/* */
/* */
/* */
-/* (C) 2001 Ullrich von Bassewitz */
+/* (C) 2001-2002 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* cc65 */
#include "codeent.h"
#include "codeseg.h"
+#include "datatype.h"
#include "error.h"
+#include "reginfo.h"
+#include "symtab.h"
#include "codeinfo.h"
+/* Table with the compare suffixes */
+static const char CmpSuffixTab [][4] = {
+ "eq", "ne", "gt", "ge", "lt", "le", "ugt", "uge", "ult", "ule"
+};
+
/* Table listing the function names and code info values for known internally
* used functions. This table should get auto-generated in the future.
*/
typedef struct FuncInfo FuncInfo;
struct FuncInfo {
const char* Name; /* Function name */
- unsigned char Use; /* Register usage */
- unsigned char Chg; /* Changed/destroyed registers */
+ unsigned short Use; /* Register usage */
+ unsigned short Chg; /* Changed/destroyed registers */
};
static const FuncInfo FuncInfoTable[] = {
- { "addysp", REG_Y, REG_NONE },
- { "booleq", REG_NONE, REG_AX },
- { "boolge", REG_NONE, REG_AX },
- { "boolgt", REG_NONE, REG_AX },
- { "boolle", REG_NONE, REG_AX },
- { "boollt", REG_NONE, REG_AX },
- { "boolne", REG_NONE, REG_AX },
- { "booluge", REG_NONE, REG_AX },
- { "boolugt", REG_NONE, REG_AX },
- { "boolule", REG_NONE, REG_AX },
- { "boolult", REG_NONE, REG_AX },
- { "decax1", REG_AX, REG_AX },
- { "decax2", REG_AX, REG_AX },
- { "decax3", REG_AX, REG_AX },
- { "decax4", REG_AX, REG_AX },
- { "decax5", REG_AX, REG_AX },
- { "decax6", REG_AX, REG_AX },
- { "decax7", REG_AX, REG_AX },
- { "decax8", REG_AX, REG_AX },
- { "decaxy", REG_AXY, REG_AX },
- { "decsp2", REG_NONE, REG_A },
- { "decsp3", REG_NONE, REG_A },
- { "decsp4", REG_NONE, REG_A },
- { "decsp5", REG_NONE, REG_A },
- { "decsp6", REG_NONE, REG_A },
- { "decsp7", REG_NONE, REG_A },
- { "decsp8", REG_NONE, REG_A },
- { "incsp1", REG_NONE, REG_NONE },
- { "incsp2", REG_NONE, REG_Y },
- { "incsp3", REG_NONE, REG_Y },
- { "incsp4", REG_NONE, REG_Y },
- { "incsp5", REG_NONE, REG_Y },
- { "incsp6", REG_NONE, REG_Y },
- { "incsp7", REG_NONE, REG_Y },
- { "incsp8", REG_NONE, REG_Y },
- { "ldax0sp", REG_Y, REG_AX },
- { "ldaxysp", REG_Y, REG_AX },
- { "pusha", REG_A, REG_Y },
- { "pusha0", REG_A, REG_XY },
- { "pushax", REG_AX, REG_Y },
- { "pushw0sp", REG_NONE, REG_AXY },
- { "pushwysp", REG_Y, REG_AXY },
- { "tosicmp", REG_AX, REG_AXY },
+ { "addeq0sp", REG_AX, REG_AXY },
+ { "addeqysp", REG_AXY, REG_AXY },
+ { "addysp", REG_Y, REG_NONE },
+ { "aslax1", REG_AX, REG_AX | REG_TMP1 },
+ { "aslax2", REG_AX, REG_AX | REG_TMP1 },
+ { "aslax3", REG_AX, REG_AX | REG_TMP1 },
+ { "aslax4", REG_AX, REG_AX | REG_TMP1 },
+ { "bnega", REG_A, REG_AX },
+ { "bnegax", REG_AX, REG_AX },
+ { "bnegeax", REG_EAX, REG_EAX },
+ { "booleq", REG_NONE, REG_AX },
