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llvm-svn: 44831
This commit is contained in:
Devang Patel 2007-12-11 00:54:19 +00:00
parent ab6aadb34a
commit 113bd8be70
1 changed files with 20 additions and 12 deletions
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32
clang/CodeGen/CodeGenTypes.cpp
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@ -66,12 +66,16 @@ namespace {
} }
/// fixCursorPosition - When bit-field is followed by a normal field /// fixCursorPosition - When bit-field is followed by a normal field
/// then cursor position may require some adjustments. For example, /// cursor position may require some adjustments.
/// struct { char a; short b:2; char c; }; ///
/// At the beginning of 'c' during layout, cursor position is 10. /// For example, struct { char a; short b:2; char c; };
/// However, only one llvm struct field is allocated and it is i8. ///
/// This happens because 'b' shares llvm field with 'a'. /// At the beginning of field 'c' layout, cursor position is 10.
/// Similar adjustment may be required if bit-field is last field. /// However, only llvm struct field allocated so far is of type i8.
/// This happens because 'b' shares llvm field with 'a'. Add padding
/// field of i8 type and reposition cursor to point at 16. This
/// should be done only if next field (i.e. 'c' here) is not a bit-field
/// or last record field is a bit-field.
void fixCursorPosition(const ASTRecordLayout &RL); void fixCursorPosition(const ASTRecordLayout &RL);
private: private:
@ -570,12 +574,16 @@ void RecordOrganizer::layoutUnionFields() {
} }
/// fixCursorPosition - When bit-field is followed by a normal field /// fixCursorPosition - When bit-field is followed by a normal field
/// then cursor position may require some adjustments. For example, /// cursor position may require some adjustments.
/// struct { char a; short b:2; char c; }; ///
/// At the beginning of 'c' during layout, cursor position is 10. /// For example, struct { char a; short b:2; char c; };
/// However, only one llvm struct field is allocated so far is i8. ///
/// This happens because 'b' shares llvm field with 'a'. /// At the beginning of field 'c' layout, cursor position is 10.
/// Similar adjustment may be required if last record field is a bit-field. /// However, only llvm struct field allocated so far is of type i8.
/// This happens because 'b' shares llvm field with 'a'. Add padding
/// field of i8 type and reposition cursor to point at 16. This
/// should be done only if next field (i.e. 'c' here) is not a bit-field
/// or last record field is a bit-field.
void RecordOrganizer::fixCursorPosition(const ASTRecordLayout &RL) { void RecordOrganizer::fixCursorPosition(const ASTRecordLayout &RL) {
uint64_t llvmSize = 0; uint64_t llvmSize = 0;
for(std::vector<const llvm::Type*>::iterator LI = LLVMFields.begin(), for(std::vector<const llvm::Type*>::iterator LI = LLVMFields.begin(),