Home | History | Annotate | Download | only in utils 
      1 /*
      2  * Copyright (C) 2011 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #include "assembler.h"
     18 
     19 #include <algorithm>
     20 #include <vector>
     21 
     22 #ifdef ART_ENABLE_CODEGEN_arm
     23 #include "arm/assembler_arm32.h"
     24 #include "arm/assembler_thumb2.h"
     25 #endif
     26 #ifdef ART_ENABLE_CODEGEN_arm64
     27 #include "arm64/assembler_arm64.h"
     28 #endif
     29 #ifdef ART_ENABLE_CODEGEN_mips
     30 #include "mips/assembler_mips.h"
     31 #endif
     32 #ifdef ART_ENABLE_CODEGEN_mips64
     33 #include "mips64/assembler_mips64.h"
     34 #endif
     35 #ifdef ART_ENABLE_CODEGEN_x86
     36 #include "x86/assembler_x86.h"
     37 #endif
     38 #ifdef ART_ENABLE_CODEGEN_x86_64
     39 #include "x86_64/assembler_x86_64.h"
     40 #endif
     41 #include "base/casts.h"
     42 #include "globals.h"
     43 #include "memory_region.h"
     44 
     45 namespace art {
     46 
     47 AssemblerBuffer::AssemblerBuffer(ArenaAllocator* arena)
     48     : arena_(arena) {
     49   static const size_t kInitialBufferCapacity = 4 * KB;
     50   contents_ = arena_->AllocArray<uint8_t>(kInitialBufferCapacity, kArenaAllocAssembler);
     51   cursor_ = contents_;
     52   limit_ = ComputeLimit(contents_, kInitialBufferCapacity);
     53   fixup_ = nullptr;
     54   slow_path_ = nullptr;
     55 #ifndef NDEBUG
     56   has_ensured_capacity_ = false;
     57   fixups_processed_ = false;
     58 #endif
     59 
     60   // Verify internal state.
     61   CHECK_EQ(Capacity(), kInitialBufferCapacity);
     62   CHECK_EQ(Size(), 0U);
     63 }
     64 
     65 
     66 AssemblerBuffer::~AssemblerBuffer() {
     67   if (arena_->IsRunningOnMemoryTool()) {
     68     arena_->MakeInaccessible(contents_, Capacity());
     69   }
     70 }
     71 
     72 
     73 void AssemblerBuffer::ProcessFixups(const MemoryRegion& region) {
     74   AssemblerFixup* fixup = fixup_;
     75   while (fixup != nullptr) {
     76     fixup->Process(region, fixup->position());
     77     fixup = fixup->previous();
     78   }
     79 }
     80 
     81 
     82 void AssemblerBuffer::FinalizeInstructions(const MemoryRegion& instructions) {
     83   // Copy the instructions from the buffer.
     84   MemoryRegion from(reinterpret_cast<void*>(contents()), Size());
     85   instructions.CopyFrom(0, from);
     86   // Process fixups in the instructions.
     87   ProcessFixups(instructions);
     88 #ifndef NDEBUG
     89   fixups_processed_ = true;
     90 #endif
     91 }
     92 
     93 
     94 void AssemblerBuffer::ExtendCapacity(size_t min_capacity) {
     95   size_t old_size = Size();
     96   size_t old_capacity = Capacity();
     97   DCHECK_GT(min_capacity, old_capacity);
     98   size_t new_capacity = std::min(old_capacity * 2, old_capacity + 1 * MB);
     99   new_capacity = std::max(new_capacity, min_capacity);
    100 
    101   // Allocate the new data area and copy contents of the old one to it.
    102   contents_ = reinterpret_cast<uint8_t*>(
    103       arena_->Realloc(contents_, old_capacity, new_capacity, kArenaAllocAssembler));
    104 
    105   // Update the cursor and recompute the limit.
    106   cursor_ = contents_ + old_size;
    107   limit_ = ComputeLimit(contents_, new_capacity);
    108 
    109   // Verify internal state.
