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Rework the engine's internal recursion limit (#2969)

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This patch unifies the recursion limit checking for RegExp, function call and JSON as well.
Until now the limit was only a counter which was increased/decreased at certain points.
This counter has been substituted with a numeric limit which allows to restrict the stack usage.

This patch fixes #2963 and resolves the closed #2258 issue.

Co-authored-by: Gabor Loki loki@inf.u-szeged.hu
JerryScript-DCO-1.0-Signed-off-by: Robert Fancsik frobert@inf.u-szeged.hu
This commit is contained in:
Robert Fancsik
2019-07-23 15:31:37 +02:00
committed by GitHub
parent f53dba1a3a
commit 4a9e185840
20 changed files with 156 additions and 216 deletions
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jerry-core/parser/regexp/re-compiler.c
+1 -4
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@@ -246,7 +246,7 @@ static ecma_value_t
re_parse_alternative (re_compiler_ctx_t *re_ctx_p, /**< RegExp compiler context */
bool expect_eof) /**< expect end of file */
{
REGEXP_RECURSION_COUNTER_DECREASE_AND_TEST ();
ECMA_CHECK_STACK_USAGE ();
uint32_t idx;
re_bytecode_ctx_t *bc_ctx_p = re_ctx_p->bytecode_ctx_p;
ecma_value_t ret_value = ECMA_VALUE_EMPTY;
@@ -441,7 +441,6 @@ re_parse_alternative (re_compiler_ctx_t *re_ctx_p, /**< RegExp compiler context
else
{
re_insert_u32 (bc_ctx_p, alterantive_offset, re_get_bytecode_length (bc_ctx_p) - alterantive_offset);
REGEXP_RECURSION_COUNTER_INCREASE ();
should_loop = false;
}
break;
@@ -455,7 +454,6 @@ re_parse_alternative (re_compiler_ctx_t *re_ctx_p, /**< RegExp compiler context
else
{
re_insert_u32 (bc_ctx_p, alterantive_offset, re_get_bytecode_length (bc_ctx_p) - alterantive_offset);
REGEXP_RECURSION_COUNTER_INCREASE ();
should_loop = false;
}
@@ -562,7 +560,6 @@ re_compile_bytecode (const re_compiled_code_t **out_bytecode_p, /**< [out] point
re_ctx.flags = flags;
re_ctx.highest_backref = 0;
re_ctx.num_of_non_captures = 0;
REGEXP_RECURSION_COUNTER_INIT ();
re_bytecode_ctx_t bc_ctx;
bc_ctx.block_start_p = NULL;