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// 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/machine-type.h"
namespace v8 {
namespace internal {
namespace compiler {
#define FOREACH_CTYPE_MACHINE_TYPE_MAPPING(V) \
V(void, MachineType::None()) \
V(bool, MachineType::Uint8()) \
V(int8_t, MachineType::Int8()) \
V(uint8_t, MachineType::Uint8()) \
V(int16_t, MachineType::Int16()) \
V(uint16_t, MachineType::Uint16()) \
V(int32_t, MachineType::Int32()) \
V(uint32_t, MachineType::Uint32()) \
V(int64_t, MachineType::Int64()) \
V(uint64_t, MachineType::Uint64()) \
V(float, MachineType::Float32()) \
V(double, MachineType::Float64()) \
V(void*, MachineType::Pointer()) \
V(int*, MachineType::Pointer())
template <typename T>
inline constexpr MachineType MachineTypeForC() {
static_assert(std::is_convertible<T, Object*>::value,
"all non-specialized types must be convertible to Object*");
return MachineType::AnyTagged();
}
#define DECLARE_TEMPLATE_SPECIALIZATION(ctype, mtype) \
template <> \
inline MachineType constexpr MachineTypeForC<ctype>() { \
return mtype; \
}
FOREACH_CTYPE_MACHINE_TYPE_MAPPING(DECLARE_TEMPLATE_SPECIALIZATION)
#undef DECLARE_TEMPLATE_SPECIALIZATION
// Helper for building machine signatures from C types.
class CSignature : public MachineSignature {
protected:
CSignature(size_t return_count, size_t parameter_count, MachineType* reps)
: MachineSignature(return_count, parameter_count, reps) {}
public:
template <typename... Params>
static void VerifyParams(MachineSignature* sig) {
// Verifies the C signature against the machine types.
std::array<MachineType, sizeof...(Params)> params{
{MachineTypeForC<Params>()...}};
for (size_t p = 0; p < params.size(); ++p) {
CHECK_EQ(sig->GetParam(p), params[p]);
}
}
static CSignature* FromMachine(Zone* zone, MachineSignature* msig) {
return reinterpret_cast<CSignature*>(msig);
}
template <typename... ParamMachineTypes>
static CSignature* New(Zone* zone, MachineType ret,
ParamMachineTypes... params) {
constexpr size_t param_count = sizeof...(params);
std::array<MachineType, param_count> param_arr{{params...}};
const size_t buffer_size =
param_count + (ret == MachineType::None() ? 0 : 1);
MachineType* buffer = zone->NewArray<MachineType>(buffer_size);
size_t pos = 0;
size_t return_count = 0;
if (ret != MachineType::None()) {
buffer[pos++] = ret;
return_count++;
}
for (MachineType p : param_arr) {
// Check that there are no MachineType::None()'s in the parameters.
CHECK_NE(MachineType::None(), p);
buffer[pos++] = p;
}
DCHECK_EQ(buffer_size, pos);
return new (zone) CSignature(return_count, param_count, buffer);
}
};
// Helper classes for instantiating Signature objects to be callable from C.
template <typename Ret, typename... Params>
class CSignatureOf : public CSignature {
public:
CSignatureOf() : CSignature(kReturnCount, kParamCount, storage_) {
constexpr std::array<MachineType, kParamCount> param_types{
MachineTypeForC<Params>()...};
if (kReturnCount == 1) storage_[0] = MachineTypeForC<Ret>();
static_assert(
std::is_same<decltype(*reps_), decltype(*param_types.data())>::value,
"type mismatch, cannot memcpy");
memcpy(storage_ + kReturnCount, param_types.data(),
sizeof(*storage_) * kParamCount);
}
private:
static constexpr size_t kReturnCount =
MachineTypeForC<Ret>() == MachineType::None() ? 0 : 1;
static constexpr size_t kParamCount = sizeof...(Params);
MachineType storage_[kReturnCount + kParamCount];
};
typedef CSignatureOf<int32_t, int32_t, int32_t> CSignature_i_ii;
typedef CSignatureOf<uint32_t, uint32_t, uint32_t> CSignature_u_uu;
typedef CSignatureOf<float, float, float> CSignature_f_ff;
typedef CSignatureOf<double, double, double> CSignature_d_dd;
typedef CSignatureOf<Object*, Object*, Object*> CSignature_o_oo;
} // namespace compiler
} // namespace internal
} // namespace v8
#endif // V8_COMPILER_C_SIGNATURE_H_
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