working on flash with induction

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Ken McMillan 2018-01-17 18:45:29 -08:00
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Коммит e5c49c1858
2 изменённых файлов: 1064 добавлений и 0 удалений

498
test/flash.ivy Normal file
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#lang ivy1.7
# This is a model of the FLASH cache coherenec protocol. The network
# is modeled in a relation way that is convenient for decidable
# invariant checking.
# In this version we prove only that there are no two exclusive copies.
type id
type cache_state = { invalid, shared, exclusive }
type wait_type = { none, get, getX }
module cache_line = {
individual wait : wait_type
relation invmarked
individual state : cache_state
}
module header = {
relation pending
relation local_
relation dirty
relation head
individual hptr : id
relation list
relation real(X:id)
relation upgrade
relation shlist(X:id)
}
module network = {
relation get(S:id,D:id)
relation put(S:id,D:id)
relation getX(S:id,D:id)
relation putX(S:id,D:id)
relation nak(S:id,D:id)
relation fack(S:id,D:id)
relation shwb(S:id,D:id)
}
module wb_network = {
individual proc : id
relation wb
}
individual home : id
instantiate cache(X:id) : cache_line
instantiate dir : header
relation collecting
individual requester : id
instantiate net : network
relation rp_net(X:id)
individual real_owner : id
individual fwd_get : wait_type
instantiate wbnet : wb_network
individual last_WB : id
relation nakc
relation invnet(X:id)
relation invack(X:id)
# locals used in actions
individual src : id
individual dst : id
after init {
cache(X).state := invalid;
cache(X).wait := none;
cache(X).invmarked := false;
dir.pending := false;
dir.dirty := false;
collecting := false;
net.get(X,Y) := false;
net.put(X,Y) := false;
net.getX(X,Y) := false;
net.putX(X,Y) := false;
net.fack(X,Y) := false;
net.shwb(X,Y) := false;
net.nak(X,Y) := false;
dir.list := false;
dir.head := false;
dir.shlist(X) := false;
rp_net(X) := false;
fwd_get := none;
wbnet.wb := false;
real_owner := home;
invnet(X) := false;
invack(X) := false;
nakc := false
}
action pi_Local_Get_dirty = {
assume cache(home).state = invalid;
assume cache(home).wait = none;
assume ~dir.pending;
assume dir.dirty;
dir.pending := true;
collecting := false;
cache(home).wait := get;
net.get(home,dir.hptr) := true;
requester := home
}
action pi_Local_Get = {
assume cache(home).state = invalid;
assume cache(home).wait = none;
assume ~dir.pending;
assume ~dir.dirty;
assume ~cache(home).invmarked;
dir.local_ := true;
cache(home).state := shared
}
# TODO: can this ever happen?
action pi_Local_Get_im = {
assume cache(home).state = invalid;
assume cache(home).wait = none;
assume ~dir.pending;
assume ~dir.dirty;
assume cache(home).invmarked;
cache(home).invmarked := false
}
action pi_Remote_Get = {
assume src ~= home;
assume cache(src).state = invalid;
assume cache(src).wait = none;
cache(src).wait := get;
net.get(src,home) := true;
src := *
}
action ni_Local_Get_nak = {
assume net.get(src,home);
assume home ~= src;
assume ~rp_net(src);
assume dir.pending | (dir.dirty & dir.local_ & cache(home).state~=exclusive) | (dir.dirty & ~dir.local_ & src = dir.hptr);
net.get(src,home) := false;
