Compact Byte Code parser and executor for Jerry.
JerryScript-DCO-1.0-Signed-off-by: László Langó llango.u-szeged@partner.samsung.com JerryScript-DCO-1.0-Signed-off-by: Tamas Gergely tgergely.u-szeged@partner.samsung.com JerryScript-DCO-1.0-Signed-off-by: Zsolt Borbély zsborbely.u-szeged@partner.samsung.com JerryScript-DCO-1.0-Signed-off-by: Roland Takacs rtakacs.u-szeged@partner.samsung.com JerryScript-DCO-1.0-Signed-off-by: István Kádár ikadar@inf.u-szeged.hu JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg
+195
-253
@@ -1,4 +1,5 @@
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/* Copyright 2015 Samsung Electronics Co., Ltd.
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/* 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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@@ -13,8 +14,10 @@
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* limitations under the License.
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*/
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#include "ecma-globals.h"
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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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@@ -25,287 +28,226 @@
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*/
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/**
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* Size of a stack frame's dynamic chunk
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*/
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#define VM_STACK_DYNAMIC_CHUNK_SIZE (mem_heap_recommend_allocation_size (sizeof (vm_stack_chunk_header_t) + \
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sizeof (ecma_value_t)))
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/**
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* Number of value slots in a stack frame's dynamic chunk
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*/
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#define VM_STACK_SLOTS_IN_DYNAMIC_CHUNK ((VM_STACK_DYNAMIC_CHUNK_SIZE - sizeof (vm_stack_chunk_header_t)) / \
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sizeof (ecma_value_t))
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/**
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* The top-most stack frame
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*/
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vm_stack_frame_t* vm_stack_top_frame_p;
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/**
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* Initialize stack
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*/
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void
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vm_stack_init (void)
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{
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vm_stack_top_frame_p = NULL;
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} /* vm_stack_init */
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/**
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* Finalize stack
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*/
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void
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vm_stack_finalize ()
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{
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JERRY_ASSERT (vm_stack_top_frame_p == NULL);
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} /* vm_stack_finalize */
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/**
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* Get stack's top frame
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* Abort (finalize) the current stack context, and remove it.
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*
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* @return pointer to the top frame descriptor
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* @return new stack top
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*/
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vm_stack_frame_t*
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vm_stack_get_top_frame (void)
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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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return vm_stack_top_frame_p;
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} /* vm_stack_get_top_frame */
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/**
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* Add the frame to stack
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*/
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void
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vm_stack_add_frame (vm_stack_frame_t *frame_p, /**< frame to initialize */
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ecma_value_t *regs_p, /**< array of register variables' values */
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uint32_t regs_num, /**< total number of register variables */
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uint32_t local_vars_regs_num, /**< number of register variables,
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* used for local variables */
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uint32_t arg_regs_num, /**< number of register variables,
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* used for arguments */
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ecma_collection_header_t *arguments_p) /**< collection of arguments
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* (for case, their values
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* are moved to registers) */
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{
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frame_p->prev_frame_p = vm_stack_top_frame_p;
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vm_stack_top_frame_p = frame_p;
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frame_p->top_chunk_p = NULL;
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frame_p->dynamically_allocated_value_slots_p = frame_p->inlined_values;
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frame_p->current_slot_index = 0;
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frame_p->regs_p = regs_p;
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frame_p->regs_number = regs_num;
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JERRY_ASSERT (regs_num >= VM_SPECIAL_REGS_NUMBER);
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for (uint32_t i = 0; i < regs_num - local_vars_regs_num - arg_regs_num; i++)
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switch (VM_GET_CONTEXT_TYPE (vm_stack_top_p[-1]))
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{
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regs_p[i] = ecma_make_simple_value (ECMA_SIMPLE_VALUE_EMPTY);
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}
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for (uint32_t i = regs_num - local_vars_regs_num - arg_regs_num;
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i < regs_num;
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i++)
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{
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regs_p[i] = ecma_make_simple_value (ECMA_SIMPLE_VALUE_UNDEFINED);
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}
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if (arg_regs_num != 0)
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{
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ecma_collection_iterator_t args_iterator;
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ecma_collection_iterator_init (&args_iterator, arguments_p);
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for (uint32_t i = regs_num - arg_regs_num;
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i < regs_num && ecma_collection_iterator_next (&args_iterator);
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i++)
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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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regs_p[i] = ecma_copy_value (*args_iterator.current_value_p, false);
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ecma_free_value (vm_stack_top_p[-2], true);
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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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mem_cpointer_t current = (uint16_t) vm_stack_top_p[-2];
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while (current != MEM_CP_NULL)
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{
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ecma_collection_chunk_t *chunk_p = MEM_CP_GET_NON_NULL_POINTER (ecma_collection_chunk_t,
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current);
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ecma_free_value (*(ecma_value_t *) chunk_p->data, true);
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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], true);
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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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} /* vm_stack_add_frame */
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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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* Free the stack frame
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* Decode branch offset.
