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ivl_target.h
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ivl_target.h
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#ifndef __ivl_target_H
#define __ivl_target_H
/*
* Copyright (c) 2000-2003 Stephen Williams (steve@icarus.com)
*
* This source code is free software; you can redistribute it
* and/or modify it in source code form under the terms of the GNU
* General Public License as published by the Free Software
* Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#ifdef HAVE_CVS_IDENT
#ident "$Id: ivl_target.h,v 1.126.2.5 2006/04/16 19:26:37 steve Exp $"
#endif
#ifdef __cplusplus
#define _BEGIN_DECL extern "C" {
#define _END_DECL }
#else
#define _BEGIN_DECL
#define _END_DECL
#endif
_BEGIN_DECL
/*
* This header file describes the API for the loadable target
* module. The main program can load these modules and access the
* functions within the loaded module to implement the backend
* behavior.
*
* The interface is divided into two parts: the entry points within
* the core that are called by the module, and the entry points in
* the module that are called by the core. It is the latter that
* causes the module to be invoked in the first place, but most of the
* interesting information about the design is accessed through the
* various access functions that the modules calls into the core.
*/
/*
* In order to grab onto data in the design, the core passes cookies
* to the various functions of the module. These cookies can in turn
* be passed to access functions in the core to get more detailed
* information.
*
* The following typedefs list the various cookies that may be passed
* around.
*
* ivl_design_t
* This object represents the entire elaborated design. Various
* global properties and methods are available from this.
*
* ivl_event_t
* This object represents an event node. An event node stands for
* named events written explicitly in the Verilog, and net events
* that are implicit when @ statements are used.
*
* ivl_expr_t
* This object represents a node of an expression. If the
* expression has sub-expressions, they can be accessed from
* various method described below. The ivl_expr_type method in
* particular gets the type of the node in the form of an
* ivl_expr_type_t enumeration value.
*
* Objects of this type represent expressions in
* processes. Structural expressions are instead treated as logic
* gates.
*
* ivl_lpm_t
* This object is the base class for all the various LPM type
* device nodes. This object carries a few base properties
* (including a type) including a handle to the specific type.
*
* ivl_net_logic_t
* This object represents various built in logic devices. In fact,
* this includes just about every directional device that has a
* single output, including logic gates and nmos, pmos and cmos
* devices. There is also the occasional Icarus Verilog creation.
*
* ivl_nexus_t
* Structural links within an elaborated design are connected
* together at each bit. The connection point is a nexus, so pins
* of devices refer to an ivl_nexus_t. Furthermore, from a nexus
* there are backward references to all the device pins that point
* to it.
*
* ivl_parameter_t
* Scopes have zero or more parameter objects that represent
* parameters that the source defined. The parameter has a value
* that is fully elaborated, with defparams and other parameter
* overrides taken care of.
*
* ivl_process_t
* A Verilog process is represented by one of these. A process may
* be an "initial" or an "always" process. These come from initial
* or always statements from the Verilog source.
*
* ivl_scope_t
* Elaborated scopes within a design are represented by this
* type. Objects of this type also act as containers for scoped
* objects such as signals.
*
* ivl_statement_t
* Statements within processes are represented by one of these. The
* ivl_process_t object holds one of these, but a statement may in
* turn contain other statements.
*
* -- A Note About Bit Sets --
* Some objects hold a value as an array of bits. In these cases there
* is some method that retrieves the width of the value and another
* that returns a "char*". The latter is a pointer to the least
* significant bit value. Bit values are represented by the characters
* '0', '1', 'x' and 'z'. Strengths are stored elsewhere.
*
* -- A Note About Names --
* The names of objects are complete, hierarchical names. That is,
* they include the instance name of the module that contains them.
*
* basenames are the name of the object without the containing
* scope. These names are unique within a scope, but not necessarily
* throughout the design.
*/
typedef struct ivl_design_s *ivl_design_t;
typedef struct ivl_event_s *ivl_event_t;
typedef struct ivl_expr_s *ivl_expr_t;
typedef struct ivl_lpm_s *ivl_lpm_t;
typedef struct ivl_lval_s *ivl_lval_t;
typedef struct ivl_net_const_s*ivl_net_const_t;
typedef struct ivl_net_logic_s*ivl_net_logic_t;
typedef struct ivl_udp_s *ivl_udp_t;
typedef struct ivl_net_probe_s*ivl_net_probe_t;
typedef struct ivl_nexus_s *ivl_nexus_t;
typedef struct ivl_nexus_ptr_s*ivl_nexus_ptr_t;
typedef struct ivl_parameter_s*ivl_parameter_t;
typedef struct ivl_process_s *ivl_process_t;
typedef struct ivl_scope_s *ivl_scope_t;
typedef struct ivl_signal_s *ivl_signal_t;
typedef struct ivl_memory_s *ivl_memory_t;
typedef struct ivl_statement_s*ivl_statement_t;
typedef struct ivl_variable_s *ivl_variable_t;
/*
* These are types that are defined as enumerations. These have
* explicit values so that the binary API is a bit more resilient to
* changes and additions to the enumerations.
