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jerry-snapshot.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 "jerry-snapshot.h"
#include "jerryscript.h"
#include "ecma-conversion.h"
#include "ecma-errors.h"
#include "ecma-exceptions.h"
#include "ecma-function-object.h"
#include "ecma-helpers.h"
#include "ecma-lex-env.h"
#include "ecma-literal-storage.h"
#include "jcontext.h"
#include "js-parser-internal.h"
#include "js-parser.h"
#include "lit-char-helpers.h"
#include "re-compiler.h"
/** \addtogroup jerrysnapshot Jerry snapshot operations
* @{
*/
#if JERRY_SNAPSHOT_SAVE || JERRY_SNAPSHOT_EXEC
/**
* Get snapshot configuration flags.
*
* @return configuration flags
*/
static inline uint32_t JERRY_ATTR_ALWAYS_INLINE
snapshot_get_global_flags (bool has_regex, /**< regex literal is present */
bool has_class) /**< class literal is present */
{
JERRY_UNUSED (has_regex);
JERRY_UNUSED (has_class);
uint32_t flags = 0;
#if JERRY_BUILTIN_REGEXP
flags |= (has_regex ? JERRY_SNAPSHOT_HAS_REGEX_LITERAL : 0);
#endif /* JERRY_BUILTIN_REGEXP */
flags |= (has_class ? JERRY_SNAPSHOT_HAS_CLASS_LITERAL : 0);
return flags;
} /* snapshot_get_global_flags */
/**
* Checks whether the global_flags argument matches to the current feature set.
*
* @return true if global_flags accepted, false otherwise
*/
static inline bool JERRY_ATTR_ALWAYS_INLINE
snapshot_check_global_flags (uint32_t global_flags) /**< global flags */
{
#if JERRY_BUILTIN_REGEXP
global_flags &= (uint32_t) ~JERRY_SNAPSHOT_HAS_REGEX_LITERAL;
#endif /* JERRY_BUILTIN_REGEXP */
global_flags &= (uint32_t) ~JERRY_SNAPSHOT_HAS_CLASS_LITERAL;
return global_flags == snapshot_get_global_flags (false, false);
} /* snapshot_check_global_flags */
#endif /* JERRY_SNAPSHOT_SAVE || JERRY_SNAPSHOT_EXEC */
#if JERRY_SNAPSHOT_SAVE
/**
* Variables required to take a snapshot.
*/
typedef struct
{
size_t snapshot_buffer_write_offset;
ecma_value_t snapshot_error;
bool regex_found;
bool class_found;
} snapshot_globals_t;
/**
* Write data into the specified buffer.
*
* Note:
* Offset is in-out and is incremented if the write operation completes successfully.
*
* @return true - if write was successful, i.e. offset + data_size doesn't exceed buffer size,
* false - otherwise
*/
static inline bool JERRY_ATTR_ALWAYS_INLINE
snapshot_write_to_buffer_by_offset (uint8_t *buffer_p, /**< buffer */
size_t buffer_size, /**< size of buffer */
size_t *in_out_buffer_offset_p, /**< [in,out] offset to write to
* incremented with data_size */
const void *data_p, /**< data */
size_t data_size) /**< size of the writable data */
{
if (*in_out_buffer_offset_p + data_size > buffer_size)
{
return false;
}
memcpy (buffer_p + *in_out_buffer_offset_p, data_p, data_size);
*in_out_buffer_offset_p += data_size;
return true;
} /* snapshot_write_to_buffer_by_offset */
/**
* Maximum snapshot write buffer offset.
*/
#if !JERRY_NUMBER_TYPE_FLOAT64
#define JERRY_SNAPSHOT_MAXIMUM_WRITE_OFFSET (0x7fffff >> 1)
#else /* JERRY_NUMBER_TYPE_FLOAT64 */
#define JERRY_SNAPSHOT_MAXIMUM_WRITE_OFFSET (UINT32_MAX >> 1)
#endif /* !JERRY_NUMBER_TYPE_FLOAT64 */
/**
* Save snapshot helper.
