533 lines
35 KiB
Plaintext
533 lines
35 KiB
Plaintext
fst_ptr <- 0
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slot1 <- 4
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header <- 8
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off_oref <- -8
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off_osize <- -4
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off_next <- 0
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off_size <- 4
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// memlib - simple memory allocator for ILOC
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//
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// This library maintains a single-linked list (of monotonically increasing addresses) of free
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// slots in memory and a reference count for occupied slots. Each slot contains a tuple `(next
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// free slot address,size)` followed by `size` free bytes. The memory is initiliased with a
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// pointer to the first free slot at `#fst_ptr` and one free slot at `#slot1` of size
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// `brk-slot1-header`. When a piece of memory is requested for allocation, a tuple
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// `(reference count, size)` followed by `size` bytes for the object is formed. The calling
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// convention of the functions in this library consists of pushing the return address followed by
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// any arguments (in order) to the stack. Any return values will be pushed to the stack likewise.
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//
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// Requires a register `brk` for the highest address available for heap allocation.
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// Requires an instruction `halt` when memory runs out
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//
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// @author Frank Wibbelink
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// initialise
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memlib_: loadI 0 => m_0
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loadI @slot1 => m_1
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subI brk,@slot1 => m_2
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subI m_2,@header => m_2
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storeAI m_1 => m_0,@fst_ptr // pointer to first slot
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storeAI m_0 => m_1,@off_next // next slot is null
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storeAI m_2 => m_1,@off_size // first slot size
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jumpI -> ememlib_
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// allocate memory
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// searches through the free slots for either a slot size of ~~exactly #4+8 or a size of~~ at
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// least #4+16
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// stack: [return address, object size] -> [object address]
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memalloc: loadI 0 => m_0
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pop => m_s // load size
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loadI @fst_ptr => m_p // load previous address (base pointer)
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loadAI m_p,@off_next => m_c // load current address (first slot)
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ma_loop: cmp_EQ m_0,m_c => m_1 // check if address pointer is null
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cbr m_1 -> ma_null,ma_cont // if null, go to end and return null pointer
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ma_cont: loadAI m_c,@off_size => m_1 // load slot size
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cmp_EQ m_1,m_s => m_2 // check if request fits exactly
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cbr m_2 -> ma_yxct,ma_nxct
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ma_nxct: subI m_1,@header => m_1 // subtract free slot size
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cmp_GE m_1,m_s => m_1 // check if request fits
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cbr m_1 -> ma_found,ma_next
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ma_next: i2i m_c => m_p
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loadAI m_p,@off_next => m_c
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jumpI -> ma_loop
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ma_yxct: loadAI m_c,@off_next => m_n // location of next free slot
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jumpI -> ma_final
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ma_found: addI m_s,@header => m_1
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add m_1,m_c => m_n // location of new free slot
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loadAI m_c,@off_size => m_1
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subI m_1,@header => m_1
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sub m_1,m_s => m_1 // size of new free slot
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storeAI m_1 => m_n,@off_size
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loadAI m_c,@off_next => m_1 // location of next free slot
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storeAI m_1 => m_n,@off_next
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ma_final: storeAI m_n => m_p,@off_next // link previous free slot to new
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addI m_c,@header => m_c // move to object location
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loadI 1 => m_1
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storeAI m_1 => m_c,@off_oref // set reference count to 1
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storeAI m_s => m_c,@off_osize // set object size
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ma_zerc: cbr m_s -> ma_zerl,ma_null // zero memory
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ma_zerl: subI m_s,1 => m_s
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cstoreAO m_0 => m_c,m_s
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jumpI -> ma_zerc
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ma_null: pop => m_1 // load return address
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push m_c // store object address
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jump -> m_1
