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lua/ldebug.c

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/*
** $Id: ldebug.c,v 1.44 2000/10/05 12:14:08 roberto Exp roberto $
** Debug Interface
** See Copyright Notice in lua.h
*/
#include <stdlib.h>
#include "lua.h"
#include "lapi.h"
#include "lcode.h"
#include "ldebug.h"
#include "ldo.h"
#include "lfunc.h"
#include "lobject.h"
#include "lopcodes.h"
#include "lstate.h"
#include "lstring.h"
#include "ltable.h"
#include "ltm.h"
#include "luadebug.h"
static const char *getfuncname (lua_State *L, StkId f, const char **name);
static void setnormalized (TObject *d, const TObject *s) {
if (ttype(s) == LUA_TMARK) {
clvalue(d) = infovalue(s)->func;
ttype(d) = LUA_TFUNCTION;
}
else *d = *s;
}
static int isLmark (StkId o) {
return (o && ttype(o) == LUA_TMARK && !infovalue(o)->func->isC);
}
lua_Hook lua_setcallhook (lua_State *L, lua_Hook func) {
lua_Hook oldhook = L->callhook;
L->callhook = func;
return oldhook;
}
lua_Hook lua_setlinehook (lua_State *L, lua_Hook func) {
lua_Hook oldhook = L->linehook;
L->linehook = func;
return oldhook;
}
static StkId aux_stackedfunction (lua_State *L, int level, StkId top) {
int i;
for (i = (top-1) - L->stack; i>=0; i--) {
if (is_T_MARK(L->stack[i].ttype)) {
if (level == 0)
return L->stack+i;
level--;
}
}
return NULL;
}
int lua_getstack (lua_State *L, int level, lua_Debug *ar) {
StkId f = aux_stackedfunction(L, level, L->top);
if (f == NULL) return 0; /* there is no such level */
else {
ar->_func = f;
return 1;
}
}
static int lua_nups (StkId f) {
switch (ttype(f)) {
case LUA_TFUNCTION:
return clvalue(f)->nupvalues;
case LUA_TMARK:
return infovalue(f)->func->nupvalues;
default:
return 0;
}
}
int luaG_getline (int *lineinfo, int pc, int refline, int *prefi) {
int refi;
if (lineinfo == NULL) return -1; /* no line info */
else if (pc == -1) return refline; /* function preamble */
refi = prefi ? *prefi : 0;
if (lineinfo[refi] < 0)
refline += -lineinfo[refi++];
LUA_ASSERT(lineinfo[refi] >= 0, "invalid line info");
while (lineinfo[refi] > pc) {
refline--;
refi--;
if (lineinfo[refi] < 0)
refline -= -lineinfo[refi--];
LUA_ASSERT(lineinfo[refi] >= 0, "invalid line info");
}
for (;;) {
int nextline = refline + 1;
int nextref = refi + 1;
if (lineinfo[nextref] < 0)
nextline += -lineinfo[nextref++];
LUA_ASSERT(lineinfo[nextref] >= 0, "invalid line info");
if (lineinfo[nextref] > pc)
break;
refline = nextline;
refi = nextref;
}
if (prefi) *prefi = refi;
return refline;
}
static int lua_currentpc (StkId f) {
CallInfo *ci = infovalue(f);
LUA_ASSERT(isLmark(f), "function has no pc");
return (*ci->pc - ci->func->f.l->code) - 1;
}
static int lua_currentline (StkId f) {
if (!isLmark(f))
return -1; /* only active lua functions have current-line information */
else {
CallInfo *ci = infovalue(f);
int *lineinfo = ci->func->f.l->lineinfo;
return luaG_getline(lineinfo, lua_currentpc(f), 1, NULL);
}
}
static Proto *getluaproto (StkId f) {
return (isLmark(f) ? infovalue(f)->func->f.l : NULL);
}
const char *lua_getlocal (lua_State *L, const lua_Debug *ar, int localnum) {
const char *name;
StkId f = ar->_func;
Proto *fp = getluaproto(f);
if (!fp) return NULL; /* `f' is not a Lua function? */
name = luaF_getlocalname(fp, localnum, lua_currentpc(f));
if (!name) return NULL;
luaA_pushobject(L, (f+1)+(localnum-1)); /* push value */
return name;
}