net.nak(home,src) := true
}
# action ni_Local_Get = {
# assume net.get(src,home);
# assume home ~= src;
# assume ~dir.pending & ~dir.dirty & ~ rp_net(src) & ~cache(src).invmarked;
# net.get(src,home) := false;
# net.put(home,src) := true;
# if (dir.head) {
# dir.list := true;
# dir.shlist(src) := true;
# dir.real := dir.shlist # what is this?
# }
# else {
# dir.head := true;
# dir.hptr := src
# }
# }
action ni_Local_Get = {
assume net.get(src,home);
assume home ~= src;
assume ~dir.pending & ~dir.dirty & ~ rp_net(src) & ~cache(src).invmarked;
net.get(src,home) := false;
net.put(home,src) := true;
dir.head := true;
dir.hptr := src;
dir.shlist(src) := true;
src := *
}
action ni_Local_Get_fwd = {
assume net.get(src,home);
assume home ~= src;
assume ~dir.pending & dir.dirty & ~dir.local_ & src ~= dir.hptr;
net.get(src,home) := false;
dir.pending := true;
net.get(src,dir.hptr) := true;
src := *
}
action ni_Remote_Put = {
assume dst ~= home;
assume net.put(src,dst);
net.put(src,dst) := false;
cache(dst).wait := none;
cache(dst).state := shared;
src := *;
dst := *
}
# Non-deterministically drop a shared line from the cache. Send an rp message.
# informing the directory.
action pi_Remote_Replace = {
assume cache(src).state=shared & cache(src).wait=none & src ~= home;
cache(src).state := invalid;
rp_net(src) := true;
src := *
}
# Directory receives a replace message, removes sender from sharing list, assuming it is not head.
action ni_Replace_list = {
assume rp_net(src);
assume dir.hptr ~= src;
rp_net(src) := false;
dir.shlist(src) := false;
dir.real(src) := false;
src := *
}
# Remote is invalid and wants an exclusive copy
action pi_Remote_GetX = {
assume cache(src).state=invalid & cache(src).wait=none & src ~= home;
cache(src).wait := getX;
net.getX(src,home) := true;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when no invalidation is needed, that is, there is no exclusive
# copy and either the sharing list is empty or it contains only the
# source.
action ni_Local_GetX = {
assume net.getX(src,home);
assume home ~= src;
assume ~dir.pending & ~dir.dirty;
assume ~dir.head | src = dir.hptr;
assume ~dir.head | ~dir.shlist(X) | X = src;
net.getX(src,home) := false;
dir.dirty := true;
dir.head := true;
dir.hptr := src;
dir.real(X) := X = src;
dir.shlist(X) := X = src;
net.putX(home,src) := true;
real_owner := src; # ghost
cache(home).state := invalid;
cache(home).invmarked := (cache(home).wait = get & dir.local_) | cache(home).invmarked;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when the request is nak'd
action ni_Local_GetX_nak = {
assume net.getX(src,home);
assume home ~= src;
assume dir.pending | dir.dirty & cache(home).state ~= exclusive | src = dir.hptr;
net.getX(src,home) := false;
net.nak(home,src) := true;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when the request is pended.
action ni_Local_GetX_pend = {
assume net.getX(src,home);
assume home ~= src;
assume ~dir.pending & dir.dirty & ~dir.local_ & src ~= dir.hptr;
net.getX(src,home) := false;
dir.pending := true;
collecting := false;
net.getX(src,dir.hptr) := true;
fwd_get := getX;
requester := src;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when invalidations are sent out.
action ni_localGetX_inv = {
assume net.getX(src,home);
assume home ~= src;
assume ~dir.pending & ~dir.dirty & ~dir.local_;
assume dir.head;
assume src ~= dir.hptr | (dir.shlist(dst) & dst~=src);
net.getX(src,home) := false;
invnet(X) := X ~= home & X ~= src & dir.shlist(X);
collecting := true;
# m1 := m;
# last_other_invack := (dir.hptr ~= src) ? dir.hptr . {i . i in Proc, dir.shlist(i) & i~=src};
cache(home).invmarked := (cache(home).wait = get & dir.local_) | cache(home).invmarked;
dir.local_ := false;
dir.dirty := true;
dir.head := true;
dir.hptr := src;
dir.pending := true;
dir.real(X) := X ~= home & X ~= src & dir.shlist(X);
dir.shlist(X) := X = src;
net.putX(home,src) := true;
real_owner := src;
cache(home).state := invalid;
src := *;
dst := *
}
action ni_Remote_PutX = {
assume net.putX(src,dst);
assume dst~=home & cache(dst).wait = getX;
net.putX(src,dst) := false;
cache(dst).wait :=none;
cache(dst).invmarked := false;
cache(dst).state :=exclusive;
src := *;
dst := *
}
action pi_Remote_PutX = {
assume cache(src).state = exclusive & src ~= home; # cache(src).wait=none ???