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// increase reference count of object
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// stack: [return address, object address] -> []
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memaddref: loadI 0 => m_0
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pop => m_n // load object address
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cmp_EQ m_0,m_n => m_1
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cbr m_1 -> mr_ynul,mr_nnul // check if null pointer
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mr_ynul: haltI 1865445997
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mr_nnul: loadAI m_n,@off_oref => m_1
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addI m_1,1 => m_1
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storeAI m_1 => m_n,@off_oref
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pop => m_1 // load return address
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jump -> m_1
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// decrease reference count of object
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// frees memory if count goes to zero
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// stack: [return address, object address] -> []
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memfree: loadI 0 => m_0
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pop => m_n // load object address
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cmp_EQ m_0,m_n => m_1
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cbr m_1 -> mf_ynul,mf_nnul // check if null pointer
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mf_ynul: haltI 1865442925
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mf_nnul: loadAI m_n,@off_oref => m_1
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subI m_1,1 => m_1
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cmp_GT m_1,m_0 => m_2
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cbr m_2 -> mf_exit,mf_free
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mf_exit: storeAI m_1 => m_n,@off_oref
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pop => m_1 // load return address
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jump -> m_1
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mf_free: subI m_n,@header => m_n
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loadI @fst_ptr => m_p
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loadAI m_p,@off_next => m_c
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mf_loop: cmp_EQ m_0,m_c => m_1 // loop until the surrounding free blocks are found
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cbr m_1 -> mf_halt,mf_cont // check if address pointer is null
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mf_halt: haltI 1882220141 // halt program; object beyond last free slot (or memory corrupted)
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mf_cont: cmp_EQ m_c,m_n => m_1
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cbr m_1 -> mf_hal2,mf_con2
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mf_hal2: haltI 1717855853 // halt program; object is free slot
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mf_con2: cmp_LE m_c,m_n => m_1
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cbr m_1 -> mf_next,mf_done
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mf_next: i2i m_c => m_p
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loadAI m_p,@off_next => m_c
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jumpI -> mf_loop
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mf_done: loadAI m_p,@off_size => m_1
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addI m_1,@header => m_1
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add m_1,m_p => m_2
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cmp_EQ m_2,m_n => m_2
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cbr m_2 -> mf_yprv,mf_nprv
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mf_yprv: loadAI m_n,@off_size => m_2 // merge with previous free slot
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add m_1,m_2 => m_1 // new size of previous free slot
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storeAI m_1 => m_p,@off_size
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i2i m_p => m_n
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jumpI -> mf_dprv
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mf_nprv: storeAI m_n => m_p,@off_next // link previous free slot with new
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mf_dprv: loadAI m_n,@off_size => m_1
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addI m_1,@header => m_1
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add m_1,m_n => m_2
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cmp_EQ m_2,m_c => m_2
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cbr m_2 -> mf_ynxt,mf_nnxt
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mf_ynxt: loadAI m_c,@off_size => m_2 // merge with next free slot
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add m_1,m_2 => m_1 // new size of next free slot
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storeAI m_1 => m_n,@off_size
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loadAI m_c,@off_next => m_1
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storeAI m_1 => m_n,@off_next // move link of next's next to new free slot
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pop => m_1 // load return address
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jump -> m_1
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mf_nnxt: storeAI m_c => m_n,@off_next // link new free slot with next
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pop => m_1 // load return address
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jump -> m_1
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// copy object to location
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// stack: [return address, object address, destination] -> []
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memcopy: loadI 0 => m_0
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haltI 1835626101 // unimplemented
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pop => m_1 // load return address
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jump -> m_1
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ememlib_: nop
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// end of memlib
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// stdlib - generic subroutines for ILOC
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//
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// This library contains a few common subroutines for Boppi.
