llvm/test/Feature/callingconventions.ll
Maksim Panchenko 3b3752c898 HHVM calling conventions.
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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@248832 91177308-0d34-0410-b5e6-96231b3b80d8
2015-09-29 22:09:16 +00:00

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LLVM

; RUN: llvm-as < %s | llvm-dis > %t1.ll
; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
; RUN: diff %t1.ll %t2.ll
define fastcc void @foo() {
ret void
}
define coldcc void @bar() {
call fastcc void @foo( )
ret void
}
define void @structret({ i8 }* sret %P) {
call void @structret( { i8 }* sret %P )
ret void
}
define void @foo2() {
ret void
}
define coldcc void @bar2() {
call fastcc void @foo( )
ret void
}
define cc42 void @bar3() personality i32 (...)* @__gxx_personality_v0 {
invoke fastcc void @foo( )
to label %Ok unwind label %U
Ok:
ret void
U:
%exn = landingpad {i8*, i32}
cleanup
resume { i8*, i32 } %exn
}
define void @bar4() personality i32 (...)* @__gxx_personality_v0 {
call cc42 void @bar( )
invoke cc42 void @bar3( )
to label %Ok unwind label %U
Ok:
ret void
U:
%exn = landingpad {i8*, i32}
cleanup
resume { i8*, i32 } %exn
}
declare ghccc void @ghc_callee()
define void @ghc_caller() {
call ghccc void @ghc_callee()
ret void
}
declare hhvm_ccc void @hhvm_c_callee()
define hhvmcc void @hhvm_caller() {
call hhvm_ccc void @hhvm_c_callee()
ret void
}
declare i32 @__gxx_personality_v0(...)