#include "coll.h"
/* cc65 */
+#include "codeent.h"
+#include "codeseg.h"
+#include "datatype.h"
+#include "error.h"
+#include "symtab.h"
#include "codeinfo.h"
};
static const FuncInfo FuncInfoTable[] = {
- { "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 },
- { "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 },
+ { "addysp", REG_Y, REG_NONE },
+ { "aslax1", REG_AX, REG_AX },
+ { "aslax2", REG_AX, REG_AX },
+ { "aslax3", REG_AX, REG_AX },
+ { "aslax4", REG_AX, REG_AX },
+ { "bnega", REG_A, REG_AX },
+ { "bnegax", REG_AX, REG_AX },
+ { "bnegeax", REG_AX, REG_AX },
+ { "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 },
+ { "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 },
+ { "ldaidx", REG_AXY, REG_AX },
+ { "ldauidx", REG_AXY, REG_AX },
+ { "ldax0sp", REG_Y, REG_AX },
+ { "ldaxi", REG_AX, REG_AXY },
+ { "ldaxidx", REG_AXY, REG_AX },
+ { "ldaxysp", REG_Y, REG_AX },
+ { "leaasp", REG_A, REG_AX },
+ { "negax", REG_AX, REG_AX },
+ { "pusha", REG_A, REG_Y },
+ { "pusha0", REG_A, REG_XY },
+ { "pushax", REG_AX, REG_Y },
+ { "pusheax", REG_AX, REG_Y },
+ { "pushw0sp", REG_NONE, REG_AXY },
+ { "pushwysp", REG_Y, REG_AXY },
+ { "shlax1", REG_AX, REG_AX },
+ { "shlax2", REG_AX, REG_AX },
+ { "shlax3", REG_AX, REG_AX },
+ { "shlax4", REG_AX, REG_AX },
+ { "shrax1", REG_AX, REG_AX },
+ { "shrax2", REG_AX, REG_AX },
+ { "shrax3", REG_AX, REG_AX },
+ { "shrax4", REG_AX, REG_AX },
+ { "shreax1", REG_AX, REG_AX },
+ { "shreax2", REG_AX, REG_AX },
+ { "shreax3", REG_AX, REG_AX },
+ { "shreax4", REG_AX, REG_AX },
+ { "staspidx", REG_A | REG_Y, REG_Y },
+ { "stax0sp", REG_AX, REG_Y },
+ { "tosicmp", REG_AX, REG_AXY },
+ { "tosdiva0", REG_AX, REG_AXY },
+ { "tosdivax", REG_AX, REG_AXY },
+ { "tosdiveax", REG_AX, REG_AXY },
+ { "tosmula0", REG_AX, REG_AXY },
+ { "tosmulax", REG_AX, REG_AXY },
+ { "tosmuleax", REG_AX, REG_AXY },
+ { "tosshreax", REG_AX, REG_AXY },
+ { "tosumula0", REG_AX, REG_AXY },
+ { "tosumulax", REG_AX, REG_AXY },
+ { "tosumuleax", REG_AX, REG_AXY },
};
#define FuncInfoCount (sizeof(FuncInfoTable) / sizeof(FuncInfoTable[0]))
-/* Structure used to pass information to the RegValUsedInt1 and 2 functions */
-typedef struct RVUInfo RVUInfo;
-struct RVUInfo {
- Collection VisitedLines; /* Lines already visited */
+/* Table with names of zero page locations used by the compiler */
+typedef struct ZPInfo ZPInfo;
+struct ZPInfo {
+ unsigned char Len; /* Length of the following string */
+ char Name[11]; /* Name of zero page symbol */
};
-
+static const ZPInfo ZPInfoTable[] = {
+ { 4, "ptr1" },
+ { 7, "regbank" },
+ { 7, "regsave" },
+ { 2, "sp" },
+ { 4, "sreg" },
+ { 4, "tmp1" },
+};
+#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.