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*
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* Note:
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* the frame should be the top-most frame
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* @return branch offset
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*/
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void
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vm_stack_free_frame (vm_stack_frame_t *frame_p) /**< frame to initialize */
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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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/* the frame should be the top-most frame */
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JERRY_ASSERT (vm_stack_top_frame_p == frame_p);
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uint32_t branch_offset = *branch_offset_p;
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vm_stack_top_frame_p = frame_p->prev_frame_p;
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JERRY_ASSERT (length >= 1 && length <= 3);
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while (frame_p->top_chunk_p != NULL)
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switch (length)
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{
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vm_stack_pop (frame_p);
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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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for (uint32_t reg_index = 0;
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reg_index < frame_p->regs_number;
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reg_index++)
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{
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ecma_free_value (frame_p->regs_p[reg_index], false);
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}
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} /* vm_stack_free_frame */
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return branch_offset;
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} /* vm_decode_branch_offset */
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/**
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* Get value of specified register variable
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* Find a finally up to the end position.
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*
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* @return ecma-value
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* @return true if 'finally' found,
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* false otherwise
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*/
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ecma_value_t
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vm_stack_frame_get_reg_value (vm_stack_frame_t *frame_p, /**< frame */
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uint32_t reg_index) /**< index of register variable */
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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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JERRY_ASSERT (reg_index >= VM_REG_FIRST && reg_index < VM_REG_FIRST + frame_p->regs_number);
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ecma_value_t *vm_stack_top_p = *vm_stack_top_ref_p;
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return frame_p->regs_p[reg_index - VM_REG_FIRST];
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} /* vm_stack_frame_get_reg_value */
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JERRY_ASSERT (finally_type <= VM_CONTEXT_FINALLY_RETURN);
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/**
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* Set value of specified register variable
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*/
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void
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vm_stack_frame_set_reg_value (vm_stack_frame_t *frame_p, /**< frame */
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uint32_t reg_index, /**< index of register variable */
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ecma_value_t value) /**< ecma-value */
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{
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JERRY_ASSERT (reg_index >= VM_REG_FIRST && reg_index < VM_REG_FIRST + frame_p->regs_number);
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frame_p->regs_p[reg_index - VM_REG_FIRST] = value;
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} /* vm_stack_frame_set_reg_value */
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/**
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* Calculate number of value slots in the top-most chunk of the frame
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*
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* @return number of value slots
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*/
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static size_t
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vm_stack_slots_in_top_chunk (vm_stack_frame_t *frame_p) /**< stack frame */
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{
