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https://github.com/cc65/cc65.git
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Fixed several uses of memory after free()
git-svn-id: svn://svn.cc65.org/cc65/trunk@1879 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
parent
abcc981253
commit
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@ -6,7 +6,7 @@
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/* */
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/* */
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/* */
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/* (C) 2001-2002 Ullrich von Bassewitz */
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/* (C) 2001-2003 Ullrich von Bassewitz */
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/* Wacholderweg 14 */
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/* D-70597 Stuttgart */
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/* EMail: uz@cc65.org */
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@ -500,97 +500,20 @@ static unsigned OptPtrStore1 (CodeSeg* S)
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X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+2);
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/* Delete the call to pushax */
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CS_DelEntry (S, I);
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/* Delete the call to ldauidx */
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CS_DelEntry (S, I+3);
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/* Insert the load from ptr1 */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[3]->LI);
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CS_InsertEntry (S, X, I+3);
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CS_InsertEntry (S, X, I+5);
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[2]->LI);
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CS_InsertEntry (S, X, I+4);
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CS_InsertEntry (S, X, I+6);
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/* Insert the store through ptr1 */
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X = NewCodeEntry (OP65_STA, AM65_ZP_INDY, "ptr1", 0, L[3]->LI);
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CS_InsertEntry (S, X, I+6+K);
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CS_InsertEntry (S, X, I+8+K);
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/* Delete the call to staspidx */
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CS_DelEntry (S, I+7+K);
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/* Remember, we had changes */
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++Changes;
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}
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/* Next entry */
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++I;
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}
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/* Return the number of changes made */
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return Changes;
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}
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static unsigned OptPtrStore2 (CodeSeg* S)
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/* Search for the sequence:
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*
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* jsr pushax
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* lda xxx
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* ldy yyy
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* jsr staspidx
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*
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* and replace it by:
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*
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* sta ptr1
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* stx ptr1+1
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* lda xxx
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* ldy yyy
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* sta (ptr1),y
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*/
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{
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unsigned Changes = 0;
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/* Walk over the entries */
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unsigned I = 0;
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while (I < CS_GetEntryCount (S)) {
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CodeEntry* L[4];
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/* Get next entry */
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L[0] = CS_GetEntry (S, I);
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/* Check for the sequence */
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if (CE_IsCallTo (L[0], "pushax") &&
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CS_GetEntries (S, L+1, I+1, 3) &&
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L[1]->OPC == OP65_LDA &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_LDY &&
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!CE_HasLabel (L[2]) &&
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CE_IsCallTo (L[3], "staspidx") &&
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!CE_HasLabel (L[3])) {
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CodeEntry* X;
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/* Create and insert the stores */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+1);
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X = NewCodeEntry (OP65_STX, AM65_ZP, "ptr1+1", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+2);
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/* Delete the call to pushax */
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CS_DelEntry (S, I);
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/* Insert the store through ptr1 */
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X = NewCodeEntry (OP65_STA, AM65_ZP_INDY, "ptr1", 0, L[3]->LI);
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CS_InsertEntry (S, X, I+4);
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/* Delete the call to staspidx */
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CS_DelEntry (S, I+5);
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/* Delete the old code */
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CS_DelEntry (S, I+9+K); /* jsr spaspidx */
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CS_DelEntry (S, I+4); /* jsr ldauidx */
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CS_DelEntry (S, I); /* jsr pushax */
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/* Remember, we had changes */
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++Changes;
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@ -655,58 +578,60 @@ static unsigned OptPtrLoad1 (CodeSeg* S)
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if (L[0]->OPC == OP65_CLC &&
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CS_GetEntries (S, L+1, I+1, 8) &&
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L[1]->OPC == OP65_ADC &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_TAY &&
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!CE_HasLabel (L[2]) &&
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L[3]->OPC == OP65_TXA &&
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!CE_HasLabel (L[3]) &&
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L[4]->OPC == OP65_ADC &&
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!CE_HasLabel (L[4]) &&
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L[5]->OPC == OP65_TAX &&
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!CE_HasLabel (L[5]) &&
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L[6]->OPC == OP65_TYA &&
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!CE_HasLabel (L[6]) &&
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L[7]->OPC == OP65_LDY &&
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!CE_HasLabel (L[7]) &&
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CE_IsCallTo (L[8], "ldauidx") &&
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!CE_HasLabel (L[8])) {
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!CS_RangeHasLabel (S, I+1, 8)) {
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CodeEntry* X;
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CodeEntry* P;
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/* Store the low byte and remove the TAY instead */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[1]->LI);
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CS_InsertEntry (S, X, I+2);
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CS_DelEntry (S, I+3);
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/* Track the insertion point */
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unsigned IP = I+2;
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/* Store the high byte */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[4]->LI);
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CS_InsertEntry (S, X, I+5);
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/* sta ptr1 */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[2]->LI);
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CS_InsertEntry (S, X, IP++);
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/* If the instruction before the adc is a ldx, replace the
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* txa by and lda with the same location of the ldx.
