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 #include "arm/assembler_arm32.h"
     23 #include "arm/assembler_thumb2.h"
     24 #include "arm64/assembler_arm64.h"
     25 #include "mips/assembler_mips.h"
     26 #include "x86/assembler_x86.h"
     27 #include "x86_64/assembler_x86_64.h"
     28 #include "globals.h"
     29 #include "memory_region.h"
     30 
     31 namespace art {
     32 
     33 static byte* NewContents(size_t capacity) {
     34   return new byte[capacity];
     35 }
     36 
     37 
     38 AssemblerBuffer::AssemblerBuffer() {
     39   static const size_t kInitialBufferCapacity = 4 * KB;
     40   contents_ = NewContents(kInitialBufferCapacity);
     41   cursor_ = contents_;
     42   limit_ = ComputeLimit(contents_, kInitialBufferCapacity);
     43   fixup_ = NULL;
     44   slow_path_ = NULL;
     45 #ifndef NDEBUG
     46   has_ensured_capacity_ = false;
     47   fixups_processed_ = false;
     48 #endif
     49 
     50   // Verify internal state.
     51   CHECK_EQ(Capacity(), kInitialBufferCapacity);
     52   CHECK_EQ(Size(), 0U);
     53 }
     54 
     55 
     56 AssemblerBuffer::~AssemblerBuffer() {
     57   delete[] contents_;
     58 }
     59 
     60 
     61 void AssemblerBuffer::ProcessFixups(const MemoryRegion& region) {
     62   AssemblerFixup* fixup = fixup_;
     63   while (fixup != NULL) {
     64     fixup->Process(region, fixup->position());
     65     fixup = fixup->previous();
     66   }
     67 }
     68 
     69 
     70 void AssemblerBuffer::FinalizeInstructions(const MemoryRegion& instructions) {
     71   // Copy the instructions from the buffer.
     72   MemoryRegion from(reinterpret_cast<void*>(contents()), Size());
     73   instructions.CopyFrom(0, from);
     74   // Process fixups in the instructions.
     75   ProcessFixups(instructions);
     76 #ifndef NDEBUG
     77   fixups_processed_ = true;
     78 #endif
     79 }
     80 
     81 
     82 void AssemblerBuffer::ExtendCapacity() {
     83   size_t old_size = Size();
     84   size_t old_capacity = Capacity();
     85   size_t new_capacity = std::min(old_capacity * 2, old_capacity + 1 * MB);
     86 
     87   // Allocate the new data area and copy contents of the old one to it.
     88   byte* new_contents = NewContents(new_capacity);
     89   memmove(reinterpret_cast<void*>(new_contents),
     90           reinterpret_cast<void*>(contents_),
     91           old_size);
     92 
     93   // Compute the relocation delta and switch to the new contents area.
     94   ptrdiff_t delta = new_contents - contents_;
     95   contents_ = new_contents;
     96 
     97   // Update the cursor and recompute the limit.
     98   cursor_ += delta;
     99   limit_ = ComputeLimit(new_contents, new_capacity);
    100 
    101   // Verify internal state.
    102   CHECK_EQ(Capacity(), new_capacity);
    103   CHECK_EQ(Size(), old_size);
    104 }
    105 
    106 
    107 Assembler* Assembler::Create(InstructionSet instruction_set) {
    108   switch (instruction_set) {
    109     case kArm:
    110       return new arm::Arm32Assembler();
    111     case kThumb2:
    112       return new arm::Thumb2Assembler();
    113     case kArm64:
    114       return new arm64::Arm64Assembler();
    115     case kMips:
    116       return new mips::MipsAssembler();
    117     case kX86:
    118       return new x86::X86Assembler();
    119     case kX86_64:
    120       return new x86_64::X86_64Assembler();
    121     default:
    122       LOG(FATAL) << "Unknown InstructionSet: " << instruction_set;
    123       return NULL;
    124   }
    125 }
    126 
    127 void Assembler::StoreImmediateToThread32(ThreadOffset<4> dest, uint32_t imm,
    128                                          ManagedRegister scratch) {
    129   UNIMPLEMENTED(FATAL);
    130 }
    131 
    132 void Assembler::StoreImmediateToThread64(ThreadOffset<8> dest, uint32_t imm,
    133                                          ManagedRegister scratch) {
    134   UNIMPLEMENTED(FATAL);
    135 }
    136 
    137 void Assembler::StoreStackOffsetToThread32(ThreadOffset<4> thr_offs,
    138                                            FrameOffset fr_offs,
    139                                            ManagedRegister scratch) {
    140   UNIMPLEMENTED(FATAL);
    141 }
    142 
    143 void Assembler::StoreStackOffsetToThread64(ThreadOffset<8> thr_offs,
    144                                            FrameOffset fr_offs,
    145                                            ManagedRegister scratch) {
    146   UNIMPLEMENTED(FATAL);
    147 }
    148 
    149 void Assembler::StoreStackPointerToThread32(ThreadOffset<4> thr_offs) {
    150   UNIMPLEMENTED(FATAL);
    151 }
    152 
    153 void Assembler::StoreStackPointerToThread64(ThreadOffset<8> thr_offs) {
    154   UNIMPLEMENTED(FATAL);
    155 }
    156 
    157 void Assembler::LoadFromThread32(ManagedRegister dest, ThreadOffset<4> src, size_t size) {
    158   UNIMPLEMENTED(FATAL);
    159 }
    160 
    161 void Assembler::LoadFromThread64(ManagedRegister dest, ThreadOffset<8> src, size_t size) {
    162   UNIMPLEMENTED(FATAL);
    163 }
    164 
    165 void Assembler::LoadRawPtrFromThread32(ManagedRegister dest, ThreadOffset<4> offs) {
    166   UNIMPLEMENTED(FATAL);
    167 }
    168 
    169 void Assembler::LoadRawPtrFromThread64(ManagedRegister dest, ThreadOffset<8> offs) {
    170   UNIMPLEMENTED(FATAL);
    171 }
    172 
    173 void Assembler::CopyRawPtrFromThread32(FrameOffset fr_offs, ThreadOffset<4> thr_offs,
    174                                        ManagedRegister scratch) {
    175   UNIMPLEMENTED(FATAL);
    176 }
    177 
    178 void Assembler::CopyRawPtrFromThread64(FrameOffset fr_offs, ThreadOffset<8> thr_offs,
    179                                        ManagedRegister scratch) {
    180   UNIMPLEMENTED(FATAL);
    181 }
    182 
    183 void Assembler::CopyRawPtrToThread32(ThreadOffset<4> thr_offs, FrameOffset fr_offs,
    184                                      ManagedRegister scratch) {
    185   UNIMPLEMENTED(FATAL);
    186 }
    187 
    188 void Assembler::CopyRawPtrToThread64(ThreadOffset<8> thr_offs, FrameOffset fr_offs,
    189                                      ManagedRegister scratch) {
    190   UNIMPLEMENTED(FATAL);
    191 }
    192 
    193 void Assembler::CallFromThread32(ThreadOffset<4> offset, ManagedRegister scratch) {
    194   UNIMPLEMENTED(FATAL);
    195 }
    196 
    197 void Assembler::CallFromThread64(ThreadOffset<8> offset, ManagedRegister scratch) {
    198   UNIMPLEMENTED(FATAL);
    199 }
    200 
    201 }  // namespace art
    202