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js-parser.c
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/* Copyright JS Foundation and other contributors, http://js.foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "ecma-exceptions.h"
#include "ecma-extended-info.h"
#include "ecma-helpers.h"
#include "ecma-literal-storage.h"
#include "ecma-module.h"
#include "debugger.h"
#include "jcontext.h"
#include "js-parser-internal.h"
#include "lit-char-helpers.h"
/** \addtogroup parser Parser
* @{
*
* \addtogroup jsparser JavaScript
* @{
*
* \addtogroup jsparser_parser Parser
* @{
*/
#if JERRY_PARSER
JERRY_STATIC_ASSERT ((int) ECMA_PARSE_STRICT_MODE == (int) PARSER_IS_STRICT,
ecma_parse_strict_mode_must_be_equal_to_parser_is_strict);
JERRY_STATIC_ASSERT (PARSER_SAVE_STATUS_FLAGS (PARSER_ALLOW_SUPER) == 0x1, incorrect_saving_of_ecma_parse_allow_super);
JERRY_STATIC_ASSERT (PARSER_RESTORE_STATUS_FLAGS (ECMA_PARSE_ALLOW_SUPER) == PARSER_ALLOW_SUPER,
incorrect_restoring_of_ecma_parse_allow_super);
JERRY_STATIC_ASSERT (PARSER_RESTORE_STATUS_FLAGS (ECMA_PARSE_FUNCTION_CONTEXT) == 0,
ecma_parse_function_context_must_not_be_transformed);
/**
* Compute real literal indicies.
*
* @return length of the prefix opcodes
*/
static void
parser_compute_indicies (parser_context_t *context_p, /**< context */
uint16_t *ident_end, /**< end of the identifier group */
uint16_t *const_literal_end) /**< end of the const literal group */
{
parser_list_iterator_t literal_iterator;
lexer_literal_t *literal_p;
uint16_t ident_count = 0;
uint16_t const_literal_count = 0;
uint16_t ident_index;
uint16_t const_literal_index;
uint16_t literal_index;
/* First phase: count the number of items in each group. */
parser_list_iterator_init (&context_p->literal_pool, &literal_iterator);
while ((literal_p = (lexer_literal_t *) parser_list_iterator_next (&literal_iterator)))
{
switch (literal_p->type)
{
case LEXER_IDENT_LITERAL:
{
if (literal_p->status_flags & LEXER_FLAG_USED)
{
ident_count++;
break;
}
else if (!(literal_p->status_flags & LEXER_FLAG_SOURCE_PTR))
{
jmem_heap_free_block ((void *) literal_p->u.char_p, literal_p->prop.length);
/* This literal should not be freed even if an error is encountered later. */
literal_p->status_flags |= LEXER_FLAG_SOURCE_PTR;
}
continue;
}
case LEXER_STRING_LITERAL:
{
const_literal_count++;
break;
}
case LEXER_NUMBER_LITERAL:
{
const_literal_count++;
continue;
}
case LEXER_FUNCTION_LITERAL:
case LEXER_REGEXP_LITERAL:
{
continue;
}
default:
{
JERRY_ASSERT (literal_p->type == LEXER_UNUSED_LITERAL);
continue;
}
}
const uint8_t *char_p = literal_p->u.char_p;
uint32_t status_flags = context_p->status_flags;
if ((literal_p->status_flags & LEXER_FLAG_SOURCE_PTR) && literal_p->prop.length < 0xfff)
{
size_t bytes_to_end = (size_t) (context_p->source_end_p - char_p);
if (bytes_to_end < 0xfffff)
{
literal_p->u.source_data = ((uint32_t) bytes_to_end) | (((uint32_t) literal_p->prop.length) << 20);
literal_p->status_flags |= LEXER_FLAG_LATE_INIT;
status_flags |= PARSER_HAS_LATE_LIT_INIT;
context_p->status_flags = status_flags;
char_p = NULL;
}
}
if (char_p != NULL)
{
literal_p->u.value = ecma_find_or_create_literal_string (char_p,
literal_p->prop.length,
(literal_p->status_flags & LEXER_FLAG_ASCII) != 0);
if (!(literal_p->status_flags & LEXER_FLAG_SOURCE_PTR))
{
jmem_heap_free_block ((void *) char_p, literal_p->prop.length);
