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From: luda_f <luda_f@sina.com>
To: gcc@gcc.gnu.org
Subject: Usage of macro of gcc ?
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Date: Sun, 08 Dec 2002 19:14:00 -0000
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X-SW-Source: 2002-12/txt/msg00446.txt.bz2

Dear friends, 



I have a question in using GCC macros. May I have your help? Thanks a lot for your attention. 



For a expression of INDIRECT_REF or ADDR_EXPR, how can I get the variables from them? 

For example, for stament 

*p=&i; 



I have the code: 

expr = EXPR_STMT_EXPR(stmt); 

leftexpr = TREE_OPERAND(expr,0); 

rightexpr = TREE_OPERAND(expr,1); 



So we can get from it that: 

TREE_CODE(leftexpr)==INDIRECT_REF 

TREE_CODE(rightexpr)==ADDR_EXPR 



and how can I get variable p and i then? Is there some macros like EXPR_STMT_EXPR that can achieve this purpose? 



Thanks for your time! 



Wang Nan 

Software Engineering Institute 

Xidian University, P. R. China

______________________________________

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