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specify.cc
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/*****************************************************************************
* Copyright 1994-2005, Elliot Mednick and Mark Hummel
* This file is part of Veriwell.
*
* Veriwell is free software; you can redistribute it and/or modify
* it 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.
*
* Veriwell 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 Foobar; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**********************************************************************
*
* specify.c
* - specify block code
*
**********************************************************************
*/
#define SPECIFY_C
#include <stdio.h>
#include <limits.h>
#include "vtypes.h"
#include "tree.h"
#include "specify.h"
#include "decl.h"
#include "schedule.h"
#include "parse.h"
#include "acc_user.h"
#include "pli.h"
#include "systask.h"
#include "strobe.h"
#include "gates.h"
#include "io.h"
#include "eval.h"
#include "pass3.h"
#include "store.h"
#include "veriwell.h"
#include "glue.h"
#include "print.h"
#include "copy.h"
#include "timescal.h"
#define edgeMask(a,b) (edge_mask[(a)][(b)])
#if 0 // obsolate
unsigned int edge_mask[4][4] = {
/* 0 1 Z X */
/* 0 */ 0x0000, 0x0002, 0x0008, 0x0008,
/* 1 */ 0x0010, 0x0000, 0x0080, 0x0080,
/* Z */ 0x1000, 0x2000, 0x0000, 0x0000,
/* X */ 0x1000, 0x2000, 0x0000, 0x0000
};
unsigned int posedgeMask = 0x8 | 0x2 | 0x2000;
unsigned int alledgeMask = 0x309a;
unsigned int negedgeMask = 0x80 | 0x10 | 0x1000;
#endif // 0
unsigned int edge_mask[4][4] = {
/* 0 1 Z X */
/* 0 */ accNoedge, accEdge01, accEdge0x, accEdge0x,
/* 1 */ accEdge10, accNoedge, accEdge1x, accEdge1x,
/* Z */ accEdgex0, accEdgex1, accNoedge, accNoedge,
/* X */ accEdgex0, accEdgex1, accNoedge, accNoedge
};
unsigned int posedgeMask = accPosedge;
unsigned int alledgeMask = accPosedge + accNegedge;
unsigned int negedgeMask = accNegedge;
extern tree current_scope;
extern struct Marker_info marker_info;
extern Group **R;
extern lineno_t stmt_lineno;
extern lineno_t lineno;
extern char *input_filename;
extern int in_initial;
#define minimum(a,b) ((a)>(b)?(b):(a))
#define maximum(a,b) ((a)<(b)?(b):(a))
/**********************************************************************
*
* check_input_port
* - verify the given identifier is currently defined
* as an input or inout port
*
**********************************************************************
*/
tree check_input_port(tree identifier)
{
tree t = IDENT_CURRENT_DECL(identifier);
/* validate port ref */
if (!t || DECL_CONTEXT(t) != current_scope /* ||
root_port_decl(t) != identifier */ ) {
error("'%s' is not in the port list", IDENT(identifier),
NULL_CHAR);
return (error_mark_node);
}
if (!PORT_INPUT_ATTR(t)) {
error("'%s' is not an input or inout port", IDENT(identifier),
NULL_CHAR);
return (error_mark_node);
}
return (identifier);
}
/**********************************************************************
*
* check_output_port
* - verify the given identifier is currently defined
* as an output or inout port
*
**********************************************************************
*/
tree check_output_port(tree identifier)
{
tree t = IDENT_CURRENT_DECL(identifier);
/* validate port ref */
if (!t || DECL_CONTEXT(t) != current_scope /* ||
root_port_decl(t) != identifier */ ) {
error("'%s' is not in the port list", IDENT(identifier),
NULL_CHAR);
return (error_mark_node);
}
if (!PORT_OUTPUT_ATTR(t)) {
error("'%s' is not an output or inout port", IDENT(identifier),
NULL_CHAR);
return (error_mark_node);
}
return (identifier);
}
/**********************************************************************
*
* check_path
* validate path arguments
*
**********************************************************************
*/
tree check_path(tree path)
{
runtime_error(path);
if (PATH_SOURCE(path) != NULL_TREE) {
warning("Edge sensitive paths are not supported in this version",
NULL_CHAR, NULL_CHAR);
if (TREE_CHAIN(PATH_INPUTS(path))) {
error
("Multiple inputs are not allowed for edge sensitive paths",
NULL_CHAR, NULL_CHAR);
}
} else if (PATH_CONDITION(path) != NULL_TREE) {
warning("Level sensitive paths are not supported in this version",
NULL_CHAR, NULL_CHAR);
} else if (PATH_POLARITY(path) != 0) {
warning("Polarized paths are not supported in this version",
NULL_CHAR, NULL_CHAR);
} else if (PATH_PARALLEL(path)) {
warning("Parallel paths are not supported in this version",
NULL_CHAR, NULL_CHAR);
}
// If you follow the cadence bnf this is correct but.....
