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cc65/src/cc65/codegen.c

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/*****************************************************************************/
/* */
/* codegen.c */
/* */
/* 6502 code generator */
/* */
/* */
/* */
/* (C) 1998-2013, Ullrich von Bassewitz */
/* Roemerstrasse 52 */
/* D-70794 Filderstadt */
/* 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. */
/* */
/*****************************************************************************/
#include <inttypes.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <stdarg.h>
/* common */
#include "addrsize.h"
#include "check.h"
#include "cpu.h"
#include "shift.h"
#include "strbuf.h"
#include "xmalloc.h"
#include "xsprintf.h"
#include "version.h"
/* cc65 */
#include "asmcode.h"
#include "asmlabel.h"
#include "casenode.h"
#include "codeseg.h"
#include "dataseg.h"
#include "error.h"
#include "global.h"
#include "segments.h"
#include "stackptr.h"
#include "stdfunc.h"
#include "textseg.h"
#include "util.h"
#include "codegen.h"
/*****************************************************************************/
/* Helpers */
/*****************************************************************************/
static void typeerror (unsigned type)
/* Print an error message about an invalid operand type */
{
/* Special handling for floats here: */
if ((type & CF_TYPEMASK) == CF_FLOAT) {
Fatal ("Floating point type is currently unsupported");
} else {
Internal ("Invalid type in CF flags: %04X, type = %u", type, type & CF_TYPEMASK);
}
}
static void CheckLocalOffs (unsigned Offs)
/* Check the offset into the stack for 8bit range */
{
if (Offs >= 256) {
/* Too many local vars */
Error ("Too many local variables");
}
}
static const char* GetLabelName (unsigned Flags, uintptr_t Label, long Offs)
{
static char Buf [256]; /* Label name */
/* Create the correct label name */
switch (Flags & CF_ADDRMASK) {
case CF_IMM:
/* Immediate constant values */
xsprintf (Buf, sizeof (Buf), "$%04X", (unsigned)((Offs) & 0xFFFF));
break;
case CF_STATIC:
/* Local static memory cell */
if (Offs) {
xsprintf (Buf, sizeof (Buf), "%s%+ld", LocalDataLabelName (Label), Offs);
} else {
xsprintf (Buf, sizeof (Buf), "%s", LocalDataLabelName (Label));
}
break;
case CF_EXTERNAL:
/* External label */
if (Offs) {
xsprintf (Buf, sizeof (Buf), "_%s%+ld", (char*) Label, Offs);
} else {
xsprintf (Buf, sizeof (Buf), "_%s", (char*) Label);
}
break;
case CF_LITERAL:
/* Literal */
/* Static memory cell */
if (Offs) {
xsprintf (Buf, sizeof (Buf), "%s%+ld", PooledLiteralLabelName (Label), Offs);
} else {
xsprintf (Buf, sizeof (Buf), "%s", PooledLiteralLabelName (Label));
}
break;
case CF_ABSOLUTE:
/* Absolute address */
xsprintf (Buf, sizeof (Buf), "$%04X", (unsigned)((Label+Offs) & 0xFFFF));
break;
case CF_REGVAR:
/* Variable in register bank */
xsprintf (Buf, sizeof (Buf), "regbank+%u", (unsigned)((Label+Offs) & 0xFFFF));
break;
case CF_CODE:
/* Code label location */
if (Offs) {
xsprintf (Buf, sizeof (Buf), "%s%+ld", LocalLabelName (Label), Offs);
} else {
xsprintf (Buf, sizeof (Buf), "%s", LocalLabelName (Label));
}
break;
default:
Internal ("Invalid address flags: %04X", Flags);
}
/* Return a pointer to the static buffer */
return Buf;
}
/*****************************************************************************/
/* Pre- and postamble */
/*****************************************************************************/
void g_preamble (void)
/* Generate the assembler code preamble */
{
/* Identify the compiler version */
AddTextLine (";");
AddTextLine ("; File generated by cc65 v %s", GetVersionAsString ());
AddTextLine (";");
/* Insert some object file options */
AddTextLine ("\t.fopt\t\tcompiler,\"cc65 v %s\"",
GetVersionAsString ());
/* If we're producing code for some other CPU, switch the command set */
switch (CPU) {
case CPU_6502: AddTextLine ("\t.setcpu\t\t\"6502\""); break;
case CPU_6502X: AddTextLine ("\t.setcpu\t\t\"6502X\""); break;
case CPU_6502DTV: AddTextLine ("\t.setcpu\t\t\"6502DTV\""); break;
case CPU_65SC02: AddTextLine ("\t.setcpu\t\t\"65SC02\""); break;
case CPU_65C02: AddTextLine ("\t.setcpu\t\t\"65C02\""); break;
case CPU_65816: AddTextLine ("\t.setcpu\t\t\"65816\""); break;
case CPU_HUC6280: AddTextLine ("\t.setcpu\t\t\"HUC6280\""); break;
default: Internal ("Unknown CPU: %d", CPU);
}
/* Use smart mode */
AddTextLine ("\t.smart\t\ton");
/* Allow auto import for runtime library routines */
AddTextLine ("\t.autoimport\ton");
/* Switch the assembler into case sensitive mode */
AddTextLine ("\t.case\t\ton");
/* Tell the assembler if we want to generate debug info */
AddTextLine ("\t.debuginfo\t%s", (DebugInfo != 0)? "on" : "off");
/* Import zero page variables */
AddTextLine ("\t.importzp\tsp, sreg, regsave, regbank");
AddTextLine ("\t.importzp\ttmp1, tmp2, tmp3, tmp4, ptr1, ptr2, ptr3, ptr4");
/* Define long branch macros */
AddTextLine ("\t.macpack\tlongbranch");
}
void g_fileinfo (const char* Name, unsigned long Size, unsigned long MTime)
/* If debug info is enabled, place a file info into the source */
{
if (DebugInfo) {
/* We have to place this into the global text segment, so it will
** appear before all .dbg line statements.
*/
TS_AddLine (GS->Text, "\t.dbg\t\tfile, \"%s\", %lu, %lu", Name, Size, MTime);
}
}
/*****************************************************************************/
/* Segment support */
/*****************************************************************************/
void g_userodata (void)
/* Switch to the read only data segment */
{
UseDataSeg (SEG_RODATA);
}
void g_usedata (void)
/* Switch to the data segment */
{
UseDataSeg (SEG_DATA);
}
void g_usebss (void)
/* Switch to the bss segment */
{
UseDataSeg (SEG_BSS);
}
void g_segname (segment_t Seg)
/* Emit the name of a segment if necessary */
{
unsigned char AddrSize;
const char* Name;
/* Emit a segment directive for the data style segments */
DataSeg* S;
switch (Seg) {
case SEG_RODATA: S = CS->ROData; break;
case SEG_DATA: S = CS->Data; break;
case SEG_BSS: S = CS->BSS; break;
default: S = 0; break;
}
if (S) {
Name = GetSegName (Seg);
AddrSize = GetSegAddrSize (Name);
if (AddrSize != ADDR_SIZE_INVALID) {
DS_AddLine (S, ".segment\t\"%s\": %s", Name, AddrSizeToStr (AddrSize));
} else {
DS_AddLine (S, ".segment\t\"%s\"", Name);
}
}
}
/*****************************************************************************/
/* Code */
/*****************************************************************************/
unsigned sizeofarg (unsigned flags)
/* Return the size of a function argument type that is encoded in flags */
{
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
return (flags & CF_FORCECHAR)? 1 : 2;
case CF_INT:
return 2;
case CF_LONG:
return 4;
case CF_FLOAT:
return 4;
default:
typeerror (flags);
/* NOTREACHED */
return 2;
}
}
int pop (unsigned flags)
/* Pop an argument of the given size */
{
return StackPtr += sizeofarg (flags);
}
int push (unsigned flags)
/* Push an argument of the given size */
{
return StackPtr -= sizeofarg (flags);
}
static unsigned MakeByteOffs (unsigned Flags, unsigned Offs)
/* The value in Offs is an offset to an address in a/x. Make sure, an object
** of the type given in Flags can be loaded or stored into this address by
** adding part of the offset to the address in ax, so that the remaining
** offset fits into an index register. Return the remaining offset.
*/
{
/* If the offset is too large for a byte register, add the high byte
** of the offset to the primary. Beware: We need a special correction
** if the offset in the low byte will overflow in the operation.
*/
unsigned O = Offs & ~0xFFU;
if ((Offs & 0xFF) > 256 - sizeofarg (Flags)) {
/* We need to add the low byte also */
O += Offs & 0xFF;
}
/* Do the correction if we need one */
if (O != 0) {
g_inc (CF_INT | CF_CONST, O);
Offs -= O;
}
/* Return the new offset */
return Offs;
}
/*****************************************************************************/
/* Functions handling local labels */
/*****************************************************************************/
void g_defcodelabel (unsigned label)
/* Define a local code label */
{
CS_AddLabel (CS->Code, LocalLabelName (label));
}
void g_defdatalabel (unsigned label)
/* Define a local data label */
{
AddDataLine ("%s:", LocalDataLabelName (label));
}
/*****************************************************************************/
/* Functions handling global labels */
/*****************************************************************************/
void g_defgloblabel (const char* Name)
/* Define a global label with the given name */
{
/* Global labels are always data labels */
AddDataLine ("_%s:", Name);
}
void g_defliterallabel (unsigned label)
/* Define a literal data label */
{
/* Literal labels are always data labels */
AddDataLine ("%s:", PooledLiteralLabelName (label));
}
void g_aliasliterallabel (unsigned label, unsigned baselabel, long offs)
/* Define label as an alias for baselabel+offs */
{
/* We need an intermediate buffer here since LocalLabelName uses a
** static buffer which changes with each call.
*/
StrBuf L = AUTO_STRBUF_INITIALIZER;
SB_AppendStr (&L, PooledLiteralLabelName (label));
SB_Terminate (&L);
AddDataLine ("%s\t:=\t%s+%ld",
SB_GetConstBuf (&L),
PooledLiteralLabelName (baselabel),
offs);
SB_Done (&L);
}
void g_defexport (const char* Name, int ZP)
/* Export the given label */
{
if (ZP) {
AddTextLine ("\t.exportzp\t_%s", Name);
} else {
AddTextLine ("\t.export\t\t_%s", Name);
}
}
void g_defimport (const char* Name, int ZP)
/* Import the given label */
{
if (ZP) {
AddTextLine ("\t.importzp\t_%s", Name);
} else {
AddTextLine ("\t.import\t\t_%s", Name);
}
}
void g_importstartup (void)
/* Forced import of the startup module */
{
AddTextLine ("\t.forceimport\t__STARTUP__");
}
void g_importmainargs (void)
/* Forced import of a special symbol that handles arguments to main. This will
happen only when the compiler sees a main function that takes arguments. */
{
AddTextLine ("\t.forceimport\tinitmainargs");
}
/*****************************************************************************/
/* Function entry and exit */
/*****************************************************************************/
/* Remember the argument size of a function. The variable is set by g_enter
** and used by g_leave. If the function gets its argument size by the caller
** (variable param list or function without prototype), g_enter will set the
** value to -1.
*/
static int funcargs;
void g_enter (unsigned flags, unsigned argsize)
/* Function prologue */
{
if ((flags & CF_FIXARGC) != 0) {
/* Just remember the argument size for the leave */
funcargs = argsize;
} else {
funcargs = -1;
AddCodeLine ("jsr enter");
}
}
void g_leave (void)
/* Function epilogue */
{
/* How many bytes of locals do we have to drop? */
unsigned ToDrop = (unsigned) -StackPtr;
/* If we didn't have a variable argument list, don't call leave */
if (funcargs >= 0) {
/* Drop stackframe if needed */
g_drop (ToDrop + funcargs);
} else if (StackPtr != 0) {
/* We've a stack frame to drop */
if (ToDrop > 255) {
g_drop (ToDrop); /* Inlines the code */
AddCodeLine ("jsr leave");
} else {
AddCodeLine ("ldy #$%02X", ToDrop);
AddCodeLine ("jsr leavey");
}
} else {
/* Nothing to drop */
AddCodeLine ("jsr leave");
}
/* Add the final rts */
AddCodeLine ("rts");
}
/*****************************************************************************/
/* Register variables */
/*****************************************************************************/
void g_swap_regvars (int StackOffs, int RegOffs, unsigned Bytes)
/* Swap a register variable with a location on the stack */
{
/* Calculate the actual stack offset and check it */
StackOffs -= StackPtr;
CheckLocalOffs (StackOffs);
/* Generate code */
AddCodeLine ("ldy #$%02X", StackOffs & 0xFF);
if (Bytes == 1) {
if (IS_Get (&CodeSizeFactor) < 165) {
AddCodeLine ("ldx #$%02X", RegOffs & 0xFF);
AddCodeLine ("jsr regswap1");
} else {
AddCodeLine ("lda (sp),y");
AddCodeLine ("ldx regbank%+d", RegOffs);
AddCodeLine ("sta regbank%+d", RegOffs);
AddCodeLine ("txa");
AddCodeLine ("sta (sp),y");
}
} else if (Bytes == 2) {
AddCodeLine ("ldx #$%02X", RegOffs & 0xFF);
AddCodeLine ("jsr regswap2");
} else {
AddCodeLine ("ldx #$%02X", RegOffs & 0xFF);
AddCodeLine ("lda #$%02X", Bytes & 0xFF);
AddCodeLine ("jsr regswap");
}
}
void g_save_regvars (int RegOffs, unsigned Bytes)
/* Save register variables */
{
/* Don't loop for up to two bytes */
if (Bytes == 1) {
AddCodeLine ("lda regbank%+d", RegOffs);
AddCodeLine ("jsr pusha");
} else if (Bytes == 2) {
AddCodeLine ("lda regbank%+d", RegOffs);
AddCodeLine ("ldx regbank%+d", RegOffs+1);
AddCodeLine ("jsr pushax");
} else {
/* More than two bytes - loop */
unsigned Label = GetLocalLabel ();
g_space (Bytes);
AddCodeLine ("ldy #$%02X", (unsigned char) (Bytes - 1));
AddCodeLine ("ldx #$%02X", (unsigned char) Bytes);
g_defcodelabel (Label);
AddCodeLine ("lda regbank%+d,x", RegOffs-1);
AddCodeLine ("sta (sp),y");
AddCodeLine ("dey");
AddCodeLine ("dex");
AddCodeLine ("bne %s", LocalLabelName (Label));
}
/* We pushed stuff, correct the stack pointer */
StackPtr -= Bytes;
}
void g_restore_regvars (int StackOffs, int RegOffs, unsigned Bytes)
/* Restore register variables */
{
/* Calculate the actual stack offset and check it */
StackOffs -= StackPtr;
CheckLocalOffs (StackOffs);
/* Don't loop for up to two bytes */
if (Bytes == 1) {
AddCodeLine ("ldy #$%02X", StackOffs);
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d", RegOffs);
} else if (Bytes == 2) {
AddCodeLine ("ldy #$%02X", StackOffs);
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d", RegOffs);
AddCodeLine ("iny");
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d", RegOffs+1);
} else if (Bytes == 3 && IS_Get (&CodeSizeFactor) >= 133) {
AddCodeLine ("ldy #$%02X", StackOffs);
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d", RegOffs);
AddCodeLine ("iny");
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d", RegOffs+1);
AddCodeLine ("iny");
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d", RegOffs+2);
