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Working on the backend
git-svn-id: svn://svn.cc65.org/cc65/trunk@770 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz
parent
d27bfe8a7b
commit
c1da7b8859
@ -296,6 +296,7 @@ void CE_Output (const CodeEntry* E, FILE* F)
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/* Print the operand */
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switch (E->AM) {
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case AM_IMP:
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case AM65_IMP:
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/* implicit */
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break;
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@ -305,11 +306,13 @@ void CE_Output (const CodeEntry* E, FILE* F)
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Chars += fprintf (F, "%*sa", 9-Chars, "");
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break;
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case AM65_IMM:
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case AM_IMM:
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case AM65_IMM:
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/* immidiate */
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Chars += fprintf (F, "%*s#%s", 9-Chars, "", E->Arg);
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break;
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case AM_ABS:
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case AM65_ZP:
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case AM65_ABS:
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/* zeropage and absolute */
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@ -375,4 +378,4 @@ void CE_Output (const CodeEntry* E, FILE* F)
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@ -130,6 +130,46 @@ static char* GetLabelName (unsigned flags, unsigned long label, unsigned offs)
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const char* NumToStr (long Val)
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/* Convert the given parameter converted to a string in a static buffer */
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{
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static char Buf [64];
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sprintf (Buf, "$%04X", (unsigned) (Val & 0xFFFF));
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return Buf;
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}
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const char* ByteToStr (unsigned Val)
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/* Convert the given byte parameter converted to a string in a static buffer */
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{
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static char Buf [16];
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sprintf (Buf, "$%02X", Val & 0xFF);
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return Buf;
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}
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const char* WordToStr (unsigned Val)
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/* Convert the given word parameter converted to a string in a static buffer */
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{
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static char Buf [16];
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sprintf (Buf, "$%04X", Val & 0xFFFF);
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return Buf;
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}
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const char* DWordToStr (unsigned long Val)
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/* Convert the given dword parameter converted to a string in a static buffer */
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{
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static char Buf [16];
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sprintf (Buf, "$%08lX", Val & 0xFFFFFFFF);
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return Buf;
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}
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/*****************************************************************************/
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/* Pre- and postamble */
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/*****************************************************************************/
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@ -435,7 +475,7 @@ void g_enter (unsigned flags, unsigned argsize)
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funcargs = argsize;
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} else {
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funcargs = -1;
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AddCodeLine ("jsr enter");
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AddCode (OPC_ENTER, AM_IMP, 0, 0);
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}
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}
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@ -453,29 +493,20 @@ void g_leave (void)
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/* Drop stackframe if needed */
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k += funcargs;
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if (k > 0) {
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if (k <= 8) {
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AddCodeLine ("jsr incsp%d", k);
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} else {
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CheckLocalOffs (k);
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ldyconst (k);
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AddCodeLine ("jsr addysp");
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}
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CheckLocalOffs (k);
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AddCode (OPC_SPACE, AM_IMM, NumToStr (-k), 0);
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}
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} else {
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if (k == 0) {
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/* Nothing to drop */
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AddCodeLine ("jsr leave");
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} else {
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/* We've a stack frame to drop */
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ldyconst (k);
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AddCodeLine ("jsr leavey");
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if (k > 0) {
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AddCode (OPC_SPACE, AM_IMM, NumToStr (-k), 0);
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}
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AddCode (OPC_LEAVE, AM_IMP, 0, 0);
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}
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/* Add the final rts */
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AddCodeLine ("rts");
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AddCode (OPC_RET, AM_IMP, 0, 0);
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}
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@ -565,7 +596,7 @@ void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
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/*****************************************************************************/
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/* Fetching memory cells */
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/* Fetching memory cells */
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/*****************************************************************************/
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@ -573,10 +604,6 @@ void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
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void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs)
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/* Load a constant into the primary register */
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{
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unsigned char B1, B2, B3, B4;
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unsigned Done;
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if ((Flags & CF_CONST) != 0) {
