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---
pretty_name: "ComBack++"
language:
- code
pipeline_tag: Compiler Backend
tags:
- C++/TableGen/Machine Description Code
- Compiler Backend
license: "cc-by-4.0"
# configs:
# - config_name: Statement-Level Completion
# data_files :
# - split: train
# path: Code_Completion/statement_level/train*
# - split: validation
# path: Code_Completion/statement_level/valid*
# - split: test
# path: Code_Completion/statement_level/test*
# - config_name: Next-Statement Suggestion
# data_files :
# - split: train
# path: Code_Completion/next_statement/train*
# - split: validation
# path: Code_Completion/next_statement/valid*
# - split: test
# path: Code_Completion/next_statement/test*
# - config_name: Code Generation
# data_files :
# - split: train
# path: Code_Generation/train*
# - split: validation
# path: Code_Generation/valid*
# - split: test
# path: Code_Generation/test*
---
# ComBack++: A Multi-Language Dataset Providing End-to-End Support for Compiler Backend Development
ComBack++ is a large-scale, multi-platform and multi-language compiler backend code dataset. It is sourced from GCC and LLVM backends corresponding to 183 target platforms.
## Dataset Information
- Source Data
- GCC
| Category | Target Platform | C++ Function | C++ KLoC | Machine Description KLoC |
| ---- | ---- | ---- | ---- | ---- |
| CPU | 30 | 56,211 | 858.2 | 228.5 |
| MPU | 35 | 8,713 | 243.8 | 87.1 |
| GPU | 2 | 731 | 12.7 | 3.0 |
| VLIW | 5 | 1,323 | 32.8 | 17.8 |
| DSP | 4 | 542 | 17.2 | 6.1 |
| Virtual | 5 | 558 | 10.5 | 0.1 |
| **SUM** | **81** | **68,078** | **1175.2** | **342.6** |
- LLVM
| Category | Target Platform | C++ Function | C++ KLoC | TableGen KLoC |
| ---- | ---- | ---- | ---- | ---- |
| CPU | 43 | 97,972 | 3,768.4 | 1,157.7 |
| MPU | 30 | 12,552 | 190.7 | 24.8 |
| GPU | 5 | 28,267 | 886.8 | 168.5 |
| VLIW | 5 | 2,386 | 27.4 | 0.8 |
| DSP | 7 | 11,584 | 296.8 | 129.4 |
| Virtual | 12 | 10,538 | 199.4 | 12.9 |
| **SUM** | **102** | **163,299** | **5,369.5** | **1,494.1** |
- Tasks
- Statement-Level Completion: complete current statement.
```c++
//Inputs:
...
adjustReg(MBB,LastFrameDestroy, DL, SPReg, FPReg, -StackSize+RVFI->getVarArgsSaveSize()
//Ground Truth:
MachineInstr::FrameDestroy);
```
- Next-Statement Suggestion: predict the next statement.
```c++
//Inputs:
...
maxCallFrameSize = (maxCallFrameSize + AlignMask) & ~AlignMask;
//Ground Truth:
MFI -> setMaxCallFrameSize(maxCallFrameSize);
```
- Code Generation: generate a function template with function description in natrual language.
```c++
//Inputs:
getPointerRegClass: Returns a TargetRegisterClass used for pointer values.
//Ground Truth:
TargetRegisterClass *RegisterInfo::getPointerRegClass(MachineFunction &MF ,unsigned Kind) {
return Subtarget.is64Bit() ? <ISA_LIT> : <ISA_LIT>;
}
```
- Program Repair: automatically fixing bugs at identified locations.
```c++
//Inputs:
int64_t Imm; <BUGS> MCExpr::VariantKind VK; <BUGE> ...
//Ground Truth:
<FIXS> MCExpr::VariantKind VK = MCExpr::VK_None; <FIXE>
```
## Organization
- `./*.jsonl`: **Take data of RISC-V,ARC,NVPTX both in GCC and LLVM as test set, split train/valid set in the ratio of 90%:10% of other targets excluding RI5CY(RI5CY is custmoized based on RISCV)**
| Task | Programming Language | Train | Valid | Test |
|---------------------------- |---------------------- |------------------ |---------------- |--------------- |
| Statement-Level Completion | C++ | 149,368 (16.41M) | 16,480 (1.84M) | 7,897 (0.82M) |
| Statement-Level Completion | TableGen/MD | 120,460 (4.46M) | 13,295 (0.50M) | 7,090 (0.25M) |
| Next-Statement Suggestion | C++ | 137,155 (20.55M) | 15,218 (2.32M) | 8,109 (1.09M) |
| Next-Statement Suggestion | TableGen/MD | 124,528 (6.71M) | 14,009 (0.76M) | 2,726 (0.14M) |
| Code Generation | C++ | 37,805 (10.69M) | 4,137 (1.16M) | 2,944 (0.73M) |
| Program Repair | C++ | 40,578 (4.33M) | 4,539 (0.48M) | 2,623 (0.29M) |
| Program Repair | TableGen/MD | 25,983 (2.95M) | 2,975 (0.33M) | 1,814 (0.24M) | |