From 7f32ad51b0f08446d7f66e5403d69299d0d60021 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Fri, 1 Oct 2021 21:10:36 +0200
Subject: c4: added strl* functions cc: started peudo function parsing,
 currently for void main() only some philosophical thinking and testing around
 forward function declarations

---
 miniany/cc.c | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

(limited to 'miniany/cc.c')

diff --git a/miniany/cc.c b/miniany/cc.c
index 5cf2f9c..c630a8f 100644
--- a/miniany/cc.c
+++ b/miniany/cc.c
@@ -1411,11 +1411,13 @@ void parseStatementBlock( struct Compiler *compiler )
 	parserExpect( parser, S_RBRACE, "}" );
 }
 
-void parseFunctionDeclaraion( struct Compiler *compiler )
+void parseFunctionDeclaration( struct Compiler *compiler )
 {
 	struct Parser *parser;
+	struct Symbol *sym;
 
 	parser = compiler->parser;
+	
 	if( parser->token == S_IDENT ) {
 		if( strcmp( parser->scanner->ident, "void" ) != 0 ) {
 			scannerPrintErrorHeader( parser->scanner );
@@ -1424,18 +1426,35 @@ void parseFunctionDeclaraion( struct Compiler *compiler )
 			exit( EXIT_FAILURE );		
 		}
 	}
-	parser->token = getToken( parser->scanner );
+	
+	parserExpect( parser, S_IDENT, "identifier" );
+	sym = getSymbol( parser->global_scope, parser->scanner->ident );
+	if( sym == NULL ) {
+		sym = createSymbol( parser->scanner->ident );
+		insertSymbol( parser->global_scope, sym );
+	} else {
+		scannerPrintErrorHeader( parser->scanner );
+		putstring( "duplicate global symbol '" );
+		putstring( parser->scanner->ident );
+		putstring( "'" );
+		putnl( );
+		exit( EXIT_FAILURE );
+	}
 	if( parser->debug ) {
 		putstring( "; function declaration '" );
 		putstring( parser->scanner->ident );
 		putstring( "'" );
 		putnl( );
 	}
+	
 	putstring( parser->scanner->ident ); putchar( ':' ); putnl( );
+	putstring( "push ebp" ); putnl( );
+	putstring( "mov ebp, esp" ); putnl( );
 	parser->token = getToken( compiler->parser->scanner );
 	parserExpect( parser, S_LPAREN, "(" );
 	parserExpect( parser, S_RPAREN, ")" );
 	parseStatementBlock( compiler );
+	putstring( "pop ebp" ); putnl( );
 	putstring( "ret" ); putnl( );
 }
 
@@ -1467,11 +1486,11 @@ int main( int argc, char **argv )
 
 	compiler = createCompiler( );
 	/* compiler->parser->scanner->debug = 1; */
-	/* compiler->parser->debug = 1; */
+	compiler->parser->debug = 1;
 	/* compiler->generator->debug = 1; */
 	genPrologue( compiler );
 	compiler->parser->token = getToken( compiler->parser->scanner );
-	parseFunctionDeclaraion( compiler );
+	parseFunctionDeclaration( compiler );
 	genEpilogue( compiler );
 	freeCompiler( compiler );
 	
-- 
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