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| //===- llvm/CallingConv.h - LLVM Calling Conventions ------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file defines LLVM's set of calling conventions.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_IR_CALLINGCONV_H
#define LLVM_IR_CALLINGCONV_H
namespace llvm {
/// CallingConv Namespace - This namespace contains an enum with a value for
/// the well-known calling conventions.
///
namespace CallingConv {
/// LLVM IR allows to use arbitrary numbers as calling convention identifiers.
using ID = unsigned;
/// A set of enums which specify the assigned numeric values for known llvm
/// calling conventions.
/// LLVM Calling Convention Representation
enum {
/// C - The default llvm calling convention, compatible with C. This
/// convention is the only calling convention that supports varargs calls.
/// As with typical C calling conventions, the callee/caller have to
/// tolerate certain amounts of prototype mismatch.
C = 0,
// Generic LLVM calling conventions. None of these calling conventions
// support varargs calls, and all assume that the caller and callee
// prototype exactly match.
/// Fast - This calling convention attempts to make calls as fast as
/// possible (e.g. by passing things in registers).
Fast = 8,
// Cold - This calling convention attempts to make code in the caller as
// efficient as possible under the assumption that the call is not commonly
// executed. As such, these calls often preserve all registers so that the
// call does not break any live ranges in the caller side.
Cold = 9,
// GHC - Calling convention used by the Glasgow Haskell Compiler (GHC).
GHC = 10,
// HiPE - Calling convention used by the High-Performance Erlang Compiler
// (HiPE).
HiPE = 11,
// WebKit JS - Calling convention for stack based JavaScript calls
WebKit_JS = 12,
// AnyReg - Calling convention for dynamic register based calls (e.g.
// stackmap and patchpoint intrinsics).
AnyReg = 13,
// PreserveMost - Calling convention for runtime calls that preserves most
// registers.
PreserveMost = 14,
// PreserveAll - Calling convention for runtime calls that preserves
// (almost) all registers.
PreserveAll = 15,
// Swift - Calling convention for Swift.
Swift = 16,
// CXX_FAST_TLS - Calling convention for access functions.
CXX_FAST_TLS = 17,
/// Tail - This calling convention attemps to make calls as fast as
/// possible while guaranteeing that tail call optimization can always
/// be performed.
Tail = 18,
/// Special calling convention on Windows for calling the Control
/// Guard Check ICall funtion. The function takes exactly one argument
/// (address of the target function) passed in the first argument register,
/// and has no return value. All register values are preserved.
CFGuard_Check = 19,
// Target - This is the start of the target-specific calling conventions,
// e.g. fastcall and thiscall on X86.
FirstTargetCC = 64,
/// X86_StdCall - stdcall is the calling conventions mostly used by the
/// Win32 API. It is basically the same as the C convention with the
/// difference in that the callee is responsible for popping the arguments
/// from the stack.
X86_StdCall = 64,
/// X86_FastCall - 'fast' analog of X86_StdCall. Passes first two arguments
/// in ECX:EDX registers, others - via stack. Callee is responsible for
/// stack cleaning.
X86_FastCall = 65,
/// ARM_APCS - ARM Procedure Calling Standard calling convention (obsolete,
/// but still used on some targets).
ARM_APCS = 66,
/// ARM_AAPCS - ARM Architecture Procedure Calling Standard calling
/// convention (aka EABI). Soft float variant.
ARM_AAPCS = 67,
/// ARM_AAPCS_VFP - Same as ARM_AAPCS, but uses hard floating point ABI.
ARM_AAPCS_VFP = 68,
/// MSP430_INTR - Calling convention used for MSP430 interrupt routines.
MSP430_INTR = 69,
/// X86_ThisCall - Similar to X86_StdCall. Passes first argument in ECX,
/// others via stack. Callee is responsible for stack cleaning. MSVC uses
/// this by default for methods in its ABI.
X86_ThisCall = 70,
/// PTX_Kernel - Call to a PTX kernel.
/// Passes all arguments in parameter space.
PTX_Kernel = 71,
/// PTX_Device - Call to a PTX device function.
/// Passes all arguments in register or parameter space.
PTX_Device = 72,
/// SPIR_FUNC - Calling convention for SPIR non-kernel device functions.
/// No lowering or expansion of arguments.
/// Structures are passed as a pointer to a struct with the byval attribute.
