1 files changed, 22 insertions, 0 deletions
diff --git a/compiler/compiler.cc b/compiler/compiler.cc
index 36213ca417..744bafa0fe 100644
--- a/compiler/compiler.cc
+++ b/compiler/compiler.cc
@@ -79,4 +79,26 @@ Compiler* Compiler::Create(CompilerDriver* driver, Compiler::Kind kind) {
   }
 }
 
+bool Compiler::IsPathologicalCase(const DexFile::CodeItem& code_item,
+                                  uint32_t method_idx,
+                                  const DexFile& dex_file) {
+  /*
+   * Skip compilation for pathologically large methods - either by instruction count or num vregs.
+   * Dalvik uses 16-bit uints for instruction and register counts.  We'll limit to a quarter
+   * of that, which also guarantees we cannot overflow our 16-bit internal Quick SSA name space.
+   */
+  if (code_item.insns_size_in_code_units_ >= UINT16_MAX / 4) {
+    LOG(INFO) << "Method exceeds compiler instruction limit: "
+              << code_item.insns_size_in_code_units_
+              << " in " << PrettyMethod(method_idx, dex_file);
+    return true;
+  }
+  if (code_item.registers_size_ >= UINT16_MAX / 4) {
+    LOG(INFO) << "Method exceeds compiler virtual register limit: "
+              << code_item.registers_size_ << " in " << PrettyMethod(method_idx, dex_file);
+    return true;
+  }
+  return false;
+}
+
 }  // namespace art