+/* 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 */
+ SymEntry* LastParam = D->SymTab->SymTail;
+ if (SizeOf (LastParam->Type) == 1) {
+ *Use = REG_A;
+ } else {
+ *Use = REG_AX;
+ }
+ } 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_AXY;
+
+ /* Done */
+ return;
+ }
+
} else {
- *Use |= REG_AXY;
- *Chg |= REG_AXY;
+
+ /* 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 all registers used */
+ *Use = REG_AXY;
+ *Chg = REG_AXY;
}
-
-#if 0
-static unsigned RVUInt2 (Line* L,
- LineColl* LC, /* To remember visited lines */
- unsigned Used, /* Definitely used registers */
- unsigned Unused) /* Definitely unused registers */
-/* Subfunction for RegValUsed. Will be called recursively in case of branches. */
+
+int IsZPName (const char* Name)
+/* Return true if the given name is a zero page symbol */
{
- int I;
+ unsigned I;
+ const ZPInfo* Info;
+
+ /* Because of the low number of symbols, we do a linear search here */
+ for (I = 0, Info = ZPInfoTable; I < ZPInfoCount; ++I, ++Info) {
+ if (strncmp (Name, Info->Name, Info->Len) == 0 &&
+ (Name[Info->Len] == '\0' || Name[Info->Len] == '+')) {
+ /* Found */
+ return 1;
+ }
+ }
- /* Check the following instructions. We classifiy them into primary
- * loads (register value not used), neutral (check next instruction),
- * and unknown (assume register was used).
- */
- while (1) {
+ /* Not found */
+ return 0;
+}
- unsigned R;
-
- /* Get the next line and follow jumps */
- do {
-
- /* Handle jumps to local labels (continue there) */
- if (LineMatch (L, "\tjmp\tL") || LineMatch (L, "\tbra\tL")) {
- /* Get the target of the jump */
- L = GetTargetLine (L->Line+5);
- }
-
- /* Get the next line, skip local labels */
- do {
- L = NextCodeSegLine (L);
- } while (L && (IsLocalLabel (L) || L->Line[0] == '\0'));
-
- /* Bail out if we're done */
- if (L == 0 || IsExtLabel (L)) {
- /* End of function reached */
- goto ExitPoint;
- }
-
- /* Check if we had this line already. If so, bail out, if not,
- * add it to the list of known lines.
- */
- if (LCHasLine (LC, L) || !LCAddLine (LC, L)) {
- goto ExitPoint;
- }
-
- } while (LineMatch (L, "\tjmp\tL") || LineMatch (L, "\tbra\tL"));
-
- /* Special handling of code hints */
- if (IsHintLine (L)) {
-
- if (IsHint (L, "a:-") && (Used & REG_A) == 0) {
- Unused |= REG_A;
- } else if (IsHint (L, "x:-") && (Used & REG_X) == 0) {
- Unused |= REG_X;
- } else if (IsHint (L, "y:-") && (Used & REG_Y) == 0) {
- Unused |= REG_Y;
- }
-
- /* Special handling for branches */
- } else if (LineMatchX (L, ShortBranches) >= 0 ||
- LineMatchX (L, LongBranches) >= 0) {
- const char* Target = L->Line+5;
- if (Target[0] == 'L') {
- /* Jump to local label. Check the register usage starting at
- * the branch target and at the code following the branch.
- * All registers that are unused in both execution flows are
- * returned as unused.