    110   CHECK_EQ(Capacity(), new_capacity);
    111   CHECK_EQ(Size(), old_size);
    112 }
    113 
    114 void DebugFrameOpCodeWriterForAssembler::ImplicitlyAdvancePC() {
    115   uint32_t pc = dchecked_integral_cast<uint32_t>(assembler_->CodeSize());
    116   if (delay_emitting_advance_pc_) {
    117     uint32_t stream_pos = dchecked_integral_cast<uint32_t>(opcodes_.size());
    118     delayed_advance_pcs_.push_back(DelayedAdvancePC {stream_pos, pc});
    119   } else {
    120     AdvancePC(pc);
    121   }
    122 }
    123 
    124 std::unique_ptr<Assembler> Assembler::Create(
    125     ArenaAllocator* arena,
    126     InstructionSet instruction_set,
    127     const InstructionSetFeatures* instruction_set_features) {
    128   switch (instruction_set) {
    129 #ifdef ART_ENABLE_CODEGEN_arm
    130     case kArm:
    131       return std::unique_ptr<Assembler>(new (arena) arm::Arm32Assembler(arena));
    132     case kThumb2:
    133       return std::unique_ptr<Assembler>(new (arena) arm::Thumb2Assembler(arena));
    134 #endif
    135 #ifdef ART_ENABLE_CODEGEN_arm64
    136     case kArm64:
    137       return std::unique_ptr<Assembler>(new (arena) arm64::Arm64Assembler(arena));
    138 #endif
    139 #ifdef ART_ENABLE_CODEGEN_mips
    140     case kMips:
    141       return std::unique_ptr<Assembler>(new (arena) mips::MipsAssembler(
    142           arena,
    143           instruction_set_features != nullptr
    144               ? instruction_set_features->AsMipsInstructionSetFeatures()
    145               : nullptr));
    146 #endif
    147 #ifdef ART_ENABLE_CODEGEN_mips64
    148     case kMips64:
    149       return std::unique_ptr<Assembler>(new (arena) mips64::Mips64Assembler(arena));
    150 #endif
    151 #ifdef ART_ENABLE_CODEGEN_x86
    152     case kX86:
    153       return std::unique_ptr<Assembler>(new (arena) x86::X86Assembler(arena));
    154 #endif
    155 #ifdef ART_ENABLE_CODEGEN_x86_64
    156     case kX86_64:
    157       return std::unique_ptr<Assembler>(new (arena) x86_64::X86_64Assembler(arena));
    158 #endif
    159     default:
    160       LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
    161       return nullptr;
    162   }
    163 }
    164 
    165 void Assembler::StoreImmediateToThread32(ThreadOffset<4> dest ATTRIBUTE_UNUSED,
    166                                          uint32_t imm ATTRIBUTE_UNUSED,
    167                                          ManagedRegister scratch ATTRIBUTE_UNUSED) {
    168   UNIMPLEMENTED(FATAL);
    169 }
    170 
    171 void Assembler::StoreImmediateToThread64(ThreadOffset<8> dest ATTRIBUTE_UNUSED,
    172                                          uint32_t imm ATTRIBUTE_UNUSED,
    173                                          ManagedRegister scratch ATTRIBUTE_UNUSED) {
    174   UNIMPLEMENTED(FATAL);
    175 }
    176 
    177 void Assembler::StoreStackOffsetToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
    178                                            FrameOffset fr_offs ATTRIBUTE_UNUSED,
    179                                            ManagedRegister scratch ATTRIBUTE_UNUSED) {
    180   UNIMPLEMENTED(FATAL);
    181 }
    182 
    183 void Assembler::StoreStackOffsetToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
    184                                            FrameOffset fr_offs ATTRIBUTE_UNUSED,
    185                                            ManagedRegister scratch ATTRIBUTE_UNUSED) {
    186   UNIMPLEMENTED(FATAL);
    187 }
    188 
    189 void Assembler::StoreStackPointerToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED) {
    190   UNIMPLEMENTED(FATAL);
    191 }
    192 
    193 void Assembler::StoreStackPointerToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED) {
    194   UNIMPLEMENTED(FATAL);
    195 }
    196 
    197 void Assembler::LoadFromThread32(ManagedRegister dest ATTRIBUTE_UNUSED,
    198                                  ThreadOffset<4> src ATTRIBUTE_UNUSED,
    199                                  size_t size ATTRIBUTE_UNUSED) {
    200   UNIMPLEMENTED(FATAL);
    201 }
    202 
    203 void Assembler::LoadFromThread64(ManagedRegister dest ATTRIBUTE_UNUSED,
    204                                  ThreadOffset<8> src ATTRIBUTE_UNUSED,
    205                                  size_t size ATTRIBUTE_UNUSED) {
    206   UNIMPLEMENTED(FATAL);
    207 }
    208 
    209 void Assembler::LoadRawPtrFromThread32(ManagedRegister dest ATTRIBUTE_UNUSED,
    210                                        ThreadOffset<4> offs ATTRIBUTE_UNUSED) {
    211   UNIMPLEMENTED(FATAL);
    212 }
    213 
    214 void Assembler::LoadRawPtrFromThread64(ManagedRegister dest ATTRIBUTE_UNUSED,
    215                                        ThreadOffset<8> offs ATTRIBUTE_UNUSED) {
    216   UNIMPLEMENTED(FATAL);
    217 }
    218 
    219 void Assembler::CopyRawPtrFromThread32(FrameOffset fr_offs ATTRIBUTE_UNUSED,
    220                                        ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
    221                                        ManagedRegister scratch ATTRIBUTE_UNUSED) {
    222   UNIMPLEMENTED(FATAL);
    223 }
    224 
    225 void Assembler::CopyRawPtrFromThread64(FrameOffset fr_offs ATTRIBUTE_UNUSED,
    226                                        ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
    227                                        ManagedRegister scratch ATTRIBUTE_UNUSED) {
    228   UNIMPLEMENTED(FATAL);
    229 }
    230 
    231 void Assembler::CopyRawPtrToThread32(ThreadOffset<4> thr_offs ATTRIBUTE_UNUSED,
    232                                      FrameOffset fr_offs ATTRIBUTE_UNUSED,
    233                                      ManagedRegister scratch ATTRIBUTE_UNUSED) {
    234   UNIMPLEMENTED(FATAL);
    235 }
    236 
    237 void Assembler::CopyRawPtrToThread64(ThreadOffset<8> thr_offs ATTRIBUTE_UNUSED,
    238                                      FrameOffset fr_offs ATTRIBUTE_UNUSED,
    239                                      ManagedRegister scratch ATTRIBUTE_UNUSED) {
    240   UNIMPLEMENTED(FATAL);
    241 }
    242 
    243 void Assembler::CallFromThread32(ThreadOffset<4> offset ATTRIBUTE_UNUSED,
    244                                  ManagedRegister scratch ATTRIBUTE_UNUSED) {
    245   UNIMPLEMENTED(FATAL);
    246 }
    247 
    248 void Assembler::CallFromThread64(ThreadOffset<8> offset ATTRIBUTE_UNUSED,
    249                                  ManagedRegister scratch ATTRIBUTE_UNUSED) {
    250   UNIMPLEMENTED(FATAL);
    251 }
    252 
    253 }  // namespace art
    254