1 /*****************************************************************************/
5 /* Code label structure */
9 /* (C) 2001-2009, Ullrich von Bassewitz */
10 /* Roemerstrasse 52 */
11 /* D-70794 Filderstadt */
12 /* EMail: uz@cc65.org */
15 /* This software is provided 'as-is', without any expressed or implied */
16 /* warranty. In no event will the authors be held liable for any damages */
17 /* arising from the use of this software. */
19 /* Permission is granted to anyone to use this software for any purpose, */
20 /* including commercial applications, and to alter it and redistribute it */
21 /* freely, subject to the following restrictions: */
23 /* 1. The origin of this software must not be misrepresented; you must not */
24 /* claim that you wrote the original software. If you use this software */
25 /* in a product, an acknowledgment in the product documentation would be */
26 /* appreciated but is not required. */
27 /* 2. Altered source versions must be plainly marked as such, and must not */
28 /* be misrepresented as being the original software. */
29 /* 3. This notice may not be removed or altered from any source */
32 /*****************************************************************************/
47 /*****************************************************************************/
49 /*****************************************************************************/
53 CodeLabel* NewCodeLabel (const char* Name, unsigned Hash)
54 /* Create a new code label, initialize and return it */
57 CodeLabel* L = xmalloc (sizeof (CodeLabel));
59 /* Initialize the fields */
61 L->Name = xstrdup (Name);
64 InitCollection (&L->JumpFrom);
66 /* Return the new label */
72 void FreeCodeLabel (CodeLabel* L)
73 /* Free the given code label */
78 /* Free the collection */
79 DoneCollection (&L->JumpFrom);
81 /* Delete the struct */
87 void CL_AddRef (CodeLabel* L, struct CodeEntry* E)
88 /* Let the CodeEntry E reference the label L */
90 /* The insn at E jumps to this label */
93 /* Replace the code entry argument with the name of the new label */
94 CE_SetArg (E, L->Name);
96 /* Remember that in the label */
97 CollAppend (&L->JumpFrom, E);
102 void CL_MoveRefs (CodeLabel* OldLabel, CodeLabel* NewLabel)
103 /* Move all references to OldLabel to point to NewLabel. OldLabel will have no
104 * more references on return.
107 /* Walk through all instructions referencing the old label */
108 unsigned Count = CL_GetRefCount (OldLabel);
111 /* Get the instruction that references the old label */
112 CodeEntry* E = CL_GetRef (OldLabel, Count);
114 /* Change the reference to the new label */
115 CHECK (E->JumpTo == OldLabel);
116 CL_AddRef (NewLabel, E);
120 /* There are no more references to the old label */
121 CollDeleteAll (&OldLabel->JumpFrom);
126 void CL_Output (const CodeLabel* L)
127 /* Output the code label to the output file */
129 WriteOutput ("%s:", L->Name);
130 if (strlen (L->Name) > 6) {
131 /* Label is too long, add a linefeed */