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jscript: Added bytecode version of while statement.

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Jacek Caban 2011-12-27 11:16:02 +01:00 committed by Alexandre Julliard
parent a1a1cbcff0
commit f5425aeeca
2 changed files with 69 additions and 1 deletions
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68
dlls/jscript/compile.c
View file

@ -32,6 +32,8 @@ struct _compiler_ctx_t {
unsigned code_off;
unsigned code_size;
BOOL no_fallback;
};
static HRESULT compile_expression(compiler_ctx_t*,expression_t*);
@ -425,6 +427,9 @@ static HRESULT compile_interp_fallback(compiler_ctx_t *ctx, statement_t *stat)
{
unsigned instr;
if(ctx->no_fallback)
return E_NOTIMPL;
instr = push_instr(ctx, OP_tree);
if(instr == -1)
return E_OUTOFMEMORY;
@ -943,6 +948,67 @@ static HRESULT compile_if_statement(compiler_ctx_t *ctx, if_statement_t *stat)
return S_OK;
}
/* ECMA-262 3rd Edition 12.6.2 */
static HRESULT compile_while_statement(compiler_ctx_t *ctx, while_statement_t *stat)
{
unsigned off_backup, jmp_off, jmp = -1;
BOOL prev_no_fallback;
HRESULT hres;
off_backup = ctx->code_off;
if(!stat->do_while) {
/* FIXME: avoid */
if(push_instr(ctx, OP_undefined) == -1)
return E_OUTOFMEMORY;
jmp_off = ctx->code_off;
hres = compile_expression(ctx, stat->expr);
if(FAILED(hres))
return hres;
jmp = push_instr(ctx, OP_jmp_z);
if(jmp == -1)
return E_OUTOFMEMORY;
if(push_instr(ctx, OP_pop) == -1)
return E_OUTOFMEMORY;
}else {
jmp_off = ctx->code_off;
}
prev_no_fallback = ctx->no_fallback;
ctx->no_fallback = TRUE;
hres = compile_statement(ctx, stat->statement);
ctx->no_fallback = prev_no_fallback;
if(hres == E_NOTIMPL) {
ctx->code_off = off_backup;
stat->stat.eval = while_statement_eval;
return compile_interp_fallback(ctx, &stat->stat);
}
if(FAILED(hres))
return hres;
if(stat->do_while) {
hres = compile_expression(ctx, stat->expr);
if(FAILED(hres))
return hres;
jmp = push_instr(ctx, OP_jmp_z);
if(jmp == -1)
return E_OUTOFMEMORY;
if(push_instr(ctx, OP_pop) == -1)
return E_OUTOFMEMORY;
}
hres = push_instr_uint(ctx, OP_jmp, jmp_off);
if(FAILED(hres))
return hres;
instr_ptr(ctx, jmp)->arg1.uint = ctx->code_off;
return S_OK;
}
static HRESULT compile_statement(compiler_ctx_t *ctx, statement_t *stat)
{
switch(stat->type) {
@ -956,6 +1022,8 @@ static HRESULT compile_statement(compiler_ctx_t *ctx, statement_t *stat)
return compile_if_statement(ctx, (if_statement_t*)stat);
case STAT_VAR:
return compile_var_statement(ctx, (var_statement_t*)stat);
case STAT_WHILE:
return compile_while_statement(ctx, (while_statement_t*)stat);
default:
return compile_interp_fallback(ctx, stat);
}

2
dlls/jscript/parser.y
View file

@ -850,7 +850,7 @@ static const statement_eval_t stat_eval_table[] = {
throw_statement_eval,
try_statement_eval,
compiled_statement_eval,
while_statement_eval,
compiled_statement_eval,
with_statement_eval
};