} else if (StackOffs <= RegOffs) {
/* More bytes, but the relation between the register offset in the
** register bank and the stack offset allows us to generate short
** code that uses just one index register.
*/
unsigned Label = GetLocalLabel ();
AddCodeLine ("ldy #$%02X", StackOffs);
g_defcodelabel (Label);
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d,y", RegOffs - StackOffs);
AddCodeLine ("iny");
AddCodeLine ("cpy #$%02X", StackOffs + Bytes);
AddCodeLine ("bne %s", LocalLabelName (Label));
} else {
/* OK, this is the generic code. We need to save X because the
** caller will only save A.
*/
unsigned Label = GetLocalLabel ();
AddCodeLine ("stx tmp1");
AddCodeLine ("ldy #$%02X", (unsigned char) (StackOffs + Bytes - 1));
AddCodeLine ("ldx #$%02X", (unsigned char) (Bytes - 1));
g_defcodelabel (Label);
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta regbank%+d,x", RegOffs);
AddCodeLine ("dey");
AddCodeLine ("dex");
AddCodeLine ("bpl %s", LocalLabelName (Label));
AddCodeLine ("ldx tmp1");
}
}
/*****************************************************************************/
/* Fetching memory cells */
/*****************************************************************************/
void g_getimmed (unsigned Flags, uintptr_t Val, long Offs)
/* Load a constant into the primary register */
{
unsigned char B1, B2, B3, B4;
unsigned Done;
if ((Flags & CF_CONST) != 0) {
/* Numeric constant */
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if ((Flags & CF_FORCECHAR) != 0) {
AddCodeLine ("lda #$%02X", (unsigned char) Val);
break;
}
/* FALL THROUGH */
case CF_INT:
AddCodeLine ("ldx #$%02X", (unsigned char) (Val >> 8));
AddCodeLine ("lda #$%02X", (unsigned char) Val);
break;
case CF_LONG:
/* Split the value into 4 bytes */
B1 = (unsigned char) (Val >> 0);
B2 = (unsigned char) (Val >> 8);
B3 = (unsigned char) (Val >> 16);
B4 = (unsigned char) (Val >> 24);
/* Remember which bytes are done */
Done = 0;
/* Load the value */
AddCodeLine ("ldx #$%02X", B2);
Done |= 0x02;
if (B2 == B3) {
AddCodeLine ("stx sreg");
Done |= 0x04;
}
if (B2 == B4) {
AddCodeLine ("stx sreg+1");
Done |= 0x08;
}
if ((Done & 0x04) == 0 && B1 != B3) {
AddCodeLine ("lda #$%02X", B3);
AddCodeLine ("sta sreg");
Done |= 0x04;
}
if ((Done & 0x08) == 0 && B1 != B4) {
AddCodeLine ("lda #$%02X", B4);
AddCodeLine ("sta sreg+1");
Done |= 0x08;
}
AddCodeLine ("lda #$%02X", B1);
Done |= 0x01;
if ((Done & 0x04) == 0) {
CHECK (B1 == B3);
AddCodeLine ("sta sreg");
}
if ((Done & 0x08) == 0) {
CHECK (B1 == B4);
AddCodeLine ("sta sreg+1");
}
break;
default:
typeerror (Flags);
break;
}
} else {
/* Some sort of label */
const char* Label = GetLabelName (Flags, Val, Offs);
/* Load the address into the primary */
AddCodeLine ("lda #<(%s)", Label);
AddCodeLine ("ldx #>(%s)", Label);
}
}
void g_getstatic (unsigned flags, uintptr_t label, long offs)
/* Fetch an static memory cell into the primary register */
{
/* Create the correct label name */
const char* lbuf = GetLabelName (flags, label, offs);
/* Check the size and generate the correct load operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if ((flags & CF_FORCECHAR) || (flags & CF_TEST)) {
AddCodeLine ("lda %s", lbuf); /* load A from the label */
} else {
AddCodeLine ("ldx #$00");
AddCodeLine ("lda %s", lbuf); /* load A from the label */
if (!(flags & CF_UNSIGNED)) {
/* Must sign extend */
unsigned L = GetLocalLabel ();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
}
break;
case CF_INT:
AddCodeLine ("lda %s", lbuf);
if (flags & CF_TEST) {
AddCodeLine ("ora %s+1", lbuf);
} else {
AddCodeLine ("ldx %s+1", lbuf);
}
break;
case CF_LONG:
if (flags & CF_TEST) {
AddCodeLine ("lda %s+3", lbuf);
AddCodeLine ("ora %s+2", lbuf);
AddCodeLine ("ora %s+1", lbuf);
AddCodeLine ("ora %s+0", lbuf);
} else {
AddCodeLine ("lda %s+3", lbuf);
AddCodeLine ("sta sreg+1");
AddCodeLine ("lda %s+2", lbuf);
AddCodeLine ("sta sreg");
AddCodeLine ("ldx %s+1", lbuf);
AddCodeLine ("lda %s", lbuf);
}
break;
default:
typeerror (flags);
}
}
void g_getlocal (unsigned Flags, int Offs)
/* Fetch specified local object (local var). */
{
Offs -= StackPtr;
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
CheckLocalOffs (Offs);
if ((Flags & CF_FORCECHAR) || (Flags & CF_TEST)) {
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("lda (sp),y");
} else {
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("ldx #$00");
AddCodeLine ("lda (sp),y");
if ((Flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
}
break;
case CF_INT:
CheckLocalOffs (Offs + 1);
AddCodeLine ("ldy #$%02X", (unsigned char) (Offs+1));
if (Flags & CF_TEST) {
AddCodeLine ("lda (sp),y");
AddCodeLine ("dey");
AddCodeLine ("ora (sp),y");
} else {
AddCodeLine ("jsr ldaxysp");
}
break;
case CF_LONG:
CheckLocalOffs (Offs + 3);
AddCodeLine ("ldy #$%02X", (unsigned char) (Offs+3));
AddCodeLine ("jsr ldeaxysp");
if (Flags & CF_TEST) {
g_test (Flags);
}
break;
default:
typeerror (Flags);
}
}
void g_getind (unsigned Flags, unsigned Offs)
/* Fetch the specified object type indirect through the primary register
** into the primary register
*/
{
/* If the offset is greater than 255, add the part that is > 255 to
** the primary. This way we get an easy addition and use the low byte
** as the offset
*/
Offs = MakeByteOffs (Flags, Offs);
/* Handle the indirect fetch */
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
/* Character sized */
AddCodeLine ("ldy #$%02X", Offs);
if (Flags & CF_UNSIGNED) {
AddCodeLine ("jsr ldauidx");
} else {
AddCodeLine ("jsr ldaidx");
}
break;
case CF_INT:
if (Flags & CF_TEST) {
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("sta ptr1");
AddCodeLine ("stx ptr1+1");
AddCodeLine ("lda (ptr1),y");
AddCodeLine ("iny");
AddCodeLine ("ora (ptr1),y");
} else {
AddCodeLine ("ldy #$%02X", Offs+1);
AddCodeLine ("jsr ldaxidx");
}
break;
case CF_LONG:
AddCodeLine ("ldy #$%02X", Offs+3);
AddCodeLine ("jsr ldeaxidx");
if (Flags & CF_TEST) {
g_test (Flags);
}
break;
default:
typeerror (Flags);
}
}
void g_leasp (int Offs)
/* Fetch the address of the specified symbol into the primary register */
{
unsigned char Lo, Hi;
/* Calculate the offset relative to sp */
Offs -= StackPtr;
/* Get low and high byte */
Lo = (unsigned char) Offs;
Hi = (unsigned char) (Offs >> 8);
/* Generate code */
if (Lo == 0) {
if (Hi <= 3) {
AddCodeLine ("lda sp");
AddCodeLine ("ldx sp+1");
while (Hi--) {
AddCodeLine ("inx");
}
} else {
AddCodeLine ("lda sp+1");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", Hi);
AddCodeLine ("tax");
AddCodeLine ("lda sp");
}
} else if (Hi == 0) {
/* 8 bit offset */
if (IS_Get (&CodeSizeFactor) < 200) {
/* 8 bit offset with subroutine call */
AddCodeLine ("lda #$%02X", Lo);
AddCodeLine ("jsr leaa0sp");
} else {
/* 8 bit offset inlined */
unsigned L = GetLocalLabel ();
AddCodeLine ("lda sp");
AddCodeLine ("ldx sp+1");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", Lo);
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
}
} else if (IS_Get (&CodeSizeFactor) < 170) {
/* Full 16 bit offset with subroutine call */
AddCodeLine ("lda #$%02X", Lo);
AddCodeLine ("ldx #$%02X", Hi);
AddCodeLine ("jsr leaaxsp");
} else {
/* Full 16 bit offset inlined */
AddCodeLine ("lda sp");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", Lo);
AddCodeLine ("pha");
AddCodeLine ("lda sp+1");
AddCodeLine ("adc #$%02X", Hi);
AddCodeLine ("tax");
AddCodeLine ("pla");
}
}
void g_leavariadic (int Offs)
/* Fetch the address of a parameter in a variadic function into the primary
** register
*/
{
unsigned ArgSizeOffs;
/* Calculate the offset relative to sp */
Offs -= StackPtr;
/* Get the offset of the parameter which is stored at sp+0 on function
** entry and check if this offset is reachable with a byte offset.
*/
CHECK (StackPtr <= 0);
ArgSizeOffs = -StackPtr;
CheckLocalOffs (ArgSizeOffs);
/* Get the size of all parameters. */
AddCodeLine ("ldy #$%02X", ArgSizeOffs);
AddCodeLine ("lda (sp),y");
/* Add the value of the stackpointer */
if (IS_Get (&CodeSizeFactor) > 250) {
unsigned L = GetLocalLabel();
AddCodeLine ("ldx sp+1");
AddCodeLine ("clc");
AddCodeLine ("adc sp");
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
} else {
AddCodeLine ("ldx #$00");
AddCodeLine ("jsr leaaxsp");
}
/* Add the offset to the primary */
if (Offs > 0) {
g_inc (CF_INT | CF_CONST, Offs);
} else if (Offs < 0) {
g_dec (CF_INT | CF_CONST, -Offs);
}
}
/*****************************************************************************/
/* Store into memory */
/*****************************************************************************/
void g_putstatic (unsigned flags, uintptr_t label, long offs)
/* Store the primary register into the specified static memory cell */
{
/* Create the correct label name */
const char* lbuf = GetLabelName (flags, label, offs);
/* Check the size and generate the correct store operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
AddCodeLine ("sta %s", lbuf);
break;
case CF_INT:
AddCodeLine ("sta %s", lbuf);
AddCodeLine ("stx %s+1", lbuf);
break;
case CF_LONG:
AddCodeLine ("sta %s", lbuf);
AddCodeLine ("stx %s+1", lbuf);
AddCodeLine ("ldy sreg");
AddCodeLine ("sty %s+2", lbuf);
AddCodeLine ("ldy sreg+1");
AddCodeLine ("sty %s+3", lbuf);
break;
default:
typeerror (flags);
}
}
void g_putlocal (unsigned Flags, int Offs, long Val)
/* Put data into local object. */
{
Offs -= StackPtr;
CheckLocalOffs (Offs);
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if (Flags & CF_CONST) {
AddCodeLine ("lda #$%02X", (unsigned char) Val);
}
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("sta (sp),y");
break;
case CF_INT:
if (Flags & CF_CONST) {
AddCodeLine ("ldy #$%02X", Offs+1);
AddCodeLine ("lda #$%02X", (unsigned char) (Val >> 8));
AddCodeLine ("sta (sp),y");
if ((Flags & CF_NOKEEP) == 0) {
/* Place high byte into X */
AddCodeLine ("tax");
}
if ((Val & 0xFF) == Offs+1) {
/* The value we need is already in Y */
AddCodeLine ("tya");
AddCodeLine ("dey");
} else {
AddCodeLine ("dey");
AddCodeLine ("lda #$%02X", (unsigned char) Val);
}
AddCodeLine ("sta (sp),y");
} else {
AddCodeLine ("ldy #$%02X", Offs);
if ((Flags & CF_NOKEEP) == 0 || IS_Get (&CodeSizeFactor) < 160) {
AddCodeLine ("jsr staxysp");
} else {
AddCodeLine ("sta (sp),y");
AddCodeLine ("iny");
AddCodeLine ("txa");
AddCodeLine ("sta (sp),y");
}
}
break;
case CF_LONG:
if (Flags & CF_CONST) {
g_getimmed (Flags, Val, 0);
}
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("jsr steaxysp");
break;
default:
typeerror (Flags);
}
}
void g_putind (unsigned Flags, unsigned Offs)