/* This literal should not be freed even if an error is encountered later. */
literal_p->status_flags |= LEXER_FLAG_SOURCE_PTR;
}
}
}
ident_index = context_p->register_count;
const_literal_index = (uint16_t) (ident_index + ident_count);
literal_index = (uint16_t) (const_literal_index + const_literal_count);
/* Second phase: Assign an index to each literal. */
parser_list_iterator_init (&context_p->literal_pool, &literal_iterator);
while ((literal_p = (lexer_literal_t *) parser_list_iterator_next (&literal_iterator)))
{
switch (literal_p->type)
{
case LEXER_IDENT_LITERAL:
{
if (literal_p->status_flags & LEXER_FLAG_USED)
{
literal_p->prop.index = ident_index;
ident_index++;
}
break;
}
case LEXER_STRING_LITERAL:
case LEXER_NUMBER_LITERAL:
{
JERRY_ASSERT ((literal_p->status_flags & ~(LEXER_FLAG_SOURCE_PTR | LEXER_FLAG_LATE_INIT)) == 0);
literal_p->prop.index = const_literal_index;
const_literal_index++;
break;
}
case LEXER_FUNCTION_LITERAL:
case LEXER_REGEXP_LITERAL:
{
JERRY_ASSERT (literal_p->status_flags == 0);
literal_p->prop.index = literal_index;
literal_index++;
break;
}
default:
{
JERRY_ASSERT (literal_p->type == LEXER_UNUSED_LITERAL
&& literal_p->status_flags == LEXER_FLAG_FUNCTION_ARGUMENT);
break;
}
}
}
JERRY_ASSERT (ident_index == context_p->register_count + ident_count);
JERRY_ASSERT (const_literal_index == ident_index + const_literal_count);
JERRY_ASSERT (literal_index <= context_p->register_count + context_p->literal_count);
context_p->literal_count = literal_index;
*ident_end = ident_index;
*const_literal_end = const_literal_index;
} /* parser_compute_indicies */
/**
* Initialize literal pool.
*/
static void
parser_init_literal_pool (parser_context_t *context_p, /**< context */
ecma_value_t *literal_pool_p) /**< start of literal pool */
{
parser_list_iterator_t literal_iterator;
lexer_literal_t *literal_p;
parser_list_iterator_init (&context_p->literal_pool, &literal_iterator);
while ((literal_p = (lexer_literal_t *) parser_list_iterator_next (&literal_iterator)))
{
switch (literal_p->type)
{
case LEXER_IDENT_LITERAL:
{
if (!(literal_p->status_flags & LEXER_FLAG_USED))
{
break;
}
/* FALLTHRU */
}
case LEXER_STRING_LITERAL:
{
ecma_value_t lit_value = literal_p->u.value;
JERRY_ASSERT (literal_p->prop.index >= context_p->register_count);
literal_pool_p[literal_p->prop.index] = lit_value;
break;
}
case LEXER_NUMBER_LITERAL:
{
JERRY_ASSERT (literal_p->prop.index >= context_p->register_count);
literal_pool_p[literal_p->prop.index] = literal_p->u.value;
break;
}
case LEXER_FUNCTION_LITERAL:
case LEXER_REGEXP_LITERAL:
{
JERRY_ASSERT (literal_p->prop.index >= context_p->register_count);
ECMA_SET_INTERNAL_VALUE_POINTER (literal_pool_p[literal_p->prop.index], literal_p->u.bytecode_p);
break;
}
default:
{
JERRY_ASSERT (literal_p->type == LEXER_UNUSED_LITERAL);
break;
}
}
}
} /* parser_init_literal_pool */
/*
* During byte code post processing certain bytes are not
* copied into the final byte code buffer. For example, if
* one byte is enough for encoding a literal index, the
* second byte is not copied. However, when a byte is skipped,
* the offsets of those branches which crosses (jumps over)
* that byte code should also be decreased by one. Instead
* of finding these jumps every time when a byte is skipped,
* all branch offset updates are computed in one step.
