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libjit/jit/jit-internal.h  view on Meta::CPAN

#define	JIT_INSN_DEST_IS_VALUE		0x1000

/*
 * Information about each label associated with a function.
 *
 * Multiple labels may belong to the same basic block. Such labels are
 * linked into list.
 */
typedef struct _jit_label_info _jit_label_info_t;
struct _jit_label_info
{
	/* Block the label assigned to */
	jit_block_t		block;

	/* Next label that might belong to the same block */
	jit_label_t		alias;

	/* Label flags */
	int			flags;
};

#define JIT_LABEL_ADDRESS_OF		0x0001


/*
 * Information that is associated with a function for building
 * the instructions and values.  This structure can be discarded
 * once the function has been fully compiled.
 */
typedef struct _jit_builder *jit_builder_t;
struct _jit_builder
{
	/* Entry point for the function (and the head of the block list) */
	jit_block_t		entry_block;

	/* Exit point for the function (and the tail of the block list) */
	jit_block_t		exit_block;

	/* The position to insert initialization blocks */
	jit_block_t		init_block;

	/* The current block that is being constructed */
	jit_block_t		current_block;

	/* The list of deleted blocks */
	jit_block_t		deleted_blocks;

	/* Blocks sorted in order required by an optimization pass */
	jit_block_t		*block_order;
	int			num_block_order;

	/* The next block label to be allocated */
	jit_label_t		next_label;

	/* Mapping from label numbers to blocks */
	_jit_label_info_t	*label_info;
	jit_label_t		max_label_info;

	/* Exception handling definitions for the function */
	jit_value_t		setjmp_value;
	jit_value_t		thrown_exception;
	jit_value_t		thrown_pc;
	jit_label_t		catcher_label;
	jit_value_t		eh_frame_info;

	/* Flag that is set to indicate that this function is not a leaf */
	unsigned		non_leaf : 1;

	/* Flag that indicates if we've seen code that may throw an exception */
	unsigned		may_throw : 1;

	/* Flag that indicates if the function has an ordinary return */
	unsigned		ordinary_return : 1;

	/* Flag that indicates that the current function contains a tail call */
	unsigned		has_tail_call : 1;

	/* Generate position-independent code */
	unsigned		position_independent : 1;

	/* Memory pools that contain values, instructions, and metadata blocks */
	jit_memory_pool		value_pool;
	jit_memory_pool		edge_pool;
	jit_memory_pool		meta_pool;

	/* Common constants that have been cached */
	jit_value_t		null_constant;
	jit_value_t		zero_constant;

	/* The values for the parameters, structure return, and parent frame */
	jit_value_t		*param_values;
	jit_value_t		struct_return;
	jit_value_t		parent_frame;

	/* Metadata that is stored only while the function is being built */
	jit_meta_t		meta;

	/* Current size of the local variable frame (used by the back end) */
	jit_nint		frame_size;

	/* Number of stack items that are queued for a deferred pop */
	jit_nint		deferred_items;

	/* Size of the outgoing parameter area in the frame */
	jit_nint		param_area_size;

#ifdef _JIT_COMPILE_DEBUG
	int			block_count;
	int			insn_count;
#endif
};

/*
 * Internal structure of a function.
 */
struct _jit_function
{
	/* The context that the function is associated with */
	jit_context_t		context;
	jit_function_t		next;
	jit_function_t		prev;

	/* Containing function in a nested context */
	jit_function_t		nested_parent;

	/* Metadata that survives once the builder is discarded */
	jit_meta_t		meta;

	/* The signature for this function */
	jit_type_t		signature;

	/* The builder information for this function */
	jit_builder_t		builder;

	/* Debug information for this function */
	jit_varint_data_t	bytecode_offset;

	/* Cookie value for this function */
	void			*cookie;

	/* Flag bits for this function */
	unsigned		is_recompilable : 1;
	unsigned		is_optimized : 1;
	unsigned		no_throw : 1;
	unsigned		no_return : 1;
	unsigned		has_try : 1;
	unsigned		optimization_level : 8;

	/* Flag set once the function is compiled */
	int volatile		is_compiled;

	/* The entry point for the function's compiled code */
	void * volatile		entry_point;

	/* The function to call to perform on-demand compilation */
	jit_on_demand_func	on_demand;

#ifndef JIT_BACKEND_INTERP
# ifdef jit_redirector_size
	/* Buffer that contains the redirector for this function.
	   Redirectors are used to support on-demand compilation */
	unsigned char		*redirector;
# endif

	/* Buffer that contains the indirector for this function.
	   The indirector jumps to the address that is currently
	   stored in the entry_point field. Indirectors are used
	   to support recompilation and on-demand compilation. */
	unsigned char		*indirector;
#endif
};

/*
 * Ensure that there is a builder associated with a function.
 */
int _jit_function_ensure_builder(jit_function_t func);

/*
 * Free the builder associated with a function.
 */
void _jit_function_free_builder(jit_function_t func);

/*
 * Destroy all memory associated with a function.
 */
void _jit_function_destroy(jit_function_t func);

/*
 * Compute value liveness and "next use" information for a function.
 */
void _jit_function_compute_liveness(jit_function_t func);

/*
 * Compile a function on-demand.  Returns the entry point.
 */
void *_jit_function_compile_on_demand(jit_function_t func);

/*
 * Get the bytecode offset that is associated with a native
 * offset within a method.  Returns JIT_CACHE_NO_OFFSET
 * if the bytecode offset could not be determined.
 */
unsigned long _jit_function_get_bytecode(jit_function_t func, void *func_info, void *pc, int exact);