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/* Numeric constant */
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@ -584,56 +611,16 @@ void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs)
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case CF_CHAR:
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if ((Flags & CF_FORCECHAR) != 0) {
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ldaconst (Val);
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AddCode (OPC_LDA, AM_IMM, ByteToStr (Val), 0);
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break;
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}
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/* FALL THROUGH */
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case CF_INT:
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ldxconst ((Val >> 8) & 0xFF);
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ldaconst (Val & 0xFF);
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AddCode (OPC_LDAX, AM_IMM, WordToStr (Val), 0);
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break;
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case CF_LONG:
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/* Split the value into 4 bytes */
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B1 = (unsigned char) (Val >> 0);
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B2 = (unsigned char) (Val >> 8);
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B3 = (unsigned char) (Val >> 16);
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B4 = (unsigned char) (Val >> 24);
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/* Remember which bytes are done */
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Done = 0;
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/* Load the value */
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AddCodeLine ("ldx #$%02X", B2);
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Done |= 0x02;
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if (B2 == B3) {
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AddCodeLine ("stx sreg");
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Done |= 0x04;
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}
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if (B2 == B4) {
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AddCodeLine ("stx sreg+1");
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Done |= 0x08;
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}
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if ((Done & 0x04) == 0 && B1 != B3) {
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AddCodeLine ("lda #$%02X", B3);
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AddCodeLine ("sta sreg");
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Done |= 0x04;
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}
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if ((Done & 0x08) == 0 && B1 != B4) {
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AddCodeLine ("lda #$%02X", B4);
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AddCodeLine ("sta sreg+1");
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Done |= 0x08;
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}
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AddCodeLine ("lda #$%02X", B1);
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Done |= 0x01;
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if ((Done & 0x04) == 0) {
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CHECK (B1 == B3);
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AddCodeLine ("sta sreg");
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}
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if ((Done & 0x08) == 0) {
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CHECK (B1 == B4);
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AddCodeLine ("sta sreg+1");
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}
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AddCode (OPC_LDEAX, AM_IMM, DWordToStr (Val), 0);
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break;
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default:
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@ -644,12 +631,8 @@ void g_getimmed (unsigned Flags, unsigned long Val, unsigned Offs)
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} else {
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/* Some sort of label */
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const char* Label = GetLabelName (Flags, Val, Offs);
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/* Load the address into the primary */
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AddCodeLine ("lda #<(%s)", Label);
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AddCodeLine ("ldx #>(%s)", Label);
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/* Some sort of label, load it into the primary */
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AddCode (OPC_LEA, AM_ABS, GetLabelName (Flags, Val, Offs), 0);
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}
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}
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@ -867,33 +850,8 @@ void g_leasp (int offs)
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/* Calculate the offset relative to sp */
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offs -= oursp;
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/* For value 0 we do direct code */
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if (offs == 0) {
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AddCodeLine ("lda sp");
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AddCodeLine ("ldx sp+1");
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} else {
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if (CodeSizeFactor < 300) {
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ldaconst (offs); /* Load A with offset value */
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AddCodeLine ("jsr leaasp"); /* Load effective address */
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} else {
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unsigned L = GetLocalLabel ();
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if (CPU == CPU_65C02 && offs == 1) {
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AddCodeLine ("lda sp");
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AddCodeLine ("ldx sp+1");
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AddCodeLine ("ina");
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AddCodeLine ("bne %s", LocalLabelName (L));
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AddCodeLine ("inx");
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} else {
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ldaconst (offs);
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AddCodeLine ("clc");
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AddCodeLine ("ldx sp+1");
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AddCodeLine ("adc sp");
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AddCodeLine ("bcc %s", LocalLabelName (L));
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AddCodeLine ("inx");
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}
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g_defcodelabel (L);
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}
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}
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/* Output code */
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AddCode (OPC_LEA, AM_STACK, WordToStr (offs), 0);
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}
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@ -962,21 +920,15 @@ void g_putstatic (unsigned flags, unsigned long label, unsigned offs)
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switch (flags & CF_TYPE) {
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case CF_CHAR:
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AddCodeLine ("sta %s", lbuf);
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AddCode (OPC_STA, AM_ABS, lbuf, 0);
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break;
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case CF_INT:
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AddCodeLine ("sta %s", lbuf);
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AddCodeLine ("stx %s+1", lbuf);
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AddCode (OPC_STAX, AM_ABS, lbuf, 0);