/// Functions can only call SPIR_FUNC and SPIR_KERNEL functions.
/// Functions can only have zero or one return values.
/// Variable arguments are not allowed, except for printf.
/// How arguments/return values are lowered are not specified.
/// Functions are only visible to the devices.
SPIR_FUNC = 75,
/// SPIR_KERNEL - Calling convention for SPIR kernel functions.
/// Inherits the restrictions of SPIR_FUNC, except
/// Cannot have non-void return values.
/// Cannot have variable arguments.
/// Can also be called by the host.
/// Is externally visible.
SPIR_KERNEL = 76,
/// Intel_OCL_BI - Calling conventions for Intel OpenCL built-ins
Intel_OCL_BI = 77,
/// The C convention as specified in the x86-64 supplement to the
/// System V ABI, used on most non-Windows systems.
X86_64_SysV = 78,
/// The C convention as implemented on Windows/x86-64 and
/// AArch64. This convention differs from the more common
/// \c X86_64_SysV convention in a number of ways, most notably in
/// that XMM registers used to pass arguments are shadowed by GPRs,
/// and vice versa.
/// On AArch64, this is identical to the normal C (AAPCS) calling
/// convention for normal functions, but floats are passed in integer
/// registers to variadic functions.
Win64 = 79,
/// MSVC calling convention that passes vectors and vector aggregates
/// in SSE registers.
X86_VectorCall = 80,
/// Calling convention used by HipHop Virtual Machine (HHVM) to
/// perform calls to and from translation cache, and for calling PHP
/// functions.
/// HHVM calling convention supports tail/sibling call elimination.
HHVM = 81,
/// HHVM calling convention for invoking C/C++ helpers.
HHVM_C = 82,
/// X86_INTR - x86 hardware interrupt context. Callee may take one or two
/// parameters, where the 1st represents a pointer to hardware context frame
/// and the 2nd represents hardware error code, the presence of the later
/// depends on the interrupt vector taken. Valid for both 32- and 64-bit
/// subtargets.
X86_INTR = 83,
/// Used for AVR interrupt routines.
AVR_INTR = 84,
/// Calling convention used for AVR signal routines.
AVR_SIGNAL = 85,
/// Calling convention used for special AVR rtlib functions
/// which have an "optimized" convention to preserve registers.
AVR_BUILTIN = 86,
/// Calling convention used for Mesa vertex shaders, or AMDPAL last shader
/// stage before rasterization (vertex shader if tessellation and geometry
/// are not in use, or otherwise copy shader if one is needed).
AMDGPU_VS = 87,
/// Calling convention used for Mesa/AMDPAL geometry shaders.
AMDGPU_GS = 88,
/// Calling convention used for Mesa/AMDPAL pixel shaders.
AMDGPU_PS = 89,
/// Calling convention used for Mesa/AMDPAL compute shaders.
AMDGPU_CS = 90,
/// Calling convention for AMDGPU code object kernels.
AMDGPU_KERNEL = 91,
/// Register calling convention used for parameters transfer optimization
X86_RegCall = 92,
/// Calling convention used for Mesa/AMDPAL hull shaders (= tessellation
/// control shaders).
AMDGPU_HS = 93,
/// Calling convention used for special MSP430 rtlib functions
/// which have an "optimized" convention using additional registers.
MSP430_BUILTIN = 94,
/// Calling convention used for AMDPAL vertex shader if tessellation is in
/// use.
AMDGPU_LS = 95,
/// Calling convention used for AMDPAL shader stage before geometry shader
/// if geometry is in use. So either the domain (= tessellation evaluation)
/// shader if tessellation is in use, or otherwise the vertex shader.
AMDGPU_ES = 96,
// Calling convention between AArch64 Advanced SIMD functions
AArch64_VectorCall = 97,
/// Calling convention between AArch64 SVE functions
AArch64_SVE_VectorCall = 98,
/// Calling convention for emscripten __invoke_* functions. The first
/// argument is required to be the function ptr being indirectly called.
/// The remainder matches the regular calling convention.
WASM_EmscriptenInvoke = 99,
/// The highest possible calling convention ID. Must be some 2^k - 1.
MaxID = 1023
};
} // end namespace CallingConv
} // end namespace llvm
#endif // LLVM_IR_CALLINGCONV_H
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