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2e1ee891b8
Summary: There are a few instructions that all map to the same opcode, so when disassembling, we have to pick one. That was just the first one before (the except_ref variant in the case of "call"), now it is the one marked as IsCanonical in tablegen, or failing that, the shortest name (which is typically the "canonical" one). Also introduced a canonical "end" instruction for this purpose. Reviewers: dschuff, tlively Subscribers: sbc100, jgravelle-google, aheejin, llvm-commits, sunfish Tags: #llvm Differential Revision: https://reviews.llvm.org/D57713 llvm-svn: 353131
67 lines
2.9 KiB
TableGen
67 lines
2.9 KiB
TableGen
//=- WebAssemblyInstrFormats.td - WebAssembly Instr. Formats -*- tablegen -*-=//
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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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/// WebAssembly instruction format definitions.
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///
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//===----------------------------------------------------------------------===//
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// WebAssembly Instruction Format.
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// We instantiate 2 of these for every actual instruction (register based
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// and stack based), see below.
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class WebAssemblyInst<bits<32> inst, string asmstr, string stack> : StackRel,
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Instruction {
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bits<32> Inst = inst; // Instruction encoding.
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string StackBased = stack;
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string BaseName = NAME;
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let Namespace = "WebAssembly";
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let Pattern = [];
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let AsmString = asmstr;
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// When there are multiple instructions that map to the same encoding (in
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// e.g. the disassembler use case) prefer the one where IsCanonical == 1.
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bit IsCanonical = 0;
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}
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// Normal instructions. Default instantiation of a WebAssemblyInst.
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class NI<dag oops, dag iops, list<dag> pattern, string stack,
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string asmstr = "", bits<32> inst = -1>
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: WebAssemblyInst<inst, asmstr, stack> {
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dag OutOperandList = oops;
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dag InOperandList = iops;
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let Pattern = pattern;
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let Defs = [ARGUMENTS];
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}
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// Generates both register and stack based versions of one actual instruction.
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// We have 2 sets of operands (oops & iops) for the register and stack
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// based version of this instruction, as well as the corresponding asmstr.
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// The register versions have virtual-register operands which correspond to wasm
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// locals or stack locations. Each use and def of the register corresponds to an
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// implicit local.get / local.set or access of stack operands in wasm. These
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// instructions are used for ISel and all MI passes. The stack versions of the
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// instructions do not have register operands (they implicitly operate on the
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// stack), and local.gets and local.sets are explicit. The register instructions
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// are converted to their corresponding stack instructions before lowering to
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// MC.
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// Every instruction should want to be based on this multi-class to guarantee
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// there is always an equivalent pair of instructions.
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multiclass I<dag oops_r, dag iops_r, dag oops_s, dag iops_s,
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list<dag> pattern_r, string asmstr_r = "", string asmstr_s = "",
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bits<32> inst = -1> {
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let isCodeGenOnly = 1 in
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def "" : NI<oops_r, iops_r, pattern_r, "false", asmstr_r, inst>;
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let BaseName = NAME in
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def _S : NI<oops_s, iops_s, [], "true", asmstr_s, inst>;
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}
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// For instructions that have no register ops, so both sets are the same.
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multiclass NRI<dag oops, dag iops, list<dag> pattern, string asmstr = "",
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bits<32> inst = -1> {
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defm "": I<oops, iops, oops, iops, pattern, asmstr, asmstr, inst>;
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}
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