dlls/vbscript/compile.c

   1 /*
   2  * Copyright 2011 Jacek Caban for CodeWeavers
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2.1 of the License, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * Lesser General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public
  15  * License along with this library; if not, write to the Free Software
  16  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  17  */
  18
  19 #include <assert.h>
  20
  21 #include "vbscript.h"
  22 #include "parse.h"
  23 #include "parser.tab.h"
  24
  25 #include "wine/debug.h"
  26
  27 WINE_DEFAULT_DEBUG_CHANNEL(vbscript);
  28
  29 typedef struct {
  30     parser_ctx_t parser;
  31
  32     unsigned instr_cnt;
  33     unsigned instr_size;
  34     vbscode_t *code;
  35 } compile_ctx_t;
  36
  37 static HRESULT compile_expression(compile_ctx_t*,expression_t*);
  38
  39 static inline instr_t *instr_ptr(compile_ctx_t *ctx, unsigned id)
  40 {
  41     assert(id < ctx->instr_cnt);
  42     return ctx->code->instrs + id;
  43 }
  44
  45 static unsigned push_instr(compile_ctx_t *ctx, vbsop_t op)
  46 {
  47     assert(ctx->instr_size && ctx->instr_size >= ctx->instr_cnt);
  48
  49     if(ctx->instr_size == ctx->instr_cnt) {
  50         instr_t *new_instr;
  51
  52         new_instr = heap_realloc(ctx->code->instrs, ctx->instr_size*2*sizeof(instr_t));
  53         if(!new_instr)
  54             return -1;
  55
  56         ctx->code->instrs = new_instr;
  57         ctx->instr_size *= 2;
  58     }
  59
  60     ctx->code->instrs[ctx->instr_cnt].op = op;
  61     return ctx->instr_cnt++;
  62 }
  63
  64 static HRESULT push_instr_int(compile_ctx_t *ctx, vbsop_t op, LONG arg)
  65 {
  66     unsigned ret;
  67
  68     ret = push_instr(ctx, op);
  69     if(ret == -1)
  70         return E_OUTOFMEMORY;
  71
  72     instr_ptr(ctx, ret)->arg1.lng = arg;
  73     return S_OK;
  74 }
  75
  76 static HRESULT push_instr_str(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg)
  77 {
  78     unsigned ret;
  79
  80     ret = push_instr(ctx, op);
  81     if(ret == -1)
  82         return E_OUTOFMEMORY;
  83
  84     instr_ptr(ctx, ret)->arg1.str = arg;
  85     return S_OK;
  86 }
  87
  88 static BSTR alloc_bstr_arg(compile_ctx_t *ctx, const WCHAR *str)
  89 {
  90     if(!ctx->code->bstr_pool_size) {
  91         ctx->code->bstr_pool = heap_alloc(8 * sizeof(BSTR));
  92         if(!ctx->code->bstr_pool)
  93             return NULL;
  94         ctx->code->bstr_pool_size = 8;
  95     }else if(ctx->code->bstr_pool_size == ctx->code->bstr_cnt) {
  96        BSTR *new_pool;
  97
  98         new_pool = heap_realloc(ctx->code->bstr_pool, ctx->code->bstr_pool_size*2*sizeof(BSTR));
  99         if(!new_pool)
 100             return NULL;
 101
 102         ctx->code->bstr_pool = new_pool;
 103         ctx->code->bstr_pool_size *= 2;
 104     }
 105
 106     ctx->code->bstr_pool[ctx->code->bstr_cnt] = SysAllocString(str);
 107     if(!ctx->code->bstr_pool[ctx->code->bstr_cnt])
 108         return NULL;
 109
 110     return ctx->code->bstr_pool[ctx->code->bstr_cnt++];
 111 }
 112
 113 static HRESULT push_instr_bstr_uint(compile_ctx_t *ctx, vbsop_t op, const WCHAR *arg1, unsigned arg2)
 114 {
 115     unsigned instr;
 116     BSTR bstr;
 117
 118     bstr = alloc_bstr_arg(ctx, arg1);
 119     if(!bstr)
 120         return E_OUTOFMEMORY;
 121
 122     instr = push_instr(ctx, op);
 123     if(instr == -1)
 124         return E_OUTOFMEMORY;
 125
 126     instr_ptr(ctx, instr)->arg1.bstr = bstr;
 127     instr_ptr(ctx, instr)->arg2.uint = arg2;
 128     return S_OK;
 129 }
 130
 131 static HRESULT compile_args(compile_ctx_t *ctx, expression_t *args, unsigned *ret)
 132 {
 133     unsigned arg_cnt = 0;
 134     HRESULT hres;
 135
 136     while(args) {
 137         hres = compile_expression(ctx, args);
 138         if(FAILED(hres))
 139             return hres;
 140
 141         arg_cnt++;
 142         args = args->next;
 143     }
 144
 145     *ret = arg_cnt;
 146     return S_OK;
 147 }
 148
 149 static HRESULT compile_member_expression(compile_ctx_t *ctx, member_expression_t *expr)
 150 {
 151     unsigned arg_cnt = 0;
 152     HRESULT hres;