*
* Branch offset mapping example:
*
* Let's assume that each parser_mem_page of the byte_code
* buffer is 8 bytes long and only 4 bytes are kept for a
* given page:
*
* +---+---+---+---+---+---+---+---+
* | X | 1 | 2 | 3 | X | 4 | X | X |
* +---+---+---+---+---+---+---+---+
*
* X marks those bytes which are removed. The resulting
* offset mapping is the following:
*
* +---+---+---+---+---+---+---+---+
* | 0 | 1 | 2 | 3 | 3 | 4 | 4 | 4 |
* +---+---+---+---+---+---+---+---+
*
* Each X is simply replaced by the index of the previous
* index starting from zero. This shows the number of
* copied bytes before a given byte including the byte
* itself. The last byte always shows the number of bytes
* copied from this page.
*
* This mapping allows recomputing all branch targets,
* since mapping[to] - mapping[from] is the new argument
* for forward branches. As for backward branches, the
* equation is reversed to mapping[from] - mapping[to].
*
* The mapping is relative to one page, so distance
* computation affecting multiple pages requires a loop.
* We should also note that only argument bytes can
* be skipped, so removed bytes cannot be targeted by
* branches. Valid branches always target instruction
* starts only.
*/
/**
* Recompute the argument of a forward branch.
*
* @return the new distance
*/
static size_t
parser_update_forward_branch (parser_mem_page_t *page_p, /**< current page */
size_t full_distance, /**< full distance */
uint8_t bytes_copied_before_jump) /**< bytes copied before jump */
{
size_t new_distance = 0;
while (full_distance > PARSER_CBC_STREAM_PAGE_SIZE)
{
new_distance += page_p->bytes[PARSER_CBC_STREAM_PAGE_SIZE - 1] & CBC_LOWER_SEVEN_BIT_MASK;
full_distance -= PARSER_CBC_STREAM_PAGE_SIZE;
page_p = page_p->next_p;
}
new_distance += page_p->bytes[full_distance - 1] & CBC_LOWER_SEVEN_BIT_MASK;
return new_distance - bytes_copied_before_jump;
} /* parser_update_forward_branch */
/**
* Recompute the argument of a backward branch.
*
* @return the new distance
*/
static size_t
parser_update_backward_branch (parser_mem_page_t *page_p, /**< current page */
size_t full_distance, /**< full distance */
uint8_t bytes_copied_before_jump) /**< bytes copied before jump */
{
size_t new_distance = bytes_copied_before_jump;
while (full_distance >= PARSER_CBC_STREAM_PAGE_SIZE)
{
JERRY_ASSERT (page_p != NULL);
new_distance += page_p->bytes[PARSER_CBC_STREAM_PAGE_SIZE - 1] & CBC_LOWER_SEVEN_BIT_MASK;
full_distance -= PARSER_CBC_STREAM_PAGE_SIZE;
page_p = page_p->next_p;
}
if (full_distance > 0)
{
size_t offset = PARSER_CBC_STREAM_PAGE_SIZE - full_distance;
JERRY_ASSERT (page_p != NULL);
new_distance += page_p->bytes[PARSER_CBC_STREAM_PAGE_SIZE - 1] & CBC_LOWER_SEVEN_BIT_MASK;
new_distance -= page_p->bytes[offset - 1] & CBC_LOWER_SEVEN_BIT_MASK;
}
return new_distance;
} /* parser_update_backward_branch */
/**
* Update targets of all branches in one step.
