compiler-construction

问题 I've been learning about ssa (static single assignment form), and I was given the following graph with phi functions inserted, but the graph hasn't been renamed: I had to rename the variables, and this is what I got: I am very unsure that this is correct. Did I rename the variables correctly? Is this minimal ssa? I am using this algorithm from here (Cytron, et. al's paper) to rename the variables. Please help! :) 回答1: No, your graph is not correct. The phi-functions and renaming for x and y

问题 I've installed LLVM on my laptop but having problem compiling the Fibonacci example in llvm/examples/Fibonacci : clang++ -std=c++11 -I ../../include fibonacci.cpp -o fib /usr/local/include/llvm/Support/DataTypes.h:57:3: error: "Must #define __STDC_LIMIT_MACROS before #including Support/DataTypes.h" According to this question, I add some driver flags: clang++ fibonacci.cpp -std=c++11 -I ../../include -o fib -D__STDC_CONSTANT_MACROS -D__STDC_LIMIT_MACROS Different errors produced: Undefined

问题 This question already has answers here : Does the C++ code compile to assembly codes? (3 answers) Does a compiler always produce an assembly code? (4 answers) Closed 7 years ago . I have confusion. I am C++ developer and heard many times that my source code will first gets converted to assembly and then assembly will get converted to machine code. But in one of the video tutorial of assembly language, instructor clearly said, C/C++ code directly gets convert to machine code. (Of course there

问题 I'm working on a new language using the LLVM C++ API and would like to take advantage of optimization passes. ( Note: I'm currently using the latest from source LLVM which I believe equates to 3.8) I have yet to find any examples that use the new PassManager and even Clang is still utilizing the LegacyPassManager. I have come across posts such as this that are several years old now that mention the new PassManager, but they all still use the legacy system. Is there any examples/tutorials on

问题 I'm working on a new language using the LLVM C++ API and would like to take advantage of optimization passes. ( Note: I'm currently using the latest from source LLVM which I believe equates to 3.8) I have yet to find any examples that use the new PassManager and even Clang is still utilizing the LegacyPassManager. I have come across posts such as this that are several years old now that mention the new PassManager, but they all still use the legacy system. Is there any examples/tutorials on

问题 The following text is an excerpt from C Programming Language, 2nd Edition , written by the creator of the C language (so I presume it is correct): Although variables of enum types may be declared, compilers need not check that what you store in such a variable is a valid value for the enumeration. I have some doubts: For what cases in the C language doesn't the compiler check the value of an enum ? enum constants are not checked for some reason. Why not? What are the reasons? Since enum is

问题 The following text is an excerpt from C Programming Language, 2nd Edition , written by the creator of the C language (so I presume it is correct): Although variables of enum types may be declared, compilers need not check that what you store in such a variable is a valid value for the enumeration. I have some doubts: For what cases in the C language doesn't the compiler check the value of an enum ? enum constants are not checked for some reason. Why not? What are the reasons? Since enum is

问题 I'm trying to compile my code to test a function to read and print a data file, but I get a compiling error that I don't understand - "error: expected constructor, destructor, or type conversion before ';' token". Wall of relevant code-text is below. struct Day { int DayNum; int TempMax; int TempMin; double Precip; int TempRange; }; struct Month { Day Days[31]; int MonthMaxTemp; int MonthMinTemp; double TotalPrecip; int MonthMaxTempRange; int MonthMinTempRange; double AverageMaxTemp; double

问题 I'm trying to compile my code to test a function to read and print a data file, but I get a compiling error that I don't understand - "error: expected constructor, destructor, or type conversion before ';' token". Wall of relevant code-text is below. struct Day { int DayNum; int TempMax; int TempMin; double Precip; int TempRange; }; struct Month { Day Days[31]; int MonthMaxTemp; int MonthMinTemp; double TotalPrecip; int MonthMaxTempRange; int MonthMinTempRange; double AverageMaxTemp; double

问题 I'm trying to compile my code to test a function to read and print a data file, but I get a compiling error that I don't understand - "error: expected constructor, destructor, or type conversion before ';' token". Wall of relevant code-text is below. struct Day { int DayNum; int TempMax; int TempMin; double Precip; int TempRange; }; struct Month { Day Days[31]; int MonthMaxTemp; int MonthMinTemp; double TotalPrecip; int MonthMaxTempRange; int MonthMinTempRange; double AverageMaxTemp; double