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Parse and emit hidden visibility

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This adds parsing of (GCC compatible) visibility attribute
in order to mark selected global symbols as hidden.  The generated
.o files contain hidden symbols already, the TCC linker doesn't
yet do the right thing.
This commit is contained in:
Michael Matz
2014-04-14 02:53:11 +02:00
parent 112148172b
commit fbda78aefe
3 changed files with 69 additions and 5 deletions
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12
tcc.h
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@ -375,7 +375,8 @@ struct Attribute {
func_proto : 1,
mode : 4,
weak : 1,
fill : 10; // 10 bits left to fit well in union below
visibility : 2,
fill : 8; // 8 bits left to fit well in union below
};
/* GNUC attribute definition */
@ -787,11 +788,18 @@ struct TCCState {
#define VT_EXPORT 0x00008000 /* win32: data exported from dll */
#define VT_WEAK 0x00010000 /* weak symbol */
#define VT_TLS 0x00040000 /* thread-local storage */
#define VT_VIS_SHIFT 19 /* shift for symbol visibility, overlapping
bitfield values, because bitfields never
have linkage and hence never have
visibility. */
#define VT_VIS_SIZE 2 /* We have four visibilities. */
#define VT_VIS_MASK (((1 << VT_VIS_SIZE)-1) << VT_VIS_SHIFT)
#define VT_STRUCT_SHIFT 19 /* shift for bitfield shift values (max: 32 - 2*6) */
/* type mask (except storage) */
#define VT_STORAGE (VT_EXTERN | VT_STATIC | VT_TYPEDEF | VT_INLINE | VT_IMPORT | VT_EXPORT | VT_WEAK)
#define VT_STORAGE (VT_EXTERN | VT_STATIC | VT_TYPEDEF | VT_INLINE | VT_IMPORT | VT_EXPORT | VT_WEAK | VT_VIS_MASK)
#define VT_TYPE (~(VT_STORAGE))
/* token values */