/* Store the specified object type in the primary register at the address
** on the top of the stack
*/
{
/* We can handle offsets below $100 directly, larger offsets must be added
** to the address. Since a/x is in use, best code is achieved by adding
** just the high byte. Be sure to check if the low byte will overflow while
** while storing.
*/
if ((Offs & 0xFF) > 256 - sizeofarg (Flags | CF_FORCECHAR)) {
/* Overflow - we need to add the low byte also */
AddCodeLine ("ldy #$00");
AddCodeLine ("clc");
if ((Flags & CF_NOKEEP) == 0) {
AddCodeLine ("pha");
}
AddCodeLine ("lda #$%02X", Offs & 0xFF);
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
AddCodeLine ("iny");
AddCodeLine ("lda #$%02X", (Offs >> 8) & 0xFF);
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
if ((Flags & CF_NOKEEP) == 0) {
AddCodeLine ("pla");
}
/* Complete address is on stack, new offset is zero */
Offs = 0;
} else if ((Offs & 0xFF00) != 0) {
/* We can just add the high byte */
AddCodeLine ("ldy #$01");
AddCodeLine ("clc");
if ((Flags & CF_NOKEEP) == 0) {
AddCodeLine ("pha");
}
AddCodeLine ("lda #$%02X", (Offs >> 8) & 0xFF);
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
if ((Flags & CF_NOKEEP) == 0) {
AddCodeLine ("pla");
}
/* Offset is now just the low byte */
Offs &= 0x00FF;
}
/* Check the size and determine operation */
AddCodeLine ("ldy #$%02X", Offs);
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
AddCodeLine ("jsr staspidx");
break;
case CF_INT:
AddCodeLine ("jsr staxspidx");
break;
case CF_LONG:
AddCodeLine ("jsr steaxspidx");
break;
default:
typeerror (Flags);
}
/* Pop the argument which is always a pointer */
pop (CF_PTR);
}
/*****************************************************************************/
/* type conversion and similiar stuff */
/*****************************************************************************/
void g_toslong (unsigned flags)
/* Make sure, the value on TOS is a long. Convert if necessary */
{
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
case CF_INT:
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr tosulong");
} else {
AddCodeLine ("jsr toslong");
}
push (CF_INT);
break;
case CF_LONG:
break;
default:
typeerror (flags);
}
}
void g_tosint (unsigned flags)
/* Make sure, the value on TOS is an int. Convert if necessary */
{
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
case CF_INT:
break;
case CF_LONG:
AddCodeLine ("jsr tosint");
pop (CF_INT);
break;
default:
typeerror (flags);
}
}
static void g_regchar (unsigned Flags)
/* Make sure, the value in the primary register is in the range of char. Truncate if necessary */
{
unsigned L;
AddCodeLine ("ldx #$00");
if ((Flags & CF_UNSIGNED) == 0) {
/* Sign extend */
L = GetLocalLabel();
AddCodeLine ("cmp #$80");
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
}
void g_regint (unsigned Flags)
/* Make sure, the value in the primary register an int. Convert if necessary */
{
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if (Flags & CF_FORCECHAR) {
/* Conversion is from char */
g_regchar (Flags);
}
/* FALLTHROUGH */
case CF_INT:
case CF_LONG:
break;
default:
typeerror (Flags);
}
}
void g_reglong (unsigned Flags)
/* Make sure, the value in the primary register a long. Convert if necessary */
{
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if (Flags & CF_FORCECHAR) {
/* Conversion is from char */
if (Flags & CF_UNSIGNED) {
if (IS_Get (&CodeSizeFactor) >= 200) {
AddCodeLine ("ldx #$00");
AddCodeLine ("stx sreg");
AddCodeLine ("stx sreg+1");
} else {
AddCodeLine ("jsr aulong");
}
} else {
if (IS_Get (&CodeSizeFactor) >= 366) {
g_regchar (Flags);
AddCodeLine ("stx sreg");
AddCodeLine ("stx sreg+1");
} else {
AddCodeLine ("jsr along");
}
}
}
/* FALLTHROUGH */
case CF_INT:
if (Flags & CF_UNSIGNED) {
if (IS_Get (&CodeSizeFactor) >= 200) {
AddCodeLine ("ldy #$00");
AddCodeLine ("sty sreg");
AddCodeLine ("sty sreg+1");
} else {
AddCodeLine ("jsr axulong");
}
} else {
AddCodeLine ("jsr axlong");
}
break;
case CF_LONG:
break;
default:
typeerror (Flags);
}
}
static unsigned g_intpromotion (unsigned flags)
/* Return new flags for integral promotions for types smaller than int. */
{
/* https://port70.net/~nsz/c/c89/c89-draft.html#3.2.1.1
** A char, a short int, or an int bit-field, or their signed or unsigned varieties, or an
** object that has enumeration type, may be used in an expression wherever an int or
** unsigned int may be used. If an int can represent all values of the original type, the value
** is converted to an int; otherwise it is converted to an unsigned int.
** These are called the integral promotions.
*/
if ((flags & CF_TYPEMASK) == CF_CHAR) {
/* int can represent all unsigned chars, so unsigned char is promoted to int. */
flags &= ~CF_TYPEMASK;
flags &= ~CF_UNSIGNED;
flags |= CF_INT;
return flags;
} else if ((flags & CF_TYPEMASK) == CF_SHORT) {
/* int cannot represent all unsigned shorts, so unsigned short is promoted to
** unsigned int.
*/
flags &= ~CF_TYPEMASK;
flags |= CF_INT;
return flags;
} else {
/* Otherwise, the type is not smaller than int, so leave it alone. */
return flags;
}
}
unsigned g_typeadjust (unsigned lhs, unsigned rhs)
/* Adjust the integer operands before doing a binary operation. lhs is a flags
** value, that corresponds to the value on TOS, rhs corresponds to the value
** in (e)ax. The return value is the flags value for the resulting type.
*/
{
/* Get the type spec from the flags */
unsigned ltype = lhs & CF_TYPEMASK;
unsigned rtype = rhs & CF_TYPEMASK;
/* Check if a conversion is needed */
if (ltype == CF_LONG && rtype != CF_LONG && (rhs & CF_CONST) == 0) {
/* We must promote the primary register to long */
g_reglong (rhs);
} else if (ltype != CF_LONG && (lhs & CF_CONST) == 0 && rtype == CF_LONG) {
/* We must promote the lhs to long */
if (lhs & CF_PRIMARY) {
g_reglong (lhs);
} else {
g_toslong (lhs);
}
}
/* Result is const if both operands are const. */
unsigned const_flag = (lhs & CF_CONST) & (rhs & CF_CONST);
/* https://port70.net/~nsz/c/c89/c89-draft.html#3.2.1.5
** Many binary operators that expect operands of arithmetic type cause conversions and yield
** result types in a similar way. The purpose is to yield a common type, which is also the type
** of the result. This pattern is called the usual arithmetic conversions.
*/
/* Note that this logic is largely duplicated by ArithmeticConvert. */
/* Before we apply the integral promotions, we check if both types are the same character type.
** If so, we return that type, rather than int, which would be returned by the standard
** rules. This is only a performance optimization allowing the use of unsigned and/or char
** operations; it does not affect correctness, as the flags are only used for code generation,
** and not to determine types of other expressions containing this one. For codgen, CF_CHAR
** means the operands are char and the result is int (unless CF_FORCECHAR is also set, in
** which case the result is char). This special case part is not duplicated by
** ArithmeticConvert.
*/
if ((lhs & CF_TYPEMASK) == CF_CHAR && (rhs & CF_TYPEMASK) == CF_CHAR &&
(lhs & CF_UNSIGNED) == (rhs & CF_UNSIGNED)) {
/* Signedness flags are the same, so just use one of them. */
const unsigned unsigned_flag = lhs & CF_UNSIGNED;
return const_flag | unsigned_flag | CF_CHAR;
}
/* Apply integral promotions for types char/short. */
lhs = g_intpromotion (lhs);
rhs = g_intpromotion (rhs);
ltype = lhs & CF_TYPEMASK;
rtype = rhs & CF_TYPEMASK;
/* If either operand has type unsigned long int, the other operand is converted to
** unsigned long int.
*/
if ((ltype == CF_LONG && (lhs & CF_UNSIGNED)) ||
(rtype == CF_LONG && (rhs & CF_UNSIGNED))) {
return const_flag | CF_UNSIGNED | CF_LONG;
}
/* Otherwise, if one operand has type long int and the other has type unsigned int,
** if a long int can represent all values of an unsigned int, the operand of type unsigned int
** is converted to long int ; if a long int cannot represent all the values of an unsigned int,
** both operands are converted to unsigned long int.
*/
if ((ltype == CF_LONG && rtype == CF_INT && (rhs & CF_UNSIGNED)) ||
(rtype == CF_LONG && ltype == CF_INT && (rhs & CF_UNSIGNED))) {
/* long can represent all unsigneds, so we are in the first sub-case. */
return const_flag | CF_LONG;
}
/* Otherwise, if either operand has type long int, the other operand is converted to long int.
*/
if (ltype == CF_LONG || rtype == CF_LONG) {
return const_flag | CF_LONG;
}
/* Otherwise, if either operand has type unsigned int, the other operand is converted to
** unsigned int.
*/
if ((ltype == CF_INT && (lhs & CF_UNSIGNED)) ||
(rtype == CF_INT && (rhs & CF_UNSIGNED))) {
return const_flag | CF_UNSIGNED | CF_INT;
}
/* Otherwise, both operands have type int. */
CHECK (ltype == CF_INT);
CHECK (!(lhs & CF_UNSIGNED));
CHECK (rtype == CF_INT);
CHECK (!(rhs & CF_UNSIGNED));
return const_flag | CF_INT;
}
unsigned g_typecast (unsigned lhs, unsigned rhs)
/* Cast the value in the primary register to the operand size that is flagged
** by the lhs value. Return the result value.
*/
{
/* Check if a conversion is needed */
if ((rhs & CF_CONST) == 0) {
switch (lhs & CF_TYPEMASK) {
case CF_LONG:
/* We must promote the primary register to long */
g_reglong (rhs);
break;
case CF_INT:
/* We must promote the primary register to int */
g_regint (rhs);
break;
case CF_CHAR:
/* We must truncate the primary register to char */
g_regchar (lhs);
break;
default:
typeerror (lhs);
}
}
/* Do not need any other action. If the left type is int, and the primary
** register is long, it will be automagically truncated. If the right hand
** side is const, it is not located in the primary register and handled by
** the expression parser code.
*/
/* Result is const if the right hand side was const */
lhs |= (rhs & CF_CONST);
/* The resulting type is that of the left hand side (that's why you called
** this function :-)
*/
return lhs;
}
void g_scale (unsigned flags, long val)
/* Scale the value in the primary register by the given value. If val is positive,