*
* @return start offset
*/
static uint32_t
snapshot_add_compiled_code (const ecma_compiled_code_t *compiled_code_p, /**< compiled code */
uint8_t *snapshot_buffer_p, /**< snapshot buffer */
size_t snapshot_buffer_size, /**< snapshot buffer size */
snapshot_globals_t *globals_p) /**< snapshot globals */
{
const char *error_buffer_too_small_p = "Snapshot buffer too small";
if (!ecma_is_value_empty (globals_p->snapshot_error))
{
return 0;
}
JERRY_ASSERT ((globals_p->snapshot_buffer_write_offset & (JMEM_ALIGNMENT - 1)) == 0);
if (globals_p->snapshot_buffer_write_offset > JERRY_SNAPSHOT_MAXIMUM_WRITE_OFFSET)
{
globals_p->snapshot_error = jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_MAXIMUM_SNAPSHOT_SIZE));
return 0;
}
/* The snapshot generator always parses a single file,
* so the base always starts right after the snapshot header. */
uint32_t start_offset = (uint32_t) (globals_p->snapshot_buffer_write_offset - sizeof (jerry_snapshot_header_t));
uint8_t *copied_code_start_p = snapshot_buffer_p + globals_p->snapshot_buffer_write_offset;
ecma_compiled_code_t *copied_code_p = (ecma_compiled_code_t *) copied_code_start_p;
if (compiled_code_p->status_flags & CBC_CODE_FLAGS_HAS_TAGGED_LITERALS)
{
globals_p->snapshot_error =
jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_TAGGED_TEMPLATE_LITERALS));
return 0;
}
if (CBC_FUNCTION_GET_TYPE (compiled_code_p->status_flags) == CBC_FUNCTION_CONSTRUCTOR)
{
globals_p->class_found = true;
}
#if JERRY_BUILTIN_REGEXP
if (!CBC_IS_FUNCTION (compiled_code_p->status_flags))
{
/* Regular expression. */
if (globals_p->snapshot_buffer_write_offset + sizeof (ecma_compiled_code_t) > snapshot_buffer_size)
{
globals_p->snapshot_error = jerry_throw_sz (JERRY_ERROR_RANGE, error_buffer_too_small_p);
return 0;
}
globals_p->snapshot_buffer_write_offset += sizeof (ecma_compiled_code_t);
ecma_value_t pattern = ((re_compiled_code_t *) compiled_code_p)->source;
ecma_string_t *pattern_string_p = ecma_get_string_from_value (pattern);
lit_utf8_size_t pattern_size = 0;
ECMA_STRING_TO_UTF8_STRING (pattern_string_p, buffer);
pattern_size = buffer.size;
if (!snapshot_write_to_buffer_by_offset (snapshot_buffer_p,
snapshot_buffer_size,
&globals_p->snapshot_buffer_write_offset,
buffer.ptr,
buffer.size))
{
globals_p->snapshot_error = jerry_throw_sz (JERRY_ERROR_RANGE, error_buffer_too_small_p);
}
if (!ecma_is_value_empty (globals_p->snapshot_error))
{
return 0;
}
globals_p->regex_found = true;
globals_p->snapshot_buffer_write_offset = JERRY_ALIGNUP (globals_p->snapshot_buffer_write_offset, JMEM_ALIGNMENT);
/* Regexp character size is stored in refs. */
copied_code_p->refs = (uint16_t) pattern_size;
pattern_size += (lit_utf8_size_t) sizeof (ecma_compiled_code_t);
copied_code_p->size = (uint16_t) ((pattern_size + JMEM_ALIGNMENT - 1) >> JMEM_ALIGNMENT_LOG);
copied_code_p->status_flags = compiled_code_p->status_flags;
return start_offset;
}
#endif /* JERRY_BUILTIN_REGEXP */
JERRY_ASSERT (CBC_IS_FUNCTION (compiled_code_p->status_flags));
if (!snapshot_write_to_buffer_by_offset (snapshot_buffer_p,
snapshot_buffer_size,
&globals_p->snapshot_buffer_write_offset,
compiled_code_p,
((size_t) compiled_code_p->size) << JMEM_ALIGNMENT_LOG))
{
globals_p->snapshot_error = jerry_throw_sz (JERRY_ERROR_RANGE, error_buffer_too_small_p);
return 0;
}
/* Sub-functions and regular expressions are stored recursively. */
uint8_t *buffer_p = (uint8_t *) copied_code_p;
ecma_value_t *literal_start_p;
uint32_t const_literal_end;
uint32_t literal_end;
#if JERRY_LINE_INFO
/* TODO: support snapshots. */
((ecma_compiled_code_t *) buffer_p)->status_flags &= (uint16_t) ~CBC_CODE_FLAGS_HAS_LINE_INFO;
#endif /* JERRY_LINE_INFO */
if (compiled_code_p->status_flags & CBC_CODE_FLAGS_UINT16_ARGUMENTS)
{
literal_start_p = (ecma_value_t *) (buffer_p + sizeof (cbc_uint16_arguments_t));
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) buffer_p;
literal_end = (uint32_t) (args_p->literal_end - args_p->register_end);
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
}
else
{
literal_start_p = (ecma_value_t *) (buffer_p + sizeof (cbc_uint8_arguments_t));
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) buffer_p;
literal_end = (uint32_t) (args_p->literal_end - args_p->register_end);
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
}
for (uint32_t i = const_literal_end; i < literal_end; i++)
{
ecma_compiled_code_t *bytecode_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t, literal_start_p[i]);
if (bytecode_p == compiled_code_p)
{
literal_start_p[i] = 0;
}
else
{
uint32_t offset = snapshot_add_compiled_code (bytecode_p, snapshot_buffer_p, snapshot_buffer_size, globals_p);
JERRY_ASSERT (!ecma_is_value_empty (globals_p->snapshot_error) || offset > start_offset);
literal_start_p[i] = offset - start_offset;
}
}
return start_offset;
} /* snapshot_add_compiled_code */
/**
* Create unsupported literal error.
