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Sweden-Number/dlls/vbscript/interp.c

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/*
* Copyright 2011 Jacek Caban for CodeWeavers
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include <assert.h>
#include "vbscript.h"
#include "wine/debug.h"
WINE_DEFAULT_DEBUG_CHANNEL(vbscript);
typedef struct {
vbscode_t *code;
instr_t *instr;
script_ctx_t *script;
function_t *func;
unsigned stack_size;
unsigned top;
VARIANT *stack;
} exec_ctx_t;
typedef HRESULT (*instr_func_t)(exec_ctx_t*);
typedef enum {
REF_NONE,
REF_DISP,
REF_VAR
} ref_type_t;
typedef struct {
ref_type_t type;
union {
struct {
IDispatch *disp;
DISPID id;
} d;
VARIANT *v;
} u;
} ref_t;
typedef struct {
VARIANT *v;
VARIANT store;
BOOL owned;
} variant_val_t;
static BOOL lookup_dynamic_vars(dynamic_var_t *var, const WCHAR *name, ref_t *ref)
{
while(var) {
if(!strcmpiW(var->name, name)) {
ref->type = REF_VAR;
ref->u.v = &var->v;
return TRUE;
}
var = var->next;
}
return FALSE;
}
static HRESULT lookup_identifier(exec_ctx_t *ctx, BSTR name, ref_t *ref)
{
named_item_t *item;
DISPID id;
HRESULT hres;
if(lookup_dynamic_vars(ctx->script->global_vars, name, ref))
return S_OK;
LIST_FOR_EACH_ENTRY(item, &ctx->script->named_items, named_item_t, entry) {
if(item->flags & SCRIPTITEM_GLOBALMEMBERS) {
hres = disp_get_id(item->disp, name, &id);
if(SUCCEEDED(hres)) {
ref->type = REF_DISP;
ref->u.d.disp = item->disp;
ref->u.d.id = id;
return S_OK;
}
}
}
if(!ctx->func->code_ctx->option_explicit)
FIXME("create an attempt to set\n");
ref->type = REF_NONE;
return S_OK;
}
static inline VARIANT *stack_pop(exec_ctx_t *ctx)
{
assert(ctx->top);
return ctx->stack + --ctx->top;
}
static HRESULT stack_push(exec_ctx_t *ctx, VARIANT *v)
{
if(ctx->stack_size == ctx->top) {
VARIANT *new_stack;
new_stack = heap_realloc(ctx->stack, ctx->stack_size*2);
if(!new_stack) {
VariantClear(v);
return E_OUTOFMEMORY;
}
ctx->stack = new_stack;
ctx->stack_size *= 2;
}
ctx->stack[ctx->top++] = *v;
return S_OK;
}
static void stack_popn(exec_ctx_t *ctx, unsigned n)
{
while(n--)
VariantClear(stack_pop(ctx));
}
static HRESULT stack_pop_val(exec_ctx_t *ctx, variant_val_t *v)
{
VARIANT *var;
var = stack_pop(ctx);
if(V_VT(var) == (VT_BYREF|VT_VARIANT)) {
v->owned = FALSE;
var = V_VARIANTREF(var);
}else {
v->owned = TRUE;
}
if(V_VT(var) == VT_DISPATCH) {
FIXME("got dispatch - get its default value\n");
return E_NOTIMPL;
}else {
v->v = var;
}
return S_OK;
}
static inline void release_val(variant_val_t *v)
{
if(v->owned)
VariantClear(v->v);
}
static HRESULT stack_pop_disp(exec_ctx_t *ctx, IDispatch **ret)
{
VARIANT *v = stack_pop(ctx);
if(V_VT(v) == VT_DISPATCH) {
*ret = V_DISPATCH(v);
return S_OK;
}
if(V_VT(v) != (VT_VARIANT|VT_BYREF)) {
FIXME("not supported type: %s\n", debugstr_variant(v));
VariantClear(v);
return E_FAIL;
}
v = V_BYREF(v);
if(V_VT(v) != VT_DISPATCH) {
FIXME("not disp %s\n", debugstr_variant(v));
return E_FAIL;
}
if(V_DISPATCH(v))
IDispatch_AddRef(V_DISPATCH(v));
*ret = V_DISPATCH(v);
return S_OK;
}
static inline void instr_jmp(exec_ctx_t *ctx, unsigned addr)
{
ctx->instr = ctx->code->instrs + addr;
}
static void vbstack_to_dp(exec_ctx_t *ctx, unsigned arg_cnt, DISPPARAMS *dp)
{
dp->cArgs = arg_cnt;
dp->rgdispidNamedArgs = NULL;
dp->cNamedArgs = 0;
if(arg_cnt) {
VARIANT tmp;
unsigned i;
assert(ctx->top >= arg_cnt);
for(i=1; i*2 <= arg_cnt; i++) {
tmp = ctx->stack[ctx->top-i];
ctx->stack[ctx->top-i] = ctx->stack[ctx->top-arg_cnt+i-1];
ctx->stack[ctx->top-arg_cnt+i-1] = tmp;
}
dp->rgvarg = ctx->stack + ctx->top-arg_cnt;
}else {
dp->rgvarg = NULL;
}
}
static HRESULT do_icall(exec_ctx_t *ctx, VARIANT *res)
{
BSTR identifier = ctx->instr->arg1.bstr;
const unsigned arg_cnt = ctx->instr->arg2.uint;
ref_t ref = {0};
DISPPARAMS dp;
HRESULT hres;
