Mercurial > hg > graal-compiler
diff src/share/vm/runtime/sharedRuntime.hpp @ 14416:6a936747b569
8024344: PPC64 (part 112): C argument in register AND stack slot.
Summary: 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
| author | goetz |
|---|---|
| date | Thu, 12 Sep 2013 13:51:13 -0700 |
| parents | b5c8a61d7fa0 |
| children | cfd05ec74089 |
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--- a/src/share/vm/runtime/sharedRuntime.hpp Fri Sep 06 20:16:09 2013 +0200 +++ b/src/share/vm/runtime/sharedRuntime.hpp Thu Sep 12 13:51:13 2013 -0700 @@ -356,7 +356,15 @@ 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