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8024342: PPC64 (part 111): Support for C calling conventions that require 64-bit ints

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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 used by the compiler as in PhaseIdealLoop::intrinsify_fill().

Reviewed-by: kvn
This commit is contained in:
Goetz Lindenmaier 2013-09-18 14:34:56 -07:00
parent 28ae8cc785
commit 5d63d647c1
10 changed files with 157 additions and 26 deletions
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12
hotspot/src/share/vm/runtime/sharedRuntime.hpp
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@ -366,6 +366,16 @@ class SharedRuntime: AllStatic {
static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
int total_args_passed);
// Compute the new number of arguments in the signature if 32 bit ints
// must be converted to longs. Needed if CCallingConventionRequiresIntsAsLongs
// is true.
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. Needed if CCallingConventionRequiresIntsAsLongs
// is true.
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
@ -378,7 +388,7 @@ class SharedRuntime: AllStatic {
// 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.
// 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