--- /dev/null
+/*
+ * Ecmascript compiler.
+ */
+
+#ifndef DUK_JS_COMPILER_H_INCLUDED
+#define DUK_JS_COMPILER_H_INCLUDED
+
+/* ecmascript compiler limits */
+#define DUK_COMPILER_TOKEN_LIMIT 100000000L /* 1e8: protects against deeply nested inner functions */
+
+/* maximum loopcount for peephole optimization */
+#define DUK_COMPILER_PEEPHOLE_MAXITER 3
+
+/* maximum bytecode length in instructions */
+#define DUK_COMPILER_MAX_BYTECODE_LENGTH (256L * 1024L * 1024L) /* 1 GB */
+
+/*
+ * Compiler intermediate values
+ *
+ * Intermediate values describe either plain values (e.g. strings or
+ * numbers) or binary operations which have not yet been coerced into
+ * either a left-hand-side or right-hand-side role (e.g. object property).
+ */
+
+#define DUK_IVAL_NONE 0 /* no value */
+#define DUK_IVAL_PLAIN 1 /* register, constant, or value */
+#define DUK_IVAL_ARITH 2 /* binary arithmetic; DUK_OP_ADD, DUK_OP_EQ, other binary ops */
+#define DUK_IVAL_ARITH_EXTRAOP 3 /* binary arithmetic using extraops; DUK_EXTRAOP_INSTOF etc */
+#define DUK_IVAL_PROP 4 /* property access */
+#define DUK_IVAL_VAR 5 /* variable access */
+
+#define DUK_ISPEC_NONE 0 /* no value */
+#define DUK_ISPEC_VALUE 1 /* value resides in 'valstack_idx' */
+#define DUK_ISPEC_REGCONST 2 /* value resides in a register or constant */
+
+/* bit mask which indicates that a regconst is a constant instead of a register */
+#define DUK_JS_CONST_MARKER 0x80000000UL
+
+/* type to represent a reg/const reference during compilation */
+typedef duk_uint32_t duk_regconst_t;
+
+/* type to represent a straight register reference, with <0 indicating none */
+typedef duk_int32_t duk_reg_t;
+
+typedef struct {
+ duk_small_uint_t t; /* DUK_ISPEC_XXX */
+ duk_regconst_t regconst;
+ duk_idx_t valstack_idx; /* always set; points to a reserved valstack slot */
+} duk_ispec;
+
+typedef struct {
+ /*
+ * PLAIN: x1
+ * ARITH: x1 <op> x2
+ * PROP: x1.x2
+ * VAR: x1 (name)
+ */
+
+ /* XXX: can be optimized for smaller footprint esp. on 32-bit environments */
+ duk_small_uint_t t; /* DUK_IVAL_XXX */
+ duk_small_uint_t op; /* bytecode opcode (or extraop) for binary ops */
+ duk_ispec x1;
+ duk_ispec x2;
+} duk_ivalue;
+
+/*
+ * Bytecode instruction representation during compilation
+ *
+ * Contains the actual instruction and (optionally) debug info.
+ */
+
+struct duk_compiler_instr {
+ duk_instr_t ins;
+#if defined(DUK_USE_PC2LINE)
+ duk_uint32_t line;
+#endif
+};
+
+/*
+ * Compiler state
+ */
+
+#define DUK_LABEL_FLAG_ALLOW_BREAK (1 << 0)
+#define DUK_LABEL_FLAG_ALLOW_CONTINUE (1 << 1)
+
+#define DUK_DECL_TYPE_VAR 0
+#define DUK_DECL_TYPE_FUNC 1
+
+/* XXX: optimize to 16 bytes */
+typedef struct {
+ duk_small_uint_t flags;
+ duk_int_t label_id; /* numeric label_id (-1 reserved as marker) */
+ duk_hstring *h_label; /* borrowed label name */
+ duk_int_t catch_depth; /* catch depth at point of definition */
+ duk_int_t pc_label; /* pc of label statement:
+ * pc+1: break jump site
+ * pc+2: continue jump site
+ */
+
+ /* Fast jumps (which avoid longjmp) jump directly to the jump sites
+ * which are always known even while the iteration/switch statement
+ * is still being parsed. A final peephole pass "straightens out"
+ * the jumps.
+ */
+} duk_labelinfo;
+
+/* Compiling state of one function, eventually converted to duk_hcompiledfunction */
+struct duk_compiler_func {
+ /* These pointers are at the start of the struct so that they pack
+ * nicely. Mixing pointers and integer values is bad on some
+ * platforms (e.g. if int is 32 bits and pointers are 64 bits).
