re PR java/1208 (Gcj can't compile a class file it generates.)

e
	* verify.c (verify_jvm_instructions):  Replace 3 pop_type by POP_TYPE
	macro for better error pin-pointing.
	* java-tree.h:  Fix typo in comment.

	* jcf-write.c (generate_bytecode_insns):  Changes to TRY_FINALLY_EXPR.
	Don't include jsr/goto in exception range.
	Check if start and end of exception range are the same (also TRY_EXPR).
	Don't emit jsr after try_block if CAN_COMPLETE_NORMALLY is false.
	However, do emit the following goto even if try_block is empty.
	Defer freeing exception_decl until after the finalizer, to make
	sure the local isn't reused in the finalizer.  Fixes PR java/1208.

	* parse.y (java_complete_lhs):  If the try-clause is empty, just
	return the finally-clause and vice versa.

From-SVN: r40801

gcc/java/ChangeLog

+2001-03-23  Per Bothner  <per@bothner.com>
+
+	* verify.c (verify_jvm_instructions):  Replace 3 pop_type by POP_TYPE
+	macro for better error pin-pointing.
+	* java-tree.h:  Fix typo in comment.
+
+	* jcf-write.c (generate_bytecode_insns):  Changes to TRY_FINALLY_EXPR.
+	Don't include jsr/goto in exception range.
+	Check if start and end of exception range are the same (also TRY_EXPR).
+	Don't emit jsr after try_block if CAN_COMPLETE_NORMALLY is false.
+	However, do emit the following goto even if try_block is empty.
+	Defer freeing exception_decl until after the finalizer, to make
+	sure the local isn't reused in the finalizer.  Fixes PR java/1208.
+
+	* parse.y (java_complete_lhs):  If the try-clause is empty, just
+	return the finally-clause and vice versa.
+
 2001-03-23  Alexandre Petit-Bianco  <apbianco@redhat.com>
 
 	* gcj.texi (Input Options): documented the check for attribute

gcc/java/java-tree.h

@@ -743,7 +743,7 @@ struct lang_identifier
 #define LABEL_RETURN_TYPE_STATE(NODE) LABEL_TYPE_STATE (LABEL_RETURN_LABEL (NODE))
 
 /* In a TREE_VEC for a LABEL_RETURN_TYPE_STATE, notes that
-   TREE_VEC_LENGTH has been adjust to the correct stack size. */
+   TREE_VEC_LENGTH has been adjusted to the correct stack size. */
 #define RETURN_MAP_ADJUSTED(NODE) TREE_LANG_FLAG_2(NODE)
 
 /* In the label of a sub-routine, a chain of the return location labels. */

gcc/java/jcf-write.c

@@ -111,7 +111,7 @@ struct chunk
 struct jcf_block
 {
   /* For blocks that that are defined, the next block (in pc order).
-     For blocks that are the not-yet-defined end label of a LABELED_BLOCK_EXPR
+     For blocks that are not-yet-defined the end label of a LABELED_BLOCK_EXPR
      or a cleanup expression (from a WITH_CLEANUP_EXPR),
      this is the next (outer) such end label, in a stack headed by
      labeled_blocks in jcf_partial. */
@@ -131,8 +131,8 @@ struct jcf_block
 
   int linenumber;
 
-  /* After finish_jcf_block is called, The actual instructions
-     contained in this block.  Before than NULL, and the instructions
+  /* After finish_jcf_block is called, the actual instructions
+     contained in this block.  Before that NULL, and the instructions
      are in state->bytecode. */
   union {
     struct chunk *chunk;
@@ -2311,6 +2311,8 @@ generate_bytecode_insns (exp, target, state)
 	  abort ();
 	generate_bytecode_insns (try_clause, IGNORE_TARGET, state);
 	end_label = get_jcf_label_here (state);
+	if (end_label == start_label)
+	  break;
 	if (CAN_COMPLETE_NORMALLY (try_clause))
 	  emit_goto (finished_label, state);
 	while (clause != NULL_TREE)
@@ -2332,61 +2334,53 @@ generate_bytecode_insns (exp, target, state)
       break;
     case TRY_FINALLY_EXPR:
       {
-	struct jcf_block *finished_label, *finally_label, *start_label;
+	struct jcf_block *finished_label,
+	  *finally_label, *start_label, *end_label;
 	struct jcf_handler *handler;
-	int worthwhile_finally = 1;
 	tree try_block = TREE_OPERAND (exp, 0);
 	tree finally = TREE_OPERAND (exp, 1);
-	tree return_link, exception_decl;
+	tree return_link = NULL_TREE, exception_decl = NULL_TREE;
 
-	finally_label = start_label = NULL;
-	return_link = exception_decl = NULL_TREE;
-	finished_label = gen_jcf_label (state);
+	tree exception_type;
 
-	/* If the finally clause happens to be empty, set a flag so we
-           remember to just skip it. */
-	if (BLOCK_EXPR_BODY (finally) == empty_stmt_node)
-	  worthwhile_finally = 0;
+	finally_label = gen_jcf_label (state);
+	start_label = get_jcf_label_here (state);
+	finally_label->pc = PENDING_CLEANUP_PC;
+	finally_label->next = state->labeled_blocks;
+	state->labeled_blocks = finally_label;
+	state->num_finalizers++;
+
+	generate_bytecode_insns (try_block, target, state);
+	if (state->labeled_blocks != finally_label)
+	  abort();
+	state->labeled_blocks = finally_label->next;
+	end_label = get_jcf_label_here (state);
 