*/
static void
parse_update_branches (parser_context_t *context_p, /**< context */
uint8_t *byte_code_p) /**< byte code */
{
parser_mem_page_t *page_p = context_p->byte_code.first_p;
parser_mem_page_t *prev_page_p = NULL;
parser_mem_page_t *last_page_p = context_p->byte_code.last_p;
size_t last_position = context_p->byte_code.last_position;
size_t offset = 0;
size_t bytes_copied = 0;
if (last_position >= PARSER_CBC_STREAM_PAGE_SIZE)
{
last_page_p = NULL;
last_position = 0;
}
while (page_p != last_page_p || offset < last_position)
{
/* Branch instructions are marked to improve search speed. */
if (page_p->bytes[offset] & CBC_HIGHEST_BIT_MASK)
{
uint8_t *bytes_p = byte_code_p + bytes_copied;
uint8_t flags;
uint8_t bytes_copied_before_jump = 0;
size_t branch_argument_length;
size_t target_distance;
size_t length;
if (offset > 0)
{
bytes_copied_before_jump = page_p->bytes[offset - 1] & CBC_LOWER_SEVEN_BIT_MASK;
}
bytes_p += bytes_copied_before_jump;
if (*bytes_p == CBC_EXT_OPCODE)
{
bytes_p++;
flags = cbc_ext_flags[*bytes_p];
}
else
{
flags = cbc_flags[*bytes_p];
}
JERRY_ASSERT (flags & CBC_HAS_BRANCH_ARG);
branch_argument_length = CBC_BRANCH_OFFSET_LENGTH (*bytes_p);
bytes_p++;
/* Decoding target. */
length = branch_argument_length;
target_distance = 0;
do
{
target_distance = (target_distance << 8) | *bytes_p;
bytes_p++;
} while (--length > 0);
if (CBC_BRANCH_IS_FORWARD (flags))
{
/* Branch target was not set. */
JERRY_ASSERT (target_distance > 0);
target_distance = parser_update_forward_branch (page_p, offset + target_distance, bytes_copied_before_jump);
}
else
{
if (target_distance < offset)
{
uint8_t bytes_copied_before_target = page_p->bytes[offset - target_distance - 1];
bytes_copied_before_target = bytes_copied_before_target & CBC_LOWER_SEVEN_BIT_MASK;
target_distance = (size_t) (bytes_copied_before_jump - bytes_copied_before_target);
}
else if (target_distance == offset)
{
target_distance = bytes_copied_before_jump;
}
else
{
target_distance =
parser_update_backward_branch (prev_page_p, target_distance - offset, bytes_copied_before_jump);
}
}
/* Encoding target again. */
do
{
bytes_p--;
*bytes_p = (uint8_t) (target_distance & 0xff);
target_distance >>= 8;
} while (--branch_argument_length > 0);
}
offset++;
if (offset >= PARSER_CBC_STREAM_PAGE_SIZE)
{
parser_mem_page_t *next_p = page_p->next_p;
/* We reverse the pages before the current page. */
page_p->next_p = prev_page_p;
prev_page_p = page_p;
bytes_copied += page_p->bytes[PARSER_CBC_STREAM_PAGE_SIZE - 1] & CBC_LOWER_SEVEN_BIT_MASK;
page_p = next_p;
offset = 0;
}
}
/* After this point the pages of the byte code stream are
* not used anymore. However, they needs to be freed during
* cleanup, so the first and last pointers of the stream
* descriptor are reversed as well. */
if (last_page_p != NULL)
{
JERRY_ASSERT (last_page_p == context_p->byte_code.last_p);
last_page_p->next_p = prev_page_p;
}
else
{
last_page_p = context_p->byte_code.last_p;
}
context_p->byte_code.last_p = context_p->byte_code.first_p;
context_p->byte_code.first_p = last_page_p;
} /* parse_update_branches */
#if JERRY_DEBUGGER
/**
* Send current breakpoint list.
*/
static void
parser_send_breakpoints (parser_context_t *context_p, /**< context */
jerry_debugger_header_type_t type) /**< message type */
{
JERRY_ASSERT (JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED);
JERRY_ASSERT (context_p->breakpoint_info_count > 0);
jerry_debugger_send_data (type,
context_p->breakpoint_info,
context_p->breakpoint_info_count * sizeof (parser_breakpoint_info_t));
context_p->breakpoint_info_count = 0;
} /* parser_send_breakpoints */
/**
* Append a breakpoint info.
*/
void
parser_append_breakpoint_info (parser_context_t *context_p, /**< context */
jerry_debugger_header_type_t type, /**< message type */
uint32_t value) /**< line or offset of the breakpoint */
{
JERRY_ASSERT (JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED);
context_p->status_flags |= PARSER_DEBUGGER_BREAKPOINT_APPENDED;
if (context_p->breakpoint_info_count >= JERRY_DEBUGGER_SEND_MAX (parser_breakpoint_info_t))
{
parser_send_breakpoints (context_p, type);
}
context_p->breakpoint_info[context_p->breakpoint_info_count].value = value;
context_p->breakpoint_info_count = (uint16_t) (context_p->breakpoint_info_count + 1);
} /* parser_append_breakpoint_info */
#endif /* JERRY_DEBUGGER */
/**
* Forward iterator: move to the next byte code
*
* @param page_p page
* @param offset offset
*/
#define PARSER_NEXT_BYTE(page_p, offset) \
do \
{ \
if (++(offset) >= PARSER_CBC_STREAM_PAGE_SIZE) \
{ \
offset = 0; \
page_p = page_p->next_p; \
} \
} while (0)
/**
* Forward iterator: move to the next byte code. Also updates the offset of the previous byte code.