+ { "boolge", REG_NONE, REG_AX },
+ { "boolgt", REG_NONE, REG_AX },
+ { "boolle", REG_NONE, REG_AX },
+ { "boollt", REG_NONE, REG_AX },
+ { "boolne", REG_NONE, REG_AX },
+ { "booluge", REG_NONE, REG_AX },
+ { "boolugt", REG_NONE, REG_AX },
+ { "boolule", REG_NONE, REG_AX },
+ { "boolult", REG_NONE, REG_AX },
+ { "complax", REG_AX, REG_AX },
+ { "decax1", REG_AX, REG_AX },
+ { "decax2", REG_AX, REG_AX },
+ { "decax3", REG_AX, REG_AX },
+ { "decax4", REG_AX, REG_AX },
+ { "decax5", REG_AX, REG_AX },
+ { "decax6", REG_AX, REG_AX },
+ { "decax7", REG_AX, REG_AX },
+ { "decax8", REG_AX, REG_AX },
+ { "decaxy", REG_AXY, REG_AX | REG_TMP1 },
+ { "deceaxy", REG_EAXY, REG_EAX },
+ { "decsp1", REG_NONE, REG_Y },
+ { "decsp2", REG_NONE, REG_A },
+ { "decsp3", REG_NONE, REG_A },
+ { "decsp4", REG_NONE, REG_A },
+ { "decsp5", REG_NONE, REG_A },
+ { "decsp6", REG_NONE, REG_A },
+ { "decsp7", REG_NONE, REG_A },
+ { "decsp8", REG_NONE, REG_A },
+ { "incax1", REG_AX, REG_AX },
+ { "incax2", REG_AX, REG_AX },
+ { "incsp1", REG_NONE, REG_NONE },
+ { "incsp2", REG_NONE, REG_Y },
+ { "incsp3", REG_NONE, REG_Y },
+ { "incsp4", REG_NONE, REG_Y },
+ { "incsp5", REG_NONE, REG_Y },
+ { "incsp6", REG_NONE, REG_Y },
+ { "incsp7", REG_NONE, REG_Y },
+ { "incsp8", REG_NONE, REG_Y },
+ { "laddeq", REG_EAXY|REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
+ { "laddeq1", REG_Y | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
+ { "laddeqa", REG_AY | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
+ { "laddeq0sp", REG_EAX, REG_EAXY },
+ { "laddeqysp", REG_EAXY, REG_EAXY },
+ { "ldaidx", REG_AXY, REG_AX | REG_PTR1 },
+ { "ldauidx", REG_AXY, REG_AX | REG_PTR1 },
+ { "ldax0sp", REG_NONE, REG_AXY },
+ { "ldaxi", REG_AX, REG_AXY | REG_PTR1 },
+ { "ldaxidx", REG_AXY, REG_AXY | REG_PTR1 },
+ { "ldaxysp", REG_Y, REG_AXY },
+ { "ldeax0sp", REG_NONE, REG_EAXY },
+ { "ldeaxi", REG_AX, REG_EAXY | REG_PTR1 },
+ { "ldeaxidx", REG_AXY, REG_EAXY | REG_PTR1 },
+ { "ldeaxysp", REG_Y, REG_EAXY },
+ { "leaasp", REG_A, REG_AX },
+ { "lsubeq", REG_EAXY|REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
+ { "lsubeq0sp", REG_EAX, REG_EAXY },
+ { "lsubeq1", REG_Y | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
+ { "lsubeqa", REG_AY | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI },
+ { "lsubeqysp", REG_EAXY, REG_EAXY },
+ { "lsubeq0sp", REG_EAX, REG_EAXY },
+ { "negax", REG_AX, REG_AX },
+ { "push0", REG_NONE, REG_AXY },
+ { "push1", REG_NONE, REG_AXY },
+ { "push2", REG_NONE, REG_AXY },
+ { "push3", REG_NONE, REG_AXY },
+ { "push4", REG_NONE, REG_AXY },
+ { "push5", REG_NONE, REG_AXY },
+ { "push6", REG_NONE, REG_AXY },
+ { "push7", REG_NONE, REG_AXY },
+ { "pusha", REG_A, REG_Y },
+ { "pusha0", REG_A, REG_XY },