hres = lookup_identifier(ctx, identifier, &ref);
if(FAILED(hres))
return hres;
vbstack_to_dp(ctx, arg_cnt, &dp);
switch(ref.type) {
case REF_VAR:
if(!res) {
FIXME("REF_VAR no res\n");
return E_NOTIMPL;
}
if(arg_cnt) {
FIXME("arguments not implemented\n");
return E_NOTIMPL;
}
V_VT(res) = VT_BYREF|VT_VARIANT;
V_BYREF(res) = V_VT(ref.u.v) == (VT_VARIANT|VT_BYREF) ? V_VARIANTREF(ref.u.v) : ref.u.v;
break;
case REF_DISP:
hres = disp_call(ctx->script, ref.u.d.disp, ref.u.d.id, &dp, res);
if(FAILED(hres))
return hres;
break;
case REF_NONE:
FIXME("%s not found\n", debugstr_w(identifier));
return DISP_E_UNKNOWNNAME;
}
stack_popn(ctx, arg_cnt);
return S_OK;
}
static HRESULT interp_icall(exec_ctx_t *ctx)
{
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = do_icall(ctx, &v);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_icallv(exec_ctx_t *ctx)
{
TRACE("\n");
return do_icall(ctx, NULL);
}
static HRESULT assign_ident(exec_ctx_t *ctx, BSTR name, VARIANT *val, BOOL own_val)
{
ref_t ref;
HRESULT hres;
hres = lookup_identifier(ctx, name, &ref);
if(FAILED(hres))
return hres;
switch(ref.type) {
case REF_VAR: {
VARIANT *v = ref.u.v;
if(V_VT(v) == (VT_VARIANT|VT_BYREF))
v = V_VARIANTREF(v);
if(own_val) {
VariantClear(v);
*v = *val;
hres = S_OK;
}else {
hres = VariantCopy(v, val);
}
break;
}
case REF_DISP:
hres = disp_propput(ctx->script, ref.u.d.disp, ref.u.d.id, val);
if(own_val)
VariantClear(val);
break;
case REF_NONE:
FIXME("%s not found\n", debugstr_w(name));
if(own_val)
VariantClear(val);
return DISP_E_UNKNOWNNAME;
}
return hres;
}
static HRESULT interp_assign_ident(exec_ctx_t *ctx)
{
const BSTR arg = ctx->instr->arg1.bstr;
variant_val_t v;
HRESULT hres;
TRACE("%s\n", debugstr_w(arg));
hres = stack_pop_val(ctx, &v);
if(FAILED(hres))
return hres;
return assign_ident(ctx, arg, v.v, v.owned);
}
static HRESULT interp_assign_member(exec_ctx_t *ctx)
{
BSTR identifier = ctx->instr->arg1.bstr;
variant_val_t val;
IDispatch *obj;
DISPID id;
HRESULT hres;
TRACE("%s\n", debugstr_w(identifier));
hres = stack_pop_disp(ctx, &obj);
if(FAILED(hres))
return hres;
if(!obj) {
FIXME("NULL obj\n");
return E_FAIL;
}
hres = stack_pop_val(ctx, &val);
if(FAILED(hres)) {
IDispatch_Release(obj);
return hres;
}
hres = disp_get_id(obj, identifier, &id);
if(SUCCEEDED(hres))
hres = disp_propput(ctx->script, obj, id, val.v);
release_val(&val);
IDispatch_Release(obj);
return hres;
}
static HRESULT interp_jmp(exec_ctx_t *ctx)
{
const unsigned arg = ctx->instr->arg1.uint;
TRACE("%u\n", arg);
instr_jmp(ctx, arg);
return S_OK;
}
static HRESULT interp_jmp_false(exec_ctx_t *ctx)
{
const unsigned arg = ctx->instr->arg1.uint;
variant_val_t val;
HRESULT hres;
TRACE("%u\n", arg);
hres = stack_pop_val(ctx, &val);
if(V_VT(val.v) != VT_BOOL) {
FIXME("unsupported for %s\n", debugstr_variant(val.v));
release_val(&val);
return E_NOTIMPL;
}
if(V_BOOL(val.v))
ctx->instr++;
else
instr_jmp(ctx, ctx->instr->arg1.uint);
return S_OK;
}
static HRESULT interp_ret(exec_ctx_t *ctx)
{
TRACE("\n");
ctx->instr = NULL;
return S_OK;
}
static HRESULT interp_bool(exec_ctx_t *ctx)
{
const VARIANT_BOOL arg = ctx->instr->arg1.lng;
VARIANT v;
TRACE("%s\n", arg ? "true" : "false");
V_VT(&v) = VT_BOOL;
V_BOOL(&v) = arg;
return stack_push(ctx, &v);
}
static HRESULT interp_string(exec_ctx_t *ctx)
{
VARIANT v;
TRACE("\n");
V_VT(&v) = VT_BSTR;
V_BSTR(&v) = SysAllocString(ctx->instr->arg1.str);
if(!V_BSTR(&v))
return E_OUTOFMEMORY;
return stack_push(ctx, &v);
}
static HRESULT interp_long(exec_ctx_t *ctx)
{
const LONG arg = ctx->instr->arg1.lng;
VARIANT v;
TRACE("%d\n", arg);
V_VT(&v) = VT_I4;
V_I4(&v) = arg;
return stack_push(ctx, &v);
}
static HRESULT interp_short(exec_ctx_t *ctx)
{
const LONG arg = ctx->instr->arg1.lng;
VARIANT v;
TRACE("%d\n", arg);
V_VT(&v) = VT_I2;
V_I2(&v) = arg;
return stack_push(ctx, &v);
