diff options
Diffstat (limited to 'contrib/lua/src/ldebug.c')
| -rw-r--r-- | contrib/lua/src/ldebug.c | 231 |
1 files changed, 139 insertions, 92 deletions
diff --git a/contrib/lua/src/ldebug.c b/contrib/lua/src/ldebug.c index 28b1caabf77e..7264fce8a55c 100644 --- a/contrib/lua/src/ldebug.c +++ b/contrib/lua/src/ldebug.c @@ -31,12 +31,15 @@ -#define noLuaClosure(f) ((f) == NULL || (f)->c.tt == LUA_VCCL) +#define LuaClosure(f) ((f) != NULL && (f)->c.tt == LUA_VLCL) static const char *funcnamefromcall (lua_State *L, CallInfo *ci, const char **name); +static const char strlocal[] = "local"; +static const char strupval[] = "upvalue"; + static int currentpc (CallInfo *ci) { lua_assert(isLua(ci)); @@ -254,7 +257,7 @@ LUA_API const char *lua_setlocal (lua_State *L, const lua_Debug *ar, int n) { static void funcinfo (lua_Debug *ar, Closure *cl) { - if (noLuaClosure(cl)) { + if (!LuaClosure(cl)) { ar->source = "=[C]"; ar->srclen = LL("=[C]"); ar->linedefined = -1; @@ -288,29 +291,31 @@ static int nextline (const Proto *p, int currentline, int pc) { static void collectvalidlines (lua_State *L, Closure *f) { - if (noLuaClosure(f)) { + if (!LuaClosure(f)) { setnilvalue(s2v(L->top.p)); api_incr_top(L); } else { - int i; - TValue v; const Proto *p = f->l.p; int currentline = p->linedefined; Table *t = luaH_new(L); /* new table to store active lines */ sethvalue2s(L, L->top.p, t); /* push it on stack */ api_incr_top(L); - setbtvalue(&v); /* boolean 'true' to be the value of all indices */ - if (!p->is_vararg) /* regular function? */ - i = 0; /* consider all instructions */ - else { /* vararg function */ - lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP); - currentline = nextline(p, currentline, 0); - i = 1; /* skip first instruction (OP_VARARGPREP) */ - } - for (; i < p->sizelineinfo; i++) { /* for each instruction */ - currentline = nextline(p, currentline, i); /* get its line */ - luaH_setint(L, t, currentline, &v); /* table[line] = true */ + if (p->lineinfo != NULL) { /* proto with debug information? */ + int i; + TValue v; + setbtvalue(&v); /* boolean 'true' to be the value of all indices */ + if (!p->is_vararg) /* regular function? */ + i = 0; /* consider all instructions */ + else { /* vararg function */ + lua_assert(GET_OPCODE(p->code[0]) == OP_VARARGPREP); + currentline = nextline(p, currentline, 0); + i = 1; /* skip first instruction (OP_VARARGPREP) */ + } + for (; i < p->sizelineinfo; i++) { /* for each instruction */ + currentline = nextline(p, currentline, i); /* get its line */ + luaH_setint(L, t, currentline, &v); /* table[line] = true */ + } } } } @@ -339,7 +344,7 @@ static int auxgetinfo (lua_State *L, const char *what, lua_Debug *ar, } case 'u': { ar->nups = (f == NULL) ? 0 : f->c.nupvalues; - if (noLuaClosure(f)) { + if (!LuaClosure(f)) { ar->isvararg = 1; ar->nparams = 0; } @@ -417,40 +422,6 @@ LUA_API int lua_getinfo (lua_State *L, const char *what, lua_Debug *ar) { ** ======================================================= */ -static const char *getobjname (const Proto *p, int lastpc, int reg, - const char **name); - - -/* -** Find a "name" for the constant 'c'. -*/ -static void kname (const Proto *p, int c, const char **name) { - TValue *kvalue = &p->k[c]; - *name = (ttisstring(kvalue)) ? svalue(kvalue) : "?"; -} - - -/* -** Find a "name" for the register 'c'. -*/ -static void rname (const Proto *p, int pc, int c, const char **name) { - const char *what = getobjname(p, pc, c, name); /* search for 'c' */ - if (!