 153
 154     hres = compile_args(ctx, expr->args, &arg_cnt);
 155     if(FAILED(hres))
 156         return hres;
 157
 158     if(expr->obj_expr) {
 159         FIXME("obj_expr not implemented\n");
 160         hres = E_NOTIMPL;
 161     }else {
 162         hres = push_instr_bstr_uint(ctx, OP_icallv, expr->identifier, arg_cnt);
 163     }
 164
 165     return hres;
 166 }
 167
 168 static HRESULT compile_unary_expression(compile_ctx_t *ctx, unary_expression_t *expr, vbsop_t op)
 169 {
 170     HRESULT hres;
 171
 172     hres = compile_expression(ctx, expr->subexpr);
 173     if(FAILED(hres))
 174         return hres;
 175
 176     return push_instr(ctx, op) == -1 ? E_OUTOFMEMORY : S_OK;
 177 }
 178
 179 static HRESULT compile_expression(compile_ctx_t *ctx, expression_t *expr)
 180 {
 181     switch(expr->type) {
 182     case EXPR_BOOL:
 183         return push_instr_int(ctx, OP_bool, ((bool_expression_t*)expr)->value);
 184     case EXPR_NOT:
 185         return compile_unary_expression(ctx, (unary_expression_t*)expr, OP_not);
 186     case EXPR_STRING:
 187         return push_instr_str(ctx, OP_string, ((string_expression_t*)expr)->value);
 188     default:
 189         FIXME("Unimplemented expression type %d\n", expr->type);
 190         return E_NOTIMPL;
 191     }
 192
 193     return S_OK;
 194 }
 195
 196 static HRESULT compile_statement(compile_ctx_t *ctx, statement_t *stat)
 197 {
 198     HRESULT hres;
 199
 200     while(stat) {
 201         switch(stat->type) {
 202         case STAT_CALL:
 203             hres = compile_member_expression(ctx, ((call_statement_t*)stat)->expr);
 204             break;
 205         default:
 206             FIXME("Unimplemented statement type %d\n", stat->type);
 207             hres = E_NOTIMPL;
 208         }
 209
 210         if(FAILED(hres))
 211             return hres;
 212         stat = stat->next;
 213     }
 214
 215     return S_OK;
 216 }
 217
 218 static HRESULT compile_func(compile_ctx_t *ctx, statement_t *stat, function_t *func)
 219 {
 220     HRESULT hres;
 221
 222     func->code_off = ctx->instr_cnt;
 223
 224     hres = compile_statement(ctx, stat);
 225     if(FAILED(hres))
 226         return hres;
 227
 228     if(push_instr(ctx, OP_ret) == -1)
 229         return E_OUTOFMEMORY;
 230
 231     return S_OK;
 232 }
 233
 234 void release_vbscode(vbscode_t *code)
 235 {
 236     unsigned i;
 237
 238     list_remove(&code->entry);
 239
 240     for(i=0; i < code->bstr_cnt; i++)
 241         SysFreeString(code->bstr_pool[i]);
 242
 243     heap_free(code->bstr_pool);
 244     heap_free(code->source);
 245     heap_free(code->instrs);
 246     heap_free(code);
 247 }
 248
 249 static vbscode_t *alloc_vbscode(compile_ctx_t *ctx, const WCHAR *source)
 250 {
 251     vbscode_t *ret;
 252
 253     ret = heap_alloc(sizeof(*ret));
 254     if(!ret)
 255         return NULL;
 256
 257     ret->source = heap_strdupW(source);
 258     if(!ret->source) {
 259         heap_free(ret);
 260         return NULL;
 261     }
 262
 263     ret->instrs = heap_alloc(32*sizeof(instr_t));
 264     if(!ret->instrs) {
 265         release_vbscode(ret);
 266         return NULL;
 267     }
 268
 269     ctx->instr_cnt = 0;
 270     ctx->instr_size = 32;
 271
 272     ret->option_explicit = ctx->parser.option_explicit;
 273
 274     ret->bstr_pool = NULL;
 275     ret->bstr_pool_size = 0;
 276     ret->bstr_cnt = 0;
 277
 278     ret->global_code.code_ctx = ret;
 279
 280     list_init(&ret->entry);
 281     return ret;
 282 }
 283
 284 HRESULT compile_script(script_ctx_t *script, const WCHAR *src, vbscode_t **ret)
 285 {
 286     compile_ctx_t ctx;
 287     HRESULT hres;
 288
 289     hres = parse_script(&ctx.parser, src);
 290     if(FAILED(hres))
 291         return hres;
 292
 293     ctx.code = alloc_vbscode(&ctx, src);
 294     if(!ctx.code)
 295         return E_OUTOFMEMORY;
 296
 297     hres = compile_func(&ctx, ctx.parser.stats, &ctx.code->global_code);
 298     if(FAILED(hres)) {
 299         release_vbscode(ctx.code);
 300         return hres;
 301     }
 302
 303     list_add_tail(&script->code_list, &ctx.code->entry);
 304     *ret = ctx.code;
 305     return S_OK;
 306 }