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//===- llvm/unittest/IR/StructuralHashTest.cpp ----------------------------===//
//
// 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/StructuralHash.h"
#include "llvm/AsmParser/Parser.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/SourceMgr.h"
#include "gtest/gtest.h"
#include <memory>
using namespace llvm;
namespace {
std::unique_ptr<Module> parseIR(LLVMContext &Context, const char *IR) {
SMDiagnostic Err;
std::unique_ptr<Module> M = parseAssemblyString(IR, Err, Context);
if (!M)
Err.print("StructuralHashTest", errs());
return M;
}
TEST(StructuralHashTest, Empty) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "");
std::unique_ptr<Module> M2 = parseIR(Ctx, "");
EXPECT_EQ(StructuralHash(*M1), StructuralHash(*M2));
}
TEST(StructuralHashTest, Basic) {
LLVMContext Ctx;
std::unique_ptr<Module> M0 = parseIR(Ctx, "");
std::unique_ptr<Module> M1 = parseIR(Ctx, "define void @f() { ret void }");
std::unique_ptr<Module> M2 = parseIR(Ctx, "define void @f() { ret void }");
std::unique_ptr<Module> M3 = parseIR(Ctx, "@g = global i32 2");
std::unique_ptr<Module> M4 = parseIR(Ctx, "@g = global i32 2");
EXPECT_NE(StructuralHash(*M0), StructuralHash(*M1));
EXPECT_NE(StructuralHash(*M0), StructuralHash(*M3));
EXPECT_NE(StructuralHash(*M1), StructuralHash(*M3));
EXPECT_EQ(StructuralHash(*M1), StructuralHash(*M2));
EXPECT_EQ(StructuralHash(*M3), StructuralHash(*M4));
}
TEST(StructuralHashTest, BasicFunction) {
LLVMContext Ctx;
std::unique_ptr<Module> M = parseIR(Ctx, "define void @f() {\n"
" ret void\n"
"}\n"
"define void @g() {\n"
" ret void\n"
"}\n"
"define i32 @h(i32 %i) {\n"
" ret i32 %i\n"
"}\n");
EXPECT_EQ(StructuralHash(*M->getFunction("f")),
StructuralHash(*M->getFunction("g")));
EXPECT_NE(StructuralHash(*M->getFunction("f")),
StructuralHash(*M->getFunction("h")));
}
TEST(StructuralHashTest, Declaration) {
LLVMContext Ctx;
std::unique_ptr<Module> M0 = parseIR(Ctx, "");
std::unique_ptr<Module> M1 = parseIR(Ctx, "declare void @f()");
std::unique_ptr<Module> M2 = parseIR(Ctx, "@g = external global i32");
EXPECT_EQ(StructuralHash(*M0), StructuralHash(*M1));
EXPECT_EQ(StructuralHash(*M0), StructuralHash(*M2));
}
TEST(StructuralHashTest, GlobalType) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "@g = global i32 1");
std::unique_ptr<Module> M2 = parseIR(Ctx, "@g = global float 1.0");
EXPECT_NE(StructuralHash(*M1), StructuralHash(*M2));
}
TEST(StructuralHashTest, Function) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "define void @f() { ret void }");
std::unique_ptr<Module> M2 = parseIR(Ctx, "define void @f(i32) { ret void }");
EXPECT_NE(StructuralHash(*M1), StructuralHash(*M2));
}
TEST(StructuralHashTest, FunctionRetType) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "define void @f() { ret void }");
std::unique_ptr<Module> M2 = parseIR(Ctx, "define i32 @f() { ret i32 0 }");
// FIXME: should be different
EXPECT_EQ(StructuralHash(*M1), StructuralHash(*M2));
}
TEST(StructuralHashTest, InstructionOpCode) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "define void @f(ptr %p) {\n"
" %a = load i32, ptr %p\n"
" ret void\n"
"}\n");
std::unique_ptr<Module> M2 =
parseIR(Ctx, "define void @f(ptr %p) {\n"
" %a = getelementptr i8, ptr %p, i32 1\n"
" ret void\n"
"}\n");
EXPECT_NE(StructuralHash(*M1), StructuralHash(*M2));
}
TEST(StructuralHashTest, InstructionType) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "define void @f(ptr %p) {\n"
" %a = load i32, ptr %p\n"
" ret void\n"
"}\n");
std::unique_ptr<Module> M2 = parseIR(Ctx, "define void @f(ptr %p) {\n"
" %a = load i64, ptr %p\n"
" ret void\n"
"}\n");
// FIXME: should be different
EXPECT_EQ(StructuralHash(*M1), StructuralHash(*M2));
}
TEST(StructuralHashTest, IgnoredMetadata) {
LLVMContext Ctx;
std::unique_ptr<Module> M1 = parseIR(Ctx, "@a = global i32 1\n");
// clang-format off
std::unique_ptr<Module> M2 = parseIR(
Ctx, R"(
@a = global i32 1
@llvm.embedded.object = private constant [4 x i8] c"BC\C0\00", section ".llvm.lto", align 1, !exclude !0
@llvm.compiler.used = appending global [1 x ptr] [ptr @llvm.embedded.object], section "llvm.metadata"
!llvm.embedded.objects = !{!1}
!0 = !{}
!1 = !{ptr @llvm.embedded.object, !".llvm.lto"}
)");
EXPECT_EQ(StructuralHash(*M1), StructuralHash(*M2));
}
} // end anonymous namespace
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