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b8216896df
Instead of copying arguments from the source function to the
destination, steal them. This has a few advantages.
- The ValueMap doesn't need to be seeded with (or cleared of)
Arguments.
- Often the destination function won't have created any arguments yet,
so this avoids malloc traffic.
- Argument names don't need to be copied.
Because argument lists are lazy, this required a new
Function::stealArgumentListFrom helper.
llvm-svn: 265519
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
//===- FunctionTest.cpp - Function unit tests -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/Function.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(FunctionTest, hasLazyArguments) {
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LLVMContext C;
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Type *ArgTypes[] = {Type::getInt8Ty(C), Type::getInt32Ty(C)};
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), ArgTypes, false);
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// Functions start out with lazy arguments.
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std::unique_ptr<Function> F(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F"));
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EXPECT_TRUE(F->hasLazyArguments());
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// Checking for empty or size shouldn't force arguments to be instantiated.
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EXPECT_FALSE(F->arg_empty());
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EXPECT_TRUE(F->hasLazyArguments());
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EXPECT_EQ(2u, F->arg_size());
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EXPECT_TRUE(F->hasLazyArguments());
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// The argument list should be populated at first access.
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(void)F->arg_begin();
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EXPECT_FALSE(F->hasLazyArguments());
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}
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TEST(FunctionTest, stealArgumentListFrom) {
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LLVMContext C;
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Type *ArgTypes[] = {Type::getInt8Ty(C), Type::getInt32Ty(C)};
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FunctionType *FTy = FunctionType::get(Type::getVoidTy(C), ArgTypes, false);
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std::unique_ptr<Function> F1(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F1"));
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std::unique_ptr<Function> F2(
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Function::Create(FTy, GlobalValue::ExternalLinkage, "F1"));
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EXPECT_TRUE(F1->hasLazyArguments());
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EXPECT_TRUE(F2->hasLazyArguments());
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// Steal arguments before they've been accessed. Nothing should change; both
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// functions should still have lazy arguments.
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//
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// steal(empty); drop (empty)
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F1->stealArgumentListFrom(*F2);
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EXPECT_TRUE(F1->hasLazyArguments());
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EXPECT_TRUE(F2->hasLazyArguments());
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// Save arguments from F1 for later assertions. F1 won't have lazy arguments
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// anymore.
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SmallVector<Argument *, 4> Args;
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for (Argument &A : F1->args())
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Args.push_back(&A);
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EXPECT_EQ(2u, Args.size());
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EXPECT_FALSE(F1->hasLazyArguments());
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// Steal arguments from F1 to F2. F1's arguments should be lazy again.
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//
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// steal(real); drop (empty)
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F2->stealArgumentListFrom(*F1);
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EXPECT_TRUE(F1->hasLazyArguments());
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EXPECT_FALSE(F2->hasLazyArguments());
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unsigned I = 0;
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for (Argument &A : F2->args())
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EXPECT_EQ(Args[I++], &A);
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EXPECT_EQ(2u, I);
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// Check that arguments in F1 don't have pointer equality with the saved ones.
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// This also instantiates F1's arguments.
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I = 0;
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for (Argument &A : F1->args())
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EXPECT_NE(Args[I++], &A);
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EXPECT_EQ(2u, I);
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EXPECT_FALSE(F1->hasLazyArguments());
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EXPECT_FALSE(F2->hasLazyArguments());
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// Steal back from F2. F2's arguments should be lazy again.
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//
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// steal(real); drop (real)
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F1->stealArgumentListFrom(*F2);
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EXPECT_FALSE(F1->hasLazyArguments());
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EXPECT_TRUE(F2->hasLazyArguments());
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I = 0;
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for (Argument &A : F1->args())
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EXPECT_EQ(Args[I++], &A);
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EXPECT_EQ(2u, I);
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// Steal from F2 a second time. Now both functions should have lazy
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// arguments.
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//
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// steal(empty); drop (real)
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F1->stealArgumentListFrom(*F2);
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EXPECT_TRUE(F1->hasLazyArguments());
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EXPECT_TRUE(F2->hasLazyArguments());
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}
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} // end namespace
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