// if( PATH_PARALLEL(path) && (TREE_CHAIN(PATH_OUTPUTS(path)) ||
// TREE_CHAIN(PATH_INPUTS(path)) ) ) {
// error( "Multiple inputs/outputs are not allowed for with => paths",
// NULL_CHAR, NULL_CHAR );
// }
return (path);
}
/**********************************************************************
*
* specify_save_param_list
* - save specparam list in module
*
**********************************************************************
*/
void specify_save_param_list(tree currentModule, tree list)
{
tree t;
/*
convert all PARAM_DECL's to SPECPARAM_DECL's
validate param list:
should not contain any parameter refs in expressions ??????
*/
for (t = list; t; t = TREE_CHAIN(t)) {
ASSERT(TREE_CODE(t) == PARAM_DECL);
TREE_SET_CODE(t, SPECPARAM_DECL);
}
/* append list to spec params of current scope
*/
MODULE_SPECDEFS(currentModule) =
chainon(list, MODULE_SPECDEFS(currentModule));
}
/**********************************************************************
*
* build_path( tree inputs, tree outputs, int parallelFlag )
* - create a PATH_NODE
*
**********************************************************************
*/
tree
build_path(tree inputs, tree outputs, tree source, tree delays,
tree condition, int parallelFlag, int edge, int polarity)
{
tree t;
ASSERT(parallelFlag == TRUE || parallelFlag == FALSE);
ASSERT(outputs != NULL_TREE);
ASSERT(inputs != NULL_TREE);
ASSERT(edge >= -1 && edge <= 1);
ASSERT(polarity >= -1 && polarity <= 1);
t = make_node(PATH_NODE);
PATH_SOURCE_LINE(t) = lineno;
PATH_SOURCE_FILE(t) = input_filename;
PATH_SOURCE(t) = source;
PATH_DELAYS(t) = delays;
PATH_INPUTS(t) = inputs;
PATH_OUTPUTS(t) = outputs;
PATH_PARALLEL(t) = parallelFlag;
PATH_EDGE(t) = edge;
PATH_CONDITION(t) = condition;
PATH_POLARITY(t) = polarity;
return (t);
}
/**********************************************************************
*
* insert_specify_paths( tree module )
* - validate and insert specify paths
*
**********************************************************************
*/
void insert_specify_paths(tree module)
{
tree paths;
tree out_list;
tree out_decl;
tree out_ident;
tree t;
tree gate;
int driver_count;
int msb;
int lsb;
int bitNumber;
tree instance;
int outputNumber;
ASSERT(module != NULL_TREE);
for (paths = MODULE_SPECDEFS(module); paths; paths = TREE_CHAIN(paths)) {
if (TREE_CODE(paths) != PATH_NODE) {
continue;
}
runtime_error(paths);
/* this node is only used by pli to iterate though the modpaths */
instance = make_node(PATH_INSTANCE);
PATH_INSTANCE_MODULE(instance) = module;
PATH_INSTANCE_PATHDESC(instance) = paths;
TREE_CHAIN(instance) = MODULE_SPECINST(module);
MODULE_SPECINST(module) = instance;
outputNumber = 0;
for (out_list = PATH_OUTPUTS(paths); out_list;
out_list = TREE_CHAIN(out_list)) {
t = TREE_PURPOSE(out_list);
ASSERT(t != NULL_TREE);
switch (TREE_CODE(t)) {
case PART_REF:
out_ident = PART_NAME(t);
out_decl = IDENT_CURRENT_DECL(out_ident);
msb =
get_range(PART_MSB_(t), IDENTIFIER_POINTER(out_ident));
lsb =
get_range(PART_LSB_(t), IDENTIFIER_POINTER(out_ident));
break;
case BIT_REF:
out_ident = BIT_REF_NAME(t);
out_decl = IDENT_CURRENT_DECL(out_ident);
msb =
get_range(BIT_EXPR(t), IDENTIFIER_POINTER(out_ident));
lsb = msb;
break;
default:
out_ident = t;
out_decl = IDENT_CURRENT_DECL(out_ident);
if (TREE_CODE(out_decl) == NET_VECTOR_DECL) {
msb = MSB(out_decl);
lsb = LSB(out_decl);
} else {
msb = 0;
lsb = 0;
}
break;
}
ASSERT(out_decl != NULL_TREE);
if (lsb > msb) {
int temp;
temp = lsb;
lsb = msb;
msb = temp;
}
for (bitNumber = lsb; bitNumber <= msb; bitNumber++) {
driver_count = get_driver_count(out_decl, bitNumber);
if (driver_count == 0) {
error
("specify path for net %s does not connect to a gate primitive",
IDENT(out_ident), NULL_CHAR);
continue;
}
if (driver_count > 1) {
error("net %s has more than one driver",
IDENT(out_ident), NULL_CHAR);
return;
}
gate = get_first_driver(out_decl, bitNumber);
ASSERT(gate != NULL_TREE);
if (TREE_CODE(gate) != GATE_INSTANCE) {
warning
("specify path for net %s does not connect to a gate primitive",
IDENT(out_ident), NULL_CHAR);
return;
}
switch ((int) TREE_TYPE(gate)) {
case GATE_AND_TYPE:
case GATE_NAND_TYPE:
case GATE_OR_TYPE:
case GATE_NOR_TYPE:
case GATE_XOR_TYPE:
case GATE_XNOR_TYPE:
case GATE_BUF_TYPE:
case GATE_NOT_TYPE:
case GATE_BUFIF0_TYPE:
case GATE_BUFIF1_TYPE:
case GATE_NOTIF0_TYPE:
case GATE_NOTIF1_TYPE:
case GATE_NMOS_TYPE:
case GATE_PMOS_TYPE:
case GATE_RNMOS_TYPE:
case GATE_RPMOS_TYPE:
case GATE_CMOS_TYPE:
case GATE_RCMOS_TYPE:
case GATE_UDP_TYPE:
break;
case GATE_TRAN_TYPE:
case GATE_RTRAN_TYPE:
case GATE_TRANIF0_TYPE:
case GATE_TRANIF1_TYPE:
case GATE_RTRANIF0_TYPE:
case GATE_RTRANIF1_TYPE:
error
("specify paths cannot be assigned to bidirectional switch\n",
NULL_CHAR, NULL_CHAR);
return;
case GATE_PULLUP_TYPE:
case GATE_PULLDN_TYPE:
error
("specify paths cannot be assigned to pullups or pulldowns\n",
NULL_CHAR, NULL_CHAR);
return;
default:
ASSERT(FALSE);
}
if (TREE_CHAIN(GATE_OUTPUT_LIST(gate)) != NULL_TREE) {
error
("specify paths cannot be assigned to buf/not gates driving multiple outputs\n",
NULL_CHAR, NULL_CHAR);
return;
}
add_spec_to_gate(module, gate, paths, outputNumber);
outputNumber++;
}
}
}
}
/**********************************************************************
*
* is_driven_by
* - return TRUE if decl[bit] is driven by gate
* bit is ignore if scalar
*
**********************************************************************
*/
int is_driven_by(tree driver, tree decl, int bit)
{
tree t;
tree t1;
int lsb;
int msb;
tree surrogate;
if (TREE_CODE(driver) != GATE_INSTANCE) {
return (TRUE);
}
for (t = GATE_OUTPUT_LIST(driver); t != NULL_TREE; t = TREE_CHAIN(t)) {
ASSERT(TREE_CODE(t) == TREE_LIST);
t1 = TREE_PURPOSE(t);
switch (TREE_CODE(t1)) {
case BIT_REF:
surrogate = BIT_REF_DECL(t1);
ASSERT(surrogate != NULL_TREE);
if (TREE_CHAIN(surrogate) != decl) {
return (FALSE);
}
msb = get_range(BIT_EXPR(t1),
IDENTIFIER_POINTER(BIT_REF_NAME(t1)));
if (msb == bit) {
return (TRUE);
}
break;
case PART_REF:
surrogate = PART_DECL(t1);
ASSERT(surrogate != NULL_TREE);
if (TREE_CHAIN(surrogate) != decl) {