*/
typedef enum ivl_drive_e {
IVL_DR_HiZ = 0,
IVL_DR_SMALL = 1,
IVL_DR_MEDIUM = 2,
IVL_DR_WEAK = 3,
IVL_DR_LARGE = 4,
IVL_DR_PULL = 5,
IVL_DR_STRONG = 6,
IVL_DR_SUPPLY = 7
} ivl_drive_t;
/* This is the type of an ivl_expr_t object. The explicit numbers
allow additions to the enumeration without causing values to shift
and incompatibilities to be introduced. */
typedef enum ivl_expr_type_e {
IVL_EX_NONE = 0,
IVL_EX_BITSEL = 1,
IVL_EX_BINARY = 2,
IVL_EX_CONCAT = 3,
IVL_EX_EVENT = 17,
IVL_EX_MEMORY = 4,
IVL_EX_NUMBER = 5,
IVL_EX_SCOPE = 6,
IVL_EX_SELECT = 7,
IVL_EX_SFUNC = 8,
IVL_EX_SIGNAL = 9,
IVL_EX_STRING = 10,
IVL_EX_TERNARY = 11,
IVL_EX_UFUNC = 12,
IVL_EX_ULONG = 13,
IVL_EX_UNARY = 14,
IVL_EX_VARIABLE = 15,
IVL_EX_REALNUM = 16
} ivl_expr_type_t;
/* This is the type code for an ivl_net_logic_t object. */
typedef enum ivl_logic_e {
IVL_LO_NONE = 0,
IVL_LO_AND = 1,
IVL_LO_BUF = 2,
IVL_LO_BUFIF0 = 3,
IVL_LO_BUFIF1 = 4,
IVL_LO_BUFZ = 5,
IVL_LO_NAND = 6,
IVL_LO_NMOS = 7,
IVL_LO_NOR = 8,
IVL_LO_NOT = 9,
IVL_LO_NOTIF0 = 10,
IVL_LO_NOTIF1 = 11,
IVL_LO_OR = 12,
IVL_LO_PULLDOWN = 13,
IVL_LO_PULLUP = 14,
IVL_LO_RNMOS = 15,
IVL_LO_RPMOS = 16,
IVL_LO_PMOS = 17,
IVL_LO_XNOR = 18,
IVL_LO_XOR = 19,
IVL_LO_EEQ = 20,
IVL_LO_UDP = 21
} ivl_logic_t;
/* This is the type of an LPM object. */
typedef enum ivl_lpm_type_e {
IVL_LPM_ADD = 0,
IVL_LPM_CMP_EQ = 10,
IVL_LPM_CMP_GE = 1,
IVL_LPM_CMP_GT = 2,
IVL_LPM_CMP_NE = 11,
IVL_LPM_DECODE = 15,
IVL_LPM_DEMUX = 16,
IVL_LPM_DIVIDE = 12,
IVL_LPM_FF = 3,
IVL_LPM_LATCH = 17,
IVL_LPM_MOD = 13,
IVL_LPM_MULT = 4,
IVL_LPM_MUX = 5,
IVL_LPM_SHIFTL = 6,
IVL_LPM_SHIFTR = 7,
IVL_LPM_SUB = 8,
IVL_LPM_RAM = 9,
IVL_LPM_UFUNC = 14
} ivl_lpm_type_t;
/* Processes are initial or always blocks with a statement. This is
the type of the ivl_process_t object. */
typedef enum ivl_process_type_e {
IVL_PR_INITIAL = 0,
IVL_PR_ALWAYS = 1
} ivl_process_type_t;
/* These are the sorts of reasons a scope may come to be. These types
are properties of ivl_scope_t objects. */
typedef enum ivl_scope_type_e {
IVL_SCT_MODULE = 0,
IVL_SCT_FUNCTION= 1,
IVL_SCT_TASK = 2,
IVL_SCT_BEGIN = 3,
IVL_SCT_FORK = 4
} ivl_scope_type_t;
/* Signals (ivl_signal_t) that are ports into the scope that contains
them have a port type. Otherwise, they are port IVL_SIP_NONE. */
typedef enum ivl_signal_port_e {
IVL_SIP_NONE = 0,
IVL_SIP_INPUT = 1,
IVL_SIP_OUTPUT= 2,
IVL_SIP_INOUT = 3
} ivl_signal_port_t;
/* This is the type code for an ivl_signal_t object. Implicit types
are resolved by the core compiler, and integers are converted into
signed registers. */
typedef enum ivl_signal_type_e {
IVL_SIT_NONE = 0,
IVL_SIT_REG,
IVL_SIT_SUPPLY0,
IVL_SIT_SUPPLY1,
IVL_SIT_TRI,
IVL_SIT_TRI0,
IVL_SIT_TRI1,
IVL_SIT_TRIAND,
IVL_SIT_TRIOR
} ivl_signal_type_t;
/* This is the type code for ivl_statement_t objects. */
typedef enum ivl_statement_type_e {
IVL_ST_NONE = 0,
IVL_ST_NOOP = 1,
IVL_ST_ASSIGN = 2,
IVL_ST_ASSIGN_NB = 3,
IVL_ST_BLOCK = 4,
IVL_ST_CASE = 5,
IVL_ST_CASER = 24, /* Case statement with real expressions. */
IVL_ST_CASEX = 6,
IVL_ST_CASEZ = 7,
IVL_ST_CASSIGN = 8,
IVL_ST_CONDIT = 9,
IVL_ST_DEASSIGN = 10,
IVL_ST_DELAY = 11,
IVL_ST_DELAYX = 12,
IVL_ST_DISABLE = 13,
IVL_ST_FORCE = 14,
IVL_ST_FOREVER = 15,
IVL_ST_FORK = 16,
IVL_ST_RELEASE = 17,
IVL_ST_REPEAT = 18,
IVL_ST_STASK = 19,
IVL_ST_TRIGGER = 20,
IVL_ST_UTASK = 21,
IVL_ST_WAIT = 22,
IVL_ST_WHILE = 23
} ivl_statement_type_t;
