![]() ![]() get_jump () if target_block is not None : display_block ( blocks, target_block, seen ) label_else = Label () label_print = Label () bytecode = Bytecode () blocks = ControlFlowGraph. next_block, seen ) # display the block linked by jump (if any) target_block = block. next_block is not None : display_block ( blocks, block. This is generally good enough for simple memory-safe instruction sets such as CIL and the JVM. These instructions do not target a specific machine. verts stack-based byte code into 3-address code, making it easier for the developer to. next_block ))) print () # display the next block if block. The easiest, and probably most efficient way to construct a control flow graph using Echo is using a static control flow graph builder. LLVM represents programs as sequences of instructions called bytecodes. To perform the analysis, we construct a control flow graph (CFG) for Java bytecode not only at the intraprocedural level but also at the interprocedural level. Figure 2.4: Control-flow graph for exception flow(listing 2.4). next_block is not None : print ( " => " % ( 1 + blocks. name, arg )) # is the block followed directly by another block? if block. arg ) else : arg = '' print ( " %s %s " % ( instr. arg, BasicBlock ): arg = "" % ( 1 + blocks. get_block_index ( block ))) for instr in block : if isinstance ( instr. add ( id ( block )) # display instructions of the block print ( "Block # %s " % ( 1 + blocks. from_bytecode ( bytecode ) display_blocks ( blocks )įrom bytecode import UNSET, Label, Instr, Bytecode, BasicBlock, ControlFlowGraph def display_block ( blocks, block, seen = None ): # avoid loop: remember which blocks were already seen if seen is None : seen = set () if id ( block ) in seen : return seen. next_block ))) print () label_else = Label () label_print = Label () bytecode = Bytecode () blocks = ControlFlowGraph. From bytecode import UNSET, Label, Instr, Bytecode, BasicBlock, ControlFlowGraph def display_blocks ( blocks ): for block in blocks : print ( "Block # %s " % ( 1 + blocks. ![]()
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