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//===- FunctionTest.cpp - Function unit tests -----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.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());
// Checking that getArg gets the arguments from F1 in the correct order.
unsigned i = 0;
for (Argument &A : F->args()) {
EXPECT_EQ(&A, F->getArg(i));
++i;
}
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);
I++;
}
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);
I++;
}
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);
I++;
}
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());
}
// Test setting and removing section information
TEST(FunctionTest, setSection) {
LLVMContext C;
Module M("test", C);
llvm::Function *F =
Function::Create(llvm::FunctionType::get(llvm::Type::getVoidTy(C), false),
llvm::GlobalValue::ExternalLinkage, "F", &M);
F->setSection(".text.test");
EXPECT_TRUE(F->getSection() == ".text.test");
EXPECT_TRUE(F->hasSection());
F->setSection("");
EXPECT_FALSE(F->hasSection());
F->setSection(".text.test");
F->setSection(".text.test2");
EXPECT_TRUE(F->getSection() == ".text.test2");
EXPECT_TRUE(F->hasSection());
}
TEST(FunctionTest, GetPointerAlignment) {
LLVMContext Context;
Type *VoidType(Type::getVoidTy(Context));
FunctionType *FuncType(FunctionType::get(VoidType, false));
std::unique_ptr<Function> Func(Function::Create(
FuncType, GlobalValue::ExternalLinkage));
EXPECT_EQ(Align(1), Func->getPointerAlignment(DataLayout("")));
EXPECT_EQ(Align(1), Func->getPointerAlignment(DataLayout("Fi8")));
EXPECT_EQ(Align(1), Func->getPointerAlignment(DataLayout("Fn8")));
EXPECT_EQ(Align(2), Func->getPointerAlignment(DataLayout("Fi16")));
EXPECT_EQ(Align(2), Func->getPointerAlignment(DataLayout("Fn16")));
EXPECT_EQ(Align(4), Func->getPointerAlignment(DataLayout("Fi32")));
EXPECT_EQ(Align(4), Func->getPointerAlignment(DataLayout("Fn32")));
Func->setAlignment(Align(4));
EXPECT_EQ(Align(1), Func->getPointerAlignment(DataLayout("")));
EXPECT_EQ(Align(1), Func->getPointerAlignment(DataLayout("Fi8")));
EXPECT_EQ(Align(4), Func->getPointerAlignment(DataLayout("Fn8")));
EXPECT_EQ(Align(2), Func->getPointerAlignment(DataLayout("Fi16")));
EXPECT_EQ(Align(4), Func->getPointerAlignment(DataLayout("Fn16")));
EXPECT_EQ(Align(4), Func->getPointerAlignment(DataLayout("Fi32")));
EXPECT_EQ(Align(4), Func->getPointerAlignment(DataLayout("Fn32")));
}
} // end namespace
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