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/* If the instruction before the clc is a ldx, replace the
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* txa by an lda with the same location of the ldx. Otherwise
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* transfer the value in X to A.
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*/
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if ((P = CS_GetPrevEntry (S, I)) != 0 &&
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P->OPC == OP65_LDX &&
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!CE_HasLabel (P)) {
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X = NewCodeEntry (OP65_LDA, P->AM, P->Arg, 0, P->LI);
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CS_InsertEntry (S, X, I+4);
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CS_DelEntry (S, I+3);
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} else {
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X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, L[3]->LI);
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}
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CS_InsertEntry (S, X, IP++);
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/* Delete more transfer insns */
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CS_DelEntry (S, I+7);
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CS_DelEntry (S, I+6);
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/* adc yyy */
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X = NewCodeEntry (OP65_ADC, L[4]->AM, L[4]->Arg, 0, L[4]->LI);
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CS_InsertEntry (S, X, IP++);
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/* Delete the call to ldauidx */
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CS_DelEntry (S, I+7);
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/* sta ptr1+1 */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[5]->LI);
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CS_InsertEntry (S, X, IP++);
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/* Load high and low byte */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[7]->LI);
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CS_InsertEntry (S, X, I+7);
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[7]->LI);
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CS_InsertEntry (S, X, I+8);
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/* ldy ... */
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X = NewCodeEntry (OP65_LDY, L[7]->AM, L[7]->Arg, 0, L[7]->LI);
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CS_InsertEntry (S, X, IP++);
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/* ldx #$00 */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[8]->LI);
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CS_InsertEntry (S, X, IP++);
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/* lda (ptr1),y */
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[8]->LI);
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CS_InsertEntry (S, X, IP++);
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/* Remove the old instructions */
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CS_DelEntries (S, IP, 7);
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/* Remember, we had changes */
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++Changes;
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@ -748,6 +673,20 @@ static unsigned OptPtrLoad2 (CodeSeg* S)
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* ldy
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* ldx #$00
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* lda (ptr1),y
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*
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* adc xxx
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* sta ptr1
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* pha
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* txa
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* iny
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* adc yyy
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* sta ptr1+1
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* tax
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* pla
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* ldy
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* ldx #$00
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* lda (ptr1),y
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* jsr ldauidx
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*/
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{
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unsigned Changes = 0;
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@ -765,45 +704,36 @@ static unsigned OptPtrLoad2 (CodeSeg* S)
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if (L[0]->OPC == OP65_ADC &&
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CS_GetEntries (S, L+1, I+1, 8) &&
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L[1]->OPC == OP65_PHA &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_TXA &&
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!CE_HasLabel (L[2]) &&
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L[3]->OPC == OP65_INY &&
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!CE_HasLabel (L[3]) &&
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L[4]->OPC == OP65_ADC &&
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!CE_HasLabel (L[4]) &&
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L[5]->OPC == OP65_TAX &&
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!CE_HasLabel (L[5]) &&
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L[6]->OPC == OP65_PLA &&
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!CE_HasLabel (L[6]) &&
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L[7]->OPC == OP65_LDY &&
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!CE_HasLabel (L[7]) &&
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CE_IsCallTo (L[8], "ldauidx") &&
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!CE_HasLabel (L[8])) {