*/
static void
static_snapshot_error_unsupported_literal (snapshot_globals_t *globals_p, /**< snapshot globals */
ecma_value_t literal) /**< literal form the literal pool */
{
lit_utf8_byte_t *str_p = (lit_utf8_byte_t *) "Unsupported static snapshot literal: ";
ecma_stringbuilder_t builder = ecma_stringbuilder_create_raw (str_p, 37);
JERRY_ASSERT (!ECMA_IS_VALUE_ERROR (literal));
ecma_string_t *literal_string_p = ecma_op_to_string (literal);
JERRY_ASSERT (literal_string_p != NULL);
ecma_stringbuilder_append (&builder, literal_string_p);
ecma_deref_ecma_string (literal_string_p);
ecma_object_t *error_object_p = ecma_new_standard_error (JERRY_ERROR_RANGE, ecma_stringbuilder_finalize (&builder));
globals_p->snapshot_error = ecma_create_exception_from_object (error_object_p);
} /* static_snapshot_error_unsupported_literal */
/**
* Save static snapshot helper.
*
* @return start offset
*/
static uint32_t
static_snapshot_add_compiled_code (const ecma_compiled_code_t *compiled_code_p, /**< compiled code */
uint8_t *snapshot_buffer_p, /**< snapshot buffer */
size_t snapshot_buffer_size, /**< snapshot buffer size */
snapshot_globals_t *globals_p) /**< snapshot globals */
{
if (!ecma_is_value_empty (globals_p->snapshot_error))
{
return 0;
}
JERRY_ASSERT ((globals_p->snapshot_buffer_write_offset & (JMEM_ALIGNMENT - 1)) == 0);
if (globals_p->snapshot_buffer_write_offset >= JERRY_SNAPSHOT_MAXIMUM_WRITE_OFFSET)
{
globals_p->snapshot_error = jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_MAXIMUM_SNAPSHOT_SIZE));
return 0;
}
/* The snapshot generator always parses a single file,
* so the base always starts right after the snapshot header. */
uint32_t start_offset = (uint32_t) (globals_p->snapshot_buffer_write_offset - sizeof (jerry_snapshot_header_t));
uint8_t *copied_code_start_p = snapshot_buffer_p + globals_p->snapshot_buffer_write_offset;
ecma_compiled_code_t *copied_code_p = (ecma_compiled_code_t *) copied_code_start_p;
if (!CBC_IS_FUNCTION (compiled_code_p->status_flags))
{
/* Regular expression literals are not supported. */
globals_p->snapshot_error =
jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_REGULAR_EXPRESSION_NOT_SUPPORTED));
return 0;
}
if (!snapshot_write_to_buffer_by_offset (snapshot_buffer_p,
snapshot_buffer_size,
&globals_p->snapshot_buffer_write_offset,
compiled_code_p,
((size_t) compiled_code_p->size) << JMEM_ALIGNMENT_LOG))
{
globals_p->snapshot_error = jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_SNAPSHOT_BUFFER_SMALL));
return 0;
}
/* Sub-functions and regular expressions are stored recursively. */
uint8_t *buffer_p = (uint8_t *) copied_code_p;
ecma_value_t *literal_start_p;
uint32_t const_literal_end;
uint32_t literal_end;
((ecma_compiled_code_t *) copied_code_p)->status_flags |= CBC_CODE_FLAGS_STATIC_FUNCTION;
if (compiled_code_p->status_flags & CBC_CODE_FLAGS_UINT16_ARGUMENTS)
{
literal_start_p = (ecma_value_t *) (buffer_p + sizeof (cbc_uint16_arguments_t));
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) buffer_p;
literal_end = (uint32_t) (args_p->literal_end - args_p->register_end);
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
args_p->script_value = JMEM_CP_NULL;
}
else
{
literal_start_p = (ecma_value_t *) (buffer_p + sizeof (cbc_uint8_arguments_t));
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) buffer_p;
literal_end = (uint32_t) (args_p->literal_end - args_p->register_end);
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
args_p->script_value = JMEM_CP_NULL;
}
for (uint32_t i = 0; i < const_literal_end; i++)
{
if (!ecma_is_value_direct (literal_start_p[i]) && !ecma_is_value_direct_string (literal_start_p[i]))
{
static_snapshot_error_unsupported_literal (globals_p, literal_start_p[i]);
return 0;
}
}
for (uint32_t i = const_literal_end; i < literal_end; i++)
{
ecma_compiled_code_t *bytecode_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t, literal_start_p[i]);
if (bytecode_p == compiled_code_p)
{
literal_start_p[i] = 0;
}
else
{
uint32_t offset =
static_snapshot_add_compiled_code (bytecode_p, snapshot_buffer_p, snapshot_buffer_size, globals_p);
JERRY_ASSERT (!ecma_is_value_empty (globals_p->snapshot_error) || offset > start_offset);
literal_start_p[i] = offset - start_offset;
}
}
buffer_p += ((size_t) compiled_code_p->size) << JMEM_ALIGNMENT_LOG;
literal_start_p = ecma_snapshot_resolve_serializable_values (compiled_code_p, buffer_p);
while (literal_start_p < (ecma_value_t *) buffer_p)
{
if (!ecma_is_value_direct_string (*literal_start_p) && !ecma_is_value_empty (*literal_start_p))
{
static_snapshot_error_unsupported_literal (globals_p, *literal_start_p);
return 0;
}
literal_start_p++;
}
return start_offset;
} /* static_snapshot_add_compiled_code */
/**
* Set the uint16_t offsets in the code area.