- */
- unsigned U1, U2;
- U2 = RVUInt1 (GetTargetLine (Target), LC, Used, Unused);
- U1 = RVUInt1 (L, LC, Used, Unused);
- return U1 | U2; /* Used in any of the branches */
- }
- } else {
-
- /* Search for the instruction in this line */
- I = FindCmd (L);
-
- /* If we don't find it, assume all other registers are used */
- if (I < 0) {
- break;
- }
-
- /* Evaluate the use flags, check for addressing modes */
- R = CmdDesc[I].Use;
- if (IsXAddrMode (L)) {
- R |= REG_X;
- } else if (IsYAddrMode (L)) {
- R |= REG_Y;
- }
- if (R) {
- /* Remove registers that were already new loaded */
- R &= ~Unused;
-
- /* Remember the remaining registers */
- Used |= R;
- }
-
- /* Evaluate the load flags */
- R = CmdDesc[I].Load;
- if (R) {
- /* Remove registers that were already used */
- R &= ~Used;
-
- /* Remember the remaining registers */
- Unused |= R;
- }
- }
- /* If we know about all registers, bail out */
- if ((Used | Unused) == REG_ALL) {
+static unsigned char GetRegInfo2 (CodeSeg* S,
+ CodeEntry* E,
+ int Index,
+ Collection* Visited,
+ unsigned char Used,
+ unsigned char Unused)
+/* Recursively called subfunction for GetRegInfo. */
+{
+ /* Follow the instruction flow recording register usage. */
+ while (1) {
+
+ unsigned char R;
+
+ /* Check if we have already visited the current code entry. If so,
+ * bail out.
+ */
+ if (CE_HasMark (E)) {
+ break;
+ }
+
+ /* Mark this entry as already visited */
+ CE_SetMark (E);
+ CollAppend (Visited, E);
+
+ /* Evaluate the used registers */
+ 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.
+ */
+ R &= ~Unused;
+ /* Remember the remaining registers */
+ Used |= R;
+ }
+
+ /* Evaluate the changed registers */
+ if ((R = E->Chg) != REG_NONE) {
+ /* We are not interested in the use of any register that has been
+ * used before.
+ */
+ R &= ~Used;
+ /* Remember the remaining registers */
+ Unused |= R;
+ }
+
+ /* If we know about all registers now, bail out */
+ if ((Used | Unused) == REG_AXY) {
break;
}
+
+ /* If the instruction is an RTS or RTI, we're done */
+ if ((E->Info & OF_RET) != 0) {
+ break;
+ }
+
+ /* If we have an unconditional branch, follow this branch if possible,
+ * otherwise we're done.
+ */
+ if ((E->Info & OF_UBRA) != 0) {
+
+ /* Does this jump have a valid target? */
+ if (E->JumpTo) {
+
+ /* Unconditional jump */
+ E = E->JumpTo->Owner;
+ Index = -1; /* Invalidate */
+
+ } else {
+ /* Jump outside means we're done */
+ break;
+ }
+
+ /* In case of conditional branches, follow the branch if possible and
+ * follow the normal flow (branch not taken) afterwards. If we cannot
+ * follow the branch, we're done.
+ */
+ } else if ((E->Info & OF_CBRA) != 0) {
+
+ if (E->JumpTo) {
+
+ /* Recursively determine register usage at the branch target */
+ unsigned char U1;
+ unsigned char U2;
+
+ U1 = GetRegInfo2 (S, E->JumpTo->Owner, -1, Visited, Used, Unused);
+ if (U1 == REG_AXY) {
+ /* All registers used, no need for second call */
+ return REG_AXY;
+ }
+ if (Index < 0) {
+ Index = CS_GetEntryIndex (S, E);
+ }
+ if ((E = CS_GetEntry (S, ++Index)) == 0) {
+ Internal ("GetRegInfo2: No next entry!");
+ }
+ U2 = GetRegInfo2 (S, E, Index, Visited, Used, Unused);
+ return U1 | U2; /* Used in any of the branches */
+
+ } else {
+ /* Jump to global symbol */
+ break;
+ }
+
+ } else {
+
+ /* Just go to the next instruction */
+ if (Index < 0) {
+ Index = CS_GetEntryIndex (S, E);
+ }
+ E = CS_GetEntry (S, ++Index);
