Am 23.03.2011 18:16, schrieb duck donal: > Hi Krish, > Thank u for the detail! > Actually I've konwn the three stages. > What I want to konw is the anatomy of each stage.e.g,for compile > stage,a c source file need to pasing,generating icode etc,I want to konw > that what's the Intermediate language of SDCC,does it generate a > language like the RTL of GCC?What is the difference between SDCC and > GCC? The syntax tree,the register allocation method and so on? > The SDCC manual is too abbreviated to understand well. > Could u give me a detail explanation?Or give me some detail materials? > Much thanks! > Donald
sdcc follows the classic model of compiler stages (and AFAIK so does gcc; llvm on the otehr hand is quite different). The parser is a classic yacc parser (see SDCC.y, SDCCy.?) with a lex lexer (SDCC.lex, SDCClex.c) We generate an abstract syntax tree (SDCCast.?). Next is the intermediate language, which is mostly three-address code (SDCCicode.?). Some optimizations, e.g. common subexpression elimination (SDCCcse.?) and other transformations are done on the intermediate code. That's it for the non port-specific part. Next comes register allocation, then code generation (generates asm code) and the peephole optimizer (which does local optimizations on the asm code). These are port-specific. Philipp ------------------------------------------------------------------------------ Enable your software for Intel(R) Active Management Technology to meet the growing manageability and security demands of your customers. Businesses are taking advantage of Intel(R) vPro (TM) technology - will your software be a part of the solution? Download the Intel(R) Manageability Checker today! http://p.sf.net/sfu/intel-dev2devmar _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