cache(src).state := invalid;
wbnet.proc := src;
wbnet.wb := true;
src := *
}
action ni_Inv = {
assume invnet(dst) & dst~=home;
invnet(dst) := false;
invack(dst) := true;
cache(dst).invmarked := (cache(dst).wait = get) | cache(dst).invmarked;
cache(dst).state := invalid;
dst := *
}
action ni_InvAck = {
assume dir.pending & invack(src) & src~=home;
assume dir.real(dst) & dst ~= src;
invack(src) := false;
dir.real(src) := false;
# last_invack := src;
# last_other_invack := {i : i in Proc, dir.real(i) & i ~= src};
src := *;
dst := *
}
action ni_InvAck_last = {
assume dir.pending & invack(src) & src~=home;
assume ~dir.real(X) | X = src;
dir.pending := false;
collecting := false;
# m1 := undefined; ???
invack(src) := false;
dir.real(src) := false;
# last_invack := src;
if ( dir.local_ & ~ dir.dirty) {
dir.local_ := false
}
}
action ni_WB = {
assume wbnet.wb;
wbnet.wb := false;
dir.dirty := false;
dir.head := false;
dir.shlist(X) := false;
last_WB := wbnet.proc
}
action ni_Remote_GetX_nak = {
assume net.getX(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state ~= exclusive;
net.getX(src,dst) := false;
fwd_get := none;
# fwd_src := src;
nakc := true;
net.nak(dst,src) := true;
src := *;
dst := *
}
action ni_Remote_GetX_fwd = {
assume net.getX(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state = exclusive;
net.getX(src,dst) := false;
cache(dst).state := invalid;
fwd_get := none;
# fwd_src := src;
net.putX(dst,src) := true;
real_owner := src;
if src~=home {
net.fack(src,home) := true
};
src := *;
dst := *
}
action ni_FAck = {
assume net.fack(src,home);
net.fack(src,home) := false;
dir.pending := false;
if dir.dirty {
dir.hptr := src;
dir.shlist(X) := X = src
};
src := *
}
action ni_Remote_Get_nak = {
assume net.get(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state ~= exclusive;
net.get(src,dst) := false;
fwd_get := none;
# fwd_src := src;
nakc := true;
net.nak(dst,src) := true;
src := *;
dst := *
}
action ni_Remote_Get_fwd = {
assume net.get(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state = exclusive;
net.get(src,dst) := false;
# assume ~cache(src).invmarked; TODO: ???
cache(dst).state := shared;
fwd_get := none;
# fwd_src := src;
net.put(dst,src) := true;
if src~=home {
real_owner := home;
net.shwb(src,home) := true
};
# shwb_src := dst;
src := *;
dst := *
}
action ni_ShWB = {
assume net.shwb(src,home);
net.shwb(src,home) := false;
dir.pending := false;
dir.dirty := false;
dir.shlist(src) := true;
dir.real(X) := dir.shlist(X);
# last_WB := shwb_src;
src := *
}
action ni_NAK_Clear = {
assume nakc;
dir.pending := false;
nakc := false
}
export pi_Local_Get_dirty
export pi_Local_Get
export pi_Local_Get_im
export pi_Remote_Get
export ni_Local_Get_nak
export ni_Local_Get
export ni_Local_Get_fwd
export ni_Remote_Put
export pi_Remote_Replace
export ni_Replace_list
export pi_Remote_GetX
export ni_Local_GetX
export ni_Local_GetX_nak
export ni_Local_GetX_pend
export ni_localGetX_inv
export ni_Remote_PutX
export pi_Remote_PutX
export ni_Inv
export ni_InvAck
export ni_InvAck_last
export ni_WB
export ni_Remote_GetX_nak
export ni_Remote_GetX_fwd
export ni_FAck
export ni_Remote_Get_nak
export ni_Remote_Get_fwd
export ni_ShWB
export ni_NAK_Clear
invariant [coherent]
cache(X).state = exclusive -> X = real_owner
invariant [nodups]
cache(X).state = exclusive -> dir.dirty & ~wbnet.wb & ~net.shwb(Y,home)
invariant net.putX(X,Y) -> Y = real_owner & dir.dirty & ~wbnet.wb & ~net.shwb(Z,home) & cache(Z).state ~= exclusive
invariant net.shwb(Z,home) -> dir.dirty & ~wbnet.wb & ~net.putX(X,Y) & cache(X).state ~= exclusive
invariant wbnet.wb -> dir.dirty & ~net.putX(X,Y) & ~net.shwb(Z,home) & cache(X).state ~= exclusive
invariant net.putX(X,Y) & net.putX(Z,Y) -> X = Z
invariant net.shwb(X,home) & net.shwb(Z,home) -> X = Z

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test/flash2.ivy Normal file
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#lang ivy1.7
# This is a model of the FLASH cache coherenec protocol. The network
# is modeled in a relation way that is convenient for decidable
# invariant checking.
# In this version we prove coherence: an exclusive copy implies no other copies.
type id
type cache_state = { invalid, shared, exclusive }
type wait_type = { none, get, getX }
module cache_line = {
individual wait : wait_type
relation invmarked
individual state : cache_state
}
module header = {
relation pending
relation local_
relation dirty
relation head
individual hptr : id
relation list
relation real(X:id)
relation upgrade
relation shlist(X:id)
}
module network = {
relation get(S:id,D:id)
relation put(S:id,D:id)
relation getX(S:id,D:id)
relation putX(S:id,D:id)
relation nak(S:id,D:id)
relation fack(S:id,D:id)
relation shwb(S:id,D:id)
}
module wb_network = {
individual proc : id
relation wb
}
individual home : id
instantiate cache(X:id) : cache_line
instantiate dir : header
relation collecting
individual requester : id
instantiate net : network
relation rp_net(X:id)
individual real_owner : id
individual fwd_get : wait_type
instantiate wbnet : wb_network
individual last_WB : id
relation nakc
relation invnet(X:id)
relation invack(X:id)
# locals used in actions
individual src : id
individual dst : id
after init {
cache(X).state := invalid;
cache(X).wait := none;
cache(X).invmarked := false;
dir.pending := false;
dir.dirty := false;
collecting := false;
net.get(X,Y) := false;
net.put(X,Y) := false;
net.getX(X,Y) := false;
net.putX(X,Y) := false;
net.fack(X,Y) := false;
net.shwb(X,Y) := false;
net.nak(X,Y) := false;
dir.list := false;
dir.head := false;
dir.shlist(X) := false;
rp_net(X) := false;
fwd_get := none;
wbnet.wb := false;
real_owner := home;
invnet(X) := false;
invack(X) := false;
nakc := false
}
action pi_Local_Get_dirty = {
assume cache(home).state = invalid;
assume cache(home).wait = none;
assume ~dir.pending;
assume dir.dirty;
dir.pending := true;
collecting := false;
cache(home).wait := get;
net.get(home,dir.hptr) := true;
requester := home
}
action pi_Local_Get = {
assume cache(home).state = invalid;
assume cache(home).wait = none;
assume ~dir.pending;
assume ~dir.dirty;
assume ~cache(home).invmarked;
dir.local_ := true;
cache(home).state := shared
}
# TODO: can this ever happen?
action pi_Local_Get_im = {
assume cache(home).state = invalid;
assume cache(home).wait = none;
assume ~dir.pending;
assume ~dir.dirty;
assume cache(home).invmarked;
cache(home).invmarked := false
}
action pi_Remote_Get = {
assume src ~= home;
assume cache(src).state = invalid;
assume cache(src).wait = none;
cache(src).wait := get;
net.get(src,home) := true;
src := *
}
action ni_Local_Get_nak = {
assume net.get(src,home);
assume home ~= src;
assume ~rp_net(src);
assume dir.pending | (dir.dirty & dir.local_ & cache(home).state~=exclusive) | (dir.dirty & ~dir.local_ & src = dir.hptr);
net.get(src,home) := false;
