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| author | Bernhard Schommer <bernhardschommer@gmail.com> | 2017-01-20 10:55:26 +0100 |
|---|---|---|
| committer | Bernhard Schommer <bernhardschommer@gmail.com> | 2017-01-20 10:55:26 +0100 |
| commit | 55937c177f90ecf0dea40c318d2f8d52fa69b55d (patch) | |
| tree | 493a207959cd64f6b3419dc109d246df35b01e54 /cparser/pre_parser.mly | |
| parent | efaf1cf1c47370ab23db190fc4c2c1f3ad05323e (diff) | |
| download | compcert-kvx-55937c177f90ecf0dea40c318d2f8d52fa69b55d.tar.gz compcert-kvx-55937c177f90ecf0dea40c318d2f8d52fa69b55d.zip | |
Implement offsetof via builtin.
The implementation of offsetof as macro in the form
((size_t) &((ty*) NULL)->member) has the problem that it cannot be
used everywhere were an integer constant expression is allowed,
for example in initiliazers of global variables and there is also
no check for the case that member is of bitifield type.
The new implementation adds a builtin function for this which is
replaced by an integer constant during elaboration.
Bug 20765
Diffstat (limited to 'cparser/pre_parser.mly')
| -rw-r--r-- | cparser/pre_parser.mly | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/cparser/pre_parser.mly b/cparser/pre_parser.mly index 613ec17f..1c917b23 100644 --- a/cparser/pre_parser.mly +++ b/cparser/pre_parser.mly @@ -57,7 +57,7 @@ AUTO REGISTER INLINE NORETURN CHAR SHORT INT LONG SIGNED UNSIGNED FLOAT DOUBLE UNDERSCORE_BOOL CONST VOLATILE VOID STRUCT UNION ENUM CASE DEFAULT IF ELSE SWITCH WHILE DO FOR GOTO CONTINUE BREAK RETURN BUILTIN_VA_ARG ALIGNOF - ATTRIBUTE ALIGNAS PACKED ASM + ATTRIBUTE ALIGNAS PACKED ASM BUILTIN_OFFSETOF %token EOF @@ -254,6 +254,7 @@ postfix_expression: | postfix_expression LBRACK expression RBRACK | postfix_expression LPAREN argument_expression_list? RPAREN | BUILTIN_VA_ARG LPAREN assignment_expression COMMA type_name RPAREN +| BUILTIN_OFFSETOF LPAREN type_name COMMA other_identifier RPAREN | postfix_expression DOT other_identifier | postfix_expression PTR other_identifier | postfix_expression INC |