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Overview
Comment: | Very rough beginning of a refactored 'varargs' pass |
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Timelines: | family | ancestors | descendants | both | notworking | kbk-refactor-varargs |
Files: | files | file ages | folders |
SHA3-256: |
7c9d400e5e7e22c778af26d006c14188 |
User & Date: | kbk 2018-12-27 19:44:51 |
Context
2018-12-27
| ||
19:47 | Add 'buiilder.tcl' inadvertently omitted from previous commit Closed-Leaf check-in: 2e3b3ea76f user: kbk tags: notworking, kbk-refactor-varargs | |
19:44 | Very rough beginning of a refactored 'varargs' pass check-in: 7c9d400e5e user: kbk tags: notworking, kbk-refactor-varargs | |
04:12 | Eliminate the 'isBoolean' instruction in favour of using the type checking machinery check-in: 0718166269 user: kbk tags: trunk | |
Changes
Changes to quadcode/duchain.tcl.
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if {[lindex $opd 0] in {"var" "temp"}} {
my addUse $opd $b
}
}
set bb [lindex $bbcontent $b]
lset bbcontent $b {}
lset bbcontent $b [linsert $bb[unset -nocomplain bb] $pc $q]
return
}
# quadcode::transformer method audit-duchain --
#
# Makes sure that the 'duchain' dictionary matches the actual uses
# of variables in the quadcode
|
| |
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if {[lindex $opd 0] in {"var" "temp"}} {
my addUse $opd $b
}
}
set bb [lindex $bbcontent $b]
lset bbcontent $b {}
lset bbcontent $b [linsert $bb[set bb {}] $pc $q]
return
}
# quadcode::transformer method audit-duchain --
#
# Makes sure that the 'duchain' dictionary matches the actual uses
# of variables in the quadcode
|
Changes to quadcode/invoke.tcl.
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# b - Basic block number of the 'invoke' instruction # pc - Program counter within the basic block # pc0 - Program counter of the start of the invocation sequence. $pc0 <= $pc # q - The 'invoke' instruction itself # cmd - The command being invoked # argl - The arglist from the 'invoke' instruction # cfin - The callframe that flows into the invocation sequence, or Nothing # cfout - The callframe that flows out of the invocation sequence, or # {} # invars - Dictionary whose keys are literal variable names and whose # values are the sources of variables that need to be copied # to the callframe prior to invocation # retval - Return value from the invocation # outvars - Dictionary whose keys are literal variable names and # whose values are the quadcode values that need to be # assigned from the callframe after the invocation # errexit - Basic block number to jump to on error exit # normexit - Basic block number to jump to on normal exit variable xfmr b pc q cmd argl \ pc0 cfin invars retval cfout outvars errexit normexit constructor {} { # Defer construction to an initialization method to avoid throwing # constructor errors. } ................................................................................ set pc $pc_ set bb [$xfmr getBasicBlock $b] set q [lindex $bb $pc] # Take apart the invocation set argl [lassign $q op cfo_invoke cfi_invoke cmd] if {$op ni {"invoke" "invokeExpanded"}} { error "cannot analyze: not an invocation." } # Find the input callframe and relevant input variables set pc0 $pc set cfin Nothing set invars {} if {$cfi_invoke ne "Nothing"} { set qb [lindex $bb [expr {$pc-1}]] if {[lindex $qb 0] eq "moveToCallFrame"} { if {[lindex $qb 1] ne $cfi_invoke} { error "cannot analyze: moveToCallFrame mislinked" } set varl [lassign $qb - - cfin] foreach {namelit source} $varl { if {[lindex $namelit 0] ne "literal"} { error "cannot analyze: name of input var not literal" } ................................................................................ } set pc0 [expr {$pc-1}] } } # Find the result value set retval $cfo_invoke if {[lindex $bb [incr pc] 0] eq "retrieveResult"} { set q2 [lindex $bb $pc] lassign $q2 - retval cf2 if {$cf2 ne $cfo_invoke} { error "cannot analyze: retrieveResult mislinked" } } else { incr pc -1 } # Find the output callframe set cfout $cfo_invoke if {[lindex $bb [incr pc] 0] eq "extractCallFrame"} { set q2 [lindex $bb $pc] lassign $q2 - cfout cf2 if {$cf2 ne $cfo_invoke} { error "cannot analyze: extractCallFrame mislinked" } } else { incr pc -1 } # Find the output variables ................................................................................ } else { error "cannot analyze: basic block does not end with a jump" } return } # quadcode::invocationSequence method cfin -- # # Returns the starting callframe for an invocation sequence oo::define quadcode::invocationSequence method cfin {} { return $cfin } # quadcode::invocationSequence method cfout -- # # Returns the ending callframe for an invocation sequence oo::define quadcode::invocationSequence method cfout {} { return $cfout } # quadcode::invocationSequence method errexit -- # # Returns the error exit block number for an invocation sequence oo::define quadcode::invocationSequence method errexit {} { return $errexit ................................................................................ # quadcode::invocationSequence method pc0 -- # # Returns the starting program counter for an invocation sequence oo::define quadcode::invocationSequence method pc0 {} { return $pc0 } # quadcode::invocationSequence method retval -- # # Returns the return value for an invocation sequence oo::define quadcode::invocationSequence method retval {} { return $retval } |
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# b - Basic block number of the 'invoke' instruction # pc - Program counter within the basic block # pc0 - Program counter of the start of the invocation sequence. $pc0 <= $pc # q - The 'invoke' instruction itself # cmd - The command being invoked # argl - The arglist from the 'invoke' instruction # cfin - The callframe that flows into the invocation sequence, or Nothing # cfin_invoke - The callframe that is input to the 'invoke' or # 'invokeExpanded' instruction, or Nothing. # res_invoke - The result of 'invoke' or 'invokeExpanded' # cfout - The callframe that flows out of the invocation sequence, or # {} # invars - Dictionary whose keys are literal variable names and whose # values are the sources of variables that need to be copied # to the callframe prior to invocation # retval - Return value from the invocation # outvars - Dictionary whose keys are literal variable names and # whose values are the quadcode values that need to be # assigned from the callframe after the invocation # errexit - Basic block number to jump to on error exit # normexit - Basic block number to jump to on normal exit variable xfmr b pc q cmd res_invoke cfin_invoke argl \ pc0 cfin invars retval cfout outvars errexit normexit constructor {} { # Defer construction to an initialization method to avoid throwing # constructor errors. } ................................................................................ set pc $pc_ set bb [$xfmr getBasicBlock $b] set q [lindex $bb $pc] # Take apart the invocation set argl [lassign $q op res_invoke cfin_invoke cmd] if {$op ni {"invoke" "invokeExpanded"}} { error "cannot analyze: not an invocation." } # Find the input callframe and relevant input variables set pc0 $pc set cfin Nothing set invars {} if {$cfin_invoke ne "Nothing"} { set qb [lindex $bb [expr {$pc-1}]] if {[lindex $qb 0] eq "moveToCallFrame"} { if {[lindex $qb 1] ne $cfin_invoke} { error "cannot analyze: moveToCallFrame mislinked" } set varl [lassign $qb - - cfin] foreach {namelit source} $varl { if {[lindex $namelit 0] ne "literal"} { error "cannot analyze: name of input var not literal" } ................................................................................ } set pc0 [expr {$pc-1}] } } # Find the result value set retval $res_invoke if {[lindex $bb [incr pc] 0] eq "retrieveResult"} { set q2 [lindex $bb $pc] lassign $q2 - retval cf2 if {$cf2 ne $res_invoke} { error "cannot analyze: retrieveResult mislinked" } } else { incr pc -1 } # Find the output callframe set cfout $res_invoke if {[lindex $bb [incr pc] 0] eq "extractCallFrame"} { set q2 [lindex $bb $pc] lassign $q2 - cfout cf2 if {$cf2 ne $res_invoke} { error "cannot analyze: extractCallFrame mislinked" } } else { incr pc -1 } # Find the output variables ................................................................................ } else { error "cannot analyze: basic block does not end with a jump" } return } # quadcode::invocationSequence method arginfo -- # # Queries [info args] for the invoked command. # # Results: # Returns an ordered pair consisting of {1 result} if the args # are known, or {0 {}} otherwise. The value of 'result' in the # ordered pair is the result of [info args] for the given command. oo::define quadcode::invocationSequence method arginfo {} { lassign [my cmd] status cmdName if {!$status || [catch {info args $cmdName} arginfo]} { return {0 {}} } return [list 1 $arginfo] } # quadcode::invocationSequence method b -- # # Returns the basic block number of an invocation sequence oo::define quadcode::invocationSequence method b {} { return $b } # quadcode::invocationSequence method cfin -- # # Returns the starting callframe for an invocation sequence oo::define quadcode::invocationSequence method cfin {} { return $cfin } # quadcode::invocationSequence method cfin_invoke -- # # Returns the callframe from the 'invoke' instruction in an # invocation sequence oo::define quadcode::invocationSequence method cfin_invoke {} { return $cfin_invoke } # quadcode::invocationSequence method cfout -- # # Returns the ending callframe for an invocation sequence oo::define quadcode::invocationSequence method cfout {} { return $cfout } # quadcode::invocationSequence method cmd -- # # Queries the name of the invoked command. # # Results: # # Returns an ordered pair that is {1 commandName} if the sequence # invokes a known command, and {0 {}} if the sequence does not # invoke a known command. oo::define quadcode::invocationSequence method cmd {} { if {[lindex $cmd 0] eq "literal"} { return [list 1 [lindex $cmd 1]] } else { return {0 {}} } } # quadcode::invocation sequence method argl -- # # Returns the argument list of the invoked command. oo::define quadcode::invocationSequence method argl {} { return $argl } # quadcode::invocationSequence method errexit -- # # Returns the error exit block number for an invocation sequence oo::define quadcode::invocationSequence method errexit {} { return $errexit ................................................................................ # quadcode::invocationSequence method pc0 -- # # Returns the starting program counter for an invocation sequence oo::define quadcode::invocationSequence method pc0 {} { return $pc0 } # quadcode::invocationSequence method res_invoke -- # # Returns the result of the 'invoke' or 'invokeExpanded' in # an invocation sequence oo::define quadcode::invocationSequence method res_invoke {} { return $res_invoke } # quadcode::invocationSequence method retval -- # # Returns the return value for an invocation sequence oo::define quadcode::invocationSequence method retval {} { return $retval } |
Changes to quadcode/narrow.tcl.