/* This is the type of a variable, and also used as the type for an
expression. */
typedef enum ivl_variable_type_e {
IVL_VT_VOID = 0, /* Not used */
IVL_VT_REAL,
IVL_VT_VECTOR
} ivl_variable_type_t;
/* This is the type of the function to apply to a process. */
typedef int (*ivl_process_f)(ivl_process_t net, void*cd);
/* This is the type of a function to apply to a scope. The ivl_scope_t
parameter is the scope, and the cd parameter is client data that
the user passes to the scanner. */
typedef int (ivl_scope_f)(ivl_scope_t net, void*cd);
/* Attributes, which can be attached to various object types, have
this form. */
typedef enum ivl_attribute_type_e {
IVL_ATT_VOID = 0,
IVL_ATT_STR,
IVL_ATT_NUM
} ivl_attribute_type_t;
struct ivl_attribute_s {
const char*key;
ivl_attribute_type_t type;
union val_ {
const char*str;
long num;
} val;
};
typedef const struct ivl_attribute_s*ivl_attribute_t;
/* DESIGN
* When handed a design (ivl_design_t) there are a few things that you
* can do with it. The Verilog program has one design that carries the
* entire program. Use the design methods to iterate over the elements
* of the design.
*
* ivl_design_flag
* This function returns the string value of a named flag. Flags
* come from the "-fkey=value" options to the iverilog command and
* are stored in a map for this function. Given the key, this
* function returns the value.
*
* The special key "-o" is the argument to the -o flag of the
* command line (or the default if the -o flag is not used) and is
* generally how the target learns the name of the output file.
*
* ivl_design_process
* This function scans the processes (threads) in the design. It
* calls the user supplied function on each of the processes until
* one of the functors returns non-0 or all the processes are
* scanned. This function will return 0, or the non-zero value that
* was returned from the last scanned process.
*
* ivl_design_root
* A design has a root named scope that is an instance of the top
* level module in the design. This is a hook for naming the
* design, or for starting the scope scan.
*
* ivl_design_time_precision
* A design as a time precision. This is the size in seconds (a
* signed power of 10) of a simulation tick.
*/
extern const char* ivl_design_flag(ivl_design_t des, const char*key);
extern int ivl_design_process(ivl_design_t des,
ivl_process_f fun, void*cd);
extern ivl_scope_t ivl_design_root(ivl_design_t des);
extern void ivl_design_roots(ivl_design_t des,
ivl_scope_t **scopes,
unsigned int *nscopes);
extern int ivl_design_time_precision(ivl_design_t des);
extern unsigned ivl_design_consts(ivl_design_t des);
extern ivl_net_const_t ivl_design_const(ivl_design_t, unsigned idx);
/*
* These methods apply to ivl_net_const_t objects.
*/
extern const char* ivl_const_bits(ivl_net_const_t net);
extern ivl_nexus_t ivl_const_pin(ivl_net_const_t net, unsigned idx);
extern unsigned ivl_const_pins(ivl_net_const_t net);
extern int ivl_const_signed(ivl_net_const_t net);
/* EVENTS
*
* Events are a unification of named events and implicit events
* generated by the @ statements.
*
* ivl_event_name (Obsolete)
* ivl_event_basename
* Return the name of the event. The basename is the name within
* the scope, as declared by the user.
*
* ivl_event_edge
* Return the edge type for the event. If this is a named event
* that has no network input, then the edge is IVL_EDGE_NONE.