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//
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// @author Frank Wibbelink
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// initialise
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stdlib_: jumpI -> estdlib_
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// write a boolean to output
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// stack: [return address, bool] -> []
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stdbout: pop => m_1 // get boolean
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loadI 0 => m_2 // load zero-length string
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push m_2
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cbr m_1 -> sbout_t,sbout_f
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sbout_t: cout "true"
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jumpI -> sbout_e
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sbout_f: cout "false"
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sbout_e: pop => m_1 // load return address
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jump -> m_1
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// write an array of characters (a string) to output
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// stack: [return address, address] -> []
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stdsout: pop => m_1 // get address
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loadAI m_1,@off_osize => m_2 // get length
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sout_lc: cbr m_2 -> sout_ll,sout_le // check if any character to push
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sout_ll: subI m_2,1 => m_2 // iterate backward
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cloadAO m_1,m_2 => m_c // get character
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cpush m_c // push character
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jumpI -> sout_lc // repeat
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sout_le: loadAI m_1,@off_osize => m_2 // get length
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push m_2 // push string length
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cout "" // print string
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pop => m_1 // get return address
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jump -> m_1
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// read a character from input
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// stack: [return address] -> [char]
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stdcin: cin "" // get line
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pop => m_1 // get length
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cbr m_1 -> scin_t,stdcin // repeat until at least one character
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scin_t: cpop => m_2 // save character
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scin_lc: subI m_1,1 => m_1 // decrement char count
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cbr m_1 -> scin_ll,scin_le
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scin_ll: cpop => m_0 // discard character
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jumpI -> scin_lc // repeat
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scin_le: loadI 0 => m_0 // reset zero register
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pop => m_1 // get return address
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cpush m_2 // push result character
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jump -> m_1
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// read an array of characters (a string) from input
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// the memalloc label cannot be used, so address 28 is used instead
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// stack: [return address] -> [address]
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stdsin: cin "" // get line
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pop => m_2 // get length
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push m_2 // save length
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loadI #ssin_a => m_1 // call malloc
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push m_1 // call malloc
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push m_2 // call malloc
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loadI 28 => m_c // call malloc
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jump -> m_c // call malloc
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ssin_a: pop => m_1 // get array address
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pop => m_2 // get length
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i2i m_1 => m_n // load character iterator
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ssin_c: cbr m_2 -> ssin_l,ssin_e // pop characters into the array
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ssin_l: subI m_2,1 => m_2
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cpop => m_c // pop character
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cstore m_c => m_n // save character
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addI m_n,1 => m_n // increment iterator
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jumpI -> ssin_c
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ssin_e: pop => m_2 // get return address
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push m_1 // push array address
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jump -> m_2
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estdlib_: nop
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// end of stdlib
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loadI 0 => r_nul // initialise zero register
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loadI 217 => r_arp // malloc
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push r_arp // malloc
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loadI 28 => r_arp // malloc
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push r_arp // malloc
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jumpI -> memalloc // malloc
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pop => r_arp // malloc
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addI r_arp,16 => r_arp // construct main AR
