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Diffstat (limited to 'gcc/target.def')
| -rw-r--r-- | gcc/target.def | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/gcc/target.def b/gcc/target.def index b6968f7..29d1f81 100644 --- a/gcc/target.def +++ b/gcc/target.def @@ -4796,6 +4796,25 @@ be returned; otherwise @var{addr} should be returned unchanged.\n\ If this hook is not defined, @var{addr} will be used for function calls.", rtx, (rtx addr), NULL) +DEFHOOKPOD +(custom_function_descriptors, + "This hook should be defined to a power of 2 if the target will benefit\n\ +from the use of custom descriptors for nested functions instead of the\n\ +standard trampolines. Such descriptors are created at run time on the\n\ +stack and made up of data only, but they are non-standard so the generated\n\ +code must be prepared to deal with them. This hook should be defined to 0\n\ +if the target uses function descriptors for its standard calling sequence,\n\ +like for example HP-PA or IA-64. Using descriptors for nested functions\n\ +eliminates the need for trampolines that reside on the stack and require\n\ +it to be made executable.\n\ +\n\ +The value of the macro is used to parameterize the run-time identification\n\ +scheme implemented to distinguish descriptors from function addresses: it\n\ +gives the number of bytes by which their address is misaligned compared\n\ +with function addresses. The value of 1 will generally work, unless it is\n\ +already reserved by the target for another purpose, like for example on ARM.",\ + int, -1) + /* Return the number of bytes of its own arguments that a function pops on returning, or 0 if the function pops no arguments and the caller must therefore pop them all after the function returns. */ |