1 //===-- llvm/CallingConv.h - LLVM Calling Conventions -----------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines LLVM's set of calling conventions.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_IR_CALLINGCONV_H
15 #define LLVM_IR_CALLINGCONV_H
19 /// CallingConv Namespace - This namespace contains an enum with a value for
20 /// the well-known calling conventions.
22 namespace CallingConv {
23 /// A set of enums which specify the assigned numeric values for known llvm
24 /// calling conventions.
25 /// @brief LLVM Calling Convention Representation
27 /// C - The default llvm calling convention, compatible with C. This
28 /// convention is the only calling convention that supports varargs calls.
29 /// As with typical C calling conventions, the callee/caller have to
30 /// tolerate certain amounts of prototype mismatch.
33 // Generic LLVM calling conventions. None of these calling conventions
34 // support varargs calls, and all assume that the caller and callee
35 // prototype exactly match.
37 /// Fast - This calling convention attempts to make calls as fast as
38 /// possible (e.g. by passing things in registers).
41 // Cold - This calling convention attempts to make code in the caller as
42 // efficient as possible under the assumption that the call is not commonly
43 // executed. As such, these calls often preserve all registers so that the
44 // call does not break any live ranges in the caller side.
47 // GHC - Calling convention used by the Glasgow Haskell Compiler (GHC).
50 // HiPE - Calling convention used by the High-Performance Erlang Compiler
54 // WebKit JS - Calling convention for stack based JavaScript calls
57 // AnyReg - Calling convention for dynamic register based calls (e.g.
58 // stackmap and patchpoint intrinsics).
61 // PreserveMost - Calling convention for runtime calls that preserves most
65 // PreserveAll - Calling convention for runtime calls that preserves
66 // (almost) all registers.
69 // Target - This is the start of the target-specific calling conventions,
70 // e.g. fastcall and thiscall on X86.
73 /// X86_StdCall - stdcall is the calling conventions mostly used by the
74 /// Win32 API. It is basically the same as the C convention with the
75 /// difference in that the callee is responsible for popping the arguments
79 /// X86_FastCall - 'fast' analog of X86_StdCall. Passes first two arguments
80 /// in ECX:EDX registers, others - via stack. Callee is responsible for
84 /// ARM_APCS - ARM Procedure Calling Standard calling convention (obsolete,
85 /// but still used on some targets).
88 /// ARM_AAPCS - ARM Architecture Procedure Calling Standard calling
89 /// convention (aka EABI). Soft float variant.
92 /// ARM_AAPCS_VFP - Same as ARM_AAPCS, but uses hard floating point ABI.
95 /// MSP430_INTR - Calling convention used for MSP430 interrupt routines.
98 /// X86_ThisCall - Similar to X86_StdCall. Passes first argument in ECX,
99 /// others via stack. Callee is responsible for stack cleaning. MSVC uses
100 /// this by default for methods in its ABI.
103 /// PTX_Kernel - Call to a PTX kernel.
104 /// Passes all arguments in parameter space.
107 /// PTX_Device - Call to a PTX device function.
108 /// Passes all arguments in register or parameter space.
111 /// SPIR_FUNC - Calling convention for SPIR non-kernel device functions.
112 /// No lowering or expansion of arguments.
113 /// Structures are passed as a pointer to a struct with the byval attribute.
114 /// Functions can only call SPIR_FUNC and SPIR_KERNEL functions.
115 /// Functions can only have zero or one return values.
116 /// Variable arguments are not allowed, except for printf.
117 /// How arguments/return values are lowered are not specified.
118 /// Functions are only visible to the devices.
121 /// SPIR_KERNEL - Calling convention for SPIR kernel functions.
122 /// Inherits the restrictions of SPIR_FUNC, except
123 /// Cannot have non-void return values.
124 /// Cannot have variable arguments.
125 /// Can also be called by the host.
126 /// Is externally visible.
129 /// Intel_OCL_BI - Calling conventions for Intel OpenCL built-ins
132 /// \brief The C convention as specified in the x86-64 supplement to the
133 /// System V ABI, used on most non-Windows systems.
136 /// \brief The C convention as implemented on Windows/x86-64. This
137 /// convention differs from the more common \c X86_64_SysV convention
138 /// in a number of ways, most notably in that XMM registers used to pass
139 /// arguments are shadowed by GPRs, and vice versa.
142 } // End CallingConv namespace
144 } // End llvm namespace