From 0c39f03a14be51224b1a44a74121740076956243 Mon Sep 17 00:00:00 2001
From: DeaDDooMER <deaddoomer@deadsoftware.ru>
Date: Sat, 29 Jul 2017 13:20:22 +0300
Subject: [PATCH] =?utf8?q?JVM:=20=D0=94=D0=BE=D0=B1=D0=B0=D0=B2=D0=BB?=
 =?utf8?q?=D0=B5=D0=BD=D0=BE=20=D0=BA=D0=BE=D0=BF=D0=B8=D1=80=D0=BE=D0=B2?=
 =?utf8?q?=D0=B0=D0=BD=D0=B8=D0=B5=20=D0=B7=D0=B0=D0=BF=D0=B8=D1=81=D0=B5?=
 =?utf8?q?=D0=B9?=
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---
 notes                            |   8 +++
 src/backends/jvm/generator-jvm.c | 102 ++++++++++++++++++++++++++++---
 src/test.c                       |  24 +++++---
 3 files changed, 117 insertions(+), 17 deletions(-)

diff --git a/notes b/notes
index 60b17bd..3cc0297 100644
--- a/notes
+++ b/notes
@@ -1,3 +1,11 @@
+- Какие-то проблемы с определением типов наперёд:
+  (*
+    TYPE
+    R2 = RECORD r : R1 END;
+    R1 = RECORD END;
+  *)
+
+
 - нет символов и строк
 - нужен автокаст int -> real для DIV. Да и вообще каст типов.
 
diff --git a/src/backends/jvm/generator-jvm.c b/src/backends/jvm/generator-jvm.c
index cbc834e..b46b27d 100644
--- a/src/backends/jvm/generator-jvm.c
+++ b/src/backends/jvm/generator-jvm.c
@@ -48,6 +48,7 @@ jvm_generate_function_header(gen_proc_t * p, char * access, char * name, char *
 	class -> p = p;
 
 	fprintf(class -> fp, ".method %s %s%s\n", access, name, signature);
+	fprintf(class -> fp, "  start:\n");
 }
 
 void
@@ -66,6 +67,7 @@ jvm_generate_function_end(gen_proc_t * p)
 
 	fprintf(class -> fp, "  .limit stack %i \t; current(%i)\n", max_pointer, pointer);
 	fprintf(class -> fp, "  .limit locals %i \t; current(%i)\n", max_locals, locals);
+	fprintf(class -> fp, "  end:\n");
 	fprintf(class -> fp, ".end method\n\n");
 }
 
@@ -104,7 +106,11 @@ static void
 jvm_stack_pop(gen_proc_t * p, unsigned size)
 {
 	p -> stack -> pointer -= size;
-	assert(p -> stack -> pointer >= 0);
+
+	if(p -> stack -> pointer < 0)
+	{
+		printf("WARING: stack pointer %i\n", p -> stack -> pointer);
+	}
 }
 
 static void
@@ -261,7 +267,7 @@ jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num);
 /*
  * Функция jvm_generate_static_array_initialization генерирует код для
  * статической инициализации массива. На входе массив, на выходе тот же массив.
- * arrayref -- arrayref
+ * (arrayref -- arrayref)
  */
 
 static void
@@ -400,6 +406,32 @@ jvm_generate_new(gen_proc_t * p, oberon_type_t * type, int num)
 	}
 }
 
+static void
+jvm_generate_load(gen_proc_t * p, oberon_type_t * src_type, gen_var_t * src)
+{
+	char prefix;
+	int cell_size;
+
+	cell_size = jvm_cell_size_for_type(src_type);
+
+	switch(src -> storage)
+	{
+		case JVM_STORAGE_REGISTER:
+			prefix = jvm_get_prefix(src_type);
+			jvm_generate(p, 0, cell_size, "%cload %i", prefix, src -> reg);
+			break;
+		case JVM_STORAGE_STATIC:
+			jvm_generate(p, 0, cell_size, "getstatic %s %s", src -> full_name, src -> desc);
+			break;
+		case JVM_STORAGE_FIELD:
+			jvm_generate(p, 1, cell_size, "getfield %s %s", src -> full_name, src -> desc);
+			break;
+		default:
+			gen_error("jvm_generate_load: unknow storage type %i", src -> storage);
+			break;
+	}
+}
+
 static void
 jvm_generate_store(gen_proc_t * p, oberon_type_t * src_type, gen_var_t * dst)
 {
@@ -426,6 +458,22 @@ jvm_generate_store(gen_proc_t * p, oberon_type_t * src_type, gen_var_t * dst)
 	}
 }
 
+/*
+ * Генерирует код для копирования полей из первой записи во вторую.
+ *  ( aref_dst aref_src -- )
+ *  dst := src;
+ */
+
+static void
+jvm_generate_copy_record(gen_proc_t * p, oberon_type_t * rec)
+{
+	assert(rec -> class == OBERON_TYPE_RECORD);
+	char * desc = jvm_get_descriptor(rec);
+	char * cname = jvm_get_class_full_name(rec);
+	jvm_generate(p, 1 + 1, 0, "invokestatic %s/$COPY$(%s%s)V", cname, desc, desc);
+}
+
+
 // ==========================================
 // ==========================================
 // ==========================================
@@ -543,13 +591,13 @@ oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
 		field = field -> next;
 	}
 
