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/******************************************************************* ** t o o l s . c ** Forth Inspired Command Language - programming tools ** Author: John Sadler (john_sadler@alum.mit.edu) ** Created: 20 June 2000 ** $Id: tools.c,v 1.11 2001/12/05 07:21:34 jsadler Exp $ *******************************************************************/ /* ** Copyright (c) 1997-2001 John Sadler (john_sadler@alum.mit.edu) ** All rights reserved. ** ** Get the latest Ficl release at http://ficl.sourceforge.net ** ** I am interested in hearing from anyone who uses ficl. If you have ** a problem, a success story, a defect, an enhancement request, or ** if you would like to contribute to the ficl release, please ** contact me by email at the address above. ** ** L I C E N S E and D I S C L A I M E R ** ** Redistribution and use in source and binary forms, with or without ** modification, are permitted provided that the following conditions ** are met: ** 1. Redistributions of source code must retain the above copyright ** notice, this list of conditions and the following disclaimer. ** 2. Redistributions in binary form must reproduce the above copyright ** notice, this list of conditions and the following disclaimer in the ** documentation and/or other materials provided with the distribution. ** ** THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND ** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE ** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ** ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE ** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL ** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS ** OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) ** HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT ** LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY ** OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF ** SUCH DAMAGE. */ /* ** NOTES: ** SEE needs information about the addresses of functions that ** are the CFAs of colon definitions, constants, variables, DOES> ** words, and so on. It gets this information from a table and supporting ** functions in words.c. ** colonParen doDoes createParen variableParen userParen constantParen ** ** Step and break debugger for Ficl ** debug ( xt -- ) Start debugging an xt ** Set a breakpoint ** Specify breakpoint default action */ /* $FreeBSD: release/9.1.0/sys/boot/ficl/tools.c 167850 2007-03-23 22:26:01Z jkim $ */ #ifdef TESTMAIN #include <stdlib.h> #include <stdio.h> /* sprintf */ #include <ctype.h> #else #include <stand.h> #endif #include <string.h> #include "ficl.h" #if 0 /* ** nBREAKPOINTS sizes the breakpoint array. One breakpoint (bp 0) is reserved ** for the STEP command. The rest are user programmable. */ #define nBREAKPOINTS 32 #endif /************************************************************************** v m S e t B r e a k ** Set a breakpoint at the current value of IP by ** storing that address in a BREAKPOINT record **************************************************************************/ static void vmSetBreak(FICL_VM *pVM, FICL_BREAKPOINT *pBP) { FICL_WORD *pStep = ficlLookup(pVM->pSys, "step-break"); assert(pStep); pBP->address = pVM->ip; pBP->origXT = *pVM->ip; *pVM->ip = pStep; } /************************************************************************** ** d e b u g P r o m p t **************************************************************************/ static void debugPrompt(FICL_VM *pVM) { vmTextOut(pVM, "dbg> ", 