*/
extern const char* ivl_event_name(ivl_event_t net);
extern const char* ivl_event_basename(ivl_event_t net);
extern unsigned ivl_event_nany(ivl_event_t net);
extern ivl_nexus_t ivl_event_any(ivl_event_t net, unsigned idx);
extern unsigned ivl_event_nneg(ivl_event_t net);
extern ivl_nexus_t ivl_event_neg(ivl_event_t net, unsigned idx);
extern unsigned ivl_event_npos(ivl_event_t net);
extern ivl_nexus_t ivl_event_pos(ivl_event_t net, unsigned idx);
/* EXPRESSIONS
*
* These methods operate on expression objects from the
* design. Expressions mainly exist in behavioral code. The
* ivl_expr_type() function returns the type of the expression node,
* and the remaining functions access value bits of the expression.
*
* ivl_expr_signed
* This method returns true (!= 0) if the expression node
* represents a signed expression. It is possible for sub-
* expressions to be unsigned even if a node is signed, but the
* IVL core figures all this out for you. At any rate, this method
* can be applied to any expression node.
*
* ivl_expr_type
* Get the type of the expression node. Every expression node has a
* type, which can affect how some of the other expression methods
* operate on the node
*
* ivl_expr_value
* Get the data type of the expression node. This uses the variable
* type enum to express the type of the expression node.
*
* ivl_expr_width
* This method returns the bit width of the expression at this
* node. It can be applied to any expression node, and returns the
* *output* width of the expression node.
*
* ivl_expr_parameter
* This function returns the ivl_parameter_t object that represents
* this object, or 0 (nil) if it is not a parameter value. This
* function allows the code generator to detect the case where the
* expression is a parameter. This will normally only return a
* non-nil value for constants.
*
* ivl_expr_opcode
* IVL_EX_BINARY and IVL_EX_UNARY expression nodes include an
* opcode from this table:
* & -- AND
* A -- NAND (~&)
* X -- XNOR (~^)
*/
extern ivl_expr_type_t ivl_expr_type(ivl_expr_t net);
extern ivl_variable_type_t ivl_expr_value(ivl_expr_t net);
/* IVL_EX_NUMBER */
extern const char* ivl_expr_bits(ivl_expr_t net);
/* IVL_EX_UFUNC */
extern ivl_scope_t ivl_expr_def(ivl_expr_t net);
/* IVL_EX_REALNUM */
extern double ivl_expr_dvalue(ivl_expr_t net);
/* IVL_EX_SIGNAL */
extern unsigned ivl_expr_lsi(ivl_expr_t net);
/* IVL_EX_SIGNAL, IVL_EX_SFUNC, IVL_EX_VARIABLE */
extern const char* ivl_expr_name(ivl_expr_t net);
/* IVL_EX_BINARY IVL_EX_UNARY */
extern char ivl_expr_opcode(ivl_expr_t net);
/* IVL_EX_BINARY IVL_EX_BITSEL IVL_EX_UNARY, IVL_EX_MEMORY IVL_EX_TERNARY */
extern ivl_expr_t ivl_expr_oper1(ivl_expr_t net);
/* IVL_EX_BINARY IVL_EX_TERNARY */
extern ivl_expr_t ivl_expr_oper2(ivl_expr_t net);
/* IVL_EX_TERNARY */
extern ivl_expr_t ivl_expr_oper3(ivl_expr_t net);
/* and expression */
extern ivl_parameter_t ivl_expr_parameter(ivl_expr_t net);
/* IVL_EX_CONCAT IVL_EX_UFUNC */
extern ivl_expr_t ivl_expr_parm(ivl_expr_t net, unsigned idx);
/* IVL_EX_CONCAT IVL_EX_SFUNC IVL_EX_UFUNC */
extern unsigned ivl_expr_parms(ivl_expr_t net);
/* IVL_EX_CONCAT */
extern unsigned ivl_expr_repeat(ivl_expr_t net);
/* IVL_EX_EVENT */
extern ivl_event_t ivl_expr_event(ivl_expr_t net);
/* IVL_EX_SCOPE */
extern ivl_scope_t ivl_expr_scope(ivl_expr_t net);
/* IVL_EX_BITSEL */
extern ivl_signal_t ivl_expr_signal(ivl_expr_t net);
/* any expression */
extern int ivl_expr_signed(ivl_expr_t net);
/* IVL_EX_STRING */
extern const char* ivl_expr_string(ivl_expr_t net);
/* IVL_EX_ULONG */
extern unsigned long ivl_expr_uvalue(ivl_expr_t net);
/* IVL_EX_VARIABLE */
extern ivl_variable_t ivl_expr_variable(ivl_expr_t net);
/* any expression */
extern unsigned ivl_expr_width(ivl_expr_t net);
/*
* Memory.
*
* ivl_memory_name (DEPRECATED)
*
* ivl_memory_basename
* This returns the base name of the memory object. The base name
* does not include the name of the scopes that contains the object.
*
* ivl_memory_size
* ivl_memory_width
* These functions return the dimensions of the memory. The size is
* the number of words in the memory, and the width is the number
* of bits in each word.
*
* ivl_memory_scope
* This returns the scope that contains the memory.