*/
static void
jerry_snapshot_set_offsets (uint32_t *buffer_p, /**< buffer */
uint32_t size, /**< buffer size */
lit_mem_to_snapshot_id_map_entry_t *lit_map_p) /**< literal map */
{
JERRY_ASSERT (size > 0);
do
{
ecma_compiled_code_t *bytecode_p = (ecma_compiled_code_t *) buffer_p;
uint32_t code_size = ((uint32_t) bytecode_p->size) << JMEM_ALIGNMENT_LOG;
if (CBC_IS_FUNCTION (bytecode_p->status_flags))
{
ecma_value_t *literal_start_p;
uint32_t const_literal_end;
if (bytecode_p->status_flags & CBC_CODE_FLAGS_UINT16_ARGUMENTS)
{
literal_start_p = (ecma_value_t *) (((uint8_t *) buffer_p) + sizeof (cbc_uint16_arguments_t));
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) buffer_p;
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
}
else
{
literal_start_p = (ecma_value_t *) (((uint8_t *) buffer_p) + sizeof (cbc_uint8_arguments_t));
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) buffer_p;
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
}
for (uint32_t i = 0; i < const_literal_end; i++)
{
if (ecma_is_value_string (literal_start_p[i])
#if JERRY_BUILTIN_BIGINT
|| ecma_is_value_bigint (literal_start_p[i])
#endif /* JERRY_BUILTIN_BIGINT */
|| ecma_is_value_float_number (literal_start_p[i]))
{
lit_mem_to_snapshot_id_map_entry_t *current_p = lit_map_p;
while (current_p->literal_id != literal_start_p[i])
{
current_p++;
}
literal_start_p[i] = current_p->literal_offset;
}
}
uint8_t *byte_p = (uint8_t *) bytecode_p + (((size_t) bytecode_p->size) << JMEM_ALIGNMENT_LOG);
literal_start_p = ecma_snapshot_resolve_serializable_values (bytecode_p, byte_p);
while (literal_start_p < (ecma_value_t *) byte_p)
{
if (*literal_start_p != ECMA_VALUE_EMPTY)
{
JERRY_ASSERT (ecma_is_value_string (*literal_start_p));
lit_mem_to_snapshot_id_map_entry_t *current_p = lit_map_p;
while (current_p->literal_id != *literal_start_p)
{
current_p++;
}
*literal_start_p = current_p->literal_offset;
}
literal_start_p++;
}
/* Set reference counter to 1. */
bytecode_p->refs = 1;
}
JERRY_ASSERT ((code_size % sizeof (uint32_t)) == 0);
buffer_p += code_size / sizeof (uint32_t);
size -= code_size;
} while (size > 0);
} /* jerry_snapshot_set_offsets */
#endif /* JERRY_SNAPSHOT_SAVE */
#if JERRY_SNAPSHOT_EXEC
/**
* Byte code blocks shorter than this threshold are always copied into the memory.
* The memory / performance trade-of of byte code redirection does not worth
* in such cases.
*/
#define BYTECODE_NO_COPY_THRESHOLD 8
/**
* Load byte code from snapshot.
