christoph/wamr
1
Fork 0
Code Releases Activity

Update global initialization process for latest spec cases (#553)

Browse Source
This commit is contained in:
Wenyong Huang
2021-03-02 04:24:15 -06:00
committed by GitHub
parent 686733170c
commit fe76ce3b68
8 changed files with 240 additions and 148 deletions
Download Patch File Download Diff File Expand all files Collapse all files

173
core/iwasm/interpreter/wasm_runtime.c
View File

@ -23,6 +23,22 @@ set_error_buf(char *error_buf, uint32 error_buf_size, const char *string)
}
}
static void
set_error_buf_v(char *error_buf, uint32 error_buf_size,
const char *format, ...)
{
va_list args;
char buf[128];
if (error_buf != NULL) {
va_start(args, format);
vsnprintf(buf, sizeof(buf), format, args);
va_end(args);
snprintf(error_buf, error_buf_size,
"WASM module instantiate failed: %s", buf);
}
}
WASMModule*
wasm_load(const uint8 *buf, uint32 size,
char *error_buf, uint32 error_buf_size)
@ -635,40 +651,30 @@ globals_deinstantiate(WASMGlobalInstance *globals)
wasm_runtime_free(globals);
}
/**
* init_expr->u ==> init_val
*/
static bool
parse_init_expr(const InitializerExpression *init_expr,
const WASMGlobalInstance *global_inst_array,
uint32 boundary, WASMValue *init_val)
check_global_init_expr(const WASMModule *module, uint32 global_index,
char *error_buf, uint32 error_buf_size)
{
if (init_expr->init_expr_type == INIT_EXPR_TYPE_GET_GLOBAL) {
uint32 target_global_index = init_expr->u.global_index;
/**
* a global gets the init value of another global
*/
if (target_global_index >= boundary) {
LOG_DEBUG("unknown target global, %d", target_global_index);
return false;
}
if (global_index >= module->import_global_count + module->global_count) {
set_error_buf_v(error_buf, error_buf_size,
"unknown global %d", global_index);
return false;
}
/**
* it will work if using WASMGlobalImport and WASMGlobal in
* WASMModule, but will have to face complicated cases
*
* but we still have no sure the target global has been
* initialized before
*/
WASMValue target_value =
global_inst_array[target_global_index].initial_value;
bh_memcpy_s(init_val, sizeof(WASMValue), &target_value,
sizeof(target_value));
}
else {
bh_memcpy_s(init_val, sizeof(WASMValue), &init_expr->u,
sizeof(init_expr->u));
/**
* Currently, constant expressions occurring as initializers of
* globals are further constrained in that contained global.get
* instructions are only allowed to refer to imported globals.
*
* And initializer expression cannot reference a mutable global.
*/
if (global_index >= module->import_global_count
|| (module->import_globals + global_index)->u.global.is_mutable) {
set_error_buf(error_buf, error_buf_size,
"constant expression required");
return false;
}
return true;
}
@ -714,26 +720,19 @@ globals_instantiate(const WASMModule *module,
return NULL;
}
/**
* although, actually don't need initial_value for an imported
* global, we keep it here like a place holder because of
* global-data and
* (global $g2 i32 (global.get $g1))
*/
if (!parse_init_expr(
&(global_import->import_global_linked->init_expr),
global->import_module_inst->globals,
global->import_module_inst->global_count,
&(global->initial_value))) {
set_error_buf(error_buf, error_buf_size, "unknown global");
return NULL;
}
/* The linked global instance has been initialized, we
just need to copy the value. */
bh_memcpy_s(&(global->initial_value), sizeof(WASMValue),
&(global_import->import_global_linked->init_expr),
sizeof(WASMValue));
}
else
#endif
{
/* native globals share their initial_values in one module */
global->initial_value = global_import->global_data_linked;
bh_memcpy_s(&(global->initial_value), sizeof(WASMValue),
&(global_import->global_data_linked),
sizeof(WASMValue));
}
global->data_offset = global_data_offset;
global_data_offset += wasm_value_type_size(global->type);
@ -743,9 +742,6 @@ globals_instantiate(const WASMModule *module,
/* instantiate globals from global section */
for (i = 0; i < module->global_count; i++) {
bool ret = false;
uint32 global_count =
module->import_global_count + module->global_count;
InitializerExpression *init_expr = &(module->globals[i].init_expr);
global->type = module->globals[i].type;
@ -754,18 +750,20 @@ globals_instantiate(const WASMModule *module,
global_data_offset += wasm_value_type_size(global->type);
/**
* first init, it might happen that the target global instance
* has not been initialize yet
*/
if (init_expr->init_expr_type != INIT_EXPR_TYPE_GET_GLOBAL) {
ret =
parse_init_expr(init_expr, globals, global_count,
&(global->initial_value));
if (!ret) {
set_error_buf(error_buf, error_buf_size, "unknown global");
if (init_expr->init_expr_type == INIT_EXPR_TYPE_GET_GLOBAL) {
if (!check_global_init_expr(module, init_expr->u.global_index,
error_buf, error_buf_size)) {
return NULL;
}
bh_memcpy_s(
&(global->initial_value), sizeof(WASMValue),
&(globals[init_expr->u.global_index].initial_value),
sizeof(globals[init_expr->u.global_index].initial_value));
}
else {
bh_memcpy_s(&(global->initial_value), sizeof(WASMValue),
&(init_expr->u), sizeof(init_expr->u));
}
global++;
}
@ -776,39 +774,6 @@ globals_instantiate(const WASMModule *module,
return globals;
}
static bool
globals_instantiate_fix(WASMGlobalInstance *globals,
const WASMModule *module,
char *error_buf, uint32 error_buf_size)
{
WASMGlobalInstance *global = globals;
uint32 i;
uint32 global_count = module->import_global_count + module->global_count;
/**
* second init, only target global instances from global
* (ignore import_global)
* to fix skipped init_value in the previous round
* hope two rounds are enough but how about a chain ?
*/
for (i = 0; i < module->global_count; i++) {
bool ret = false;
InitializerExpression *init_expr = &module->globals[i].init_expr;
if (init_expr->init_expr_type == INIT_EXPR_TYPE_GET_GLOBAL) {
ret = parse_init_expr(init_expr, globals, global_count,
&global->initial_value);
if (!ret) {
set_error_buf(error_buf, error_buf_size, "unknown global");
return false;
}
}
global++;
}
return true;
}
/**
* Return export function count in module export section.
*/
@ -1240,15 +1205,6 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst,
}
if (global_count > 0) {
/**
* since there might be some globals are not instantiate the first
* instantiate round
*/
if (!globals_instantiate_fix(globals, module,
error_buf, error_buf_size)) {
goto fail;
}
/* Initialize the global data */
global_data = module_inst->global_data;
global_data_end = global_data + global_data_size;
@ -1307,14 +1263,20 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst,
if (data_seg->base_offset.init_expr_type
== INIT_EXPR_TYPE_GET_GLOBAL) {
if (!check_global_init_expr(module,
data_seg->base_offset.u.global_index,
error_buf, error_buf_size)) {
goto fail;
}
if (!globals
|| data_seg->base_offset.u.global_index >= global_count
|| globals[data_seg->base_offset.u.global_index].type
!= VALUE_TYPE_I32) {
!= VALUE_TYPE_I32) {
set_error_buf(error_buf, error_buf_size,
"data segment does not fit");
goto fail;
}
data_seg->base_offset.u.i32 =
globals[data_seg->base_offset.u.global_index]
.initial_value.i32;
@ -1371,8 +1333,13 @@ wasm_instantiate(WASMModule *module, bool is_sub_inst,
if (table_seg->base_offset.init_expr_type
== INIT_EXPR_TYPE_GET_GLOBAL) {
if (!check_global_init_expr(module,
table_seg->base_offset.u.global_index,
error_buf, error_buf_size)) {
goto fail;
}
if (!globals
|| table_seg->base_offset.u.global_index >= global_count
|| globals[table_seg->base_offset.u.global_index].type
!= VALUE_TYPE_I32) {
set_error_buf(error_buf, error_buf_size,