Add MachineSignature, which is an encapsulation of the machine types for parameters and return valu…

test/cctest/compiler/c-signature.h

+// Copyright 2014 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.
+
+#ifndef V8_COMPILER_C_SIGNATURE_H_
+#define V8_COMPILER_C_SIGNATURE_H_
+
+#include "src/compiler/machine-type.h"
+
+namespace v8 {
+namespace internal {
+namespace compiler {
+
+template <typename T>
+inline MachineType MachineTypeForC() {
+  CHECK(false);  // Instantiated with invalid type.
+  return kMachNone;
+}
+
+template <>
+inline MachineType MachineTypeForC<void>() {
+  return kMachNone;
+}
+
+template <>
+inline MachineType MachineTypeForC<int8_t>() {
+  return kMachInt8;
+}
+
+template <>
+inline MachineType MachineTypeForC<uint8_t>() {
+  return kMachUint8;
+}
+
+template <>
+inline MachineType MachineTypeForC<int16_t>() {
+  return kMachInt16;
+}
+
+template <>
+inline MachineType MachineTypeForC<uint16_t>() {
+  return kMachUint16;
+}
+
+template <>
+inline MachineType MachineTypeForC<int32_t>() {
+  return kMachInt32;
+}
+
+template <>
+inline MachineType MachineTypeForC<uint32_t>() {
+  return kMachUint32;
+}
+
+template <>
+inline MachineType MachineTypeForC<int64_t>() {
+  return kMachInt64;
+}
+
+template <>
+inline MachineType MachineTypeForC<uint64_t>() {
+  return kMachUint64;
+}
+
+template <>
+inline MachineType MachineTypeForC<double>() {
+  return kMachFloat64;
+}
+
+template <>
+inline MachineType MachineTypeForC<Object*>() {
+  return kMachAnyTagged;
+}
+
+template <typename Ret, uint16_t kParamCount>
+class CSignatureOf : public MachineSignature {
+ protected:
+  MachineType storage_[1 + kParamCount];
+
+  CSignatureOf()
+      : MachineSignature(MachineTypeForC<Ret>() != kMachNone ? 1 : 0,
+                         kParamCount,
+                         reinterpret_cast<MachineType*>(&storage_)) {
+    if (return_count_ == 1) storage_[0] = MachineTypeForC<Ret>();
+  }
+  void Set(int index, MachineType type) {
+    DCHECK(index >= 0 && index < kParamCount);
+    reps_[return_count_ + index] = type;
+  }
+};
+
+// Helper classes for instantiating Signature objects to be callable from C.
+template <typename Ret>
+class CSignature0 : public CSignatureOf<Ret, 0> {
+ public:
+  CSignature0() : CSignatureOf<Ret, 0>() {}
+};
+
+template <typename Ret, typename P1>
+class CSignature1 : public CSignatureOf<Ret, 1> {
+ public:
+  CSignature1() : CSignatureOf<Ret, 1>() {
+    this->Set(0, MachineTypeForC<P1>());
+  }
+};
+
+template <typename Ret, typename P1, typename P2>
+class CSignature2 : public CSignatureOf<Ret, 2> {
+ public:
+  CSignature2() : CSignatureOf<Ret, 2>() {
+    this->Set(0, MachineTypeForC<P1>());
+    this->Set(1, MachineTypeForC<P2>());
+  }
+};
+
+template <typename Ret, typename P1, typename P2, typename P3>
+class CSignature3 : public CSignatureOf<Ret, 3> {
+ public:
+  CSignature3() : CSignatureOf<Ret, 3>() {
+    this->Set(0, MachineTypeForC<P1>());
+    this->Set(1, MachineTypeForC<P2>());
+    this->Set(2, MachineTypeForC<P3>());
+  }
+};
+
+static const CSignature2<int32_t, int32_t, int32_t> int32_int32_to_int32;
+static const CSignature2<uint32_t, uint32_t, uint32_t> uint32_uint32_to_uint32;
+static const CSignature2<double, double, double> float64_float64_to_float64;
+}
+}
+}  // namespace v8::internal::compiler
+
+#endif  // V8_COMPILER_C_SIGNATURE_H_