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# Inserts narrowing operations in the quadcode. # # Results: # None. # # Preconditions: # # The program must be in SSA form, and the DJ graph (bbidom, bbkids, # bbnlevels, bblevel) must be accurate. ud- and du-chains must be # present. # # Side effects: # # Wherever a conditional branch tests the data type or existence of # a value, narrowing instructions are inserted in the quadcode to # mark that the value is of the required type. # # The ud- and du-chains are updated as the narrowing instructions # are inserted, and phi instructions for the controlled variables # are inserted on the iterated dominance frontier. The phi's may # turn out to be useless, in which case a subsequent 'uselessphis' # pass will clean them up. # # All of the operations introduced in this pass consist of introducing # new quads of the form # v2 := some_narrowing_operation(v1) # where v2 is a new variable instance, followed by fixup to the SSA diagram. oo::define quadcode::transformer method narrow {} { upvar #0 quadcode::dataType::IMPURE IMPURE my debug-narrow { puts "before inserting narrowing operations:" my dump-bb ................................................................................ set falseBranch [lindex $bb end 1 1] } else { set falseBranch [lindex $q 1 1] set trueBranch [lindex $bb end 1 1] } # These operations may narrow if the defining instruction # is 'exists' or 'instanceOf' # The assignment appears at 'dpc' within basic block 'dbb' # and consists of the quadcode statement 'dquad'. lassign [my findDef [lindex $q 2]] dbb dpc dquad set dop [lindex $dquad 0 0] switch -exact -- $dop { arrayExists { set dvar [lindex $dquad 2] if {[lindex $dvar 0] ni {var temp}} continue my insertQuad $trueBranch 0 \ [list extractArray $dvar $dvar] my insertQuad $falseBranch 0 \ [list extractScalar $dvar $dvar] my narrow_repairSSA $dvar $trueBranch $falseBranch } exists { set dvar [lindex $dquad 2] if {[lindex $dvar 0] ni {var temp}} continue my insertQuad $trueBranch 0 \ [list extractExists $dvar $dvar] my insertQuad $falseBranch 0 \ [list unset $dvar] my narrow_repairSSA $dvar $trueBranch $falseBranch } instanceOf { set typecode [lindex $dquad 0 1] set typename [lindex $dquad 0 2] set dvar [lindex $dquad 2] if {[lindex $dvar 0] ni {var temp}} continue ................................................................................ set notname [nameOfType $nottype] my insertQuad $trueBranch 0 \ [list [list narrowToType $typecode $typename] \ $dvar $dvar] my insertQuad $falseBranch 0 \ [list [list narrowToType $nottype $notname] \ $dvar $dvar] my narrow_repairSSA $dvar $trueBranch $falseBranch } } } jumpMaybe { set okBranch [lindex $bb end 1 1] set failBranch [lindex $q 1 1] ................................................................................ my debug-narrow { puts " $bbindex:end-1: $q" puts " $okBranch:0: [list copy $var $var]" puts " $failBranch:0: [list extractFail $var $var]" } my insertQuad $okBranch 0 [list copy $var $var] my insertQuad $failBranch 0 [list extractFail $var $var] my narrow_repairSSA $var $okBranch $failBranch } } } my debug-narrow { puts "after inserting narrowing operations:" my dump-bb } } # quadcode::transformer method narrow_repairSSA -- # # Repairs the SSA property after introducing a narrowing operation # on a variable. # # Parameters: # v - Variable that has been narrowed and now has duplicate assignments # b1 - First block containing a new assignment to v # b2 - Second block containing a new assignment to v # # Results: # None. # # Side effects: # The SSA property is restored by giving new names to the assignments to # $v, and updating the uses, possibly introducing new phi operations. oo::define quadcode::transformer method narrow_repairSSA {v b1 b2} { set d [dict create [dict get $udchain $v] 1] dict incr d $b1 dict incr d $b2 my repairSSAVariable $v $d } # quadcode::transformer method cleanupNarrow -- # # Removes narrowing instructions that are no longer relevant # # Preconditions: # The 'narrow' pass must have run to insert narrowing instructions, |
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# Inserts narrowing operations in the quadcode. # # Results: # None. # # Preconditions: # # The program must be deconstructed from SSA form. ud- and du-chains # must reflect the state of the program before deconstruction. One # round of copy propagation must have been done. # # Side effects: # # Wherever a conditional branch tests the data type or existence of # a value, narrowing instructions are inserted in the quadcode to # mark that the value is of the required type. # # All of the operations introduced in this pass consist of introducing # new quads of the form # v := some_narrowing_operation(v) # where v is the value being tested (possibly indirectly) by the conditional # jump. oo::define quadcode::transformer method narrow {} { upvar #0 quadcode::dataType::IMPURE IMPURE my debug-narrow { puts "before inserting narrowing operations:" my dump-bb ................................................................................ set falseBranch [lindex $bb end 1 1] } else { set falseBranch [lindex $q 1 1] set trueBranch [lindex $bb end 1 1] } # These operations may narrow if the defining instruction # is 'arrayExists', 'exists' or 'instanceOf' # The assignment appears at 'dpc' within basic block 'dbb' # and consists of the quadcode statement 'dquad'. if {[catch { # Finding the definition will throw an error at a phi. # The error can be ignored, because phi is not 'arrayExists' # 'exists' or 'instanceOf'. my findDef [lindex $q 2] } result]} continue lassign $result dbb dpc dquad set dop [lindex $dquad 0 0] switch -exact -- $dop { arrayExists { set dvar [lindex $dquad 2] if {[lindex $dvar 0] ni {var temp}} continue my insertQuad $trueBranch 0 \ [list extractArray $dvar $dvar] my insertQuad $falseBranch 0 \ [list extractScalar $dvar $dvar] my debug-narrow { puts "$trueBranch:0:\ [lindex $bbcontent $trueBranch 0]" puts "$falseBranch:0:\ [lindex $bbcontent $falseBranch 0]" } } exists { set dvar [lindex $dquad 2] if {[lindex $dvar 0] ni {var temp}} continue my insertQuad $trueBranch 0 \ [list extractExists $dvar $dvar] my insertQuad $falseBranch 0 \ [list unset $dvar] my debug-narrow { puts "$trueBranch:0:\ [lindex $bbcontent $trueBranch 0]" puts "$falseBranch:0:\ [lindex $bbcontent $falseBranch 0]" } } instanceOf { set typecode [lindex $dquad 0 1] set typename [lindex $dquad 0 2] set dvar [lindex $dquad 2] if {[lindex $dvar 0] ni {var temp}} continue ................................................................................ set notname [nameOfType $nottype] my insertQuad $trueBranch 0 \ [list [list narrowToType $typecode $typename] \ $dvar $dvar] my insertQuad $falseBranch 0 \ [list [list narrowToType $nottype $notname] \ $dvar $dvar] my debug-narrow { puts "$trueBranch:0:\ [lindex $bbcontent $trueBranch 0]" puts "$falseBranch:0:\ [lindex $bbcontent $falseBranch 0]" } } } } jumpMaybe { set okBranch [lindex $bb end 1 1] set failBranch [lindex $q 1 1] ................................................................................ my debug-narrow { puts " $bbindex:end-1: $q" puts " $okBranch:0: [list copy $var $var]" puts " $failBranch:0: [list extractFail $var $var]" } my insertQuad $okBranch 0 [list copy $var $var] my insertQuad $failBranch 0 [list extractFail $var $var] } } } my debug-narrow { puts "after inserting narrowing operations:" my dump-bb } } # quadcode::transformer method cleanupNarrow -- # # Removes narrowing instructions that are no longer relevant # # Preconditions: # The 'narrow' pass must have run to insert narrowing instructions, |
Changes to quadcode/transformer.tcl.
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copyprop
fqcmd
varargs
deadbb
bbidom
bblevel
rewriteParamChecks
narrow
} {
lappend timings $pass [lindex [time [list my $pass]] 0]
my debug-audit {
my audit-duchain $pass
my audit-phis $pass
}
}
my debug-timings {
................................................................................
# types comes first - other modules' initialization can depend on it
source [file join $quadcode::libdir types.tcl]
source [file join $quadcode::libdir abbreviate.tcl]
source [file join $quadcode::libdir aliases.tcl]
source [file join $quadcode::libdir bb.tcl]
source [file join $quadcode::libdir bytecode.tcl]
source [file join $quadcode::libdir callframe.tcl]
source [file join $quadcode::libdir constfold.tcl]
source [file join $quadcode::libdir constjump.tcl]
source [file join $quadcode::libdir copyprop.tcl]
source [file join $quadcode::libdir dbginfo.tcl]
source [file join $quadcode::libdir deadcode.tcl]
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copyprop fqcmd varargs deadbb bbidom bblevel rewriteParamChecks deconstructSSA narrow ssa ud_du_chain copyprop } { my debug-transform { puts "Run: $pass" } lappend timings $pass [lindex [time [list my $pass]] 0] my debug-audit { my audit-duchain $pass my audit-phis $pass } } my debug-timings { ................................................................................ # types comes first - other modules' initialization can depend on it source [file join $quadcode::libdir types.tcl] source [file join $quadcode::libdir abbreviate.tcl] source [file join $quadcode::libdir aliases.tcl] source [file join $quadcode::libdir bb.tcl] source [file join $quadcode::libdir builder.tcl] source [file join $quadcode::libdir bytecode.tcl] source [file join $quadcode::libdir callframe.tcl] source [file join $quadcode::libdir constfold.tcl] source [file join $quadcode::libdir constjump.tcl] source [file join $quadcode::libdir copyprop.tcl] source [file join $quadcode::libdir dbginfo.tcl] source [file join $quadcode::libdir deadcode.tcl] |
Changes to quadcode/varargs.tcl.
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set pc -1 foreach q $bb { incr pc # At this point in optimization, all invokes are part of a # sequence that is followed within a few instructions by a # jumpMaybe, so there can never be more than one in a basic # block. Since rewriting invocations can peform major surgery # on the program, simply call out to the appropriate handling # routine and 'break' to the next basic block. switch -exact [lindex $q 0] { "invoke" - "invokeExpanded" { my debug-varargs { puts "varargs: examine $b:$pc: $q" } my varargsRewriteInvoke $b $pc $q break } } } } my debug-varargs { puts "After variadic call replacement:" my dump-bb } } # quadcode::transformer method varargsRewriteInvoke -- # # Rewrites 'invoke' and 'invokeExpanded' instructions to accommodate # compiled procs that accept variable numbers of arguments without going # through a call thunk or losing data type information. # # Parameters: # b - Basic block number ................................................................................ # # Results: # None. # # Side effects: # Rewrites the instruction and 'expand' instructions that it # uses. Updates ud- and du-chains. # # We actually have to work on a whole code burst here. What we need to # consider is a sequence like # # (may be omitted) moveToCallFrame cf1 cf0 name0 var0 name1 var1 ... # invokeExpanded res0 cf1 command args... # (may be omitted) retrieveResult res1 res0 # (may be omitted) extractCallframe cf2 res0 # (zero or more) moveFromCallFrame var cf2 name # jumpMaybe catchHandler res1 # jump normalReturn # # The reason is that there is a considerable amount of logic in # optimization and code generation that isn't prepared to have # a moveFromCallFrame's callframe argument be the result of a phi. # (There are places where the optimizer needs to track moveFromCallFrame # back to a unique 'invoke' or other callframe-altering operation). # # What we want the result to look like: # # (... code to unpack arguments. Normal exit is bbNormal. Wrong # number of args exit is bbWrong.) # # bbNormal: # moveToCallFrame cf3 cf0 name0 var0 name1 var1 ... # invoke res2 cf3 command args ... # retrieveResult res3 res2 # extractCallframe cf4 res3 # moveFromCallFrame var' cf4 name (zero or more) # jumpMaybe bb0 res3 # jump bb1 # # bbWrong: # (no need for moveToCallFrame) # invokeExpanded res4 Nothing command originalArgs... # (no need for callframe manipulation) # jumpMaybe bb0 res4 # jump bb1 (this jump is never taken, the 'invokeExpanded' always errors # out in this case). # # bb0: # cf2* = phi(cf4 [bbNormal], cf0 [bbWrong]) # res1* = phi(res3 [bbNormal], res4 [bbWrong]) # zero or more: # var* = phi(var' [bbnormal], var' reaching def [bbWrong]) # jump catchHandler # # bb1: # cf2** = phi(cf4 [bbNormal], cf0 [bbWrong]) # res1** = phi(res3 [bbNormal], res4 [bbWrong]) # zero or more: # var** = phi(var' [bbnormal], var' reaching def [bbWrong]) # jump normalReturn # # Then, cf2*/cf2**, res1*/res1** and all instances of var*/var** become and # are treated as duplicate definitions for repairSSAVariable. # # Note that the reaching definition of each variable in 'moveFromCallFrame' # is easily obtained, because it has to be in the 'moveToCallFrame' that # precedes the 'invokeExpanded'. oo::define quadcode::transformer method varargsRewriteInvoke {b pc q} { set newqds {} # Take apart the quad set argv [lassign $q opcode cfout cfin calleeLit] # We care only about 'invokeExpanded' operations where the procedure # name is known a priori, the expected args are known, and # the target procedure is compiled. # TODO: We also care about {*} expansion passed to non-variadic # Core commands. That will give us information about # their stack effects. if {[lindex $calleeLit 0] ne "literal" || [catch { set callee [lindex $calleeLit 1] info args $callee } arginfo] || ![$specializer compiling $callee]} { return } my debug-varargs { puts "[my full-name]: $b:$pc: $q" } # Analyze the codeburst that carries out the 'invokeExpanded'. # This codeburst will run from the 'moveToCallFrame' preceding # the invocation out to the end of the basic block. # We will be rewriting it. set call [::quadcode::invocationSequence new] trace add variable call unset [list $call destroy] $call analyze [self] $b $pc # We are going to be doing major surgery on the basic block. # Remove the 'invokeExpanded' and all following instructions # from the block. Unlink the block from its successors, and # remove ud- and du-chaining for the removed instructions. set bb [my varargsUnlinkTail $b [$call pc0]] # Create the basic blocks for the actual invocation sequences. We make # them in advance to avoid backpatching. # Blocks 'err0b', 'norm0b', 'err1b' and 'norm1b' will be empty and are # present in order to split critical edges. set norm0b [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set err0b [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set notokb [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set norm1b [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set err1b [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set normb [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set normphis {} set errorb [llength $bbcontent] lappend bbcontent {}; lappend bbpred {} set errorphis {} # Create the first part of the 'invoke' instruction set invokeres [my newVarInstance $cfin] set newq [list invoke $invokeres $cfin $calleeLit] # Generate code for the 'wrong # args' case set notokbb {} set invexpres [my newVarInstance [$call retval]] foreach qq [my varargsEmitWrongArgs $invexpres {} Nothing $calleeLit] { my varargsEmitAndTrack $notokb notokbb $qq } dict set normphis [$call retval] [list bb $norm1b] $invexpres dict set errorphis [$call retval] [list bb $err1b] $invexpres dict set normphis [$call cfout] [list bb $norm1b] [$call cfin] dict set errorphis [$call cfout] [list bb $err1b] [$call cfin] my varargsEmitAndTrack $notokb notokbb \ [list jumpMaybe [list bb $err1b] $invexpres] my varargsEmitAndTrack $notokb notokbb [list jump [list bb $norm1b]] lset bbcontent $notokb $notokbb # Split the critical edges foreach {edge target} [list $norm0b $normb $err0b $errorb \ $norm1b $normb $err1b $errorb] { set splitbb {} my varargsEmitAndTrack $edge splitbb [list jump [list bb $target]] lset bbcontent $edge $splitbb } # Now start the parameter checking logic set nPlainParams [llength $arginfo] set haveargs 0 if {[lindex $arginfo end] eq "args"} { set haveargs 1 incr nPlainParams -1 } # Start by matching off non-expanded args with parameters in the callee set pos 0 while {$pos < $nPlainParams} { if {[my varargsNonExpandedArgument newq $arginfo $pos $q]} break incr pos } # Concatenate the remaining args into a list. 