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jumpI -> s0 // define f1 - jump over body
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nop // define f1 - entry point
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addI r_arp,0 => r_1 // add offset
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load r_1 => r_1 // load address
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storeAI r_1 => r_arp,-12 // define f1 - move result
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loadAI r_arp,-8 => r_2 // load ref count
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loadI 1 => r_1 // one
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cmp_LE r_2,r_1 => r_2 // check more than one ref
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cbr r_2 -> ycl1,ncl2 // remove vars if last reference
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ycl1: nop // cleanup target
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ncl2: nop // no cleanup target
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loadAI r_arp,-8 => r_1 // define f1 - load return address
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jump -> r_1 // define f1 - go to return address
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s0: nop // define f1 - skip target
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loadI 238 => r_1 // malloc
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push r_1 // malloc
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loadI 12 => r_1 // malloc
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push r_1 // malloc
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jumpI -> memalloc // malloc
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pop => r_1 // malloc
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loadI 220 => r_2 // define f1 - load target address
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storeAI r_2 => r_1,0 // define f1 - set target address
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storeAI r_arp => r_1,4 // define f1 - copy ARP
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loadI 20 => r_2 // define f1 - load AR size
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storeAI r_2 => r_1,8 // define f1 - set AR size
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storeAI r_1 => r_arp,4 // define f1 - set function reference
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i2i r_arp => ART // AR incRef
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cmp_NE ART,r_nul => r_1 // AR incRef
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cbr r_1 -> aril3,arid4 // AR incRef
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aril3: loadI 253 => r_1 // AR incRef
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push r_1 // AR incRef
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subI ART,16 => r_1 // AR incRef
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push r_1 // AR incRef
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jumpI -> memaddref // AR incRef
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loadAI ART,-16 => ART // AR incRef
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cmp_NE ART,r_nul => r_1 // AR incRef
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cbr r_1 -> aril3,arid4 // AR incRef
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arid4: nop // AR incRef
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loadI 0 => r_1 // false
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cbr r_1 -> if_t5,if_e7 //
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if_t5: nop //
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addI r_arp,4 => r_1 // add offset
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load r_1 => r_1 // load address
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loadI 266 => r_3 // memaddref
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push r_3 // memaddref
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push r_1 // memaddref
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jumpI -> memaddref // memaddref
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loadAI r_1,4 => r_2 // add new reference
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i2i r_2 => ART // AR incRef
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cmp_NE ART,r_nul => r_3 // AR incRef
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cbr r_3 -> aril8,arid9 // AR incRef
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aril8: loadI 275 => r_3 // AR incRef
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push r_3 // AR incRef
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subI ART,16 => r_3 // AR incRef
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push r_3 // AR incRef
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jumpI -> memaddref // AR incRef
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loadAI ART,-16 => ART // AR incRef
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cmp_NE ART,r_nul => r_3 // AR incRef
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cbr r_3 -> aril8,arid9 // AR incRef
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arid9: nop // AR incRef
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addI r_arp,0 => r_2 // add offset
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load r_2 => r_3 // load reference
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cmp_EQ r_3,r_nul => r_4 // remove old reference
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cbr r_4 -> ynul10,nnul11 // remove old reference
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nnul11: nop // remove old reference
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loadI 288 => r_4 // free
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push r_4 // free
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push r_3 // free
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jumpI -> memfree // free
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loadAI r_3,4 => r_3 // remove old reference
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i2i r_3 => ART // AR decRef
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cmp_NE ART,r_nul => r_4 // AR decRef
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cbr r_4 -> ardl12,ardd13 // AR decRef
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ardl12: loadI 297 => r_4 // AR decRef
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push r_4 // AR decRef
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subI ART,16 => r_4 // AR decRef