*
* @param page_p page
* @param offset offset
* @param real_offset real offset
*/
#define PARSER_NEXT_BYTE_UPDATE(page_p, offset, real_offset) \
do \
{ \
page_p->bytes[offset] = real_offset; \
if (++(offset) >= PARSER_CBC_STREAM_PAGE_SIZE) \
{ \
offset = 0; \
real_offset = 0; \
page_p = page_p->next_p; \
} \
} while (0)
/**
* Post processing main function.
*
* @return compiled code
*/
static ecma_compiled_code_t *
parser_post_processing (parser_context_t *context_p) /**< context */
{
uint16_t literal_one_byte_limit;
uint16_t ident_end;
uint16_t const_literal_end;
parser_mem_page_t *page_p;
parser_mem_page_t *last_page_p;
size_t last_position;
size_t offset;
size_t length;
size_t literal_length;
size_t total_size;
uint8_t real_offset;
uint8_t *byte_code_p;
bool needs_uint16_arguments;
cbc_opcode_t last_opcode = CBC_EXT_OPCODE;
ecma_compiled_code_t *compiled_code_p;
ecma_value_t *literal_pool_p;
uint8_t *dst_p;
if ((context_p->status_flags & (PARSER_IS_FUNCTION | PARSER_LEXICAL_BLOCK_NEEDED))
== (PARSER_IS_FUNCTION | PARSER_LEXICAL_BLOCK_NEEDED))
{
PARSER_MINUS_EQUAL_U16 (context_p->stack_depth, PARSER_BLOCK_CONTEXT_STACK_ALLOCATION);
#ifndef JERRY_NDEBUG
PARSER_MINUS_EQUAL_U16 (context_p->context_stack_depth, PARSER_BLOCK_CONTEXT_STACK_ALLOCATION);
#endif /* !JERRY_NDEBUG */
context_p->status_flags &= (uint32_t) ~PARSER_LEXICAL_BLOCK_NEEDED;
parser_emit_cbc (context_p, CBC_CONTEXT_END);
parser_branch_t branch;
parser_stack_pop (context_p, &branch, sizeof (parser_branch_t));
parser_set_branch_to_current_position (context_p, &branch);
JERRY_ASSERT (!(context_p->status_flags & PARSER_NO_END_LABEL));
}
if (PARSER_IS_NORMAL_ASYNC_FUNCTION (context_p->status_flags))
{
PARSER_MINUS_EQUAL_U16 (context_p->stack_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
#ifndef JERRY_NDEBUG
PARSER_MINUS_EQUAL_U16 (context_p->context_stack_depth, PARSER_TRY_CONTEXT_STACK_ALLOCATION);
#endif /* !JERRY_NDEBUG */
if (context_p->stack_limit < PARSER_FINALLY_CONTEXT_STACK_ALLOCATION)
{
context_p->stack_limit = PARSER_FINALLY_CONTEXT_STACK_ALLOCATION;
}
parser_branch_t branch;
parser_stack_pop (context_p, &branch, sizeof (parser_branch_t));
parser_set_branch_to_current_position (context_p, &branch);
JERRY_ASSERT (!(context_p->status_flags & PARSER_NO_END_LABEL));
}
#if JERRY_LINE_INFO
JERRY_ASSERT (context_p->line_info_p != NULL);
#endif /* JERRY_LINE_INFO */
JERRY_ASSERT (context_p->stack_depth == 0);
#ifndef JERRY_NDEBUG
JERRY_ASSERT (context_p->context_stack_depth == 0);
#endif /* !JERRY_NDEBUG */
if ((size_t) context_p->stack_limit + (size_t) context_p->register_count > PARSER_MAXIMUM_STACK_LIMIT)
{
parser_raise_error (context_p, PARSER_ERR_STACK_LIMIT_REACHED);
}
if (JERRY_UNLIKELY (context_p->script_p->refs_and_type >= CBC_SCRIPT_REF_MAX))
{
/* This is probably never happens in practice. */
jerry_fatal (JERRY_FATAL_REF_COUNT_LIMIT);
}
context_p->script_p->refs_and_type += CBC_SCRIPT_REF_ONE;
JERRY_ASSERT (context_p->literal_count <= PARSER_MAXIMUM_NUMBER_OF_LITERALS);
#if JERRY_DEBUGGER
if ((JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED)
&& !(context_p->status_flags & PARSER_DEBUGGER_BREAKPOINT_APPENDED))
{
/* Always provide at least one breakpoint. */
parser_emit_cbc (context_p, CBC_BREAKPOINT_DISABLED);
parser_flush_cbc (context_p);
parser_append_breakpoint_info (context_p, JERRY_DEBUGGER_BREAKPOINT_LIST, context_p->token.line);
context_p->last_breakpoint_line = context_p->token.line;
}
if ((JERRY_CONTEXT (debugger_flags) & JERRY_DEBUGGER_CONNECTED) && context_p->breakpoint_info_count > 0)
{
parser_send_breakpoints (context_p, JERRY_DEBUGGER_BREAKPOINT_LIST);
JERRY_ASSERT (context_p->breakpoint_info_count == 0);
}
#endif /* JERRY_DEBUGGER */
parser_compute_indicies (context_p, &ident_end, &const_literal_end);
if (context_p->literal_count <= CBC_MAXIMUM_SMALL_VALUE)
{
literal_one_byte_limit = CBC_MAXIMUM_BYTE_VALUE - 1;
}
else
{
literal_one_byte_limit = CBC_LOWER_SEVEN_BIT_MASK;
}
last_page_p = context_p->byte_code.last_p;
last_position = context_p->byte_code.last_position;
if (last_position >= PARSER_CBC_STREAM_PAGE_SIZE)
{
last_page_p = NULL;
last_position = 0;
}
page_p = context_p->byte_code.first_p;
offset = 0;
length = 0;
while (page_p != last_page_p || offset < last_position)
{
uint8_t *opcode_p;
uint8_t flags;
size_t branch_offset_length;
opcode_p = page_p->bytes + offset;
last_opcode = (cbc_opcode_t) (*opcode_p);
PARSER_NEXT_BYTE (page_p, offset);
branch_offset_length = CBC_BRANCH_OFFSET_LENGTH (last_opcode);
flags = cbc_flags[last_opcode];
length++;
switch (last_opcode)
{
case CBC_EXT_OPCODE:
{
cbc_ext_opcode_t ext_opcode;
ext_opcode = (cbc_ext_opcode_t) page_p->bytes[offset];
branch_offset_length = CBC_BRANCH_OFFSET_LENGTH (ext_opcode);
flags = cbc_ext_flags[ext_opcode];
PARSER_NEXT_BYTE (page_p, offset);
length++;
break;
}
case CBC_POST_DECR:
{
*opcode_p = CBC_PRE_DECR;
break;
}
case CBC_POST_INCR:
{
*opcode_p = CBC_PRE_INCR;
break;
}
case CBC_POST_DECR_IDENT:
{
*opcode_p = CBC_PRE_DECR_IDENT;
break;
}
case CBC_POST_INCR_IDENT:
{
*opcode_p = CBC_PRE_INCR_IDENT;
break;
}
default:
{
break;
}
}
while (flags & (CBC_HAS_LITERAL_ARG | CBC_HAS_LITERAL_ARG2))
{
uint8_t *first_byte = page_p->bytes + offset;
uint32_t literal_index = *first_byte;
PARSER_NEXT_BYTE (page_p, offset);
length++;
literal_index |= ((uint32_t) page_p->bytes[offset]) << 8;
if (literal_index >= PARSER_REGISTER_START)
{
literal_index -= PARSER_REGISTER_START;
}
else
{
literal_index = (PARSER_GET_LITERAL (literal_index))->prop.index;
}
if (literal_index <= literal_one_byte_limit)
{
*first_byte = (uint8_t) literal_index;
}
else
{
if (context_p->literal_count <= CBC_MAXIMUM_SMALL_VALUE)
{
JERRY_ASSERT (literal_index <= CBC_MAXIMUM_SMALL_VALUE);
*first_byte = CBC_MAXIMUM_BYTE_VALUE;
page_p->bytes[offset] = (uint8_t) (literal_index - CBC_MAXIMUM_BYTE_VALUE);
length++;
}
else
{
JERRY_ASSERT (literal_index <= CBC_MAXIMUM_FULL_VALUE);
*first_byte = (uint8_t) ((literal_index >> 8) | CBC_HIGHEST_BIT_MASK);
