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
|
//===-- addFuncEntryCallPass.cpp - Optimize druntime calls ----------------===//
//
// LDC – the LLVM D compiler
//
// This file is distributed under the University of Illinois Open Source
// License. See the LICENSE file for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/Pass.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
using namespace llvm;
namespace {
class FuncEntryCallPass : public FunctionPass {
Value *funcToCallUponEntry = nullptr;
public:
static char ID;
FuncEntryCallPass() : FunctionPass(ID) {}
bool doInitialization(Module &M) override;
bool runOnFunction(Function &F) override;
};
}
char FuncEntryCallPass::ID = 0;
bool FuncEntryCallPass::doInitialization(Module &M) {
// Add fwd declaration of the `void __test_funcentrycall(void)` function.
auto functionType = FunctionType::get(Type::getVoidTy(M.getContext()), false);
funcToCallUponEntry =
M.getOrInsertFunction("__test_funcentrycall", functionType)
#if LLVM_VERSION >= 900
.getCallee()
#endif
;
return true;
}
bool FuncEntryCallPass::runOnFunction(Function &F) {
// Add call to `__test_funcentrycall(void)` at the start of _every_ function
// (this includes e.g. `ldc.register_dso`!)
llvm::BasicBlock &block = F.getEntryBlock();
IRBuilder<> builder(&block, block.begin());
#if LLVM_VERSION >= 1100
builder.CreateCall(FunctionCallee(cast<Function>(funcToCallUponEntry)));
#else
builder.CreateCall(funcToCallUponEntry);
#endif
return true;
}
static void addFuncEntryCallPass(const PassManagerBuilder &,
legacy::PassManagerBase &PM) {
PM.add(new FuncEntryCallPass());
}
// Registration of the plugin's pass is done by the plugin's static constructor.
static RegisterStandardPasses
RegisterFuncEntryCallPass0(PassManagerBuilder::EP_EnabledOnOptLevel0,
addFuncEntryCallPass);
|