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push r_4 // AR decRef
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jumpI -> memfree // AR decRef
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loadAI ART,-16 => ART // AR decRef
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cmp_NE ART,r_nul => r_4 // AR decRef
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cbr r_4 -> ardl12,ardd13 // AR decRef
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ardd13: nop // AR decRef
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ynul10: nop // remove old reference
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store r_1 => r_2 // to f
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load r_2 => r_3 // load reference
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loadI 308 => r_5 // memaddref
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push r_5 // memaddref
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push r_3 // memaddref
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jumpI -> memaddref // memaddref
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loadAI r_3,4 => r_4 // add new reference
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i2i r_4 => ART // AR incRef
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cmp_NE ART,r_nul => r_5 // AR incRef
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cbr r_5 -> aril14,arid15 // AR incRef
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aril14: loadI 317 => r_5 // AR incRef
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push r_5 // AR incRef
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subI ART,16 => r_5 // AR incRef
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push r_5 // AR incRef
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jumpI -> memaddref // AR incRef
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loadAI ART,-16 => ART // AR incRef
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cmp_NE ART,r_nul => r_5 // AR incRef
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cbr r_5 -> aril14,arid15 // AR incRef
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arid15: nop // AR incRef
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cmp_EQ r_1,r_nul => r_3 // remove old reference
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cbr r_3 -> ynul16,nnul17 // remove old reference
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nnul17: nop // remove old reference
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loadI 328 => r_3 // free
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push r_3 // free
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push r_1 // free
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jumpI -> memfree // free
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loadAI r_1,4 => r_1 // remove old reference
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i2i r_1 => ART // AR decRef
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cmp_NE ART,r_nul => r_3 // AR decRef
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cbr r_3 -> ardl18,ardd19 // AR decRef
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ardl18: loadI 337 => r_3 // AR decRef
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push r_3 // AR decRef
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subI ART,16 => r_3 // AR decRef
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push r_3 // AR decRef
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jumpI -> memfree // AR decRef
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loadAI ART,-16 => ART // AR decRef
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cmp_NE ART,r_nul => r_3 // AR decRef
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cbr r_3 -> ardl18,ardd19 // AR decRef
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ardd19: nop // AR decRef
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ynul16: nop // remove old reference
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addI r_arp,0 => r_4 // add offset
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load r_4 => r_4 // load address
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loadI 348 => r_2 // memaddref
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push r_2 // memaddref
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push r_4 // memaddref
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jumpI -> memaddref // memaddref
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loadAI r_4,4 => r_3 // add new reference
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i2i r_3 => ART // AR incRef
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cmp_NE ART,r_nul => r_2 // AR incRef
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cbr r_2 -> aril20,arid21 // AR incRef
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aril20: loadI 357 => r_2 // AR incRef
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push r_2 // AR incRef
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subI ART,16 => r_2 // AR incRef
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push r_2 // AR incRef
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jumpI -> memaddref // AR incRef
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loadAI ART,-16 => ART // AR incRef
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cmp_NE ART,r_nul => r_2 // AR incRef
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cbr r_2 -> aril20,arid21 // AR incRef
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arid21: nop // AR incRef
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addI r_arp,0 => r_2 // add offset
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load r_2 => r_1 // load reference
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cmp_EQ r_1,r_nul => r_3 // remove old reference
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cbr r_3 -> ynul22,nnul23 // remove old reference
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nnul23: nop // remove old reference
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loadI 370 => r_3 // free
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push r_3 // free
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push r_1 // free
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jumpI -> memfree // free
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loadAI r_1,4 => r_1 // remove old reference
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i2i r_1 => ART // AR decRef
