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Add machine-dependent 'float' type.

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This commit is contained in:
Graydon Hoare 2010-07-01 09:35:48 -07:00
parent afc0dc8bfc
commit cb04275afa
3 changed files with 21 additions and 4 deletions
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22
doc/rust.texi
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@ -647,9 +647,10 @@ The keywords are:
@tab @code{type} @tab @code{type}
@tab @code{true} @tab @code{true}
@tab @code{false} @tab @code{false}
@item @code{any} @tab @code{any}
@tab @code{int} @item @code{int}
@tab @code{uint} @tab @code{uint}
@tab @code{float}
@tab @code{char} @tab @code{char}
@tab @code{bool} @tab @code{bool}
@item @code{u8} @item @code{u8}
@ -1750,6 +1751,7 @@ Rust; they cannot be used as user-defined identifiers in any context.
* Ref.Type.Any:: An open sum of every possible type. * Ref.Type.Any:: An open sum of every possible type.
* Ref.Type.Mach:: Machine-level types. * Ref.Type.Mach:: Machine-level types.
* Ref.Type.Int:: The machine-dependent integer types. * Ref.Type.Int:: The machine-dependent integer types.
* Ref.Type.Float:: The machine-dependent floating-point types.
* Ref.Type.Prim:: Primitive types. * Ref.Type.Prim:: Primitive types.
* Ref.Type.Big:: The arbitrary-precision integer type. * Ref.Type.Big:: The arbitrary-precision integer type.
* Ref.Type.Text:: Strings and characters. * Ref.Type.Text:: Strings and characters.
@ -1842,9 +1844,21 @@ The Rust type @code{int}@footnote{A Rust @code{int} is analogous to a C99
target-machine-dependent size. Its size, in bits, is equal to the size of the target-machine-dependent size. Its size, in bits, is equal to the size of the
rust type @code{uint} on the same target machine. rust type @code{uint} on the same target machine.
@node Ref.Type.Float
@subsection Ref.Type.Float
The Rust type @code{float} is a machine-specific type equal to one of the
supported Rust floating-point machine types (@code{f32} or @code{f64}). It is
the largest floating-point type that is directly supported by hardware on the
target machine, or if the target machine has no floating-point hardware
support, the largest floating-point type supported by the software
floating-point library used to support the other floating-point machine types.
Note that due to the preference for hardware-supported floating point, the
type @code{float} may not be equal to the largest @emph{supported}
floating-point type.
@page
@node Ref.Type.Prim @node Ref.Type.Prim
@subsection Ref.Type.Prim @subsection Ref.Type.Prim
@ -1863,7 +1877,7 @@ The boolean type @code{bool} with values @code{true} and @code{false}.
@item @item
The machine types. The machine types.
@item @item
The machine-dependent integer types. The machine-dependent integer and floating-point types.
@end itemize @end itemize

1
src/boot/fe/lexer.mll
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@ -79,6 +79,7 @@
("int", INT); ("int", INT);
("uint", UINT); ("uint", UINT);
("float", FLOAT);
("char", CHAR); ("char", CHAR);
("str", STR); ("str", STR);

2
src/boot/fe/token.ml
View File

@ -118,6 +118,7 @@ type token =
| BOOL | BOOL
| INT | INT
| UINT | UINT
| FLOAT
| CHAR | CHAR
| STR | STR
| MACH of Common.ty_mach | MACH of Common.ty_mach
@ -267,6 +268,7 @@ let rec string_of_tok t =
| BOOL -> "bool" | BOOL -> "bool"
| INT -> "int" | INT -> "int"
| UINT -> "uint" | UINT -> "uint"
| FLOAT -> "float"
| CHAR -> "char" | CHAR -> "char"
| STR -> "str" | STR -> "str"
| MACH m -> Common.string_of_ty_mach m | MACH m -> Common.string_of_ty_mach m