** scale up, is val is negative, scale down. This function is used to scale
** the operands or results of pointer arithmetic by the size of the type, the
** pointer points to.
*/
{
/* Value may not be zero */
if (val == 0) {
Internal ("Data type has no size");
} else if (val > 0) {
/* Use a multiplication instead */
if (val != 1) {
g_mul (flags | CF_CONST, val);
}
} else {
/* Scale down */
val = -val;
/* Use a division instead */
if (val != 1) {
g_div (flags | CF_CONST, val);
}
}
}
/*****************************************************************************/
/* Adds and subs of variables fix a fixed address */
/*****************************************************************************/
void g_addlocal (unsigned flags, int offs)
/* Add a local variable to ax */
{
unsigned L;
int NewOff;
/* Correct the offset and check it */
NewOff = offs - StackPtr;
CheckLocalOffs (NewOff);
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
L = GetLocalLabel();
AddCodeLine ("ldy #$%02X", NewOff & 0xFF);
AddCodeLine ("clc");
AddCodeLine ("adc (sp),y");
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
break;
case CF_INT:
AddCodeLine ("ldy #$%02X", NewOff & 0xFF);
AddCodeLine ("clc");
AddCodeLine ("adc (sp),y");
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("iny");
AddCodeLine ("adc (sp),y");
AddCodeLine ("tax");
AddCodeLine ("pla");
break;
case CF_LONG:
/* Do it the old way */
g_push (flags, 0);
g_getlocal (flags, offs);
g_add (flags, 0);
break;
default:
typeerror (flags);
}
}
void g_addstatic (unsigned flags, uintptr_t label, long offs)
/* Add a static variable to ax */
{
unsigned L;
/* Create the correct label name */
const char* lbuf = GetLabelName (flags, label, offs);
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
L = GetLocalLabel();
AddCodeLine ("clc");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
break;
case CF_INT:
AddCodeLine ("clc");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("tay");
AddCodeLine ("txa");
AddCodeLine ("adc %s+1", lbuf);
AddCodeLine ("tax");
AddCodeLine ("tya");
break;
case CF_LONG:
/* Do it the old way */
g_push (flags, 0);
g_getstatic (flags, label, offs);
g_add (flags, 0);
break;
default:
typeerror (flags);
}
}
/*****************************************************************************/
/* Special op= functions */
/*****************************************************************************/
void g_addeqstatic (unsigned flags, uintptr_t label, long offs,
unsigned long val)
/* Emit += for a static variable */
{
/* Create the correct label name */
const char* lbuf = GetLabelName (flags, label, offs);
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("ldx #$00");
if (flags & CF_CONST) {
if (val == 1) {
AddCodeLine ("inc %s", lbuf);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("lda %s", lbuf);
}
} else {
AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
AddCodeLine ("clc");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf);
}
} else {
AddCodeLine ("clc");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf);
}
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
break;
}
/* FALLTHROUGH */
case CF_INT:
if (flags & CF_CONST) {
if (val == 1) {
unsigned L = GetLocalLabel ();
AddCodeLine ("inc %s", lbuf);
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("inc %s+1", lbuf);
g_defcodelabel (L);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("lda %s", lbuf); /* Hmmm... */
AddCodeLine ("ldx %s+1", lbuf);
}
} else {
AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
AddCodeLine ("clc");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf);
if (val < 0x100) {
unsigned L = GetLocalLabel ();
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inc %s+1", lbuf);
g_defcodelabel (L);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("ldx %s+1", lbuf);
}
} else {
AddCodeLine ("lda #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("adc %s+1", lbuf);
AddCodeLine ("sta %s+1", lbuf);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("tax");
AddCodeLine ("lda %s", lbuf);
}
}
}
} else {
AddCodeLine ("clc");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf);
AddCodeLine ("txa");
AddCodeLine ("adc %s+1", lbuf);
AddCodeLine ("sta %s+1", lbuf);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("tax");
AddCodeLine ("lda %s", lbuf);
}
}
break;
case CF_LONG:
if (flags & CF_CONST) {
if (val < 0x100) {
AddCodeLine ("ldy #<(%s)", lbuf);
AddCodeLine ("sty ptr1");
AddCodeLine ("ldy #>(%s)", lbuf);
if (val == 1) {
AddCodeLine ("jsr laddeq1");
} else {
AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
AddCodeLine ("jsr laddeqa");
}
} else {
g_getstatic (flags, label, offs);
g_inc (flags, val);
g_putstatic (flags, label, offs);
}
} else {
AddCodeLine ("ldy #<(%s)", lbuf);
AddCodeLine ("sty ptr1");
AddCodeLine ("ldy #>(%s)", lbuf);
AddCodeLine ("jsr laddeq");
}
break;
default:
typeerror (flags);
}
}
void g_addeqlocal (unsigned flags, int Offs, unsigned long val)
/* Emit += for a local variable */
{
/* Calculate the true offset, check it, load it into Y */
Offs -= StackPtr;
CheckLocalOffs (Offs);
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("ldx #$00");
if (flags & CF_CONST) {
AddCodeLine ("clc");
AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
} else {
AddCodeLine ("clc");
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
}
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
break;
}
/* FALLTHROUGH */
case CF_INT:
AddCodeLine ("ldy #$%02X", Offs);
if (flags & CF_CONST) {
if (IS_Get (&CodeSizeFactor) >= 400) {
AddCodeLine ("clc");
AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
AddCodeLine ("iny");
AddCodeLine ("lda #$%02X", (int) ((val >> 8) & 0xFF));
AddCodeLine ("adc (sp),y");
AddCodeLine ("sta (sp),y");
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("tax");
AddCodeLine ("dey");
AddCodeLine ("lda (sp),y");
}
} else {
g_getimmed (flags, val, 0);
AddCodeLine ("jsr addeqysp");
}
} else {
AddCodeLine ("jsr addeqysp");
}
break;
case CF_LONG:
if (flags & CF_CONST) {
g_getimmed (flags, val, 0);
}
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("jsr laddeqysp");
break;
default:
typeerror (flags);
}
}
void g_addeqind (unsigned flags, unsigned offs, unsigned long val)
/* Emit += for the location with address in ax */
{
/* If the offset is too large for a byte register, add the high byte
** of the offset to the primary. Beware: We need a special correction
** if the offset in the low byte will overflow in the operation.
*/
offs = MakeByteOffs (flags, offs);
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
AddCodeLine ("sta ptr1");
AddCodeLine ("stx ptr1+1");
AddCodeLine ("ldy #$%02X", offs);
AddCodeLine ("ldx #$00");
AddCodeLine ("lda #$%02X", (int)(val & 0xFF));
AddCodeLine ("clc");
AddCodeLine ("adc (ptr1),y");
AddCodeLine ("sta (ptr1),y");
break;
case CF_INT:
case CF_LONG:
AddCodeLine ("jsr pushax"); /* Push the address */
push (CF_PTR); /* Correct the internal sp */
g_getind (flags, offs); /* Fetch the value */
g_inc (flags, val); /* Increment value in primary */
g_putind (flags, offs); /* Store the value back */
break;
default:
typeerror (flags);
}
}
void g_subeqstatic (unsigned flags, uintptr_t label, long offs,
unsigned long val)
/* Emit -= for a static variable */
{
/* Create the correct label name */
const char* lbuf = GetLabelName (flags, label, offs);
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("ldx #$00");
if (flags & CF_CONST) {
if (val == 1) {
AddCodeLine ("dec %s", lbuf);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("lda %s", lbuf);
}
} else {
AddCodeLine ("lda %s", lbuf);
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (int)(val & 0xFF));
AddCodeLine ("sta %s", lbuf);
}
} else {
AddCodeLine ("eor #$FF");
AddCodeLine ("sec");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf);
}
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
break;
}
/* FALLTHROUGH */
case CF_INT:
if (flags & CF_CONST) {
AddCodeLine ("lda %s", lbuf);
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val);
AddCodeLine ("sta %s", lbuf);
if (val < 0x100) {
unsigned L = GetLocalLabel ();
AddCodeLine ("bcs %s", LocalLabelName (L));
AddCodeLine ("dec %s+1", lbuf);
g_defcodelabel (L);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("ldx %s+1", lbuf);
}
} else {
AddCodeLine ("lda %s+1", lbuf);
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("sta %s+1", lbuf);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("tax");
AddCodeLine ("lda %s", lbuf);
}
}
} else {
AddCodeLine ("eor #$FF");
AddCodeLine ("sec");
AddCodeLine ("adc %s", lbuf);
AddCodeLine ("sta %s", lbuf);
AddCodeLine ("txa");
AddCodeLine ("eor #$FF");
AddCodeLine ("adc %s+1", lbuf);
AddCodeLine ("sta %s+1", lbuf);
if ((flags & CF_NOKEEP) == 0) {
AddCodeLine ("tax");
AddCodeLine ("lda %s", lbuf);
}
}
break;
case CF_LONG:
if (flags & CF_CONST) {
if (val < 0x100) {
AddCodeLine ("ldy #<(%s)", lbuf);
AddCodeLine ("sty ptr1");
AddCodeLine ("ldy #>(%s)", lbuf);
AddCodeLine ("lda #$%02X", (unsigned char)val);
AddCodeLine ("jsr lsubeqa");
} else {
g_getstatic (flags, label, offs);
g_dec (flags, val);
g_putstatic (flags, label, offs);
}
} else {
AddCodeLine ("ldy #<(%s)", lbuf);
AddCodeLine ("sty ptr1");
AddCodeLine ("ldy #>(%s)", lbuf);
AddCodeLine ("jsr lsubeq");
}
break;
default:
typeerror (flags);
}
}
void g_subeqlocal (unsigned flags, int Offs, unsigned long val)
/* Emit -= for a local variable */
{
/* Calculate the true offset, check it, load it into Y */
Offs -= StackPtr;
CheckLocalOffs (Offs);
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("ldx #$00");
if (flags & CF_CONST) {
AddCodeLine ("lda (sp),y");
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val);
} else {
AddCodeLine ("eor #$FF");
AddCodeLine ("sec");
AddCodeLine ("adc (sp),y");
}
AddCodeLine ("sta (sp),y");
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
break;
}
/* FALLTHROUGH */
case CF_INT:
if (flags & CF_CONST) {
g_getimmed (flags, val, 0);
}
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("jsr subeqysp");
break;
case CF_LONG:
if (flags & CF_CONST) {
g_getimmed (flags, val, 0);
}
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("jsr lsubeqysp");
break;
default:
typeerror (flags);
}
}
void g_subeqind (unsigned flags, unsigned offs, unsigned long val)
/* Emit -= for the location with address in ax */
{
/* If the offset is too large for a byte register, add the high byte
** of the offset to the primary. Beware: We need a special correction
** if the offset in the low byte will overflow in the operation.
*/
offs = MakeByteOffs (flags, offs);
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
AddCodeLine ("sta ptr1");
AddCodeLine ("stx ptr1+1");
AddCodeLine ("ldy #$%02X", offs);
AddCodeLine ("ldx #$00");
AddCodeLine ("lda (ptr1),y");
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val);
AddCodeLine ("sta (ptr1),y");
break;
case CF_INT:
case CF_LONG:
AddCodeLine ("jsr pushax"); /* Push the address */
push (CF_PTR); /* Correct the internal sp */
g_getind (flags, offs); /* Fetch the value */
g_dec (flags, val); /* Increment value in primary */
g_putind (flags, offs); /* Store the value back */
break;
default:
typeerror (flags);
}
}
/*****************************************************************************/
/* Add a variable address to the value in ax */
/*****************************************************************************/
void g_addaddr_local (unsigned flags attribute ((unused)), int offs)
/* Add the address of a local variable to ax */
{
unsigned L = 0;
/* Add the offset */
offs -= StackPtr;
if (IS_Get (&CodeSizeFactor) <= 100) {
if (offs != 0) {
/* We cannot address more then 256 bytes of locals anyway */
g_inc (CF_INT | CF_CONST, offs);
}
/* Add the current stackpointer value */
AddCodeLine ("jsr leaaxsp");
} else {
if (offs != 0) {
/* We cannot address more then 256 bytes of locals anyway */
L = GetLocalLabel();
CheckLocalOffs (offs);
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", offs & 0xFF);
/* Do also skip the CLC insn below */
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
}
/* Add the current stackpointer value */
AddCodeLine ("clc");
if (L != 0) {
/* Label was used above */
g_defcodelabel (L);
}
AddCodeLine ("adc sp");
AddCodeLine ("tay");
AddCodeLine ("txa");
AddCodeLine ("adc sp+1");
AddCodeLine ("tax");
AddCodeLine ("tya");
}
}
void g_addaddr_static (unsigned flags, uintptr_t label, long offs)
/* Add the address of a static variable to ax */
{
/* Create the correct label name */
const char* lbuf = GetLabelName (flags, label, offs);
/* Add the address to the current ax value */
AddCodeLine ("clc");
AddCodeLine ("adc #<(%s)", lbuf);
AddCodeLine ("tay");
AddCodeLine ("txa");
AddCodeLine ("adc #>(%s)", lbuf);
AddCodeLine ("tax");
AddCodeLine ("tya");
}
/*****************************************************************************/
/* */
/*****************************************************************************/
void g_save (unsigned flags)
/* Copy primary register to hold register. */
{
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("pha");
break;
}
/* FALLTHROUGH */
case CF_INT:
AddCodeLine ("sta regsave");
AddCodeLine ("stx regsave+1");
break;
case CF_LONG:
AddCodeLine ("jsr saveeax");
break;
default:
typeerror (flags);
}
}
void g_restore (unsigned flags)
/* Copy hold register to primary. */
{
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("pla");
break;
}
/* FALLTHROUGH */
case CF_INT:
AddCodeLine ("lda regsave");
AddCodeLine ("ldx regsave+1");
break;
case CF_LONG:
AddCodeLine ("jsr resteax");
break;
default:
typeerror (flags);
}
}
void g_cmp (unsigned flags, unsigned long val)
/* Immediate compare. The primary register will not be changed, Z flag
** will be set.
*/
{
unsigned L;
/* Check the size and determine operation */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
break;
}
/* FALLTHROUGH */
case CF_INT:
L = GetLocalLabel();
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
g_defcodelabel (L);
break;
case CF_LONG:
Internal ("g_cmp: Long compares not implemented");
break;
default:
typeerror (flags);
}
}
static void oper (unsigned Flags, unsigned long Val, const char* const* Subs)
/* Encode a binary operation. subs is a pointer to four strings:
** 0 --> Operate on ints
** 1 --> Operate on unsigneds
** 2 --> Operate on longs
** 3 --> Operate on unsigned longs
*/
{
/* Determine the offset into the array */
if (Flags & CF_UNSIGNED) {
++Subs;
}
if ((Flags & CF_TYPEMASK) == CF_LONG) {
Subs += 2;
}
/* Load the value if it is not already in the primary */
if (Flags & CF_CONST) {
/* Load value */
g_getimmed (Flags, Val, 0);
}
/* Output the operation */
AddCodeLine ("jsr %s", *Subs);
/* The operation will pop it's argument */
pop (Flags);
}
void g_test (unsigned flags)
/* Test the value in the primary and set the condition codes */
{
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("tax");
break;
}
/* FALLTHROUGH */
case CF_INT:
AddCodeLine ("stx tmp1");
AddCodeLine ("ora tmp1");
break;
case CF_LONG:
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr utsteax");
} else {
AddCodeLine ("jsr tsteax");
}
break;
default:
typeerror (flags);
}
}
void g_push (unsigned flags, unsigned long val)
/* Push the primary register or a constant value onto the stack */
{
if (flags & CF_CONST && (flags & CF_TYPEMASK) != CF_LONG) {
/* We have a constant 8 or 16 bit value */
if ((flags & CF_TYPEMASK) == CF_CHAR && (flags & CF_FORCECHAR)) {
/* Handle as 8 bit value */
AddCodeLine ("lda #$%02X", (unsigned char) val);
AddCodeLine ("jsr pusha");
} else {
/* Handle as 16 bit value */
g_getimmed (flags, val, 0);
AddCodeLine ("jsr pushax");
}
} else {
/* Value is not 16 bit or not constant */
if (flags & CF_CONST) {
/* Constant 32 bit value, load into eax */
g_getimmed (flags, val, 0);
}
/* Push the primary register */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
/* Handle as char */
AddCodeLine ("jsr pusha");
break;
}
/* FALL THROUGH */
case CF_INT:
AddCodeLine ("jsr pushax");
break;
case CF_LONG:
AddCodeLine ("jsr pusheax");
break;
default:
typeerror (flags);
}
}
/* Adjust the stack offset */
push (flags);
}
void g_swap (unsigned flags)