*/
extern const char*ivl_memory_basename(ivl_memory_t net);
extern int ivl_memory_root(ivl_memory_t net);
extern ivl_scope_t ivl_memory_scope(ivl_memory_t net);
extern unsigned ivl_memory_size(ivl_memory_t net);
extern unsigned ivl_memory_width(ivl_memory_t net);
extern ivl_memory_t ivl_expr_memory(ivl_expr_t net);
/* LOGIC
* These types and functions support manipulation of logic gates. The
* ivl_logic_t enumeration identifies the various kinds of gates that
* the ivl_net_logic_t can represent. The various functions then
* provide access to the bits of information for a given logic device.
*
* ivl_logic_type
* This method returns the type of logic gate that the cookie
* represents.
*
* ivl_logic_name (obsolete)
* This method returns the complete name of the logic gate. Every
* gate has a complete name (that includes the scope) even if the
* Verilog source doesn't include one. The compiler will choose one
* if necessary.
*
* ivl_logic_basename
* This is the name of the gate without the scope part.
*
* ivl_logic_scope
* This is the scope that directly contains the logic device.
*
* ivl_logic_pins
* ivl_logic_pin
* Return the nexus for the pin. If two pins are connected
* together, then these values are the same. Use the nexus
* functions to find other pins that are connected to this nexus.
*
* ivl_logic_attr (obsolete)
* Return the value of a specific attribute, given the key name as
* a string. If the key is not defined, then return 0 (null).
*
* ivl_logic_attr_cnt
* ivl_logic_attr_val
* These support iterating over logic attributes. The _cnt method
* returns the number of attributes attached to the gate, and the
* ivl_logic_attr_val returns the value of the attribute.
*/
extern const char* ivl_logic_name(ivl_net_logic_t net);
extern const char* ivl_logic_basename(ivl_net_logic_t net);
extern ivl_scope_t ivl_logic_scope(ivl_net_logic_t net);
extern ivl_logic_t ivl_logic_type(ivl_net_logic_t net);
extern ivl_nexus_t ivl_logic_pin(ivl_net_logic_t net, unsigned pin);
extern unsigned ivl_logic_pins(ivl_net_logic_t net);
extern ivl_udp_t ivl_logic_udp(ivl_net_logic_t net);
extern unsigned ivl_logic_delay(ivl_net_logic_t net, unsigned transition);
/* DEPRECATED */
extern const char* ivl_logic_attr(ivl_net_logic_t net, const char*key);
extern unsigned ivl_logic_attr_cnt(ivl_net_logic_t net);
extern ivl_attribute_t ivl_logic_attr_val(ivl_net_logic_t net, unsigned idx);
/* UDP
*
*/
extern unsigned ivl_udp_sequ(ivl_udp_t net);
extern unsigned ivl_udp_nin(ivl_udp_t net);
extern unsigned ivl_udp_init(ivl_udp_t net);
extern const char* ivl_udp_row(ivl_udp_t net, unsigned idx);
extern unsigned ivl_udp_rows(ivl_udp_t net);
extern const char* ivl_udp_name(ivl_udp_t net);
/* LPM
* These functions support access to the properties of LPM
* devices. LPM devices are a variety of devices that handle more
* complex structural semantics.
*
* These are the functions that apply to all LPM devices:
*
* ivl_lpm_name (Obsolete)
* ivl_lpm_basename
* Return the name of the device. The name is the name of the
* device with the scope part, and the basename is without the scope.
*
* ivl_lpm_scope
* LPM devices exist within a scope. Return the scope that contains
* this device.
*
* ivl_lpm_type
* Return the ivl_lpm_type_t of the specific LPM device.
*
* ivl_lpm_width
* Return the width of the LPM device. What this means depends on
* the LPM type, but it generally has to do with the width of the
* output data path.
*
* ivl_lpm_attr_cnt
* ivl_lpm_attr_val
* These functions access attributes attached to LPM devices. These
* attributes may be explicit attributes collected from the Verilog
* source, or implicit attributes generated by the compiler.
*
* These functions apply to a subset of the LPM devices, or may have
* varying meaning depending on the device:
*
* ivl_lpm_data
* Return the input data nexus for device types that have a single
* input vector. This is also used to the get nexa of the first
* vector for devices that have more inputs.
*
* ivl_lpm_datab
* Return the input data nexus for device types that have a second
* input vector. For example, arithmetic devices are like this.
*
* ivl_lpm_decode
* Return the DECODER associated with this LPM_FF device. The
* decoder for a FF takes an input address and generates an enable
* input for no more then 1 bit (can be none) of the FF device.
*
* ivl_lpm_q
* Return the output data nexus for device types that have a single
* output vector. This is most devices, it turns out.
*
* ivl_lpm_selects
* This is the size of the select input for a LPM_MUX or LPM_DECODE
* device, or the address bus width of an LPM_RAM.
*
* ivl_lpm_signed
* Arithmetic LPM devices may be signed or unsigned if there is a
* distinction.
