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//===- FunctionTest.cpp - Function unit tests -----------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Function.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
TEST(FunctionTest, hasLazyArguments) {
LLVMContext C;
Type *ArgTypes[] = {Type::getInt8Ty(C), Type::getInt32Ty(C)};
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), ArgTypes, false);
// Functions start out with lazy arguments.
std::unique_ptr<Function> F(
Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
EXPECT_TRUE(F->hasLazyArguments());
// Checking for empty or size shouldn't force arguments to be instantiated.
EXPECT_FALSE(F->arg_empty());
EXPECT_TRUE(F->hasLazyArguments());
EXPECT_EQ(2u, F->arg_size());
EXPECT_TRUE(F->hasLazyArguments());
// The argument list should be populated at first access.
(void)F->arg_begin();
EXPECT_FALSE(F->hasLazyArguments());
}
TEST(FunctionTest, stealArgumentListFrom) {
LLVMContext C;
Type *ArgTypes[] = {Type::getInt8Ty(C), Type::getInt32Ty(C)};
FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), ArgTypes, false);
std::unique_ptr<Function> F1(
Function::Create(FTy, GlobalValue::ExternalLinkage, "F1"));
std::unique_ptr<Function> F2(
Function::Create(FTy, GlobalValue::ExternalLinkage, "F1"));
EXPECT_TRUE(F1->hasLazyArguments());
EXPECT_TRUE(F2->hasLazyArguments());
// Steal arguments before they've been accessed. Nothing should change; both
// functions should still have lazy arguments.
//
// steal(empty); drop (empty)
F1->stealArgumentListFrom(*F2);
EXPECT_TRUE(F1->hasLazyArguments());
EXPECT_TRUE(F2->hasLazyArguments());
// Save arguments from F1 for later assertions. F1 won't have lazy arguments
// anymore.
SmallVector<Argument *, 4> Args;
for (Argument &A : F1->args())
Args.push_back(&A);
EXPECT_EQ(2u, Args.size());
EXPECT_FALSE(F1->hasLazyArguments());
// Steal arguments from F1 to F2. F1's arguments should be lazy again.
//
// steal(real); drop (empty)
F2->stealArgumentListFrom(*F1);
EXPECT_TRUE(F1->hasLazyArguments());
EXPECT_FALSE(F2->hasLazyArguments());
unsigned I = 0;
for (Argument &A : F2->args())
EXPECT_EQ(Args[I++], &A);
EXPECT_EQ(2u, I);
// Check that arguments in F1 don't have pointer equality with the saved ones.
// This also instantiates F1's arguments.
I = 0;
for (Argument &A : F1->args())
EXPECT_NE(Args[I++], &A);
EXPECT_EQ(2u, I);
EXPECT_FALSE(F1->hasLazyArguments());
EXPECT_FALSE(F2->hasLazyArguments());
// Steal back from F2. F2's arguments should be lazy again.
//
// steal(real); drop (real)
F1->stealArgumentListFrom(*F2);
EXPECT_FALSE(F1->hasLazyArguments());
EXPECT_TRUE(F2->hasLazyArguments());
I = 0;
for (Argument &A : F1->args())
EXPECT_EQ(Args[I++], &A);
EXPECT_EQ(2u, I);
// Steal from F2 a second time. Now both functions should have lazy
// arguments.
//
// steal(empty); drop (real)
F1->stealArgumentListFrom(*F2);
EXPECT_TRUE(F1->hasLazyArguments());
EXPECT_TRUE(F2->hasLazyArguments());
}
} // end namespace
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