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
132
133
134
|
/*
* Copyright (C) 2012 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "runtime_support_builder_arm.h"
#include "ir_builder.h"
#include "thread.h"
#include "utils_llvm.h"
#include <llvm/IR/DerivedTypes.h>
#include <llvm/IR/Function.h>
#include <llvm/IR/InlineAsm.h>
#include <llvm/IR/Module.h>
#include <llvm/IR/Type.h>
#include <vector>
using namespace llvm;
namespace {
char LDRSTRSuffixByType(art::llvm::IRBuilder& irb, ::llvm::Type* type) {
int width = type->isPointerTy() ?
irb.getSizeOfPtrEquivInt()*8 :
::llvm::cast<IntegerType>(type)->getBitWidth();
switch (width) {
case 8: return 'b';
case 16: return 'h';
case 32: return ' ';
default:
LOG(FATAL) << "Unsupported width: " << width;
return ' ';
}
}
} // namespace
namespace art {
namespace llvm {
/* Thread */
::llvm::Value* RuntimeSupportBuilderARM::EmitGetCurrentThread() {
Function* ori_func = GetRuntimeSupportFunction(runtime_support::GetCurrentThread);
InlineAsm* func = InlineAsm::get(ori_func->getFunctionType(), "mov $0, r9", "=r", false);
CallInst* thread = irb_.CreateCall(func);
thread->setDoesNotAccessMemory();
irb_.SetTBAA(thread, kTBAAConstJObject);
return thread;
}
::llvm::Value* RuntimeSupportBuilderARM::EmitLoadFromThreadOffset(int64_t offset, ::llvm::Type* type,
TBAASpecialType s_ty) {
FunctionType* func_ty = FunctionType::get(/*Result=*/type,
/*isVarArg=*/false);
std::string inline_asm(StringPrintf("ldr%c $0, [r9, #%d]",
LDRSTRSuffixByType(irb_, type),
static_cast<int>(offset)));
InlineAsm* func = InlineAsm::get(func_ty, inline_asm, "=r", true);
CallInst* result = irb_.CreateCall(func);
result->setOnlyReadsMemory();
irb_.SetTBAA(result, s_ty);
return result;
}
void RuntimeSupportBuilderARM::EmitStoreToThreadOffset(int64_t offset, ::llvm::Value* value,
TBAASpecialType s_ty) {
FunctionType* func_ty = FunctionType::get(/*Result=*/Type::getVoidTy(context_),
/*Params=*/value->getType(),
/*isVarArg=*/false);
std::string inline_asm(StringPrintf("str%c $0, [r9, #%d]",
LDRSTRSuffixByType(irb_, value->getType()),
static_cast<int>(offset)));
InlineAsm* func = InlineAsm::get(func_ty, inline_asm, "r", true);
CallInst* call_inst = irb_.CreateCall(func, value);
irb_.SetTBAA(call_inst, s_ty);
}
::llvm::Value*
RuntimeSupportBuilderARM::EmitSetCurrentThread(::llvm::Value* thread) {
// Separate to two InlineAsm: The first one produces the return value, while the second,
// sets the current thread.
// LLVM can delete the first one if the caller in LLVM IR doesn't use the return value.
//
// Here we don't call EmitGetCurrentThread, because we mark it as DoesNotAccessMemory and
// ConstJObject. We denote side effect to "true" below instead, so LLVM won't
// reorder these instructions incorrectly.
Function* ori_func = GetRuntimeSupportFunction(runtime_support::GetCurrentThread);
InlineAsm* func = InlineAsm::get(ori_func->getFunctionType(), "mov $0, r9", "=r", true);
CallInst* old_thread_register = irb_.CreateCall(func);
old_thread_register->setOnlyReadsMemory();
FunctionType* func_ty = FunctionType::get(/*Result=*/Type::getVoidTy(context_),
/*Params=*/irb_.getJObjectTy(),
/*isVarArg=*/false);
func = InlineAsm::get(func_ty, "mov r9, $0", "r", true);
irb_.CreateCall(func, thread);
return old_thread_register;
}
/* Monitor */
void RuntimeSupportBuilderARM::EmitLockObject(::llvm::Value* object) {
RuntimeSupportBuilder::EmitLockObject(object);
FunctionType* func_ty = FunctionType::get(/*Result=*/Type::getVoidTy(context_),
/*isVarArg=*/false);
InlineAsm* func = InlineAsm::get(func_ty, "dmb sy", "", true);
irb_.CreateCall(func);
}
void RuntimeSupportBuilderARM::EmitUnlockObject(::llvm::Value* object) {
RuntimeSupportBuilder::EmitUnlockObject(object);
FunctionType* func_ty = FunctionType::get(/*Result=*/Type::getVoidTy(context_),
/*isVarArg=*/false);
InlineAsm* func = InlineAsm::get(func_ty, "dmb sy", "", true);
irb_.CreateCall(func);
}
} // namespace llvm
} // namespace art
|
