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Language Specifics
TABLE 1-15:
Option
CODE GENERATION CONVENTION OPTIONS (CONTINUED)
Definition
-finstrument-
functions
-fno-ident
-fpack-struct
-fpcc-struct-
return
-fno-short-double
-fshort-enums
-fverbose-asm
-fno-verbose-asm
-fvolatile
-fvolatile-global
-fvolatile-static
? 2007 Microchip Technology Inc.
Generate instrumentation calls for entry and exit to functions. Just
after function entry and just before function exit, the following
profiling functions are called with the address of the current
function and its call site.
void __ cyg_profile_func_enter
(void *this_fn, void *call_site);
void __ cyg_profile_func_exit
(void *this_fn, void *call_site);
The first argument is the address of the start of the current
function, which may be looked up exactly in the symbol table.
The profiling functions should be provided by the user.
Function instrumentation requires the use of a Frame Pointer.
Some optimization levels disable the use of the Frame Pointer.
Using -fno-omit-frame-pointer prevents this.
This instrumentation is also done for functions expanded inline in
other functions. The profiling calls indicates where, conceptually,
the inline function is entered and exited. This means that
addressable versions of such functions must be available. If all
your uses of a function are expanded inline, this may mean an
additional expansion of code size. If you use extern inline in
your C code, an addressable version of such functions must be
provided.
A function may be given the attribute
no_instrument_function , in which case this instrumentation
is not done.
Ignore the #ident directive.
Pack all structure members together without holes. Usually you
would not want to use this option, since it makes the code
sub-optimal, and the offsets of structure members won’t agree with
system libraries.
Return short struct and union values in memory like longer
ones, rather than in registers. This convention is less efficient, but
it has the advantage of allowing capability between MPLAB C32
compiled files and files compiled with other compilers.
Short structures and unions are those whose size and alignment
match that of an integer type.
By default, the compiler uses a double type equivalent to float .
This option makes double equivalent to long double . Mixing
this option across modules can have unexpected results if
modules share double data either directly through argument
passage or indirectly through shared buffer space. Libraries
provided with the product function with either switch setting.
Allocate to an enum type only as many bytes as it needs for the
declared range of possible values. Specifically, the enum type is
equivalent to the smallest integer type which has enough room.
Put extra commentary information in the generated assembly code
to make it more readable.
-fno-verbose-asm , the default, causes the extra information to
be omitted and is useful when comparing two assembler files.
Consider all memory references through pointers to be volatile.
Consider all memory references to external and global data items
to be volatile. The use of this switch has no effect on static data.
Consider all memory references to static data to be volatile.
DS51686A-page 39
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相关PDF资料
SW300003-EVAL
LIBRARY SOFT MODEM-EVAL ONLY
SW300010-EVAL
SPEECH RECOG LIBRARY-EVAL ONLY
SW300040-EVAL
LIBRARY NOISE SUPPR-EVAL ONLY
SW300060-EVAL
LIBRARY ACOUSTIC ECHO-EVAL ONLY
SW300070-EVAL
SOFTWARE LIBR ENC/DEC EVAL ONLY
SW500012
HI-TECH C PRO FOR PIC32
SY87701LHI-EVAL
BOARD EVAL SY87701 EXPERIMENT
SY87729LHI-EVAL
BOARD EVAL N SY87729 EXPERIMENT
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