Shorten the generated code with ./release-rs.sh --features short

.cargo/x86_64-unknown-linux-gnu-short.json

@@ -0,0 +1,50 @@
+{
+  "arch": "x86_64",
+  "cpu": "x86-64",
+  "crt-objects-fallback": "false",
+  "crt-static-respected": true,
+  "data-layout": "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128",
+  "dynamic-linking": true,
+  "eh-frame-header": false,
+  "env": "gnu",
+  "has-rpath": true,
+  "has-thread-local": true,
+  "is-builtin": false,
+  "linker-flavor": "gnu-cc",
+  "llvm-target": "x86_64-unknown-linux-gnu",
+  "max-atomic-width": 64,
+  "os": "linux",
+  "plt-by-default": false,
+  "position-independent-executables": true,
+  "pre-link-args": {
+    "gnu-cc": [
+      "-m64"
+    ],
+    "gnu-lld-cc": [
+      "-m64"
+    ]
+  },
+  "relro-level": "off",
+  "stack-probes": {
+    "kind": "none"
+  },
+  "static-position-independent-executables": true,
+  "supported-sanitizers": [
+    "address",
+    "cfi",
+    "leak",
+    "memory",
+    "thread",
+    "safestack"
+  ],
+  "supported-split-debuginfo": [
+    "packed",
+    "unpacked",
+    "off"
+  ],
+  "supports-xray": true,
+  "target-family": [
+    "unix"
+  ],
+  "target-pointer-width": "64"
+}

.github/workflows/build-linux.yml

@@ -28,7 +28,7 @@ jobs:
         with:
           toolchain: nightly
           target: ${{ matrix.target }}
-          profile: minimal
+          profile: default
           override: true
           components: clippy
       - name: Install node.js
@@ -39,6 +39,7 @@ jobs:
         run: |
           sudo apt update
           sudo apt install gcc-multilib nasm
+          rustup component add rust-src --toolchain nightly-x86_64-unknown-linux-gnu
       - name: Clippy
         run: cargo clippy
         env:
@@ -53,15 +54,27 @@ jobs:
         run: |
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./src/solution.rs ./tests/boj_1000.in ./tests/boj_1000.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./tests/boj_1001.rs ./tests/boj_1001.in ./tests/boj_1001.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./tests/boj_2587.rs ./tests/boj_2587.in ./tests/boj_2587.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./tests/boj_2751.rs ./tests/boj_2751.in.zip ./tests/boj_2751.out.zip
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./tests/boj_3745.rs ./tests/boj_3745.in ./tests/boj_3745.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./tests/boj_14939.rs ./tests/boj_14939.in ./tests/boj_14939.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release.sh C 64 ./tests/reloc.rs ./tests/reloc.in ./tests/reloc.out
+      - name: Check C (x86_64) - short
+        if: ${{ matrix.target == 'x86_64-unknown-linux-gnu' }}
+        run: |
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./src/solution.rs ./tests/boj_1000.in ./tests/boj_1000.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./tests/boj_1001.rs ./tests/boj_1001.in ./tests/boj_1001.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./tests/boj_2587.rs ./tests/boj_2587.in ./tests/boj_2587.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./tests/boj_2751.rs ./tests/boj_2751.in.zip ./tests/boj_2751.out.zip
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./tests/boj_3745.rs ./tests/boj_3745.in ./tests/boj_3745.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./tests/boj_14939.rs ./tests/boj_14939.in ./tests/boj_14939.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-short.sh C 64 ./tests/reloc.rs ./tests/reloc.in ./tests/reloc.out
       - name: Check C (x86)
         if: ${{ matrix.target == 'i686-unknown-linux-gnu' }}
         run: |
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-32bit.sh C 32 ./src/solution.rs ./tests/boj_1000.in ./tests/boj_1000.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-32bit.sh C 32 ./tests/boj_1001.rs ./tests/boj_1001.in ./tests/boj_1001.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-32bit.sh C 32 ./tests/boj_2587.rs ./tests/boj_2587.in ./tests/boj_2587.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-32bit.sh C 32 ./tests/boj_2751.rs ./tests/boj_2751.in.zip ./tests/boj_2751.out.zip
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-32bit.sh C 32 ./tests/boj_3745.rs ./tests/boj_3745.in ./tests/boj_3745.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-32bit.sh C 32 ./tests/boj_14939.rs ./tests/boj_14939.in ./tests/boj_14939.out
@@ -71,15 +84,27 @@ jobs:
         run: |
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./src/solution.rs ./tests/boj_1000.in ./tests/boj_1000.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./tests/boj_1001.rs ./tests/boj_1001.in ./tests/boj_1001.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./tests/boj_2587.rs ./tests/boj_2587.in ./tests/boj_2587.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./tests/boj_2751.rs ./tests/boj_2751.in.zip ./tests/boj_2751.out.zip
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./tests/boj_3745.rs ./tests/boj_3745.in ./tests/boj_3745.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./tests/boj_14939.rs ./tests/boj_14939.in ./tests/boj_14939.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-rs.sh Rust 64 ./tests/reloc.rs ./tests/reloc.in ./tests/reloc.out
+      - name: Check Rust (x86_64) - short
+        if: ${{ matrix.target == 'x86_64-unknown-linux-gnu' }}
+        run: |
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./src/solution.rs ./tests/boj_1000.in ./tests/boj_1000.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./tests/boj_1001.rs ./tests/boj_1001.in ./tests/boj_1001.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./tests/boj_2587.rs ./tests/boj_2587.in ./tests/boj_2587.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./tests/boj_2751.rs ./tests/boj_2751.in.zip ./tests/boj_2751.out.zip
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./tests/boj_3745.rs ./tests/boj_3745.in ./tests/boj_3745.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./tests/boj_14939.rs ./tests/boj_14939.in ./tests/boj_14939.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./.github/workflows/release-rs-short.sh Rust 64 ./tests/reloc.rs ./tests/reloc.in ./tests/reloc.out
       - name: Check wasm32
         if: ${{ matrix.target == 'wasm32-unknown-unknown' }}
         run: |
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-wasm32.sh JavaScript 32 ./src/solution.rs ./tests/boj_1000.in ./tests/boj_1000.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-wasm32.sh JavaScript 32 ./tests/boj_1001.rs ./tests/boj_1001.in ./tests/boj_1001.out
+          python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-wasm32.sh JavaScript 32 ./tests/boj_2587.rs ./tests/boj_2587.in ./tests/boj_2587.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-wasm32.sh JavaScript 32 ./tests/boj_2751.rs ./tests/boj_2751.in.zip ./tests/boj_2751.out.zip
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-wasm32.sh JavaScript 32 ./tests/boj_3745.rs ./tests/boj_3745.in ./tests/boj_3745.out
           python ./scripts/build-and-judge.py ${{ runner.temp }} ./release-wasm32.sh JavaScript 32 ./tests/boj_14939.rs ./tests/boj_14939.in ./tests/boj_14939.out