+	/* Стандартный конструктор класса */
+	/* Инициализирует внутренние статические записи и массивы */
 	gen_proc_t * p = jvm_create_proc(class);
-
 	jvm_generate_function_header(p, "public", "<init>", "()V");
 	jvm_alloc_register_untyped(p -> rf, false);
 	jvm_generate(p, 0, 1, "aload_0");
 	jvm_generate(p, 1, 0, "invokespecial java/lang/Object/<init>()V");
-
 	num = rec -> num_decl;
 	field = rec -> decl;
 	for(int i = 0; i < num; i++)
@@ -562,8 +610,45 @@ oberon_generator_init_record(oberon_context_t * ctx, oberon_type_t * rec)
 			jvm_generate_store(p, field -> type, field -> gen_var);
 		}
 		field = field -> next;
-	}	
+	}
+	jvm_generate(p, 0, 0, "return");
+	jvm_generate_function_end(p);
 
+	/* Метод для копирования полей класса */
+	/* reg0 == src -> reg1 == dst */
+	p = jvm_create_proc(class);
+	gen_var_t * copy_dst = oberon_generator_new_var();
+	gen_var_t * copy_src = oberon_generator_new_var();
+	char * desc = jvm_get_descriptor(rec);
+	char * signature = new_string("(%s%s)V", desc, desc);
+	jvm_generate_function_header(p, "public static", "$COPY$", signature);
+	jvm_generate_and_init_named_local_var(copy_dst, p, false, "dst", desc);
+	jvm_generate_and_init_named_local_var(copy_src, p, false, "src", desc);
+	num = rec -> num_decl;
+	field = rec -> decl;
+	for(int i = 0; i < num; i++)
+	{
+		if(field -> type -> class == OBERON_TYPE_RECORD)
+		{
+			jvm_generate_load(p, rec, copy_dst);
+			jvm_generate_load(p, field -> type, field -> gen_var);
+			jvm_generate_load(p, rec, copy_src);
+			jvm_generate_load(p, field -> type, field -> gen_var);
+			jvm_generate_copy_record(p, field -> type);
+		}
+		else if(field -> type -> class == OBERON_TYPE_ARRAY)
+		{
+			gen_error("copy array not implemented");
+		}
+		else
+		{
+			jvm_generate_load(p, rec, copy_dst);
+			jvm_generate_load(p, rec, copy_src);
+			jvm_generate_load(p, field -> type, field -> gen_var);
+			jvm_generate_store(p, field -> type, field -> gen_var);
+		}
+		field = field -> next;
+	}
 	jvm_generate(p, 0, 0, "return");
 	jvm_generate_function_end(p);
 
@@ -1132,10 +1217,11 @@ store_expr(gen_proc_t * p, oberon_expr_t * dst, oberon_expr_t * src)
 	else if(dst -> result -> class == OBERON_TYPE_RECORD
 		|| src -> result -> class == OBERON_TYPE_RECORD)
 	{
-		gen_error("record copy not implemented");
+		push_expr(p, dst);
+		push_expr(p, src);
+		jvm_generate_copy_record(p, dst -> result);
 	}
-
-	switch(item -> mode)
+	else switch(item -> mode)
 	{
 		case MODE_VAR:
 			push_expr(p, src);
diff --git a/src/test.c b/src/test.c
index 02912bb..b0e9bda 100644
--- a/src/test.c
+++ b/src/test.c
@@ -8,18 +8,24 @@ static char source_test[] =
 	"(* Main module *)"
 	"MODULE Test;"
 	"TYPE"
+	"  RecA = RECORD"
+	"    i, j, k : INTEGER;"
+	"  END;"
+	""
 	"  Rec = POINTER TO RecDesc;"
-	"  RecDesc = RECORD x : INTEGER; END;"
+	"  RecDesc = RECORD"
+	"    x, y, z : INTEGER;"
+	"    r, q, s : RecA;"
+	"    p, c, g : Rec;"
+	"  END;"
+	""
 	"VAR"
-	"  g : ARRAY 4 OF INTEGER;"
-	"  r : RECORD x : INTEGER; END;"
-	"  a : POINTER TO ARRAY OF ARRAY OF Rec;"
+	"  a, b : Rec;"
+	""
 	"BEGIN"
-	"  NEW(a, 10, 10);"
-	"  NEW(a[9, 9]);"
-	"  a[9, 9].x := 666;"
-	"  g[3] := 4;"
-	"  r.x := 4546;"
+	"  NEW(a);"
+	"  NEW(b);"
+	"  a^ := b^;"
 	"END Test."
 ;
 
-- 
2.29.2