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256 lines
7.4 KiB
C
256 lines
7.4 KiB
C
/* Copyright 2014-2016 Samsung Electronics Co., Ltd.
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* Copyright 2015-2016 University of Szeged.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ecma-alloc.h"
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#include "ecma-gc.h"
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#include "ecma-helpers.h"
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#include "vm-defines.h"
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#include "vm-stack.h"
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/** \addtogroup vm Virtual machine
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* @{
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*
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* \addtogroup stack VM stack
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* @{
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*/
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/**
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* Abort (finalize) the current stack context, and remove it.
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*
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* @return new stack top
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*/
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ecma_value_t *
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vm_stack_context_abort (vm_frame_ctx_t *frame_ctx_p, /**< frame context */
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ecma_value_t *vm_stack_top_p) /**< current stack top */
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{
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switch (VM_GET_CONTEXT_TYPE (vm_stack_top_p[-1]))
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{
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case VM_CONTEXT_FINALLY_THROW:
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case VM_CONTEXT_FINALLY_RETURN:
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{
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ecma_free_value (vm_stack_top_p[-2]);
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VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
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vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
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break;
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}
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case VM_CONTEXT_FINALLY_JUMP:
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case VM_CONTEXT_TRY:
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{
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VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
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vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
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break;
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}
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case VM_CONTEXT_CATCH:
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case VM_CONTEXT_WITH:
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{
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ecma_deref_object (frame_ctx_p->lex_env_p);
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frame_ctx_p->lex_env_p = ecma_get_object_from_value (vm_stack_top_p[-2]);
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JERRY_ASSERT (PARSER_TRY_CONTEXT_STACK_ALLOCATION == PARSER_WITH_CONTEXT_STACK_ALLOCATION);
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VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
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vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
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break;
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}
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case VM_CONTEXT_FOR_IN:
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{
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jmem_cpointer_t current = (jmem_cpointer_t) vm_stack_top_p[-2];
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while (current != JMEM_CP_NULL)
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{
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ecma_collection_chunk_t *chunk_p = JMEM_CP_GET_NON_NULL_POINTER (ecma_collection_chunk_t,
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current);
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lit_utf8_byte_t *data_ptr = chunk_p->data;
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ecma_free_value (*(ecma_value_t *) data_ptr);
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current = chunk_p->next_chunk_cp;
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ecma_dealloc_collection_chunk (chunk_p);
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}
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ecma_free_value (vm_stack_top_p[-3]);
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VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_FOR_IN_CONTEXT_STACK_ALLOCATION);
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vm_stack_top_p -= PARSER_FOR_IN_CONTEXT_STACK_ALLOCATION;
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break;
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}
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default:
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{
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JERRY_UNREACHABLE ();
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break;
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}
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}
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return vm_stack_top_p;
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} /* vm_stack_context_abort */
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/**
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* Decode branch offset.
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*
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* @return branch offset
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*/
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static uint32_t
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vm_decode_branch_offset (uint8_t *branch_offset_p, /**< start offset of byte code */
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uint32_t length) /**< length of the branch */
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{
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uint32_t branch_offset = *branch_offset_p;
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JERRY_ASSERT (length >= 1 && length <= 3);
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switch (length)
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{
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case 3:
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{
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branch_offset <<= 8;
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branch_offset |= *(branch_offset_p++);
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/* FALLTHRU */
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}
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case 2:
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{
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branch_offset <<= 8;
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branch_offset |= *(branch_offset_p++);
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break;
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}
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}
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return branch_offset;
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} /* vm_decode_branch_offset */
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/**
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* Find a finally up to the end position.