+ if (E == 0) {
+ /* No next entry */
+ Internal ("GetRegInfo2: No next entry!");
+ }
+
+ }
+
}
-ExitPoint:
/* Return to the caller the complement of all unused registers */
- return ~Unused & REG_ALL;
+ return Used;
}
-static unsigned RVUInt1 (Line* L,
- LineColl* LC, /* To remember visited lines */
- unsigned Used, /* Definitely used registers */
- unsigned Unused) /* Definitely unused registers */
-/* Subfunction for RegValUsed. Will be called recursively in case of branches. */
+static unsigned char GetRegInfo1 (CodeSeg* S,
+ CodeEntry* E,
+ int Index,
+ Collection* Visited,
+ unsigned char Used,
+ unsigned char Unused)
+/* Recursively called subfunction for GetRegInfo. */
{
/* Remember the current count of the line collection */
- unsigned Count = LC->Count;
+ unsigned Count = CollCount (Visited);
/* Call the worker routine */
- unsigned R = RVUInt2 (L, LC, Used, Unused);
-
- /* Restore the old count */
- LC->Count = Count;
+ unsigned char R = GetRegInfo2 (S, E, Index, Visited, Used, Unused);
+
+ /* Restore the old count, unmarking all new entries */
+ unsigned NewCount = CollCount (Visited);
+ while (NewCount-- > Count) {
+ CodeEntry* E = CollAt (Visited, NewCount);
+ CE_ResetMark (E);
+ CollDelete (Visited, NewCount);
+ }
- /* Return the result */
+ /* Return the registers used */
return R;
}
-static unsigned RegValUsed (Line* Start)
-/* Check the next instructions after the one in L for register usage. If
- * a register is used as an index, or in a store or other instruction, it
- * is assumed to be used. If a register is loaded with a value, before it
- * was used by one of the actions described above, it is assumed unused.
- * If the end of the lookahead is reached, all registers that are uncertain
- * are marked as used.
- * The result of the search is returned.
+unsigned char GetRegInfo (struct CodeSeg* S, unsigned Index)
+/* Determine register usage information for the instructions starting at the
+ * given index.
*/
{
- unsigned R;
+ CodeEntry* E;
+ Collection Visited; /* Visited entries */
+ unsigned char R;
+
+ /* Get the code entry for the given index */
+ if (Index >= CS_GetEntryCount (S)) {
+ /* There is no such code entry */
+ return REG_NONE;
+ }
+ E = CS_GetEntry (S, Index);
- /* Create a new line collection and enter the start line */
- LineColl* LC = NewLineColl (256);
- LCAddLine (LC, Start);
+ /* Initialize the data structure used to collection information */
+ InitCollection (&Visited);
/* Call the recursive subfunction */
- R = RVUInt1 (Start, LC, REG_NONE, REG_NONE);
+ R = GetRegInfo1 (S, E, Index, &Visited, REG_NONE, REG_NONE);
/* Delete the line collection */
- FreeLineColl (LC);
+ DoneCollection (&Visited);
/* Return the registers used */
return R;
-static int RegAUsed (Line* Start)
+int RegAUsed (struct CodeSeg* S, unsigned Index)
/* Check if the value in A is used. */
{
- return (RegValUsed (Start) & REG_A) != 0;
+ return (GetRegInfo (S, Index) & REG_A) != 0;
}
-static int RegXUsed (Line* Start)
+int RegXUsed (struct CodeSeg* S, unsigned Index)
/* Check if the value in X is used. */
{
- return (RegValUsed (Start) & REG_X) != 0;
+ return (GetRegInfo (S, Index) & REG_X) != 0;
}
-static int RegYUsed (Line* Start)
+int RegYUsed (struct CodeSeg* S, unsigned Index)
/* Check if the value in Y is used. */
{
- return (RegValUsed (Start) & REG_Y) != 0;
+ return (GetRegInfo (S, Index) & REG_Y) != 0;
}
-#endif
+
projects / cc65 / blobdiff