dawn-cmake/src/symbol_test.cc

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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/symbol.h"
#include "gtest/gtest.h"
namespace tint {
namespace {
using SymbolTest = testing::Test;
TEST_F(SymbolTest, ToStr) {
Symbol sym(1);
SymbolTable: Change behavior of anonymous symbols SymbolTable::New() used to build and return a symbol without a registered name. When you asked for the name of the symbol it would return tint_symbol_N, where N is the numerical identifier for the symbol. This approach was a major tripping hazzard for transforms that liked to fetch the source program name, and register it in the new program (in this situation, you should always use `CloneContext::Clone(Symbol)`). Without special casing for unnamed symbols, you could end up promoting the unnamed symbol to a named symbol, and then colliding against a new unnamed symbol. This is exactly what happened in tint:711. Instead, with this change: * The concept of unnamed symbols has been removed. All symbols now have a name. * The signature of `SymbolTable::New()` has been changed to take a name parameter (which defaults to 'tint_symbol'). This can be used to create a new, unique named symbol (possibly with a suffix), which will not collide with any existing symbols. Note these symbols may still collide if `SymbolTable::Register()` is called with the same name. All Transforms that currently use `SymbolTable::Register()` will be fixed in another change. * The CloneContext has been updated to use `SymbolTable::New()` instead of `Register()`. This means that any symbols defined before a clone will not collide. * `CloneContext::CloneSymbols()` has been added which allows a transform to pre-clone all the symbols from the source program. This can be used to avoid the authored identifiers being suffixed with a number, in the case a transform calls New() before the symbol is cloned. * `Symbol::to_str()` has been changed to return `$<id>` instead of `tint_symbol_N`. This is to avoid any confusion between the actual name and the symbol ID. Bug: tint:711 Bug: tint:712 Change-Id: I526e4b49b7027545613859de487e6a275686107a Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/47631 Commit-Queue: Ben Clayton <bclayton@google.com> Reviewed-by: Antonio Maiorano <amaiorano@google.com>
2021-04-13 20:07:57 +00:00
EXPECT_EQ("$1", sym.to_str());
}
TEST_F(SymbolTest, CopyAssign) {
Symbol sym1(1);
Symbol sym2;
EXPECT_FALSE(sym2.IsValid());
sym2 = sym1;
EXPECT_TRUE(sym2.IsValid());
EXPECT_EQ(sym2, sym1);
}
TEST_F(SymbolTest, Comparison) {
Symbol sym1(1);
Symbol sym2(2);
Symbol sym3(1);
EXPECT_TRUE(sym1 == sym3);
EXPECT_FALSE(sym1 == sym2);
EXPECT_FALSE(sym3 == sym2);
}
} // namespace
} // namespace tint