+ { "pusha0sp", REG_NONE, REG_AY },
+ { "pushax", REG_AX, REG_Y },
+ { "pushaysp", REG_Y, REG_AY },
+ { "pushc0", REG_NONE, REG_A | REG_Y },
+ { "pushc1", REG_NONE, REG_A | REG_Y },
+ { "pushc2", REG_NONE, REG_A | REG_Y },
+ { "pusheax", REG_EAX, REG_Y },
+ { "pushw", REG_AX, REG_AXY | REG_PTR1 },
+ { "pushw0sp", REG_NONE, REG_AXY },
+ { "pushwidx", REG_AXY, REG_AXY | REG_PTR1 },
+ { "pushwysp", REG_Y, REG_AXY },
+ { "regswap", REG_AXY, REG_AXY | REG_TMP1 },
+ { "regswap1", REG_XY, REG_A },
+ { "regswap2", REG_XY, REG_A | REG_Y },
+ { "shlax1", REG_AX, REG_AX | REG_TMP1 },
+ { "shlax2", REG_AX, REG_AX | REG_TMP1 },
+ { "shlax3", REG_AX, REG_AX | REG_TMP1 },
+ { "shlax4", REG_AX, REG_AX | REG_TMP1 },
+ { "shrax1", REG_AX, REG_AX | REG_TMP1 },
+ { "shrax2", REG_AX, REG_AX | REG_TMP1 },
+ { "shrax3", REG_AX, REG_AX | REG_TMP1 },
+ { "shrax4", REG_AX, REG_AX | REG_TMP1 },
+ { "shreax1", REG_EAX, REG_AX | REG_TMP1 },
+ { "shreax2", REG_EAX, REG_AX | REG_TMP1 },
+ { "shreax3", REG_EAX, REG_AX | REG_TMP1 },
+ { "shreax4", REG_EAX, REG_AX | REG_TMP1 },
+ { "staspidx", REG_A | REG_Y, REG_Y | REG_TMP1 | REG_PTR1 },
+ { "stax0sp", REG_AX, REG_Y },
+ { "staxysp", REG_AXY, REG_Y },
+ { "steax0sp", REG_EAX, REG_Y },
+ { "steaxysp", REG_EAXY, REG_Y },
+ { "subeq0sp", REG_AX, REG_AXY },
+ { "subeqysp", REG_AXY, REG_AXY },
+ { "tosadda0", REG_A, REG_AXY },
+ { "tosaddax", REG_AX, REG_AXY },
+ { "tosanda0", REG_A, REG_AXY },
+ { "tosandax", REG_AX, REG_AXY },
+ { "tosdiva0", REG_AY, REG_ALL },
+ { "tosdivax", REG_AXY, REG_ALL },
+ { "tosdiveax", REG_EAXY, REG_ALL },
+ { "toseqeax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosgeeax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosgteax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosicmp", REG_AX, REG_AXY | REG_SREG },
+ { "toslcmp", REG_EAX, REG_A | REG_Y | REG_PTR1 },
+ { "tosleeax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "toslteax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosmula0", REG_AX, REG_ALL },
+ { "tosmulax", REG_AX, REG_ALL },
+ { "tosmuleax", REG_EAX, REG_ALL },
+ { "tosneeax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosshreax", REG_EAX, REG_EAXY | REG_PTR1 | REG_PTR2 },
+ { "tossuba0", REG_A, REG_AXY },
+ { "tossubax", REG_AX, REG_AXY },
+ { "tossubeax", REG_EAX, REG_EAXY },
+ { "tosugeeax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosugteax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosuleeax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosulteax", REG_EAX, REG_AXY | REG_PTR1 },
+ { "tosumula0", REG_AX, REG_ALL },
+ { "tosumulax", REG_AX, REG_ALL },
+ { "tosumuleax", REG_EAX, REG_ALL },
+ { "tsteax", REG_EAX, REG_Y },
+ { "utsteax", REG_EAX, REG_Y },
};