*
* @return byte code
*/
static ecma_compiled_code_t *
snapshot_load_compiled_code (const uint8_t *base_addr_p, /**< base address of the
* current primary function */
const uint8_t *literal_base_p, /**< literal start */
cbc_script_t *script_p, /**< script */
bool copy_bytecode) /**< byte code should be copied to memory */
{
ecma_compiled_code_t *bytecode_p = (ecma_compiled_code_t *) base_addr_p;
uint32_t code_size = ((uint32_t) bytecode_p->size) << JMEM_ALIGNMENT_LOG;
#if JERRY_BUILTIN_REGEXP
if (!CBC_IS_FUNCTION (bytecode_p->status_flags))
{
const uint8_t *regex_start_p = ((const uint8_t *) bytecode_p) + sizeof (ecma_compiled_code_t);
/* Real size is stored in refs. */
ecma_string_t *pattern_str_p = ecma_new_ecma_string_from_utf8 (regex_start_p, bytecode_p->refs);
const re_compiled_code_t *re_bytecode_p = re_compile_bytecode (pattern_str_p, bytecode_p->status_flags);
ecma_deref_ecma_string (pattern_str_p);
return (ecma_compiled_code_t *) re_bytecode_p;
}
#else /* !JERRY_BUILTIN_REGEXP */
JERRY_ASSERT (CBC_IS_FUNCTION (bytecode_p->status_flags));
#endif /* JERRY_BUILTIN_REGEXP */
size_t header_size;
uint32_t argument_end;
uint32_t const_literal_end;
uint32_t literal_end;
if (JERRY_UNLIKELY (script_p->refs_and_type >= CBC_SCRIPT_REF_MAX))
{
/* This is probably never happens in practice. */
jerry_fatal (JERRY_FATAL_REF_COUNT_LIMIT);
}
script_p->refs_and_type += CBC_SCRIPT_REF_ONE;
if (bytecode_p->status_flags & CBC_CODE_FLAGS_UINT16_ARGUMENTS)
{
uint8_t *byte_p = (uint8_t *) bytecode_p;
cbc_uint16_arguments_t *args_p = (cbc_uint16_arguments_t *) byte_p;
argument_end = args_p->argument_end;
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
literal_end = (uint32_t) (args_p->literal_end - args_p->register_end);
header_size = sizeof (cbc_uint16_arguments_t);
ECMA_SET_INTERNAL_VALUE_POINTER (args_p->script_value, script_p);
}
else
{
uint8_t *byte_p = (uint8_t *) bytecode_p;
cbc_uint8_arguments_t *args_p = (cbc_uint8_arguments_t *) byte_p;
argument_end = args_p->argument_end;
const_literal_end = (uint32_t) (args_p->const_literal_end - args_p->register_end);
literal_end = (uint32_t) (args_p->literal_end - args_p->register_end);
header_size = sizeof (cbc_uint8_arguments_t);
ECMA_SET_INTERNAL_VALUE_POINTER (args_p->script_value, script_p);
}
if (copy_bytecode || (header_size + (literal_end * sizeof (uint16_t)) + BYTECODE_NO_COPY_THRESHOLD > code_size))
{
bytecode_p = (ecma_compiled_code_t *) jmem_heap_alloc_block (code_size);
#if JERRY_MEM_STATS
jmem_stats_allocate_byte_code_bytes (code_size);
#endif /* JERRY_MEM_STATS */
memcpy (bytecode_p, base_addr_p, code_size);
}
else
{
uint32_t start_offset = (uint32_t) (header_size + literal_end * sizeof (ecma_value_t));
uint8_t *real_bytecode_p = ((uint8_t *) bytecode_p) + start_offset;
uint32_t new_code_size = (uint32_t) (start_offset + 1 + sizeof (uint8_t *));
uint32_t extra_bytes = 0;
if (bytecode_p->status_flags & CBC_CODE_FLAGS_MAPPED_ARGUMENTS_NEEDED)
{
extra_bytes += (uint32_t) (argument_end * sizeof (ecma_value_t));
}
/* function name */
if (CBC_FUNCTION_GET_TYPE (bytecode_p->status_flags) != CBC_FUNCTION_CONSTRUCTOR)
{
extra_bytes += (uint32_t) sizeof (ecma_value_t);
}
/* tagged template literals */
if (bytecode_p->status_flags & CBC_CODE_FLAGS_HAS_TAGGED_LITERALS)
{
extra_bytes += (uint32_t) sizeof (ecma_value_t);
}
#if JERRY_SOURCE_NAME
/* source name */
extra_bytes += (uint32_t) sizeof (ecma_value_t);
#endif /* JERRY_SOURCE_NAME */
new_code_size = JERRY_ALIGNUP (new_code_size + extra_bytes, JMEM_ALIGNMENT);
bytecode_p = (ecma_compiled_code_t *) jmem_heap_alloc_block (new_code_size);
#if JERRY_MEM_STATS