+ */
+
+ duk_bufwriter_ctx bw_code; /* bufwriter for code */
+
+ duk_hstring *h_name; /* function name (borrowed reference), ends up in _name */
+ /* h_code: held in bw_code */
+ duk_hobject *h_consts; /* array */
+ duk_hobject *h_funcs; /* array of function templates: [func1, offset1, line1, func2, offset2, line2]
+ * offset/line points to closing brace to allow skipping on pass 2
+ */
+ duk_hobject *h_decls; /* array of declarations: [ name1, val1, name2, val2, ... ]
+ * valN = (typeN) | (fnum << 8), where fnum is inner func number (0 for vars)
+ * record function and variable declarations in pass 1
+ */
+ duk_hobject *h_labelnames; /* array of active label names */
+ duk_hbuffer_dynamic *h_labelinfos; /* C array of duk_labelinfo */
+ duk_hobject *h_argnames; /* array of formal argument names (-> _Formals) */
+ duk_hobject *h_varmap; /* variable map for pass 2 (identifier -> register number or null (unmapped)) */
+
+ /* value stack indices for tracking objects */
+ /* code_idx: not needed */
+ duk_idx_t consts_idx;
+ duk_idx_t funcs_idx;
+ duk_idx_t decls_idx;
+ duk_idx_t labelnames_idx;
+ duk_idx_t labelinfos_idx;
+ duk_idx_t argnames_idx;
+ duk_idx_t varmap_idx;
+
+ /* temp reg handling */
+ duk_reg_t temp_first; /* first register that is a temporary (below: variables) */
+ duk_reg_t temp_next; /* next temporary register to allocate */
+ duk_reg_t temp_max; /* highest value of temp_reg (temp_max - 1 is highest used reg) */
+
+ /* shuffle registers if large number of regs/consts */
+ duk_reg_t shuffle1;
+ duk_reg_t shuffle2;
+ duk_reg_t shuffle3;
+
+ /* stats for current expression being parsed */
+ duk_int_t nud_count;
+ duk_int_t led_count;
+ duk_int_t paren_level; /* parenthesis count, 0 = top level */
+ duk_bool_t expr_lhs; /* expression is left-hand-side compatible */
+ duk_bool_t allow_in; /* current paren level allows 'in' token */
+
+ /* misc */
+ duk_int_t stmt_next; /* statement id allocation (running counter) */
+ duk_int_t label_next; /* label id allocation (running counter) */
+ duk_int_t catch_depth; /* catch stack depth */
+ duk_int_t with_depth; /* with stack depth (affects identifier lookups) */
+ duk_int_t fnum_next; /* inner function numbering */
+ duk_int_t num_formals; /* number of formal arguments */
+ duk_reg_t reg_stmt_value; /* register for writing value of 'non-empty' statements (global or eval code), -1 is marker */
+#if defined(DUK_USE_DEBUGGER_SUPPORT)
+ duk_int_t min_line; /* XXX: typing (duk_hcompiledfunction has duk_uint32_t) */
+ duk_int_t max_line;
+#endif
+
+ /* status booleans */
+ duk_bool_t is_function; /* is an actual function (not global/eval code) */
+ duk_bool_t is_eval; /* is eval code */
+ duk_bool_t is_global; /* is global code */
+ duk_bool_t is_setget; /* is a setter/getter */
+ duk_bool_t is_decl; /* is a function declaration (as opposed to function expression) */
+ duk_bool_t is_strict; /* function is strict */
+ duk_bool_t is_notail; /* function must not be tail called */
+ duk_bool_t in_directive_prologue; /* parsing in "directive prologue", recognize directives */
+ duk_bool_t in_scanning; /* parsing in "scanning" phase (first pass) */
+ duk_bool_t may_direct_eval; /* function may call direct eval */
+ duk_bool_t id_access_arguments; /* function refers to 'arguments' identifier */
+ duk_bool_t id_access_slow; /* function makes one or more slow path accesses */
+ duk_bool_t is_arguments_shadowed; /* argument/function declaration shadows 'arguments' */
+ duk_bool_t needs_shuffle; /* function needs shuffle registers */
+ duk_bool_t reject_regexp_in_adv; /* reject RegExp literal on next advance() call; needed for handling IdentifierName productions */
+};
+
+struct duk_compiler_ctx {
+ duk_hthread *thr;
+
+ /* filename being compiled (ends up in functions' '_filename' property) */
+ duk_hstring *h_filename; /* borrowed reference */
+
+ /* lexing (tokenization) state (contains two valstack slot indices) */
+ duk_lexer_ctx lex;
+
+ /* current and previous token for parsing */
+ duk_token prev_token;
+ duk_token curr_token;
+ duk_idx_t tok11_idx; /* curr_token slot1 (matches 'lex' slot1_idx) */
+ duk_idx_t tok12_idx; /* curr_token slot2 (matches 'lex' slot2_idx) */
+ duk_idx_t tok21_idx; /* prev_token slot1 */
+ duk_idx_t tok22_idx; /* prev_token slot2 */
+
+ /* recursion limit */
+ duk_int_t recursion_depth;
+ duk_int_t recursion_limit;
+
+ /* code emission temporary */
+ duk_int_t emit_jumpslot_pc;
+
+ /* current function being compiled (embedded instead of pointer for more compact access) */
+ duk_compiler_func curr_func;
+};
+
+/*
+ * Prototypes
+ */
+
+#define DUK_JS_COMPILE_FLAG_EVAL (1 << 0) /* source is eval code (not global) */
+#define DUK_JS_COMPILE_FLAG_STRICT (1 << 1) /* strict outer context */
+#define DUK_JS_COMPILE_FLAG_FUNCEXPR (1 << 2) /* source is a function expression (used for Function constructor) */
+
+DUK_INTERNAL_DECL void duk_js_compile(duk_hthread *thr, const duk_uint8_t *src_buffer, duk_size_t src_length, duk_small_uint_t flags);
+
+#endif /* DUK_JS_COMPILER_H_INCLUDED */
projects / ceph.git / blobdiff