Hello, I'm replacing a struct with another struct of a different size. A problem arises when the following line occurs in the source code: MyStruct *a = malloc(sizeof(a)); The 'sizeof(a)' is turned into a constant in the LLVM IR, resulting in the wrong amount of memory being allocated for the struct. Is there any way to find all the constants that have arisen from sizeof? Thanks, Peter -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20140409/298a3b0c/attachment.html>
a is a pointer.The size of a pointer always equals the size of an int,doesn't it? 在 2014-4-9 下午4:32，"Peter Conn" <conn.peter at gmail.com>写道：> Hello, > > I'm replacing a struct with another struct of a different size. A problem > arises when the following line occurs in the source code: > > MyStruct *a = malloc(sizeof(a)); > > The 'sizeof(a)' is turned into a constant in the LLVM IR, resulting in the > wrong amount of memory being allocated for the struct. Is there any way to > find all the constants that have arisen from sizeof? > > Thanks, Peter > > _______________________________________________ > LLVM Developers mailing list > LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu > http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev > >-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20140409/4ebb41a9/attachment.html>
Ah, sorry, I made a typo, I'd meant to write: MyStruct *a = malloc(sizeof(MyStruct)); On 9 April 2014 10:28, waxiadao at gmail.com <waxiadao at gmail.com> wrote:> a is a pointer.The size of a pointer always equals the size of an > int,doesn't it? > 在 2014-4-9 下午4:32，"Peter Conn" <conn.peter at gmail.com>写道： > >> Hello, >> >> I'm replacing a struct with another struct of a different size. A problem >> arises when the following line occurs in the source code: >> >> MyStruct *a = malloc(sizeof(a)); >> >> The 'sizeof(a)' is turned into a constant in the LLVM IR, resulting in >> the wrong amount of memory being allocated for the struct. Is there any way >> to find all the constants that have arisen from sizeof? >> >> Thanks, Peter >> >> _______________________________________________ >> LLVM Developers mailing list >> LLVMdev at cs.uiuc.edu http://llvm.cs.uiuc.edu >> http://lists.cs.uiuc.edu/mailman/listinfo/llvmdev >> >>-------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20140409/a910bb13/attachment.html>