#define FuncInfoCount (sizeof(FuncInfoTable) / sizeof(FuncInfoTable[0]))
+/* Table with names of zero page locations used by the compiler */
+static const ZPInfo ZPInfoTable[] = {
+ { 0, "ptr1", REG_PTR1_LO, REG_PTR1 },
+ { 0, "ptr1+1", REG_PTR1_HI, REG_PTR1 },
+ { 0, "ptr2", REG_PTR2_LO, REG_PTR2 },
+ { 0, "ptr2+1", REG_PTR2_HI, REG_PTR2 },
+ { 4, "ptr3", REG_NONE, REG_NONE },
+ { 4, "ptr4", REG_NONE, REG_NONE },
+ { 7, "regbank", REG_NONE, REG_NONE },
+ { 0, "regsave", REG_SAVE_LO, REG_SAVE },
+ { 0, "regsave+1", REG_SAVE_HI, REG_SAVE },
+ { 0, "sp", REG_SP_LO, REG_SP },
+ { 0, "sp+1", REG_SP_HI, REG_SP },
+ { 0, "sreg", REG_SREG_LO, REG_SREG },
+ { 0, "sreg+1", REG_SREG_HI, REG_SREG },
+ { 0, "tmp1", REG_TMP1, REG_TMP1 },
+ { 0, "tmp2", REG_NONE, REG_NONE },
+ { 0, "tmp3", REG_NONE, REG_NONE },
+ { 0, "tmp4", REG_NONE, REG_NONE },
+};
+#define ZPInfoCount (sizeof(ZPInfoTable) / sizeof(ZPInfoTable[0]))
+
/*****************************************************************************/
-/* Code */
+/* Code */
/*****************************************************************************/
-void GetFuncInfo (const char* Name, unsigned char* Use, unsigned char* Chg)
-/* For the given function, lookup register information and combine it with
- * the information already in place. If the function is unknown, assume it
- * will use all registers and load all registers.
- * See codeinfo.h for possible flags.
+void GetFuncInfo (const char* Name, unsigned short* Use, unsigned short* Chg)
+/* For the given function, lookup register information and store it into
+ * the given variables. If the function is unknown, assume it will use and
+ * load all registers.
*/
{
- /* Search for the function */
- const FuncInfo* Info = bsearch (Name, FuncInfoTable, FuncInfoCount,
- sizeof(FuncInfo), CompareFuncInfo);
-
- /* Do we know the function? */
- if (Info) {
- /* Use the information we have */
- *Use |= Info->Use;
- *Chg |= Info->Chg;
+ /* If the function name starts with an underline, it is an external
+ * function. Search for it in the symbol table. If the function does
+ * not start with an underline, it may be a runtime support function.
+ * Search for it in the list of builtin functions.
+ */
+ if (Name[0] == '_') {
+
+ /* Search in the symbol table, skip the leading underscore */
+ SymEntry* E = FindGlobalSym (Name+1);
+
+ /* Did we find it in the top level table? */
+ if (E && IsTypeFunc (E->Type)) {
+
+ /* A function may use the A or A/X registers if it is a fastcall
+ * function. If it is not a fastcall function but a variadic one,
+ * it will use the Y register (the parameter size is passed here).
+ * In all other cases, no registers are used. However, we assume
+ * that any function will destroy all registers.
