[M3commit] CVS Update: cm3

[Jay Krell]

CVSROOT:	/usr/cvs
Changes by:	jkrell at birch.	13/04/20 19:56:41

Modified files:
	cm3/m3-sys/m3back/src/: M3C.m3 

Log message:
	turn back on #line directives
	prepare for passing structs by value:
	VAR PassStructsByValue := FALSE;
	VAR ReturnStructsByValue := FALSE; (* tied in with frontend/target)
	make missing types in pop_struct an error now that frontend fixed
	
	structs by value cause an interesting reversal,
	my thinking is thus:
	
	NOT by value, current scheme:
	
	void Procedure(struct* uplevel)
	{
	struct
	{
	struct uplevel;
	} frame = {*uplevel};
	}
	
	by value:
	void Procedure(struct uplevel)
	{
	struct
	{
	struct* uplevel;
	} frame = {&uplevel};
	}
	
	i.e. still have to "copy some value into frame struct"
	but it changes from value to pointer
	
	though, if the struct is size of a pointer or smaller,
	we might as well copy the value
	
	also prepare for returning structs by value, though frontend
	doesn't seem setup for that