return (FALSE);
}
msb = get_range(PART_MSB_(t1),
IDENTIFIER_POINTER(PART_NAME(t1)));
lsb = get_range(PART_LSB_(t1),
IDENTIFIER_POINTER(PART_NAME(t1)));
if (bit >= lsb && bit <= msb) {
return (TRUE);
}
break;
default:
surrogate = t1;
ASSERT(surrogate != NULL_TREE);
if (TREE_CHAIN(surrogate) == decl) {
return (TRUE);
}
break;
}
}
return (FALSE);
}
/**********************************************************************
*
* get_driver_count(tree decl, int bit)
* - count the number of drivers on net given its decl
*
**********************************************************************
*/
int get_driver_count(tree decl, int bit)
{
int count;
tree t;
tree driver;
ASSERT(decl != NULL_TREE);
count = 0;
for (t = NET_SOURCE(decl); t; t = NET_SOURCE(t)) {
driver = NET_ASSIGNMENT(t);
if (driver != NULL && TREE_CODE(driver) == TREE_LIST &&
GATE_TERMINAL_GATE(driver) != NULL &&
TREE_CODE(GATE_TERMINAL_GATE(driver)) == GATE_INSTANCE) {
driver = GATE_TERMINAL_GATE(driver);
}
if (driver == NULL || is_driven_by(driver, decl, bit)) {
count++;
}
}
return (count);
}
/**********************************************************************
*
* get_first_driver(tree decl, bit)
* - return the first driver of the net given its decl
*
**********************************************************************
*/
tree get_first_driver(tree decl, int bit)
{
int count;
tree t;
tree driver;
ASSERT(decl != NULL_TREE);
for (t = NET_SOURCE(decl); t; t = NET_SOURCE(t)) {
driver = NET_ASSIGNMENT(t);
if (driver != NULL && TREE_CODE(driver) == TREE_LIST &&
GATE_TERMINAL_GATE(driver) != NULL &&
TREE_CODE(GATE_TERMINAL_GATE(driver)) == GATE_INSTANCE) {
driver = GATE_TERMINAL_GATE(driver);
}
if (driver == NULL || is_driven_by(driver, decl, bit)) {
return (driver);
}
}
return (NULL_TREE);
}
/**********************************************************************
*
* add_spec_to_gate( tree module, tree driver, tree pathdesc )
* - add path info to gate
*
*
**********************************************************************
*/
void
add_spec_to_gate(tree module, tree gate, tree pathdesc, int outputNumber)
{
tree t;
tree spec;
ASSERT(pathdesc != NULL_TREE);
ASSERT(gate != NULL_TREE);
ASSERT(TREE_CODE(gate) == GATE_INSTANCE);
spec = GATE_PATH_OUTPUT(gate);
if (spec == NULL_TREE) {
spec = make_node(PATH_OUTPUT);
PATH_OUTPUT_GATE(spec) = gate;
GATE_PATH_OUTPUT(gate) = spec;
PATH_OUTPUT_VALUE(spec) = X;
PATH_OUTPUT_CURRENT_VALUE(spec) = X;
PATH_OUTPUT_PATHDESC(spec) = NULL_TREE;
PATH_OUTPUT_CONSTRAINTS(spec) = NULL_TREE;
PATH_OUTPUT_SCB(spec) = BuildSCB(spec, NOLIST);
TREE_CHAIN(spec) = MODULE_SPECINST(module);
MODULE_SPECINST(module) = spec;
}
t = make_node(TREE_LIST);
t->common.sub_label = outputNumber;
TREE_PURPOSE(t) = pathdesc;
TREE_CHAIN(t) = PATH_OUTPUT_PATHDESC(spec);
PATH_OUTPUT_PATHDESC(spec) = t;
// TREE_CHAIN(spec) = MODULE_SPECINST(module);
// MODULE_SPECINST(module) = spec;
}
/**********************************************************************
*
* pass3_specify( tree spec )
* - perform pass3 setup on specify path.
