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Relationship maps are represented as InstrMapping records which are parsed by TableGen and the information is used to construct mapping tables to represent appropriate relations between instructions. These tables are emitted into XXXGenInstrInfo.inc file along with the functions to query them. Patch by Jyotsna Verma <jverma@codeaurora.org>. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166685 91177308-0d34-0410-b5e6-96231b3b80d8
80 lines
3.6 KiB
C++
80 lines
3.6 KiB
C++
//===- TableGenBackends.h - Declarations for LLVM TableGen Backends -------===//
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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 contains the declarations for all of the LLVM TableGen
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// backends. A "TableGen backend" is just a function. See below for a
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// precise description.
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//
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//===----------------------------------------------------------------------===//
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// A TableGen backend is a function that looks like
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//
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// EmitFoo(RecordKeeper &RK, raw_ostream &OS /*, anything else you need */ )
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//
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// What you do inside of that function is up to you, but it will usually
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// involve generating C++ code to the provided raw_ostream.
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//
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// The RecordKeeper is just a top-level container for an in-memory
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// representation of the data encoded in the TableGen file. What a TableGen
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// backend does is walk around that in-memory representation and generate
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// stuff based on the information it contains.
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//
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// The in-memory representation is a node-graph (think of it like JSON but
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// with a richer ontology of types), where the nodes are subclasses of
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// Record. The methods `getClass`, `getDef` are the basic interface to
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// access the node-graph. RecordKeeper also provides a handy method
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// `getAllDerivedDefinitions`. Consult "include/llvm/TableGen/Record.h" for
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// the exact interfaces provided by Record's and RecordKeeper.
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//
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// A common pattern for TableGen backends is for the EmitFoo function to
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// instantiate a class which holds some context for the generation process,
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// and then have most of the work happen in that class's methods. This
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// pattern partly has historical roots in the previous TableGen backend API
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// that involved a class and an invocation like `FooEmitter(RK).run(OS)`.
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//
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// Remember to wrap private things in an anonymous namespace. For most
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// backends, this means that the EmitFoo function is the only thing not in
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// the anonymous namespace.
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// FIXME: Reorganize TableGen so that build dependencies can be more
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// accurately expressed. Currently, touching any of the emitters (or
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// anything that they transitively depend on) causes everything dependent
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// on TableGen to be rebuilt (this includes all the targets!). Perhaps have
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// a standalone TableGen binary and have the backends be loadable modules
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// of some sort; then the dependency could be expressed as being on the
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// module, and all the modules would have a common dependency on the
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// TableGen binary with as few dependencies as possible on the rest of
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// LLVM.
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namespace llvm {
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class raw_ostream;
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class RecordKeeper;
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void EmitIntrinsics(RecordKeeper &RK, raw_ostream &OS, bool TargetOnly = false);
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void EmitAsmMatcher(RecordKeeper &RK, raw_ostream &OS);
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void EmitAsmWriter(RecordKeeper &RK, raw_ostream &OS);
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void EmitCallingConv(RecordKeeper &RK, raw_ostream &OS);
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void EmitCodeEmitter(RecordKeeper &RK, raw_ostream &OS);
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void EmitDAGISel(RecordKeeper &RK, raw_ostream &OS);
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void EmitDFAPacketizer(RecordKeeper &RK, raw_ostream &OS);
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void EmitDisassembler(RecordKeeper &RK, raw_ostream &OS);
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void EmitEnhancedDisassemblerInfo(RecordKeeper &RK, raw_ostream &OS);
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void EmitFastISel(RecordKeeper &RK, raw_ostream &OS);
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void EmitInstrInfo(RecordKeeper &RK, raw_ostream &OS);
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void EmitPseudoLowering(RecordKeeper &RK, raw_ostream &OS);
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void EmitRegisterInfo(RecordKeeper &RK, raw_ostream &OS);
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void EmitSubtarget(RecordKeeper &RK, raw_ostream &OS);
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void EmitMapTable(RecordKeeper &RK, raw_ostream &OS);
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} // End llvm namespace
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