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Drop support for "use strip"
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Ref: #20
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@saghul
saghul authored Nov 6, 2023
1 parent 1fb9a50 commit e2ae874
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Showing 5 changed files with 62 additions and 115 deletions.
6 changes: 0 additions & 6 deletions doc/quickjs.texi
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Original file line number Diff line number Diff line change
Expand Up @@ -286,8 +286,6 @@ ECMA402 (Internationalization API) is not supported.

@itemize

@item The directive @code{"use strip"} indicates that the debug information (including the source code of the functions) should not be retained to save memory. As @code{"use strict"}, the directive can be global to a script or local to a function.

@item The first line of a script beginning with @code{#!} is ignored.

@end itemize
Expand All @@ -305,10 +303,6 @@ standard Javascript. See @code{jsbignum.pdf} for more information.

@item Operator overloading.

@item The directive @code{"use bigint"} enables the bigint mode where integers are @code{BigInt} by default.

@item The directive @code{"use math"} enables the math mode where the division and power operators on integers produce fractions. Floating point literals are @code{BigFloat} by default and integers are @code{BigInt} by default.

@end itemize

@section Modules
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164 changes: 60 additions & 104 deletions quickjs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -313,7 +313,6 @@ struct JSClass {
};

#define JS_MODE_STRICT (1 << 0)
#define JS_MODE_STRIP (1 << 1)

typedef struct JSStackFrame {
struct JSStackFrame *prev_frame; /* NULL if first stack frame */
Expand Down Expand Up @@ -22961,14 +22960,11 @@ static __exception int js_parse_class(JSParseState *s, BOOL is_class_expr,
put_u32(fd->byte_code.buf + ctor_cpool_offset, ctor_fd->parent_cpool_idx);

/* store the class source code in the constructor. */
if (!(fd->js_mode & JS_MODE_STRIP)) {
js_free(ctx, ctor_fd->source);
ctor_fd->source_len = s->buf_ptr - class_start_ptr;
ctor_fd->source = js_strndup(ctx, (const char *)class_start_ptr,
ctor_fd->source_len);
if (!ctor_fd->source)
goto fail;
}
js_free(ctx, ctor_fd->source);
ctor_fd->source_len = s->buf_ptr - class_start_ptr;
ctor_fd->source = js_strndup(ctx, (const char *)class_start_ptr, ctor_fd->source_len);
if (!ctor_fd->source)
goto fail;

/* consume the '}' */
if (next_token(s))
Expand Down Expand Up @@ -30871,7 +30867,7 @@ static void add_pc2line_info(JSFunctionDef *s, uint32_t pc, int line_num)

static void compute_pc2line_info(JSFunctionDef *s)
{
if (!(s->js_mode & JS_MODE_STRIP) && s->line_number_slots) {
if (s->line_number_slots) {
int last_line_num = s->line_num;
uint32_t last_pc = 0;
int i;
Expand Down Expand Up @@ -31098,7 +31094,7 @@ static __exception int resolve_labels(JSContext *ctx, JSFunctionDef *s)
}
#endif
/* XXX: Should skip this phase if not generating SHORT_OPCODES */
if (s->line_number_size && !(s->js_mode & JS_MODE_STRIP)) {
if (s->line_number_size) {
s->line_number_slots = js_mallocz(s->ctx, sizeof(*s->line_number_slots) * s->line_number_size);
if (s->line_number_slots == NULL)
return -1;
Expand Down Expand Up @@ -32243,30 +32239,26 @@ static JSValue js_create_function(JSContext *ctx, JSFunctionDef *fd)
}

#if defined(DUMP_BYTECODE) && (DUMP_BYTECODE & 4)
if (!(fd->js_mode & JS_MODE_STRIP)) {
printf("pass 1\n");
dump_byte_code(ctx, 1, fd->byte_code.buf, fd->byte_code.size,
fd->args, fd->arg_count, fd->vars, fd->var_count,
fd->closure_var, fd->closure_var_count,
fd->cpool, fd->cpool_count, fd->source, fd->line_num,
fd->label_slots, NULL);
printf("\n");
}
printf("pass 1\n");
dump_byte_code(ctx, 1, fd->byte_code.buf, fd->byte_code.size,
fd->args, fd->arg_count, fd->vars, fd->var_count,
fd->closure_var, fd->closure_var_count,
fd->cpool, fd->cpool_count, fd->source, fd->line_num,
fd->label_slots, NULL);
printf("\n");
#endif

if (resolve_variables(ctx, fd))
goto fail;

