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Working on the new backend

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git-svn-id: svn://svn.cc65.org/cc65/trunk@709 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2001-05-03 22:06:59 +00:00
parent 42695dd3c3
commit c71a80b0af
9 changed files with 254 additions and 12 deletions
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2
src/cc65/asmcode.c
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@ -37,6 +37,7 @@
#include "check.h"
/* b6502 */
#include "codeopt.h"
#include "codeseg.h"
#include "dataseg.h"
@ -111,6 +112,7 @@ void WriteOutput (FILE* F)
/* Function which is defined and referenced or extern */
PrintFunctionHeader (F, Entry);
MergeCodeLabels (Entry->V.F.CS);
RunOpt (Entry->V.F.CS);
fprintf (F, "; Data segment for function %s:\n", Entry->Name);
OutputDataSeg (F, Entry->V.F.DS);
fprintf (F, "; Code segment for function %s:\n", Entry->Name);

2
src/cc65/codegen.h
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@ -9,7 +9,7 @@
/* (C) 1998-2001 llrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */

12
src/cc65/codelab.c
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@ -82,6 +82,18 @@ void FreeCodeLabel (CodeLabel* L)
unsigned RemoveLabelRef (CodeLabel* L, const struct CodeEntry* E)
/* Remove a reference to this label, return the number of remaining references */
{
/* Delete the item */
CollDeleteItem (&L->JumpFrom, E);
/* Return the number of remaining references */
return CollCount (&L->JumpFrom);
}
void OutputCodeLabel (FILE* F, const CodeLabel* L)
/* Output the code label to a file */
{

13
src/cc65/codelab.h
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@ -45,6 +45,16 @@
/*****************************************************************************/
/* Forwards */
/*****************************************************************************/
struct CodeEntry;
/*****************************************************************************/
/* struct CodeLabel */
/*****************************************************************************/
@ -79,6 +89,9 @@ CodeLabel* NewCodeLabel (const char* Name, unsigned Hash);
void FreeCodeLabel (CodeLabel* L);
/* Free the given code label */
unsigned RemoveLabelRef (CodeLabel* L, const struct CodeEntry* E);
/* Remove a reference to this label, return the number of remaining references */
void OutputCodeLabel (FILE* F, const CodeLabel* L);
/* Output the code label to a file */

147
src/cc65/codeopt.c Normal file
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@ -0,0 +1,147 @@
/*****************************************************************************/
/* */
/* codeopt.c */
/* */
/* Optimizer subroutines */
/* */
/* */
/* */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
/* b6502 */
#include "codeent.h"
#include "codeopt.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/* Counter for the number of changes in one run. The optimizer process is
* repeated until there are no more changes.
*/
static unsigned OptChanges;
/*****************************************************************************/
/* Remove dead jumps */
/*****************************************************************************/
static void OptDeadJumps (CodeSeg* S)
/* Remove dead jumps (jumps to the next instruction) */
{
CodeEntry* E;
unsigned I;
/* Get the number of entries, bail out if we have less than two entries */
unsigned Count = CollCount (&S->Entries);
if (Count < 2) {
return;
}
/* Walk over all entries minus the last one */
I = 0;
while (I < Count-1) {
/* Get the next entry */
E = CollAt (&S->Entries, I);
/* Check if it's a branch, if it has a local target, and if the target
* is the next instruction.
*/
if (E->AM == AM_BRA) {
printf ("BRA on entry %u:\n", I);
if (E->JumpTo) {
printf (" JumpTo ok\n");
if (E->JumpTo->Owner == CollAt (&S->Entries, I+1)) {
printf (" Branch to next insn\n");
}
}
}
if (E->AM == AM_BRA && E->JumpTo && E->JumpTo->Owner == CollAt (&S->Entries, I+1)) {
/* Remember the label */
CodeLabel* L = E->JumpTo;
/* Jump to next instruction, remove it */
unsigned Remaining = RemoveLabelRef (L, E);
CollDelete (&S->Entries, I);
FreeCodeEntry (E);
--Count;
/* If the label has no more references, remove it */
if (Remaining == 0) {
CollDeleteItem (&L->Owner->Labels, L);
FreeCodeLabel (L);
}
/* Remember we had changes */
++OptChanges;
} else {
/* Next entry */
++I;
}
}
}
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void RunOpt (CodeSeg* S)
/* Run the optimizer */
{
printf ("Optimize\n");
/* Repeat all steps until there are no more changes */
do {
/* Reset the number of changes */
OptChanges = 0;
OptDeadJumps (S);
} while (OptChanges > 0);
}

67
src/cc65/codeopt.h Normal file
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@ -0,0 +1,67 @@
/*****************************************************************************/
/* */
/* codeopt.h */
/* */
/* Optimizer subroutines */
/* */
/* */
/* */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#ifndef CODEOPT_H
#define CODEOPT_H
/* b6502 */
#include "codeseg.h"
/*****************************************************************************/
/* Data */
/*****************************************************************************/
/*****************************************************************************/
/* Code */
/*****************************************************************************/
void RunOpt (CodeSeg* S);
/* Run the optimizer */
/* End of codeopt.h */
#endif

7
src/cc65/codeseg.c
View File

@ -270,11 +270,10 @@ static CodeEntry* ParseInsn (CodeSeg* S, const char* L)
}
/* If the instruction is a branch, check for the label and generate it
* if it does not exist. In case of a PC relative branch (*+x) we will
* not generate a label, because the target label will not be defined.
* if it does not exist. Ignore anything but local labels here.
*/
Label = 0;
if ((OPC->Info & CI_MASK_BRA) == CI_BRA && Expr[0] != '*') {
if ((OPC->Info & CI_MASK_BRA) == CI_BRA && Expr[0] == 'L') {
unsigned Hash;
@ -455,6 +454,8 @@ void AddCodeSegLine (CodeSeg* S, const char* Format, ...)
L->Flags |= LF_DEF;
/* Move it to the code entry */
CollAppend (&E->Labels, L);
/* Tell the label about it's owner */
L->Owner = E;
}
/* Delete the transfered labels */

8
src/cc65/opcodes.c
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@ -6,10 +6,10 @@
/* */
/* */
/* */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */

8
src/cc65/opcodes.h
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@ -6,10 +6,10 @@
/* */
/* */
/* */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */