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wasm loader: Fix handling if block without op else (#3404)

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If there is no else branch, make a virtual else opcode for easier integrity
check and to copy the correct results to the block return address for
fast-interp mode: change if block from `if ... end` to `if ... else end`.

Reported in issue #3386, #3387, #3388.
This commit is contained in:
Wenyong Huang
2024-05-09 16:46:26 +08:00
committed by GitHub
parent ea13d47a41
commit a6c0cb74c9
2 changed files with 27 additions and 66 deletions
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32
core/iwasm/interpreter/wasm_mini_loader.c
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@ -6213,6 +6213,7 @@ re_scan:
}
case WASM_OP_ELSE:
handle_op_else:
{
BranchBlock *block = NULL;
BlockType block_type = (loader_ctx->frame_csp - 1)->block_type;
@ -6272,26 +6273,21 @@ re_scan:
error_buf_size))
goto fail;
/* if no else branch, and return types do not match param types,
* fail */
/* if there is no else branch, make a virtual else opcode for
easier integrity check and to copy the correct results to
the block return address for fast-interp mode:
change if block from `if ... end` to `if ... else end` */
if (cur_block->label_type == LABEL_TYPE_IF
&& !cur_block->else_addr) {
uint32 block_param_count = 0, block_ret_count = 0;
uint8 *block_param_types = NULL, *block_ret_types = NULL;
BlockType *cur_block_type = &cur_block->block_type;
block_param_count = block_type_get_param_types(
cur_block_type, &block_param_types);
block_ret_count = block_type_get_result_types(
cur_block_type, &block_ret_types);
bh_assert(block_param_count == block_ret_count
&& (!block_param_count
|| !memcmp(block_param_types, block_ret_types,
block_param_count)));
(void)block_ret_types;
(void)block_ret_count;
(void)block_param_types;
(void)block_param_count;
opcode = WASM_OP_ELSE;
p--;
#if WASM_ENABLE_FAST_INTERP != 0
p_org = p;
skip_label();
disable_emit = false;
emit_label(opcode);
#endif
goto handle_op_else;
}
POP_CSP();