(what && *what == 'c')) /* did not find a constant name? */ - *name = "?"; -} - - -/* -** Find a "name" for a 'C' value in an RK instruction. -*/ -static void rkname (const Proto *p, int pc, Instruction i, const char **name) { - int c = GETARG_C(i); /* key index */ - if (GETARG_k(i)) /* is 'c' a constant? */ - kname(p, c, name); - else /* 'c' is a register */ - rname(p, pc, c, name); -} - static int filterpc (int pc, int jmptarget) { if (pc < jmptarget) /* is code conditional (inside a jump)? */ @@ -509,28 +480,29 @@ static int findsetreg (const Proto *p, int lastpc, int reg) { /* -** Check whether table being indexed by instruction 'i' is the -** environment '_ENV' +** Find a "name" for the constant 'c'. */ -static const char *gxf (const Proto *p, int pc, Instruction i, int isup) { - int t = GETARG_B(i); /* table index */ - const char *name; /* name of indexed variable */ - if (isup) /* is an upvalue? */ - name = upvalname(p, t); - else - getobjname(p, pc, t, &name); - return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field"; +static const char *kname (const Proto *p, int index, const char **name) { + TValue *kvalue = &p->k[index]; + if (ttisstring(kvalue)) { + *name = getstr(tsvalue(kvalue)); + return "constant"; + } + else { + *name = "?"; + return NULL; + } } -static const char *getobjname (const Proto *p, int lastpc, int reg, - const char **name) { - int pc; - *name = luaF_getlocalname(p, reg + 1, lastpc); +static const char *basicgetobjname (const Proto *p, int *ppc, int reg, + const char **name) { + int pc = *ppc; + *name = luaF_getlocalname(p, reg + 1, pc); if (*name) /* is a local? */ - return "local"; + return strlocal; /* else try symbolic execution */ - pc = findsetreg(p, lastpc, reg); + *ppc = pc = findsetreg(p, pc, reg); if (pc != -1) { /* could find instruction? */ Instruction i = p->code[pc]; OpCode op = GET_OPCODE(i); @@ -538,18 +510,86 @@ static const char *getobjname (const Proto *p, int lastpc, int reg, case OP_MOVE: { int b = GETARG_B(i); /* move from 'b' to 'a' */ if (b < GETARG_A(i)) - return getobjname(p, pc, b, name); /* get name for 'b' */ + return basicgetobjname(p, ppc, b, name); /* get name for 'b' */ break; } + case OP_GETUPVAL: { + *name = upvalname(p, GETARG_B(i)); + return strupval; + } + case OP_LOADK: return kname(p, GETARG_Bx(i), name); + case OP_LOADKX: return kname(p, GETARG_Ax(p->code[pc + 1]), name); + default: break; + } + } + return NULL; /* could not find reasonable name */ +} + + +/* +** Find a "name" for the register 'c'. +*/ +static void rname (const Proto *p, int pc, int c, const char **name) { + const char *what = basicgetobjname(p, &pc, c, name); /* search for 'c' */ + if (!(what && *what == 'c')) /* did not find a constant name? */ + *name = "?"; +} + + +/* +** Find a "name" for a 'C' value in an RK instruction. +*/ +static void rkname (const Proto *p, int pc, Instruction i, const char **name) { + int c = GETARG_C(i); /* key index */ + if (GETARG_k(i)) /* is 'c' a constant? */ + kname(p, c, name); + else /* 'c' is a register */ + rname(p, pc, c, name); +} + + +/* +** Check whether table being indexed by instruction 'i' is the +** environment '_ENV'. If the table is an upvalue, get its name; +** otherwise, find some "name" for the table and check whether +** that name is the name of a local variable (and not, for instance, +** a string). Then check that, if there is a name, it is '_ENV'. +*/ +static const char *isEnv (const Proto *p, int pc, Instruction i, int isup) { + int t = GETARG_B(i); /* table index */ + const char *name; /* name of indexed variable */ + if (isup) /* is 't' an upvalue? */ + name = upvalname(p, t); + else { /* 't' is a register */ + const char *what = basicgetobjname(p, &pc, t, &name); + if (what != strlocal && what != strupval) + name = NULL; /* cannot be the variable _ENV */ + } + return (name && strcmp(name, LUA_ENV) == 0) ? "global" : "field"; +} + + +/* +** Extend 'basicgetobjname' to handle table accesses +*/ +static const char *getobjname (const Proto *p, int lastpc, int reg, + const char **name) { + const char *kind = basicgetobjname(p, &lastpc, reg, name); + if (kind != NULL) + return kind; + else if (lastpc != -1) { /* could find