use strip dead code (ew) to resolve the memory usage issue

rome · Jun 14, 2023 · 08047c0 · 08047c0
1 parent e4d87d2
commit 08047c0
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Showing 4 changed files with 24 additions and 13 deletions.
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
@@ -102,14 +102,18 @@ path = "fuzz_targets/rome_format_tsx.rs"
 name = "rome_format_typescript"
 path = "fuzz_targets/rome_format_typescript.rs"
 
+# enabling debug seems to cause a massive use of RAM (>12GB)
 [profile.release]
-opt-level = 2
-debug = true
+opt-level = 3
+#debug = true
+debug = false
 
 [profile.dev]
-opt-level = 2
-debug = true
+opt-level = 3
+#debug = true
+debug = false
 
 [profile.test]
-opt-level = 2
-debug = true
+opt-level = 3
+#debug = true
+debug = false
diff --git a/fuzz/README.md b/fuzz/README.md
@@ -21,7 +21,7 @@ without it (very unlikely for the fuzzer to generate valid python code from "thi
 Once you have initialised the fuzzers, you can then execute any fuzzer with:
 
 ```bash
-cargo fuzz run -s none name_of_fuzzer -- -timeout=1
+cargo fuzz run --strip-dead-code -s none name_of_fuzzer -- -timeout=1
 ```
 
 **Users using Apple M1 devices must use a nightly compiler and omit the `-s none` portion of this
@@ -40,7 +40,7 @@ triggered with a smaller input.
 `cargo-fuzz` supports this out of the box with:
 
 ```bash
-cargo fuzz tmin -s none name_of_fuzzer artifacts/name_of_fuzzer/crash-...
+cargo fuzz tmin --strip-dead-code -s none name_of_fuzzer artifacts/name_of_fuzzer/crash-...
 ```
 
 From here, you will need to analyse the input and potentially the behaviour of the program.
@@ -116,4 +116,11 @@ preservation property of formatting.
 Of particular note: these fuzzers may have false negative results if e.g. two tokens are turned into
 one token and the reformatting result is the same.
 Unfortunately, we can't necessarily control for this because the formatter may reorganise the
-sequence of tokens.
+sequence of tokens.
+
+## Errata
+
+Unfortunately, `--strip-dead-code` is necessary to build the target with a suitable amount of
+memory.
+This seems to be caused by some issue in LLVM, but I haven't been able to spend the time to
+investigate this fully yet.
diff --git a/fuzz/init-fuzzer.sh b/fuzz/init-fuzzer.sh
@@ -24,7 +24,7 @@ if [ ! -d corpus/rome_format_all ]; then
   cp -r "../../../crates/rome_js_parser/test_data" .
   find . -name \*.rast -delete
   cd -
-  cargo fuzz cmin --features rome_all -s none rome_format_all
+  cargo fuzz cmin --strip-dead-code --features rome_all -s none rome_format_all
 fi
 
 if [ ! -d corpus/rome_format_json ]; then
@@ -33,7 +33,7 @@ if [ ! -d corpus/rome_format_json ]; then
   cp -r "../../../crates/rome_json_parser/tests/json_test_suite" .
   find . -name \*.rast -delete
   cd -
-  cargo fuzz cmin -s none rome_format_json
+  cargo fuzz cmin --strip-dead-code -s none rome_format_json
 fi
 
 echo "Done! You are ready to fuzz."
diff --git a/fuzz/reinit-fuzzer.sh b/fuzz/reinit-fuzzer.sh
@@ -10,13 +10,13 @@ cd corpus/rome_format_all
 cp -r "../../../crates/rome_js_parser/test_data" .
 find . -name \*.rast -delete
 cd -
-cargo fuzz cmin --features rome_all -s none rome_format_all
+cargo fuzz cmin --strip-dead-code --features rome_all -s none rome_format_all
 
 mkdir -p corpus/rome_format_json
 cd corpus/rome_format_json
 cp -r "../../../crates/rome_json_parser/tests/json_test_suite" .
 find . -name \*.rast -delete
 cd -
-cargo fuzz cmin -s none rome_format_json
+cargo fuzz cmin --strip-dead-code -s none rome_format_json
 
 echo "Done! You are ready to fuzz."