jmem_stats_allocate_byte_code_bytes (new_code_size);
#endif /* JERRY_MEM_STATS */
memcpy (bytecode_p, base_addr_p, start_offset);
bytecode_p->size = (uint16_t) (new_code_size >> JMEM_ALIGNMENT_LOG);
uint8_t *byte_p = (uint8_t *) bytecode_p;
uint8_t *new_base_p = byte_p + new_code_size - extra_bytes;
const uint8_t *base_p = base_addr_p + code_size - extra_bytes;
if (extra_bytes != 0)
{
memcpy (new_base_p, base_p, extra_bytes);
}
byte_p[start_offset] = CBC_SET_BYTECODE_PTR;
memcpy (byte_p + start_offset + 1, &real_bytecode_p, sizeof (uintptr_t));
code_size = new_code_size;
}
JERRY_ASSERT (bytecode_p->refs == 1);
#if JERRY_DEBUGGER
bytecode_p->status_flags = (uint16_t) (bytecode_p->status_flags | CBC_CODE_FLAGS_DEBUGGER_IGNORE);
#endif /* JERRY_DEBUGGER */
ecma_value_t *literal_start_p = (ecma_value_t *) (((uint8_t *) bytecode_p) + header_size);
for (uint32_t i = 0; i < const_literal_end; i++)
{
if ((literal_start_p[i] & ECMA_VALUE_TYPE_MASK) == ECMA_TYPE_SNAPSHOT_OFFSET)
{
literal_start_p[i] = ecma_snapshot_get_literal (literal_base_p, literal_start_p[i]);
}
}
for (uint32_t i = const_literal_end; i < literal_end; i++)
{
size_t literal_offset = (size_t) literal_start_p[i];
if (literal_offset == 0)
{
/* Self reference */
ECMA_SET_INTERNAL_VALUE_POINTER (literal_start_p[i], bytecode_p);
}
else
{
ecma_compiled_code_t *literal_bytecode_p;
literal_bytecode_p =
snapshot_load_compiled_code (base_addr_p + literal_offset, literal_base_p, script_p, copy_bytecode);
ECMA_SET_INTERNAL_VALUE_POINTER (literal_start_p[i], literal_bytecode_p);
}
}
uint8_t *byte_p = ((uint8_t *) bytecode_p) + code_size;
literal_start_p = ecma_snapshot_resolve_serializable_values (bytecode_p, byte_p);
while (literal_start_p < (ecma_value_t *) byte_p)
{
if ((*literal_start_p & ECMA_VALUE_TYPE_MASK) == ECMA_TYPE_SNAPSHOT_OFFSET)
{
*literal_start_p = ecma_snapshot_get_literal (literal_base_p, *literal_start_p);
}
literal_start_p++;
}
return bytecode_p;
} /* snapshot_load_compiled_code */
#endif /* JERRY_SNAPSHOT_EXEC */
/**
* Generate snapshot from specified source and arguments
*
* @return size of snapshot (a number value), if it was generated succesfully
* (i.e. there are no syntax errors in source code, buffer size is sufficient,
* and snapshot support is enabled in current configuration through JERRY_SNAPSHOT_SAVE),
* error object otherwise
*/
jerry_value_t
jerry_generate_snapshot (jerry_value_t compiled_code, /**< parsed script or function */
uint32_t generate_snapshot_opts, /**< jerry_generate_snapshot_opts_t option bits */
uint32_t *buffer_p, /**< buffer to save snapshot to */
size_t buffer_size) /**< the buffer's size */
{
#if JERRY_SNAPSHOT_SAVE
uint32_t allowed_options = JERRY_SNAPSHOT_SAVE_STATIC;
if ((generate_snapshot_opts & ~allowed_options) != 0)
{
return jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_SNAPSHOT_FLAG_NOT_SUPPORTED));
}
const ecma_compiled_code_t *bytecode_data_p = NULL;
if (ecma_is_value_object (compiled_code))
{
ecma_object_t *object_p = ecma_get_object_from_value (compiled_code);
if (ecma_object_class_is (object_p, ECMA_OBJECT_CLASS_SCRIPT))
{
ecma_extended_object_t *ext_object_p = (ecma_extended_object_t *) object_p;
bytecode_data_p = ECMA_GET_INTERNAL_VALUE_POINTER (ecma_compiled_code_t, ext_object_p->u.cls.u3.value);
}
else if (ecma_get_object_type (object_p) == ECMA_OBJECT_TYPE_FUNCTION)
{
ecma_extended_object_t *ext_func_p = (ecma_extended_object_t *) object_p;
bytecode_data_p = ecma_op_function_get_compiled_code (ext_func_p);
uint16_t type = CBC_FUNCTION_GET_TYPE (bytecode_data_p->status_flags);
if (type != CBC_FUNCTION_NORMAL)
{
