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This commit implements support for WebAssembly table types and respective builtins. Table tables are WebAssembly objects to store reference types. They have a large amount of semantic restrictions including, but not limited to, only being allowed to be declared at the top-level as static arrays of zero-length. Not being arguments or result of functions, not being stored ot memory, etc. This commit introduces the __attribute__((wasm_table)) to attach to arrays of WebAssembly reference types. And the following builtins to manage tables: * ref __builtin_wasm_table_get(table, idx) * void __builtin_wasm_table_set(table, idx, ref) * uint __builtin_wasm_table_size(table) * uint __builtin_wasm_table_grow(table, ref, uint) * void __builtin_wasm_table_fill(table, idx, ref, uint) * void __builtin_wasm_table_copy(table, table, uint, uint, uint) This commit also enables reference-types feature at bleeding-edge. This is joint work with Alex Bradbury (@asb). Reviewed By: aaron.ballman Differential Revision: https://reviews.llvm.org/D139010
31 lines
1.2 KiB
C++
31 lines
1.2 KiB
C++
// RUN: %clang_cc1 -std=c++11 -fcxx-exceptions -fexceptions -fsyntax-only -verify -triple wasm32 -Wno-unused-value -target-feature +reference-types %s
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// RUN: %clang_cc1 -std=c++20 -fcxx-exceptions -fexceptions -fsyntax-only -verify -triple wasm32 -Wno-unused-value -target-feature +reference-types %s
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//
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// Note: As WebAssembly references are sizeless types, we don't exhaustively
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// test for cases covered by sizeless-1.c and similar tests.
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// Using c++11 to test dynamic exception specifications (which are not
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// allowed in c++17).
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// Unlike standard sizeless types, reftype globals are supported.
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__externref_t r1;
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static __externref_t table[0];
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#if (_cplusplus == 201103L)
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__externref_t func(__externref_t ref) throw(__externref_t) { // expected-error {{WebAssembly reference type not allowed in exception specification}}
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return ref;
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}
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#endif
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void *ret_void_ptr() {
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throw table; // expected-error {{cannot throw a WebAssembly reference type}}
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throw r1; // expected-error {{cannot throw a WebAssembly reference type}}
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try {}
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catch (__externref_t T) { // expected-error {{cannot catch a WebAssembly reference type}}
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(void)0;
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}
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return table; // expected-error {{cannot return a WebAssembly table}}
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}
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