#if defined(DUMP_BYTECODE) && (DUMP_BYTECODE & 2)
if (!(fd->js_mode & JS_MODE_STRIP)) {
printf("pass 2\n");
dump_byte_code(ctx, 2, fd->byte_code.buf, fd->byte_code.size,
fd->args, fd->arg_count, fd->vars, fd->var_count,
fd->closure_var, fd->closure_var_count,
fd->cpool, fd->cpool_count, fd->source, fd->line_num,
fd->label_slots, NULL);
printf("\n");
}
printf("pass 2\n");
dump_byte_code(ctx, 2, fd->byte_code.buf, fd->byte_code.size,
fd->args, fd->arg_count, fd->vars, fd->var_count,
fd->closure_var, fd->closure_var_count,
fd->cpool, fd->cpool_count, fd->source, fd->line_num,
fd->label_slots, NULL);
printf("\n");
#endif

if (resolve_labels(ctx, fd))
Expand All @@ -32275,17 +32267,11 @@ static JSValue js_create_function(JSContext *ctx, JSFunctionDef *fd)
if (compute_stack_size(ctx, fd, &stack_size) < 0)
goto fail;

if (fd->js_mode & JS_MODE_STRIP) {
function_size = offsetof(JSFunctionBytecode, debug);
} else {
function_size = sizeof(*b);
}
function_size = sizeof(*b);
cpool_offset = function_size;
function_size += fd->cpool_count * sizeof(*fd->cpool);
vardefs_offset = function_size;
if (!(fd->js_mode & JS_MODE_STRIP) || fd->has_eval_call) {
function_size += (fd->arg_count + fd->var_count) * sizeof(*b->vardefs);
}
function_size += (fd->arg_count + fd->var_count) * sizeof(*b->vardefs);
closure_var_offset = function_size;
function_size += fd->closure_var_count * sizeof(*fd->closure_var);
byte_code_offset = function_size;
Expand All @@ -32304,26 +32290,11 @@ static JSValue js_create_function(JSContext *ctx, JSFunctionDef *fd)

b->func_name = fd->func_name;
if (fd->arg_count + fd->var_count > 0) {
if ((fd->js_mode & JS_MODE_STRIP) && !fd->has_eval_call) {
/* Strip variable definitions not needed at runtime */
int i;
for(i = 0; i < fd->var_count; i++) {
JS_FreeAtom(ctx, fd->vars[i].var_name);
}
for(i = 0; i < fd->arg_count; i++) {
JS_FreeAtom(ctx, fd->args[i].var_name);
}
for(i = 0; i < fd->closure_var_count; i++) {
JS_FreeAtom(ctx, fd->closure_var[i].var_name);
fd->closure_var[i].var_name = JS_ATOM_NULL;
}
} else {
b->vardefs = (void *)((uint8_t*)b + vardefs_offset);
if (fd->arg_count > 0)
memcpy(b->vardefs, fd->args, fd->arg_count * sizeof(fd->args[0]));
if (fd->var_count > 0)
memcpy(b->vardefs + fd->arg_count, fd->vars, fd->var_count * sizeof(fd->vars[0]));
}
b->vardefs = (void *)((uint8_t*)b + vardefs_offset);
if (fd->arg_count > 0)
memcpy(b->vardefs, fd->args, fd->arg_count * sizeof(fd->args[0]));
if (fd->var_count > 0)
memcpy(b->vardefs + fd->arg_count, fd->vars, fd->var_count * sizeof(fd->vars[0]));
b->var_count = fd->var_count;
b->arg_count = fd->arg_count;
b->defined_arg_count = fd->defined_arg_count;
Expand All @@ -32340,27 +32311,23 @@ static JSValue js_create_function(JSContext *ctx, JSFunctionDef *fd)

b->stack_size = stack_size;

if (fd->js_mode & JS_MODE_STRIP) {
JS_FreeAtom(ctx, fd->filename);
dbuf_free(&fd->pc2line); // probably useless
} else {
/* XXX: source and pc2line info should be packed at the end of the
JSFunctionBytecode structure, avoiding allocation overhead
*/
b->has_debug = 1;
b->debug.filename = fd->filename;
b->debug.line_num = fd->line_num;

//DynBuf pc2line;
//compute_pc2line_info(fd, &pc2line);
//js_free(ctx, fd->line_number_slots)
b->debug.pc2line_buf = js_realloc(ctx, fd->pc2line.buf, fd->pc2line.size);
if (!b->debug.pc2line_buf)
b->debug.pc2line_buf = fd->pc2line.buf;
b->debug.pc2line_len = fd->pc2line.size;
b->debug.source = fd->source;
b->debug.source_len = fd->source_len;
}
/* XXX: source and pc2line info should be packed at the end of the
JSFunctionBytecode structure, avoiding allocation overhead
*/
b->has_debug = 1;
b->debug.filename = fd->filename;
b->debug.line_num = fd->line_num;

//DynBuf pc2line;
//compute_pc2line_info(fd, &pc2line);
//js_free(ctx, fd->line_number_slots)
b->debug.pc2line_buf = js_realloc(ctx, fd->pc2line.buf, fd->pc2line.size);
if (!b->debug.pc2line_buf)
b->debug.pc2line_buf = fd->pc2line.buf;
b->debug.pc2line_len = fd->pc2line.size;
b->debug.source = fd->source;
b->debug.source_len = fd->source_len;

if (fd->scopes != fd->def_scope_array)
js_free(ctx, fd->scopes);

