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8024344: PPC64 (part 112): C argument in register AND stack slot

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On PPC, the first 13 floating point arguments to C calls are passed in floating point registers. Also, all but the first 8 arguments are passed on the stack. So there can be floating point arguments that are passed on the stack and in a register. We duplicate the regs datastructure in c_calling_convention() to represent this.

Reviewed-by: kvn, cjplummer
This commit is contained in:
Goetz Lindenmaier 2013-09-12 13:51:13 -07:00
parent 2af861eed1
commit 081d2454fb
11 changed files with 28 additions and 13 deletions
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10
hotspot/src/share/vm/runtime/sharedRuntime.hpp
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@ -356,7 +356,15 @@ class SharedRuntime: AllStatic {
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);
//
// C argument in register AND stack slot.
// Some architectures require that an argument must be passed in a register
// AND in a stack slot. These architectures provide a second VMRegPair array
// to be filled by the c_calling_convention method. On other architectures,
// NULL is being passed as the second VMRegPair array, so arguments are either
// passed in a register OR in a stack slot.
static int c_calling_convention(const BasicType *sig_bt, VMRegPair *regs, VMRegPair *regs2,
int total_args_passed);
// Generate I2C and C2I adapters. These adapters are simple argument marshalling
// blobs. Unlike adapters in the tiger and earlier releases the code in these