/* Swap the primary register and the top of the stack. flags give the type
** of *both* values (must have same size).
*/
{
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
case CF_INT:
AddCodeLine ("jsr swapstk");
break;
case CF_LONG:
AddCodeLine ("jsr swapestk");
break;
default:
typeerror (flags);
}
}
void g_call (unsigned Flags, const char* Label, unsigned ArgSize)
/* Call the specified subroutine name */
{
if ((Flags & CF_FIXARGC) == 0) {
/* Pass the argument count */
AddCodeLine ("ldy #$%02X", ArgSize);
}
AddCodeLine ("jsr _%s", Label);
StackPtr += ArgSize; /* callee pops args */
}
void g_callind (unsigned Flags, unsigned ArgSize, int Offs)
/* Call subroutine indirect */
{
if ((Flags & CF_ADDRMASK) != CF_STACK) {
/* Address is in a/x */
if ((Flags & CF_FIXARGC) == 0) {
/* Pass arg count */
AddCodeLine ("ldy #$%02X", ArgSize);
}
AddCodeLine ("jsr callax");
} else {
/* The address is on stack, offset is on Val */
Offs -= StackPtr;
CheckLocalOffs (Offs);
AddCodeLine ("pha");
AddCodeLine ("ldy #$%02X", Offs);
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta jmpvec+1");
AddCodeLine ("iny");
AddCodeLine ("lda (sp),y");
AddCodeLine ("sta jmpvec+2");
AddCodeLine ("pla");
AddCodeLine ("jsr jmpvec");
}
/* Callee pops args */
StackPtr += ArgSize;
}
void g_jump (unsigned Label)
/* Jump to specified internal label number */
{
AddCodeLine ("jmp %s", LocalLabelName (Label));
}
void g_truejump (unsigned flags attribute ((unused)), unsigned label)
/* Jump to label if zero flag clear */
{
AddCodeLine ("jne %s", LocalLabelName (label));
}
void g_falsejump (unsigned flags attribute ((unused)), unsigned label)
/* Jump to label if zero flag set */
{
AddCodeLine ("jeq %s", LocalLabelName (label));
}
void g_branch (unsigned Label)
/* Branch unconditionally to Label if the CPU has the BRA instruction.
** Otherwise, jump to Label.
** Use this function, instead of g_jump(), only where it is certain that
** the label cannot be farther away from the branch than -128/+127 bytes.
*/
{
if ((CPUIsets[CPU] & (CPU_ISET_65SC02 | CPU_ISET_6502DTV)) != 0) {
AddCodeLine ("bra %s", LocalLabelName (Label));
} else {
g_jump (Label);
}
}
void g_lateadjustSP (unsigned label)
/* Adjust stack based on non-immediate data */
{
AddCodeLine ("pha");
AddCodeLine ("lda %s", LocalDataLabelName (label));
AddCodeLine ("clc");
AddCodeLine ("adc sp");
AddCodeLine ("sta sp");
AddCodeLine ("lda %s+1", LocalDataLabelName (label));
AddCodeLine ("adc sp+1");
AddCodeLine ("sta sp+1");
AddCodeLine ("pla");
}
void g_drop (unsigned Space)
/* Drop space allocated on the stack */
{
if (Space > 255) {
/* Inline the code since calling addysp repeatedly is quite some
** overhead.
*/
AddCodeLine ("pha");
AddCodeLine ("lda #$%02X", (unsigned char) Space);
AddCodeLine ("clc");
AddCodeLine ("adc sp");
AddCodeLine ("sta sp");
AddCodeLine ("lda #$%02X", (unsigned char) (Space >> 8));
AddCodeLine ("adc sp+1");
AddCodeLine ("sta sp+1");
AddCodeLine ("pla");
} else if (Space > 8) {
AddCodeLine ("ldy #$%02X", Space);
AddCodeLine ("jsr addysp");
} else if (Space != 0) {
AddCodeLine ("jsr incsp%u", Space);
}
}
void g_space (int Space)
/* Create or drop space on the stack */
{
if (Space < 0) {
/* This is actually a drop operation */
g_drop (-Space);
} else if (Space > 255) {
/* Inline the code since calling subysp repeatedly is quite some
** overhead.
*/
AddCodeLine ("pha");
AddCodeLine ("lda sp");
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char) Space);
AddCodeLine ("sta sp");
AddCodeLine ("lda sp+1");
AddCodeLine ("sbc #$%02X", (unsigned char) (Space >> 8));
AddCodeLine ("sta sp+1");
AddCodeLine ("pla");
} else if (Space > 8) {
AddCodeLine ("ldy #$%02X", Space);
AddCodeLine ("jsr subysp");
} else if (Space != 0) {
AddCodeLine ("jsr decsp%u", Space);
}
}
void g_cstackcheck (void)
/* Check for a C stack overflow */
{
AddCodeLine ("jsr cstkchk");
}
void g_stackcheck (void)
/* Check for a stack overflow */
{
AddCodeLine ("jsr stkchk");
}
void g_add (unsigned flags, unsigned long val)
/* Primary = TOS + Primary */
{
static const char* const ops[4] = {
"tosaddax", "tosaddax", "tosaddeax", "tosaddeax"
};
if (flags & CF_CONST) {
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
g_push (flags & ~CF_CONST, 0);
}
oper (flags, val, ops);
}
void g_sub (unsigned flags, unsigned long val)
/* Primary = TOS - Primary */
{
static const char* const ops[4] = {
"tossubax", "tossubax", "tossubeax", "tossubeax"
};
if (flags & CF_CONST) {
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
g_push (flags & ~CF_CONST, 0);
}
oper (flags, val, ops);
}
void g_rsub (unsigned flags, unsigned long val)
/* Primary = Primary - TOS */
{
static const char* const ops[4] = {
"tosrsubax", "tosrsubax", "tosrsubeax", "tosrsubeax"
};
oper (flags, val, ops);
}
void g_mul (unsigned flags, unsigned long val)
/* Primary = TOS * Primary */
{
static const char* const ops[4] = {
"tosmulax", "tosumulax", "tosmuleax", "tosumuleax"
};
/* Do strength reduction if the value is constant and a power of two */
if (flags & CF_CONST) {
/* Deal with negative values if it's signed multiplication */
int Negation = (flags & CF_UNSIGNED) == 0 && (long)val < 0;
int p2 = PowerOf2 (Negation ? 0UL - val : val);
/* Check if we can use shift instead of multiplication */
if (p2 == 0 || (p2 > 0 && IS_Get (&CodeSizeFactor) >= (Negation ? 100 : 0))) {
/* Generate a shift instead */
g_asl (flags, p2);
/* Negate the result if val is negative */
if (Negation) {
g_neg (flags);
}
/* Done */
return;
}
}
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
/* Handle some special cases */
switch (val) {
case 3:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
return;
case 5:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
return;
case 6:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
AddCodeLine ("asl a");
return;
case 10:
AddCodeLine ("sta tmp1");
AddCodeLine ("asl a");
AddCodeLine ("asl a");
AddCodeLine ("clc");
AddCodeLine ("adc tmp1");
AddCodeLine ("asl a");
return;
}
}
/* FALLTHROUGH */
case CF_INT:
switch (val) {
case 3:
AddCodeLine ("jsr mulax3");
return;
case 5:
AddCodeLine ("jsr mulax5");
return;
case 6:
AddCodeLine ("jsr mulax6");
return;
case 7:
AddCodeLine ("jsr mulax7");
return;
case 9:
AddCodeLine ("jsr mulax9");
return;
case 10:
AddCodeLine ("jsr mulax10");
return;
}
break;
case CF_LONG:
break;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff.
*/
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_div (unsigned flags, unsigned long val)
/* Primary = TOS / Primary */
{
static const char* const ops[4] = {
"tosdivax", "tosudivax", "tosdiveax", "tosudiveax"
};
/* Do strength reduction if the value is constant and a power of two */
if (flags & CF_CONST) {
/* Deal with negative values as well as different sizes */
int Negation = (flags & CF_UNSIGNED) == 0 && (long)val < 0;
unsigned long NegatedVal = 0UL - val;
int p2 = PowerOf2 (Negation ? NegatedVal : val);
/* Generate a shift instead */
if ((flags & CF_UNSIGNED) != 0 && p2 > 0) {
g_asr (flags, p2);
return;
}
/* Check if we can afford using shift instead of multiplication at the
** cost of code size */
if (p2 == 0 || (p2 > 0 && IS_Get (&CodeSizeFactor) >= (Negation ? 200 : 170))) {
/* Generate a conditional shift instead */
if (p2 > 0) {
unsigned int DoShiftLabel = GetLocalLabel ();
unsigned int EndLabel = GetLocalLabel ();
unsigned long MaskedVal = Negation ? val : NegatedVal;
/* GitHub #169 - if abs(expr) < abs(val), the result is always 0.
** First, check whether expr >= 0 and skip to the shift if true.
*/
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
MaskedVal &= 0xFF;
AddCodeLine ("cmp #$00");
AddCodeLine ("bpl %s", LocalLabelName (DoShiftLabel));
break;
}
/* FALLTHROUGH */
case CF_INT:
MaskedVal &= 0xFFFF;
AddCodeLine ("cpx #$00");
AddCodeLine ("bpl %s", LocalLabelName (DoShiftLabel));
break;
case CF_LONG:
MaskedVal &= 0xFFFFFFFF;
AddCodeLine ("ldy sreg+1");
AddCodeLine ("bpl %s", LocalLabelName (DoShiftLabel));
break;
default:
typeerror (flags);
break;
}
/* Second, check whether expr <= -asb(val) and skip to the
** shift if true. The original content of expr has to be saved
** before the checking comparison and restored after that, as
** the content in Primary register will be destroyed.
** The result of the comparison is a boolean. We can store
** it in the Carry flag with a LSR and branch on it later.
*/
g_save (flags);
g_le (flags | CF_UNSIGNED, MaskedVal);
AddCodeLine ("lsr a");
g_restore (flags);
AddCodeLine ("bcs %s", LocalLabelName (DoShiftLabel));
/* The result is 0. We can just load 0 and skip the shifting. */
g_getimmed (flags | CF_ABSOLUTE, 0, 0);
/* TODO: replace with BEQ? Would it be optimized? */
g_jump (EndLabel);
/* Do the shift. The sign of the result may need to be corrected
** later.
*/
g_defcodelabel (DoShiftLabel);
g_asr (flags, p2);
g_defcodelabel (EndLabel);
}
/* Negate the result as long as val < 0, even if val == -1 and no
** shift was generated.
*/
if (Negation) {
g_neg (flags);
}
/* Done */
return;
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff.