*
* ivl_lpm_size
* In addition to a width, some devices have a size. The size is
* often the number of inputs per out, i.e., the number of inputs
* per bit for a MUX.
*
* SEMANTIC NOTES:
*
* - IVL_LPM_FF
* The IVL_LPM_FF and IVL_LPM_DECODE devices are closely related. If
* the ivl_lpm_decode function returns a non-nil value, then the
* decoder represents an extra ENABLE-like input, where exactly <N>
* bits of the width of the FF is enabled. The ivl_lpm_width of the
* decoder defines <N>.
*
* The decoder inputs are the address that selects the FF to be
* enabled, and the ivl_lpm_selects for the decoder gives the width of
* the address. The address of the LSB of the memory, then, is the
* word width times the input address. For a simple l-value bit
* select, the word width <N> will be 1, and the address goes directly
* to the bit. Otherwise, <N>*address gets to the first bit of the word.
*
* The core compiler generates these attributes in certain cases:
*
* - ivl:clock_polarity
* If present, the string value can be "INVERT". That indicates
* that the clock is negedge sensitive instead of the default
* posedge sensitive.
*
* - IVL_LPM_RAM
* The IVL_LPM_RAM may also appear as a READ port for a FF array. In
* this case, the IVL_LPM_RAM device has an ivl_lpm_width that is the
* width of the word, and an ivl_lpm_size that is the number of words
* in the array. In effect, the IVL_LPM_RAM reorganizes a vector into
* an array of words. If this is happening, then the ivl_lpm_memory
* will return 0.
*
* The ivl_lpm_q function gets the output nexa of the read port. The
* "q" port has as many bits as the width. The ivl_lpm_data2 function
* gets the nexa of the input, with the sdx the word address and the
* idx the bit within the word.
*
* - IVL_LPM_DEMUX
* This device is a form of bit replacement. The device has a data bus
* width (ivl_lpm_width) and an address width. The Data outputs are
* ivl_lpm_q and have the data bus width. The ivl_lpm_data functions are
* inputs to the device. Normally, the device passes the data inputs
* through to the Q output.
*
* The IVL_LPM_DEMUX also has a size (ivl_lpm_size) which is the
* number of addressable units in the device. If the device is bit-
* addressable, then the size is the same as the width. I.e. if
* ivl_lpm_width == ivl_lpm_size, then the address selects a single
* bit. If ivl_lpm_width/ivl_lpm_size == 8, then the address selects
* words of 8 bits and there are ivl_lpm_size of them. The
* ivl_lpm_width will always be an exact multiple of
* ivl_lpm_size. This is slightly different from the meaning of width
* in memory ports, but reflects that the DEMUX manipulates fixed
* width ranges within a single vector.
*
* The ivl_lpm_select inputs address a bit of the device. The
* addressed bit is substituted by the replacement bit. This
* replacement bit comes from the ivl_lpm_datab(net,0) nexus.
*/
extern const char* ivl_lpm_name(ivl_lpm_t net); /* (Obsolete) */
extern const char* ivl_lpm_basename(ivl_lpm_t net);
extern ivl_scope_t ivl_lpm_scope(ivl_lpm_t net);
extern int ivl_lpm_signed(ivl_lpm_t net);
extern ivl_lpm_type_t ivl_lpm_type(ivl_lpm_t net);
extern unsigned ivl_lpm_width(ivl_lpm_t net);
extern unsigned ivl_lpm_attr_cnt(ivl_lpm_t net);
extern ivl_attribute_t ivl_lpm_attr_val(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_FF */
extern ivl_nexus_t ivl_lpm_async_clr(ivl_lpm_t net);
extern ivl_nexus_t ivl_lpm_async_set(ivl_lpm_t net);
extern ivl_expr_t ivl_lpm_aset_value(ivl_lpm_t net);
extern ivl_nexus_t ivl_lpm_sync_clr(ivl_lpm_t net);
extern ivl_nexus_t ivl_lpm_sync_set(ivl_lpm_t net);
extern ivl_expr_t ivl_lpm_sset_value(ivl_lpm_t net);
/* IVL_LPM_FF IVL_LPM_RAM */
extern ivl_nexus_t ivl_lpm_clk(ivl_lpm_t net);
/* IVL_LPM_FF */
extern ivl_lpm_t ivl_lpm_decode(ivl_lpm_t net);
/* IVL_LPM_UFUNC */
extern ivl_scope_t ivl_lpm_define(ivl_lpm_t net);
/* IVL_LPM_FF IVL_LPM_RAM */
extern ivl_nexus_t ivl_lpm_enable(ivl_lpm_t net);
/* IVL_LPM_ADD IVL_LPM_DEMUX IVL_LPM_FF IVL_LPM_MULT */
/* IVL_LPM_RAM IVL_LPM_SUB */
extern ivl_nexus_t ivl_lpm_data(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_ADD IVL_LPM_DEMUX IVL_LPM_MULT IVL_LPM_SUB */
/* IVL_LPM_MUX IVL_LPM_UFUNC */
extern ivl_nexus_t ivl_lpm_datab(ivl_lpm_t net, unsigned idx);
extern ivl_nexus_t ivl_lpm_data2(ivl_lpm_t net, unsigned sdx, unsigned idx);
/* IVL_LPM_UFUNC */
extern unsigned ivl_lpm_data2_width(ivl_lpm_t net, unsigned sdx);
/* IVL_LPM_ADD IVL_LPM_DEMUX IVL_LPM_FF IVL_LPM_MULT IVL_LPM_RAM IVL_LPM_SUB
IVL_LPM_UFUNC */
extern ivl_nexus_t ivl_lpm_q(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_MUX IVL_LPM_DECODE IVL_LPM_DEMUX IVL_LPM_RAM */
extern unsigned ivl_lpm_selects(ivl_lpm_t net);
/* IVL_LPM_MUX IVL_LPM_DECODE IVL_LPM_DEMUX IVL_LPM_RAM */
extern ivl_nexus_t ivl_lpm_select(ivl_lpm_t net, unsigned idx);
/* IVL_LPM_DEMUX, IVL_LPM_MUX, IVL_LPM_RAM */
extern unsigned ivl_lpm_size(ivl_lpm_t net);
/* IVL_LPM_RAM */
extern ivl_memory_t ivl_lpm_memory(ivl_lpm_t net);
/* LVAL
* The l-values of assignments are concatenation of ivl_lval_t
* objects. Each lvi_lval_t object is an assignment to a var or a
* memory, through a bit select, part select or word select.
*
* Var lvals are things like assignments to a part select or a bit
* select. Assignment to the whole variable is a special case of a
* part select, as is a bit select with a constant expression. The
* ivl_lval_pins statement returns the width of the part select for
* the lval. The ivl_lval_pin function returns the nexus to the N-th
* bit of the part select. The compiler takes care of positioning the
* part select so that ivl_lval_pin(net, 0) is the proper bit in the
* signal.
*
* ivl_lval_mux
* If the l-value includes a bit select expression, this method
* returns an ivl_expr_t that represents that
* expression. Otherwise, it returns 0.
*
* ivl_lval_mem
* If the l-value is a memory, this method returns an
* ivl_memory_t that represents that memory. Otherwise, it
* returns 0.
*
* ivl_lval_sig
* If the l-value is a variable, this method returns the signal
* object that is the target of the assign.
*
* ivl_lval_var
* If the l-value is a non-signal variable (i.e. a real) this
* method returns the ivl_variable_t object that represents it.
* If the lval is this sort of variable, then the part_off, idx and
* pin methods do not apply.
*
* ivl_lval_part_off
* The part select of the signal is based here. This is the
* canonical index of bit-0 of the part select.
*
* ivl_lval_idx
* If the l-value is a memory, this method returns an
* ivl_expr_t that represents the index expression. Otherwise, it
* returns 0.
*
* ivl_lval_pin
* Return an ivl_nexus_t for the connection of the ivl_lval_t.
*
* ivl_lval_pins
* Return the number of pins for this object.
*/
extern ivl_expr_t ivl_lval_mux(ivl_lval_t net);
extern ivl_expr_t ivl_lval_idx(ivl_lval_t net);
extern ivl_memory_t ivl_lval_mem(ivl_lval_t net);
extern ivl_variable_t ivl_lval_var(ivl_lval_t net);
extern unsigned ivl_lval_part_off(ivl_lval_t net);
extern unsigned ivl_lval_pins(ivl_lval_t net);
extern ivl_nexus_t ivl_lval_pin(ivl_lval_t net, unsigned idx);
extern ivl_signal_t ivl_lval_sig(ivl_lval_t net);
/* NEXUS
* connections of signals and nodes is handled by single-bit
* nexus. These functions manage the ivl_nexus_t object. They also
* manage the ivl_nexus_ptr_t objects that are closely related to the
* nexus.
*
* ivl_nexus_name
* Each nexus is given a name, typically derived from the signals
* connected to it, but completely made up if need be. The name of
* every nexus is unique.
*
* ivl_nexus_ptrs
* This function returns the number of pointers that are held by
* the nexus. It should always return at least 1. The pointer
* proper is accessed by index.
*
* ivl_nexus_ptr
* Return a nexus pointer given the nexus and an index.
*
* ivl_nexus_set_private
* ivl_nexus_get_private
* The target module often needs to associate data with a nexus for
* later use when the nexus is encountered associated with a
* device. These methods allow the code generator to store to or
* retrieve from a nexus a void* of private data. This pointer is
* guaranteed to be 0 before the target module is invoked.
*
* Once an ivl_nexus_ptr_t is selected by the ivl_nexus_ptr method,
* the properties of the pointer can be accessed by the following
* methods:
*
* ivl_nexus_ptr_pin
* This returns the pin number of the device where this nexus
* points. It is the bit within the signal or logic device that is
* connected to the nexus.
