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re-apply VLA by Thomas Preud'homme

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This commit is contained in:
Joe Soroka
2011-04-06 09:17:03 -07:00
parent 17571298f3
commit ace0f7f259
7 changed files with 173 additions and 35 deletions
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18
tcc-doc.texi
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@ -929,9 +929,13 @@ be the best solution.
#define VT_BTYPE 0x000f /* mask for basic type */
#define VT_UNSIGNED 0x0010 /* unsigned type */
#define VT_ARRAY 0x0020 /* array type (also has VT_PTR) */
#define VT_VLA 0x20000 /* VLA type (also has VT_PTR and VT_ARRAY) */
#define VT_BITFIELD 0x0040 /* bitfield modifier */
#define VT_CONSTANT 0x0800 /* const modifier */
#define VT_VOLATILE 0x1000 /* volatile modifier */
#define VT_SIGNED 0x2000 /* signed type */
#define VT_STRUCT_SHIFT 17 /* structure/enum name shift (14 bits left) */
#define VT_STRUCT_SHIFT 18 /* structure/enum name shift (14 bits left) */
@end example
When a reference to another type is needed (for pointers, functions and
@ -942,7 +946,8 @@ The @code{VT_UNSIGNED} flag can be set for chars, shorts, ints and long
longs.
Arrays are considered as pointers @code{VT_PTR} with the flag
@code{VT_ARRAY} set.
@code{VT_ARRAY} set. Variable length arrays are considered as special
arrays and therefore also have flag @code{VT_VLA} set.
The @code{VT_BITFIELD} flag can be set for chars, shorts, ints and long
longs. If it is set, then the bitfield position is stored from bits
@ -958,6 +963,10 @@ integer:
#define VT_EXTERN 0x00000080 /* extern definition */
#define VT_STATIC 0x00000100 /* static variable */
#define VT_TYPEDEF 0x00000200 /* typedef definition */
#define VT_INLINE 0x00000400 /* inline definition */
#define VT_IMPORT 0x00004000 /* win32: extern data imported from dll */
#define VT_EXPORT 0x00008000 /* win32: data exported from dll */
#define VT_WEAK 0x00010000 /* win32: data exported from dll */
@end example
@section Symbols
@ -969,7 +978,10 @@ contains @code{Sym} structures.
an idenfier is also a token, so a string is never necessary to store
it). @code{Sym.t} gives the type of the symbol. @code{Sym.r} is usually
the register in which the corresponding variable is stored. @code{Sym.c} is
usually a constant associated to the symbol.
usually a constant associated to the symbol like its address for normal
symbols, and the number of entries for symbols representing arrays.
Variable length arrays use @code{Sym.r} instead, which is a pointer to
a @code{SValue} holding its runtime size.
Four main symbol stacks are defined: