archive/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2025-09-20 11:04:34 +02:00
Code Issues Projects Releases Packages Wiki Activity Actions

7173584: Implement arraycopy as a macro node

Browse source 
Delay the conversion of arraycopy to stub calls to macro expansion

Reviewed-by: kvn, iveresov
This commit is contained in:
Roland Westrelin 2014-08-11 14:12:51 +02:00
parent 29ec2196ef
commit a56ade07c7
15 changed files with 1790 additions and 1082 deletions
Download patch file Download diff file Expand all files Collapse all files

50
hotspot/src/share/vm/opto/compile.cpp
View file

@ -3787,6 +3787,56 @@ void Compile::ConstantTable::fill_jump_table(CodeBuffer& cb, MachConstantNode* n
}
}
//----------------------------static_subtype_check-----------------------------
// Shortcut important common cases when superklass is exact:
// (0) superklass is java.lang.Object (can occur in reflective code)
// (1) subklass is already limited to a subtype of superklass => always ok
// (2) subklass does not overlap with superklass => always fail
// (3) superklass has NO subtypes and we can check with a simple compare.
int Compile::static_subtype_check(ciKlass* superk, ciKlass* subk) {
if (StressReflectiveCode) {
return SSC_full_test; // Let caller generate the general case.
}
if (superk == env()->Object_klass()) {
return SSC_always_true; // (0) this test cannot fail
}
ciType* superelem = superk;
if (superelem->is_array_klass())
superelem = superelem->as_array_klass()->base_element_type();
if (!subk->is_interface()) { // cannot trust static interface types yet
if (subk->is_subtype_of(superk)) {
return SSC_always_true; // (1) false path dead; no dynamic test needed
}
if (!(superelem->is_klass() && superelem->as_klass()->is_interface()) &&
!superk->is_subtype_of(subk)) {
return SSC_always_false;
}
}
// If casting to an instance klass, it must have no subtypes
if (superk->is_interface()) {
// Cannot trust interfaces yet.
// %%% S.B. superk->nof_implementors() == 1
} else if (superelem->is_instance_klass()) {
ciInstanceKlass* ik = superelem->as_instance_klass();
if (!ik->has_subklass() && !ik->is_interface()) {
if (!ik->is_final()) {
// Add a dependency if there is a chance of a later subclass.
dependencies()->assert_leaf_type(ik);
}
return SSC_easy_test; // (3) caller can do a simple ptr comparison
}
} else {
// A primitive array type has no subtypes.
return SSC_easy_test; // (3) caller can do a simple ptr comparison
}
return SSC_full_test;
}
// The message about the current inlining is accumulated in
// _print_inlining_stream and transfered into the _print_inlining_list
// once we know whether inlining succeeds or not. For regular