src/share/vm/runtime/sharedRuntime.hpp
Print this page
rev 5186 : 8024342: PPC64 (part 111): Support for C calling conventions that require 64-bit ints.
Summary: Some platforms, as ppc and s390x/zArch require that 32-bit ints are passed as 64-bit values to C functions. This change adds support to adapt the signature and to issue proper casts to c2-compiled stubs. The functions are used in generate_native_wrapper(). Adapt signature in PhaseIdealLoop::intrinsify_fill().
*** 356,365 ****
--- 356,377 ----
const VMRegPair* regs) NOT_DEBUG_RETURN;
// Ditto except for calling C
static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed);
+ // Querry whether this platforms requires that 32 bit integers are
+ // passed as 64 bit wide entities in C calls. (This is the case on PPC
+ // and z/Arch.)
+ static bool c_calling_convention_requires_ints_as_longs();
+ // Compute the new number of arguments in the signature if 32 bit ints
+ // must be converted to longs.
+ static int convert_ints_to_longints_argcnt(int in_args_count, BasicType* in_sig_bt);
+ // Adapt a method's signature if it contains 32 bit integers that must
+ // be converted to longs.
+ static void convert_ints_to_longints(int i2l_argcnt, int& in_args_count,
+ BasicType*& in_sig_bt, VMRegPair*& in_regs );
+
// Generate I2C and C2I adapters. These adapters are simple argument marshalling
// blobs. Unlike adapters in the tiger and earlier releases the code in these
// blobs does not create a new frame and are therefore virtually invisible
// to the stack walking code. In general these blobs extend the callers stack
// as needed for the conversion of argument locations.
*** 368,378 ****
// by the time we reach the blob there is compiled code available. This allows
// the blob to pass the incoming stack pointer (the sender sp) in a known
// location for the interpreter to record. This is used by the frame code
// to correct the sender code to match up with the stack pointer when the
// thread left the compiled code. In addition it allows the interpreter
! // to remove the space the c2i adapter allocated to do it argument conversion.
// Although a c2i blob will always run interpreted even if compiled code is
// present if we see that compiled code is present the compiled call site
// will be patched/re-resolved so that later calls will run compiled.
--- 380,390 ----
// by the time we reach the blob there is compiled code available. This allows
// the blob to pass the incoming stack pointer (the sender sp) in a known
// location for the interpreter to record. This is used by the frame code
// to correct the sender code to match up with the stack pointer when the
// thread left the compiled code. In addition it allows the interpreter
! // to remove the space the c2i adapter allocated to do its argument conversion.
// Although a c2i blob will always run interpreted even if compiled code is
// present if we see that compiled code is present the compiled call site
// will be patched/re-resolved so that later calls will run compiled.