page_p->bytes[offset] = (uint8_t) (literal_index & 0xff);
length++;
}
}
PARSER_NEXT_BYTE (page_p, offset);
if (flags & CBC_HAS_LITERAL_ARG2)
{
if (flags & CBC_HAS_LITERAL_ARG)
{
flags = CBC_HAS_LITERAL_ARG;
}
else
{
flags = CBC_HAS_LITERAL_ARG | CBC_HAS_LITERAL_ARG2;
}
}
else
{
break;
}
}
if (flags & CBC_HAS_BYTE_ARG)
{
/* This argument will be copied without modification. */
PARSER_NEXT_BYTE (page_p, offset);
length++;
}
if (flags & CBC_HAS_BRANCH_ARG)
{
bool prefix_zero = true;
/* The leading zeroes are dropped from the stream.
* Although dropping these zeroes for backward
* branches are unnecessary, we use the same
* code path for simplicity. */
JERRY_ASSERT (branch_offset_length > 0 && branch_offset_length <= 3);
while (--branch_offset_length > 0)
{
uint8_t byte = page_p->bytes[offset];
if (byte > 0 || !prefix_zero)
{
prefix_zero = false;
length++;
}
else
{
JERRY_ASSERT (CBC_BRANCH_IS_FORWARD (flags));
}
PARSER_NEXT_BYTE (page_p, offset);
}
if (last_opcode == (cbc_opcode_t) (CBC_JUMP_FORWARD + PARSER_MAX_BRANCH_LENGTH - 1) && prefix_zero
&& page_p->bytes[offset] == PARSER_MAX_BRANCH_LENGTH + 1)
{
/* Uncoditional jumps which jump right after the instruction
* are effectively NOPs. These jumps are removed from the
* stream. The 1 byte long CBC_JUMP_FORWARD form marks these
* instructions, since this form is constructed during post
* processing and cannot be emitted directly. */
*opcode_p = CBC_JUMP_FORWARD;
length--;
}
else
{
/* Other last bytes are always copied. */
length++;
}
PARSER_NEXT_BYTE (page_p, offset);
}
}
if (!(context_p->status_flags & PARSER_NO_END_LABEL) || !(PARSER_OPCODE_IS_RETURN (last_opcode)))
{
context_p->status_flags &= (uint32_t) ~PARSER_NO_END_LABEL;
if (PARSER_IS_NORMAL_ASYNC_FUNCTION (context_p->status_flags))
{
length++;
}
length++;
}
needs_uint16_arguments = false;
total_size = sizeof (cbc_uint8_arguments_t);
if (context_p->stack_limit > CBC_MAXIMUM_BYTE_VALUE || context_p->register_count > CBC_MAXIMUM_BYTE_VALUE
|| context_p->literal_count > CBC_MAXIMUM_BYTE_VALUE)
{
needs_uint16_arguments = true;
total_size = sizeof (cbc_uint16_arguments_t);
}
literal_length = (size_t) (context_p->literal_count - context_p->register_count) * sizeof (ecma_value_t);
total_size += literal_length + length;
if (PARSER_NEEDS_MAPPED_ARGUMENTS (context_p->status_flags))
{
total_size += context_p->argument_count * sizeof (ecma_value_t);
}
/* function.name */
if (!(context_p->status_flags & PARSER_CLASS_CONSTRUCTOR))
{
total_size += sizeof (ecma_value_t);
}
if (context_p->tagged_template_literal_cp != JMEM_CP_NULL)
{
total_size += sizeof (ecma_value_t);
}
#if JERRY_LINE_INFO
total_size += sizeof (ecma_value_t);
#endif /* JERRY_LINE_INFO */
uint8_t extended_info = 0;
if (context_p->argument_length != UINT16_MAX)
{
extended_info |= CBC_EXTENDED_CODE_FLAGS_HAS_ARGUMENT_LENGTH;
total_size += ecma_extended_info_get_encoded_length (context_p->argument_length);
}
#if JERRY_FUNCTION_TO_STRING