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return ((frame_p->top_chunk_p == NULL) ? VM_STACK_FRAME_INLINED_VALUES_NUMBER : VM_STACK_SLOTS_IN_DYNAMIC_CHUNK);
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} /* vm_stack_slots_in_top_chunk */
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/**
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* Longpath for vm_stack_push_value (for case current chunk may be doesn't have free slots)
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*/
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static void __attr_noinline___
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vm_stack_push_value_longpath (vm_stack_frame_t *frame_p) /**< stack frame */
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{
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JERRY_ASSERT (frame_p->current_slot_index >= JERRY_MIN (VM_STACK_FRAME_INLINED_VALUES_NUMBER,
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VM_STACK_SLOTS_IN_DYNAMIC_CHUNK));
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const size_t slots_in_top_chunk = vm_stack_slots_in_top_chunk (frame_p);
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if (frame_p->current_slot_index == slots_in_top_chunk)
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if (finally_type != VM_CONTEXT_FINALLY_JUMP)
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{
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vm_stack_chunk_header_t *chunk_p;
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chunk_p = (vm_stack_chunk_header_t *) mem_heap_alloc_block (VM_STACK_DYNAMIC_CHUNK_SIZE,
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MEM_HEAP_ALLOC_SHORT_TERM);
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ECMA_SET_POINTER (chunk_p->prev_chunk_p, frame_p->top_chunk_p);
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frame_p->top_chunk_p = chunk_p;
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frame_p->dynamically_allocated_value_slots_p = (ecma_value_t*) (frame_p->top_chunk_p + 1);
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frame_p->current_slot_index = 0;
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}
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} /* vm_stack_push_value_longpath */
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/**
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* Push ecma-value to stack
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*/
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void
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vm_stack_push_value (vm_stack_frame_t *frame_p, /**< stack frame */
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ecma_value_t value) /**< ecma-value */
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{
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frame_p->current_slot_index++;
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if (frame_p->current_slot_index >= JERRY_MIN (VM_STACK_FRAME_INLINED_VALUES_NUMBER,
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VM_STACK_SLOTS_IN_DYNAMIC_CHUNK))
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{
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vm_stack_push_value_longpath (frame_p);
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search_limit = 0xffffffffu;
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}
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JERRY_ASSERT (frame_p->current_slot_index < vm_stack_slots_in_top_chunk (frame_p));
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frame_p->dynamically_allocated_value_slots_p[frame_p->current_slot_index] = value;
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} /* vm_stack_push_value */
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/**
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* Get top value from stack
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*/
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ecma_value_t __attr_always_inline___
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vm_stack_top_value (vm_stack_frame_t *frame_p) /**< stack frame */
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{
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const size_t slots_in_top_chunk = vm_stack_slots_in_top_chunk (frame_p);
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JERRY_ASSERT (frame_p->current_slot_index < slots_in_top_chunk);
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return frame_p->dynamically_allocated_value_slots_p[frame_p->current_slot_index];
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} /* vm_stack_top_value */
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/**
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* Longpath for vm_stack_pop (for case a dynamically allocated chunk needs to be deallocated)
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*/
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static void __attr_noinline___
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vm_stack_pop_longpath (vm_stack_frame_t *frame_p) /**< stack frame */
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{
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JERRY_ASSERT (frame_p->current_slot_index == 0 && frame_p->top_chunk_p != NULL);
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vm_stack_chunk_header_t *chunk_to_free_p = frame_p->top_chunk_p;
