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June 2. 01. 6 This article applies to the Oracle Developer Studio previously known as Oracle Solaris Studio compilers. The principal cause of problems when converting 3. When converting 3. This can cause trouble with data truncation when assigning pointer or long types to int types. Also, problems with sign extension can occur when assigning expressions using types shorter than the size of an int to an unsigned long or a pointer. This article discusses how to avoid or eliminate these problems. Consider the Differences Between the 3. Data Models. The biggest difference between the 3. The C data type model for 3. ILP3. 2 model, so named because the int and long types, and pointers, are 3. The data type model for 6. LP6. 4 data model, so named because long and pointer types grow to 6. The remaining C integer types and the floating point types are the same in both data type models. It is not unusual for current 3. Because the size of long and pointer change in the LP6. ILP3. 2 to LP6. Use the lint Utility to Detect Problems with 6. Solaris is a Unix operating system originally developed by Sun Microsystems. It superseded their earlier SunOS in 1993. In 2010, after the Sun acquisition by Oracle. Enlaces de los ISO oficiales de descarga desde DigitalRiver de Microsoft Windows 7 y Windows 8. Windows 10 en espaol e Ingls para instalacin limpia. Solaris 10 64 Bit Iso' title='Solaris 10 64 Bit Iso' />Pointer Types. Use lint to check code that is written for both the 3. Specify the errchklongptr. LP6. 4 warnings. Also use the errchklongptr. The errchklongptr. Use the errchklongptr. ISO C value preserving rules allow the extension of the sign of a signed integral value in an expression of unsigned integral type. Use the m. Solaris 6. SPARC or x. When lint generates warnings, it prints the line number of the offending code, a message that describes the problem, and whether or not a pointer is involved. The warning message also indicates the sizes of the involved data types. When you know a pointer is involved and you know the size of the data types, you can find specific 6. You can suppress the warning for a given line of code by placing a comment of the form NOTELINTEDlt optional message on the previous line. This is useful when you want lint to ignore certain lines of code such as casts and assignments. Exercise extreme care when you use the NOTELINTEDlt optional message comment because it can mask real problems. When you use NOTE, also include includelt note. Refer to the lint man page for more information. Check for Changes of Pointer Size With Respect to the Size of Plain Integers. Since plain integers and pointers are the same size in the ILP3. Pointers are often cast to int or unsigned int for address arithmetic. You can cast your pointers to unsigned long because long and pointer types are the same size in both ILP3. LP6. 4 data type models. However, rather than explicitly using unsigned long, use uintptrt instead because it expresses your intent more closely and makes the code more portable, insulating it against future changes. To use the uintptrt and intptrt you need to include lt inttypes. Consider the following example char p p char intp PAGEOFFSET cc. The following version will function correctly when compiled to both 3. PAGEOFFSET Check for Changes in Size of Long Integers With Respect to the Size of Plain Integers. Because integers and longs are never really distinguished in the ILP3. Modify any code that uses integers and longs interchangeably so it conforms to the requirements of both the ILP3. LP6. 4 data type models. While an integer and a long are both 3. ILP3. 2 data type model, a long is 6. LP6. 4 data type model. Dpc2100 Firmware Update more. Consider the following example int waiting long wio long wswap. Check for Sign Extensions. Sign extension is a common problem when you convert to the 6. To prevent sign extension problems, use explicit casting to achieve the intended results. To understand why sign extension occurs, it helps to understand the conversion rules for ISO C. The conversion rules that seem to cause the most sign extension problems between the 3. Integral promotion. You can use a char, short, enumerated type, or bit field, whether signed or unsigned, in any expression that calls for an integer. If an integer can hold all possible values of the original type, the value is converted to an integer otherwise, the value is converted to an unsigned integer. Conversion between signed and unsigned integers. When an integer with a negative sign is promoted to an unsigned integer of the same or larger type, it is first promoted to the signed equivalent of the larger type, then converted to the unsigned value. When the following example is compiled as a 6. Sign extension hereNo sign extension here This sign extension occurs because the conversion rules are applied as follows The structure member a. In other words, because the unsigned 1. Thus, the expression a. If the result were assigned to an unsigned int, this would not matter because no sign extension has yet occurred. The expression a. The sign extension occurs when performing the int to long conversion. Thus, when compiled as a 6. When compiled as a 3. Check Structure Packing. Check the internal data structures in an applications for holes that is, extra padding appearing between fields in the structure to meet alignment requirements. This extra padding is allocated when long or pointer fields grow to 6. LP6. 4 data type model, and appear after an int that remains at 3. Since long and pointer types are 6. LP6. 4 data type model, padding appears between the int and long or pointer type. In the following example, member p is 6. Also, structures are aligned to the size of the largest member within them. Thus, in the above structure, padding appears between member i and member j. When you repack a structure, follow the simple rule of moving the long and pointer fields to the beginning of the structure. Consider the following structure definition struct bar char long j int i int k sizeof struct bar 2. Check for Unbalanced Size of Union Members. Tkinter Tutorial Python Pdf Library here. Be sure to check the members of unions because their fields can change size between the ILP3. LP6. 4 data type models, making the size of the members different. In the following union, member d and member array l are the same size in the ILP3. LP6. 4 model because long types grow to 6. LP6. 4 model, but double types do not. The size of the members can be rebalanced by changing the type of the l array member from type long to type int. Make Sure Constant Types are Used in Constant Expressions. A lack of precision can cause the loss of data in some constant expressions. Be explicit when you specify the data types in your constant expression. Specify the type of each integer constant by adding some combination of u,U,l,L. You can also use casts to specify the type of a constant expression. Consider the following example int i 3. RHS is integer expression The above code can be made to work as intended, by appending the type to the constant, 1, as follows int i 3. L lt lt i now j will get 0x. Check Format String Conversions. Make sure the format strings for printf3.