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HHVM calling convention, hhvmcc, is used by HHVM JIT for functions in translated cache. We currently support LLVM back end to generate code for X86-64 and may support other architectures in the future. In HHVM calling convention any GP register could be used to pass and return values, with the exception of R12 which is reserved for thread-local area and is callee-saved. Other than R12, we always pass RBX and RBP as args, which are our virtual machine's stack pointer and frame pointer respectively. When we enter translation cache via hhvmcc function, we expect the stack to be aligned at 16 bytes, i.e. skewed by 8 bytes as opposed to standard ABI alignment. This affects stack object alignment and stack adjustments for function calls. One extra calling convention, hhvm_ccc, is used to call C++ helpers from HHVM's translation cache. It is almost identical to standard C calling convention with an exception of first argument which is passed in RBP (before we use RDI, RSI, etc.) Differential Revision: http://reviews.llvm.org/D12681 llvm-svn: 248832
70 lines
1.2 KiB
LLVM
70 lines
1.2 KiB
LLVM
; RUN: llvm-as < %s | llvm-dis > %t1.ll
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; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
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; RUN: diff %t1.ll %t2.ll
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define fastcc void @foo() {
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ret void
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}
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define coldcc void @bar() {
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call fastcc void @foo( )
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ret void
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}
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define void @structret({ i8 }* sret %P) {
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call void @structret( { i8 }* sret %P )
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ret void
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}
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define void @foo2() {
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ret void
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}
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define coldcc void @bar2() {
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call fastcc void @foo( )
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ret void
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}
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define cc42 void @bar3() personality i32 (...)* @__gxx_personality_v0 {
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invoke fastcc void @foo( )
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to label %Ok unwind label %U
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Ok:
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ret void
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U:
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%exn = landingpad {i8*, i32}
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cleanup
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resume { i8*, i32 } %exn
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}
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define void @bar4() personality i32 (...)* @__gxx_personality_v0 {
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call cc42 void @bar( )
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invoke cc42 void @bar3( )
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to label %Ok unwind label %U
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Ok:
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ret void
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U:
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%exn = landingpad {i8*, i32}
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cleanup
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resume { i8*, i32 } %exn
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}
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declare ghccc void @ghc_callee()
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define void @ghc_caller() {
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call ghccc void @ghc_callee()
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ret void
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}
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declare hhvm_ccc void @hhvm_c_callee()
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define hhvmcc void @hhvm_caller() {
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call hhvm_ccc void @hhvm_c_callee()
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ret void
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}
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declare i32 @__gxx_personality_v0(...)
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