From 6152ca4953bd23e1b6f7fd68966efc6b48e48361 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Thu, 6 Aug 2020 20:24:29 +0200
Subject: started with locals in procedures and adressing

---
 ecomp-c/ec.c                              | 27 ++++++++++++++++++++++++++-
 ecomp-c/test.sh                           |  1 +
 ecomp-c/tests/procedure_local_variables.e | 24 ++++++++++++++++++++++++
 3 files changed, 51 insertions(+), 1 deletion(-)
 create mode 100644 ecomp-c/tests/procedure_local_variables.e

diff --git a/ecomp-c/ec.c b/ecomp-c/ec.c
index fc283e0..c98c766 100644
--- a/ecomp-c/ec.c
+++ b/ecomp-c/ec.c
@@ -675,6 +675,7 @@ typedef struct Symbol {
 	int *intarr_value;
 	/* variable */
 	int size;
+	int offset;
 	/* array type */
 	int dim;
 	/* procedure type */
@@ -796,6 +797,7 @@ static Symbol *insert_symbol( Scope *scope, char *name, SymbolClass class )
 	sym->name = Allocate( strlen( name ) + 1 );
 	strlcpy( sym->name, name, strlen( name ) + 1 );	
 	sym->size = 0;
+	sym->offset = 0;
 	sym->dim = 0;
 	sym->next = scope->symbol;
 	sym->string_value = NULL;
@@ -1959,6 +1961,9 @@ static void parseProcedureBlock( Scope *scope )
 	
 	if( sym == S_const || sym == S_var || sym == S_begin ) {
 
+		Symbol *sym;
+		int size_locals;
+
 		Emit( "; PROC %s\n", symbol->name );
 		
 		Emit( "%s:\n", symbol->label );	
@@ -1970,11 +1975,31 @@ static void parseProcedureBlock( Scope *scope )
 
 		/* local scope holding all local defitions */
 		symbol->scope = create_scope( scope, symbol->name );
+		
+		/* TODO: parse parameters, assign parameter values to
+		 * local variables (when passed by value) or set
+		 * addresses for VAR parameters */
 
 		parseProcedureDeclarationBlock( symbol->scope );
 		
-		/* TODO: allocate space on stack for local variables */
+		size_locals = 0;
+		sym = symbol->scope->symbol;
+		while( sym != NULL ) {
+			if( sym->class == SYMBOL_CLASS_VARIABLE ) {
+				size_locals += get_size( sym );
+			}
+			sym = sym->next;
+		}
+		
+		if( size_locals > 0 ) {
+			Emit( "mov eax, %d\n", size_locals );
+			Emit( "sub esp, eax\n" );
+		}
+		
+		/* TODO: allocate space on stack for local variables (and
+		 * parameters) */
 		/* TODO: assign symbols to relative addresses (base pointer) */
+		/* TODO: initialize local variables */
 
 		parseStatementBlock( symbol->scope );
 		
diff --git a/ecomp-c/test.sh b/ecomp-c/test.sh
index 9f192f3..014eb98 100755
--- a/ecomp-c/test.sh
+++ b/ecomp-c/test.sh
@@ -24,6 +24,7 @@ type_check_comparision
 while_statement
 procedure_call
 procedure_forward_declaration
+procedure_local_variables
 procedure_scoping
 example_divisors
 example_divisors_array_result
diff --git a/ecomp-c/tests/procedure_local_variables.e b/ecomp-c/tests/procedure_local_variables.e
new file mode 100644
index 0000000..2838203
--- /dev/null
+++ b/ecomp-c/tests/procedure_local_variables.e
@@ -0,0 +1,24 @@
+/*
+ * procedure call with local variables
+ */
+
+module procedure_call;
+
+var
+	i : integer := 0;
+	
+procedure proc;
+const
+	C : integer = 42;
+var
+	j : integer;
+	k : integer := C;
+	
+begin
+	j := i;
+	i := k;
+end
+
+begin
+	proc;
+end
-- 
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