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< h1 > Source code for Lib.Allocator< / h1 > < div class = "highlight" > < pre >
< span > < / span > < span class = "sd" > " " " < / span >
< span class = "sd" > This file defines the base class :py:class:`Allocator`< / span >
< span class = "sd" > and the naïve implementation :py:class:`NaiveAllocator`.< / span >
< span class = "sd" > " " " < / span >
< span class = "kn" > from< / span > < span class = "nn" > Lib.Operands< / span > < span class = "kn" > import< / span > < span class = "n" > Temporary< / span > < span class = "p" > ,< / span > < span class = "n" > Operand< / span > < span class = "p" > ,< / span > < span class = "n" > DataLocation< / span > < span class = "p" > ,< / span > < span class = "n" > GP_REGS< / span >
< span class = "kn" > from< / span > < span class = "nn" > Lib.Statement< / span > < span class = "kn" > import< / span > < span class = "n" > Instruction< / span >
< span class = "kn" > from< / span > < span class = "nn" > Lib.Errors< / span > < span class = "kn" > import< / span > < span class = "n" > AllocationError< / span >
< span class = "kn" > from< / span > < span class = "nn" > Lib.FunctionData< / span > < span class = "kn" > import< / span > < span class = "n" > FunctionData< / span >
< span class = "kn" > from< / span > < span class = "nn" > typing< / span > < span class = "kn" > import< / span > < span class = "n" > Dict< / span > < span class = "p" > ,< / span > < span class = "n" > List< / span >
< div class = "viewcode-block" id = "Allocator" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.Allocator" > [docs]< / a > < span class = "k" > class< / span > < span class = "nc" > Allocator< / span > < span class = "p" > ():< / span >
< span class = "w" > < / span > < span class = "sd" > " " " General base class for Naive, AllInMem and Smart Allocators.< / span >
< span class = "sd" > Replace all temporaries in the code with actual data locations.< / span >
< span class = "sd" > Allocation is done in two steps:< / span >
< span class = "sd" > - First, :py:meth:`prepare` is responsible for calling< / span >
< span class = "sd" > :py:meth:`Lib.Operands.TemporaryPool.set_temp_allocation`< / span >
< span class = "sd" > with a mapping from temporaries to where they should actually be stored< / span >
< span class = "sd" > (in registers or in memory).< / span >
< span class = "sd" > - Then, :py:meth:`replace` is called for each instruction in order to< / span >
< span class = "sd" > replace the temporary operands with the previously assigned locations< / span >
< span class = "sd" > (and possibly add some instructions before or after).< / span >
< span class = "sd" > Concretely, it returns a list of instructions that should replace the original< / span >
< span class = "sd" > instruction. The actual iteration over all the instructions is handled transparently< / span >
< span class = "sd" > by :py:meth:`Lib.LinearCode.LinearCode.iter_statements`.< / span >
< span class = "sd" > " " " < / span >
< span class = "n" > _fdata< / span > < span class = "p" > :< / span > < span class = "n" > FunctionData< / span >
< span class = "k" > def< / span > < span class = "fm" > __init__< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > fdata< / span > < span class = "p" > :< / span > < span class = "n" > FunctionData< / span > < span class = "p" > ):< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _fdata< / span > < span class = "o" > =< / span > < span class = "n" > fdata< / span >
< div class = "viewcode-block" id = "Allocator.prepare" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.Allocator.prepare" > [docs]< / a > < span class = "k" > def< / span > < span class = "nf" > prepare< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > )< / span > < span class = "o" > -> < / span > < span class = "kc" > None< / span > < span class = "p" > :< / span > < span class = "c1" > # pragma: no cover< / span >
< span class = "k" > pass< / span > < / div >
< div class = "viewcode-block" id = "Allocator.replace" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.Allocator.replace" > [docs]< / a > < span class = "k" > def< / span > < span class = "nf" > replace< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > old_instr< / span > < span class = "p" > :< / span > < span class = "n" > Instruction< / span > < span class = "p" > )< / span > < span class = "o" > -> < / span > < span class = "n" > List< / span > < span class = "p" > [< / span > < span class = "n" > Instruction< / span > < span class = "p" > ]:< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Transform an instruction with temporaries into a list of instructions." " " < / span >
< span class = "k" > return< / span > < span class = "p" > [< / span > < span class = "n" > old_instr< / span > < span class = "p" > ]< / span > < / div >
< div class = "viewcode-block" id = "Allocator.rewriteCode" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.Allocator.rewriteCode" > [docs]< / a > < span class = "k" > def< / span > < span class = "nf" > rewriteCode< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > listcode< / span > < span class = "p" > )< / span > < span class = "o" > -> < / span > < span class = "kc" > None< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Modify the code to replace temporaries with< / span >
< span class = "sd" > registers or memory locations.< / span >
< span class = "sd" > " " " < / span >
< span class = "n" > listcode< / span > < span class = "o" > .< / span > < span class = "n" > iter_statements< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > replace< / span > < span class = "p" > )< / span > < / div > < / div >
< div class = "viewcode-block" id = "NaiveAllocator" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.NaiveAllocator" > [docs]< / a > < span class = "k" > class< / span > < span class = "nc" > NaiveAllocator< / span > < span class = "p" > (< / span > < span class = "n" > Allocator< / span > < span class = "p" > ):< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Naive Allocator: try to assign a register to each temporary,< / span >
