LLVM 17.0.0git
InstructionNamer.cpp
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1//===- InstructionNamer.cpp - Give anonymous instructions names -----------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This is a little utility pass that gives instructions names, this is mostly
10// useful when diffing the effect of an optimization because deleting an
11// unnamed instruction can change all other instruction numbering, making the
12// diff very noisy.
13//
14//===----------------------------------------------------------------------===//
15
17#include "llvm/IR/Function.h"
18#include "llvm/IR/PassManager.h"
19#include "llvm/IR/Type.h"
21#include "llvm/Pass.h"
23
24using namespace llvm;
25
26namespace {
27void nameInstructions(Function &F) {
28 for (auto &Arg : F.args()) {
29 if (!Arg.hasName())
30 Arg.setName("arg");
31 }
32
33 for (BasicBlock &BB : F) {
34 if (!BB.hasName())
35 BB.setName("bb");
36
37 for (Instruction &I : BB) {
38 if (!I.hasName() && !I.getType()->isVoidTy())
39 I.setName("i");
40 }
41 }
42}
43
44struct InstNamer : public FunctionPass {
45 static char ID; // Pass identification, replacement for typeid
46 InstNamer() : FunctionPass(ID) {
48 }
49
50 void getAnalysisUsage(AnalysisUsage &Info) const override {
51 Info.setPreservesAll();
52 }
53
54 bool runOnFunction(Function &F) override {
55 nameInstructions(F);
56 return true;
57 }
58};
59
60 char InstNamer::ID = 0;
61 } // namespace
62
63INITIALIZE_PASS(InstNamer, "instnamer",
64 "Assign names to anonymous instructions", false, false)
65char &llvm::InstructionNamerID = InstNamer::ID;
66//===----------------------------------------------------------------------===//
67//
68// InstructionNamer - Give any unnamed non-void instructions "tmp" names.
69//
71 return new InstNamer();
72}
73
76 nameInstructions(F);
78}
amdgpu Simplify well known AMD library false FunctionCallee Value * Arg
Analysis containing CSE Info
Definition: CSEInfo.cpp:27
#define F(x, y, z)
Definition: MD5.cpp:55
#define I(x, y, z)
Definition: MD5.cpp:58
FunctionAnalysisManager FAM
This header defines various interfaces for pass management in LLVM.
#define INITIALIZE_PASS(passName, arg, name, cfg, analysis)
Definition: PassSupport.h:38
A container for analyses that lazily runs them and caches their results.
Definition: PassManager.h:620
Represent the analysis usage information of a pass.
LLVM Basic Block Representation.
Definition: BasicBlock.h:56
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:308
virtual bool runOnFunction(Function &F)=0
runOnFunction - Virtual method overriden by subclasses to do the per-function processing of the pass.
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
virtual void getAnalysisUsage(AnalysisUsage &) const
getAnalysisUsage - This function should be overriden by passes that need analysis information to do t...
Definition: Pass.cpp:98
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:152
static PreservedAnalyses all()
Construct a special preserved set that preserves all passes.
Definition: PassManager.h:158
unsigned ID
LLVM IR allows to use arbitrary numbers as calling convention identifiers.
Definition: CallingConv.h:24
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
char & InstructionNamerID
void initializeInstNamerPass(PassRegistry &)
FunctionPass * createInstructionNamerPass()
PreservedAnalyses run(Function &, FunctionAnalysisManager &)