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Diffstat (limited to 'src/ast/global-utils.h')
-rw-r--r-- | src/ast/global-utils.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/src/ast/global-utils.h b/src/ast/global-utils.h new file mode 100644 index 000000000..f5bebe8aa --- /dev/null +++ b/src/ast/global-utils.h @@ -0,0 +1,55 @@ +/* + * Copyright 2017 WebAssembly Community Group participants + * + * 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. + */ + +#ifndef wasm_ast_global_h +#define wasm_ast_global_h + +#include <algorithm> +#include <vector> + +#include "literal.h" +#include "wasm.h" + +namespace wasm { + +namespace GlobalUtils { + // find a global initialized to the value of an import, or null if no such global + inline Global* getGlobalInitializedToImport(Module&wasm, Name module, Name base) { + // find the import + Name imported; + for (auto& import : wasm.imports) { + if (import->module == module && import->base == base) { + imported = import->name; + break; + } + } + if (imported.isNull()) return nullptr; + // find a global inited to it + for (auto& global : wasm.globals) { + if (auto* init = global->init->dynCast<GetGlobal>()) { + if (init->name == imported) { + return global.get(); + } + } + } + return nullptr; + } +}; + +} // namespace wasm + +#endif // wasm_ast_global_h + |