net.nak(home,src) := true
}
# action ni_Local_Get = {
# assume net.get(src,home);
# assume home ~= src;
# assume ~dir.pending & ~dir.dirty & ~ rp_net(src) & ~cache(src).invmarked;
# net.get(src,home) := false;
# net.put(home,src) := true;
# if (dir.head) {
# dir.list := true;
# dir.shlist(src) := true;
# dir.real := dir.shlist # what is this?
# }
# else {
# dir.head := true;
# dir.hptr := src
# }
# }
action ni_Local_Get = {
assume net.get(src,home);
assume home ~= src;
assume ~dir.pending & ~dir.dirty & ~ rp_net(src) & ~cache(src).invmarked;
net.get(src,home) := false;
net.put(home,src) := true;
dir.head := true;
dir.hptr := src;
dir.shlist(src) := true;
src := *
}
action ni_Local_Get_fwd = {
assume net.get(src,home);
assume home ~= src;
assume ~dir.pending & dir.dirty & ~ rp_net(src) & ~dir.local_ & src ~= dir.hptr;
net.get(src,home) := false;
dir.pending := true;
net.get(src,dir.hptr) := true;
src := *
}
action ni_Remote_Put = {
assume dst ~= home;
assume net.put(src,dst);
net.put(src,dst) := false;
cache(dst).wait := none;
cache(dst).state := shared;
src := *;
dst := *
}
# Non-deterministically drop a shared line from the cache. Send an rp message.
# informing the directory.
action pi_Remote_Replace = {
assume cache(src).state=shared & cache(src).wait=none & src ~= home;
cache(src).state := invalid;
rp_net(src) := true;
src := *
}
# Directory receives a replace message, removes sender from sharing list, assuming it is not head.
action ni_Replace_list = {
assume rp_net(src);
assume dir.hptr ~= src;
rp_net(src) := false;
dir.shlist(src) := false;
# dir.real(src) := false;
src := *
}
# Remote is invalid and wants an exclusive copy
action pi_Remote_GetX = {
assume cache(src).state=invalid & cache(src).wait=none & src ~= home;
cache(src).wait := getX;
net.getX(src,home) := true;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when no invalidation is needed, that is, there is no exclusive
# copy and either the sharing list is empty or it contains only the
# source.
action ni_Local_GetX = {
assume net.getX(src,home);
assume home ~= src;
assume ~dir.pending & ~dir.dirty;
assume ~dir.head | src = dir.hptr;
assume ~dir.head | ~dir.shlist(X) | X = src;
assume ~rp_net(src);
net.getX(src,home) := false;
dir.dirty := true;
dir.head := true;
dir.hptr := src;
dir.real(X) := X = src;
dir.shlist(X) := X = src;
net.putX(home,src) := true;
real_owner := src; # ghost
cache(home).state := invalid;
cache(home).invmarked := (cache(home).wait = get & dir.local_) | cache(home).invmarked;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when the request is nak'd
action ni_Local_GetX_nak = {
assume net.getX(src,home);
assume home ~= src;
assume dir.pending | dir.dirty & cache(home).state ~= exclusive | src = dir.hptr;
assume ~rp_net(src);
net.getX(src,home) := false;
net.nak(home,src) := true;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when the request is pended.
action ni_Local_GetX_pend = {
assume net.getX(src,home);
assume home ~= src;
assume ~dir.pending & dir.dirty & ~dir.local_ & src ~= dir.hptr;
assume ~rp_net(src);
net.getX(src,home) := false;
dir.pending := true;
collecting := false;
net.getX(src,dir.hptr) := true;
fwd_get := getX;
requester := src;
src := *
}
# Directory receives an exclusive request. This action handles the
# case when invalidations are sent out.
action ni_localGetX_inv = {
assume net.getX(src,home);
assume home ~= src;
assume ~dir.pending & ~dir.dirty & ~dir.local_;
assume dir.head;
assume src ~= dir.hptr | (dir.shlist(dst) & dst~=src);
assume ~rp_net(src);
net.getX(src,home) := false;
invnet(X) := X ~= home & X ~= src & dir.shlist(X);
collecting := true;
# m1 := m;
# last_other_invack := (dir.hptr ~= src) ? dir.hptr . {i . i in Proc, dir.shlist(i) & i~=src};
cache(home).invmarked := (cache(home).wait = get & dir.local_) | cache(home).invmarked;
dir.local_ := false;
dir.dirty := true;
dir.head := true;
dir.hptr := src;
dir.pending := true;
dir.real(X) := X ~= home & X ~= src & dir.shlist(X);
dir.shlist(X) := X = src;
net.putX(home,src) := true;
real_owner := src;
cache(home).state := invalid;
src := *;
dst := *
}
action ni_Remote_PutX = {
assume net.putX(src,dst);
assume dst~=home & cache(dst).wait = getX;
net.putX(src,dst) := false;
cache(dst).wait :=none;
cache(dst).invmarked := false;
cache(dst).state :=exclusive;
src := *;
dst := *
}
action pi_Remote_PutX = {
assume cache(src).state = exclusive & src ~= home; # cache(src).wait=none ???
