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cc65/src/cc65/codeinfo.c
Greg King a6b04f6e97 Changed most "backticks" (grave accents) into apostrophes. 
Quotations that are embraced by tick marks now look better, in most fonts.
2019-01-05 14:57:12 -05:00

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/*****************************************************************************/
/* */
/* codeinfo.c */
/* */
/* Additional information about 6502 code */
/* */
/* */
/* */
/* (C) 2001-2015, 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 <stdlib.h>
#include <string.h>
/* common */
#include "chartype.h"
#include "coll.h"
#include "debugflag.h"
/* cc65 */
#include "codeent.h"
#include "codeseg.h"
#include "datatype.h"
#include "error.h"
#include "global.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 variadic function will use the Y register (the parameter list
** size is passed there). A fastcall function will use the A or A/X
** registers. In all other cases, no registers are used. However,
** we assume that any function will destroy all registers.
*/
if ((D->Flags & FD_VARIADIC) != 0) {
*Use = REG_Y;
} else if (D->Flags & FD_CALL_WRAPPER) {
/* Wrappers may go to any functions, so mark them as using all
** registers.
*/
*Use = REG_EAXY;
} else if (D->ParamCount > 0 &&
(AutoCDecl ?
IsQualFastcall (E->Type) :
!IsQualCDecl (E->Type))) {
/* Will use registers depending on the last param. */
switch (CheckedSizeOf (D->LastParam->Type)) {
case 1u:
*Use = REG_A;
break;
case 2u:
*Use = REG_AX;
break;
default:
*Use = REG_EAX;
}
} 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;
}
}
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