Expand Down Expand Up @@ -32389,9 +32356,7 @@ static JSValue js_create_function(JSContext *ctx, JSFunctionDef *fd)
add_gc_object(ctx->rt, &b->header, JS_GC_OBJ_TYPE_FUNCTION_BYTECODE);

#if defined(DUMP_BYTECODE) && (DUMP_BYTECODE & 1)
if (!(fd->js_mode & JS_MODE_STRIP)) {
js_dump_function_bytecode(ctx, b);
}
js_dump_function_bytecode(ctx, b);
#endif

if (fd->parent) {
Expand Down Expand Up @@ -32531,11 +32496,6 @@ static __exception int js_parse_directives(JSParseState *s)
s->cur_func->has_use_strict = TRUE;
s->cur_func->js_mode |= JS_MODE_STRICT;
}
#if !defined(DUMP_BYTECODE) || !(DUMP_BYTECODE & 8)
else if (!strcmp(str, "use strip")) {
s->cur_func->js_mode |= JS_MODE_STRIP;
}
#endif
}
return js_parse_seek_token(s, &pos);
}
Expand Down Expand Up @@ -33009,15 +32969,14 @@ static __exception int js_parse_function_decl2(JSParseState *s,
else
emit_op(s, OP_return);

if (!(fd->js_mode & JS_MODE_STRIP)) {
/* save the function source code */
/* the end of the function source code is after the last
token of the function source stored into s->last_ptr */
fd->source_len = s->last_ptr - ptr;
fd->source = js_strndup(ctx, (const char *)ptr, fd->source_len);
if (!fd->source)
goto fail;
}
/* save the function source code */
/* the end of the function source code is after the last
token of the function source stored into s->last_ptr */
fd->source_len = s->last_ptr - ptr;
fd->source = js_strndup(ctx, (const char *)ptr, fd->source_len);
if (!fd->source)
goto fail;

goto done;
}
}
Expand All @@ -33036,13 +32995,12 @@ static __exception int js_parse_function_decl2(JSParseState *s,
if (js_parse_source_element(s))
goto fail;
}
if (!(fd->js_mode & JS_MODE_STRIP)) {
/* save the function source code */
fd->source_len = s->buf_ptr - ptr;
fd->source = js_strndup(ctx, (const char *)ptr, fd->source_len);
if (!fd->source)
goto fail;
}

/* save the function source code */
fd->source_len = s->buf_ptr - ptr;
fd->source = js_strndup(ctx, (const char *)ptr, fd->source_len);
if (!fd->source)
goto fail;

if (next_token(s)) {
/* consume the '}' */
Expand Down Expand Up @@ -33331,8 +33289,6 @@ static JSValue __JS_EvalInternal(JSContext *ctx, JSValueConst this_obj,
js_mode = 0;
if (flags & JS_EVAL_FLAG_STRICT)
js_mode |= JS_MODE_STRICT;
if (flags & JS_EVAL_FLAG_STRIP)
js_mode |= JS_MODE_STRIP;
if (eval_type == JS_EVAL_TYPE_MODULE) {
JSAtom module_name = JS_NewAtom(ctx, filename);
if (module_name == JS_ATOM_NULL)
Expand Down
2 changes: 1 addition & 1 deletion quickjs.h
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Original file line number Diff line number Diff line change
Expand Up @@ -300,7 +300,7 @@ static inline JS_BOOL JS_VALUE_IS_NAN(JSValue v)
#define JS_EVAL_TYPE_MASK (3 << 0)

#define JS_EVAL_FLAG_STRICT (1 << 3) /* force 'strict' mode */
#define JS_EVAL_FLAG_STRIP (1 << 4) /* force 'strip' mode */
#define JS_EVAL_FLAG_UNUSED (1 << 4) /* unused */
/* compile but do not run. The result is an object with a
JS_TAG_FUNCTION_BYTECODE or JS_TAG_MODULE tag. It can be executed
with JS_EvalFunction(). */
Expand Down
2 changes: 0 additions & 2 deletions repl.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,8 +22,6 @@
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
"use strip";

import * as std from "std";
import * as os from "os";

Expand Down
3 changes: 1 addition & 2 deletions run-test262.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1550,8 +1550,7 @@ int run_test_buf(const char *filename, char *harness, namelist_t *ip,
add_helpers(ctx);

for (i = 0; i < ip->count; i++) {
if (eval_file(ctx, harness, ip->array[i],
JS_EVAL_TYPE_GLOBAL | JS_EVAL_FLAG_STRIP)) {
if (eval_file(ctx, harness, ip->array[i], JS_EVAL_TYPE_GLOBAL)) {
fatal(1, "error including %s for %s", ip->array[i], filename);
}
}
Expand Down

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