.github/workflows/build-windows.yml

@@ -55,6 +55,7 @@ jobs:
         run: |
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows.cmd C 64 .\src\solution.rs .\tests\boj_1000.in .\tests\boj_1000.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows.cmd C 64 .\tests\boj_1001.rs .\tests\boj_1001.in .\tests\boj_1001.out
+          python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows.cmd C 64 .\tests\boj_2587.rs .\tests\boj_2587.in .\tests\boj_2587.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows.cmd C 64 .\tests\boj_2751.rs .\tests\boj_2751.in.zip .\tests\boj_2751.out.zip
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows.cmd C 64 .\tests\boj_3745.rs .\tests\boj_3745.in .\tests\boj_3745.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows.cmd C 64 .\tests\boj_14939.rs .\tests\boj_14939.in .\tests\boj_14939.out
@@ -64,6 +65,7 @@ jobs:
         run: |
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows-rs.cmd Rust 64 .\src\solution.rs .\tests\boj_1000.in .\tests\boj_1000.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows-rs.cmd Rust 64 .\tests\boj_1001.rs .\tests\boj_1001.in .\tests\boj_1001.out
+          python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows-rs.cmd Rust 64 .\tests\boj_2587.rs .\tests\boj_2587.in .\tests\boj_2587.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows-rs.cmd Rust 64 .\tests\boj_2751.rs .\tests\boj_2751.in.zip .\tests\boj_2751.out.zip
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows-rs.cmd Rust 64 .\tests\boj_3745.rs .\tests\boj_3745.in .\tests\boj_3745.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-64bit-windows-rs.cmd Rust 64 .\tests\boj_14939.rs .\tests\boj_14939.in .\tests\boj_14939.out
@@ -73,6 +75,7 @@ jobs:
         run: |
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-wasm32.cmd JavaScript 32 .\src\solution.rs .\tests\boj_1000.in .\tests\boj_1000.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-wasm32.cmd JavaScript 32 .\tests\boj_1001.rs .\tests\boj_1001.in .\tests\boj_1001.out
+          python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-wasm32.cmd JavaScript 32 .\tests\boj_2587.rs .\tests\boj_2587.in .\tests\boj_2587.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-wasm32.cmd JavaScript 32 .\tests\boj_2751.rs .\tests\boj_2751.in.zip .\tests\boj_2751.out.zip
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-wasm32.cmd JavaScript 32 .\tests\boj_3745.rs .\tests\boj_3745.in .\tests\boj_3745.out
           python .\scripts\build-and-judge.py ${{ runner.temp }} .\release-wasm32.cmd JavaScript 32 .\tests\boj_14939.rs .\tests\boj_14939.in .\tests\boj_14939.out