bytecode_data_p = NULL;
}
}
}
if (JERRY_UNLIKELY (bytecode_data_p == NULL))
{
return jerry_throw_sz (JERRY_ERROR_RANGE, ecma_get_error_msg (ECMA_ERR_SNAPSHOT_UNSUPPORTED_COMPILED_CODE));
}
snapshot_globals_t globals;
const uint32_t aligned_header_size = JERRY_ALIGNUP (sizeof (jerry_snapshot_header_t), JMEM_ALIGNMENT);
globals.snapshot_buffer_write_offset = aligned_header_size;
globals.snapshot_error = ECMA_VALUE_EMPTY;
globals.regex_found = false;
globals.class_found = false;
if (generate_snapshot_opts & JERRY_SNAPSHOT_SAVE_STATIC)
{
static_snapshot_add_compiled_code (bytecode_data_p, (uint8_t *) buffer_p, buffer_size, &globals);
}
else
{
snapshot_add_compiled_code (bytecode_data_p, (uint8_t *) buffer_p, buffer_size, &globals);
}
if (!ecma_is_value_empty (globals.snapshot_error))
{
return globals.snapshot_error;
}
jerry_snapshot_header_t header;
header.magic = JERRY_SNAPSHOT_MAGIC;
header.version = JERRY_SNAPSHOT_VERSION;
header.global_flags = snapshot_get_global_flags (globals.regex_found, globals.class_found);
header.lit_table_offset = (uint32_t) globals.snapshot_buffer_write_offset;
header.number_of_funcs = 1;
header.func_offsets[0] = aligned_header_size;
lit_mem_to_snapshot_id_map_entry_t *lit_map_p = NULL;
uint32_t literals_num = 0;
if (!(generate_snapshot_opts & JERRY_SNAPSHOT_SAVE_STATIC))
{
ecma_collection_t *lit_pool_p = ecma_new_collection ();
ecma_save_literals_add_compiled_code (bytecode_data_p, lit_pool_p);
if (!ecma_save_literals_for_snapshot (lit_pool_p,
buffer_p,
buffer_size,
&globals.snapshot_buffer_write_offset,
&lit_map_p,
&literals_num))
{
JERRY_ASSERT (lit_map_p == NULL);
return jerry_throw_sz (JERRY_ERROR_COMMON, ecma_get_error_msg (ECMA_ERR_CANNOT_ALLOCATE_MEMORY_LITERALS));
}
jerry_snapshot_set_offsets (buffer_p + (aligned_header_size / sizeof (uint32_t)),
(uint32_t) (header.lit_table_offset - aligned_header_size),
lit_map_p);
}
size_t header_offset = 0;
snapshot_write_to_buffer_by_offset ((uint8_t *) buffer_p, buffer_size, &header_offset, &header, sizeof (header));
if (lit_map_p != NULL)
{
jmem_heap_free_block (lit_map_p, literals_num * sizeof (lit_mem_to_snapshot_id_map_entry_t));
}
return ecma_make_number_value ((ecma_number_t) globals.snapshot_buffer_write_offset);
#else /* !JERRY_SNAPSHOT_SAVE */
JERRY_UNUSED (compiled_code);
JERRY_UNUSED (generate_snapshot_opts);
JERRY_UNUSED (buffer_p);
JERRY_UNUSED (buffer_size);
return jerry_throw_sz (JERRY_ERROR_COMMON, ecma_get_error_msg (ECMA_ERR_SNAPSHOT_SAVE_DISABLED));
#endif /* JERRY_SNAPSHOT_SAVE */
} /* jerry_generate_snapshot */
/**
* Execute/load snapshot from specified buffer
*
* Note:
* returned value must be freed with jerry_value_free, when it is no longer needed.
*
* @return result of bytecode - if run was successful
* thrown error - otherwise
*/
jerry_value_t
jerry_exec_snapshot (const uint32_t *snapshot_p, /**< snapshot */
size_t snapshot_size, /**< size of snapshot */
size_t func_index, /**< index of primary function */
uint32_t exec_snapshot_opts, /**< jerry_exec_snapshot_opts_t option bits */
const jerry_exec_snapshot_option_values_t *option_values_p) /**< additional option values,
* can be NULL if not used */
{
#if JERRY_SNAPSHOT_EXEC
JERRY_ASSERT (snapshot_p != NULL);
uint32_t allowed_opts =
(JERRY_SNAPSHOT_EXEC_COPY_DATA | JERRY_SNAPSHOT_EXEC_ALLOW_STATIC | JERRY_SNAPSHOT_EXEC_LOAD_AS_FUNCTION
| JERRY_SNAPSHOT_EXEC_HAS_SOURCE_NAME | JERRY_SNAPSHOT_EXEC_HAS_USER_VALUE);
if ((exec_snapshot_opts & ~(allowed_opts)) != 0)
{
return jerry_throw_sz (JERRY_ERROR_RANGE,
ecma_get_error_msg (ECMA_ERR_UNSUPPORTED_SNAPSHOT_EXEC_FLAGS_ARE_SPECIFIED));
}