*
**********************************************************************
*/
void pass3_specify(tree gate)
{
tree in_list;
tree t;
tree pathdesc;
tree pathdescList;
tree decl;
tree constraint;
tree spec;
tree ref;
tree t1;
tree instance;
ASSERT(gate != NULL_TREE);
ASSERT(TREE_CODE(gate) == GATE_INSTANCE);
spec = GATE_PATH_OUTPUT(gate);
if (spec == NULL_TREE) {
return;
}
pathdescList = PATH_OUTPUT_PATHDESC(spec);
if (pathdescList == NULL_TREE) {
return;
}
for (; pathdescList; pathdescList = TREE_CHAIN(pathdescList)) {
ASSERT(TREE_CODE(pathdescList) == TREE_LIST);
pathdesc = TREE_PURPOSE(pathdescList);
ASSERT(pathdesc != NULL_TREE);
/* find instance */
for (instance = MODULE_SPECINST(GATE_SCOPE(gate));
instance; instance = TREE_CHAIN(instance)) {
if (TREE_CODE(instance) != PATH_INSTANCE) {
continue;
}
if (PATH_INSTANCE_PATHDESC(instance) == pathdesc) {
break;
}
}
ASSERT(instance != NULL);
constraint = make_node(PATH_CONSTRAINT);
PATH_CONSTRAINT_OUTPUT_NUMBER(constraint) =
pathdescList->common.sub_label;
PATH_CONSTRAINT_DEPENDENCIES(constraint) = NULL_TREE;
PATH_CONSTRAINT_INSTANCE(constraint) = instance;
PATH_CONSTRAINT_PATHDESC(constraint) = pathdesc;
TREE_CHAIN(constraint) = PATH_OUTPUT_CONSTRAINTS(spec);
PATH_OUTPUT_CONSTRAINTS(spec) = constraint;
runtime_error(pathdesc);
calculate_delays(constraint);
for (in_list = PATH_INPUTS(pathdesc); in_list;
in_list = TREE_CHAIN(in_list)) {
t = make_node(TREE_LIST);
MODPATH_INPUT_TERMINAL_PARENT(t) = constraint;
if (PATH_CONSTRAINT_DEPENDENCIES(constraint) == NULL) {
PATH_CONSTRAINT_DEPENDENCIES(constraint) = t;
} else {
for (t1 = PATH_CONSTRAINT_DEPENDENCIES(constraint);
TREE_CHAIN(t1); t1 = TREE_CHAIN(t1));
TREE_CHAIN(t1) = t;
}
ref = TREE_PURPOSE(in_list);
ASSERT(ref);
switch (TREE_CODE(ref)) {
case BIT_REF:
TREE_PURPOSE(t) =
build_bit_ref(BIT_REF_NAME(ref), BIT_EXPR(ref));
ref = TREE_PURPOSE(t);
decl = IDENT_CURRENT_DECL(BIT_REF_NAME(ref));
BIT_REF_DECL(ref) = decl;
ASSERT(decl != NULL_TREE);
break;
case PART_REF:
TREE_PURPOSE(t) =
build_part_ref(PART_NAME(ref), PART_MSB_(ref),
PART_LSB_(ref));
ref = TREE_PURPOSE(t);
decl = IDENT_CURRENT_DECL(PART_NAME(ref));
PART_DECL(ref) = decl;
ASSERT(decl != NULL_TREE);
break;
default:
decl = IDENT_CURRENT_DECL(ref);
ASSERT(decl != NULL_TREE);
TREE_PURPOSE(t) = decl;
break;
}
}
}
}
/**********************************************************************
*
* handle_specify_path
* - check specify path and schedule if needed
* return TRUE if propagation will be handled by
* specify_block node
*
**********************************************************************
*/
int handle_specify_path(tree gate)
{
enum logical_value oldValue;
enum logical_value newValue;
delay_t delay;
tree dependency;
