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To make this process executable, it is necessary to relate it to processes running in the human mind, because that is where the most complete data analysis is executed. The most important solution used to semantically analyze data is the process consisting in extracting semantic information contained in these sets. Lidia Ogiela, in Cognitive Information Systems in Management Sciences, 2017 2.2 Data Analysis Techniques
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On the other hand, semantic analysis is easier to perform during a separate traversal of a syntax tree, because that tree reflects the program's semantic structure better than the parse tree does, especially with a top-down parser, and because one has the option of traversing the tree in an order other than that chosen by the parser. The resulting space savings were important for previous generations of computers, which had very small main memories.
#Semantic analysis in compiler design pdf code
Moreover, it is often possible to write the intermediate code to an output file on the fly, rather than accumulating it in the attributes of the root of the parse tree.
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If intermediate code generation is interleaved with parsing, one need not build a syntax tree at all (unless of course the syntax tree is the intermediate code). 4 It is unclear whether interleaving semantic analysis with parsing makes a compiler simpler or more complex it's mainly a matter of taste. Scott, in Programming Language Pragmatics (Third Edition), 2009 One-Pass CompilersĪ compiler that interleaves semantic analysis and code generation with parsing is said to be a one-pass compiler.