.github/workflows/release-rs-short.sh

@@ -0,0 +1 @@
+./release-rs.sh --features short

.github/workflows/release-short.sh

@@ -0,0 +1 @@
+./release.sh --features short

.vscode/tasks.json

@@ -27,6 +27,14 @@
                 "$rustc"
             ],
         },
+        {
+            "label": "build-release-amd64-short-submit",
+            "type": "shell",
+            "command": "mkdir -p ./target/x86_64-unknown-linux-gnu-short/release; ./release.sh --features short > ./target/x86_64-unknown-linux-gnu-short/release/loader.c; code --reuse-window ./target/x86_64-unknown-linux-gnu-short/release/loader.c",
+            "problemMatcher": [
+                "$rustc"
+            ],
+        },
         {
             "label": "build-release-amd64-rs-submit",
             "type": "shell",
@@ -35,6 +43,14 @@
                 "$rustc"
             ],
         },
+        {
+            "label": "build-release-amd64-rs-short-submit",
+            "type": "shell",
+            "command": "mkdir -p ./target/x86_64-unknown-linux-gnu-short/release; ./release-rs.sh --features short > ./target/x86_64-unknown-linux-gnu-short/release/loader.rs; code --reuse-window ./target/x86_64-unknown-linux-gnu-short/release/loader.rs",
+            "problemMatcher": [
+                "$rustc"
+            ],
+        },
         {
             "label": "build-release-i686-submit",
             "type": "shell",

Cargo.toml

@@ -24,10 +24,21 @@ bench = false
 path = "src/bin/basm-submit.rs"
 
 [dependencies]
-compiler_builtins = { version = "0.1.101", features = ["mem"] }
 libm = "0.2.7"
 ryu = "1.0"
 
+[target.x86_64-pc-windows-msvc.dependencies]
+compiler_builtins = { version = "0.1.103", features = ["mem"] }
+[target.x86_64-unknown-linux-gnu.dependencies]
+compiler_builtins = { version = "0.1.103", features = ["mem"] }
+[target.i686-unknown-linux-gnu.dependencies]
+compiler_builtins = { version = "0.1.103", features = ["mem"] }
+[target.wasm32-unknown-unknown.dependencies]
+compiler_builtins = { version = "0.1.103", features = ["mem"] }
+
+[features]
+short = []
+
 [profile.dev]
 panic = "abort"
 

build.rs

@@ -18,7 +18,7 @@ fn main() {
             link_args_basm.push("/EMITPOGOPHASEINFO");
             link_args_basm_submit.push("/ALIGN:128");
         },
-        "x86_64-unknown-linux-gnu" | "i686-unknown-linux-gnu" => {
+        "x86_64-unknown-linux-gnu" | "x86_64-unknown-linux-gnu-short" | "i686-unknown-linux-gnu" => {
             link_args_basm.push("-nostartfiles");
             link_args_basm.push("-nostdlib");
             link_args_basm.push("-static-pie");
@@ -27,12 +27,12 @@ fn main() {
             link_args_basm.push("-fno-unwind-tables");
             link_args_basm.push("-fno-stack-protector");
             link_args_basm.push("-fno-plt");
-            if target == "x86_64-unknown-linux-gnu" {
-                link_args_basm.push("-Wl,--build-id=none,--gc-sections,--no-eh-frame-hdr,-z,norelro");
-            } else {
+            if target == "i686-unknown-linux-gnu" {
                 // Prevent linker from putting data into text, which is non-writable and hence not relocatable.
                 // This prevents the hack for getting the _DYNAMIC symbol in the entrypoint.
                 link_args_basm.push("-Wl,--build-id=none,--gc-sections,--no-eh-frame-hdr,-z,norelro,-z,notext");
+            } else {
+                link_args_basm.push("-Wl,--build-id=none,--gc-sections,--no-eh-frame-hdr,-z,norelro");
             }
             link_args_basm_submit.push("-Wl,-z,max-page-size=128");
         },