const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int localnum) {
const char *name;
StkId f = ar->_func;
Proto *fp = getluaproto(f);
L->top--; /* pop new value */
if (!fp) return NULL; /* `f' is not a Lua function? */
name = luaF_getlocalname(fp, localnum, lua_currentpc(f));
if (!name || name[0] == '*') return NULL; /* `*' starts private locals */
*((f+1)+(localnum-1)) = *L->top;
return name;
}
static void infoLproto (lua_Debug *ar, Proto *f) {
ar->source = f->source->str;
ar->linedefined = f->lineDefined;
ar->what = "Lua";
}
static void lua_funcinfo (lua_State *L, lua_Debug *ar, StkId func) {
Closure *cl = NULL;
switch (ttype(func)) {
case LUA_TFUNCTION:
cl = clvalue(func);
break;
case LUA_TMARK:
cl = infovalue(func)->func;
break;
default:
lua_error(L, "value for `lua_getinfo' is not a function");
}
if (cl->isC) {
ar->source = "(C)";
ar->linedefined = -1;
ar->what = "C";
}
else
infoLproto(ar, cl->f.l);
luaO_chunkid(ar->short_src, ar->source, sizeof(ar->short_src));
if (ar->linedefined == 0)
ar->what = "main";
}
static const char *travtagmethods (lua_State *L, const TObject *o) {
if (ttype(o) == LUA_TFUNCTION) {
int e;
for (e=0; e<TM_N; e++) {
int t;
for (t=0; t<=L->last_tag; t++)
if (clvalue(o) == luaT_gettm(L, t, e))
return luaT_eventname[e];
}
}
return NULL;
}
static const char *travglobals (lua_State *L, const TObject *o) {
Hash *g = L->gt;
int i;
for (i=0; i<g->size; i++) {
if (luaO_equalObj(o, val(node(g, i))) &&
ttype(key(node(g, i))) == LUA_TSTRING)
return tsvalue(key(node(g, i)))->str;
}
return NULL;
}
static void lua_getname (lua_State *L, StkId f, lua_Debug *ar) {
TObject o;
setnormalized(&o, f);
/* try to find a name for given function */
if ((ar->name = travglobals(L, &o)) != NULL)
ar->namewhat = "global";
/* not found: try tag methods */
else if ((ar->name = travtagmethods(L, &o)) != NULL)
ar->namewhat = "tag-method";
else ar->namewhat = ""; /* not found at all */
}
int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) {
StkId func;
int isactive = (*what != '>');
if (isactive)
func = ar->_func;
else {
what++; /* skip the '>' */
func = L->top - 1;
}
for (; *what; what++) {
switch (*what) {
case 'S': {
lua_funcinfo(L, ar, func);
break;
}
case 'l': {
ar->currentline = lua_currentline(func);
break;
}
case 'u': {
ar->nups = lua_nups(func);
break;
}
case 'n': {
ar->namewhat = (isactive) ? getfuncname(L, func, &ar->name) : NULL;
if (ar->namewhat == NULL)
lua_getname(L, func, ar);
break;
}
case 'f': {
setnormalized(L->top, func);
incr_top; /* push function */
break;
}
default: return 0; /* invalid option */
}
}
if (!isactive) L->top--; /* pop function */
return 1;
}
/*
** {======================================================
** Symbolic Execution
** =======================================================
*/
static int pushpc (int *stack, int pc, int top, int n) {
while (n--)
stack[top++] = pc-1;
return top;
}
static Instruction luaG_symbexec (const Proto *pt, int lastpc, int stackpos) {
int stack[MAXSTACK]; /* stores last instruction that changed a stack entry */
const Instruction *code = pt->code;
int top = pt->numparams;
int pc = 0;
if (pt->is_vararg) /* varargs? */
top++; /* `arg' */
while (pc < lastpc) {
const Instruction i = code[pc++];
LUA_ASSERT(0 <= top && top <= pt->maxstacksize, "wrong stack");
switch (GET_OPCODE(i)) {
case OP_RETURN: {
LUA_ASSERT(top >= GETARG_U(i), "wrong stack");
top = GETARG_U(i);
break;
}
case OP_TAILCALL: {