cache(src).state := invalid;
wbnet.proc := src;
wbnet.wb := true;
src := *
}
action ni_Inv = {
assume invnet(dst) & dst~=home;
invnet(dst) := false;
invack(dst) := true;
cache(dst).invmarked := (cache(dst).wait = get) | cache(dst).invmarked;
cache(dst).state := invalid;
dst := *
}
action ni_InvAck = {
assume dir.pending & invack(src) & src~=home;
assume dir.real(dst) & dst ~= src;
invack(src) := false;
dir.real(src) := false;
# last_invack := src;
# last_other_invack := {i : i in Proc, dir.real(i) & i ~= src};
src := *;
dst := *
}
action ni_InvAck_last = {
assume dir.pending & invack(src) & src~=home;
assume ~dir.real(X) | X = src;
dir.pending := false;
collecting := false;
# m1 := undefined; ???
invack(src) := false;
dir.real(src) := false;
# last_invack := src;
if ( dir.local_ & ~ dir.dirty) {
dir.local_ := false
}
}
action ni_WB = {
assume wbnet.wb;
wbnet.wb := false;
dir.dirty := false;
dir.head := false;
dir.shlist(X) := false;
last_WB := wbnet.proc
}
action ni_Remote_GetX_nak = {
assume net.getX(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state ~= exclusive;
net.getX(src,dst) := false;
fwd_get := none;
# fwd_src := src;
nakc := true;
net.nak(dst,src) := true;
src := *;
dst := *
}
action ni_Remote_GetX_fwd = {
assume net.getX(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state = exclusive;
net.getX(src,dst) := false;
cache(dst).state := invalid;
fwd_get := none;
# fwd_src := src;
net.putX(dst,src) := true;
real_owner := src;
if src~=home {
net.fack(src,home) := true
};
src := *;
dst := *
}
action ni_FAck = {
assume net.fack(src,home);
net.fack(src,home) := false;
dir.pending := false;
if dir.dirty {
dir.hptr := src;
dir.shlist(X) := X = src
};
src := *
}
action ni_Remote_Get_nak = {
assume net.get(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state ~= exclusive;
net.get(src,dst) := false;
fwd_get := none;
# fwd_src := src;
nakc := true;
net.nak(dst,src) := true;
src := *;
dst := *
}
action ni_Remote_Get_fwd = {
assume net.get(src,dst);
assume dst ~=src & dst ~= home & cache(dst).state = exclusive;
net.get(src,dst) := false;
# assume ~cache(src).invmarked; TODO: ???
cache(dst).state := shared;
fwd_get := none;
# fwd_src := src;
net.put(dst,src) := true;
if src~=home {
real_owner := home;
net.shwb(src,home) := true
};
# shwb_src := dst;
src := *;
dst := *
}
action ni_ShWB = {
assume net.shwb(src,home);
net.shwb(src,home) := false;
dir.pending := false;
dir.dirty := false;
dir.shlist(src) := true;
dir.real(X) := dir.shlist(X);
# last_WB := shwb_src;
src := *
}
action ni_NAK_Clear = {
assume nakc;
dir.pending := false;
nakc := false
}
export pi_Local_Get_dirty
export pi_Local_Get
export pi_Local_Get_im
export pi_Remote_Get
export ni_Local_Get_nak
export ni_Local_Get
export ni_Local_Get_fwd
export ni_Remote_Put
export pi_Remote_Replace
export ni_Replace_list
export pi_Remote_GetX
export ni_Local_GetX
export ni_Local_GetX_nak
export ni_Local_GetX_pend
export ni_localGetX_inv
export ni_Remote_PutX
export pi_Remote_PutX
export ni_Inv
export ni_InvAck
export ni_InvAck_last