const uint8_t *snapshot_data_p = (uint8_t *) snapshot_p;
if (snapshot_size <= sizeof (jerry_snapshot_header_t))
{
return jerry_throw_sz (JERRY_ERROR_TYPE, ecma_get_error_msg (ECMA_ERR_INVALID_SNAPSHOT_FORMAT));
}
const jerry_snapshot_header_t *header_p = (const jerry_snapshot_header_t *) snapshot_data_p;
if (header_p->magic != JERRY_SNAPSHOT_MAGIC || header_p->version != JERRY_SNAPSHOT_VERSION
|| !snapshot_check_global_flags (header_p->global_flags))
{
return jerry_throw_sz (JERRY_ERROR_TYPE, ecma_get_error_msg (ECMA_ERR_INVALID_SNAPSHOT_VERSION_OR_FEATURES));
}
if (header_p->lit_table_offset > snapshot_size)
{
return jerry_throw_sz (JERRY_ERROR_TYPE, ecma_get_error_msg (ECMA_ERR_INVALID_SNAPSHOT_VERSION_OR_FEATURES));
}
if (func_index >= header_p->number_of_funcs)
{
return jerry_throw_sz (JERRY_ERROR_TYPE, ecma_get_error_msg (ECMA_ERR_FUNCTION_INDEX_IS_HIGHER_THAN_MAXIMUM));
}
JERRY_ASSERT ((header_p->lit_table_offset % sizeof (uint32_t)) == 0);
uint32_t func_offset = header_p->func_offsets[func_index];
ecma_compiled_code_t *bytecode_p = (ecma_compiled_code_t *) (snapshot_data_p + func_offset);
if (bytecode_p->status_flags & CBC_CODE_FLAGS_STATIC_FUNCTION)
{
if (!(exec_snapshot_opts & JERRY_SNAPSHOT_EXEC_ALLOW_STATIC))
{
return jerry_throw_sz (JERRY_ERROR_COMMON, ecma_get_error_msg (ECMA_ERR_STATIC_SNAPSHOTS_ARE_NOT_ENABLED));
}
if (exec_snapshot_opts & JERRY_SNAPSHOT_EXEC_COPY_DATA)
{
return jerry_throw_sz (JERRY_ERROR_COMMON,
ecma_get_error_msg (ECMA_ERR_STATIC_SNAPSHOTS_CANNOT_BE_COPIED_INTO_MEMORY));
}
}
else
{
ecma_value_t user_value = ECMA_VALUE_EMPTY;
if ((exec_snapshot_opts & JERRY_SNAPSHOT_EXEC_HAS_USER_VALUE) && option_values_p != NULL)
{
user_value = option_values_p->user_value;
}
size_t script_size = sizeof (cbc_script_t);
if (user_value != ECMA_VALUE_EMPTY)
{
script_size += sizeof (ecma_value_t);
}
cbc_script_t *script_p = jmem_heap_alloc_block (script_size);
CBC_SCRIPT_SET_TYPE (script_p, user_value, CBC_SCRIPT_REF_ONE);
#if JERRY_BUILTIN_REALMS
script_p->realm_p = (ecma_object_t *) JERRY_CONTEXT (global_object_p);
#endif /* JERRY_BUILTIN_REALMS */
#if JERRY_SOURCE_NAME
ecma_value_t source_name = ecma_make_magic_string_value (LIT_MAGIC_STRING_SOURCE_NAME_ANON);
if ((exec_snapshot_opts & JERRY_SNAPSHOT_EXEC_HAS_SOURCE_NAME) && option_values_p != NULL
&& ecma_is_value_string (option_values_p->source_name) > 0)
{
ecma_ref_ecma_string (ecma_get_string_from_value (option_values_p->source_name));
source_name = option_values_p->source_name;
}
script_p->source_name = source_name;
#endif /* JERRY_SOURCE_NAME */
#if JERRY_FUNCTION_TO_STRING
script_p->source_code = ecma_make_magic_string_value (LIT_MAGIC_STRING__EMPTY);
#endif /* JERRY_FUNCTION_TO_STRING */
const uint8_t *literal_base_p = snapshot_data_p + header_p->lit_table_offset;
bytecode_p = snapshot_load_compiled_code ((const uint8_t *) bytecode_p,
literal_base_p,
script_p,
(exec_snapshot_opts & JERRY_SNAPSHOT_EXEC_COPY_DATA) != 0);
if (bytecode_p == NULL)
{
JERRY_ASSERT (script_p->refs_and_type >= CBC_SCRIPT_REF_ONE);
jmem_heap_free_block (script_p, script_size);
return ecma_raise_type_error (ECMA_ERR_INVALID_SNAPSHOT_FORMAT);
}
script_p->refs_and_type -= CBC_SCRIPT_REF_ONE;
if (user_value != ECMA_VALUE_EMPTY)
{
CBC_SCRIPT_GET_USER_VALUE (script_p) = ecma_copy_value_if_not_object (user_value);
}
}
#if JERRY_PARSER_DUMP_BYTE_CODE
if (JERRY_CONTEXT (jerry_init_flags) & JERRY_INIT_SHOW_OPCODES)
{
util_print_cbc (bytecode_p);
}
#endif /* JERRY_PARSER_DUMP_BYTE_CODE */
ecma_value_t ret_val;
if (exec_snapshot_opts & JERRY_SNAPSHOT_EXEC_LOAD_AS_FUNCTION)
{
ecma_object_t *global_object_p = ecma_builtin_get_global ();