tree constraint;
tree t;
time64 latestTime;
delay_t currentDelay;
tree spec;
BOOL result;
BOOL compareFlag;
ASSERT(gate != NULL_TREE);
ASSERT(TREE_CODE(gate) == GATE_INSTANCE);
spec = GATE_PATH_OUTPUT(gate);
ASSERT(spec != NULL_TREE);
ASSERT(!in_initial);
latestTime.timeh = 0;
latestTime.timel = 0;
result = FALSE;
delay = INT_MAX;
newValue = GATE_OUTPUT(gate);
oldValue = PATH_OUTPUT_CURRENT_VALUE(spec);
ASSERT(PATH_OUTPUT_CONSTRAINTS(spec) != NULL_TREE);
for (constraint = PATH_OUTPUT_CONSTRAINTS(spec); constraint;
constraint = TREE_CHAIN(constraint)) {
ASSERT(TREE_CODE(constraint) == PATH_CONSTRAINT);
ASSERT(PATH_CONSTRAINT_DEPENDENCIES(constraint) != NULL_TREE);
for (t = PATH_CONSTRAINT_DEPENDENCIES(constraint); t;
t = TREE_CHAIN(t)) {
ASSERT(TREE_CODE(t) == TREE_LIST);
dependency = TREE_PURPOSE(t);
ASSERT(dependency != NULL_TREE);
// this is a hack for now - any bit will activate
switch (TREE_CODE(dependency)) {
case BIT_REF:
dependency = BIT_REF_DECL(dependency);
ASSERT(dependency != NULL_TREE);
break;
case PART_REF:
dependency = PART_DECL(dependency);
ASSERT(dependency != NULL_TREE);
break;
}
if (CMPTIME64(&latestTime, &DECL_UPDATE_TIME(dependency)) < 0) {
ASSIGNTIME64(&latestTime, &DECL_UPDATE_TIME(dependency));
delay =
PATH_CONSTRAINT_DELAY(constraint, oldValue, newValue);
} else
if (CMPTIME64(&latestTime, &DECL_UPDATE_TIME(dependency))
== 0) {
currentDelay =
PATH_CONSTRAINT_DELAY(constraint, oldValue, newValue);
if (currentDelay < delay) {
delay = currentDelay;
}
}
}
}
ADDTIME6432(&latestTime, &latestTime, delay);
compareFlag = CMPTIME64(&latestTime, &CurrentTime);
if (compareFlag >= 0) {
/* this should work for the wrap around case */
delay = latestTime.timel - CurrentTime.timel;
// this is a test kludge
// if( PATH_OUTPUT_VALUE(spec)==PATH_OUTPUT_CURRENT_VALUE(spec) ) {
Schedule(delay, PATH_OUTPUT_SCB(spec), 0);
// }
PATH_OUTPUT_VALUE(spec) = newValue;
result = TRUE;
} else {
PATH_OUTPUT_VALUE(spec) = newValue;
PATH_OUTPUT_CURRENT_VALUE(spec) = newValue;
}
return (result);
}
/**********************************************************************
*
* propagate_specify_path( tree pc )
* - pass on specify path output
*
**********************************************************************
*/
void propagate_specify_path(tree pc)
{
tree gate;
ASSERT(pc != NULL_TREE);
ASSERT(TREE_CODE(pc) == PATH_OUTPUT);
gate = PATH_OUTPUT_GATE(pc);
ASSERT(gate != NULL_TREE);
ASSERT(TREE_CODE(gate) == GATE_INSTANCE);
propagate_specify_output(gate, PATH_OUTPUT_VALUE(pc));
PATH_OUTPUT_CURRENT_VALUE(pc) = PATH_OUTPUT_VALUE(pc);
}
/**********************************************************************
*
* calculate_delays( tree constraint )
* - recalculate the delays for path.
