 #else // AIX
109 #define STACK_SHADOW_WORDS 14
110 #endif
111 #define PARAM_REGISTERS r3, r4, r5, r6, r7, r8, r9, r10
112 #define CALLEE_SAVE_REGISTERS \
113  r14.bit() | r15.bit() | r16.bit() | r17.bit() | r18.bit() | r19.bit() | \
114  r20.bit() | r21.bit() | r22.bit() | r23.bit() | r24.bit() | r25.bit() | \
115  r26.bit() | r27.bit() | r28.bit() | r29.bit() | r30.bit()
116 #define CALLEE_SAVE_FP_REGISTERS \
117  d14.bit() | d15.bit() | d16.bit() | d17.bit() | d18.bit() | d19.bit() | \
118  d20.bit() | d21.bit() | d22.bit() | d23.bit() | d24.bit() | d25.bit() | \
119  d26.bit() | d27.bit() | d28.bit() | d29.bit() | d30.bit() | d31.bit()
120 
121 #elif V8_TARGET_ARCH_S390X
122 // ===========================================================================
123 // == s390x ==================================================================
124 // ===========================================================================
125 #define STACK_SHADOW_WORDS 20
126 #define PARAM_REGISTERS r2, r3, r4, r5, r6
127 #define CALLEE_SAVE_REGISTERS \
128  r6.bit() | r7.bit() | r8.bit() | r9.bit() | r10.bit() | ip.bit() | r13.bit()
129 #define CALLEE_SAVE_FP_REGISTERS \
130  d8.bit() | d9.bit() | d10.bit() | d11.bit() | d12.bit() | d13.bit() | \
131  d14.bit() | d15.bit()
132 
133 #else
134 // ===========================================================================
135 // == unknown ================================================================
136 // ===========================================================================
137 #define UNSUPPORTED_C_LINKAGE 1
138 #endif
139 } // namespace
140 
141 
142 // General code uses the above configuration data.
143 CallDescriptor* Linkage::GetSimplifiedCDescriptor(
144  Zone* zone, const MachineSignature* msig, bool set_initialize_root_flag) {
145  DCHECK_LE(msig->parameter_count(), static_cast<size_t>(kMaxCParameters));
146 
147  LocationSignature::Builder locations(zone, msig->return_count(),
148  msig->parameter_count());
149  // Check the types of the signature.
150  // Currently no floating point parameters or returns are allowed because
151  // on ia32, the FP top of stack is involved.
152  for (size_t i = 0; i < msig->return_count(); i++) {
153  MachineRepresentation rep = msig->GetReturn(i).representation();
154  CHECK_NE(MachineRepresentation::kFloat32, rep);
155  CHECK_NE(MachineRepresentation::kFloat64, rep);
156  }
157  for (size_t i = 0; i < msig->parameter_count(); i++) {
158  MachineRepresentation rep = msig->GetParam(i).representation();
159  CHECK_NE(MachineRepresentation::kFloat32, rep);
160  CHECK_NE(MachineRepresentation::kFloat64, rep);
161  }
162 
163 #ifdef UNSUPPORTED_C_LINKAGE
164  // This method should not be called on unknown architectures.
165  FATAL("requested C call descriptor on unsupported architecture");
166  return nullptr;
167 #endif
168 
169  // Add return location(s).
170  CHECK_GE(2, locations.return_count_);
171 
172  if (locations.return_count_ > 0) {
173  locations.AddReturn(LinkageLocation::ForRegister(kReturnRegister0.code(),
174  msig->GetReturn(0)));
175  }
176  if (locations.return_count_ > 1) {
177  locations.AddReturn(LinkageLocation::ForRegister(kReturnRegister1.code(),
178  msig->GetReturn(1)));
179  }
180 
181  const int parameter_count = static_cast<int>(msig->parameter_count());
182 
183 #ifdef PARAM_REGISTERS
184  const v8::internal::Register kParamRegisters[] = {PARAM_REGISTERS};
185  const int kParamRegisterCount = static_cast<int>(arraysize(kParamRegisters));
186 #else
187  const v8::internal::Register* kParamRegisters = nullptr;
188  const int kParamRegisterCount = 0;
189 #endif
190 
191 #ifdef STACK_SHADOW_WORDS
192  int stack_offset = STACK_SHADOW_WORDS;
193 #else
194  int stack_offset = 0;
195 #endif
196  // Add register and/or stack parameter(s).
197  for (int i = 0; i < parameter_count; i++) {
198  if (i < kParamRegisterCount) {
199  locations.AddParam(LinkageLocation::ForRegister(kParamRegisters[i].code(),
200  msig->GetParam(i)));
201  } else {
202  locations.AddParam(LinkageLocation::ForCallerFrameSlot(
203  -1 - stack_offset, msig->GetParam(i)));
204  stack_offset++;
205  }
206  }
207 
208 #ifdef CALLEE_SAVE_REGISTERS
209  const RegList kCalleeSaveRegisters = CALLEE_SAVE_REGISTERS;
210 #else
211  const RegList kCalleeSaveRegisters = 0;
212 #endif
213 
214 #ifdef CALLEE_SAVE_FP_REGISTERS
215  const RegList kCalleeSaveFPRegisters = CALLEE_SAVE_FP_REGISTERS;
216 #else
217  const RegList kCalleeSaveFPRegisters = 0;
218 #endif
219 
220  // The target for C calls is always an address (i.e. machine pointer).
221  MachineType target_type = MachineType::Pointer();
222  LinkageLocation target_loc = LinkageLocation::ForAnyRegister(target_type);
223  CallDescriptor::Flags flags = CallDescriptor::kNoFlags;
224  if (set_initialize_root_flag) {
225  flags |= CallDescriptor::kInitializeRootRegister;
226  }
227 
228  return new (zone) CallDescriptor( // --
229  CallDescriptor::kCallAddress, // kind
230  target_type, // target MachineType
231  target_loc, // target location
232  locations.Build(), // location_sig
233  0, // stack_parameter_count
234  Operator::kNoThrow, // properties
235  kCalleeSaveRegisters, // callee-saved registers
236  kCalleeSaveFPRegisters, // callee-saved fp regs
237  flags, "c-call");
238 }
239 
240 } // namespace compiler
241 } // namespace internal
242 } // namespace v8
v8
Definition: libplatform.h:13