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cmp_NE ART,r_nul => r_3 // AR decRef
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cbr r_3 -> ardl24,ardd25 // AR decRef
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ardl24: loadI 379 => r_3 // AR decRef
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push r_3 // AR decRef
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subI ART,16 => r_3 // AR decRef
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push r_3 // AR decRef
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jumpI -> memfree // AR decRef
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loadAI ART,-16 => ART // AR decRef
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cmp_NE ART,r_nul => r_3 // AR decRef
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cbr r_3 -> ardl24,ardd25 // AR decRef
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ardd25: nop // AR decRef
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ynul22: nop // remove old reference
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store r_4 => r_2 // to f
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load r_2 => r_3 // load reference
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loadI 390 => r_5 // memaddref
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push r_5 // memaddref
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push r_3 // memaddref
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jumpI -> memaddref // memaddref
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loadAI r_3,4 => r_1 // add new reference
|
|
i2i r_1 => ART // AR incRef
|
|
cmp_NE ART,r_nul => r_5 // AR incRef
|
|
cbr r_5 -> aril26,arid27 // AR incRef
|
|
aril26: loadI 399 => r_5 // AR incRef
|
|
push r_5 // AR incRef
|
|
subI ART,16 => r_5 // AR incRef
|
|
push r_5 // AR incRef
|
|
jumpI -> memaddref // AR incRef
|
|
loadAI ART,-16 => ART // AR incRef
|
|
cmp_NE ART,r_nul => r_5 // AR incRef
|
|
cbr r_5 -> aril26,arid27 // AR incRef
|
|
arid27: nop // AR incRef
|
|
if_e7: nop // end target
|
|
loadI 409 => r_3 // malloc
|
|
push r_3 // malloc
|
|
loadI 8 => r_3 // malloc
|
|
push r_3 // malloc
|
|
jumpI -> memalloc // malloc
|
|
pop => r_3 // malloc
|
|
loadI 2 => r_2 // 2
|
|
storeAI r_2 => r_3,0 // store array element
|
|
loadI 2 => r_4 // 2
|
|
storeAI r_4 => r_3,4 // store array element
|
|
addI r_arp,8 => r_2 // add offset
|
|
load r_2 => r_1 // load reference
|
|
cmp_EQ r_1,r_nul => r_4 // remove old reference
|
|
cbr r_4 -> ynul28,nnul29 // remove old reference
|
|
nnul29: nop // remove old reference
|
|
loadI 423 => r_4 // free
|
|
push r_4 // free
|
|
push r_1 // free
|
|
jumpI -> memfree // free
|
|
ynul28: nop // remove old reference
|
|
store r_3 => r_2 // to arr
|
|
load r_2 => r_4 // load reference
|
|
loadI 430 => r_5 // memaddref
|
|
push r_5 // memaddref
|
|
push r_4 // memaddref
|
|
jumpI -> memaddref // memaddref
|
|
cmp_EQ r_3,r_nul => r_4 // remove old reference
|
|
cbr r_4 -> ynul30,nnul31 // remove old reference
|
|
nnul31: nop // remove old reference
|
|
loadI 437 => r_4 // free
|
|
push r_4 // free
|
|
push r_3 // free
|
|
jumpI -> memfree // free
|
|
ynul30: nop // remove old reference
|
|
addI r_arp,8 => r_2 // add offset
|
|
load r_2 => r_2 // get array object
|
|
loadI 0 => r_4 // 0
|
|
loadAI r_2,-4 => r_3 // check array index
|
|
divI r_3,4 => r_3 // check array index
|
|
cmp_LT r_4,r_3 => r_3 // check array index
|
|
cmp_GE r_4,r_nul => r_1 // check array index
|
|
and r_3,r_1 => r_1 // check array index
|
|
cbr r_1 -> nob33,oob32 // check array index
|
|
oob32: haltI 1634692962 // array index out of bounds
|
|
nob33: multI r_4,4 => r_4 // multiply index by size
|
|
add r_2,r_4 => r_2 // get array index address
|
|
load r_2 => r_2 // load address
|
|
addI r_arp,8 => r_1 // add offset
|
|
load r_1 => r_1 // get array object
|
|
loadI 1 => r_3 // 1
|
|
loadAI r_1,-4 => r_5 // check array index
|
|
divI r_5,4 => r_5 // check array index
|
|
cmp_LT r_3,r_5 => r_5 // check array index
|
|
cmp_GE r_3,r_nul => r_4 // check array index
|
|
and r_5,r_4 => r_4 // check array index
|
|
cbr r_4 -> nob35,oob34 // check array index
|
|
oob34: haltI 1634692962 // array index out of bounds
|
|
nob35: multI r_3,4 => r_3 // multiply index by size
|
|
add r_1,r_3 => r_1 // get array index address
|
|
load r_1 => r_1 // load address
|
|
add r_2,r_1 => r_2 // +
|
|
out "",r_2 //
|
|
loadAI r_arp,0 => r_1 // remove reference get var
|
|
cmp_EQ r_1,r_nul => r_3 // remove reference
|
|
cbr r_3 -> ynul36,nnul37 // remove reference
|
|
nnul37: nop // remove reference
|
|
loadI 474 => r_3 // free
|
|
push r_3 // free
|
|
push r_1 // free
|
|
jumpI -> memfree // free
|
|
loadAI r_1,4 => r_1 // remove reference
|
|
i2i r_1 => ART // AR decRef
|
|
cmp_NE ART,r_nul => r_3 // AR decRef
|
|
cbr r_3 -> ardl38,ardd39 // AR decRef
|
|
ardl38: loadI 483 => r_3 // AR decRef
|
|
push r_3 // AR decRef
|
|
subI ART,16 => r_3 // AR decRef
|
|
push r_3 // AR decRef
|
|
jumpI -> memfree // AR decRef
|
|
loadAI ART,-16 => ART // AR decRef
|
|
cmp_NE ART,r_nul => r_3 // AR decRef
|
|
cbr r_3 -> ardl38,ardd39 // AR decRef
|
|
ardd39: nop // AR decRef
|
|
ynul36: nop // remove reference
|
|
loadAI r_arp,4 => r_1 // remove reference get var
|
|
cmp_EQ r_1,r_nul => r_3 // remove reference
|
|
cbr r_3 -> ynul40,nnul41 // remove reference
|
|
nnul41: nop // remove reference
|
|
loadI 496 => r_3 // free
|
|
push r_3 // free
|
|
push r_1 // free
|
|
jumpI -> memfree // free
|
|
loadAI r_1,4 => r_1 // remove reference
|
|
i2i r_1 => ART // AR decRef
|
|
cmp_NE ART,r_nul => r_3 // AR decRef
|
|
cbr r_3 -> ardl42,ardd43 // AR decRef
|
|
ardl42: loadI 505 => r_3 // AR decRef
|
|
push r_3 // AR decRef
|
|
subI ART,16 => r_3 // AR decRef
|
|
push r_3 // AR decRef
|
|
jumpI -> memfree // AR decRef
|
|
loadAI ART,-16 => ART // AR decRef
|
|
cmp_NE ART,r_nul => r_3 // AR decRef
|
|
cbr r_3 -> ardl42,ardd43 // AR decRef
|
|
ardd43: nop // AR decRef
|
|
ynul40: nop // remove reference
|
|
loadAI r_arp,8 => r_1 // remove reference get var
|
|
cmp_EQ r_1,r_nul => r_3 // remove reference
|
|
cbr r_3 -> ynul44,nnul45 // remove reference
|
|
nnul45: nop // remove reference
|
|
loadI 518 => r_3 // free
|
|
push r_3 // free
|
|
push r_1 // free
|
|
jumpI -> memfree // free
|
|
ynul44: nop // remove reference
|
|
subI r_arp,16 => r_arp // deconstruct main AR
|
|
loadI 524 => r_2 // free
|
|
push r_2 // free
|
|
push r_arp // free
|
|
jumpI -> memfree // free
|