*
**********************************************************************
*/
void calculate_delays(tree constraint)
{
int delays[6];
tree t;
int count;
tree pathdesc;
nbits_t *dummy;
ASSERT(X >= 0 && X <= 3);
ASSERT(Z >= 0 && Z <= 3);
ASSERT(ONE >= 0 && ONE <= 3);
ASSERT(ZERO >= 0 && ZERO <= 3);
ASSERT(constraint != NULL);
ASSERT(TREE_CODE(constraint) == PATH_CONSTRAINT);
pathdesc = PATH_CONSTRAINT_PATHDESC(constraint);
ASSERT(pathdesc != NULL_TREE);
ASSERT(TREE_CODE(pathdesc) == PATH_NODE);
for (t = PATH_DELAYS(pathdesc), count = 0; t;
t = TREE_CHAIN(t), count++) {
ASSERT(count < 6);
ASSERT(TREE_PURPOSE(t) != NULL_TREE);
delays[count] = get_delay(TREE_PURPOSE(t));
}
switch (count) {
case 1:
PATH_CONSTRAINT_DELAY(constraint, ZERO, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ONE, ZERO) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ZERO, Z) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, Z, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ONE, Z) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, Z, ZERO) = delays[0];
break;
case 2:
PATH_CONSTRAINT_DELAY(constraint, ZERO, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ZERO, Z) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, Z, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ONE, Z) = delays[1];
PATH_CONSTRAINT_DELAY(constraint, Z, ZERO) = delays[1];
PATH_CONSTRAINT_DELAY(constraint, ONE, ZERO) = delays[1];
break;
case 3:
PATH_CONSTRAINT_DELAY(constraint, ZERO, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, Z, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ONE, ZERO) = delays[1];
PATH_CONSTRAINT_DELAY(constraint, Z, ZERO) = delays[1];
PATH_CONSTRAINT_DELAY(constraint, ZERO, Z) = delays[2];
PATH_CONSTRAINT_DELAY(constraint, ONE, Z) = delays[2];
break;
case 6:
PATH_CONSTRAINT_DELAY(constraint, ZERO, ONE) = delays[0];
PATH_CONSTRAINT_DELAY(constraint, ONE, ZERO) = delays[1];
PATH_CONSTRAINT_DELAY(constraint, ZERO, Z) = delays[2];
PATH_CONSTRAINT_DELAY(constraint, Z, ONE) = delays[3];
PATH_CONSTRAINT_DELAY(constraint, ONE, Z) = delays[4];
PATH_CONSTRAINT_DELAY(constraint, Z, ZERO) = delays[5];
break;
default:
ASSERT(FALSE);
}
setXPathConstraints(constraint);
}
/**********************************************************************
*
* setXPathConstraints( tree constraint )
* - calculate the x delays for paths
*
**********************************************************************
*/
void setXPathConstraints(tree constraint)
{
ASSERT(constraint != NULL);
ASSERT(TREE_CODE(constraint) == PATH_CONSTRAINT);
PATH_CONSTRAINT_DELAY(constraint, ZERO, X) =
minimum(PATH_CONSTRAINT_DELAY(constraint, ZERO, Z),
PATH_CONSTRAINT_DELAY(constraint, ZERO, ONE));
PATH_CONSTRAINT_DELAY(constraint, ONE, X) =
minimum(PATH_CONSTRAINT_DELAY(constraint, ONE, Z),
PATH_CONSTRAINT_DELAY(constraint, ONE, ZERO));
PATH_CONSTRAINT_DELAY(constraint, Z, X) =
minimum(PATH_CONSTRAINT_DELAY(constraint, Z, ONE),