+ */
+ FuncDesc* D = E->V.F.Func;
+ if ((D->Flags & FD_FASTCALL) != 0 && D->ParamCount > 0) {
+ /* Will use registers depending on the last param */
+ unsigned LastParamSize = CheckedSizeOf (D->LastParam->Type);
+ if (LastParamSize == 1) {
+ *Use = REG_A;
+ } else if (LastParamSize == 2) {
+ *Use = REG_AX;
+ } else {
+ *Use = REG_EAX;
+ }
+ } else if ((D->Flags & FD_VARIADIC) != 0) {
+ *Use = REG_Y;
+ } else {
+ /* Will not use any registers */
+ *Use = REG_NONE;
+ }
+
+ /* Will destroy all registers */
+ *Chg = REG_ALL;
+
+ /* Done */
+ return;
+ }
+
+ } else {
+
+ /* Search for the function in the list of builtin functions */
+ const FuncInfo* Info = bsearch (Name, FuncInfoTable, FuncInfoCount,
+ sizeof(FuncInfo), CompareFuncInfo);
+
+ /* Do we know the function? */
+ if (Info) {
+ /* Use the information we have */
+ *Use = Info->Use;
+ *Chg = Info->Chg;
+ return;
+ }
+ }
+
+ /* Function not found - assume that the primary register is input, and all
+ * registers are changed
+ */
+ *Use = REG_EAXY;
+ *Chg = REG_ALL;
+}
+
+
+
+static int CompareZPInfo (const void* Name, const void* Info)
+/* Compare function for bsearch */
+{
+ /* Cast the pointers to the correct data type */
+ const char* N = (const char*) Name;
+ const ZPInfo* E = (const ZPInfo*) Info;
+
+ /* Do the compare. Be careful because of the length (Info may contain
+ * more than just the zeropage name).
+ */
+ if (E->Len == 0) {
+ /* Do a full compare */
+ return strcmp (N, E->Name);
} else {
- /* Assume all registers used */
- *Use |= REG_AXY;
- *Chg |= REG_AXY;
+ /* Only compare the first part */
+ int Res = strncmp (N, E->Name, E->Len);
+ if (Res == 0 && (N[E->Len] != '\0' && N[E->Len] != '+')) {
+ /* Name is actually longer than Info->Name */
+ Res = -1;
+ }
+ return Res;
}
}
-static unsigned char GetRegInfo2 (CodeSeg* S,
- CodeEntry* E,
- int Index,
- Collection* Visited,
- unsigned char Used,
- unsigned char Unused)
+const ZPInfo* GetZPInfo (const char* Name)
+/* If the given name is a zero page symbol, return a pointer to the info
+ * struct for this symbol, otherwise return NULL.
+ */
+{
+ /* Search for the zp location in the list */
+ return bsearch (Name, ZPInfoTable, ZPInfoCount,
+ sizeof(ZPInfo), CompareZPInfo);
+}
+
+
+
+static unsigned GetRegInfo2 (CodeSeg* S,
+ CodeEntry* E,
+ int Index,
+ Collection* Visited,
+ unsigned Used,
+ unsigned Unused,
+ unsigned Wanted)
/* Recursively called subfunction for GetRegInfo. */
{
/* Follow the instruction flow recording register usage. */
while (1) {
- unsigned char R;
+ unsigned R;
/* Check if we have already visited the current code entry. If so,
* bail out.
*/
- if (CodeEntryHasMark (E)) {
+ if (CE_HasMark (E)) {
break;
}
/* Mark this entry as already visited */
- CodeEntrySetMark (E);
+ CE_SetMark (E);
CollAppend (Visited, E);
/* Evaluate the used registers */
- if ((R = E->Use) != REG_NONE) {
+ R = E->Use;
+ if (E->OPC == OP65_RTS ||
+ ((E->Info & OF_BRA) != 0 && E->JumpTo == 0)) {
+ /* This instruction will leave the function */
+ R |= S->ExitRegs;
+ }
+ if (R != REG_NONE) {
/* We are not interested in the use of any register that has been
* used before.