-	if (worthwhile_finally)
+	if (end_label == start_label)
 	  {
-	    tree exception_type;
-	    return_link = build_decl (VAR_DECL, NULL_TREE,
-				      return_address_type_node);
-	    exception_type = build_pointer_type (throwable_type_node);
-	    exception_decl = build_decl (VAR_DECL, NULL_TREE, exception_type);
-
-	    finally_label = gen_jcf_label (state);
-	    start_label = get_jcf_label_here (state);
-	    finally_label->pc = PENDING_CLEANUP_PC;
-	    finally_label->next = state->labeled_blocks;
-	    state->labeled_blocks = finally_label;
-	    state->num_finalizers++;
+	    state->num_finalizers--;
+	    define_jcf_label (finally_label, state);
+	    generate_bytecode_insns (finally, IGNORE_TARGET, state);
+	    break;
 	  }
 
-	generate_bytecode_insns (try_block, target, state);
+	return_link = build_decl (VAR_DECL, NULL_TREE,
+				  return_address_type_node);
+	finished_label = gen_jcf_label (state);
 
-	if (worthwhile_finally)
+
+	if (CAN_COMPLETE_NORMALLY (try_block))
 	  {
-	    if (state->labeled_blocks != finally_label)
-	      abort();
-	    state->labeled_blocks = finally_label->next;
 	    emit_jsr (finally_label, state);
+	    emit_goto (finished_label, state);
 	  }
 
-	if (CAN_COMPLETE_NORMALLY (try_block)
-	    && TREE_CODE (try_block) == BLOCK
-	    && BLOCK_EXPR_BODY (try_block) != empty_stmt_node)
-	  emit_goto (finished_label, state);
-
 	/* Handle exceptions. */
 
-	if (!worthwhile_finally)
-	  break;
-
+	exception_type = build_pointer_type (throwable_type_node);
+	exception_decl = build_decl (VAR_DECL, NULL_TREE, exception_type);
 	localvar_alloc (return_link, state);
-	handler = alloc_handler (start_label, NULL_PTR, state);
-	handler->end_label = handler->handler_label;
+	handler = alloc_handler (start_label, end_label, state);
 	handler->type = NULL_TREE;
 	localvar_alloc (exception_decl, state);
 	NOTE_PUSH (1);
@@ -2396,7 +2390,6 @@ generate_bytecode_insns (exp, target, state)
 	RESERVE (1);
 	OP1 (OPCODE_athrow);
 	NOTE_POP (1);
-	localvar_free (exception_decl, state);
 
 	/* The finally block.  First save return PC into return_link. */
 	define_jcf_label (finally_label, state);
@@ -2405,6 +2398,7 @@ generate_bytecode_insns (exp, target, state)
 
 	generate_bytecode_insns (finally, IGNORE_TARGET, state);
 	maybe_wide (OPCODE_ret, DECL_LOCAL_INDEX (return_link), state);
+	localvar_free (exception_decl, state);
 	localvar_free (return_link, state);
 	define_jcf_label (finished_label, state);
       }

gcc/java/parse.y

@@ -11185,6 +11185,10 @@ java_complete_lhs (node)
     case TRY_FINALLY_EXPR:
       COMPLETE_CHECK_OP_0 (node);
       COMPLETE_CHECK_OP_1 (node);
+      if (TREE_OPERAND (node, 0) == empty_stmt_node)
+	return TREE_OPERAND (node, 1);
+      if (TREE_OPERAND (node, 1) == empty_stmt_node)
+	return TREE_OPERAND (node, 0);
       CAN_COMPLETE_NORMALLY (node)
 	= (CAN_COMPLETE_NORMALLY (TREE_OPERAND (node, 0))
 	   && CAN_COMPLETE_NORMALLY (TREE_OPERAND (node, 1)));

gcc/java/verify.c

@@ -1137,7 +1137,7 @@ verify_jvm_instructions (jcf, byte_ops, length)
 
 	case OPCODE_athrow:
 	  /* FIXME: athrow also empties the stack. */
-	  pop_type (throwable_type_node);
+	  POP_TYPE (throwable_type_node, "missing throwable at athrow" );
 	  INVALIDATE_PC;
 	  break;
 
@@ -1156,7 +1156,7 @@ verify_jvm_instructions (jcf, byte_ops, length)
 	  {
 	    jint low, high;
 
-	    pop_type (int_type_node);
+	    POP_TYPE (int_type_node, "missing int for tableswitch");
 	    while (PC%4)
 	      {
 	        if (byte_ops[PC++])
@@ -1179,7 +1179,7 @@ verify_jvm_instructions (jcf, byte_ops, length)
 	  {
 	    jint npairs, last = 0, not_registered = 1;
 
-	    pop_type (int_type_node);
+	    POP_TYPE (int_type_node, "missing int for lookupswitch");
 	    while (PC%4)
 	      {
 	        if (byte_ops[PC++])