Working on better handling of multithreading in general

and core dumps in particular.  See notes:

new types: register is something that when dereferenced gives you
	the registers.  the Ureg is no longer mapped at 0.
	refconst is something that gives a constant when dereferenced.

new builtin register("AX") creates register values
new builtin refconst(0x123) creates refconst values

new builtin var("foo") is equivalent to the variable foo
	(it returns foo but can also be used as the lhs of an assignment).

new acid function getregs() returns a list of the current values of registers.
new acid function setregs() sets the current registers to those values.
	note that getregs and setregs operate on register locations, not the
		register values themselves.
new acid function resetregs() sets registers to register("AX"), etc.
new acid function clearregs() sets all registers to constant -1.
the default register settings are as in resetregs(), not small numbers.

new acid variables coretext, pids, systype, corefile, cmdline.

new behavior: local variable lookup, stk, etc., use the acid values of registers
	(*PC, *SP, and so on), so the thread support code can change the context
	completely.

unary + is applicable to more data types and prints more often.

1 files changed, 10 insertions, 1 deletions

diff --git a/src/cmd/acid/acid.h b/src/cmd/acid/acid.h
index 44718009..866816e8 100644
--- a/src/cmd/acid/acid.h
+++ b/src/cmd/acid/acid.h
@@ -44,6 +44,7 @@ Extern int	interactive;
 Extern Node*	code;
 Extern int	na;
 Extern int	wtflag;
+Extern Regs*	acidregs;
 Extern Regs*	correg;
 Extern Map*	cormap;
 Extern Map*	symmap;
@@ -76,6 +77,8 @@ enum
 	TSTRING,
 	TLIST,
 	TCODE,
+	TREG,
+	TCON,
 	NUMT,
 };
 
@@ -129,6 +132,8 @@ struct Store
 		String*	string;
 		List*	l;
 		Node*	cc;
+		char*	reg;
+		Node*	con;
 	} u;
 };
 
@@ -182,6 +187,7 @@ struct String
 	int	len;
 };
 
+int	acidregsrw(Regs*, char*, ulong*, int);
 List*	addlist(List*, List*);
 void	addvarsym(Fhdr*);
 List*	al(int);
@@ -212,6 +218,7 @@ void	gc(void);
 char*	getstatus(int);
 void*	gmalloc(long);
 void	indir(Map*, ulong, char, Node*);
+void	indirreg(Regs*, char*, char, Node*);
 void	initexpr(void);
 void	initprint(void);
 void	installbuiltin(void);
@@ -257,7 +264,8 @@ void	userinit(void);
 void	varreg(void);
 void	varsym(void);
 void	whatis(Lsym*);
-void	windir(Map*, Node*, Node*, Node*);
+void	windir(Map*, Node, Node*, Node*);
+void	windirreg(Regs*, char*, Node*, Node*);
 void	yyerror(char*, ...);
 int	yylex(void);
 int	yyparse(void);
@@ -313,5 +321,6 @@ enum
 	OFMT,
 	OEVAL,
 	OWHAT,
+	OUPLUS,
 	NUMO,
 };