X-Git-Url: https://git.sur5r.net/?a=blobdiff_plain;f=src%2Fcc65%2Fcodeent.c;h=13b7aed146701f961315ee240d2aa8b49bc34109;hb=dbb9a31fd908fe85fd9d4ccf1397564a3d027953;hp=3868a353103f7e0b14d80dac9f66ba7441019a1f;hpb=387ebfd3961c28ac419a42ef02ee5d3b00497043;p=cc65 diff --git a/src/cc65/codeent.c b/src/cc65/codeent.c index 3868a3531..13b7aed14 100644 --- a/src/cc65/codeent.c +++ b/src/cc65/codeent.c @@ -6,10 +6,10 @@ /* */ /* */ /* */ -/* (C) 2001-2003 Ullrich von Bassewitz */ -/* Römerstrasse 52 */ -/* D-70794 Filderstadt */ -/* EMail: uz@cc65.org */ +/* (C) 2001-2005, Ullrich von Bassewitz */ +/* Römerstrasse 52 */ +/* D-70794 Filderstadt */ +/* EMail: uz@cc65.org */ /* */ /* */ /* This software is provided 'as-is', without any expressed or implied */ @@ -144,7 +144,7 @@ static void SetUseChgInfo (CodeEntry* E, const OPCDesc* D) * lookup the information about this function and use it. The jump itself * does not change any registers, so we don't need to use the data from D. */ - if ((E->Info & (OF_BRA | OF_CALL)) != 0 && E->JumpTo == 0) { + if ((E->Info & (OF_UBRA | OF_CALL)) != 0 && E->JumpTo == 0) { /* A subroutine call or jump to external symbol (function exit) */ GetFuncInfo (E->Arg, &E->Use, &E->Chg); } else { @@ -306,7 +306,7 @@ void CE_ReplaceOPC (CodeEntry* E, opc_t OPC) int CodeEntriesAreEqual (const CodeEntry* E1, const CodeEntry* E2) /* Check if both code entries are equal */ { - return E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0; + return (E1->OPC == E2->OPC && E1->AM == E2->AM && strcmp (E1->Arg, E2->Arg) == 0); } @@ -323,6 +323,22 @@ void CE_AttachLabel (CodeEntry* E, CodeLabel* L) +void CE_ClearJumpTo (CodeEntry* E) +/* Clear the JumpTo entry and the argument (which contained the name of the + * label). Note: The function will not clear the backpointer from the label, + * so use it with care. + */ +{ + /* Clear the JumpTo entry */ + E->JumpTo = 0; + + /* Clear the argument and assign the empty one */ + FreeArg (E->Arg); + E->Arg = EmptyArg; +} + + + void CE_MoveLabel (CodeLabel* L, CodeEntry* E) /* Move the code label L from it's former owner to the code entry E. */ { @@ -336,6 +352,18 @@ void CE_MoveLabel (CodeLabel* L, CodeEntry* E) +void CE_SetArg (CodeEntry* E, const char* Arg) +/* Replace the argument by the new one. */ +{ + /* Free the old argument */ + FreeArg (E->Arg); + + /* Assign the new one */ + E->Arg = GetArgCopy (Arg); +} + + + void CE_SetNumArg (CodeEntry* E, long Num) /* Set a new numeric argument for the given code entry that must already * have a numeric argument. @@ -357,11 +385,8 @@ void CE_SetNumArg (CodeEntry* E, long Num) Internal ("Invalid instruction size in CE_SetNumArg"); } - /* Free the old argument */ - FreeArg (E->Arg); - - /* Assign the new one */ - E->Arg = GetArgCopy (Buf); + /* Replace the argument by the new one */ + CE_SetArg (E, Buf); /* Use the new numerical value */ E->Num = Num; @@ -369,19 +394,58 @@ void CE_SetNumArg (CodeEntry* E, long Num) -int CE_KnownImm (const CodeEntry* E) -/* Return true if the argument of E is a known immediate value */ +int CE_IsConstImm (const CodeEntry* E) +/* Return true if the argument of E is a constant immediate value */ { return (E->AM == AM65_IMM && (E->Flags & CEF_NUMARG) != 0); } +int CE_IsKnownImm (const CodeEntry* E, unsigned long Num) +/* Return true if the argument of E is a constant immediate value that is + * equal to Num. + */ +{ + return E->AM == AM65_IMM && + (E->Flags & CEF_NUMARG) != 0 && + E->Num == Num; +} + + + int CE_UseLoadFlags (const CodeEntry* E) /* Return true if the instruction uses any flags that are set by a load of * a register (N and Z). */ { + /* Follow unconditional branches, but beware of endless loops. After this, + * E will point to the first entry that is not a branch. + */ + if (E->Info & OF_UBRA) { + Collection C = AUTO_COLLECTION_INITIALIZER; + + /* Follow the chain */ + while (E->Info & OF_UBRA) { + + /* Remember the entry so we can detect loops */ + CollAppend (&C, (void*) E); + + /* Check the target */ + if (E->JumpTo == 0 || CollIndex (&C, E->JumpTo->Owner) >= 0) { + /* Unconditional jump to external symbol, or endless loop. */ + DoneCollection (&C); + return 0; /* Flags not used */ + } + + /* Follow the chain */ + E = E->JumpTo->Owner; + } + + /* Delete the collection */ + DoneCollection (&C); + } + /* A branch will use the flags */ if (E->Info & OF_FBRA) { return 1; @@ -420,7 +484,7 @@ void CE_FreeRegInfo (CodeEntry* E) /* Free an existing register info struct */ { if (E->RI) { - FreeRegInfo (E->RI); + FreeRegInfo (E->RI); E->RI = 0; } } @@ -467,7 +531,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs) case OP65_AND: if (RegValIsKnown (In->RegA)) { - if (CE_KnownImm (E)) { + if (CE_IsConstImm (E)) { Out->RegA = In->RegA & (short) E->Num; } else if (E->AM == AM65_ZP) { switch (GetKnownReg (E->Use & REG_ZP, In)) { @@ -624,7 +688,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs) case OP65_EOR: if (RegValIsKnown (In->RegA)) { - if (CE_KnownImm (E)) { + if (CE_IsConstImm (E)) { Out->RegA = In->RegA ^ (short) E->Num; } else if (E->AM == AM65_ZP) { switch (GetKnownReg (E->Use & REG_ZP, In)) { @@ -773,7 +837,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs) break; case OP65_LDA: - if (CE_KnownImm (E)) { + if (CE_IsConstImm (E)) { Out->RegA = (unsigned char) E->Num; } else if (E->AM == AM65_ZP) { switch (GetKnownReg (E->Use & REG_ZP, In)) { @@ -803,7 +867,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs) break; case OP65_LDX: - if (CE_KnownImm (E)) { + if (CE_IsConstImm (E)) { Out->RegX = (unsigned char) E->Num; } else if (E->AM == AM65_ZP) { switch (GetKnownReg (E->Use & REG_ZP, In)) { @@ -833,7 +897,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs) break; case OP65_LDY: - if (CE_KnownImm (E)) { + if (CE_IsConstImm (E)) { Out->RegY = (unsigned char) E->Num; } else if (E->AM == AM65_ZP) { switch (GetKnownReg (E->Use & REG_ZP, In)) { @@ -894,7 +958,7 @@ void CE_GenRegInfo (CodeEntry* E, RegContents* InputRegs) case OP65_ORA: if (RegValIsKnown (In->RegA)) { - if (CE_KnownImm (E)) { + if (CE_IsConstImm (E)) { Out->RegA = In->RegA | (short) E->Num; } else if (E->AM == AM65_ZP) { switch (GetKnownReg (E->Use & REG_ZP, In)) { @@ -1269,6 +1333,35 @@ static char* RegInfoDesc (unsigned U, char* Buf) +static char* RegContentDesc (const RegContents* RC, char* Buf) +/* Return a string containing register contents */ +{ + char* B = Buf; + + if (RegValIsUnknown (RC->RegA)) { + strcpy (B, "A:XX "); + } else { + sprintf (B, "A:%02X ", RC->RegA); + } + B += 5; + if (RegValIsUnknown (RC->RegX)) { + strcpy (B, "X:XX "); + } else { + sprintf (B, "X:%02X ", RC->RegX); + } + B += 5; + if (RegValIsUnknown (RC->RegY)) { + strcpy (B, "Y:XX"); + } else { + sprintf (B, "Y:%02X", RC->RegY); + } + B += 4; + + return Buf; +} + + + void CE_Output (const CodeEntry* E, FILE* F) /* Output the code entry to a file */ { @@ -1292,7 +1385,6 @@ void CE_Output (const CodeEntry* E, FILE* F) /* Print the operand */ switch (E->AM) { - case AM_IMP: case AM65_IMP: /* implicit */ break; @@ -1302,13 +1394,11 @@ void CE_Output (const CodeEntry* E, FILE* F) Chars += fprintf (F, "%*sa", 9-Chars, ""); break; - case AM_IMM: case AM65_IMM: /* immidiate */ Chars += fprintf (F, "%*s#%s", 9-Chars, "", E->Arg); break; - case AM_ABS: case AM65_ZP: case AM65_ABS: /* zeropage and absolute */ @@ -1357,15 +1447,24 @@ void CE_Output (const CodeEntry* E, FILE* F) char Use [128]; char Chg [128]; fprintf (F, - "%*s; USE: %-12s CHG: %-12s SIZE: %u\n", + "%*s; USE: %-12s CHG: %-12s SIZE: %u", 30-Chars, "", - RegInfoDesc (E->Use, Use), - RegInfoDesc (E->Chg, Chg), + RegInfoDesc (E->Use, Use), + RegInfoDesc (E->Chg, Chg), E->Size); - } else { - /* Terminate the line */ - fprintf (F, "\n"); + + if (E->RI) { + char RegIn[32]; + char RegOut[32]; + fprintf (F, + " In %s Out %s", + RegContentDesc (&E->RI->In, RegIn), + RegContentDesc (&E->RI->Out, RegOut)); + } } + + /* Terminate the line */ + fprintf (F, "\n"); }