test/hotspot/gtest/runtime/test_signatureStream.cpp

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#include "precompiled.hpp"
#include "runtime/interfaceSupport.inline.hpp"
#include "classfile/symbolTable.hpp"
#include "runtime/signature.hpp"
#include "threadHelper.inline.hpp"
#include "unittest.hpp"

TEST_VM(SignatureStream, check_refcount) {

  JavaThread* THREAD = JavaThread::current();
  // the thread should be in vm to use locks
  ThreadInVMfromNative ThreadInVMfromNative(THREAD);
  // SignatureStream::as_symbol will allocate on the resource area
  ResourceMark rm(THREAD);

  Symbol* foo = SymbolTable::new_symbol("Foo");
  int r1 = foo->refcount();

  {
    // Trivial test: non-method signature of a non-permanent symbol
    Symbol* methodSig = SymbolTable::new_symbol("LFoo;");
    SignatureStream ss(methodSig, false);
    Symbol* sym = ss.as_symbol();
    ASSERT_EQ(sym, foo) << "found symbol should be Foo: " << sym->as_C_string();
    // This should mean the SS looks up and increments refcount to Foo
    ASSERT_EQ(foo->refcount(), r1 + 1) << "refcount should be incremented";

    ASSERT_TRUE(!ss.is_done())
      << "stream parsing should not be marked as done until"
      <<" ss.next() called after the last symbol";

    ss.next();
    ASSERT_TRUE(ss.is_done()) << "stream parsing should be marked as done";
  }

  ASSERT_EQ(foo->refcount(), r1) << "refcount should have decremented";

  {
    // Ensure refcount is properly decremented when first symbol is non-permanent and second isn't

    Symbol* integer = SymbolTable::new_symbol("java/lang/Integer");
    ASSERT_TRUE(integer->is_permanent()) << "java/lang/Integer must be permanent";

    Symbol* methodSig = SymbolTable::new_symbol("(LFoo;)Ljava/lang/Integer;");
    SignatureStream ss(methodSig);
    Symbol* sym = ss.as_symbol();
    ASSERT_EQ(sym, foo) << "found symbol should be Foo: " << sym->as_C_string();
    // This should mean the SS looks up and increments refcount to Foo
    ASSERT_EQ(foo->refcount(), r1 + 1) << "refcount should be incremented";

    ss.next();
    sym = ss.as_symbol();
    ASSERT_EQ(sym, integer) << "found symbol should be java/lang/Integer";

    ASSERT_TRUE(!ss.is_done())
      << "stream parsing should not be marked as done until"
      <<" ss.next() called after the last symbol";

    ss.next();
    ASSERT_TRUE(ss.is_done()) << "stream parsing should be marked as done";
  }

  ASSERT_EQ(foo->refcount(), r1) << "refcount should have decremented";

}