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Register the GCOV writeout functions so that they're emitted serially.

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We don't want to write out >1000 files at the same time. That could make things
prohibitively expensive. Instead, register the "writeout" function so that it's
emitted serially.
<rdar://problem/12439551>

llvm-svn: 177437
This commit is contained in:
Bill Wendling 2013-03-19 21:03:22 +00:00
parent 6c0ef5bcb5
commit a13b16073f
1 changed files with 31 additions and 10 deletions
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41
lib/Transforms/Instrumentation/GCOVProfiling.cpp
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@ -101,6 +101,7 @@ namespace {
Constant *getIncrementIndirectCounterFunc();
Constant *getEmitFunctionFunc();
Constant *getEmitArcsFunc();
Constant *getDeleteWriteoutFunctionListFunc();
Constant *getDeleteFlushFunctionListFunc();
Constant *getEndFileFunc();
@ -550,8 +551,8 @@ bool GCOVProfiler::emitProfileArcs() {
Function *FlushF = insertFlush(CountersBySP);
// Create a small bit of code that registers the "__llvm_gcov_writeout" to
// be executed at exit and the "__llvm_gcov_flush" function to be executed
// when "__gcov_flush" is called.
// be executed at exit and the "__llvm_gcov_flush" function to be executed
// when "__gcov_flush" is called.
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
Function *F = Function::Create(FTy, GlobalValue::InternalLinkage,
"__llvm_gcov_init", M);
@ -564,21 +565,36 @@ bool GCOVProfiler::emitProfileArcs() {
BasicBlock *BB = BasicBlock::Create(*Ctx, "entry", F);
IRBuilder<> Builder(BB);
FTy = FunctionType::get(Builder.getInt32Ty(),
PointerType::get(FTy, 0), false);
Constant *AtExitFn = M->getOrInsertFunction("atexit", FTy);
Builder.CreateCall(AtExitFn, WriteoutF);
// Register the local flush function.
FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
FTy = FunctionType::get(Builder.getVoidTy(),
PointerType::get(FTy, 0), false);
// Register the local writeout function.
Constant *RegWriteout =
M->getOrInsertFunction("llvm_register_writeout_function", FTy);
Builder.CreateCall(RegWriteout, WriteoutF);
// Register the local flush function.
Constant *RegFlush =
M->getOrInsertFunction("llvm_register_flush_function", FTy);
Builder.CreateCall(RegFlush, FlushF);
// Make sure that all the flush function list is deleted.
Builder.CreateCall(AtExitFn, getDeleteFlushFunctionListFunc());
if (M->getFunction("main")) {
Constant *AtExitFn = M->getOrInsertFunction("atexit", FTy);
// In the module that has the 'main' function, make sure that the flush
// and writeout function lists are deleted. Also make sure that the
// writeout function list is deleted.
Builder.CreateCall(AtExitFn, getDeleteWriteoutFunctionListFunc());
Builder.CreateCall(AtExitFn, getDeleteFlushFunctionListFunc());
// Make sure we write out all files when exiting. Note: This is called
// first from atexit().
FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
Builder.CreateCall(AtExitFn,
M->getOrInsertFunction("__llvm_writeout_files", FTy));
}
Builder.CreateRetVoid();
appendToGlobalCtors(*M, F, 0);
@ -677,6 +693,11 @@ Constant *GCOVProfiler::getEmitArcsFunc() {
return M->getOrInsertFunction("llvm_gcda_emit_arcs", FTy);
}
Constant *GCOVProfiler::getDeleteWriteoutFunctionListFunc() {
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
return M->getOrInsertFunction("llvm_delete_writeout_function_list", FTy);
}
Constant *GCOVProfiler::getDeleteFlushFunctionListFunc() {
FunctionType *FTy = FunctionType::get(Type::getVoidTy(*Ctx), false);
return M->getOrInsertFunction("llvm_delete_flush_function_list", FTy);