< span class = "sd" > fails if there are more temporaries than registers.< / span >
< span class = "sd" > " " " < / span >
< div class = "viewcode-block" id = "NaiveAllocator.replace" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.NaiveAllocator.replace" > [docs]< / a > < span class = "k" > def< / span > < span class = "nf" > replace< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > ,< / span > < span class = "n" > old_instr< / span > < span class = "p" > :< / span > < span class = "n" > Instruction< / span > < span class = "p" > )< / span > < span class = "o" > -> < / span > < span class = "n" > List< / span > < span class = "p" > [< / span > < span class = "n" > Instruction< / span > < span class = "p" > ]:< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Replace Temporary operands with the corresponding allocated Register." " " < / span >
< span class = "n" > new_args< / span > < span class = "p" > :< / span > < span class = "n" > List< / span > < span class = "p" > [< / span > < span class = "n" > Operand< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "p" > []< / span >
< span class = "k" > for< / span > < span class = "n" > arg< / span > < span class = "ow" > in< / span > < span class = "n" > old_instr< / span > < span class = "o" > .< / span > < span class = "n" > args< / span > < span class = "p" > ():< / span >
< span class = "k" > if< / span > < span class = "nb" > isinstance< / span > < span class = "p" > (< / span > < span class = "n" > arg< / span > < span class = "p" > ,< / span > < span class = "n" > Temporary< / span > < span class = "p" > ):< / span >
< span class = "n" > new_args< / span > < span class = "o" > .< / span > < span class = "n" > append< / span > < span class = "p" > (< / span > < span class = "n" > arg< / span > < span class = "o" > .< / span > < span class = "n" > get_alloced_loc< / span > < span class = "p" > ())< / span >
< span class = "k" > else< / span > < span class = "p" > :< / span >
< span class = "n" > new_args< / span > < span class = "o" > .< / span > < span class = "n" > append< / span > < span class = "p" > (< / span > < span class = "n" > arg< / span > < span class = "p" > )< / span >
< span class = "n" > new_instr< / span > < span class = "o" > =< / span > < span class = "n" > old_instr< / span > < span class = "o" > .< / span > < span class = "n" > with_args< / span > < span class = "p" > (< / span > < span class = "n" > new_args< / span > < span class = "p" > )< / span >
< span class = "k" > return< / span > < span class = "p" > [< / span > < span class = "n" > new_instr< / span > < span class = "p" > ]< / span > < / div >
< div class = "viewcode-block" id = "NaiveAllocator.prepare" > < a class = "viewcode-back" href = "../../api/Lib.Allocator.html#Lib.Allocator.NaiveAllocator.prepare" > [docs]< / a > < span class = "k" > def< / span > < span class = "nf" > prepare< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "p" > )< / span > < span class = "o" > -> < / span > < span class = "kc" > None< / span > < span class = "p" > :< / span >
< span class = "w" > < / span > < span class = "sd" > " " " Allocate all temporaries to registers.< / span >
< span class = "sd" > Fail if there are too many temporaries." " " < / span >
< span class = "n" > regs< / span > < span class = "o" > =< / span > < span class = "nb" > list< / span > < span class = "p" > (< / span > < span class = "n" > GP_REGS< / span > < span class = "p" > )< / span > < span class = "c1" > # Get a writable copy< / span >
< span class = "n" > temp_allocation< / span > < span class = "p" > :< / span > < span class = "n" > Dict< / span > < span class = "p" > [< / span > < span class = "n" > Temporary< / span > < span class = "p" > ,< / span > < span class = "n" > DataLocation< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "nb" > dict< / span > < span class = "p" > ()< / span >
< span class = "k" > for< / span > < span class = "n" > tmp< / span > < span class = "ow" > in< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _fdata< / span > < span class = "o" > .< / span > < span class = "n" > _pool< / span > < span class = "o" > .< / span > < span class = "n" > get_all_temps< / span > < span class = "p" > ():< / span >
< span class = "k" > try< / span > < span class = "p" > :< / span >
< span class = "n" > reg< / span > < span class = "o" > =< / span > < span class = "n" > regs< / span > < span class = "o" > .< / span > < span class = "n" > pop< / span > < span class = "p" > ()< / span >
< span class = "k" > except< / span > < span class = "ne" > IndexError< / span > < span class = "p" > :< / span >
< span class = "k" > raise< / span > < span class = "n" > AllocationError< / span > < span class = "p" > (< / span >
< span class = "s2" > " Too many temporaries (< / span > < span class = "si" > {}< / span > < span class = "s2" > ) for the naive allocation, sorry." < / span >
< span class = "o" > .< / span > < span class = "n" > format< / span > < span class = "p" > (< / span > < span class = "nb" > len< / span > < span class = "p" > (< / span > < span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _fdata< / span > < span class = "o" > .< / span > < span class = "n" > _pool< / span > < span class = "o" > .< / span > < span class = "n" > get_all_temps< / span > < span class = "p" > ())))< / span >
< span class = "n" > temp_allocation< / span > < span class = "p" > [< / span > < span class = "n" > tmp< / span > < span class = "p" > ]< / span > < span class = "o" > =< / span > < span class = "n" > reg< / span >
< span class = "bp" > self< / span > < span class = "o" > .< / span > < span class = "n" > _fdata< / span > < span class = "o" > .< / span > < span class = "n" > _pool< / span > < span class = "o" > .< / span > < span class = "n" > set_temp_allocation< / span > < span class = "p" > (< / span > < span class = "n" > temp_allocation< / span > < span class = "p" > )< / span > < / div > < / div >
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