}
static HRESULT interp_double(exec_ctx_t *ctx)
{
const DOUBLE *arg = ctx->instr->arg1.dbl;
VARIANT v;
TRACE("%lf\n", *arg);
V_VT(&v) = VT_R8;
V_R8(&v) = *arg;
return stack_push(ctx, &v);
}
static HRESULT interp_empty(exec_ctx_t *ctx)
{
VARIANT v;
TRACE("\n");
V_VT(&v) = VT_EMPTY;
return stack_push(ctx, &v);
}
static HRESULT interp_null(exec_ctx_t *ctx)
{
VARIANT v;
TRACE("\n");
V_VT(&v) = VT_NULL;
return stack_push(ctx, &v);
}
static HRESULT interp_not(exec_ctx_t *ctx)
{
variant_val_t val;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &val);
if(FAILED(hres))
return hres;
hres = VarNot(val.v, &v);
release_val(&val);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT cmp_oper(exec_ctx_t *ctx)
{
variant_val_t l, r;
HRESULT hres;
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
if(V_VT(l.v) == VT_NULL || V_VT(r.v) == VT_NULL) {
FIXME("comparing nulls is not implemented\n");
hres = E_NOTIMPL;
}else {
hres = VarCmp(l.v, r.v, ctx->script->lcid, 0);
}
}
release_val(&r);
release_val(&l);
return hres;
}
static HRESULT interp_equal(exec_ctx_t *ctx)
{
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = cmp_oper(ctx);
if(FAILED(hres))
return hres;
V_VT(&v) = VT_BOOL;
V_BOOL(&v) = hres == VARCMP_EQ ? VARIANT_TRUE : VARIANT_FALSE;
return stack_push(ctx, &v);
}
static HRESULT interp_nequal(exec_ctx_t *ctx)
{
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = cmp_oper(ctx);
if(FAILED(hres))
return hres;
V_VT(&v) = VT_BOOL;
V_BOOL(&v) = hres != VARCMP_EQ ? VARIANT_TRUE : VARIANT_FALSE;
return stack_push(ctx, &v);
}
static HRESULT interp_concat(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarCat(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_add(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarAdd(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_sub(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarSub(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_mod(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarMod(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_idiv(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarIdiv(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_div(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarDiv(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_mul(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarMul(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_exp(exec_ctx_t *ctx)
{
variant_val_t r, l;
VARIANT v;
HRESULT hres;
TRACE("\n");
hres = stack_pop_val(ctx, &r);
if(FAILED(hres))
return hres;
hres = stack_pop_val(ctx, &l);
if(SUCCEEDED(hres)) {
hres = VarPow(l.v, r.v, &v);
release_val(&l);
}
release_val(&r);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static HRESULT interp_neg(exec_ctx_t *ctx)
{
variant_val_t val;
VARIANT v;
HRESULT hres;
hres = stack_pop_val(ctx, &val);
if(FAILED(hres))
return hres;
hres = VarNeg(val.v, &v);
release_val(&val);
if(FAILED(hres))
return hres;
return stack_push(ctx, &v);
}
static const instr_func_t op_funcs[] = {
#define X(x,n,a,b) interp_ ## x,
OP_LIST
#undef X
};
static const unsigned op_move[] = {
#define X(x,n,a,b) n,
OP_LIST
#undef X
};
HRESULT exec_script(script_ctx_t *ctx, function_t *func)
{
exec_ctx_t exec;
vbsop_t op;
HRESULT hres = S_OK;
exec.stack_size = 16;
exec.top = 0;
exec.stack = heap_alloc(exec.stack_size * sizeof(VARIANT));
if(!exec.stack)
return E_OUTOFMEMORY;
exec.code = func->code_ctx;
exec.instr = exec.code->instrs + func->code_off;
exec.script = ctx;
exec.func = func;
while(exec.instr) {
op = exec.instr->op;
hres = op_funcs[op](&exec);
if(FAILED(hres)) {
FIXME("Failed %08x\n", hres);
stack_popn(&exec, exec.top);
break;
}
exec.instr += op_move[op];
}
assert(!exec.top);
heap_free(exec.stack);
return hres;
}
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