*
* If the target is an LPM device, then this value is zero, and it
* is up to the application to find the pin that refers to this
* nexus. The problem is that LPM devices do not have a pinout per
* se, the pins all have specific names.
*
* ivl_nexus_ptr_con
* If this is a pointer to a magic constant device, then this
* returns the net_const object.
*
* ivl_nexus_ptr_drive0
* ivl_nexus_ptr_drive1
* These are the 0 and 1 strength values for the devices. For most
* devices, these values are fixed by the description in the
* original source, with the default as IVL_DR_STRONG. For pins
* that are input only, drive0 and drive1 are both IVL_DR_HiZ.
*
* The strength of strength-aware devices (such as nmos devices)
* does not really matter, as long at the output is not
* IVL_DR_HiZ. Testing for HiZ drivers is how code generators
* detect inputs.
*
* ivl_nexus_ptr_log
* If the target object is an ivl_net_logic_t, this method returns
* the object. Otherwise, this method returns 0.
*
* ivl_nexus_ptr_lpm
* If the target object is an ivl_lpm_t, this method returns the
* object. Otherwise, this method returns 0.
*
* ivl_nexus_ptr_sig
* If the target object is an ivl_signal_t, this method returns the
* object. If the target is not a signal, this method returns 0.
*/
extern const char* ivl_nexus_name(ivl_nexus_t net);
extern unsigned ivl_nexus_ptrs(ivl_nexus_t net);
extern ivl_nexus_ptr_t ivl_nexus_ptr(ivl_nexus_t net, unsigned idx);
extern void ivl_nexus_set_private(ivl_nexus_t net, void*data);
extern void* ivl_nexus_get_private(ivl_nexus_t net);
extern ivl_drive_t ivl_nexus_ptr_drive0(ivl_nexus_ptr_t net);
extern ivl_drive_t ivl_nexus_ptr_drive1(ivl_nexus_ptr_t net);
extern unsigned ivl_nexus_ptr_pin(ivl_nexus_ptr_t net);
extern ivl_net_const_t ivl_nexus_ptr_con(ivl_nexus_ptr_t net);
extern ivl_net_logic_t ivl_nexus_ptr_log(ivl_nexus_ptr_t net);
extern ivl_lpm_t ivl_nexus_ptr_lpm(ivl_nexus_ptr_t net);
extern ivl_signal_t ivl_nexus_ptr_sig(ivl_nexus_ptr_t net);
/* PARAMETER
* Parameters are named constants associated with a scope. The user
* may set in the Verilog source the value of parameters, and that
* leads to ivl_parameter_t objects contained in the ivl_scope_t
* objects.
*
* Parameters are essentially named constants. These constant values
* can be accessed by looking at the scope (using ivl_scope_param) or
* they can be discovered when they are used, via the
* ivl_expr_parameter function. The fact that a constant has a name
* (i.e. is a parameter) does not otherwise impose on the value or
* interpretation of the constant expression so far as ivl_target is
* concerned. The target may need this information, or may choose to
* completely ignore it.
*
* ivl_parameter_basename
* return the name of the parameter.
*
* ivl_parameter_scope
* Return the scope of the parameter. The parameter name is only
* unique within its scope.
*
* ivl_parameter_expr
* Return the value of the parameter. This should be a simple
* constant expression, an IVL_EX_STRING or IVL_EX_NUMBER.
*/
extern const char* ivl_parameter_basename(ivl_parameter_t net);
extern ivl_scope_t ivl_parameter_scope(ivl_parameter_t net);
extern ivl_expr_t ivl_parameter_expr(ivl_parameter_t net);
/* SCOPE
* Scopes of various sort have these properties. Use these methods to
* access them. Scopes come to exist in the elaborated design
* generally when a module is instantiated, though they also come from
* named blocks, tasks and functions.
*
* - module instances (IVL_SCT_MODULE)
* A module instance scope may contain events, logic gates, lpm
* nodes, signals, and possibly children. The children are further
* instances, or function/task scopes. Module instances do *not*
* contain a definition.
*
* - function scopes (IVL_SCT_FUNCTION)
* These scopes represent functions. A function may not be a root,
* so it is contained within a module instance scope. A function is
* required to have a definition (in the form of a statement) and a
* signal (IVL_SIG_REG) that is its return value.
*
* A single function scope is created each time the module with the
* definition is instantiated.
*
*
* - task scopes (IVL_SCT_TASK)
* [...]
*
* ivl_scope_attr_cnt
* ivl_scope_attr_val
* A scope may have attributes attached to it. These functions
* allow the target to access the attributes values.
*
* ivl_scope_children
* A scope may in turn contain other scopes. This method iterates
* through all the child scopes of a given scope. If the function
* returns any value other then 0, the iteration stops and the
* method returns that value. Otherwise, iteration continues until
* the children run out.
*
* If the scope has no children, this method will return 0 and
* otherwise do nothing.
*
* ivl_scope_def
* Task definition scopes carry a task definition, in the form of
* a statement. This method accesses that definition.
*