bison

I've been working through a tutorial on writing compilers with Flex, Bison, and LLVM (http://gnuu.org/2009/09/18/writing-your-own-toy-compiler/), and attempting to compile the final binary fails with many of the following "undefined reference" errors: g++ -o parser `llvm-config --libs core jit native --cxxflags --ldflags` *.cpp /tmp/ccl0CSyi.o: In function `NBinaryOperator::codeGen(CodeGenContext&)': codegen.cpp:(.text+0x2ce): undefined reference to `llvm::BinaryOperator::Create(llvm::Instruction::BinaryOps, llvm::Value*, llvm::Value*, llvm::Twine const&, llvm::BasicBlock*)' /tmp/ccl0CSyi.o:

I know how to make YACC generate an AST, but how do you actaully get it? I mean, how do you actaully get the value of the root node from YACC? Yacc only gives you back one node at a time, and it's always something that you just gave yacc at some earlier time, i.e., whatever you wanted to return from a reduced production or whatever you wanted to return from a terminal symbol. (Sorry, you said you knew that, but some people reading this might not.) So, take whatever you woud have returned from the root or top rule, and save it (in your attached C reduction code) any way you like. What Yacc

I'll refer to this question for some of the background: Regular expression for a string literal in flex/lex The problem I am having is handling the input with escaped characters in my lexer and I think it may be an issue to do with the encoding of the string, but I'm not sure. Here's is how I am handling string literals in my lexer: \"(\\.|[^\\"])*\" { char* text1 = strndup(yytext + 1, strlen(yytext) - 2); char* text2 = "text\n"; printf("value = <%s> <%x>\n", text1, text1); printf("value = <%s> <%x>\n", text2, text2); } This outputs the following: value = <text\n"> <15a1bb0> value = <text >

With Bison, I figured out how to get everything into one long string as follows: arg_list: WORD arg_list { strcat( $1, "IFS" ); $$ = strcat($1, $2); } | WORD ; and: WORD arg_list { printf("%s, %s\n", $1, $2); } But the problem is that I will then have to split up $2 in the second rule again to parse it. Is there a way to populate an array instead of just using concatenation? Am I going about this the wrong way? If I need to build something like a linked list that could make sense, just not sure what would be the proper way to bind to arg_list, and then clean up the memory. If you have an array

#include <stdio.h> #include <stdlib.h> struct NODE { char* name; int val; struct NODE* next; }; typedef struct NODE Node; Node *head, *tail; head = (Node*) malloc( sizeof( Node ) ); //line 21 And I compiling like this: cc -g -c -o file.tab.o file.tab.c I'm getting this error message: file.y:21:1 warning: data definition has no type or storage class [enabled by default] Natan Streppel It looks like the line head = (Node*) malloc( sizeof( Node ) ); //line 21 is outside the main() function. You can't do that, because you can't execute code outside functions. The only thing you can do at global