diff options
Diffstat (limited to 'gcc-4.8/libffi/doc/libffi.info')
| -rw-r--r-- | gcc-4.8/libffi/doc/libffi.info | 68 |
1 files changed, 35 insertions, 33 deletions
diff --git a/gcc-4.8/libffi/doc/libffi.info b/gcc-4.8/libffi/doc/libffi.info index 110e94574..5fe3d5aff 100644 --- a/gcc-4.8/libffi/doc/libffi.info +++ b/gcc-4.8/libffi/doc/libffi.info @@ -1,5 +1,5 @@ -This is doc/libffi.info, produced by makeinfo version 4.13 from -/d/gcc-4.8.1/gcc-4.8.1/libffi/doc/libffi.texi. +This is doc/libffi.info, produced by makeinfo version 4.12 from +/space/rguenther/gcc-4.8.3/gcc-4.8.3/libffi/doc/libffi.texi. This manual is for Libffi, a portable foreign-function interface library. @@ -56,7 +56,7 @@ The calling convention is a set of assumptions made by the compiler about where function arguments will be found on entry to a function. A calling convention also specifies where the return value for a function is found. The calling convention is also sometimes called the "ABI" or -"Application Binary Interface". +"Application Binary Interface". Some programs may not know at the time of compilation what arguments are to be passed to a function. For instance, an interpreter may be @@ -161,10 +161,10 @@ To prepare a call interface object, use the function `ffi_prep_cif'. RVALUE is a pointer to a chunk of memory that will hold the result of the function call. This must be large enough to hold the - result and must be suitably aligned; it is the caller's + result, no smaller than the system register size (generally 32 or + 64 bits), and must be suitably aligned; it is the caller's responsibility to ensure this. If CIF declares that the function returns `void' (using `ffi_type_void'), then RVALUE is ignored. - If RVALUE is `NULL', then the return value is discarded. AVALUES is a vector of `void *' pointers that point to the memory locations holding the argument values for a call. If CIF declares @@ -190,7 +190,7 @@ Here is a trivial example that calls `puts' a few times. ffi_type *args[1]; void *values[1]; char *s; - int rc; + ffi_arg rc; /* Initialize the argument info vectors */ args[0] = &ffi_type_pointer; @@ -198,7 +198,7 @@ Here is a trivial example that calls `puts' a few times. /* Initialize the cif */ if (ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1, - &ffi_type_uint, args) == FFI_OK) + &ffi_type_sint, args) == FFI_OK) { s = "Hello World!"; ffi_call(&cif, puts, &rc, values); @@ -318,7 +318,7 @@ is perfectly happy passing structures back and forth. You must first describe the structure to `libffi' by creating a new `ffi_type' object for it. - -- ffi_type: + -- Data type: ffi_type The `ffi_type' has the following members: `size_t size' This is set by `libffi'; you should initialize it to zero. @@ -367,6 +367,7 @@ The following example initializes a `ffi_type' object representing the int i; tm_type.size = tm_type.alignment = 0; + tm_type.type = FFI_TYPE_STRUCT; tm_type.elements = &tm_type_elements; for (i = 0; i < 9; i++) @@ -443,19 +444,19 @@ closure function: FUN is the function which will be called when the closure is invoked. It is called with the arguments: - CIF + CIF The `ffi_cif' passed to `ffi_prep_closure_loc'. - RET + RET A pointer to the memory used for the function's return value. FUN must fill this, unless the function is declared as returning `void'. - ARGS + ARGS A vector of pointers to memory holding the arguments to the function. - USER_DATA + USER_DATA The same USER_DATA that was passed to `ffi_prep_closure_loc'. `ffi_prep_closure_loc' will return `FFI_OK' if everything went ok, @@ -481,19 +482,21 @@ A trivial example that creates a new `puts' by binding `fputs' with #include <ffi.h> /* Acts like puts with the file given at time of enclosure. */ - void puts_binding(ffi_cif *cif, unsigned int *ret, void* args[], - FILE *stream) + void puts_binding(ffi_cif *cif, void *ret, void* args[], + void *stream) { - *ret = fputs(*(char **)args[0], stream); + *(ffi_arg *)ret = fputs(*(char **)args[0], (FILE *)stream); } + typedef int (*puts_t)(char *); + int main() { ffi_cif cif; ffi_type *args[1]; ffi_closure *closure; - int (*bound_puts)(char *); + void *bound_puts; int rc; /* Allocate closure and bound_puts */ @@ -506,13 +509,13 @@ A trivial example that creates a new `puts' by binding `fputs' with /* Initialize the cif */ if (ffi_prep_cif(&cif, FFI_DEFAULT_ABI, 1, - &ffi_type_uint, args) == FFI_OK) + &ffi_type_sint, args) == FFI_OK) { /* Initialize the closure, setting stream to stdout */ if (ffi_prep_closure_loc(closure, &cif, puts_binding, stdout, bound_puts) == FFI_OK) { - rc = bound_puts("Hello World!"); + rc = ((puts_t)bound_puts)("Hello World!"); /* rc now holds the result of the call to fputs */ } } @@ -553,7 +556,6 @@ Index * Menu: -* : Structures. (line 12) * ABI: Introduction. (line 13) * Application Binary Interface: Introduction. (line 13) * calling convention: Introduction. (line 13) @@ -599,19 +601,19 @@ Index Tag Table: -Node: Top722 -Node: Introduction1470 -Node: Using libffi3106 -Node: The Basics3592 -Node: Simple Example7234 -Node: Types8261 -Node: Primitive Types8544 -Node: Structures10364 -Node: Type Example11224 -Node: Multiple ABIs12447 -Node: The Closure API12818 -Node: Closure Example15762 -Node: Missing Features17321 -Node: Index17774 +Node: Top736 +Node: Introduction1484 +Node: Using libffi3120 +Node: The Basics3606 +Node: Simple Example7260 +Node: Types8291 +Node: Primitive Types8574 +Node: Structures10394 +Node: Type Example11264 +Node: Multiple ABIs12530 +Node: The Closure API12901 +Node: Closure Example15845 +Node: Missing Features17453 +Node: Index17906 End Tag Table |