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!CS_RangeHasLabel (S, I+1, 8)) {
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CodeEntry* X;
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/* Store the low byte and remove the PHA instead */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+1);
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CS_DelEntry (S, I+2);
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/* Store the high byte */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[4]->LI);
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CS_InsertEntry (S, X, I+5);
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/* Delete more transfer and PLA insns */
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CS_DelEntry (S, I+7);
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CS_DelEntry (S, I+6);
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/* Delete the call to ldauidx */
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CS_DelEntry (S, I+7);
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CS_InsertEntry (S, X, I+6);
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/* Load high and low byte */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[6]->LI);
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CS_InsertEntry (S, X, I+7);
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CS_InsertEntry (S, X, I+10);
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[6]->LI);
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CS_InsertEntry (S, X, I+8);
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CS_InsertEntry (S, X, I+11);
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/* Delete the old code */
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CS_DelEntry (S, I+12); /* jsr ldauidx */
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CS_DelEntry (S, I+8); /* pla */
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CS_DelEntry (S, I+7); /* tax */
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CS_DelEntry (S, I+2); /* pha */
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/* Remember, we had changes */
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++Changes;
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@ -858,23 +788,18 @@ static unsigned OptPtrLoad3 (CodeSeg* S)
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CS_GetEntries (S, L+1, I+1, 7) &&
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L[1]->OPC == OP65_LDX &&
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L[1]->AM == AM65_IMM &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_CLC &&
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!CE_HasLabel (L[2]) &&
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L[3]->OPC == OP65_ADC &&
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(L[3]->AM == AM65_ABS || L[3]->AM == AM65_ZP) &&
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!CE_HasLabel (L[3]) &&
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(L[4]->OPC == OP65_BCC || L[4]->OPC == OP65_JCC) &&
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L[4]->JumpTo != 0 &&
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L[4]->JumpTo->Owner == L[6] &&
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!CE_HasLabel (L[4]) &&
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L[5]->OPC == OP65_INX &&
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!CE_HasLabel (L[5]) &&
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L[6]->OPC == OP65_LDY &&
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CE_KnownImm (L[6]) &&
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L[6]->Num == 0 &&
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CE_IsCallTo (L[7], "ldauidx") &&
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!CE_HasLabel (L[7]) &&
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!CS_RangeHasLabel (S, I+1, 7) &&
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/* Check the label last because this is quite costly */
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(Len = strlen (L[0]->Arg)) > 3 &&
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L[0]->Arg[0] == '<' &&
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@ -1506,7 +1431,6 @@ static OptFunc DOptPtrLoad5 = { OptPtrLoad5, "OptPtrLoad5", 65, 0,
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static OptFunc DOptPtrLoad6 = { OptPtrLoad6, "OptPtrLoad6", 86, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad7 = { OptPtrLoad7, "OptPtrLoad7", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore1 = { OptPtrStore1, "OptPtrStore1", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore2 = { OptPtrStore2, "OptPtrStore2", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPush1 = { OptPush1, "OptPush1", 65, 0, 0, 0, 0, 0 };
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static OptFunc DOptPush2 = { OptPush2, "OptPush2", 50, 0, 0, 0, 0, 0 };
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static OptFunc DOptPushPop = { OptPushPop, "OptPushPop", 0, 0, 0, 0, 0, 0 };
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@ -1568,7 +1492,6 @@ static OptFunc* OptFuncs[] = {
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&DOptPtrLoad6,
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&DOptPtrLoad7,
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&DOptPtrStore1,
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&DOptPtrStore2,
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&DOptPush1,
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&DOptPush2,
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&DOptPushPop,
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@ -1824,7 +1747,6 @@ static unsigned RunOptGroup1 (CodeSeg* S)
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unsigned Changes = 0;
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Changes += RunOptFunc (S, &DOptPtrStore1, 1);
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Changes += RunOptFunc (S, &DOptPtrStore2, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad1, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad2, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad3, 1);
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