81 lines
3.8 KiB
Factor
81 lines
3.8 KiB
Factor
USING: compiler.cfg.instructions compiler.cfg.rpo
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compiler.cfg.stack-frame compiler.cfg.stacks.local compiler.tree
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cpu.x86.assembler.operands help.markup help.syntax kernel math
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namespaces sequences vectors words ;
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IN: compiler.cfg
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HELP: basic-block
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{ $class-description
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"Factors representation of a basic block in the Call Flow Graph (CFG). A basic block is a sequence of instructions that always are executed sequentially and doesn't contain any internal branching. It has the following slots:"
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{ $table
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{
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{ $slot "number" }
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{ "The blocks sequence number. Generated by calling " { $link number-blocks } ". " }
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}
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{
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{ $slot "successors" }
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{ "A " { $link vector } " of basic blocks that may be executed directly after this block. Most blocks only have one successor but a block that checks where an if-condition should branch to would have two for example." }
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}
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{
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{ $slot "predecessors" }
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{ "The opposite of successors -- a " { $link vector } " of basic blocks from which the execution may have arrived into this block." }
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}
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{
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{ $slot "instructions" }
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{ "A " { $link vector } " of " { $link insn } " tuples which form the instructions of the basic block." }
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}
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{
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{ $slot "kill-block?" }
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{ "The first and the last block in a cfg and all blocks containing " { $link ##call } " instructions are kill blocks. Kill blocks can't be optimized so they are omitted from certain optimization steps." }
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}
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{
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{ $slot "height" }
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"Block's height as a " { $link height-state } ". What the heights of the block was at entry and how much they were increased in the block."
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}
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{
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{ $slot "replaces" }
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{ "Used by " { $vocab-link "compiler.cfg.stacks.local" } " for local stack analysis." }
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}
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{
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{ $slot "peeks" }
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{ "Used by " { $vocab-link "compiler.cfg.stacks.local" } " for local stack analysis." }
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}
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{
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{ $slot "kills" }
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{ "Used by " { $vocab-link "compiler.cfg.stacks.local" } " for local stack analysis." }
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}
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}
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}
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{ $notes "A basic-block is an " { $link identity-tuple } " becase it is used as a hash table key by the compiler." } ;
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HELP: <basic-block>
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{ $values { "bb" basic-block } }
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{ $description "Creates a new empty basic block. The " { $slot "id" } " slot is initialized with the value of the basic-block " { $link counter } "." } ;
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HELP: <cfg>
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{ $values { "word" word } { "label" "label" } { "entry" basic-block } { "cfg" cfg } }
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{ $description "Constructor for " { $link cfg } ". " { $slot "spill-area-size" } " and " { $slot "spill-area-align" } " are set to default values." } ;
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HELP: cfg
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{ $class-description
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"Call flow graph. It has the following slots:"
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{ $table
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{ { $slot "entry" } { "Root " { $link basic-block } " of the graph." } }
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{ { $slot "word" } { "The " { $link word } " the cfg is produced from." } }
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{ { $slot "post-order" } { "The blocks of the cfg in a post order traversal " { $link sequence } "." } }
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{ { $slot "stack-frame" } { { $link stack-frame } " of the cfg." } }
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{ { $slot "frame-pointer?" } { "Whether the cfg needs a frame pointer. Only cfgs generated for " { $link #alien-callback } " nodes does need it. If the slot is " { $link t } ", then the frame pointer register (" { $link RBP } " on x86.64 archs) will not be clobbered by register allocation. See " { $vocab-link "compiler.cfg.linear-scan" } " for details." } }
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}
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}
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{ $see-also <cfg> post-order } ;
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HELP: cfg-changed
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{ $values { "cfg" cfg } }
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{ $description "Resets all \"calculated\" slots in the cfg which forces them to be recalculated." }
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{ $see-also predecessors-changed } ;
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HELP: spill-offset
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{ $values { "n" integer } { "offset" integer } }
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{ $description "Offset in the current " { $link stack-frame } " to byte at index 'n' in the spill area." } ;
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