-
Notifications
You must be signed in to change notification settings - Fork 387
/
HelloWorld.cpp
79 lines (72 loc) · 2.96 KB
/
HelloWorld.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
//=============================================================================
// FILE:
// HelloWorld.cpp
//
// DESCRIPTION:
// Visits all functions in a module, prints their names and the number of
// arguments via stderr. Strictly speaking, this is an analysis pass (i.e.
// the functions are not modified). However, in order to keep things simple
// there's no 'print' method here (every analysis pass should implement it).
//
// USAGE:
// New PM
// opt -load-pass-plugin=libHelloWorld.dylib -passes="hello-world" `\`
// -disable-output <input-llvm-file>
//
//
// License: MIT
//=============================================================================
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Passes/PassPlugin.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
//-----------------------------------------------------------------------------
// HelloWorld implementation
//-----------------------------------------------------------------------------
// No need to expose the internals of the pass to the outside world - keep
// everything in an anonymous namespace.
namespace {
// This method implements what the pass does
void visitor(Function &F) {
errs() << "(llvm-tutor) Hello from: "<< F.getName() << "\n";
errs() << "(llvm-tutor) number of arguments: " << F.arg_size() << "\n";
}
// New PM implementation
struct HelloWorld : PassInfoMixin<HelloWorld> {
// Main entry point, takes IR unit to run the pass on (&F) and the
// corresponding pass manager (to be queried if need be)
PreservedAnalyses run(Function &F, FunctionAnalysisManager &) {
visitor(F);
return PreservedAnalyses::all();
}
// Without isRequired returning true, this pass will be skipped for functions
// decorated with the optnone LLVM attribute. Note that clang -O0 decorates
// all functions with optnone.
static bool isRequired() { return true; }
};
} // namespace
//-----------------------------------------------------------------------------
// New PM Registration
//-----------------------------------------------------------------------------
llvm::PassPluginLibraryInfo getHelloWorldPluginInfo() {
return {LLVM_PLUGIN_API_VERSION, "HelloWorld", LLVM_VERSION_STRING,
[](PassBuilder &PB) {
PB.registerPipelineParsingCallback(
[](StringRef Name, FunctionPassManager &FPM,
ArrayRef<PassBuilder::PipelineElement>) {
if (Name == "hello-world") {
FPM.addPass(HelloWorld());
return true;
}
return false;
});
}};
}
// This is the core interface for pass plugins. It guarantees that 'opt' will
// be able to recognize HelloWorld when added to the pass pipeline on the
// command line, i.e. via '-passes=hello-world'
extern "C" LLVM_ATTRIBUTE_WEAK ::llvm::PassPluginLibraryInfo
llvmGetPassPluginInfo() {
return getHelloWorldPluginInfo();
}