*/
}
/* If we know about all registers now, bail out */
- if ((Used | Unused) == REG_AXY) {
+ if (((Used | Unused) & Wanted) == Wanted) {
break;
}
/* If the instruction is an RTS or RTI, we're done */
- if (E->OPC == OPC_RTS || E->OPC == OPC_RTI) {
+ if ((E->Info & OF_RET) != 0) {
break;
}
/* Unconditional jump */
E = E->JumpTo->Owner;
- Index = -1; /* Invalidate */
+ Index = -1; /* Invalidate */
} else {
/* Jump outside means we're done */
if (E->JumpTo) {
/* Recursively determine register usage at the branch target */
- unsigned char U1;
- unsigned char U2;
+ unsigned U1;
+ unsigned U2;
- U1 = GetRegInfo2 (S, E->JumpTo->Owner, -1, Visited, Used, Unused);
- if (U1 == REG_AXY) {
+ U1 = GetRegInfo2 (S, E->JumpTo->Owner, -1, Visited, Used, Unused, Wanted);
+ if (U1 == REG_ALL) {
/* All registers used, no need for second call */
return REG_AXY;
}
if (Index < 0) {
- Index = GetCodeEntryIndex (S, E);
+ Index = CS_GetEntryIndex (S, E);
}
- if ((E = GetCodeEntry (S, ++Index)) == 0) {
+ if ((E = CS_GetEntry (S, ++Index)) == 0) {
Internal ("GetRegInfo2: No next entry!");
}
- U2 = GetRegInfo2 (S, E, Index, Visited, Used, Unused);
+ U2 = GetRegInfo2 (S, E, Index, Visited, Used, Unused, Wanted);
return U1 | U2; /* Used in any of the branches */
} else {
/* Just go to the next instruction */
if (Index < 0) {
- Index = GetCodeEntryIndex (S, E);
+ Index = CS_GetEntryIndex (S, E);
}
- E = GetCodeEntry (S, ++Index);
+ E = CS_GetEntry (S, ++Index);
if (E == 0) {
/* No next entry */
Internal ("GetRegInfo2: No next entry!");
-static unsigned char GetRegInfo1 (CodeSeg* S,
- CodeEntry* E,
- int Index,
- Collection* Visited,
- unsigned char Used,
- unsigned char Unused)
+static unsigned GetRegInfo1 (CodeSeg* S,
+ CodeEntry* E,
+ int Index,
+ Collection* Visited,
+ unsigned Used,
+ unsigned Unused,
+ unsigned Wanted)
/* Recursively called subfunction for GetRegInfo. */
{
/* Remember the current count of the line collection */
unsigned Count = CollCount (Visited);
/* Call the worker routine */
- unsigned char R = GetRegInfo2 (S, E, Index, Visited, Used, Unused);
+ unsigned R = GetRegInfo2 (S, E, Index, Visited, Used, Unused, Wanted);
/* Restore the old count, unmarking all new entries */
unsigned NewCount = CollCount (Visited);
while (NewCount-- > Count) {
CodeEntry* E = CollAt (Visited, NewCount);
- CodeEntryResetMark (E);
+ CE_ResetMark (E);
CollDelete (Visited, NewCount);
}
-unsigned char GetRegInfo (struct CodeSeg* S, unsigned Index)
+unsigned GetRegInfo (struct CodeSeg* S, unsigned Index, unsigned Wanted)
/* Determine register usage information for the instructions starting at the
* given index.
*/
{
- CodeEntry* E;
- Collection Visited; /* Visited entries */
- unsigned char R;
+ CodeEntry* E;
+ Collection Visited; /* Visited entries */
+ unsigned R;
/* Get the code entry for the given index */
- if (Index >= GetCodeEntryCount (S)) {
+ if (Index >= CS_GetEntryCount (S)) {
/* There is no such code entry */
return REG_NONE;
}
- E = GetCodeEntry (S, Index);
+ E = CS_GetEntry (S, Index);
/* Initialize the data structure used to collection information */
InitCollection (&Visited);
/* Call the recursive subfunction */
- R = GetRegInfo1 (S, E, Index, &Visited, REG_NONE, REG_NONE);
+ R = GetRegInfo1 (S, E, Index, &Visited, REG_NONE, REG_NONE, Wanted);
