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Copy pathMetadata.cpp
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169 lines (149 loc) · 4.69 KB
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/*
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
#include "hermes/VM/Metadata.h"
namespace hermes {
namespace vm {
using std::size_t;
using std::uintptr_t;
using ArrayData = Metadata::ArrayData;
using ArrayType = ArrayData::ArrayType;
Metadata::Metadata(Builder &&mb)
: pointers_(mb.pointers_.size()),
values_(mb.values_.size()),
symbols_(mb.symbols_.size()),
array_(std::move(mb.array_)) {
auto copier =
[](const std::map<offset_t, std::pair<const char *, size_t>> &map,
Fields &insertionPoint) {
std::transform(
map.cbegin(),
map.cend(),
std::begin(insertionPoint.offsets),
[](const OffsetAndNameAndSize &p) { return p.first; });
std::transform(
map.cbegin(),
map.cend(),
std::begin(insertionPoint.names),
[](const OffsetAndNameAndSize &p) { return p.second.first; });
};
copier(mb.pointers_, pointers_);
copier(mb.values_, values_);
copier(mb.symbols_, symbols_);
}
Metadata::Metadata(Metadata &&that)
: pointers_(std::move(that.pointers_)),
values_(std::move(that.values_)),
symbols_(std::move(that.symbols_)),
array_(std::move(that.array_)) {}
Metadata::Builder::Builder(const void *base)
: base_(reinterpret_cast<const char *>(base)),
pointers_(),
values_(),
symbols_(),
array_() {}
void Metadata::Builder::addField(const GCPointerBase *fieldLocation) {
addField(nullptr, fieldLocation);
}
void Metadata::Builder::addField(
const char *name,
const GCPointerBase *fieldLocation) {
offset_t offset = reinterpret_cast<const char *>(fieldLocation) - base_;
size_t size = sizeof(GCPointerBase);
assert(!fieldConflicts(offset, size) && "fields should not overlap");
pointers_[offset] = std::make_pair(name, size);
}
void Metadata::Builder::addField(const GCHermesValue *fieldLocation) {
addField(nullptr, fieldLocation);
}
void Metadata::Builder::addField(
const char *name,
const GCHermesValue *fieldLocation) {
offset_t offset = reinterpret_cast<const char *>(fieldLocation) - base_;
size_t size = sizeof(GCHermesValue);
assert(!fieldConflicts(offset, size) && "fields should not overlap");
values_[offset] = std::make_pair(name, size);
}
void Metadata::Builder::addField(const SymbolID *fieldLocation) {
addField(nullptr, fieldLocation);
}
void Metadata::Builder::addField(
const char *name,
const SymbolID *fieldLocation) {
offset_t offset = reinterpret_cast<const char *>(fieldLocation) - base_;
size_t size = sizeof(SymbolID);
assert(!fieldConflicts(offset, size) && "fields should not overlap");
symbols_[offset] = std::make_pair(name, size);
}
Metadata Metadata::Builder::build() {
return Metadata(std::move(*this));
}
#ifndef NDEBUG
bool Metadata::Builder::fieldConflicts(offset_t offset, size_t size) {
size_t end = offset + size;
coveredOffsets_.resize(std::max(coveredOffsets_.size(), end));
for (offset_t i = offset; i < end; ++i) {
if (coveredOffsets_[i])
return true;
coveredOffsets_[i] = true;
}
return false;
}
#endif
/// @name Formatters
/// @{
llvh::raw_ostream &operator<<(llvh::raw_ostream &os, const Metadata &meta) {
os << "Metadata: {\n\tfieldsAndNames: [";
auto printOffsetAndNameAndSizes = [](llvh::raw_ostream &os,
const Metadata::Fields &vec) {
bool first = true;
for (size_t i = 0; i < vec.size(); ++i) {
if (!first) {
os << ",";
} else {
first = false;
}
os << "\n\t\t";
os << "{ offset: " << vec.offsets[i] << ", name: " << vec.names[i] << "}";
}
if (!vec.empty()) {
os << "\n\t";
}
};
printOffsetAndNameAndSizes(os, meta.pointers_);
printOffsetAndNameAndSizes(os, meta.values_);
printOffsetAndNameAndSizes(os, meta.symbols_);
os << "]";
if (meta.array_) {
os << ",\n\tarray: " << *meta.array_ << ",\n";
} else {
os << "\n";
}
return os << "}";
}
llvh::raw_ostream &operator<<(llvh::raw_ostream &os, ArrayData array) {
return os << "ArrayData: {type: {" << array.type
<< "}, lengthOffset: " << array.lengthOffset
<< ", stride: " << array.stride << "}";
}
llvh::raw_ostream &operator<<(llvh::raw_ostream &os, ArrayType arraytype) {
os << "ArrayType: {";
switch (arraytype) {
case ArrayType::Pointer:
os << "Pointer";
break;
case ArrayType::HermesValue:
os << "HermesValue";
break;
case ArrayType::Symbol:
os << "Symbol";
break;
}
return os << "}";
}
/// @}
} // namespace vm
} // namespace hermes