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// Copyright 2021 The Tint Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "src/sem/struct.h"
#include <cmath>
#include <iomanip>
#include <string>
#include <utility>
#include "src/ast/struct_member.h"
#include "src/symbol_table.h"
TINT_INSTANTIATE_TYPEINFO(tint::sem::Struct);
TINT_INSTANTIATE_TYPEINFO(tint::sem::StructMember);
namespace tint {
namespace sem {
Struct::Struct(const ast::Struct* declaration,
Symbol name,
StructMemberList members,
uint32_t align,
uint32_t size,
uint32_t size_no_padding)
: declaration_(declaration),
name_(name),
members_(std::move(members)),
align_(align),
size_(size),
size_no_padding_(size_no_padding) {
constructible_ = true;
for (auto* member : members_) {
if (!member->Type()->IsConstructible()) {
constructible_ = false;
break;
}
}
}
Struct::~Struct() = default;
const StructMember* Struct::FindMember(Symbol name) const {
for (auto* member : members_) {
if (member->Declaration()->symbol == name) {
return member;
}
}
return nullptr;
}
std::string Struct::type_name() const {
return "__struct_" + name_.to_str();
}
uint32_t Struct::Align() const {
return align_;
}
uint32_t Struct::Size() const {
return size_;
}
std::string Struct::FriendlyName(const SymbolTable& symbols) const {
return symbols.NameFor(name_);
}
std::string Struct::Layout(const tint::SymbolTable& symbols) const {
std::stringstream ss;
auto member_name_of = [&](const sem::StructMember* sm) {
return symbols.NameFor(sm->Declaration()->symbol);
};
if (Members().empty()) {
return {};
}
const auto* const last_member = Members().back();
const uint32_t last_member_struct_padding_offset =
last_member->Offset() + last_member->Size();
// Compute max widths to align output
const auto offset_w =
static_cast<int>(::log10(last_member_struct_padding_offset)) + 1;
const auto size_w = static_cast<int>(::log10(Size())) + 1;
const auto align_w = static_cast<int>(::log10(Align())) + 1;
auto print_struct_begin_line = [&](size_t align, size_t size,
std::string struct_name) {
ss << "/* " << std::setw(offset_w) << " "
<< "align(" << std::setw(align_w) << align << ") size("
<< std::setw(size_w) << size << ") */ struct " << struct_name << " {\n";
};
auto print_struct_end_line = [&]() {
ss << "/* "
<< std::setw(offset_w + size_w + align_w) << " "
<< "*/ };";
};
auto print_member_line = [&](size_t offset, size_t align, size_t size,
std::string s) {
ss << "/* offset(" << std::setw(offset_w) << offset << ") align("
<< std::setw(align_w) << align << ") size(" << std::setw(size_w) << size
<< ") */ " << s << ";\n";
};
print_struct_begin_line(Align(), Size(), UnwrapRef()->FriendlyName(symbols));
for (size_t i = 0; i < Members().size(); ++i) {
auto* const m = Members()[i];
// Output field alignment padding, if any
auto* const prev_member = (i == 0) ? nullptr : Members()[i - 1];
if (prev_member) {
uint32_t padding =
m->Offset() - (prev_member->Offset() + prev_member->Size());
if (padding > 0) {
size_t padding_offset = m->Offset() - padding;
print_member_line(padding_offset, 1, padding,
"// -- implicit field alignment padding --");
}
}
// Output member
std::string member_name = member_name_of(m);
print_member_line(
m->Offset(), m->Align(), m->Size(),
member_name + " : " + m->Type()->UnwrapRef()->FriendlyName(symbols));
}
// Output struct size padding, if any
uint32_t struct_padding = Size() - last_member_struct_padding_offset;
if (struct_padding > 0) {
print_member_line(last_member_struct_padding_offset, 1, struct_padding,
"// -- implicit struct size padding --");
}
print_struct_end_line();
return ss.str();
}
bool Struct::IsConstructible() const {
return constructible_;
}
StructMember::StructMember(const ast::StructMember* declaration,
Symbol name,
sem::Type* type,
uint32_t index,
uint32_t offset,
uint32_t align,
uint32_t size)
: declaration_(declaration),
name_(name),
type_(type),
index_(index),
offset_(offset),
align_(align),
size_(size) {}
StructMember::~StructMember() = default;
} // namespace sem
} // namespace tint