(1) define *_OFFSET in RegisterInfoPOSIX_loongarch64.cpp
(2) remove the alias u0 for r21, use fp and s9 for r22

(1) Put elf.h before sys/uio.h
(2) Remove unnecessary indent
(3) Remove const cast of data_sp->GetBytes()
(4) Return k_num_register_sets in GetRegisterSetCount()
(5) Add register name alias

Use "break 0x5" in the code comment.

c++: fatal error: Killed signal terminated program cc1plus due to out of memory
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107483

(1) Rename LOONGARCHSubType to LoongArchSubType
(2) Define min_opcode_byte_size as 4 for LoongArch

In D137057#3895926, @DavidSpickett wrote:

Looks good to me.

Thank you for your patch.
It seems there is a new problem with this patch.

I can reproduce this issue on x86_64 used with the latest gcc.

In D136362#3890970, @DavidSpickett wrote:

Can you give us:

• the full cmake command you used to configure the project

In D136362#3888328, @Emmmer wrote:

In D136362#3887927, @seehearfeel wrote:

After commit 05ae747a5353811f93f5814f24d2335e6229d78a ("[LLDB][RISCV] Add RV64C instruction support for EmulateInstructionRISCV"),
build failed when "ninja check-lldb" on my local machine:

[1/3] Building CXX object tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o
FAILED: tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o 
/usr/bin/c++ -DGTEST_HAS_RTTI=0 -DHAVE_ROUND -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/loongson/llvm-project/llvm/build/tools/lldb/unittests/Instruction -I/home/loongson/llvm-project/lldb/unittests/Instruction -I/home/loongson/llvm-project/lldb/include -I/home/loongson/llvm-project/llvm/build/tools/lldb/include -I/home/loongson/llvm-project/llvm/build/include -I/home/loongson/llvm-project/llvm/include -I/home/loongson/llvm-project/llvm/../clang/include -I/home/loongson/llvm-project/llvm/build/tools/lldb/../clang/include -I/home/loongson/llvm-project/lldb/source -I/home/loongson/llvm-project/lldb/unittests -I/home/loongson/llvm-project/llvm/utils/unittest/googletest/include -I/home/loongson/llvm-project/llvm/utils/unittest/googlemock/include -isystem /usr/include/libxml2 -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-stringop-truncation -O3 -DNDEBUG  -include /home/loongson/llvm-project/lldb/unittests/gtest_common.h -Wno-variadic-macros -fno-exceptions -fno-rtti -Wno-suggest-override -std=c++17 -MD -MT tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o -MF tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o.d -o tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o -c /home/loongson/llvm-project/lldb/unittests/Instruction/RISCV/TestRISCVEmulator.cpp
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
ninja: build stopped: subcommand failed.

After revert the changes in lldb/unittests/Instruction/RISCV/TestRISCVEmulator.cpp, build successful.

I failed to repro this error. :(

c++: fatal error: Killed signal terminated program cc1plus

With such a vague error message it is hard to find the problematic part and it does not look like a code problem. Would you mind checking your build configuration and trying ninja check-lldb -j1 for detailed information?

After commit 05ae747a5353811f93f5814f24d2335e6229d78a ("[LLDB][RISCV] Add RV64C instruction support for EmulateInstructionRISCV"),
build failed when "ninja check-lldb" on my local machine:

[1/3] Building CXX object tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o
FAILED: tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o 
/usr/bin/c++ -DGTEST_HAS_RTTI=0 -DHAVE_ROUND -D_GNU_SOURCE -D__STDC_CONSTANT_MACROS -D__STDC_FORMAT_MACROS -D__STDC_LIMIT_MACROS -I/home/loongson/llvm-project/llvm/build/tools/lldb/unittests/Instruction -I/home/loongson/llvm-project/lldb/unittests/Instruction -I/home/loongson/llvm-project/lldb/include -I/home/loongson/llvm-project/llvm/build/tools/lldb/include -I/home/loongson/llvm-project/llvm/build/include -I/home/loongson/llvm-project/llvm/include -I/home/loongson/llvm-project/llvm/../clang/include -I/home/loongson/llvm-project/llvm/build/tools/lldb/../clang/include -I/home/loongson/llvm-project/lldb/source -I/home/loongson/llvm-project/lldb/unittests -I/home/loongson/llvm-project/llvm/utils/unittest/googletest/include -I/home/loongson/llvm-project/llvm/utils/unittest/googlemock/include -isystem /usr/include/libxml2 -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-maybe-uninitialized -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -Wno-deprecated-declarations -Wno-unknown-pragmas -Wno-strict-aliasing -Wno-stringop-truncation -O3 -DNDEBUG  -include /home/loongson/llvm-project/lldb/unittests/gtest_common.h -Wno-variadic-macros -fno-exceptions -fno-rtti -Wno-suggest-override -std=c++17 -MD -MT tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o -MF tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o.d -o tools/lldb/unittests/Instruction/CMakeFiles/EmulatorTests.dir/RISCV/TestRISCVEmulator.cpp.o -c /home/loongson/llvm-project/lldb/unittests/Instruction/RISCV/TestRISCVEmulator.cpp
c++: fatal error: Killed signal terminated program cc1plus
compilation terminated.
ninja: build stopped: subcommand failed.

In D136578#3881955, @DavidSpickett wrote:

This LGTM from the lldb side.

Remove GPRegSet and FPRegSet definitions which are not used in this commit.
Use git clang-format to format the patch properly.

In D136578#3878476, @xen0n wrote:

Hi, I've edited the summary and patch title for you. It's generally not necessary to add that much "politeness" when most of it is obvious from context (e.g. the fact that you're new face here, that there's obviously no LoongArch support in LLDB, and most of the methods being stubs). It didn't help that much of the text was in Chinglish either.

As for the changes, they look reasonable to me, but as I haven't tested it out myself yet (and unable to, due to it being stub-only), I'll not give the approval myself this time. Thanks for your contribution and welcome!

Use git diff -U999999 to generate the patch so that we can get more context suggested by Weining.