*/
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
g_push (flags & ~CF_CONST, 0);
}
/* Generate a division */
oper (flags, val, ops);
}
void g_mod (unsigned flags, unsigned long val)
/* Primary = TOS % Primary */
{
static const char* const ops[4] = {
"tosmodax", "tosumodax", "tosmodeax", "tosumodeax"
};
int p2;
/* Check if we can do some cost reduction */
if ((flags & CF_CONST) && (flags & CF_UNSIGNED) && val != 0xFFFFFFFF && (p2 = PowerOf2 (val)) >= 0) {
/* We can do that with an AND operation */
g_and (flags, val - 1);
} else {
/* Do it the hard way... */
if (flags & CF_CONST) {
/* lhs is not on stack */
flags &= ~CF_FORCECHAR; /* Handle chars as ints */
g_push (flags & ~CF_CONST, 0);
}
oper (flags, val, ops);
}
}
void g_or (unsigned flags, unsigned long val)
/* Primary = TOS | Primary */
{
static const char* const ops[4] = {
"tosorax", "tosorax", "tosoreax", "tosoreax"
};
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if ((val & 0xFF) != 0) {
AddCodeLine ("ora #$%02X", (unsigned char)val);
}
return;
}
/* FALLTHROUGH */
case CF_INT:
if (val <= 0xFF) {
if ((val & 0xFF) != 0) {
AddCodeLine ("ora #$%02X", (unsigned char)val);
}
} else if ((val & 0xFF00) == 0xFF00) {
if ((val & 0xFF) != 0) {
AddCodeLine ("ora #$%02X", (unsigned char)val);
}
AddCodeLine ("ldx #$FF");
} else if (val != 0) {
AddCodeLine ("ora #$%02X", (unsigned char)val);
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("ora #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
}
return;
case CF_LONG:
if (val <= 0xFF) {
if ((val & 0xFF) != 0) {
AddCodeLine ("ora #$%02X", (unsigned char)val);
}
return;
}
break;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_xor (unsigned flags, unsigned long val)
/* Primary = TOS ^ Primary */
{
static const char* const ops[4] = {
"tosxorax", "tosxorax", "tosxoreax", "tosxoreax"
};
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if ((val & 0xFF) != 0) {
AddCodeLine ("eor #$%02X", (unsigned char)val);
}
return;
}
/* FALLTHROUGH */
case CF_INT:
if (val <= 0xFF) {
if (val != 0) {
AddCodeLine ("eor #$%02X", (unsigned char)val);
}
} else if (val != 0) {
if ((val & 0xFF) != 0) {
AddCodeLine ("eor #$%02X", (unsigned char)val);
}
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("eor #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
}
return;
case CF_LONG:
if (val <= 0xFF) {
if (val != 0) {
AddCodeLine ("eor #$%02X", (unsigned char)val);
}
return;
}
break;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_and (unsigned Flags, unsigned long Val)
/* Primary = TOS & Primary */
{
static const char* const ops[4] = {
"tosandax", "tosandax", "tosandeax", "tosandeax"
};
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (Flags & CF_CONST) {
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if (Flags & CF_FORCECHAR) {
if ((Val & 0xFF) == 0x00) {
AddCodeLine ("lda #$00");
} else if ((Val & 0xFF) != 0xFF) {
AddCodeLine ("and #$%02X", (unsigned char)Val);
}
return;
}
/* FALLTHROUGH */
case CF_INT:
if ((Val & 0xFFFF) != 0xFFFF) {
if (Val <= 0xFF) {
AddCodeLine ("ldx #$00");
if (Val == 0) {
AddCodeLine ("lda #$00");
} else if (Val != 0xFF) {
AddCodeLine ("and #$%02X", (unsigned char)Val);
}
} else if ((Val & 0xFFFF) == 0xFF00) {
AddCodeLine ("lda #$00");
} else if ((Val & 0xFF00) == 0xFF00) {
AddCodeLine ("and #$%02X", (unsigned char)Val);
} else if ((Val & 0x00FF) == 0x0000) {
AddCodeLine ("txa");
AddCodeLine ("and #$%02X", (unsigned char)(Val >> 8));
AddCodeLine ("tax");
AddCodeLine ("lda #$00");
} else {
AddCodeLine ("tay");
AddCodeLine ("txa");
AddCodeLine ("and #$%02X", (unsigned char)(Val >> 8));
AddCodeLine ("tax");
AddCodeLine ("tya");
if ((Val & 0x00FF) == 0x0000) {
AddCodeLine ("lda #$00");
} else if ((Val & 0x00FF) != 0x00FF) {
AddCodeLine ("and #$%02X", (unsigned char)Val);
}
}
}
return;
case CF_LONG:
if (Val <= 0xFF) {
AddCodeLine ("ldx #$00");
AddCodeLine ("stx sreg+1");
AddCodeLine ("stx sreg");
if ((Val & 0xFF) != 0xFF) {
AddCodeLine ("and #$%02X", (unsigned char)Val);
}
return;
} else if (Val == 0xFF00) {
AddCodeLine ("lda #$00");
AddCodeLine ("sta sreg+1");
AddCodeLine ("sta sreg");
return;
}
break;
default:
typeerror (Flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
Flags &= ~CF_FORCECHAR;
g_push (Flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (Flags, Val, ops);
}
void g_asr (unsigned flags, unsigned long val)
/* Primary = TOS >> Primary */
{
static const char* const ops[4] = {
"tosasrax", "tosshrax", "tosasreax", "tosshreax"
};
/* If the right hand side is const, the lhs is not on stack, but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
val &= 7;
if ((flags & CF_UNSIGNED) != 0) {
/* Instead of `val` right shifts, we can also do `9 - val` left rotates
** and a mask. This saves 3 bytes and 8 cycles for `val == 7` and
** 1 byte and 4 cycles for `val == 6`.
*/
if (val < 6) {
while (val--) {
AddCodeLine ("lsr a"); /* 1 byte, 2 cycles */
}
} else {
unsigned i;
/* The first ROL shifts in garbage and sets carry to the high bit.
** The garbage is cleaned up by the mask.
*/
for (i = val; i < 9; ++i) {
AddCodeLine ("rol a"); /* 1 byte, 2 cycles */
}
/* 2 bytes, 2 cycles */
AddCodeLine ("and #$%02X", 0xFF >> val);
}
return;
} else if (val <= 2) {
while (val--) {
AddCodeLine ("cmp #$80");
AddCodeLine ("ror a");
}
return;
}
AddCodeLine ("ldx #$00");
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel ();
AddCodeLine ("cmp #$80"); /* Sign bit into carry */
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("dex"); /* Make $FF */
g_defcodelabel (L);
}
}
/* FALLTHROUGH */
case CF_INT:
val &= 0x0F;
if (val >= 8) {
AddCodeLine ("txa");
if (flags & CF_UNSIGNED) {
AddCodeLine ("ldx #$00");
} else {
unsigned L = GetLocalLabel ();
AddCodeLine ("cpx #$80"); /* Sign bit into carry */
AddCodeLine ("ldx #$00");
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("dex"); /* Make $FF */
g_defcodelabel (L);
}
val -= 8;
}
if (val >= 4) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shrax4");
} else {
AddCodeLine ("jsr asrax4");
}
val -= 4;
}
if (val > 0) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shrax%lu", val);
} else {
AddCodeLine ("jsr asrax%lu", val);
}
}
return;
case CF_LONG:
val &= 0x1F;
if (val >= 24) {
AddCodeLine ("ldx #$00");
AddCodeLine ("lda sreg+1");
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel ();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
AddCodeLine ("stx sreg");
AddCodeLine ("stx sreg+1");
val -= 24;
}
if (val >= 16) {
AddCodeLine ("ldy #$00");
AddCodeLine ("ldx sreg+1");
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel ();
AddCodeLine ("bpl %s", LocalLabelName (L));
AddCodeLine ("dey");
g_defcodelabel (L);
}
AddCodeLine ("lda sreg");
AddCodeLine ("sty sreg+1");
AddCodeLine ("sty sreg");
val -= 16;
}
if (val >= 8) {
AddCodeLine ("txa");
AddCodeLine ("ldx sreg");
AddCodeLine ("ldy sreg+1");
AddCodeLine ("sty sreg");
if ((flags & CF_UNSIGNED) == 0) {
unsigned L = GetLocalLabel ();
AddCodeLine ("cpy #$80");
AddCodeLine ("ldy #$00");
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("dey");
g_defcodelabel (L);
} else {
AddCodeLine ("ldy #$00");
}
AddCodeLine ("sty sreg+1");
val -= 8;
}
if (val >= 4) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shreax4");
} else {
AddCodeLine ("jsr asreax4");
}
val -= 4;
}
if (val > 0) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shreax%lu", val);
} else {
AddCodeLine ("jsr asreax%lu", val);
}
}
return;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_asl (unsigned flags, unsigned long val)
/* Primary = TOS << Primary */
{
static const char* const ops[4] = {
"tosaslax", "tosshlax", "tosasleax", "tosshleax"
};
/* If the right hand side is const, the lhs is not on stack, but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if ((flags & CF_FORCECHAR) != 0) {
val &= 7;
/* Large shifts are faster and smaller with ROR. See g_asr for detailed
** byte and cycle counts.
*/
if (val < 6) {
while (val--) {
AddCodeLine ("asl a");
}
} else {
unsigned i;
for (i = val; i < 9; ++i) {
AddCodeLine ("ror a");
}
AddCodeLine ("and #$%02X", (~0U << val) & 0xFF);
}
return;
}
/* FALLTHROUGH */
case CF_INT:
val &= 0x0F;
if (val >= 8) {
AddCodeLine ("tax");
AddCodeLine ("lda #$00");
val -= 8;
}
if (val >= 4) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shlax4");
} else {
AddCodeLine ("jsr aslax4");
}
val -= 4;
}
if (val > 0) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shlax%lu", val);
} else {
AddCodeLine ("jsr aslax%lu", val);
}
}
return;
case CF_LONG:
val &= 0x1F;
if (val >= 24) {
AddCodeLine ("sta sreg+1");
AddCodeLine ("lda #$00");
AddCodeLine ("tax");
AddCodeLine ("sta sreg");
val -= 24;
}
if (val >= 16) {
AddCodeLine ("stx sreg+1");
AddCodeLine ("sta sreg");
AddCodeLine ("lda #$00");
AddCodeLine ("tax");
val -= 16;
}
if (val >= 8) {
AddCodeLine ("ldy sreg");
AddCodeLine ("sty sreg+1");
AddCodeLine ("stx sreg");
AddCodeLine ("tax");
AddCodeLine ("lda #$00");
val -= 8;
}
if (val > 4) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shleax4");
} else {
AddCodeLine ("jsr asleax4");
}
val -= 4;
}
if (val > 0) {
if (flags & CF_UNSIGNED) {
AddCodeLine ("jsr shleax%lu", val);
} else {
AddCodeLine ("jsr asleax%lu", val);
}
}
return;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_neg (unsigned Flags)
/* Primary = -Primary */
{
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if (Flags & CF_FORCECHAR) {
AddCodeLine ("eor #$FF");
AddCodeLine ("clc");
AddCodeLine ("adc #$01");
return;
}
/* FALLTHROUGH */
case CF_INT:
AddCodeLine ("jsr negax");
break;
case CF_LONG:
AddCodeLine ("jsr negeax");
break;
default:
typeerror (Flags);
}
}
void g_bneg (unsigned flags)
/* Primary = !Primary */
{
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
AddCodeLine ("jsr bnega");
break;
case CF_INT:
AddCodeLine ("jsr bnegax");
break;
case CF_LONG:
AddCodeLine ("jsr bnegeax");
break;
default:
typeerror (flags);
}
}
void g_com (unsigned Flags)
/* Primary = ~Primary */
{
switch (Flags & CF_TYPEMASK) {
case CF_CHAR:
if (Flags & CF_FORCECHAR) {
AddCodeLine ("eor #$FF");
return;
}
/* FALLTHROUGH */
case CF_INT:
AddCodeLine ("jsr complax");
break;
case CF_LONG:
AddCodeLine ("jsr compleax");
break;
default:
typeerror (Flags);
}
}
void g_inc (unsigned flags, unsigned long val)
/* Increment the primary register by a given number */
{
/* Don't inc by zero */
if (val == 0) {
return;
}
/* Generate code for the supported types */
flags &= ~CF_CONST;
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if ((CPUIsets[CPU] & CPU_ISET_65SC02) != 0 && val <= 2) {
while (val--) {
AddCodeLine ("ina");
}
} else {
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", (unsigned char)val);
}
break;
}
/* FALLTHROUGH */
case CF_INT:
if ((CPUIsets[CPU] & CPU_ISET_65SC02) != 0 && val == 1) {
unsigned L = GetLocalLabel();
AddCodeLine ("ina");
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
} else if (IS_Get (&CodeSizeFactor) < 200) {
/* Use jsr calls */
if (val <= 8) {
AddCodeLine ("jsr incax%lu", val);
} else if (val <= 255) {
AddCodeLine ("ldy #$%02X", (unsigned char) val);
AddCodeLine ("jsr incaxy");
} else {
g_add (flags | CF_CONST, val);
}
} else {
/* Inline the code */
if (val <= 0x300) {
if ((val & 0xFF) != 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", (unsigned char) val);
AddCodeLine ("bcc %s", LocalLabelName (L));
AddCodeLine ("inx");
g_defcodelabel (L);
}
if (val >= 0x100) {
AddCodeLine ("inx");
}
if (val >= 0x200) {
AddCodeLine ("inx");
}
if (val >= 0x300) {
AddCodeLine ("inx");
}
} else if ((val & 0xFF) != 0) {
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", (unsigned char) val);
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
} else {
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("clc");
AddCodeLine ("adc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
}
}
break;
case CF_LONG:
if (val <= 255) {
AddCodeLine ("ldy #$%02X", (unsigned char) val);
AddCodeLine ("jsr inceaxy");
} else {
g_add (flags | CF_CONST, val);
}
break;
default:
typeerror (flags);
}
}
void g_dec (unsigned flags, unsigned long val)
/* Decrement the primary register by a given number */
{
/* Don't dec by zero */
if (val == 0) {
return;
}
/* Generate code for the supported types */
flags &= ~CF_CONST;
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if ((CPUIsets[CPU] & CPU_ISET_65SC02) != 0 && val <= 2) {
while (val--) {
AddCodeLine ("dea");
}
} else {
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val);
}
break;
}
/* FALLTHROUGH */
case CF_INT:
if (IS_Get (&CodeSizeFactor) < 200) {
/* Use subroutines */
if (val <= 8) {
AddCodeLine ("jsr decax%d", (int) val);
} else if (val <= 255) {
AddCodeLine ("ldy #$%02X", (unsigned char) val);
AddCodeLine ("jsr decaxy");
} else {
g_sub (flags | CF_CONST, val);
}
} else {
/* Inline the code */
if (val < 0x300) {
if ((val & 0xFF) != 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char) val);
AddCodeLine ("bcs %s", LocalLabelName (L));
AddCodeLine ("dex");
g_defcodelabel (L);
}
if (val >= 0x100) {
AddCodeLine ("dex");
}
if (val >= 0x200) {
AddCodeLine ("dex");
}
} else {
if ((val & 0xFF) != 0) {
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char) val);
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
} else {
AddCodeLine ("pha");
AddCodeLine ("txa");
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char) (val >> 8));
AddCodeLine ("tax");
AddCodeLine ("pla");
}
}
}
break;
case CF_LONG:
if (val <= 255) {
AddCodeLine ("ldy #$%02X", (unsigned char) val);
AddCodeLine ("jsr deceaxy");
} else {
g_sub (flags | CF_CONST, val);
}
break;
default:
typeerror (flags);
}
}
/*
** Following are the conditional operators. They compare the TOS against
** the primary and put a literal 1 in the primary if the condition is
** true, otherwise they clear the primary register
*/
void g_eq (unsigned flags, unsigned long val)
/* Test for equal */
{
static const char* const ops[4] = {
"toseqax", "toseqax", "toseqeax", "toseqeax"
};
unsigned L;
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr booleq");
return;
}
/* FALLTHROUGH */
case CF_INT:
L = GetLocalLabel();
AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("cmp #$%02X", (unsigned char)val);
g_defcodelabel (L);
AddCodeLine ("jsr booleq");
return;
case CF_LONG:
break;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_ne (unsigned flags, unsigned long val)
/* Test for not equal */
{
static const char* const ops[4] = {
"tosneax", "tosneax", "tosneeax", "tosneeax"
};
unsigned L;
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolne");
return;
}
/* FALLTHROUGH */
case CF_INT:
L = GetLocalLabel();
AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("cmp #$%02X", (unsigned char)val);
g_defcodelabel (L);
AddCodeLine ("jsr boolne");
return;
case CF_LONG:
break;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_lt (unsigned flags, unsigned long val)
/* Test for less than */
{
static const char* const ops[4] = {
"tosltax", "tosultax", "toslteax", "tosulteax"
};
unsigned Label;
