Is it possible to get Lexer output from gcc or clang?

Is it possible to get Lexer output from gcc or clang?

By : user2955722
Date : November 22 2020, 10:48 AM
I wish this helpful for you Although the parser does poll the lexer without there being a proper "lexing phase" this does not mean that you cannot dump the tokens as they are lexed. This is done with the command :
code :
clang -Xclang -dump-tokens code.c

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what should the output of a lexer be in c?

what should the output of a lexer be in c?

By : David
Date : March 29 2020, 07:55 AM
may help you . the lexer just tokenizes the stream to turn a stream of characters into a stream of tokens (that will be parsed with a parser later to obtain a full syntax tree). For your example you would obtain something like:
code :
#include <stdio.h> (this is handled by preprocessor, not by lexer so it wouldn't exist)

printf IDENT
Is it possible to make Antlr4 generate lexer from base grammar lexer instead of gener Lexer?

Is it possible to make Antlr4 generate lexer from base grammar lexer instead of gener Lexer?

By : user70260
Date : March 29 2020, 07:55 AM
will help you This is not possible due to the way ANTLR 4 implements imports.
If grammar x imports grammar y, the operation behaves as follows:
clang and clang++ with ASAN generate different output

clang and clang++ with ASAN generate different output

By : Sam
Date : November 19 2020, 03:01 PM
will be helpful for those in need This seems to be a bug in Clang, could you file bug report in their tracker? (EDIT: this was [resolved as not-a-bug](Asan developers https://github.com/google/sanitizers/issues/872) so probly needs to be fixed by Bazel developers instead).
Some details: when you use ordinary clang, it decides not to link C++ part of Asan runtime as can be seen in Tools.cpp:
code :
if (SanArgs.linkCXXRuntimes())
LinkCXXRuntimes =
    Args.hasArg(options::OPT_fsanitize_link_cxx_runtime) || D.CCCIsCXX();
GCC/Clang lexer and parser

GCC/Clang lexer and parser

By : user3196259
Date : March 29 2020, 07:55 AM
To fix the issue you can do The traditional answer is close to your case 2, but not exactly that. Note that lexers and parsers are both typically implemented as relatively simple state machines.
The lexing state machine could be driven from either:
code :
for all input characters:
    feed character to tokenizer
Output of Lexer

Output of Lexer

By : Jenny Rodriguez
Date : March 29 2020, 07:55 AM
it helps some times In general, your lexer should produce a stream of structs that contain language elements: operators, identifiers, keywords, comments, etc. These structs should be marked with type of the lexeme, and carry content relevant to the type of lexeme it represents.
To enable good error reporting, it is good if each lexeme carries information about starting line and column, endline line and column (some lexemes span multiple lines), and the originating source file (sometimes a parser has to handle included files as well as the main file).
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