1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
|
//===- JITTest.cpp - Unit tests for the JIT -------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/BasicBlock.h"
#include "llvm/Constant.h"
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/ExecutionEngine/JIT.h"
#include "llvm/ExecutionEngine/JITMemoryManager.h"
#include "llvm/Function.h"
#include "llvm/GlobalValue.h"
#include "llvm/GlobalVariable.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/ModuleProvider.h"
#include "llvm/Support/IRBuilder.h"
#include "llvm/Target/TargetSelect.h"
#include "llvm/Type.h"
using namespace llvm;
namespace {
Function *makeReturnGlobal(std::string Name, GlobalVariable *G, Module *M) {
std::vector<const Type*> params;
const FunctionType *FTy =
getGlobalContext().getFunctionType(G->getType()->getElementType(),
params, false);
Function *F = Function::Create(FTy, GlobalValue::ExternalLinkage, Name, M);
BasicBlock *Entry = BasicBlock::Create("entry", F);
IRBuilder<> builder(Entry);
Value *Load = builder.CreateLoad(G);
const Type *GTy = G->getType()->getElementType();
Value *Add = builder.CreateAdd(Load, ConstantInt::get(GTy, 1LL));
builder.CreateStore(Add, G);
builder.CreateRet(Add);
return F;
}
// Regression test for a bug. The JIT used to allocate globals inside the same
// memory block used for the function, and when the function code was freed,
// the global was left in the same place. This test allocates a function
// that uses and global, deallocates it, and then makes sure that the global
// stays alive after that.
TEST(JIT, GlobalInFunction) {
LLVMContext context;
Module *M = new Module("<main>", context);
ExistingModuleProvider *MP = new ExistingModuleProvider(M);
JITMemoryManager *MemMgr = JITMemoryManager::CreateDefaultMemManager();
// Tell the memory manager to poison freed memory so that accessing freed
// memory is more easily tested.
MemMgr->setPoisonMemory(true);
std::string Error;
OwningPtr<ExecutionEngine> JIT(EngineBuilder(MP)
.setEngineKind(EngineKind::JIT)
.setErrorStr(&Error)
.setJITMemoryManager(MemMgr)
// The next line enables the fix:
.setAllocateGVsWithCode(false)
.create());
ASSERT_EQ(Error, "");
// Create a global variable.
const Type *GTy = Type::Int32Ty;
GlobalVariable *G = new GlobalVariable(
*M,
GTy,
false, // Not constant.
GlobalValue::InternalLinkage,
context.getNullValue(GTy),
"myglobal");
// Make a function that points to a global.
Function *F1 = makeReturnGlobal("F1", G, M);
// Get the pointer to the native code to force it to JIT the function and
// allocate space for the global.
void (*F1Ptr)();
// Hack to avoid ISO C++ warning about casting function pointers.
*(void**)(void*)&F1Ptr = JIT->getPointerToFunction(F1);
// Since F1 was codegen'd, a pointer to G should be available.
int32_t *GPtr = (int32_t*)JIT->getPointerToGlobalIfAvailable(G);
ASSERT_NE((int32_t*)NULL, GPtr);
EXPECT_EQ(0, *GPtr);
// F1() should increment G.
F1Ptr();
EXPECT_EQ(1, *GPtr);
// Make a second function identical to the first, referring to the same
// global.
Function *F2 = makeReturnGlobal("F2", G, M);
// Hack to avoid ISO C++ warning about casting function pointers.
void (*F2Ptr)();
*(void**)(void*)&F2Ptr = JIT->getPointerToFunction(F2);
// F2() should increment G.
F2Ptr();
EXPECT_EQ(2, *GPtr);
// Deallocate F1.
JIT->freeMachineCodeForFunction(F1);
// F2() should *still* increment G.
F2Ptr();
EXPECT_EQ(3, *GPtr);
}
// This code is copied from JITEventListenerTest, but it only runs once for all
// the tests in this directory. Everything seems fine, but that's strange
// behavior.
class JITEnvironment : public testing::Environment {
virtual void SetUp() {
// Required to create a JIT.
InitializeNativeTarget();
}
};
testing::Environment* const jit_env =
testing::AddGlobalTestEnvironment(new JITEnvironment);
}
|
