118445841d
WebAssembly's `memory.fill` and `memory.copy` instructions trap if the pointers are out of bounds, even if the length is zero. This is different from LLVM, which expects that it can call `memcpy` on arbitrary invalid pointers if the length is zero. To avoid spurious traps, branch around `memory.fill` and `memory.copy` when the length is zero. --------- Co-authored-by: Heejin Ahn <aheejin@gmail.com>
62 lines
2.0 KiB
C++
62 lines
2.0 KiB
C++
//- WebAssemblyISD.def - WebAssembly ISD ---------------------------*- C++ -*-//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file describes the various WebAssembly ISD node types.
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///
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//===----------------------------------------------------------------------===//
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// NOTE: NO INCLUDE GUARD DESIRED!
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HANDLE_NODETYPE(CALL)
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HANDLE_NODETYPE(RET_CALL)
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HANDLE_NODETYPE(RETURN)
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HANDLE_NODETYPE(ARGUMENT)
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HANDLE_NODETYPE(LOCAL_GET)
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HANDLE_NODETYPE(LOCAL_SET)
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// A wrapper node for TargetExternalSymbol, TargetGlobalAddress, and MCSymbol
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HANDLE_NODETYPE(Wrapper)
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// A special node for TargetGlobalAddress used in PIC code for
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// __memory_base/__table_base relative access.
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HANDLE_NODETYPE(WrapperREL)
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HANDLE_NODETYPE(BR_IF)
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HANDLE_NODETYPE(BR_TABLE)
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HANDLE_NODETYPE(SHUFFLE)
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HANDLE_NODETYPE(SWIZZLE)
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HANDLE_NODETYPE(VEC_SHL)
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HANDLE_NODETYPE(VEC_SHR_S)
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HANDLE_NODETYPE(VEC_SHR_U)
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HANDLE_NODETYPE(NARROW_U)
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HANDLE_NODETYPE(EXTEND_LOW_S)
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HANDLE_NODETYPE(EXTEND_LOW_U)
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HANDLE_NODETYPE(EXTEND_HIGH_S)
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HANDLE_NODETYPE(EXTEND_HIGH_U)
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HANDLE_NODETYPE(CONVERT_LOW_S)
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HANDLE_NODETYPE(CONVERT_LOW_U)
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HANDLE_NODETYPE(PROMOTE_LOW)
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HANDLE_NODETYPE(TRUNC_SAT_ZERO_S)
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HANDLE_NODETYPE(TRUNC_SAT_ZERO_U)
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HANDLE_NODETYPE(DEMOTE_ZERO)
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HANDLE_NODETYPE(I64_ADD128)
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HANDLE_NODETYPE(I64_SUB128)
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HANDLE_NODETYPE(I64_MUL_WIDE_S)
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HANDLE_NODETYPE(I64_MUL_WIDE_U)
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// Memory intrinsics
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HANDLE_MEM_NODETYPE(GLOBAL_GET)
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HANDLE_MEM_NODETYPE(GLOBAL_SET)
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HANDLE_MEM_NODETYPE(TABLE_GET)
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HANDLE_MEM_NODETYPE(TABLE_SET)
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// Bulk memory instructions. These follow LLVM's expected semantics of
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// supporting out-of-bounds pointers if the length is zero, by inserting
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// a branch around Wasm's `memory.copy` and `memory.fill`, which would
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// otherwise trap.
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HANDLE_NODETYPE(MEMCPY)
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HANDLE_NODETYPE(MEMSET)
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