release-html.sh

@@ -1,3 +1,3 @@
 >&2 echo "Building project for target wasm32-unknown-unknown, language JavaScript, build mode Release"
 cargo +nightly build --target wasm32-unknown-unknown --bin=basm-submit --release "$@"
-python scripts/wasm-gen.py scripts/wasm-template.html
+python3 scripts/wasm-gen.py scripts/wasm-template.html

release-wasm32.sh

@@ -1,3 +1,3 @@
 >&2 echo "Building project for target wasm32-unknown-unknown, language JavaScript, build mode Release"
 cargo +nightly build --target wasm32-unknown-unknown --bin=basm-submit --release "$@"
-python scripts/wasm-gen.py scripts/wasm-template.js
+python3 scripts/wasm-gen.py scripts/wasm-template.js

scripts/base91.py

@@ -1,4 +1,29 @@
-def encode(x):
+def encode(x_in, use_rle=False):
+    sharp_insertion_points = []
+    if use_rle:
+        current_bits, current_bytes, i = 0, 0, 0
+        x = bytearray()
+        while i < len(x_in):
+            current_bits += 13
+            while current_bytes < current_bits // 8:
+                if i >= len(x_in):
+                    break
+                x.append(x_in[i])
+                current_bytes += 1
+                i += 1
+            if len(x) > 0 and x[-1] == 0:
+                zeros_cnt = 1
+                while i - 1 + zeros_cnt < len(x_in) and zeros_cnt < 256 and x_in[i - 1 + zeros_cnt] == 0:
+                    zeros_cnt += 1
+                if zeros_cnt >= 2:
+                    x.pop()
+                    x.append(zeros_cnt - 1)
+                    sharp_insertion_points.append((current_bits // 13 * 2) + len(sharp_insertion_points))
+                    i += zeros_cnt - 1
+        sharp_insertion_points = list(reversed(sharp_insertion_points))
+    else:
+        x = x_in
+
     out = []
     i = 0
     cnt5, stack5 = 0, []
@@ -21,11 +46,14 @@ def encode(x):
                 if bits < 13:
                     stack5.append((pos, bits))
             cnt5 -= 8
-    ret = bytearray(2 * len(out) + 1)
-    for i in range(len(out)):
-        ret[2 * i + 0] = 0x24 + (out[i] % 91)
-        ret[2 * i + 1] = 0x24 + (out[i] // 91)
-    ret[-1] = ord('!')
+    ret = bytearray()
+    for pack in out:
+        ret.append(0x24 + (pack % 91))
+        ret.append(0x24 + (pack // 91))
+        if len(sharp_insertion_points) > 0 and len(ret) == sharp_insertion_points[-1]:
+            ret.append(ord(b'#'))
+            sharp_insertion_points.pop()
+    ret.append(ord(b'!'))
     return bytes(ret)
 
 if __name__ == '__main__':

scripts/static-pie-elf2bin.py

@@ -160,7 +160,28 @@ def load_elf64(elf):
             continue        # since bytearray is zero-initialized
 
         dst_off, src_off, cnt = sh_dict['sh_addr'], sh_dict['sh_offset'], sh_dict['sh_size']
-        memory_bin[dst_off:dst_off+cnt] = elf[src_off:src_off+cnt]
+        blob = elf[src_off:src_off+cnt]
+
+        if sh_dict['sh_type'] == SHT_DYNAMIC:
+            # Trim the DYNAMIC section, leaving only relocation-related entries
+            # 16 == sizeof(Elf64_Dyn)
+            dst = 0 
+            for src in range(0, len(blob), 16):
+                # Included entries:
+                #   DT_PLTRELSZ = 2, DT_RELA = 7, DT_RELASZ = 8, DT_RELAENT = 9,
+                #   DT_REL = 17, DT_RELSZ = 18, DT_RELENT = 19, DT_PLTREL = 20,
+                #   DT_TEXT_REL = 22, DT_JMPREL = 23.
+                #
+                # Note: DT_RELACOUNT = 0x6fff_fff9 and DT_RELCOUNT = 0x6fff_fffa
+                #   are not included since they are redundant since
+                #   DT_RELACOUNT = DT_RELASZ/DT_RELAENT and
+                #   DT_RELCOUNT = DT_RELSZ/DT_RELENT.
+                if b2i(blob[src:src+8]) in [2, 7, 8, 9, 17, 18, 19, 20, 22, 23]:
+                    blob[dst:dst+16] = blob[src:src+16]
+                    dst += 16
+            blob[dst:] = bytearray(len(blob[dst:])) # fill remaining part with zeros
+
+        memory_bin[dst_off:dst_off+cnt] = blob
 
     entrypoint_offset = b2i(elf[24:32])
     return memory_bin, pos_begin, entrypoint_offset