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
/* Because the handling of the overflow flag is too complex for
** inlining, we can handle only unsigned compares, and signed
** compares against zero here.
*/
if (flags & CF_UNSIGNED) {
/* Give a warning in some special cases */
if (val == 0) {
Warning ("Comparison of unsigned type < 0 is always false");
AddCodeLine ("jsr return0");
return;
}
/* Look at the type */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("jsr boolult");
return;
}
/* FALLTHROUGH */
case CF_INT:
/* If the low byte is zero, we must only test the high byte */
AddCodeLine ("cpx #$%02X", (unsigned char)(val >> 8));
if ((val & 0xFF) != 0) {
unsigned L = GetLocalLabel();
AddCodeLine ("bne %s", LocalLabelName (L));
AddCodeLine ("cmp #$%02X", (unsigned char)val);
g_defcodelabel (L);
}
AddCodeLine ("jsr boolult");
return;
case CF_LONG:
/* Do a subtraction */
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("lda sreg");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 16));
AddCodeLine ("lda sreg+1");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 24));
AddCodeLine ("jsr boolult");
return;
default:
typeerror (flags);
}
} else if (val == 0) {
/* A signed compare against zero must only look at the sign bit */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("asl a"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
}
/* FALLTHROUGH */
case CF_INT:
/* Just check the high byte */
AddCodeLine ("cpx #$80"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
case CF_LONG:
/* Just check the high byte */
AddCodeLine ("lda sreg+1");
AddCodeLine ("asl a"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
default:
typeerror (flags);
}
} else {
/* Signed compare against a constant != zero */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
Label = GetLocalLabel ();
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val);
AddCodeLine ("bvc %s", LocalLabelName (Label));
AddCodeLine ("eor #$80");
g_defcodelabel (Label);
AddCodeLine ("asl a"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
}
/* FALLTHROUGH */
case CF_INT:
/* Do a subtraction */
Label = GetLocalLabel ();
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("bvc %s", LocalLabelName (Label));
AddCodeLine ("eor #$80");
g_defcodelabel (Label);
AddCodeLine ("asl a"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
case CF_LONG:
/* This one is too costly */
break;
default:
typeerror (flags);
}
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_le (unsigned flags, unsigned long val)
/* Test for less than or equal to */
{
static const char* const ops[4] = {
"tosleax", "tosuleax", "tosleeax", "tosuleeax"
};
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
/* Look at the type */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if (flags & CF_UNSIGNED) {
/* Unsigned compare */
if (val < 0xFF) {
/* Use < instead of <= because the former gives
** better code on the 6502 than the latter.
*/
g_lt (flags, val+1);
} else {
/* Always true */
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
}
} else {
/* Signed compare */
if ((long) val < 0x7F) {
/* Use < instead of <= because the former gives
** better code on the 6502 than the latter.
*/
g_lt (flags, val+1);
} else {
/* Always true */
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
}
}
return;
}
/* FALLTHROUGH */
case CF_INT:
if (flags & CF_UNSIGNED) {
/* Unsigned compare */
if (val < 0xFFFF) {
/* Use < instead of <= because the former gives
** better code on the 6502 than the latter.
*/
g_lt (flags, val+1);
} else {
/* Always true */
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
}
} else {
/* Signed compare */
if ((long) val < 0x7FFF) {
g_lt (flags, val+1);
} else {
/* Always true */
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
}
}
return;
case CF_LONG:
if (flags & CF_UNSIGNED) {
/* Unsigned compare */
if (val < 0xFFFFFFFF) {
/* Use < instead of <= because the former gives
** better code on the 6502 than the latter.
*/
g_lt (flags, val+1);
} else {
/* Always true */
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
}
} else {
/* Signed compare */
if ((long) val < 0x7FFFFFFF) {
g_lt (flags, val+1);
} else {
/* Always true */
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
}
}
return;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_gt (unsigned flags, unsigned long val)
/* Test for greater than */
{
static const char* const ops[4] = {
"tosgtax", "tosugtax", "tosgteax", "tosugteax"
};
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
/* Look at the type */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
if (flags & CF_UNSIGNED) {
if (val == 0) {
/* If we have a compare > 0, we will replace it by
** != 0 here, since both are identical but the
** latter is easier to optimize.
*/
g_ne (flags, val);
} else if (val < 0xFF) {
/* Use >= instead of > because the former gives
** better code on the 6502 than the latter.
*/
g_ge (flags, val+1);
} else {
/* Never true */
Warning ("Condition is never true");
AddCodeLine ("jsr return0");
}
} else {
if ((long) val < 0x7F) {
/* Use >= instead of > because the former gives
** better code on the 6502 than the latter.
*/
g_ge (flags, val+1);
} else {
/* Never true */
Warning ("Condition is never true");
AddCodeLine ("jsr return0");
}
}
return;
}
/* FALLTHROUGH */
case CF_INT:
if (flags & CF_UNSIGNED) {
/* Unsigned compare */
if (val == 0) {
/* If we have a compare > 0, we will replace it by
** != 0 here, since both are identical but the latter
** is easier to optimize.
*/
g_ne (flags, val);
} else if (val < 0xFFFF) {
/* Use >= instead of > because the former gives better
** code on the 6502 than the latter.
*/
g_ge (flags, val+1);
} else {
/* Never true */
Warning ("Condition is never true");
AddCodeLine ("jsr return0");
}
} else {
/* Signed compare */
if ((long) val < 0x7FFF) {
g_ge (flags, val+1);
} else {
/* Never true */
Warning ("Condition is never true");
AddCodeLine ("jsr return0");
}
}
return;
case CF_LONG:
if (flags & CF_UNSIGNED) {
/* Unsigned compare */
if (val == 0) {
/* If we have a compare > 0, we will replace it by
** != 0 here, since both are identical but the latter
** is easier to optimize.
*/
g_ne (flags, val);
} else if (val < 0xFFFFFFFF) {
/* Use >= instead of > because the former gives better
** code on the 6502 than the latter.
*/
g_ge (flags, val+1);
} else {
/* Never true */
Warning ("Condition is never true");
AddCodeLine ("jsr return0");
}
} else {
/* Signed compare */
if ((long) val < 0x7FFFFFFF) {
g_ge (flags, val+1);
} else {
/* Never true */
Warning ("Condition is never true");
AddCodeLine ("jsr return0");
}
}
return;
default:
typeerror (flags);
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
void g_ge (unsigned flags, unsigned long val)
/* Test for greater than or equal to */
{
static const char* const ops[4] = {
"tosgeax", "tosugeax", "tosgeeax", "tosugeeax"
};
unsigned Label;
/* If the right hand side is const, the lhs is not on stack but still
** in the primary register.
*/
if (flags & CF_CONST) {
/* Because the handling of the overflow flag is too complex for
** inlining, we can handle only unsigned compares, and signed
** compares against zero here.
*/
if (flags & CF_UNSIGNED) {
/* Give a warning in some special cases */
if (val == 0) {
Warning ("Condition is always true");
AddCodeLine ("jsr return1");
return;
}
/* Look at the type */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
/* Do a subtraction. Condition is true if carry set */
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
}
/* FALLTHROUGH */
case CF_INT:
/* Do a subtraction. Condition is true if carry set */
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
case CF_LONG:
/* Do a subtraction. Condition is true if carry set */
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("lda sreg");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 16));
AddCodeLine ("lda sreg+1");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 24));
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
default:
typeerror (flags);
}
} else if (val == 0) {
/* A signed compare against zero must only look at the sign bit */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
AddCodeLine ("tax");
AddCodeLine ("jsr boolge");
return;
}
/* FALLTHROUGH */
case CF_INT:
/* Just test the high byte */
AddCodeLine ("txa");
AddCodeLine ("jsr boolge");
return;
case CF_LONG:
/* Just test the high byte */
AddCodeLine ("lda sreg+1");
AddCodeLine ("jsr boolge");
return;
default:
typeerror (flags);
}
} else {
/* Signed compare against a constant != zero */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
if (flags & CF_FORCECHAR) {
Label = GetLocalLabel ();
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", (unsigned char)val);
AddCodeLine ("bvs %s", LocalLabelName (Label));
AddCodeLine ("eor #$80");
g_defcodelabel (Label);
AddCodeLine ("asl a"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
}
/* FALLTHROUGH */
case CF_INT:
/* Do a subtraction */
Label = GetLocalLabel ();
AddCodeLine ("cmp #$%02X", (unsigned char)val);
AddCodeLine ("txa");
AddCodeLine ("sbc #$%02X", (unsigned char)(val >> 8));
AddCodeLine ("bvs %s", LocalLabelName (Label));
AddCodeLine ("eor #$80");
g_defcodelabel (Label);
AddCodeLine ("asl a"); /* Bit 7 -> carry */
AddCodeLine ("lda #$00");
AddCodeLine ("ldx #$00");
AddCodeLine ("rol a");
return;
case CF_LONG:
/* This one is too costly */
break;
default:
typeerror (flags);
