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// Copyright 2020 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/reader/spirv/namer.h"
#include <algorithm>
#include <sstream>
#include <unordered_set>
#include "src/debug.h"
namespace tint {
namespace reader {
namespace spirv {
namespace {
const char* kWGSLReservedWords[] = {
// Please keep this list sorted
"array", "as", "asm",
"bf16", "binding", "block",
"bool", "break", "builtin",
"case", "cast", "compute",
"const", "continue", "default",
"discard", "do", "else",
"elseif", "entry_point", "enum",
"f16", "f32", "fallthrough",
"false", "fn", "for",
"fragment", "i16", "i32",
"i64", "i8", "if",
"image", "import", "in",
"let", "location", "loop",
"mat2x2", "mat2x3", "mat2x4",
"mat3x2", "mat3x3", "mat3x4",
"mat4x2", "mat4x3", "mat4x4",
"offset", "out", "override",
"premerge", "private", "ptr",
"regardless", "return", "set",
"storage", "struct", "switch",
"true", "type", "typedef",
"u16", "u32", "u64",
"u8", "uniform", "uniform_constant",
"unless", "using", "var",
"vec2", "vec3", "vec4",
"vertex", "void", "while",
"workgroup",
};
} // namespace
Namer::Namer(const FailStream& fail_stream) : fail_stream_(fail_stream) {
for (const auto* reserved : kWGSLReservedWords) {
name_to_id_[std::string(reserved)] = 0;
}
}
Namer::~Namer() = default;
std::string Namer::Sanitize(const std::string& suggested_name) {
if (suggested_name.empty()) {
return "empty";
}
// Otherwise, replace invalid characters by '_'.
std::string result;
std::string invalid_as_first_char = "_0123456789";
std::string valid =
"abcdefghijklmnopqrstuvwxyz"
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"_0123456789";
// If the first character is invalid for starting a WGSL identifier, then
// prefix the result with "x".
if ((std::string::npos != invalid_as_first_char.find(suggested_name[0])) ||
(std::string::npos == valid.find(suggested_name[0]))) {
result = "x";
}
std::transform(suggested_name.begin(), suggested_name.end(),
std::back_inserter(result), [&valid](const char c) {
return (std::string::npos == valid.find(c)) ? '_' : c;
});
return result;
}
std::string Namer::GetMemberName(uint32_t struct_id,
uint32_t member_index) const {
std::string result;
auto where = struct_member_names_.find(struct_id);
if (where != struct_member_names_.end()) {
auto& member_names = where->second;
if (member_index < member_names.size()) {
result = member_names[member_index];
}
}
return result;
}
std::string Namer::FindUnusedDerivedName(const std::string& base_name) const {
// Ensure uniqueness among names.
std::string derived_name;
int i = 0;
do {
std::stringstream new_name_stream;
new_name_stream << base_name;
if (i > 0) {
new_name_stream << "_" << i;
}
i++;
derived_name = new_name_stream.str();
} while (IsRegistered(derived_name));
return derived_name;
}
std::string Namer::MakeDerivedName(const std::string& base_name) {
auto result = FindUnusedDerivedName(base_name);
const bool registered = RegisterWithoutId(result);
TINT_ASSERT(Reader, registered);
return result;
}
bool Namer::Register(uint32_t id, const std::string& name) {
if (HasName(id)) {
return Fail() << "internal error: ID " << id
<< " already has registered name: " << id_to_name_[id];
}
if (!RegisterWithoutId(name)) {
return false;
}
id_to_name_[id] = name;
name_to_id_[name] = id;
return true;
}
bool Namer::RegisterWithoutId(const std::string& name) {
if (IsRegistered(name)) {
return Fail() << "internal error: name already registered: " << name;
}
name_to_id_[name] = 0;
return true;
}
bool Namer::SuggestSanitizedName(uint32_t id,
const std::string& suggested_name) {
if (HasName(id)) {
return false;
}
return Register(id, FindUnusedDerivedName(Sanitize(suggested_name)));
}
bool Namer::SuggestSanitizedMemberName(uint32_t struct_id,
uint32_t member_index,
const std::string& suggested_name) {
// Creates an empty vector the first time we visit this struct.
auto& name_vector = struct_member_names_[struct_id];
// Resizing will set new entries to the empty string.
name_vector.resize(std::max(name_vector.size(), size_t(member_index + 1)));
auto& entry = name_vector[member_index];
if (entry.empty()) {
entry = Sanitize(suggested_name);
return true;
}
return false;
}
void Namer::ResolveMemberNamesForStruct(uint32_t struct_id,
uint32_t num_members) {
auto& name_vector = struct_member_names_[struct_id];
// Resizing will set new entries to the empty string.
// It would have been an error if the client had registered a name for
// an out-of-bounds member index, so toss those away.
name_vector.resize(num_members);
std::unordered_set<std::string> used_names;
// Returns a name, based on the suggestion, which does not equal
// any name in the used_names set.
auto disambiguate_name =
[&used_names](const std::string& suggestion) -> std::string {
if (used_names.find(suggestion) == used_names.end()) {
// There is no collision.
return suggestion;
}
uint32_t i = 1;
std::string new_name;
do {
std::stringstream new_name_stream;
new_name_stream << suggestion << "_" << i;
new_name = new_name_stream.str();
++i;
} while (used_names.find(new_name) != used_names.end());
return new_name;
};
// First ensure uniqueness among names for which we have already taken
// suggestions.
for (auto& name : name_vector) {
if (!name.empty()) {
// This modifies the names in-place, i.e. update the name_vector
// entries.
name = disambiguate_name(name);
used_names.insert(name);
}
}
// Now ensure uniqueness among the rest. Doing this in a second pass
// allows us to preserve suggestions as much as possible. Otherwise
// a generated name such as 'field1' might collide with a user-suggested
// name of 'field1' attached to a later member.
uint32_t index = 0;
for (auto& name : name_vector) {
if (name.empty()) {
std::stringstream suggestion;
suggestion << "field" << index;
// Again, modify the name-vector in-place.
name = disambiguate_name(suggestion.str());
used_names.insert(name);
}
index++;
}
}
} // namespace spirv
} // namespace reader
} // namespace tint