1 /*
2 * Copyright (C) 2023 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 "berberis/heavy_optimizer/riscv64/heavy_optimize_region.h"
18
19 #include <cstdint>
20 #include <tuple>
21
22 #include "berberis/assembler/machine_code.h"
23 #include "berberis/backend/x86_64/code_gen.h"
24 #include "berberis/backend/x86_64/machine_ir.h"
25 #include "berberis/base/arena_alloc.h"
26 #include "berberis/base/config_globals.h"
27 #include "berberis/base/tracing.h"
28 #include "berberis/decoder/riscv64/decoder.h"
29 #include "berberis/decoder/riscv64/semantics_player.h"
30 #include "berberis/guest_state/guest_addr.h"
31
32 #include "frontend.h"
33
34 namespace berberis {
35
HeavyOptimizeRegion(GuestAddr pc,MachineCode * machine_code,const HeavyOptimizeParams & params)36 std::tuple<GuestAddr, bool, size_t> HeavyOptimizeRegion(GuestAddr pc,
37 MachineCode* machine_code,
38 const HeavyOptimizeParams& params) {
39 Arena arena;
40 x86_64::MachineIR machine_ir(&arena);
41 HeavyOptimizerFrontend frontend(&machine_ir, pc);
42 SemanticsPlayer sem_player(&frontend);
43 Decoder decoder(&sem_player);
44 size_t number_of_instructions = 0;
45
46 while (number_of_instructions != params.max_number_of_instructions &&
47 !frontend.IsRegionEndReached()) {
48 frontend.StartInsn();
49 auto size = decoder.Decode(ToHostAddr<uint16_t>(frontend.GetInsnAddr()));
50 if (!frontend.success()) {
51 // Do not increment the insn counter if we could not generate the instruction.
52 break;
53 }
54 frontend.IncrementInsnAddr(size);
55 number_of_instructions++;
56 }
57
58 auto stop_pc = frontend.GetInsnAddr();
59 frontend.Finalize(stop_pc);
60
61 if (IsConfigFlagSet(kVerboseTranslation)) {
62 // Trace only after all the potential failure points.
63 TRACE("Heavy optimizing 0x%lx (%lu bytes)", pc, stop_pc - pc);
64 }
65
66 x86_64::GenCode(&machine_ir, machine_code);
67
68 return {stop_pc, frontend.success(), number_of_instructions};
69 }
70
71 } // namespace berberis
72