}
}
/* If we go here, we didn't emit code. Push the lhs on stack and fall
** into the normal, non-optimized stuff. Note: The standard stuff will
** always work with ints.
*/
flags &= ~CF_FORCECHAR;
g_push (flags & ~CF_CONST, 0);
}
/* Use long way over the stack */
oper (flags, val, ops);
}
/*****************************************************************************/
/* Allocating static storage */
/*****************************************************************************/
void g_res (unsigned n)
/* Reserve static storage, n bytes */
{
AddDataLine ("\t.res\t%u,$00", n);
}
void g_defdata (unsigned flags, uintptr_t val, long offs)
/* Define data with the size given in flags */
{
if (flags & CF_CONST) {
/* Numeric constant */
switch (flags & CF_TYPEMASK) {
case CF_CHAR:
AddDataLine ("\t.byte\t$%02"PRIXPTR, val & 0xFF);
break;
case CF_INT:
AddDataLine ("\t.word\t$%04"PRIXPTR, val & 0xFFFF);
break;
case CF_LONG:
AddDataLine ("\t.dword\t$%08"PRIXPTR, val & 0xFFFFFFFF);
break;
default:
typeerror (flags);
break;
}
} else {
/* Create the correct label name */
const char* Label = GetLabelName (flags, val, offs);
/* Labels are always 16 bit */
AddDataLine ("\t.addr\t%s", Label);
}
}
void g_defbytes (const void* Bytes, unsigned Count)
/* Output a row of bytes as a constant */
{
unsigned Chunk;
char Buf [128];
char* B;
/* Cast the buffer pointer */
const unsigned char* Data = (const unsigned char*) Bytes;
/* Output the stuff */
while (Count) {
/* How many go into this line? */
if ((Chunk = Count) > 16) {
Chunk = 16;
}
Count -= Chunk;
/* Output one line */
strcpy (Buf, "\t.byte\t");
B = Buf + 7;
do {
B += sprintf (B, "$%02X", *Data++);
if (--Chunk) {
*B++ = ',';
}
} while (Chunk);
/* Output the line */
AddDataLine ("%s", Buf);
}
}
void g_zerobytes (unsigned Count)
/* Output Count bytes of data initialized with zero */
{
if (Count > 0) {
AddDataLine ("\t.res\t%u,$00", Count);
}
}
void g_initregister (unsigned Label, unsigned Reg, unsigned Size)
/* Initialize a register variable from static initialization data */
{
/* Register variables do always have less than 128 bytes */
unsigned CodeLabel = GetLocalLabel ();
AddCodeLine ("ldx #$%02X", (unsigned char) (Size - 1));
g_defcodelabel (CodeLabel);
AddCodeLine ("lda %s,x", GetLabelName (CF_STATIC, Label, 0));
AddCodeLine ("sta %s,x", GetLabelName (CF_REGVAR, Reg, 0));
AddCodeLine ("dex");
AddCodeLine ("bpl %s", LocalLabelName (CodeLabel));
}
void g_initauto (unsigned Label, unsigned Size)
/* Initialize a local variable at stack offset zero from static data */
{
unsigned CodeLabel = GetLocalLabel ();
CheckLocalOffs (Size);
if (Size <= 128) {
AddCodeLine ("ldy #$%02X", Size-1);
g_defcodelabel (CodeLabel);
AddCodeLine ("lda %s,y", GetLabelName (CF_STATIC, Label, 0));
AddCodeLine ("sta (sp),y");
AddCodeLine ("dey");
AddCodeLine ("bpl %s", LocalLabelName (CodeLabel));
} else if (Size <= 256) {
AddCodeLine ("ldy #$00");
g_defcodelabel (CodeLabel);
AddCodeLine ("lda %s,y", GetLabelName (CF_STATIC, Label, 0));
AddCodeLine ("sta (sp),y");
AddCodeLine ("iny");
AddCmpCodeIfSizeNot256 ("cpy #$%02X", Size);
AddCodeLine ("bne %s", LocalLabelName (CodeLabel));
}
}
void g_initstatic (unsigned InitLabel, unsigned VarLabel, unsigned Size)
/* Initialize a static local variable from static initialization data */
{
if (Size <= 128) {
unsigned CodeLabel = GetLocalLabel ();
AddCodeLine ("ldy #$%02X", Size-1);
g_defcodelabel (CodeLabel);
AddCodeLine ("lda %s,y", GetLabelName (CF_STATIC, InitLabel, 0));
AddCodeLine ("sta %s,y", GetLabelName (CF_STATIC, VarLabel, 0));
AddCodeLine ("dey");
AddCodeLine ("bpl %s", LocalLabelName (CodeLabel));
} else if (Size <= 256) {
unsigned CodeLabel = GetLocalLabel ();
AddCodeLine ("ldy #$00");
g_defcodelabel (CodeLabel);
AddCodeLine ("lda %s,y", GetLabelName (CF_STATIC, InitLabel, 0));
AddCodeLine ("sta %s,y", GetLabelName (CF_STATIC, VarLabel, 0));
AddCodeLine ("iny");
AddCmpCodeIfSizeNot256 ("cpy #$%02X", Size);
AddCodeLine ("bne %s", LocalLabelName (CodeLabel));
} else {
/* Use the easy way here: memcpy() */
g_getimmed (CF_STATIC, VarLabel, 0);
AddCodeLine ("jsr pushax");
g_getimmed (CF_STATIC, InitLabel, 0);
AddCodeLine ("jsr pushax");
g_getimmed (CF_INT | CF_UNSIGNED | CF_CONST, Size, 0);
AddCodeLine ("jsr %s", GetLabelName (CF_EXTERNAL, (uintptr_t) "memcpy", 0));
}
}
/*****************************************************************************/
/* Bit-fields */
/*****************************************************************************/
void g_testbitfield (unsigned Flags, unsigned BitOffs, unsigned BitWidth)
/* Test bit-field in primary. */
{
/* Since the end is inclusive and cannot be negative here, we subtract 1 from the sum */
unsigned MSBit = BitOffs + BitWidth - 1U;
unsigned Bytes = MSBit / CHAR_BITS + 1U - BitOffs / CHAR_BITS;
unsigned HeadMask = (0xFF << (BitOffs % CHAR_BITS)) & 0xFF;
unsigned TailMask = ((1U << (MSBit % CHAR_BITS + 1U)) - 1U) & 0xFF;
unsigned UntestedBytes = ((1U << Bytes) - 1U) << (BitOffs / CHAR_BITS);
/* We don't use these flags for now. Could CF_NOKEEP be potentially interesting? */
Flags &= ~CF_STYPEMASK;
/* If we need to do a test, then we avoid shifting (ASR only shifts one bit at a time,
** so is slow) and just AND the head and tail bytes with the appropriate mask, then
** OR the results with the rest bytes.
*/
if (Bytes == 1) {
HeadMask = TailMask = HeadMask & TailMask;
}
/* Get the head byte */
switch (BitOffs / CHAR_BITS) {
case 0:
if (HeadMask == 0xFF && Bytes == 1) {
AddCodeLine ("tax");
UntestedBytes &= ~0x1;
}
break;
case 1:
if (HeadMask != 0xFF || TailMask == 0xFF) {
AddCodeLine ("txa");
UntestedBytes &= ~0x2;
}
break;
case 2:
if (HeadMask != 0xFF || TailMask == 0xFF) {
AddCodeLine ("lda sreg");
UntestedBytes &= ~0x4;
}
break;
case 3:
/* In this case we'd have HeadMask == TailMask and only 1 byte, but anyways... */
if (HeadMask != 0xFF || TailMask == 0xFF) {
AddCodeLine ("lda sreg+1");
UntestedBytes &= ~0x8;
}
break;
default:
break;
}
/* Keep in mind that the head is NOT always "Byte 0" */
if (HeadMask != 0xFF) {
AddCodeLine ("and #$%02X", HeadMask);
/* Abuse the "Byte 0" flag so that this head content will be saved by the routine */
UntestedBytes |= 0x1;
}
/* If there is only 1 byte to test, we have done with it */
if (Bytes == 1) {
return;
}
/* Handle the tail byte */
if (TailMask != 0xFF) {
/* If we have to do any more masking operation, register A will be used for that,
** and its current content in it must be saved.
*/
if (UntestedBytes & 0x1) {
AddCodeLine ("sta tmp1");
}
/* Test the tail byte */
switch (MSBit / CHAR_BITS) {
case 1:
AddCodeLine ("txa");
UntestedBytes &= ~0x2;
break;
case 2:
AddCodeLine ("lda sreg");
UntestedBytes &= ~0x4;
break;
case 3:
AddCodeLine ("lda sreg+1");
UntestedBytes &= ~0x8;
break;
default:
break;
}
AddCodeLine ("and #$%02X", TailMask);
if (UntestedBytes & 0x1) {
AddCodeLine ("ora tmp1");
}
}
/* OR the rest bytes together, which could never need masking */
if (UntestedBytes & 0x2) {
AddCodeLine ("stx tmp1");
AddCodeLine ("ora tmp1");
}
if (UntestedBytes & 0x4) {
AddCodeLine ("ora sreg");
}
if (UntestedBytes & 0x8) {
AddCodeLine ("ora sreg+1");
}
}
void g_extractbitfield (unsigned Flags, unsigned FullWidthFlags, int IsSigned,
unsigned BitOffs, unsigned BitWidth)
/* Extract bits from bit-field in primary. */
{
unsigned EndBit = BitOffs + BitWidth;
unsigned long ZeroExtendMask = 0; /* Zero if we don't need to zero-extend. */
/* Shift right by the bit offset; no code is emitted if BitOffs is zero */
g_asr (Flags | CF_CONST, BitOffs);
/* To zero-extend, we will and by the width if the field doesn't end on a char or
** int boundary. If it does end on a boundary, then zeros will have already been shifted in,
** but we need to clear the high byte for char. g_and emits no code if the mask is all ones.
** This is here so the signed and unsigned branches can use it.
*/
if (EndBit == CHAR_BITS) {
/* We need to clear the high byte, since CF_FORCECHAR was set. */
ZeroExtendMask = 0xFF;
} else if (EndBit != INT_BITS && EndBit != LONG_BITS) {
ZeroExtendMask = shl_l (1UL, BitWidth) - 1UL;
}
/* Handle signed bit-fields. */
if (IsSigned) {
unsigned SignBitPos = BitWidth - 1U;
unsigned SignBitByte = SignBitPos / CHAR_BITS;
unsigned SignBitPosInByte = SignBitPos % CHAR_BITS;
if (ZeroExtendMask != 0) {
/* The universal trick is:
** x = bits & bit_mask
** m = 1 << (bit_width - 1)
** r = (x ^ m) - m
** which works for long as well.
*/
if (SignBitByte + 1U == sizeofarg (FullWidthFlags)) {
/* We can just sign-extend on the high byte if it is the only affected one */
unsigned char SignBitMask = (1UL << SignBitPosInByte) & 0xFF;
unsigned char Mask = ((2UL << (SignBitPos % CHAR_BITS)) - 1UL) & 0xFF;
/* Move the correct byte to .A */
switch (SignBitByte) {
case 0:
break;
case 1:
AddCodeLine ("tay");
AddCodeLine ("txa");
break;
case 3:
AddCodeLine ("tay");
AddCodeLine ("lda sreg+1");
break;
default:
FAIL ("Invalid Byte for sign bit");
}
/* Use .A to do the ops on the correct byte */
AddCodeLine ("and #$%02X", Mask);
AddCodeLine ("eor #$%02X", SignBitMask);
AddCodeLine ("sec");
AddCodeLine ("sbc #$%02X", SignBitMask);
/* Move the correct byte from .A */
switch (SignBitByte) {
case 0:
break;
case 1:
AddCodeLine ("tax");
AddCodeLine ("tya");
break;
case 3:
AddCodeLine ("sta sreg+1");
AddCodeLine ("tya");
break;
default:
FAIL ("Invalid Byte for sign bit");
}
} else {
unsigned long SignBitMask = 1UL << SignBitPos;
unsigned long Mask = (2UL << SignBitPos) - 1UL;
g_and (FullWidthFlags | CF_CONST, Mask);
g_xor (FullWidthFlags | CF_CONST, SignBitMask);
g_dec (FullWidthFlags | CF_CONST, SignBitMask);
}
} else {
unsigned char SignBitMask = (1UL << SignBitPosInByte) & 0xFF;
unsigned ZeroExtendLabel = GetLocalLabel ();
/* Save .A because the sign-bit test will destroy it. */
AddCodeLine ("tay");
/* Move the correct byte to .A */
switch (SignBitByte) {
case 0:
break;
case 1:
AddCodeLine ("txa");
break;
case 3:
AddCodeLine ("lda sreg+1");
break;
default:
FAIL ("Invalid Byte for sign bit");
}
/* Test the sign bit */
AddCodeLine ("and #$%02X", SignBitMask);
AddCodeLine ("beq %s", LocalLabelName (ZeroExtendLabel));
if (SignBitByte + 1U == sizeofarg (FullWidthFlags)) {
/* We can just sign-extend on the high byte if it is the only affected one */
unsigned char Mask = ~((2UL << (SignBitPos % CHAR_BITS)) - 1UL) & 0xFF;
/* Use .A to do the ops on the correct byte */
switch (SignBitByte) {
case 0:
AddCodeLine ("tya");
AddCodeLine ("ora #$%02X", Mask);
/* We could jump over the following tya instead, but that wouldn't be faster
** than taking this extra tay and then the tya.
*/
AddCodeLine ("tay");
break;
case 1:
AddCodeLine ("txa");
AddCodeLine ("ora #$%02X", Mask);
AddCodeLine ("tax");
break;
case 3:
AddCodeLine ("lda sreg+1");
AddCodeLine ("ora #$%02X", Mask);
AddCodeLine ("sta sreg+1");
break;
default:
FAIL ("Invalid Byte for sign bit");
}
} else {
/* Since we are going to get back .A later anyways, we may just do the op on the
** higher bytes with whatever content currently in it.
*/
unsigned long Mask = ~((2UL << SignBitPos) - 1UL);
g_or (FullWidthFlags | CF_CONST, Mask);
}
/* Get back .A. We need to duplicate the TYA, rather than move it before
** the branch to share with the other label, because TYA changes some condition codes.
*/
g_defcodelabel (ZeroExtendLabel);
AddCodeLine ("tya");
}
} else {
/* Unsigned bit-field, needs only zero-extension. */
if (ZeroExtendMask != 0) {
g_and (FullWidthFlags | CF_CONST, ZeroExtendMask);
}
}
}
/*****************************************************************************/
/* Switch statement */
/*****************************************************************************/
void g_switch (Collection* Nodes, unsigned DefaultLabel, unsigned Depth)
/* Generate code for a switch statement */
{
unsigned NextLabel = 0;
unsigned I;
/* Setup registers and determine which compare insn to use */
const char* Compare;
switch (Depth) {
case 1:
Compare = "cmp #$%02X";
break;
case 2:
Compare = "cpx #$%02X";
break;
case 3:
AddCodeLine ("ldy sreg");
Compare = "cpy #$%02X";
break;
case 4:
AddCodeLine ("ldy sreg+1");
Compare = "cpy #$%02X";
break;
default:
Internal ("Invalid depth in g_switch: %u", Depth);
}
/* Walk over all nodes */
for (I = 0; I < CollCount (Nodes); ++I) {
/* Get the next case node */
CaseNode* N = CollAtUnchecked (Nodes, I);
/* If we have a next label, define it */
if (NextLabel) {
g_defcodelabel (NextLabel);
NextLabel = 0;
}
/* Do the compare */
AddCodeLine (Compare, CN_GetValue (N));
/* If this is the last level, jump directly to the case code if found */
if (Depth == 1) {
/* Branch if equal */
g_falsejump (0, CN_GetLabel (N));
} else {
/* Determine the next label */
if (I == CollCount (Nodes) - 1) {
/* Last node means not found */
g_truejump (0, DefaultLabel);
} else {
/* Jump to the next check */
NextLabel = GetLocalLabel ();
g_truejump (0, NextLabel);
}
/* Check the next level */
g_switch (N->Nodes, DefaultLabel, Depth-1);
}
}
/* If we go here, we haven't found the label */
g_jump (DefaultLabel);
}
/*****************************************************************************/
/* User supplied assembler code */
/*****************************************************************************/
void g_asmcode (struct StrBuf* B)
/* Output one line of assembler code. */
{
int len = (int) SB_GetLen(B);
const char *buf = SB_GetConstBuf(B);
/* remove whitespace at end of line */
/* NOTE: This masks problems in ParseInsn(), which in some cases seems to
rely on no whitespace being present at the end of a line in generated
code (see issue #1252). However, it generally seems to be a good
idea to remove trailing whitespace from (inline) assembly, so we
do it anyway. */
while (len) {
switch (buf[len - 1]) {
case '\n':
case ' ':
case '\t':
--len;
continue;
}
break;
}
AddCodeLine ("%.*s", len, buf);
}
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