PATH_CONSTRAINT_DELAY(constraint, Z, ZERO));
PATH_CONSTRAINT_DELAY(constraint, X, ZERO) =
maximum(PATH_CONSTRAINT_DELAY(constraint, Z, ZERO),
PATH_CONSTRAINT_DELAY(constraint, ONE, ZERO));
PATH_CONSTRAINT_DELAY(constraint, X, ONE) =
maximum(PATH_CONSTRAINT_DELAY(constraint, Z, ONE),
PATH_CONSTRAINT_DELAY(constraint, ZERO, ONE));
PATH_CONSTRAINT_DELAY(constraint, X, Z) =
maximum(PATH_CONSTRAINT_DELAY(constraint, ONE, Z),
PATH_CONSTRAINT_DELAY(constraint, ZERO, Z));
}
/**********************************************************************
*
* specify_update_timings( tree module )
* - recalculate the delays for paths in module and
* timing checks.
*
**********************************************************************
*/
void specify_update_timings(tree module)
{
tree t;
tree constraint;
ASSERT(module != NULL_TREE);
ASSERT(TREE_CODE(module) == MODULE_BLOCK);
for (t = MODULE_SPECINST(module); t; t = TREE_CHAIN(t)) {
if (TREE_CODE(t) == PATH_OUTPUT) {
ASSERT(PATH_OUTPUT_CONSTRAINTS(t) != NULL_TREE);
for (constraint = PATH_OUTPUT_CONSTRAINTS(t); constraint;
constraint = TREE_CHAIN(constraint)) {
ASSERT(TREE_CODE(constraint) == PATH_CONSTRAINT);
calculate_delays(constraint);
}
} else if (TREE_CODE(t) == TIMING_CHECK) {
calculate_params(t);
}
}
}
/**********************************************************************
*
* build_timing_event
* - build parse node for an event related to a timing check.
*
**********************************************************************
*/
tree build_timing_event(int edge, tree expression, tree condition)
{
tree t;
ASSERT(expression != NULL_TREE);
t = make_node(TIMING_EVENT);
TIMING_EVENT_EXPRESSION(t) = expression;
TIMING_EVENT_CONDITION(t) = condition;
TIMING_EVENT_EDGESPEC(t) = edge;
return (t);
}
/**********************************************************************
*
* build_timing_statement
* - build parse node for a timing check.
*
**********************************************************************
*/
tree
build_timing_statement(int checkType, tree event1, tree event2,
tree param1, tree param2, tree notifier)
{
tree t;
ASSERT(checkType == SETUP ||
checkType == HOLD ||
checkType == WIDTH ||
checkType == PERIOD ||
checkType == SKEW ||
checkType == RECOVERY || checkType == SETUPHOLD);
t = make_node(CHECK_SPEC);
CHECK_SPEC_EVENT1(t) = event1;
CHECK_SPEC_EVENT2(t) = event2;
CHECK_SPEC_PARAM1(t) = param1;
CHECK_SPEC_PARAM2(t) = param2;
CHECK_SPEC_NOTIFIER(t) = notifier;
CHECK_SPEC_CHECKTYPE(t) = checkType;
return (t);
}
/**********************************************************************
*
* pass3_timing_check( tree check )
* - perform pass3 setup on timing checks.
*
**********************************************************************
*/
void pass3_timing_check(tree check, tree module)
{
tree event1;
tree event2;
tree condition1;
tree condition2;
unsigned int edgeSpec1;
unsigned int edgeSpec2;
tree expression;