0); } /************************************************************************** ** i s A F i c l W o r d ** Vet a candidate pointer carefully to make sure ** it's not some chunk o' inline data... ** It has to have a name, and it has to look ** like it's in the dictionary address range. ** NOTE: this excludes :noname words! **************************************************************************/ int isAFiclWord(FICL_DICT *pd, FICL_WORD *pFW) { if (!dictIncludes(pd, pFW)) return 0; if (!dictIncludes(pd, pFW->name)) return 0; if ((pFW->link != NULL) && !dictIncludes(pd, pFW->link)) return 0; if ((pFW->nName <= 0) || (pFW->name[pFW->nName] != '\0')) return 0; if (strlen(pFW->name) != pFW->nName) return 0; return 1; } #if 0 static int isPrimitive(FICL_WORD *pFW) { WORDKIND wk = ficlWordClassify(pFW); return ((wk != COLON) && (wk != DOES)); } #endif /************************************************************************** f i n d E n c l o s i n g W o r d ** Given a pointer to something, check to make sure it's an address in the ** dictionary. If so, search backwards until we find something that looks ** like a dictionary header. If successful, return the address of the ** FICL_WORD found. Otherwise return NULL. ** nSEARCH_CELLS sets the maximum neighborhood this func will search before giving up **************************************************************************/ #define nSEARCH_CELLS 100 static FICL_WORD *findEnclosingWord(FICL_VM *pVM, CELL *cp) { FICL_WORD *pFW; FICL_DICT *pd = vmGetDict(pVM); int i; if (!dictIncludes(pd, (void *)cp)) return NULL; for (i = nSEARCH_CELLS; i > 0; --i, --cp) { pFW = (FICL_WORD *)(cp + 1 - (sizeof (FICL_WORD) / sizeof (CELL))); if (isAFiclWord(pd, pFW)) return pFW; } return NULL; } /************************************************************************** s e e ** TOOLS ( "<spaces>name" -- ) ** Display a human-readable representation of the named word's definition. ** The source of the representation (object-code decompilation, source ** block, etc.) and the particular form of the display is implementation ** defined. **************************************************************************/ /* ** seeColon (for proctologists only) ** Walks a colon definition, decompiling ** on the fly. Knows about primitive control structures. */ static void seeColon(FICL_VM *pVM, CELL *pc) { char *cp; CELL *param0 = pc; FICL_DICT *pd = vmGetDict(pVM); FICL_WORD *pSemiParen = ficlLookup(pVM->pSys, "(;)"); assert(pSemiParen); for (; pc->p != pSemiParen; pc++) { FICL_WORD *pFW = (FICL_WORD *)(pc->p); cp = pVM->pad; if ((void *)pc == (void *)pVM->ip) *cp++ = '>'; else *cp++ = ' '; cp += sprintf(cp, "%3d ", pc-param0); if (isAFiclWord(pd, pFW)) { WORDKIND kind = ficlWordClassify(pFW); CELL c; switch (kind) { case LITERAL: c = *++pc; if (isAFiclWord(pd, c.p)) { FICL_WORD *pLit = (FICL_WORD *)c.p; sprintf(cp, "%.*s ( %#lx literal )", pLit->nName, pLit->name, c.u); } else sprintf(cp, "literal %ld (%#lx)", c.i, c.u); break; case STRINGLIT: { FICL_STRING *sp = (FICL_STRING *)(void *)++pc; pc = (CELL *)alignPtr(sp->text + sp->count + 1) - 1; sprintf(cp, "s\" %.*s\"", sp->count, sp->text); } break; case CSTRINGLIT: { FICL_STRING *sp = (FICL_STRING *)(void *)++pc; pc = (CELL *)alignPtr(sp->text + sp->count + 1) - 1; sprintf(cp, "c\" %.