4a1a6e288e
R=clemensh@chromium.org Change-Id: I49ca12fc882dd19eb26b60ed64a36b023a836702 Reviewed-on: https://chromium-review.googlesource.com/868294 Reviewed-by: Clemens Hammacher <clemensh@chromium.org> Commit-Queue: Michael Starzinger <mstarzinger@chromium.org> Cr-Commit-Position: refs/heads/master@{#50626}
124 lines
4.4 KiB
C++
124 lines
4.4 KiB
C++
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_COMPILER_C_SIGNATURE_H_
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#define V8_COMPILER_C_SIGNATURE_H_
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#include "src/machine-type.h"
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namespace v8 {
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namespace internal {
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namespace compiler {
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#define FOREACH_CTYPE_MACHINE_TYPE_MAPPING(V) \
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V(void, MachineType::None()) \
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V(bool, MachineType::Uint8()) \
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V(int8_t, MachineType::Int8()) \
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V(uint8_t, MachineType::Uint8()) \
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V(int16_t, MachineType::Int16()) \
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V(uint16_t, MachineType::Uint16()) \
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V(int32_t, MachineType::Int32()) \
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V(uint32_t, MachineType::Uint32()) \
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V(int64_t, MachineType::Int64()) \
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V(uint64_t, MachineType::Uint64()) \
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V(float, MachineType::Float32()) \
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V(double, MachineType::Float64()) \
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V(void*, MachineType::Pointer()) \
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V(int*, MachineType::Pointer())
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template <typename T>
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inline constexpr MachineType MachineTypeForC() {
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static_assert(std::is_convertible<T, Object*>::value,
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"all non-specialized types must be convertible to Object*");
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return MachineType::AnyTagged();
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}
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#define DECLARE_TEMPLATE_SPECIALIZATION(ctype, mtype) \
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template <> \
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inline MachineType constexpr MachineTypeForC<ctype>() { \
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return mtype; \
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}
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FOREACH_CTYPE_MACHINE_TYPE_MAPPING(DECLARE_TEMPLATE_SPECIALIZATION)
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#undef DECLARE_TEMPLATE_SPECIALIZATION
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// Helper for building machine signatures from C types.
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class CSignature : public MachineSignature {
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protected:
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CSignature(size_t return_count, size_t parameter_count, MachineType* reps)
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: MachineSignature(return_count, parameter_count, reps) {}
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public:
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template <typename... Params>
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static void VerifyParams(MachineSignature* sig) {
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// Verifies the C signature against the machine types.
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std::array<MachineType, sizeof...(Params)> params{
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{MachineTypeForC<Params>()...}};
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for (size_t p = 0; p < params.size(); ++p) {
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CHECK_EQ(sig->GetParam(p), params[p]);
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}
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}
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static CSignature* FromMachine(Zone* zone, MachineSignature* msig) {
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return reinterpret_cast<CSignature*>(msig);
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}
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template <typename... ParamMachineTypes>
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static CSignature* New(Zone* zone, MachineType ret,
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ParamMachineTypes... params) {
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constexpr size_t param_count = sizeof...(params);
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std::array<MachineType, param_count> param_arr{{params...}};
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const size_t buffer_size =
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param_count + (ret == MachineType::None() ? 0 : 1);
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MachineType* buffer = zone->NewArray<MachineType>(buffer_size);
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size_t pos = 0;
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size_t return_count = 0;
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if (ret != MachineType::None()) {
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buffer[pos++] = ret;
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return_count++;
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}
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for (MachineType p : param_arr) {
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// Check that there are no MachineType::None()'s in the parameters.
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CHECK_NE(MachineType::None(), p);
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buffer[pos++] = p;
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}
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DCHECK_EQ(buffer_size, pos);
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return new (zone) CSignature(return_count, param_count, buffer);
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}
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};
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// Helper classes for instantiating Signature objects to be callable from C.
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template <typename Ret, typename... Params>
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class CSignatureOf : public CSignature {
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public:
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CSignatureOf() : CSignature(kReturnCount, kParamCount, storage_) {
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constexpr std::array<MachineType, kParamCount> param_types{
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MachineTypeForC<Params>()...};
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if (kReturnCount == 1) storage_[0] = MachineTypeForC<Ret>();
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static_assert(
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std::is_same<decltype(*reps_), decltype(*param_types.data())>::value,
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"type mismatch, cannot memcpy");
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memcpy(storage_ + kReturnCount, param_types.data(),
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sizeof(*storage_) * kParamCount);
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}
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private:
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static constexpr size_t kReturnCount =
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MachineTypeForC<Ret>() == MachineType::None() ? 0 : 1;
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static constexpr size_t kParamCount = sizeof...(Params);
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MachineType storage_[kReturnCount + kParamCount];
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};
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typedef CSignatureOf<int32_t, int32_t, int32_t> CSignature_i_ii;
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typedef CSignatureOf<uint32_t, uint32_t, uint32_t> CSignature_u_uu;
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typedef CSignatureOf<float, float, float> CSignature_f_ff;
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typedef CSignatureOf<double, double, double> CSignature_d_dd;
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typedef CSignatureOf<Object*, Object*, Object*> CSignature_o_oo;
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} // namespace compiler
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} // namespace internal
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} // namespace v8
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#endif // V8_COMPILER_C_SIGNATURE_H_
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