'listLoc' will # be the name of the object that holds the list. my debug-varargs { puts "varargs: $b:$pc: $q:\n\ \ Matched leading non-expanded args.\ $pos of $nPlainParams plain params" } set tempIndex -1 set listLoc [my varargsExpandFixed bb tempIndex pos $b $q] # We are going to need the length of the list, so # extract that now. (If it turns out somehow that we # don't use it, 'deadvars' will get rid of this, anyway.) set lenLoc1 [my newVarInstance [list temp [incr tempIndex]]] set lenLoc [my newVarInstance [list temp $tempIndex]] my varargsEmitAndTrack $b bb [list listLength $lenLoc1 $listLoc] my varargsEmitAndTrack $b bb [list extractMaybe $lenLoc $lenLoc1] # Count the mandatory args set firstMandatory $pos while {$pos < $nPlainParams} { if {[info default $callee [lindex $arginfo $pos] defaultVal]} { break ................................................................................ set nMandatory 0 if {$firstOptional > $firstMandatory} { # Make code to check length of arg list, starting a # new basic block set nMandatory [expr {$firstOptional - $firstMandatory}] set b [my varargsCheckEnough $b $bb $lenLoc $compTemp \ $nMandatory $notokb] set bb {} # Make code to transfer mandatory args my varargsUnpackMandatory tempIndex bb newq $b $listLoc $nMandatory } # Now we have the parameters that have default values. set j $nMandatory if {$nPlainParams > $firstOptional} { ................................................................................ set optInfo {} set finishB [llength $bbcontent] lappend bbcontent {} lappend bbpred {} set i $firstOptional while {$i < $nPlainParams} { info default $callee [lindex $arginfo $i] defaultVal lassign [my varargsUnpackOptional tempIndex b bb \ $finishB $compTemp $listLoc $lenLoc $j] \ fromBlock argLoc lappend optInfo [list $fromBlock $defaultVal $argLoc] incr i incr j } # Close out the last basic block, switch to the 'finish' block # and emit 'phi' instructions to get the correct parameter set my varargsFinishOptional b bb newq $finishB $optInfo } # If the procedure has 'args', then fill it in with the remainder of the # arg list. if {$haveargs} { my varargsDoArgs tempIndex $b bb newq $listLoc $j } else { my varargsCheckTooMany b bb $lenLoc $compTemp $j $notokb } # Create the normal invocation sequence. # 1. Create moveToCallFrame set cfin [$call cfin] set invars [$call invars] if {[$call pc0] < $pc} { set cf2 [my newVarInstance $cfin] set q2 [list moveToCallFrame $cf2 $cfin] dict for {vname val} $invars { lappend q2 [list literal $vname] $val } my varargsEmitAndTrack $b bb $q2 set cfin $cf2 lset newq 2 $cfin } # 2. Emit the call as rewritten my varargsEmitAndTrack $b bb $newq # 3. Make the 'retrieveResult' set okresult [my newVarInstance [$call retval]] my varargsEmitAndTrack $b bb [list retrieveResult $okresult $invokeres] dict set normphis [$call retval] [list bb $norm0b] $okresult dict set errorphis [$call retval] [list bb $err0b] $okresult # 4. Make the 'extractCallFrame' set okcf [my newVarInstance [$call cfout]] my varargsEmitAndTrack $b bb [list extractCallFrame $okcf $invokeres] dict set normphis [$call cfout] [list bb $norm0b] $okcf dict set errorphis [$call cfout] [list bb $err0b] $okcf # 5. Make 'moveFromCallFrame' for all output values dict for {vname outval} [$call outvars] { set okval [my newVarInstance $outval] my varargsEmitAndTrack $b bb \ [list moveFromCallFrame $okval $okcf [list literal $vname]] dict set normphis $outval [list bb $norm0b] $okval dict set errorphis $outval [list bb $err0b] $okval set notokval [dict get [$call invars] $vname] dict set normphis $outval [list bb $norm1b] $notokval dict set errorphis $outval [list bb $err1b] $notokval } # 6. Make the terminal jumps my varargsEmitAndTrack $b bb [list jumpMaybe [list bb $err0b] $okresult] my varargsEmitAndTrack $b bb [list jump [list bb $norm0b]] # Emit the final basic block rewrite lset bbcontent $b $bb # toRepair will have the variables that have to be fixed up by # repairSSAVariable after this stuff runs ................................................................................ foreach {v sources} $normphis { set val 0 if {[dict exists $toRepair $v $normb]} { set val [dict get $toRepair $v $normb] } incr val dict set toRepair $v $normb $val my varargsEmitAndTrack $normb normbb [list phi $v {*}$sources] } my varargsEmitAndTrack $normb normbb [list jump [list bb [$call normexit]]] lset bbcontent $normb $normbb # Make the block for the error exit set errorbb {} foreach {v sources} $errorphis { set val 0 if {[dict exists $toRepair $v $errorb]} { set val [dict get $toRepair $v $errorb] } incr val dict set toRepair $v $errorb $val my varargsEmitAndTrack $errorb errorbb [list phi $v {*}$sources] } my varargsEmitAndTrack $errorb errorbb [list jump [list bb [$call errexit]]] lset bbcontent $errorb $errorbb # Restore dominance relationships my bbidom; my bblevel my debug-varargs { puts "Before repairing SSA relationships:" ................................................................................ } my debug-varargs { puts "After repairing SSA relationships:" my dump-bb } return } # quadcode::transformer method varargsUnlinkTail -- # # Takes the last few instructions of a basic block and removes # them temporarily, unlinking the block from its successors and # the instructions from their ud- and du-chains. # # Parameters: # b - Number of the basic block # pc - Program counter of the first instruction being deleted # # Results: # Returns the partial basic block that remains # # Side effects: # Linkages are destroyed. oo::define quadcode::transformer method varargsUnlinkTail {b pc} { set bb [lindex $bbcontent $b] set head [lrange $bb 0 [expr {$pc-1}]] set tail [lrange $bb $pc end] foreach q $tail { if {[lindex $q 1 0] in {"temp" "var"}} { dict unset udchain [lindex $q 1] } foreach arg [lrange $q 2 end] { if {[lindex $arg 0] in {"temp" "var"}} { my removeUse $arg $b } } } foreach b2 [my bbsucc $b] { my removePred $b2 $b } lset bbcontent $b $head return $head } # quadcode::transformer method varargsNonExpandedArgument -- # # Transfer a leading non-expanded argument into a quad # under construction when rewriting 'invokeExpanded' # # Parameters: # newqVar - Name of a variable in caller's scope storing the # plain 'invoke' operation under construction # arginfo - Result of [info args] against the invoked proc # pos - Position of the argument (0 = first) in the argument list # q - Quadruple under construction # # Results: # Returns 0 if the parameter was transferred, 1 if we are at the # end of the possible static transfers. oo::define quadcode::transformer method \ varargsNonExpandedArgument {newqVar arginfo pos q} { upvar 1 $newqVar newq set param [lindex $arginfo $pos] set arg [lindex $q [expr {4 + $pos}]] switch -exact -- [lindex $arg 0] { "literal" { } "temp" - "var" { lassign [my findDef $arg] defb defpc defstmt if {[lindex $defstmt 0] eq "expand"} { return 1 } } default { return 1 } } lappend newq $arg return 0 } # quadcode::transformer method varargsExpandFixed -- # # Takes the non-fixed-position arguments of 'invokeExpanded' # and emits code to make them into a list. # # Parameters: # bbVar - Variable in caller holding the basic block under construction # tempIdxVar - Variable in caller holding the number of the last # temporary allocated. # posVar - Position in the parameter list where the list construction # should begin. # b - Basic block number of the block under construction # q - 'invokeExpanded' instruction being deconstructed # # Results: # # Returns the name of a variable, temporary or literal that holds the # expanded list. oo::define quadcode::transformer method \ varargsExpandFixed {bbVar tempIdxVar posVar b q} { upvar 1 $bbVar bb $tempIdxVar tempIndex $posVar pos set listTemp [list temp [incr tempIndex]] # Handle the first arg. Since 'invokeExpanded' always # has at least one expanded arg, there has to be a first # arg. if {4 + $pos >= [llength $q]} { set listLoc "literal {}" } else { set arg [lindex $q [expr {4 + $pos}]] switch -exact -- [lindex $arg 0] { "literal" { set listLoc [my newVarInstance $listTemp] my varargsEmitAndTrack $b bb [list list $listLoc $arg] } "temp" - "var" { lassign [my findDef $arg] defb defpc defstmt if {[lindex $defstmt 0] eq "expand"} { set listLoc [lindex $defstmt 2] } else { set listLoc [my newVarInstance $listTemp] my varargsEmitAndTrack $b bb [list list $listLoc $arg] } } } } # listLoc now is holding the location of the list under # construction. Concatenate the remaining params onto it. foreach arg [lrange $q [expr {5 + $pos}] end] { # Do we need to expand this arg? switch -exact -- [lindex $arg 0] { "literal" { set op listAppend } "temp" - "var" { lassign [my findDef $arg] defb defpc defstmt if {[lindex $defstmt 0] eq "expand"} { set op listConcat } else { set op listAppend } } } # Make variable to hold Maybe result from the concatenation, # and emit the concatenation. # This can't fail, $listTemp is known to be a list set nloc [my newVarInstance $listTemp] my varargsEmitAndTrack $b bb [list $op $nloc $listLoc $arg] # extract the result from the Maybe set listLoc [my newVarInstance $listTemp] my varargsEmitAndTrack $b bb [list extractMaybe $listLoc $nloc] } return $listLoc } # quadcode::transformer method varargsCheckEnough -- # # Emits code to check for too few args passed to invokeExpanded # # Parameters: # b - Basic block number under construction # bb - Instructions in the block # lenLoc - Location holding the length of the arg list ................................................................................ # compTemp - Temporary variable name to use for comparison # nMandatory - Number of mandatory args still unpaired # errorB - Basic block to jump to if too few args # # Results: # Returns the new basic block number; this method ends the block. oo::define quadcode::transformer method varargsCheckEnough {b bb lenLoc compTemp nMandatory errorB} { # Emit {$nMandatory > $lenLoc} set compLoc [my newVarInstance $compTemp] my varargsEmitAndTrack $b bb \ [list gt $compLoc [list literal $nMandatory] $lenLoc] # Emit jumpTrue to the error block. This has to go through an # intermediate block because it will be a critical edge otherwise. # Emit jump to the following block set intb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} set newb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my varargsEmitAndTrack $b bb [list jumpTrue [list bb $intb] $compLoc] my varargsEmitAndTrack $b bb [list jump [list bb $newb]] lset bbcontent $b $bb set bb {} # Emit the intermediate jump my varargsEmitAndTrack $intb bb [list jump [list bb $errorB]] lset bbcontent $intb $bb set bb {} return $newb } # quadcode::transformer method varargsUnpackMandatory -- # # Unpacks the mandatory args to a proc from the list created # by argument expansion # # Parameters; # tempIdxVar - Variable in caller's scope containing the last # allocated temporary ................................................................................ # # Results: # None. # # Side effects: # Emits code to unpack the mandatory parameters oo::define quadcode::transformer method varargsUnpackMandatory {tempIdxVar bbVar newqVar b listLoc nMandatory} { upvar 1 $tempIdxVar tempIdx $bbVar bb $newqVar newq for {set i 0} {$i < $nMandatory} {incr i} { # Emit the 'listIndex' instruction for one arg. It can't fail # because we know we have a list set argTemp [list temp [incr tempIdx]] set argLoc [my newVarInstance $argTemp] my varargsEmitAndTrack $b bb \ [list listIndex $argLoc $listLoc [list literal $i]] # Emit the 'extractMaybe' to get the arg from the Maybe # result of 'listIndex' set argLoc2 [my newVarInstance $argTemp] my varargsEmitAndTrack $b bb [list extractMaybe $argLoc2 $argLoc] # Put the extracted arg on the 'invoke' instruction lappend newq $argLoc2 } } # quadcode::transformer method varargsUnpackOptional -- # # Emits code to unpack one optional parameter in an invokeExpanded # # Parameters: # tempIdxVar - Variable holding the index of the last used temporary # bVar - Variable holding the current basic block number # bbVar - Variable holding the content of the basic block under ................................................................................ # to the finish if the parameter is not supplied and the # location of a temporary holding the unpacked value if it is. # # Side effects: # Emits code to unpack one value, or jump to the finish block if # there is nothing to unpack. oo::define quadcode::transformer method varargsUnpackOptional {tempIdxVar bVar bbVar finishB compTemp listLoc lenLoc j} { upvar 1 $tempIdxVar tempIndex $bVar b $bbVar bb set pos [list literal $j] set compLoc [my newVarInstance $compTemp] set argTemp [list temp [incr tempIndex]] set argLoc1 [my newVarInstance $argTemp] set argLoc2 [my newVarInstance $argTemp] # Emit the list length comparison my varargsEmitAndTrack $b bb [list ge $compLoc $pos $lenLoc] # Emit the jump to the finish block We need to make an intermediate block # because otherwise the flowgraph edge would be critical set intb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my varargsEmitAndTrack $b bb [list jumpTrue [list bb $intb] $compLoc] # Create the next block and jump to it set newb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my varargsEmitAndTrack $b bb [list jump [list bb $newb]] lset bbcontent $b $bb # Make the intermediate block set b $intb set bb {} my varargsEmitAndTrack $b bb [list jump [list bb $finishB]] lset bbcontent $b $bb # Advance to the new block set b $newb set bb {} # Emit the 'listIndex' to unpack the arg my varargsEmitAndTrack $b bb [list listIndex $argLoc1 $listLoc $pos] # Emit the 'extractMaybe' on the 'listIndex' result my varargsEmitAndTrack $b bb [list extractMaybe $argLoc2 $argLoc1] # Return the place where we stored the arg return [list $intb $argLoc2] } # quadcode::transformer method varargsFinishOptional -- # # Finish transmitting the args that have default values when # compiling {*} # # Parameters: # bVar - Variable in caller holding the current basic block number # bbVar - Variable in caller's scope holding basic block content ................................................................................ # # Side effects: # Closes out the current basic block, opens the finish block, # and emits phi instructions into the finish block. Adds the # outputs of the phi instructions to the 'invoke' instruction # under construction. oo::define quadcode::transformer method varargsFinishOptional {bVar bbVar newqVar finishB optInfo} { upvar 1 $bVar b $bbVar bb $newqVar newq # Finish the current block and start building into 'finishB' my varargsEmitAndTrack $b bb [list jump [list bb $finishB]] lset bbcontent $b $bb set bb {} set fromb $b set b $finishB # Emit the phi instructions ................................................................................ if {$k >= $n} { lappend q $tempLoc } else { lappend q $defaultLit } } lappend q [list bb $fromb] $tempLoc my varargsEmitAndTrack $b bb $q lappend newq $newTemp } } # quadcode::transformer method varargsDoArgs -- # # Emits code to extract the parameter sequence needed to fill '$args' # from the parameter list. # # Parameters: # tempIdxVar - Variable containing the last temporary index used # b - basic block number under construction ................................................................................ # Results: # None. # # Side effects: # Emits any code necessary to fill in 'args', and adds the resulting # variable onto the end of the new instruction. oo::define quadcode::transformer method varargsDoArgs {tempIdxVar b bbVar newqVar listLoc i} { upvar 1 $tempIdxVar tempIndex $bbVar bb $newqVar newq if {$i == 0} { lappend newq $listLoc } else { set argsTemp [list temp [incr tempIndex]] set argsLoc1 [my newVarInstance $argsTemp] my varargsEmitAndTrack $b bb [list listRange $argsLoc1 $listLoc \ [list literal $i] [list literal end]] set argsLoc2 [my newVarInstance $argsTemp] my varargsEmitAndTrack $b bb [list extractMaybe $argsLoc2 $argsLoc1] lappend newq $argsLoc2 } } # quadcode::transformer method varargsCheckTooMany -- # # Emits a codeburst to check whether an 'invokeExpanded' has # too many args # # Parameters: # bVar - Variable holding the basic block number # bbVar - Variable holding the content of the current basic block ................................................................................ # # Results: # None # # Side effects: # Emits code and closes the basic block oo::define quadcode::transformer method varargsCheckTooMany {bVar bbVar lenLoc compTemp i errorB} { upvar 1 $bVar b $bbVar bb set compLoc [my newVarInstance $compTemp] my varargsEmitAndTrack $b bb [list gt $compLoc $lenLoc [list literal $i]] set intb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my varargsEmitAndTrack $b bb [list jumpTrue [list bb $intb] $compLoc] set newb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my varargsEmitAndTrack $b bb [list jump [list bb $newb]] lset bbcontent $b $bb set b $intb set bb {} my varargsEmitAndTrack $b bb [list jump [list bb $errorB]] lset bbcontent $b $bb set b $newb set bb {} } # quadcode::transformer method varargsEmitWrongArgs -- # # Generates code to throw the 'wrong # args' error when needed # # Parameters: # result - Quadcode value that will hold the command result # cfout - Quadcode value that will hold the result callframe, # or {} if no callframe need be produced ................................................................................ # # Results: # None. # # Side effects: # Returns a codeburst that throws the exception oo::define quadcode::transformer method varargsEmitWrongArgs {result cfout cfin cmd} { set burst {} if {$cfin ne "Nothing"} { lappend burst [list copy $cfout $cfin] } ................................................................................ lappend burst $q set q [list extractFail $result $intres] lappend burst $q return $burst } # quadcode::transformer method varargsEmitAndTrack -- # # Emits a quadcode instruction and tracks its effects # # Parameters: # b - Basic block number # bbVar - Variable containing the basic block content # q - Quadcode instruction to emit ................................................................................ # Results: # None. # # Side effects: # Instruction is added to the basic block, and linked in ud- and du-chains # Basic block is linked in control flow if needed. oo::define quadcode::transformer method varargsEmitAndTrack {b bbVar q} { upvar 1 $bbVar bb set res [lindex $q 1] switch -exact -- [lindex $res 0] { "bb" { my bblink $b [lindex $res 1] |
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set pc -1 foreach q $bb { incr pc # At this point in optimization, all invokes are part of a # sequence that is followed within a few instructions by a # jumpMaybe, so there can never be more than one in a basic # block. switch -exact [lindex $q 0] { "invoke" - "invokeExpanded" { my debug-varargs { puts "varargs: examine $b:$pc: $q" } my va_RewriteInvoke $b $pc $q break } } } } my debug-varargs { puts "After variadic call replacement:" my dump-bb } } # quadcode::transformer method va_RewriteInvoke -- # # Rewrites 'invoke' and 'invokeExpanded' instructions to accommodate # compiled procs that accept variable numbers of arguments without going # through a call thunk or losing data type information. # # Parameters: # b - Basic block number ................................................................................ # # Results: # None. # # Side effects: # Rewrites the instruction and 'expand' instructions that it # uses. Updates ud- and du-chains. oo::define quadcode::transformer method va_RewriteInvoke {b pc q} { # Analyze the invocation sequence. This codeburst will run from the # 'moveToCallFrame' preceding the invocation out to the end of the # basic block. We will be rewriting it. set call [::quadcode::invocationSequence new] $call analyze [self] $b $pc # We can process only those sequences where the procedure name is known # a priori, the expected arguments are known, and the target procedure # is compiled. BUG - We know the arguments to a great many Core commands # and need to work with them as well. lassign [$call arginfo] status arginfo if {!$status} return my debug-varargs { puts "[my full-name]: $b:$pc: $q" puts " arginfo = $arginfo" } # We are going to be doing major surgery on the basic block. # Remove the 'invokeExpanded' and all following instructions # from the block. Unlink the block from its successors, and # remove ud- and du-chaining for the removed instructions. set bb [my va_UnlinkTail $b [$call pc0]] set B [quadcode::builder new [self] $b $bb] # Prepare parameters for the 'invoke' (or 'invokeExpanded') call, and # add the call to the instruction sequence under construction. my va_PrepareArgs $B $call puts "NOT FINISHED." exit $B destroy $call destroy return } # quadcode::transformer method va_PrepareArgs -- # # Emits code to prepare the arguments for an 'invoke' or # 'invokeExpanded' command, up to the point where the actual # 'invoke' is issued. # # Parameters: # B - quadcode::builder where the new invocation sequence is being built. # call - Object describing the invocation sequence. # # Results: # None. oo::define quadcode::transformer method va_PrepareArgs {B call} { # Create the first part of the 'invoke' instruction. lassign [$call cmd] status callee if {!$status} { error "can't find callee -- can't happen" } set newq [list invoke \ [$call res_invoke] [$call cfin_invoke] \ [list literal $callee]] # Find out how many plain parameters (that is, not 'args') the # called command has. lassign [$call arginfo] status arginfo if {!$status} { error "can't find arginfo - can't happen" } set nPlainParams [llength $arginfo] set haveargs 0 if {[lindex $arginfo end] eq "args"} { set haveargs 1 incr nPlainParams -1 } # Any leading plain arguments that do not have {*} can simply be retained # in the parameter list of [invoke]. # $pos will be the position in the parameter list of the first # parameter that needs special handling. set argl [$call argl] set pos 0 while {$pos < $nPlainParams} { if {[my va_NonExpandedArgument newq $arginfo $pos $argl]} break incr pos } my debug-varargs { puts "varargs: [$call b]:[$call pc0]: matched $pos out of $nPlainParams\ leading non-expanded arg(s)." } # Generate code to make the rest of the args into a list my va_MakeArgList $B $argl $pos puts "NOT DONE - varargs matched non-expanded args." exit 1 } if 0 { set tempIndex -1 set listLoc [my va_MakeArgList bb tempIndex pos $b $q] # We are going to need the length of the list, so # extract that now. (If it turns out somehow that we # don't use it, 'deadvars' will get rid of this, anyway.) set lenLoc1 [my newVarInstance [list temp [incr tempIndex]]] set lenLoc [my newVarInstance [list temp $tempIndex]] my va_EmitAndTrack $b bb [list listLength $lenLoc1 $listLoc] my va_EmitAndTrack $b bb [list extractMaybe $lenLoc $lenLoc1] # Count the mandatory args set firstMandatory $pos while {$pos < $nPlainParams} { if {[info default $callee [lindex $arginfo $pos] defaultVal]} { break ................................................................................ set nMandatory 0 if {$firstOptional > $firstMandatory} { # Make code to check length of arg list, starting a # new basic block set nMandatory [expr {$firstOptional - $firstMandatory}] set b [my va_CheckEnough $b $bb $lenLoc $compTemp \ $nMandatory $notokb] set bb {} # Make code to transfer mandatory args my va_UnpackMandatory tempIndex bb newq $b $listLoc $nMandatory } # Now we have the parameters that have default values. set j $nMandatory if {$nPlainParams > $firstOptional} { ................................................................................ set optInfo {} set finishB [llength $bbcontent] lappend bbcontent {} lappend bbpred {} set i $firstOptional while {$i < $nPlainParams} { info default $callee [lindex $arginfo $i] defaultVal lassign [my va_UnpackOptional tempIndex b bb \ $finishB $compTemp $listLoc $lenLoc $j] \ fromBlock argLoc lappend optInfo [list $fromBlock $defaultVal $argLoc] incr i incr j } # Close out the last basic block, switch to the 'finish' block # and emit 'phi' instructions to get the correct parameter set my va_FinishOptional b bb newq $finishB $optInfo } # If the procedure has 'args', then fill it in with the remainder of the # arg list. if {$haveargs} { my va_DoArgs tempIndex $b bb newq $listLoc $j } else { my va_CheckTooMany b bb $lenLoc $compTemp $j $notokb } # Create the normal invocation sequence. # 1. Create moveToCallFrame set cfin [$call cfin] set invars [$call invars] if {[$call pc0] < $pc} { set cf2 [my newVarInstance $cfin] set q2 [list moveToCallFrame $cf2 $cfin] dict for {vname val} $invars { lappend q2 [list literal $vname] $val } my va_EmitAndTrack $b bb $q2 set cfin $cf2 lset newq 2 $cfin } # 2. Emit the call as rewritten my va_EmitAndTrack $b bb $newq # 3. Make the 'retrieveResult' set okresult [my newVarInstance [$call retval]] my va_EmitAndTrack $b bb [list retrieveResult $okresult $invokeres] dict set normphis [$call retval] [list bb $norm0b] $okresult dict set errorphis [$call retval] [list bb $err0b] $okresult # 4. Make the 'extractCallFrame' set okcf [my newVarInstance [$call cfout]] my va_EmitAndTrack $b bb [list extractCallFrame $okcf $invokeres] dict set normphis [$call cfout] [list bb $norm0b] $okcf dict set errorphis [$call cfout] [list bb $err0b] $okcf # 5. Make 'moveFromCallFrame' for all output values dict for {vname outval} [$call outvars] { set okval [my newVarInstance $outval] my va_EmitAndTrack $b bb \ [list moveFromCallFrame $okval $okcf [list literal $vname]] dict set normphis $outval [list bb $norm0b] $okval dict set errorphis $outval [list bb $err0b] $okval set notokval [dict get [$call invars] $vname] dict set normphis $outval [list bb $norm1b] $notokval dict set errorphis $outval [list bb $err1b] $notokval } # 6. Make the terminal jumps my va_EmitAndTrack $b bb [list jumpMaybe [list bb $err0b] $okresult] my va_EmitAndTrack $b bb [list jump [list bb $norm0b]] # Emit the final basic block rewrite lset bbcontent $b $bb # toRepair will have the variables that have to be fixed up by # repairSSAVariable after this stuff runs ................................................................................ foreach {v sources} $normphis { set val 0 if {[dict exists $toRepair $v $normb]} { set val [dict get $toRepair $v $normb] } incr val dict set toRepair $v $normb $val my va_EmitAndTrack $normb normbb [list phi $v {*}$sources] } my va_EmitAndTrack $normb normbb [list jump [list bb [$call normexit]]] lset bbcontent $normb $normbb # Make the block for the error exit set errorbb {} foreach {v sources} $errorphis { set val 0 if {[dict exists $toRepair $v $errorb]} { set val [dict get $toRepair $v $errorb] } incr val dict set toRepair $v $errorb $val my va_EmitAndTrack $errorb errorbb [list phi $v {*}$sources] } my va_EmitAndTrack $errorb errorbb [list jump [list bb [$call errexit]]] lset bbcontent $errorb $errorbb # Restore dominance relationships my bbidom; my bblevel my debug-varargs { puts "Before repairing SSA relationships:" ................................................................................ } my debug-varargs { puts "After repairing SSA relationships:" my dump-bb } $call destroy return } # quadcode::transformer method va_UnlinkTail -- # # Removes the invocation sequence from a basic block in preparation # for rewriting it. # # Parameters: # b - Number of the basic block # pc - Program counter of the first instruction being deleted # # Results: # Returns the partial basic block that remains. # # Side effects: # Variable defs and uses in the invocation sequence are removed # from ud- and du-chains. The basic block is unlinked from its # successors. oo::define quadcode::transformer method va_UnlinkTail {b pc} { set bb [lindex $bbcontent $b] set tail [lrange $bb $pc end] set bb [lreplace $bb[set bb {}] $pc end] foreach q $tail { if {[lindex $q 1 0] in {"temp" "var"}} { dict unset udchain [lindex $q 1] } foreach arg [lrange $q 2 end] { if {[lindex $arg 0] in {"temp" "var"}} { my removeUse $arg $b } } } foreach b2 [my bbsucc $b] { my removePred $b2 $b } return $bb } # quadcode::transformer method va_NonExpandedArgument -- # # Transfer a leading non-expanded argument into a quad # under construction when rewriting 'invokeExpanded' # # Parameters: # newqVar - Name of a variable in caller's scope storing the # plain 'invoke' operation under construction # arginfo - Result of [info args] against the invoked proc # pos - Position of the argument (0 = first) in the argument list # argl - Argument list of the 'invoke' or 'invokeExpanded' instruction # # Results: # Returns 0 if the parameter was transferred, 1 if we are at the # end of the possible static transfers. oo::define quadcode::transformer method va_NonExpandedArgument {newqVar arginfo pos argl} { upvar 1 $newqVar newq set param [lindex $arginfo $pos] set arg [lindex $argl $pos] switch -exact -- [lindex $arg 0] { "literal" { } "temp" - "var" { lassign [my findDef $arg] defb defpc defstmt if {[lindex $defstmt 0] eq "expand"} { return 1 } } default { return 1 } } lappend newq $arg return 0 } # quadcode::transformer method va_MakeArgList -- # # Takes the non-fixed-position arguments of 'invokeExpanded' # and emits code to make them into a list. # # Parameters: # B - quadcode::builder that is rewriting the invocation sequence. # argl - Argument list being analyzed # pos - Position in the argument list # # Results: # # Returns the name of a variable, temporary or literal that holds the # expanded list. oo::define quadcode::transformer method va_MakeArgList {B argl pos} { # Handle the first arg. 'listloc' will be the variable holding the # expanded arglist. 'mightThrow' will be 1 if 'listloc' # might be a non-list and 0 otherwise. if {$pos >= [llength $argl]} { set listLoc "literal {}" } else { set arg [lindex $argl $pos] switch -exact -- [lindex $arg 0] { "literal" { set listloc [$B maketemp arglist] $B emit [list list $listloc $arg] set mightThrow 0 } "temp" - "var" { lassign [my findDef $arg] defb defpc defstmt if {[lindex $defstmt 0] eq "expand"} { set listLoc [lindex $defstmt 2] set mightThrow 1 } else { set listLoc [$B maketemp arglist] $B emit [list list $listLoc $arg] set mightThrow 0 } } } } puts "did first arg, arglist is $listLoc, and b so far is\n[join [$B bb] \n]" puts "lhsMightThrow = $lhsMightThrow" if {$lhsMightThrow} { exit 1 # listLoc now holds the location of the list under # construction. Concatenate the remaining params onto it. foreach arg [lrange $argl [expr {1 + $pos}] end] { # Do we need to expand this arg? switch -exact -- [lindex $arg 0] { "literal" { set op "listAppend" } "temp" - "var" { lassign [my findDef $arg] defb defpc defstmt if {[lindex $defstmt 0] eq "expand"} { set op "listConcat" } else { set op "listAppend" } } } # Make variable to hold Maybe result from the concatenation, # and emit the concatenation. set nloc [$B maketemp arglist] $B emit [list $op $nloc $listLoc $arg] if {$lhsMightThrow || $op == "listConcat"} { my makeErrorBlock $B set intb [$B makeblock] set nextb [$B makeblock] $B emit [list jumpMaybe [list bb $intb] $nloc] set lhsMightThrow 0 $B emit [list jump [list bb $nextb]] $B buildin $intb set error [$B maketemp nloc] $B emit [list extractFail $error $nloc] $B emit [list jump [list bb $errorb]] $B phi $errorb error $error $B emit [list jump [list bb $errorb]] $B buildin $nextb # KBK is here - need to get my context back!!! } # extract the result from the Maybe set listLoc [$B maketemp arglist] $B emit [list extractMaybe $listLoc $nloc] } return $listLoc } # quadcode::transformer method va_CheckEnough -- # # Emits code to check for too few args passed to invokeExpanded # # Parameters: # b - Basic block number under construction # bb - Instructions in the block # lenLoc - Location holding the length of the arg list ................................................................................ # compTemp - Temporary variable name to use for comparison # nMandatory - Number of mandatory args still unpaired # errorB - Basic block to jump to if too few args # # Results: # Returns the new basic block number; this method ends the block. oo::define quadcode::transformer method va_CheckEnough {b bb lenLoc compTemp nMandatory errorB} { # Emit {$nMandatory > $lenLoc} set compLoc [my newVarInstance $compTemp] my va_EmitAndTrack $b bb \ [list gt $compLoc [list literal $nMandatory] $lenLoc] # Emit jumpTrue to the error block. This has to go through an # intermediate block because it will be a critical edge otherwise. # Emit jump to the following block set intb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} set newb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my va_EmitAndTrack $b bb [list jumpTrue [list bb $intb] $compLoc] my va_EmitAndTrack $b bb [list jump [list bb $newb]] lset bbcontent $b $bb set bb {} # Emit the intermediate jump my va_EmitAndTrack $intb bb [list jump [list bb $errorB]] lset bbcontent $intb $bb set bb {} return $newb } # quadcode::transformer method va_UnpackMandatory -- # # Unpacks the mandatory args to a proc from the list created # by argument expansion # # Parameters; # tempIdxVar - Variable in caller's scope containing the last # allocated temporary ................................................................................ # # Results: # None. # # Side effects: # Emits code to unpack the mandatory parameters oo::define quadcode::transformer method va_UnpackMandatory {tempIdxVar bbVar newqVar b listLoc nMandatory} { upvar 1 $tempIdxVar tempIdx $bbVar bb $newqVar newq for {set i 0} {$i < $nMandatory} {incr i} { # Emit the 'listIndex' instruction for one arg. It can't fail # because we know we have a list set argTemp [list temp [incr tempIdx]] set argLoc [my newVarInstance $argTemp] my va_EmitAndTrack $b bb \ [list listIndex $argLoc $listLoc [list literal $i]] # Emit the 'extractMaybe' to get the arg from the Maybe # result of 'listIndex' set argLoc2 [my newVarInstance $argTemp] my va_EmitAndTrack $b bb [list extractMaybe $argLoc2 $argLoc] # Put the extracted arg on the 'invoke' instruction lappend newq $argLoc2 } } # quadcode::transformer method va_UnpackOptional -- # # Emits code to unpack one optional parameter in an invokeExpanded # # Parameters: # tempIdxVar - Variable holding the index of the last used temporary # bVar - Variable holding the current basic block number # bbVar - Variable holding the content of the basic block under ................................................................................ # to the finish if the parameter is not supplied and the # location of a temporary holding the unpacked value if it is. # # Side effects: # Emits code to unpack one value, or jump to the finish block if # there is nothing to unpack. oo::define quadcode::transformer method va_UnpackOptional {tempIdxVar bVar bbVar finishB compTemp listLoc lenLoc j} { upvar 1 $tempIdxVar tempIndex $bVar b $bbVar bb set pos [list literal $j] set compLoc [my newVarInstance $compTemp] set argTemp [list temp [incr tempIndex]] set argLoc1 [my newVarInstance $argTemp] set argLoc2 [my newVarInstance $argTemp] # Emit the list length comparison my va_EmitAndTrack $b bb [list ge $compLoc $pos $lenLoc] # Emit the jump to the finish block We need to make an intermediate block # because otherwise the flowgraph edge would be critical set intb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my va_EmitAndTrack $b bb [list jumpTrue [list bb $intb] $compLoc] # Create the next block and jump to it set newb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my va_EmitAndTrack $b bb [list jump [list bb $newb]] lset bbcontent $b $bb # Make the intermediate block set b $intb set bb {} my va_EmitAndTrack $b bb [list jump [list bb $finishB]] lset bbcontent $b $bb # Advance to the new block set b $newb set bb {} # Emit the 'listIndex' to unpack the arg my va_EmitAndTrack $b bb [list listIndex $argLoc1 $listLoc $pos] # Emit the 'extractMaybe' on the 'listIndex' result my va_EmitAndTrack $b bb [list extractMaybe $argLoc2 $argLoc1] # Return the place where we stored the arg return [list $intb $argLoc2] } # quadcode::transformer method va_FinishOptional -- # # Finish transmitting the args that have default values when # compiling {*} # # Parameters: # bVar - Variable in caller holding the current basic block number # bbVar - Variable in caller's scope holding basic block content ................................................................................ # # Side effects: # Closes out the current basic block, opens the finish block, # and emits phi instructions into the finish block. Adds the # outputs of the phi instructions to the 'invoke' instruction # under construction. oo::define quadcode::transformer method va_FinishOptional {bVar bbVar newqVar finishB optInfo} { upvar 1 $bVar b $bbVar bb $newqVar newq # Finish the current block and start building into 'finishB' my va_EmitAndTrack $b bb [list jump [list bb $finishB]] lset bbcontent $b $bb set bb {} set fromb $b set b $finishB # Emit the phi instructions ................................................................................ if {$k >= $n} { lappend q $tempLoc } else { lappend q $defaultLit } } lappend q [list bb $fromb] $tempLoc my va_EmitAndTrack $b bb $q lappend newq $newTemp } } # quadcode::transformer method va_DoArgs -- # # Emits code to extract the parameter sequence needed to fill '$args' # from the parameter list. # # Parameters: # tempIdxVar - Variable containing the last temporary index used # b - basic block number under construction ................................................................................ # Results: # None. # # Side effects: # Emits any code necessary to fill in 'args', and adds the resulting # variable onto the end of the new instruction. oo::define quadcode::transformer method va_DoArgs {tempIdxVar b bbVar newqVar listLoc i} { upvar 1 $tempIdxVar tempIndex $bbVar bb $newqVar newq if {$i == 0} { lappend newq $listLoc } else { set argsTemp [list temp [incr tempIndex]] set argsLoc1 [my newVarInstance $argsTemp] my va_EmitAndTrack $b bb [list listRange $argsLoc1 $listLoc \ [list literal $i] [list literal end]] set argsLoc2 [my newVarInstance $argsTemp] my va_EmitAndTrack $b bb [list extractMaybe $argsLoc2 $argsLoc1] lappend newq $argsLoc2 } } # quadcode::transformer method va_CheckTooMany -- # # Emits a codeburst to check whether an 'invokeExpanded' has # too many args # # Parameters: # bVar - Variable holding the basic block number # bbVar - Variable holding the content of the current basic block ................................................................................ # # Results: # None # # Side effects: # Emits code and closes the basic block oo::define quadcode::transformer method va_CheckTooMany {bVar bbVar lenLoc compTemp i errorB} { upvar 1 $bVar b $bbVar bb set compLoc [my newVarInstance $compTemp] my va_EmitAndTrack $b bb [list gt $compLoc $lenLoc [list literal $i]] set intb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my va_EmitAndTrack $b bb [list jumpTrue [list bb $intb] $compLoc] set newb [llength $bbcontent] lappend bbcontent {} lappend bbpred {} my va_EmitAndTrack $b bb [list jump [list bb $newb]] lset bbcontent $b $bb set b $intb set bb {} my va_EmitAndTrack $b bb [list jump [list bb $errorB]] lset bbcontent $b $bb set b $newb set bb {} } # quadcode::transformer method va_EmitWrongArgs -- # # Generates code to throw the 'wrong # args' error when needed # # Parameters: # result - Quadcode value that will hold the command result # cfout - Quadcode value that will hold the result callframe, # or {} if no callframe need be produced ................................................................................ # # Results: # None. # # Side effects: # Returns a codeburst that throws the exception oo::define quadcode::transformer method va_EmitWrongArgs {result cfout cfin cmd} { set burst {} if {$cfin ne "Nothing"} { lappend burst [list copy $cfout $cfin] } ................................................................................ lappend burst $q set q [list extractFail $result $intres] lappend burst $q return $burst } # quadcode::transformer method va_EmitAndTrack -- # # Emits a quadcode instruction and tracks its effects # # Parameters: # b - Basic block number # bbVar - Variable containing the basic block content # q - Quadcode instruction to emit ................................................................................ # Results: # None. # # Side effects: # Instruction is added to the basic block, and linked in ud- and du-chains # Basic block is linked in control flow if needed. oo::define quadcode::transformer method va_EmitAndTrack {b bbVar q} { upvar 1 $bbVar bb set res [lindex $q 1] switch -exact -- [lindex $res 0] { "bb" { my bblink $b [lindex $res 1] |