*s\"", sp->count, sp->text); } break; case IF: c = *++pc; if (c.i > 0) sprintf(cp, "if / while (branch %d)", pc+c.i-param0); else sprintf(cp, "until (branch %d)", pc+c.i-param0); break; case BRANCH: c = *++pc; if (c.i == 0) sprintf(cp, "repeat (branch %d)", pc+c.i-param0); else if (c.i == 1) sprintf(cp, "else (branch %d)", pc+c.i-param0); else sprintf(cp, "endof (branch %d)", pc+c.i-param0); break; case OF: c = *++pc; sprintf(cp, "of (branch %d)", pc+c.i-param0); break; case QDO: c = *++pc; sprintf(cp, "?do (leave %d)", (CELL *)c.p-param0); break; case DO: c = *++pc; sprintf(cp, "do (leave %d)", (CELL *)c.p-param0); break; case LOOP: c = *++pc; sprintf(cp, "loop (branch %d)", pc+c.i-param0); break; case PLOOP: c = *++pc; sprintf(cp, "+loop (branch %d)", pc+c.i-param0); break; default: sprintf(cp, "%.*s", pFW->nName, pFW->name); break; } } else /* probably not a word - punt and print value */ { sprintf(cp, "%ld ( %#lx )", pc->i, pc->u); } vmTextOut(pVM, pVM->pad, 1); } vmTextOut(pVM, ";", 1); } /* ** Here's the outer part of the decompiler. It's ** just a big nested conditional that checks the ** CFA of the word to decompile for each kind of ** known word-builder code, and tries to do ** something appropriate. If the CFA is not recognized, ** just indicate that it is a primitive. */ static void seeXT(FICL_VM *pVM) { FICL_WORD *pFW; WORDKIND kind; pFW = (FICL_WORD *)stackPopPtr(pVM->pStack); kind = ficlWordClassify(pFW); switch (kind) { case COLON: sprintf(pVM->pad, ": %.*s", pFW->nName, pFW->name); vmTextOut(pVM, pVM->pad, 1); seeColon(pVM, pFW->param); break; case DOES: vmTextOut(pVM, "does>", 1); seeColon(pVM, (CELL *)pFW->param->p); break; case CREATE: vmTextOut(pVM, "create", 1); break; case VARIABLE: sprintf(pVM->pad, "variable = %ld (%#lx)", pFW->param->i, pFW->param->u); vmTextOut(pVM, pVM->pad, 1); break; #if FICL_WANT_USER case USER: sprintf(pVM->pad, "user variable %ld (%#lx)", pFW->param->i, pFW->param->u); vmTextOut(pVM, pVM->pad, 1); break; #endif case CONSTANT: sprintf(pVM->pad, "constant = %ld (%#lx)", pFW->param->i, pFW->param->u); vmTextOut(pVM, pVM->pad, 1); default: sprintf(pVM->pad, "%.*s is a primitive", pFW->nName, pFW->name); vmTextOut(pVM, pVM->pad, 1); break; } if (pFW->flags & FW_IMMEDIATE) { vmTextOut(pVM, "immediate", 1); } if (pFW->flags & FW_COMPILE) { vmTextOut(pVM, "compile-only", 1); } return; } static void see(FICL_VM *pVM) { ficlTick(pVM); seeXT(pVM); return; } /************************************************************************** f i c l D e b u g X T ** debug ( xt -- ) ** Given an xt of a colon definition or a word defined by DOES>, set the ** VM up to debug the word: push IP, set the xt as the next thing to execute, ** set a breakpoint at its first instruction, and run to the breakpoint. ** Note: the semantics of this word are equivalent to "step in" **************************************************************************/ void ficlDebugXT(FICL_VM *pVM) { FICL_WORD *xt = stackPopPtr(pVM->pStack); WORDKIND wk = ficlWordClassify(xt); stackPushPtr(pVM->pStack, xt); seeXT(pVM); switch (wk) { case COLON: case DOES: /* ** Run the colon code and set a breakpoint at the next instruction */ vmExecute(pVM, xt); vmSetBreak(pVM, &(pVM->pSys->bpStep)); break; default: vmExecute(pVM, xt); break; } return; } /************************************************************************** s t e p I n ** FICL ** Execute the next instruction, stepping into it if it's a colon definition ** or a does> word. This is the easy kind of step. **************************************************************************/ void stepIn(FICL_VM *pVM) { /* ** Do one step of the inner loop */ { M_VM_STEP(pVM) } /* ** Now set a breakpoint at the next instruction */ vmSetBreak(pVM, &(pVM->pSys->bpStep)); return; } /************************************************************************** s t e p O v e r ** FICL ** Execute the next instruction atomically. This requires some insight into ** the memory layout of compiled code. Set a breakpoint at the next instruction ** in this word, and run until we hit it **************************************************************************/ void stepOver(FICL_VM *pVM) { FICL_WORD *pFW; WORDKIND kind; FICL_WORD *pStep = ficlLookup(pVM->pSys, "step-break"); assert(pStep); pFW = *pVM->ip; kind = ficlWordClassify(pFW); switch (kind) { case COLON: case DOES: /* ** assume that the next cell holds an instruction ** set a breakpoint there and return to the inner interp */ pVM->pSys->bpStep.address = pVM->ip + 1; pVM->pSys->bpStep.origXT = pVM->ip[1]; pVM->ip[1] = pStep; break; default: stepIn(pVM); break; } return; } /************************************************************************** s t e p - b r e a k ** FICL ** Handles breakpoints for stepped execution. ** Upon entry, bpStep contains the address and replaced instruction ** of the current breakpoint. ** Clear the breakpoint ** Get a command from the console. ** i (step in) - execute the current instruction and set a new breakpoint ** at the IP ** o (step over) - execute the current instruction to completion and set ** a new breakpoint at the IP ** g (go) - execute the current instruction and exit ** q (quit) - abort current word ** b (toggle breakpoint) **************************************************************************/ void stepBreak(FICL_VM *pVM) { STRINGINFO si; FICL_WORD *pFW; FICL_WORD *pOnStep; if (!pVM->fRestart) { assert(pVM->pSys->bpStep.address); assert(pVM->pSys->bpStep.origXT); /* ** Clear the breakpoint that caused me to run ** Restore the original instruction at the breakpoint, ** and restore the IP */ pVM->ip = (IPTYPE)(pVM->pSys->bpStep.address); *pVM->ip = pVM->pSys->bpStep.origXT; /* ** If there's an onStep, do it */ pOnStep = ficlLookup(pVM->pSys, "on-step"); if (pOnStep) ficlExecXT(pVM, pOnStep); /* ** Print the name of the next instruction */ pFW = pVM->pSys->bpStep.origXT; sprintf(pVM->pad, "next: %.*s", pFW->nName, pFW->name); #if 0 if (isPrimitive(pFW)) { strcat(pVM->pad, " ( primitive )"); } #endif vmTextOut(pVM, pVM->pad, 1); debugPrompt(pVM); } else { pVM->fRestart = 0; } si = vmGetWord(pVM); if (!strincmp(si.cp, "i", si.count)) { stepIn(pVM); } else if (!strincmp(si.cp, "g", si.count)) { return; } else if (!strincmp(si.cp, "l", si.count)) { FICL_WORD *xt; xt = findEnclosingWord(pVM, (CELL *)(pVM->ip)); if (xt) { stackPushPtr(pVM->pStack, xt); seeXT(pVM); } else { vmTextOut(pVM, "sorry - can't do that", 1); } vmThrow(pVM, VM_RESTART); } else if (!strincmp(si.cp, "o", si.count)) { stepOver(pVM); } else if (!strincmp(si.cp, "q", si.count)) { ficlTextOut(pVM, FICL_PROMPT, 0); vmThrow(pVM, VM_ABORT); } else if (!strincmp(si.cp, "x", si.count)) { /* ** Take whatever's left in the TIB and feed it to a subordinate ficlExec */ int ret; char *cp = pVM->tib.cp + pVM->tib.index; int count = pVM->tib.end - cp; FICL_WORD *oldRun = pVM->runningWord; ret = ficlExecC(pVM, cp, count); if (ret == VM_OUTOFTEXT) { ret = VM_RESTART; pVM->runningWord = oldRun; vmTextOut(pVM, "", 1); } vmThrow(pVM, ret); } else { vmTextOut(pVM, "i -- step In", 1); vmTextOut(pVM, "o -- step Over", 1); vmTextOut(pVM, "g -- Go (execute to completion)", 1); vmTextOut(pVM, "l -- List source code", 1); vmTextOut(pVM, "q -- Quit (stop debugging and abort)", 1); vmTextOut(pVM, "x -- eXecute the rest of the line as ficl words", 1); debugPrompt(pVM); vmThrow(pVM, VM_RESTART); } return; } /************************************************************************** b y e ** TOOLS ** Signal the system to shut down - this causes ficlExec to return ** VM_USEREXIT. The rest is up to you. **************************************************************************/ static void bye(FICL_VM *pVM) { vmThrow(pVM, VM_USEREXIT); return; } /************************************************************************** d i s p l a y S t a c k ** TOOLS ** Display the parameter stack (code for ".s") **************************************************************************/ static void displayPStack(FICL_VM *pVM) { FICL_STACK *pStk = pVM->pStack; int d = stackDepth(pStk); int i; CELL *pCell; vmCheckStack(pVM, 0, 0); if (d == 0) vmTextOut(pVM, "(Stack Empty) ", 0); else { pCell = pStk->base; for (i = 0; i < d; i++) { vmTextOut(pVM, ltoa((*pCell++).i, pVM->pad, pVM->base), 0); vmTextOut(pVM, " ", 0); } } return; } static void displayRStack(FICL_VM *pVM) { FICL_STACK *pStk = pVM->rStack; int d = stackDepth(pStk); int i; CELL *pCell; FICL_DICT *dp = vmGetDict(pVM); vmCheckStack(pVM, 0, 0); if (d == 0) vmTextOut(pVM, "(Stack Empty) ", 0); else { pCell = pStk->base; for (i = 0; i < d; i++) { CELL c = *pCell++; /* ** Attempt to find the word that contains the ** stacked address (as if it is part of a colon definition). ** If this works, print the name of the word. Otherwise print ** the value as a number. */ if (dictIncludes(dp, c.p)) { FICL_WORD *pFW = findEnclosingWord(pVM, c.p); if (pFW) { int offset = (CELL *)c.p - &pFW->param[0]; sprintf(pVM->pad, "%s+%d ", pFW->name, offset); vmTextOut(pVM, pVM->pad, 0); continue; /* no need to print the numeric value */ } } vmTextOut(pVM, ltoa(c.i, pVM->pad, pVM->base), 0); vmTextOut(pVM, " ", 0); } } return; } /************************************************************************** f o r g e t - w i d ** **************************************************************************/ static void forgetWid(FICL_VM *pVM) { FICL_DICT *pDict = vmGetDict(pVM); FICL_HASH *pHash; pHash = (FICL_HASH *)stackPopPtr(pVM->pStack); hashForget(pHash, pDict->here); return; } /************************************************************************** f o r g e t ** TOOLS EXT ( "<spaces>name" -- ) ** Skip leading space delimiters. Parse name delimited by a space. ** Find name, then delete name from the dictionary along with all ** words added to the dictionary after name. An ambiguous ** condition exists if name cannot be found. ** ** If the Search-Order word set is present, FORGET searches the ** compilation word list. An ambiguous condition exists if the ** compilation word list is deleted. **************************************************************************/ static void forget(FICL_VM *pVM) { void *where; FICL_DICT *pDict = vmGetDict(pVM); FICL_HASH *pHash = pDict->pCompile; ficlTick(pVM); where = ((FICL_WORD *)stackPopPtr(pVM->pStack))->name; hashForget(pHash, where); pDict->here = PTRtoCELL where; return; } /************************************************************************** l i s t W o r d s ** **************************************************************************/ #define nCOLWIDTH 8 static void listWords(FICL_VM *pVM) { FICL_DICT *dp = vmGetDict(pVM); FICL_HASH *pHash = dp->pSearch[dp->nLists - 1]; FICL_WORD *wp; int nChars = 0; int len; int y = 0; unsigned i; int nWords = 0; char *cp; char *pPad = pVM->pad; for (i = 0; i < pHash->size; i++) { for (wp = pHash->table[i]; wp != NULL; wp = wp->link, nWords++) { if (wp->nName == 0) /* ignore :noname defs */ continue; cp = wp->name; nChars += sprintf(pPad + nChars, "%s", cp); if (nChars > 70) { pPad[nChars] = '\0'; nChars = 0; y++; if(y>23) { y=0; vmTextOut(pVM, "--- Press Enter to continue ---",0); getchar(); vmTextOut(pVM,"\r",0); } vmTextOut(pVM, pPad, 1); } else { len = nCOLWIDTH - nChars % nCOLWIDTH; while (len-- > 0) pPad[nChars++] = ' '; } if (nChars > 70) { pPad[nChars] = '\0'; nChars = 0; y++; if(y>23) { y=0; vmTextOut(pVM, "--- Press Enter to continue ---",0); getchar(); vmTextOut(pVM,"\r",0); } vmTextOut(pVM, pPad, 1); } } } if (nChars > 0) { pPad[nChars] = '\0'; nChars = 0; vmTextOut(pVM, pPad, 1); } sprintf(pVM->pad, "Dictionary: %d words, %ld cells used of %u total", nWords, (long) (dp->here - dp->dict), dp->size); vmTextOut(pVM, pVM->pad, 1); return; } /************************************************************************** l i s t E n v ** Print symbols defined in the environment **************************************************************************/ static void listEnv(FICL_VM *pVM) { FICL_DICT *dp = pVM->pSys->envp; FICL_HASH *pHash = dp->pForthWords; FICL_WORD *wp; unsigned i; int nWords = 0; for (i = 0; i < pHash->size; i++) { for (wp = pHash->table[i]; wp != NULL; wp = wp->link, nWords++) { vmTextOut(pVM, wp->name, 1); } } sprintf(pVM->pad, "Environment: %d words, %ld cells used of %u total", nWords, (long) (dp->here - dp->dict), dp->size); vmTextOut(pVM, pVM->pad, 1); return; } /************************************************************************** e n v C o n s t a n t ** Ficl interface to ficlSetEnv and ficlSetEnvD - allow ficl code to set ** environment constants... **************************************************************************/ static void envConstant(FICL_VM *pVM) { unsigned value; #if FICL_ROBUST > 1 vmCheckStack(pVM, 1, 0); #endif vmGetWordToPad(pVM); value = POPUNS(); ficlSetEnv(pVM->pSys, pVM->pad, (FICL_UNS)value); return; } static void env2Constant(FICL_VM *pVM) { unsigned v1, v2; #if FICL_ROBUST > 1 vmCheckStack(pVM, 2, 0); #endif vmGetWordToPad(pVM); v2 = POPUNS(); v1 = POPUNS(); ficlSetEnvD(pVM->pSys, pVM->pad, v1, v2); return; } /************************************************************************** f i c l C o m p i l e T o o l s ** Builds wordset for debugger and TOOLS optional word set **************************************************************************/ void ficlCompileTools(FICL_SYSTEM *pSys) { FICL_DICT *dp = pSys->dp; assert (dp); /* ** TOOLS and TOOLS EXT */ dictAppendWord(dp, ".s", displayPStack, FW_DEFAULT); dictAppendWord(dp, "bye", bye, FW_DEFAULT); dictAppendWord(dp, "forget", forget, FW_DEFAULT); dictAppendWord(dp, "see", see, FW_DEFAULT); dictAppendWord(dp, "words", listWords, FW_DEFAULT); /* ** Set TOOLS environment query values */ ficlSetEnv(pSys, "tools", FICL_TRUE); ficlSetEnv(pSys, "tools-ext", FICL_FALSE); /* ** Ficl extras */ dictAppendWord(dp, "r.s", displayRStack, FW_DEFAULT); /* guy carver */ dictAppendWord(dp, ".env", listEnv, FW_DEFAULT); dictAppendWord(dp, "env-constant", envConstant, FW_DEFAULT); dictAppendWord(dp, "env-2constant", env2Constant, FW_DEFAULT); dictAppendWord(dp, "debug-xt", ficlDebugXT, FW_DEFAULT); dictAppendWord(dp, "parse-order", ficlListParseSteps, FW_DEFAULT); dictAppendWord(dp, "step-break",stepBreak, FW_DEFAULT); dictAppendWord(dp, "forget-wid",forgetWid, FW_DEFAULT); dictAppendWord(dp, "see-xt", seeXT, FW_DEFAULT); return; }