instruction? */ + Instruction i = p->code[lastpc]; + OpCode op = GET_OPCODE(i); + switch (op) { case OP_GETTABUP: { int k = GETARG_C(i); /* key index */ kname(p, k, name); - return gxf(p, pc, i, 1); + return isEnv(p, lastpc, i, 1); } case OP_GETTABLE: { int k = GETARG_C(i); /* key index */ - rname(p, pc, k, name); - return gxf(p, pc, i, 0); + rname(p, lastpc, k, name); + return isEnv(p, lastpc, i, 0); } case OP_GETI: { *name = "integer index"; @@ -558,24 +598,10 @@ static const char *getobjname (const Proto *p, int lastpc, int reg, case OP_GETFIELD: { int k = GETARG_C(i); /* key index */ kname(p, k, name); - return gxf(p, pc, i, 0); - } - case OP_GETUPVAL: { - *name = upvalname(p, GETARG_B(i)); - return "upvalue"; - } - case OP_LOADK: - case OP_LOADKX: { - int b = (op == OP_LOADK) ? GETARG_Bx(i) - : GETARG_Ax(p->code[pc + 1]); - if (ttisstring(&p->k[b])) { - *name = svalue(&p->k[b]); - return "constant"; - } - break; + return isEnv(p, lastpc, i, 0); } case OP_SELF: { - rkname(p, pc, i, name); + rkname(p, lastpc, i, name); return "method"; } default: break; /* go through to return NULL */ @@ -627,7 +653,7 @@ static const char *funcnamefromcode (lua_State *L, const Proto *p, default: return NULL; /* cannot find a reasonable name */ } - *name = getstr(G(L)->tmname[tm]) + 2; + *name = getshrstr(G(L)->tmname[tm]) + 2; return "metamethod"; } @@ -684,7 +710,7 @@ static const char *getupvalname (CallInfo *ci, const TValue *o, for (i = 0; i < c->nupvalues; i++) { if (c->upvals[i]->v.p == o) { *name = upvalname(c->p, i); - return "upvalue"; + return strupval; } } return NULL; @@ -866,6 +892,28 @@ static int changedline (const Proto *p, int oldpc, int newpc) { /* +** Traces Lua calls. If code is running the first instruction of a function, +** and function is not vararg, and it is not coming from an yield, +** calls 'luaD_hookcall'. (Vararg functions will call 'luaD_hookcall' +** after adjusting its variable arguments; otherwise, they could call +** a line/count hook before the call hook. Functions coming from +** an yield already called 'luaD_hookcall' before yielding.) +*/ +int luaG_tracecall (lua_State *L) { + CallInfo *ci = L->ci; + Proto *p = ci_func(ci)->p; + ci->u.l.trap = 1; /* ensure hooks will be checked */ + if (ci->u.l.savedpc == p->code) { /* first instruction (not resuming)? */ + if (p->is_vararg) + return 0; /* hooks will start at VARARGPREP instruction */ + else if (!(ci->callstatus & CIST_HOOKYIELD)) /* not yieded? */ + luaD_hookcall(L, ci); /* check 'call' hook */ + } + return 1; /* keep 'trap' on */ +} + + +/* ** Traces the execution of a Lua function. Called before the execution ** of each opcode, when debug is on. 'L->oldpc' stores the last ** instruction traced, to detect line changes. When entering a new @@ -888,12 +936,12 @@ int luaG_traceexec (lua_State *L, const Instruction *pc) { } pc++; /* reference is always next instruction */ ci->u.l.savedpc = pc; /* save 'pc' */ - counthook = (--L->hookcount == 0 && (mask & LUA_MASKCOUNT)); + counthook = (mask & LUA_MASKCOUNT) && (--L->hookcount == 0); if (counthook) resethookcount(L); /* reset count */ else if (!(mask & LUA_MASKLINE)) return 1; /* no line hook and count != 0; nothing to be done now */ - if (ci->callstatus & CIST_HOOKYIELD) { /* called hook last time? */ + if (ci->callstatus & CIST_HOOKYIELD) { /* hook yielded last time? */ ci->callstatus &= ~CIST_HOOKYIELD; /* erase mark */ return 1; /* do not call hook again (VM yielded, so it did not move) */ } @@ -915,7 +963,6 @@ int luaG_traceexec (lua_State *L, const Instruction *pc) { if (L->status == LUA_YIELD) { /* did hook yield? */ if (counthook) L->hookcount = 1; /* undo decrement to zero */ - ci->u.l.savedpc--; /* undo increment (resume will increment it again) */ ci->callstatus |= CIST_HOOKYIELD; /* mark that it yielded */ luaD_throw(L, LUA_YIELD); } |