LUA_ASSERT(top >= GETARG_A(i), "wrong stack");
top = GETARG_B(i);
break;
}
case OP_CALL: {
int nresults = GETARG_B(i);
if (nresults == MULT_RET) nresults = 1;
LUA_ASSERT(top >= GETARG_A(i), "wrong stack");
top = pushpc(stack, pc, GETARG_A(i), nresults);
break;
}
case OP_PUSHNIL: {
top = pushpc(stack, pc, top, GETARG_U(i));
break;
}
case OP_POP: {
top -= GETARG_U(i);
break;
}
case OP_SETTABLE:
case OP_SETLIST: {
top -= GETARG_B(i);
break;
}
case OP_SETMAP: {
top -= 2*GETARG_U(i);
break;
}
case OP_CONCAT: {
top -= GETARG_U(i);
stack[top++] = pc-1;
break;
}
case OP_CLOSURE: {
top -= GETARG_B(i);
stack[top++] = pc-1;
break;
}
case OP_JMPONT:
case OP_JMPONF: {
int newpc = pc + GETARG_S(i);
/* jump is forward and do not skip `lastpc'? */
if (pc < newpc && newpc <= lastpc) {
stack[top-1] = pc-1; /* value comes from `and'/`or' */
pc = newpc; /* do the jump */
}
else
top--; /* do not jump; pop value */
break;
}
default: {
OpCode op = GET_OPCODE(i);
LUA_ASSERT(luaK_opproperties[op].push != VD,
"invalid opcode for default");
top -= luaK_opproperties[op].pop;
LUA_ASSERT(top >= 0, "wrong stack");
top = pushpc(stack, pc, top, luaK_opproperties[op].push);
}
}
}
return code[stack[stackpos]];
}
static const char *getobjname (lua_State *L, StkId obj, const char **name) {
StkId func = aux_stackedfunction(L, 0, obj);
if (!isLmark(func))
return NULL; /* not an active Lua function */
else {
Proto *p = infovalue(func)->func->f.l;
int pc = lua_currentpc(func);
int stackpos = obj - (func+1); /* func+1 == function base */
Instruction i = luaG_symbexec(p, pc, stackpos);
LUA_ASSERT(pc != -1, "function must be active");
switch (GET_OPCODE(i)) {
case OP_GETGLOBAL: {
*name = p->kstr[GETARG_U(i)]->str;
return "global";
}
case OP_GETLOCAL: {
*name = luaF_getlocalname(p, GETARG_U(i)+1, pc);
LUA_ASSERT(*name, "local must exist");
return "local";
}
case OP_PUSHSELF:
case OP_GETDOTTED: {
*name = p->kstr[GETARG_U(i)]->str;
return "field";
}
default:
return NULL; /* no useful name found */
}
}
}
static const char *getfuncname (lua_State *L, StkId f, const char **name) {
StkId func = aux_stackedfunction(L, 0, f); /* calling function */
if (!isLmark(func))
return NULL; /* not an active Lua function */
else {
Proto *p = infovalue(func)->func->f.l;
int pc = lua_currentpc(func);
Instruction i;
if (pc == -1) return NULL; /* function is not activated */
i = p->code[pc];
switch (GET_OPCODE(i)) {
case OP_CALL: case OP_TAILCALL:
return getobjname(L, (func+1)+GETARG_A(i), name);
default:
return NULL; /* no useful name found */
}
}
}
/* }====================================================== */
void luaG_typeerror (lua_State *L, StkId o, const char *op) {
const char *name;
const char *kind = getobjname(L, o, &name);
const char *t = luaO_typename(o);
if (kind)
luaO_verror(L, "attempt to %.30s %.20s `%.40s' (a %.10s value)",
op, kind, name, t);
else
luaO_verror(L, "attempt to %.30s a %.10s value", op, t);
}
void luaG_binerror (lua_State *L, StkId p1, int t, const char *op) {
if (ttype(p1) == t) p1++;
LUA_ASSERT(ttype(p1) != t, "must be an error");
luaG_typeerror(L, p1, op);
}
void luaG_ordererror (lua_State *L, StkId top) {
const char *t1 = luaO_typename(top-2);
const char *t2 = luaO_typename(top-1);
if (t1[2] == t2[2])
luaO_verror(L, "attempt to compare two %.10s values", t1);
else
luaO_verror(L, "attempt to compare %.10s with %.10s", t1, t2);
}
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