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break;
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case CF_LONG:
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AddCodeLine ("sta %s", lbuf);
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AddCodeLine ("stx %s+1", lbuf);
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AddCodeLine ("ldy sreg");
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AddCodeLine ("sty %s+2", lbuf);
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AddCodeLine ("ldy sreg+1");
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AddCodeLine ("sty %s+3", lbuf);
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AddCode (OPC_STEAX, AM_ABS, lbuf, 0);
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break;
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default:
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@ -992,78 +944,23 @@ void g_putlocal (unsigned Flags, int Offs, long Val)
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{
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Offs -= oursp;
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CheckLocalOffs (Offs);
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if (Flags & CF_CONST) {
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g_getimmed (Flags, Val, Offs);
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}
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switch (Flags & CF_TYPE) {
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case CF_CHAR:
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if (Flags & CF_CONST) {
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AddCodeLine ("lda #$%02X", (unsigned char) Val);
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}
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if (CPU == CPU_65C02 && Offs == 0) {
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AddCodeLine ("sta (sp)");
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} else {
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ldyconst (Offs);
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AddCodeLine ("sta (sp),y");
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}
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AddCode (OPC_STA, AM_STACK, WordToStr (Offs), 0);
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break;
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case CF_INT:
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if (Flags & CF_CONST) {
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ldyconst (Offs+1);
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AddCodeLine ("lda #$%02X", (unsigned char) (Val >> 8));
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AddCodeLine ("sta (sp),y");
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if ((Flags & CF_NOKEEP) == 0) {
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/* Place high byte into X */
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AddCodeLine ("tax");
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}
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if (CPU == CPU_65C02 && Offs == 0) {
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AddCodeLine ("lda #$%02X", (unsigned char) Val);
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AddCodeLine ("sta (sp)");
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} else {
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if ((Val & 0xFF) == Offs+1) {
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/* The value we need is already in Y */
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AddCodeLine ("tya");
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AddCodeLine ("dey");
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} else {
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AddCodeLine ("dey");
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AddCodeLine ("lda #$%02X", (unsigned char) Val);
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}
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AddCodeLine ("sta (sp),y");
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}
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} else {
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if ((Flags & CF_NOKEEP) == 0 || CodeSizeFactor < 160) {
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if (Offs) {
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ldyconst (Offs);
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AddCodeLine ("jsr staxysp");
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} else {
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AddCodeLine ("jsr stax0sp");
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}
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} else {
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if (CPU == CPU_65C02 && Offs == 0) {
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AddCodeLine ("sta (sp)");
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ldyconst (1);
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AddCodeLine ("txa");
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AddCodeLine ("sta (sp),y");
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} else {
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ldyconst (Offs);
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AddCodeLine ("sta (sp),y");
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AddCodeLine ("iny");
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AddCodeLine ("txa");
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AddCodeLine ("sta (sp),y");
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}
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}
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}
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AddCode (OPC_STAX, AM_STACK, WordToStr (Offs), 0);
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break;
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case CF_LONG:
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if (Flags & CF_CONST) {
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g_getimmed (Flags, Val, 0);
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}
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if (Offs) {
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ldyconst (Offs);
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AddCodeLine ("jsr steaxysp");
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} else {
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AddCodeLine ("jsr steax0sp");
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}
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AddCode (OPC_STAEAX, AM_STACK, WordToStr (Offs), 0);
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break;
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default:
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@ -1563,28 +1460,6 @@ void g_addstatic (unsigned flags, unsigned long label, unsigned offs)
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/*****************************************************************************/
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/* Compares of ax with a variable with fixed address */
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/*****************************************************************************/
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void g_cmplocal (unsigned flags, int offs)
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/* Compare a local variable to ax */
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{
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Internal ("g_cmplocal not implemented");
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}
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void g_cmpstatic (unsigned flags, unsigned label, unsigned offs)
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/* Compare a static variable to ax */
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{
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Internal ("g_cmpstatic not implemented");
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}
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/*****************************************************************************/
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/* Special op= functions */
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/*****************************************************************************/
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