export ni_WB
export ni_Remote_GetX_nak
export ni_Remote_GetX_fwd
export ni_FAck
export ni_Remote_Get_nak
export ni_Remote_Get_fwd
export ni_ShWB
export ni_NAK_Clear
invariant [coherent1]
cache(X).state = exclusive -> X = real_owner
invariant [coherent2]
cache(X).state = exclusive & ~cache.invmarked(Y) -> cache(Y).state ~= shared
invariant [nodups]
cache(X).state = exclusive -> dir.dirty & ~wbnet.wb & ~net.shwb(Y,home)
invariant net.putX(X,Y) -> Y = real_owner & dir.dirty & ~wbnet.wb & ~net.shwb(Z,home) & cache(Z).state ~= exclusive
invariant net.shwb(Z,home) -> dir.dirty & dir.pending & ~collecting & ~wbnet.wb & ~net.putX(X,Y) & cache(X).state ~= exclusive & ~net.fack(X,home) & ~nakc & ~net.put(X,home)
invariant wbnet.wb -> dir.dirty & ~net.putX(X,Y) & ~net.shwb(Z,home) & cache(X).state ~= exclusive
invariant net.putX(X,Y) & net.putX(Z,Y) -> X = Z
invariant net.shwb(X,home) & net.shwb(Z,home) -> X = Z
invariant net.get(X,Y) -> ~net.putX(Z,X) & ~net.getX(X,Z)
invariant net.put(X,Y) & net.put(Z,Y) -> X = Z
invariant net.get(X,Y) & net.get(X,Z) -> Y = Z
invariant net.put(X,Y) -> ~net.get(Y,Z) & ~net.getX(Y,Z) & ~net.putX(Z,Y)
invariant (net.put(X,Y) | cache.state(Y) = shared) & ~cache.invmarked(Y)
-> dir.head & ~(dir.dirty & ~dir.pending)
& (dir.pending & ~collecting & (net.shwb(Y,home) | Y = home & ~cache.state(Y) = shared) | dir.shlist(Y))
& (dir.pending & collecting -> dir.real(Y))
& ~net.fack(Q,home) & ~nakc
& ~wbnet.wb & cache(Z).state ~= exclusive
& ~net.putX(Q,R)
invariant net.fack(X,home) -> dir.dirty & dir.pending & ~collecting & real_owner = X
invariant net.fack(X,home) & net.fack(Y,home) -> X = Y
invariant invnet(X) -> collecting & ~invack(X) & dir.real(X)
invariant invack(X) -> collecting & ~invnet(X) & dir.real(X) &
(cache.state(X) = invalid & ~net.put(Y,X) | cache.invmarked(X))
invariant collecting & cache.state(X) = shared & ~cache.invmarked(X) -> dir.real(X)
invariant collecting -> dir.pending
invariant nakc -> dir.pending & ~collecting & ~net.fack(Q,home)
invariant (net.getX(X,Y) | net.get(X,Y)) & Y ~= home ->
dir.head & dir.dirty & dir.pending & ~collecting & ~net.fack(Q,home)
& ~nakc & Y = real_owner & real_owner = dir.hptr
& ~((net.put(Q,R) | cache.state(R) = shared) & ~cache.invmarked(R))
& ~net.shwb(Q,home)
invariant ~((net.getX(X,Y) | net.get(X,Y)) & (net.getX(Z,Y) | net.get(Z,Y)) & X ~= Z & Y ~= home)
invariant dir.dirty & ~(dir.pending & ~collecting) -> real_owner = dir.hptr
invariant nakc -> real_owner = dir.hptr
invariant (net.get(X,Y) | net.put(Y,X)) -> cache.wait(X) = get
invariant (net.getX(X,Y) | net.putX(Y,X)) -> cache.wait(X) = getX
invariant cache.wait(X) ~= none -> cache.state(X) = invalid
invariant dir.dirty -> dir.head | dir.local_
invariant dir.pending & collecting -> ~dir.real(real_owner)
invariant net.getX(X,Y) -> ~net.putX(Z,X)
invariant net.getX(X,Y) & net.getX(X,Z) -> Y = Z
invariant rp_net(X) -> cache.state(X) = invalid & ~net.put(Y,X) & ~(net.get(X,Z) & Z ~= home)
& ~net.putX(Y,X) & ~(net.getX(X,Z) & Z ~= home)
invariant dir.head -> dir.shlist(dir.hptr)