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*
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* @return true if 'finally' found,
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* false otherwise
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*/
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bool
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vm_stack_find_finally (vm_frame_ctx_t *frame_ctx_p, /**< frame context */
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ecma_value_t **vm_stack_top_ref_p, /**< current stack top */
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vm_stack_context_type_t finally_type, /**< searching this finally */
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uint32_t search_limit) /**< search up-to this byte code */
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{
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ecma_value_t *vm_stack_top_p = *vm_stack_top_ref_p;
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JERRY_ASSERT (finally_type <= VM_CONTEXT_FINALLY_RETURN);
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if (finally_type != VM_CONTEXT_FINALLY_JUMP)
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{
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search_limit = 0xffffffffu;
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}
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while (frame_ctx_p->context_depth > 0)
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{
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vm_stack_context_type_t context_type;
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uint32_t context_end = VM_GET_CONTEXT_END (vm_stack_top_p[-1]);
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if (search_limit < context_end)
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{
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*vm_stack_top_ref_p = vm_stack_top_p;
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return false;
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}
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context_type = VM_GET_CONTEXT_TYPE (vm_stack_top_p[-1]);
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if (context_type == VM_CONTEXT_TRY || context_type == VM_CONTEXT_CATCH)
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{
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uint8_t *byte_code_p;
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uint32_t branch_offset_length;
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uint32_t branch_offset;
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if (search_limit == context_end)
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{
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*vm_stack_top_ref_p = vm_stack_top_p;
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return false;
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}
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byte_code_p = frame_ctx_p->byte_code_start_p + VM_GET_CONTEXT_END (vm_stack_top_p[-1]);
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if (context_type == VM_CONTEXT_TRY)
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{
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JERRY_ASSERT (byte_code_p[0] == CBC_EXT_OPCODE);
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if (byte_code_p[1] >= CBC_EXT_CATCH
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&& byte_code_p[1] <= CBC_EXT_CATCH_3)
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{
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branch_offset_length = CBC_BRANCH_OFFSET_LENGTH (byte_code_p[1]);
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branch_offset = vm_decode_branch_offset (byte_code_p + 2,
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branch_offset_length);
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if (finally_type == VM_CONTEXT_FINALLY_THROW)
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{
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branch_offset += (uint32_t) (byte_code_p - frame_ctx_p->byte_code_start_p);
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vm_stack_top_p[-1] = VM_CREATE_CONTEXT (VM_CONTEXT_CATCH, branch_offset);
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byte_code_p += 2 + branch_offset_length;
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frame_ctx_p->byte_code_p = byte_code_p;
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*vm_stack_top_ref_p = vm_stack_top_p;
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return true;
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}
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byte_code_p += branch_offset;
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if (*byte_code_p == CBC_CONTEXT_END)
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{
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VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
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vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
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continue;
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}
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}
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}
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else
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{
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ecma_deref_object (frame_ctx_p->lex_env_p);
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frame_ctx_p->lex_env_p = ecma_get_object_from_value (vm_stack_top_p[-2]);
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if (byte_code_p[0] == CBC_CONTEXT_END)
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{
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VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
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vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
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continue;
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}
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}
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JERRY_ASSERT (byte_code_p[0] == CBC_EXT_OPCODE);
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JERRY_ASSERT (byte_code_p[1] >= CBC_EXT_FINALLY
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&& byte_code_p[1] <= CBC_EXT_FINALLY_3);
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branch_offset_length = CBC_BRANCH_OFFSET_LENGTH (byte_code_p[1]);
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branch_offset = vm_decode_branch_offset (byte_code_p + 2,
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branch_offset_length);
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branch_offset += (uint32_t) (byte_code_p - frame_ctx_p->byte_code_start_p);
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vm_stack_top_p[-1] = VM_CREATE_CONTEXT ((uint32_t) finally_type, branch_offset);
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byte_code_p += 2 + branch_offset_length;
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frame_ctx_p->byte_code_p = byte_code_p;
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*vm_stack_top_ref_p = vm_stack_top_p;
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return true;
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}
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vm_stack_top_p = vm_stack_context_abort (frame_ctx_p, vm_stack_top_p);
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}
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*vm_stack_top_ref_p = vm_stack_top_p;
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return false;
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} /* vm_stack_find_finally */
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/**
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* @}
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* @}
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*/
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