/* Delete the line collection */
DoneCollection (&Visited);
int RegAUsed (struct CodeSeg* S, unsigned Index)
/* Check if the value in A is used. */
{
- return (GetRegInfo (S, Index) & REG_A) != 0;
+ return (GetRegInfo (S, Index, REG_A) & REG_A) != 0;
}
int RegXUsed (struct CodeSeg* S, unsigned Index)
/* Check if the value in X is used. */
{
- return (GetRegInfo (S, Index) & REG_X) != 0;
+ return (GetRegInfo (S, Index, REG_X) & REG_X) != 0;
}
int RegYUsed (struct CodeSeg* S, unsigned Index)
/* Check if the value in Y is used. */
{
- return (GetRegInfo (S, Index) & REG_Y) != 0;
+ return (GetRegInfo (S, Index, REG_Y) & REG_Y) != 0;
+}
+
+
+
+int RegAXUsed (struct CodeSeg* S, unsigned Index)
+/* Check if the value in A or(!) the value in X are used. */
+{
+ return (GetRegInfo (S, Index, REG_AX) & REG_AX) != 0;
+}
+
+
+
+int RegEAXUsed (struct CodeSeg* S, unsigned Index)
+/* Check if any of the four bytes in EAX are used. */
+{
+ return (GetRegInfo (S, Index, REG_EAX) & REG_EAX) != 0;
+}
+
+
+
+unsigned GetKnownReg (unsigned Use, const RegContents* RC)
+/* Return the register or zero page location from the set in Use, thats
+ * contents are known. If Use does not contain any register, or if the
+ * register in question does not have a known value, return REG_NONE.
+ */
+{
+ if ((Use & REG_A) != 0) {
+ return (RC == 0 || RC->RegA >= 0)? REG_A : REG_NONE;
+ } else if ((Use & REG_X) != 0) {
+ return (RC == 0 || RC->RegX >= 0)? REG_X : REG_NONE;
+ } else if ((Use & REG_Y) != 0) {
+ return (RC == 0 || RC->RegY >= 0)? REG_Y : REG_NONE;
+ } else if ((Use & REG_TMP1) != 0) {
+ return (RC == 0 || RC->Tmp1 >= 0)? REG_TMP1 : REG_NONE;
+ } else if ((Use & REG_SREG_LO) != 0) {
+ return (RC == 0 || RC->SRegLo >= 0)? REG_SREG_LO : REG_NONE;
+ } else if ((Use & REG_SREG_HI) != 0) {
+ return (RC == 0 || RC->SRegHi >= 0)? REG_SREG_HI : REG_NONE;
+ } else {
+ return REG_NONE;
+ }
+}
+
+
+
+static cmp_t FindCmpCond (const char* Code, unsigned CodeLen)
+/* Search for a compare condition by the given code using the given length */
+{
+ unsigned I;
+
+ /* Linear search */
+ for (I = 0; I < sizeof (CmpSuffixTab) / sizeof (CmpSuffixTab [0]); ++I) {
+ if (strncmp (Code, CmpSuffixTab [I], CodeLen) == 0) {
+ /* Found */
+ return I;
+ }
+ }
+
+ /* Not found */
+ return CMP_INV;
+}
+
+
+
+cmp_t FindBoolCmpCond (const char* Name)
+/* Check if the given string is the name of one of the boolean transformer
+ * subroutine, and if so, return the condition that is evaluated by this
+ * routine. Return CMP_INV if the condition is not recognised.
+ */
+{
+ /* Check for the correct subroutine name */
+ if (strncmp (Name, "bool", 4) == 0) {
+ /* Name is ok, search for the code in the table */
+ return FindCmpCond (Name+4, strlen(Name)-4);
+ } else {
+ /* Not found */
+ return CMP_INV;
+ }
+}
+
+
+
+cmp_t FindTosCmpCond (const char* Name)
+/* Check if this is a call to one of the TOS compare functions (tosgtax).
+ * Return the condition code or CMP_INV on failure.
+ */
+{
+ unsigned Len = strlen (Name);
+
+ /* Check for the correct subroutine name */
+ if (strncmp (Name, "tos", 3) == 0 && strcmp (Name+Len-2, "ax") == 0) {
+ /* Name is ok, search for the code in the table */
+ return FindCmpCond (Name+3, Len-3-2);
+ } else {
+ /* Not found */
+ return CMP_INV;
+ }
}
projects / cc65 / blobdiff