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This chapter considers a method for dealing with the occurrence of errors during the execution of programs. Recall that to this point we have been considering that evaluation of an expression could never go wrong, and neither could the execution of a command. In particular, in \(\mathsf {While^{int}}\) division by zero did not go wrong, and the range of arrays in \(\mathsf {While^{array}}\) was \(\mathbb {Z}\) . Finite ranges could not be supported, since there was no way to signal an error when some command tried to access a position of an array outside its range.

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Safety Properties

  • 章节

  • 发表日期：

    2026年

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  • José Bacelar Almeida,
  • Maria João Frade,
  • Jorge Sousa Pinto,
  • Simão Melo de Sousa

摘要

This chapter considers a method for dealing with the occurrence of errors during the execution of programs. Recall that to this point we have been considering that evaluation of an expression could never go wrong, and neither could the execution of a command. In particular, in \(\mathsf {While^{int}}\) division by zero did not go wrong, and the range of arrays in \(\mathsf {While^{array}}\) was \(\mathbb {Z}\) . Finite ranges could not be supported, since there was no way to signal an error when some command tried to access a position of an array outside its range.