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frame_p->top_chunk_p = ECMA_GET_POINTER (vm_stack_chunk_header_t,
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frame_p->top_chunk_p->prev_chunk_p);
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if (frame_p->top_chunk_p != NULL)
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while (frame_ctx_p->context_depth > 0)
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{
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frame_p->dynamically_allocated_value_slots_p = (ecma_value_t*) (frame_p->top_chunk_p + 1);
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frame_p->current_slot_index = (uint32_t) (VM_STACK_SLOTS_IN_DYNAMIC_CHUNK - 1u);
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}
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else
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{
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frame_p->dynamically_allocated_value_slots_p = frame_p->inlined_values;
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frame_p->current_slot_index = (uint32_t) (VM_STACK_FRAME_INLINED_VALUES_NUMBER - 1u);
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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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||||
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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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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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||||
uint8_t *byte_code_p;
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||||
uint32_t branch_offset_length;
|
||||
uint32_t branch_offset;
|
||||
|
||||
if (search_limit == context_end)
|
||||
{
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*vm_stack_top_ref_p = vm_stack_top_p;
|
||||
return false;
|
||||
}
|
||||
|
||||
byte_code_p = frame_ctx_p->byte_code_start_p + VM_GET_CONTEXT_END (vm_stack_top_p[-1]);
|
||||
|
||||
if (context_type == VM_CONTEXT_TRY)
|
||||
{
|
||||
JERRY_ASSERT (byte_code_p[0] == CBC_EXT_OPCODE);
|
||||
|
||||
if (byte_code_p[1] >= CBC_EXT_CATCH
|
||||
&& byte_code_p[1] <= CBC_EXT_CATCH_3)
|
||||
{
|
||||
branch_offset_length = CBC_BRANCH_OFFSET_LENGTH (byte_code_p[1]);
|
||||
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)
|
||||
{
|
||||
branch_offset += (uint32_t) (byte_code_p - frame_ctx_p->byte_code_start_p);
|
||||
|
||||
vm_stack_top_p[-1] = VM_CREATE_CONTEXT (VM_CONTEXT_CATCH, branch_offset);
|
||||
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||||
byte_code_p += 2 + branch_offset_length;
|
||||
frame_ctx_p->byte_code_p = byte_code_p;
|
||||
|
||||
*vm_stack_top_ref_p = vm_stack_top_p;
|
||||
return true;
|
||||
}
|
||||
|
||||
byte_code_p += branch_offset;
|
||||
|
||||
if (*byte_code_p == CBC_CONTEXT_END)
|
||||
{
|
||||
VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
|
||||
vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
}
|
||||
else
|
||||
{
|
||||
ecma_deref_object (frame_ctx_p->lex_env_p);
|
||||
frame_ctx_p->lex_env_p = ecma_get_object_from_value (vm_stack_top_p[-2]);
|
||||
|
||||
if (byte_code_p[0] == CBC_CONTEXT_END)
|
||||
{
|
||||
VM_MINUS_EQUAL_U16 (frame_ctx_p->context_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
|
||||
vm_stack_top_p -= PARSER_TRY_CONTEXT_STACK_ALLOCATION;
|
||||
continue;
|
||||
}
|
||||
}
|
||||
|
||||
JERRY_ASSERT (byte_code_p[0] == CBC_EXT_OPCODE);
|
||||
JERRY_ASSERT (byte_code_p[1] >= CBC_EXT_FINALLY
|
||||
&& byte_code_p[1] <= CBC_EXT_FINALLY_3);
|
||||
|
||||
branch_offset_length = CBC_BRANCH_OFFSET_LENGTH (byte_code_p[1]);
|
||||
branch_offset = vm_decode_branch_offset (byte_code_p + 2,
|
||||
branch_offset_length);
|
||||
|
||||
branch_offset += (uint32_t) (byte_code_p - frame_ctx_p->byte_code_start_p);
|
||||
|
||||
vm_stack_top_p[-1] = VM_CREATE_CONTEXT ((uint32_t) finally_type, branch_offset);
|
||||
|
||||
byte_code_p += 2 + branch_offset_length;
|
||||
frame_ctx_p->byte_code_p = byte_code_p;
|
||||
|
||||
*vm_stack_top_ref_p = vm_stack_top_p;
|
||||
return true;
|
||||
}
|
||||
|
||||
vm_stack_top_p = vm_stack_context_abort (frame_ctx_p, vm_stack_top_p);
|
||||
}
|
||||
|
||||
mem_heap_free_block (chunk_to_free_p);
|
||||
} /* vm_stack_pop_longpath */
|
||||
|
||||
/**
|
||||
* Pop top value from stack and free it
|
||||
*/
|
||||
void
|
||||
vm_stack_pop (vm_stack_frame_t *frame_p) /**< stack frame */
|
||||
{
|
||||
JERRY_ASSERT (frame_p->current_slot_index < vm_stack_slots_in_top_chunk (frame_p));
|
||||
|
||||
ecma_value_t value = vm_stack_top_value (frame_p);
|
||||
|
||||
if (unlikely (frame_p->current_slot_index == 0
|
||||
&& frame_p->top_chunk_p != NULL))
|
||||
{
|
||||
vm_stack_pop_longpath (frame_p);
|
||||
}
|
||||
else
|
||||
{
|
||||
frame_p->current_slot_index--;
|
||||
}
|
||||
|
||||
ecma_free_value (value, true);
|
||||
} /* vm_stack_pop */
|
||||
|
||||
/**
|
||||
* Pop multiple top values from stack and free them
|
||||
*/
|
||||
void
|
||||
vm_stack_pop_multiple (vm_stack_frame_t *frame_p, /**< stack frame */
|
||||
uint32_t number) /**< number of elements to pop */
|
||||
{
|
||||
for (uint32_t i = 0; i < number; i++)
|
||||
{
|
||||
vm_stack_pop (frame_p);
|
||||
}
|
||||
} /* vm_stack_pop_multiple */
|
||||
*vm_stack_top_ref_p = vm_stack_top_p;
|
||||
return false;
|
||||
} /* vm_stack_find_finally */
|
||||
|
||||
/**
|
||||
* @}
|
||||
|
||||
Reference in New Issue
Block a user