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86fa0255b2
The way the named arguments for various system instructions are handled at the
moment has a few problems:
- Large-scale duplication between AArch64BaseInfo.h and AArch64BaseInfo.cpp
- That weird Mapping class that I have no idea what I was on when I thought
it was a good idea.
- Searches are performed linearly through the entire list.
- We print absolutely all registers in upper-case, even though some are
canonically mixed case (SPSel for example).
- The ARM ARM specifies sysregs in terms of 5 fields, but those are relegated
to comments in our implementation, with a slightly opaque hex value
indicating the canonical encoding LLVM will use.
This adds a new TableGen backend to produce efficiently searchable tables, and
switches AArch64 over to using that infrastructure.
llvm-svn: 274576
42 lines
1.8 KiB
TableGen
42 lines
1.8 KiB
TableGen
//===- SearchableTable.td ----------------------------------*- tablegen -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file defines the key top-level classes needed to produce a reasonably
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// generic table that can be binary-searched via int and string entries.
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//
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// Each table must instantiate "Mappingkind", listing the fields that should be
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// included and fields that shoould be searchable. Only two kinds of fields are
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// searchable at the moment: "strings" (which are compared case-insensitively),
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// and "bits".
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//
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// For each "MappingKind" the generated header will create GET_MAPPINGKIND_DECL
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// and GET_MAPPINGKIND_IMPL guards.
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//
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// Inside the DECL guard will be a set of function declarations:
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// "lookup{InstanceClass}By{SearchableField}", returning "const {InstanceClass}
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// *" and accepting either a StringRef or a uintN_t. Additionally, if
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// EnumNameField is still defined, there will be an "enum {InstanceClass}Values"
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// allowing C++ code to reference either the primary data table's entries (if
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// EnumValueField is not defined) or some other field (e.g. encoding) if it is.
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//
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// Inside the IMPL guard will be a primary data table "{InstanceClass}sList" and
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// as many searchable indexes as requested
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// ("{InstanceClass}sBy{SearchableField}"). Additionally implementations of the
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// lookup function will be provided.
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//
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// See AArch64SystemOperands.td and its generated header for example uses.
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//
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//===----------------------------------------------------------------------===//
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class SearchableTable {
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list<string> SearchableFields;
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string EnumNameField = "Name";
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string EnumValueField;
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}
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