/*****************************************************************************/ /* */ /* codeinfo.c */ /* */ /* Additional information about 6502 code */ /* */ /* */ /* */ /* (C) 2001-2012, 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 #include /* common */ #include "chartype.h" #include "coll.h" #include "debugflag.h" /* cc65 */ #include "codeent.h" #include "codeseg.h" #include "datatype.h" #include "error.h" #include "reginfo.h" #include "symtab.h" #include "codeinfo.h" /*****************************************************************************/ /* Data */ /*****************************************************************************/ /* 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 short Use; /* Register usage */ unsigned short Chg; /* Changed/destroyed registers */ }; /* Note for the shift functions: Shifts are done modulo 32, so all shift * routines are marked to use only the A register. The remainder is ignored * anyway. */ static const FuncInfo FuncInfoTable[] = { { "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 }, { "aslaxy", REG_AXY, REG_AXY | REG_TMP1 }, { "asleax1", REG_EAX, REG_EAX | REG_TMP1 }, { "asleax2", REG_EAX, REG_EAX | REG_TMP1 }, { "asleax3", REG_EAX, REG_EAX | REG_TMP1 }, { "asleax4", REG_EAX, REG_EAXY | REG_TMP1 }, { "asrax1", REG_AX, REG_AX | REG_TMP1 }, { "asrax2", REG_AX, REG_AX | REG_TMP1 }, { "asrax3", REG_AX, REG_AX | REG_TMP1 }, { "asrax4", REG_AX, REG_AX | REG_TMP1 }, { "asraxy", REG_AXY, REG_AXY | REG_TMP1 }, { "asreax1", REG_EAX, REG_EAX | REG_TMP1 }, { "asreax2", REG_EAX, REG_EAX | REG_TMP1 }, { "asreax3", REG_EAX, REG_EAX | REG_TMP1 }, { "asreax4", REG_EAX, REG_EAXY | 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 }, { "callax", REG_AX, REG_ALL }, { "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 }, { "incax3", REG_AX, REG_AXY | REG_TMP1 }, { "incax4", REG_AX, REG_AXY | REG_TMP1 }, { "incax5", REG_AX, REG_AXY | REG_TMP1 }, { "incax6", REG_AX, REG_AXY | REG_TMP1 }, { "incax7", REG_AX, REG_AXY | REG_TMP1 }, { "incax8", REG_AX, REG_AXY | REG_TMP1 }, { "incaxy", REG_AXY, REG_AXY | REG_TMP1 }, { "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 }, { "laddeq0sp", REG_EAX, REG_EAXY }, { "laddeq1", REG_Y | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI }, { "laddeqa", REG_AY | REG_PTR1_LO, REG_EAXY | REG_PTR1_HI }, { "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 }, { "leaa0sp", REG_A, REG_AX }, { "leaaxsp", REG_AX, 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 }, { "mulax10", REG_AX, REG_AX | REG_PTR1 }, { "mulax3", REG_AX, REG_AX | REG_PTR1 }, { "mulax5", REG_AX, REG_AX | REG_PTR1 }, { "mulax6", REG_AX, REG_AX | REG_PTR1 }, { "mulax7", REG_AX, REG_AX | REG_PTR1 }, { "mulax9", REG_AX, REG_AX | REG_PTR1 }, { "negax", REG_AX, REG_AX }, { "push0", REG_NONE, REG_AXY }, { "push0ax", REG_AX, REG_Y | REG_SREG }, { "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 }, { "pushaFF", REG_A, REG_Y }, { "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 }, { "pushl0", REG_NONE, REG_AXY }, { "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 }, { "return0", REG_NONE, REG_AX }, { "return1", REG_NONE, REG_AX }, { "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 }, { "shlaxy", REG_AXY, REG_AXY | REG_TMP1 }, { "shleax1", REG_EAX, REG_EAX | REG_TMP1 }, { "shleax2", REG_EAX, REG_EAX | REG_TMP1 }, { "shleax3", REG_EAX, REG_EAX | REG_TMP1 }, { "shleax4", REG_EAX, REG_EAXY | 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 }, { "shraxy", REG_AXY, REG_AXY | REG_TMP1 }, { "shreax1", REG_EAX, REG_EAX | REG_TMP1 }, { "shreax2", REG_EAX, REG_EAX | REG_TMP1 }, { "shreax3", REG_EAX, REG_EAX | REG_TMP1 }, { "shreax4", REG_EAX, REG_EAXY | REG_TMP1 }, { "staspidx", REG_A | REG_Y, REG_Y | REG_TMP1 | REG_PTR1 }, { "stax0sp", REG_AX, REG_Y }, { "staxspidx", REG_AXY, REG_TMP1 | REG_PTR1 }, { "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 }, { "subysp", REG_Y, REG_AY }, { "tosadd0ax", REG_AX, REG_EAXY | REG_TMP1 }, { "tosadda0", REG_A, REG_AXY }, { "tosaddax", REG_AX, REG_AXY }, { "tosaddeax", REG_EAX, REG_EAXY | REG_TMP1 }, { "tosand0ax", REG_AX, REG_EAXY | REG_TMP1 }, { "tosanda0", REG_A, REG_AXY }, { "tosandax", REG_AX, REG_AXY }, { "tosandeax", REG_EAX, REG_EAXY | REG_TMP1 }, { "tosaslax", REG_A, REG_AXY | REG_TMP1 }, { "tosasleax", REG_A, REG_EAXY | REG_TMP1 }, { "tosasrax", REG_A, REG_AXY | REG_TMP1 }, { "tosasreax", REG_A, REG_EAXY | REG_TMP1 }, { "tosdiv0ax", REG_AX, REG_ALL }, { "tosdiva0", REG_A, REG_ALL }, { "tosdivax", REG_AX, REG_ALL }, { "tosdiveax", REG_EAX, REG_ALL }, { "toseq00", REG_NONE, REG_AXY | REG_SREG }, { "toseqa0", REG_A, REG_AXY | REG_SREG }, { "toseqax", REG_AX, REG_AXY | REG_SREG }, { "toseqeax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosge00", REG_NONE, REG_AXY | REG_SREG }, { "tosgea0", REG_A, REG_AXY | REG_SREG }, { "tosgeax", REG_AX, REG_AXY | REG_SREG }, { "tosgeeax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosgt00", REG_NONE, REG_AXY | REG_SREG }, { "tosgta0", REG_A, REG_AXY | REG_SREG }, { "tosgtax", REG_AX, REG_AXY | REG_SREG }, { "tosgteax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosicmp", REG_AX, REG_AXY | REG_SREG }, { "tosicmp0", REG_A, REG_AXY | REG_SREG }, { "toslcmp", REG_EAX, REG_A | REG_Y | REG_PTR1 }, { "tosle00", REG_NONE, REG_AXY | REG_SREG }, { "toslea0", REG_A, REG_AXY | REG_SREG }, { "tosleax", REG_AX, REG_AXY | REG_SREG }, { "tosleeax", REG_EAX, REG_AXY | REG_PTR1 }, { "toslt00", REG_NONE, REG_AXY | REG_SREG }, { "toslta0", REG_A, REG_AXY | REG_SREG }, { "tosltax", REG_AX, REG_AXY | REG_SREG }, { "toslteax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosmod0ax", REG_AX, REG_ALL }, { "tosmodeax", REG_EAX, REG_ALL }, { "tosmul0ax", REG_AX, REG_ALL }, { "tosmula0", REG_A, REG_ALL }, { "tosmulax", REG_AX, REG_ALL }, { "tosmuleax", REG_EAX, REG_ALL }, { "tosne00", REG_NONE, REG_AXY | REG_SREG }, { "tosnea0", REG_A, REG_AXY | REG_SREG }, { "tosneax", REG_AX, REG_AXY | REG_SREG }, { "tosneeax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosor0ax", REG_AX, REG_EAXY | REG_TMP1 }, { "tosora0", REG_A, REG_AXY | REG_TMP1 }, { "tosorax", REG_AX, REG_AXY | REG_TMP1 }, { "tosoreax", REG_EAX, REG_EAXY | REG_TMP1 }, { "tosrsub0ax", REG_AX, REG_EAXY | REG_TMP1 }, { "tosrsuba0", REG_A, REG_AXY | REG_TMP1 }, { "tosrsubax", REG_AX, REG_AXY | REG_TMP1 }, { "tosrsubeax", REG_EAX, REG_EAXY | REG_TMP1 }, { "tosshlax", REG_A, REG_AXY | REG_TMP1 }, { "tosshleax", REG_A, REG_EAXY | REG_TMP1 }, { "tosshrax", REG_A, REG_AXY | REG_TMP1 }, { "tosshreax", REG_A, REG_EAXY | REG_TMP1 }, { "tossub0ax", REG_AX, REG_EAXY }, { "tossuba0", REG_A, REG_AXY }, { "tossubax", REG_AX, REG_AXY }, { "tossubeax", REG_EAX, REG_EAXY }, { "tosudiv0ax", REG_AX, REG_ALL & ~REG_SAVE }, { "tosudiva0", REG_A, REG_EAXY | REG_PTR1 }, /* also ptr4 */ { "tosudivax", REG_AX, REG_EAXY | REG_PTR1 }, /* also ptr4 */ { "tosudiveax", REG_EAX, REG_ALL & ~REG_SAVE }, { "tosuge00", REG_NONE, REG_AXY | REG_SREG }, { "tosugea0", REG_A, REG_AXY | REG_SREG }, { "tosugeax", REG_AX, REG_AXY | REG_SREG }, { "tosugeeax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosugt00", REG_NONE, REG_AXY | REG_SREG }, { "tosugta0", REG_A, REG_AXY | REG_SREG }, { "tosugtax", REG_AX, REG_AXY | REG_SREG }, { "tosugteax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosule00", REG_NONE, REG_AXY | REG_SREG }, { "tosulea0", REG_A, REG_AXY | REG_SREG }, { "tosuleax", REG_AX, REG_AXY | REG_SREG }, { "tosuleeax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosult00", REG_NONE, REG_AXY | REG_SREG }, { "tosulta0", REG_A, REG_AXY | REG_SREG }, { "tosultax", REG_AX, REG_AXY | REG_SREG }, { "tosulteax", REG_EAX, REG_AXY | REG_PTR1 }, { "tosumod0ax", REG_AX, REG_ALL & ~REG_SAVE }, { "tosumoda0", REG_A, REG_EAXY | REG_PTR1 }, /* also ptr4 */ { "tosumodax", REG_AX, REG_EAXY | REG_PTR1 }, /* also ptr4 */ { "tosumodeax", REG_EAX, REG_ALL & ~REG_SAVE }, { "tosumul0ax", REG_AX, REG_ALL }, { "tosumula0", REG_A, REG_ALL }, { "tosumulax", REG_AX, REG_ALL }, { "tosumuleax", REG_EAX, REG_ALL }, { "tosxor0ax", REG_AX, REG_EAXY | REG_TMP1 }, { "tosxora0", REG_A, REG_AXY | REG_TMP1 }, { "tosxorax", REG_AX, REG_AXY | REG_TMP1 }, { "tosxoreax", REG_EAX, REG_EAXY | REG_TMP1 }, { "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 */ /*****************************************************************************/ static int CompareFuncInfo (const void* Key, const void* Info) /* Compare function for bsearch */ { return strcmp (Key, ((const FuncInfo*) Info)->Name); } 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. */ { /* 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)) { FuncDesc* D = E->V.F.Func; /* 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. */ if (IsQualFastcall (E->Type) && 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 if (IsDigit (Name[0]) || Name[0] == '$') { /* A call to a numeric address. Assume that anything gets used and * destroyed. This is not a real problem, since numeric addresses * are used mostly in inline assembly anyway. */ *Use = REG_ALL; *Chg = REG_ALL; 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; } else { /* It's an internal function we have no information for. If in * debug mode, output an additional warning, so we have a chance * to fix it. Otherwise assume that the internal function will * use and change all registers. */ if (Debug) { fprintf (stderr, "No info about internal function `%s'\n", Name); } *Use = REG_ALL; *Chg = REG_ALL; } 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 { /* 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; } } 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 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_UBRA) != 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) & Wanted) == Wanted) { 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) { /* Recursively determine register usage at the branch target */ unsigned U1; unsigned U2; if (E->JumpTo) { /* Jump to internal label */ U1 = GetRegInfo2 (S, E->JumpTo->Owner, -1, Visited, Used, Unused, Wanted); } else { /* Jump to external label. This will effectively exit the * function, so we use the exitregs information here. */ U1 = S->ExitRegs; } /* Get the next entry */ if (Index < 0) { Index = CS_GetEntryIndex (S, E); } if ((E = CS_GetEntry (S, ++Index)) == 0) { Internal ("GetRegInfo2: No next entry!"); } /* Follow flow if branch not taken */ U2 = GetRegInfo2 (S, E, Index, Visited, Used, Unused, Wanted); /* Registers are used if they're use in any of the branches */ return U1 | U2; } 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!"); } } } /* Return to the caller the complement of all unused registers */ return Used; } 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 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); CE_ResetMark (E); CollDelete (Visited, NewCount); } /* Return the registers used */ return R; } 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 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); /* Initialize the data structure used to collection information */ InitCollection (&Visited); /* Call the recursive subfunction */ R = GetRegInfo1 (S, E, Index, &Visited, REG_NONE, REG_NONE, Wanted); /* Delete the line collection */ DoneCollection (&Visited); /* Return the registers used */ return R; } int RegAUsed (struct CodeSeg* S, unsigned Index) /* Check if the value in A is used. */ { 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) & REG_X) != 0; } int RegYUsed (struct CodeSeg* S, unsigned Index) /* Check if the value in Y is used. */ { 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_PTR1_LO) != 0) { return (RC == 0 || RC->Ptr1Lo >= 0)? REG_PTR1_LO : REG_NONE; } else if ((Use & REG_PTR1_HI) != 0) { return (RC == 0 || RC->Ptr1Hi >= 0)? REG_PTR1_HI : 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; } }