0.pre8.75
[sbcl.git] / src / runtime / dynbind.c
1 /*
2  * support for dynamic binding from C
3  */
4
5 /*
6  * This software is part of the SBCL system. See the README file for
7  * more information.
8  *
9  * This software is derived from the CMU CL system, which was
10  * written at Carnegie Mellon University and released into the
11  * public domain. The software is in the public domain and is
12  * provided with absolutely no warranty. See the COPYING and CREDITS
13  * files for more information.
14  */
15
16 #include "runtime.h"
17 #include "sbcl.h"
18 #include "globals.h"
19 #include "dynbind.h"
20 #include "thread.h"
21 #include "genesis/symbol.h"
22 #include "genesis/binding.h"
23 #include "genesis/thread.h"
24
25 #if defined(__i386__)
26 #define GetBSP() ((struct binding *)SymbolValue(BINDING_STACK_POINTER,thread))
27 #define SetBSP(value) SetSymbolValue(BINDING_STACK_POINTER, (lispobj)(value),thread)
28 #else
29 #define GetBSP() ((struct binding *)current_binding_stack_pointer)
30 #define SetBSP(value) (current_binding_stack_pointer=(lispobj *)(value))
31 #endif
32
33 void bind_variable(lispobj symbol, lispobj value, void *th)
34 {
35     lispobj old_tl_value;
36     struct binding *binding;
37     struct thread *thread=(struct thread *)th;
38     struct symbol *sym=(struct symbol *)native_pointer(symbol);
39     binding = GetBSP();
40     SetBSP(binding+1);
41 #ifdef LISP_FEATURE_SB_THREAD
42     if(!sym->tls_index) {
43         sym->tls_index=SymbolValue(FREE_TLS_INDEX,0);
44         SetSymbolValue(FREE_TLS_INDEX,
45                        make_fixnum(fixnum_value(sym->tls_index)+1),0);
46     }
47 #endif
48     old_tl_value=SymbolTlValue(symbol,thread);
49     binding->value = old_tl_value;
50     binding->symbol = symbol;
51     SetTlSymbolValue(symbol, value,thread);
52 }
53
54 void
55 unbind(void *th)
56 {
57     struct thread *thread=(struct thread *)th;
58     struct binding *binding;
59     lispobj symbol;
60         
61     binding = GetBSP() - 1;
62                 
63     symbol = binding->symbol;
64
65     SetTlSymbolValue(symbol, binding->value,thread);
66
67     binding->symbol = 0;
68
69     SetBSP(binding);
70 }
71
72 void
73 unbind_to_here(lispobj *bsp,void *th)
74 {
75     struct thread *thread=(struct thread *)th;
76     struct binding *target = (struct binding *)bsp;
77     struct binding *binding = GetBSP();
78     lispobj symbol;
79
80     while (target < binding) {
81         binding--;
82
83         symbol = binding->symbol;
84         if (symbol) {
85             SetTlSymbolValue(symbol, binding->value,thread);
86             binding->symbol = 0;
87         }
88     }
89     SetBSP(binding);
90 }