F77Ccompiler

Compiler from Fortran-77 to C language

Build requirements

• flex=2.6.4
• bison=3.5.1
• g++=9.3.0
• gcc=9.3.0
• cmake=3.16.3
• f77lexer.l, f77parser.y, all contens of src/*

Runtime requirements

• f77.h file at working directory
• don't forget to link math library during compilation -lm

Usage

• bash scripts/build.sh or 3 following commands
  • bison -o "${PROJECT_DIR}/src/f77parser.c" "${PROJECT_DIR}/f77parser.y" -d
  • flex -o "${PROJECT_DIR}/src/f77lexer.c" "${PROJECT_DIR}/f77lexer.l"
  • g++ -o lexer src/classes.cpp src/classes.h src/defs.h src/f77parser.h src/f77lexer.c src/f77parser.c src/utils.h src/utils.cpp src/debug.h src/global.h -lm
• bash scripts/translate.sh <input_file> <output_file> by default it translates example.f to example.c
• or you could directly ran executable "${PROJECT_DIR}/cmake-build-debug/lexer" using stdin for Fortran77 and stdout for C
• running executable file with -d flag outputs fortran code tokenization to stderr

Supported statements

• declaration and assignments for basic types logical, integer, real, character*n, double precision, complex
• constants of types described above
• arithmetical operators +, -, *, /, **, ()
• comparison operators .eq., .ne., .lt., .le., .gt., .ge.
• binary operators .eqv., .neqv., .or., .not., .and., .xor.
• simple if statement if (<expression>) then ... else if (<expression>) then ... endif
• simple do statement
  • do var=<l>, <r> [, <step>] ... enddo
  • do while(expression) ... enddo
• function definition
  • [<type>] function ([varlist]) ... end
  • subroutine ([varlist]) ... end
• stop
• pause <number>
• open(<unit>, file=<filename>)
• close(<unit>)
• print *, [iolist]
• write statements
  • write (<unit>, *) [iolist]
  • write (<unit>) [iolist]
• read statements (empty iolists are not allowed)
  • read *, [iolist]
  • read (<unit>) [iolist]
  • read (<unit>, *) [iolist]
• label statements <number> stmt
• goto <label>