if (context_p->last_context_p != NULL)
{
extended_info |= CBC_EXTENDED_CODE_FLAGS_HAS_SOURCE_CODE_RANGE;
const uint8_t *start_p = context_p->source_start_p;
const uint8_t *function_start_p = context_p->last_context_p->function_start_p;
if (function_start_p < start_p || function_start_p >= start_p + context_p->source_size)
{
JERRY_ASSERT (context_p->arguments_start_p != NULL && function_start_p >= context_p->arguments_start_p
&& function_start_p < context_p->arguments_start_p + context_p->arguments_size);
start_p = context_p->arguments_start_p;
extended_info |= CBC_EXTENDED_CODE_FLAGS_SOURCE_CODE_IN_ARGUMENTS;
}
total_size += ecma_extended_info_get_encoded_length ((uint32_t) (function_start_p - start_p));
total_size += ecma_extended_info_get_encoded_length ((uint32_t) (context_p->function_end_p - function_start_p));
}
#endif /* JERRY_FUNCTION_TO_STRING */
if (extended_info != 0)
{
total_size += sizeof (uint8_t);
}
total_size = JERRY_ALIGNUP (total_size, JMEM_ALIGNMENT);
compiled_code_p = (ecma_compiled_code_t *) parser_malloc (context_p, total_size);
#if JERRY_SNAPSHOT_SAVE || JERRY_PARSER_DUMP_BYTE_CODE
// Avoid getting junk bytes
memset (compiled_code_p, 0, total_size);
#endif /* JERRY_SNAPSHOT_SAVE || JERRY_PARSER_DUMP_BYTE_CODE */
#if JERRY_MEM_STATS
jmem_stats_allocate_byte_code_bytes (total_size);
#endif /* JERRY_MEM_STATS */
byte_code_p = (uint8_t *) compiled_code_p;
compiled_code_p->size = (uint16_t) (total_size >> JMEM_ALIGNMENT_LOG);
compiled_code_p->refs = 1;
compiled_code_p->status_flags = 0;
if (context_p->status_flags & PARSER_FUNCTION_HAS_REST_PARAM)
{
JERRY_ASSERT (context_p->argument_count > 0);
context_p->argument_count--;
}
if (needs_uint16_arguments)
{
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) compiled_code_p;
args_p->stack_limit = context_p->stack_limit;
args_p->script_value = context_p->script_value;
args_p->argument_end = context_p->argument_count;
args_p->register_end = context_p->register_count;
args_p->ident_end = ident_end;
args_p->const_literal_end = const_literal_end;
args_p->literal_end = context_p->literal_count;
compiled_code_p->status_flags |= CBC_CODE_FLAGS_UINT16_ARGUMENTS;
byte_code_p += sizeof (cbc_uint16_arguments_t);
}
else
{
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) compiled_code_p;
args_p->stack_limit = (uint8_t) context_p->stack_limit;
args_p->argument_end = (uint8_t) context_p->argument_count;
args_p->script_value = context_p->script_value;
args_p->register_end = (uint8_t) context_p->register_count;
args_p->ident_end = (uint8_t) ident_end;
args_p->const_literal_end = (uint8_t) const_literal_end;
args_p->literal_end = (uint8_t) context_p->literal_count;
byte_code_p += sizeof (cbc_uint8_arguments_t);
}
uint16_t encoding_limit;
uint16_t encoding_delta;
if (context_p->literal_count > CBC_MAXIMUM_SMALL_VALUE)
{
compiled_code_p->status_flags |= CBC_CODE_FLAGS_FULL_LITERAL_ENCODING;
encoding_limit = CBC_FULL_LITERAL_ENCODING_LIMIT;
encoding_delta = CBC_FULL_LITERAL_ENCODING_DELTA;