logo
down
shadow

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


Share : facebook icon twitter icon
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)

int KEYWORD
main IDENTIFIER
( LPAR
) RPAR
{ LBRACE
int KEYWORD
a IDENT
, COMMA
b IDENT
; SEMICOL
a IDENT
= ASSIGN
a IDENT
+ PLUS
b IDENT
; SEMICOL
printf IDENT
( LPAR
"%d" STRING
, COMMA
a IDENT
) RPAR
; SEMICOL
return RETURN_KEYWORD
0 INTEGER
; SEMICOL
} RBRACE
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())
  StaticRuntimes.push_back("asan_cxx");
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).
Related Posts Related Posts :
  • Vector of pointers: some clarification needed
  • scaling a bitmap without losing quality
  • How to evaluate a function directly?
  • QNetworkAccessManager: How to change post data at createRequest function
  • Returning std::move of a local variable
  • Is there a fast linear SVM library with a good C++ interface?
  • What is the purpose of name mangling in C++?
  • C++ Why the void function is not working eventhough I called it?
  • How the pointer and the pointer's adress can share the same memory adress?
  • error C2220: warning treated as error - no 'object' file generated
  • exception of strcpy function in c++ console program
  • How to access USB barcode scanner data directly from USB port using C/C++ without driver
  • Under which circumstances will std::vector.clear() call a destructor?
  • Template partial specialisation and dependent names
  • best way to share data between c codes
  • C++ ignores if statement conditions
  • How to set the argv[ ] to be case-insensitive in a Win32 Console Application?
  • How to fix error "clang: error: linker (via gcc) command failed with exit code 1 (use -v to see invocation)"?
  • C++ How do I print a .txt file verbatim?
  • Creating two dimensional array of class
  • How do I correctly use COMMTIMEOUTS with OVERLAPPED IO mode reading from a Serial port
  • An assert macro which expands to static_assert when possible?
  • How to write a copyconstructor for a class which has HANDLE as a member in win32 c++ application?
  • C++ saving info such as tree in a file
  • Transforming an expression template tree
  • How to overload an operator with multiple parameters like a + b + c?
  • C++ 11 with Raspberry Pi performances
  • Make a C++ class look like a numpy array using swig
  • Postfix incrementer overloading for nested enumerated types
  • Is there a tidy way of associating metadata with functions in C++
  • QObject::installEventFilter(): Cannot filter events for objects in a different thread
  • LNK2005 error with Zxing C++
  • C++ Doubly Linked List with Pointers: Object of class isn't constructed properly
  • Using a random string generator in c++ constructor
  • What should I use instead of void as one of the alternative types in an variant?
  • C++ return value from multithreads using reference
  • How to connect multiple TCP IP clients to same server port using c++
  • Defaul compiler generates the reference operator (In C++)?
  • Unable to change directory time stamp after using FILE_FLAG_BACKUP_SEMANTICS
  • vector handling displaying output
  • WSAGetLastError returns WSAENOTSOCK - Cause?
  • C++: How to overload pow for user type?
  • C++ using arrays as multidimensional despite initalising it as 1D with pointer
  • How negate std::is_integral for use in tag dispatch?
  • Retrieve serial number from USB memory (Windows environment c++)
  • g++ error: invalid preprocessing directive #INCLUDE
  • C++ What is the std::for_each() function parameter type?
  • C++: Read individual lines from text file, sort words alphabetically
  • Saving 'this' address into a variable
  • c++ command line arguments in ubuntu terminal
  • Convert "Cartesian coordinates" to "polar coordinates with respect to user specified origin"
  • In what order are local scoped objects destructed?
  • How to use SDL_MapRGB with SDL 2.0
  • how compiler and interpreter work in case of array declaration
  • GSL integration behaves strange
  • Cropping an image with OpenCV and C
  • Find the last line in text file and select the first 10 char and print to a new file?
  • Created many CCSprits but when triggering ccTouchBegan gives the last one allways
  • seekp and seekg don't work with fstream
  • Taking input in Sublime Text 3
  • shadow
    Privacy Policy - Terms - Contact Us © ourworld-yourmove.org