355 lines
16 KiB
C
355 lines
16 KiB
C
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//===---- TargetInfo.h - Encapsulate target details -------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// These classes wrap the information about a call or function
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// definition used to handle ABI compliancy.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CLANG_LIB_CODEGEN_TARGETINFO_H
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#define LLVM_CLANG_LIB_CODEGEN_TARGETINFO_H
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#include "CodeGenModule.h"
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#include "CGValue.h"
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#include "clang/AST/Type.h"
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#include "clang/Basic/LLVM.h"
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#include "clang/Basic/SyncScope.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringRef.h"
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namespace llvm {
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class Constant;
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class GlobalValue;
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class Type;
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class Value;
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}
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namespace clang {
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class Decl;
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namespace CodeGen {
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class ABIInfo;
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class CallArgList;
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class CodeGenFunction;
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class CGBlockInfo;
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class CGFunctionInfo;
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/// TargetCodeGenInfo - This class organizes various target-specific
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/// codegeneration issues, like target-specific attributes, builtins and so
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/// on.
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class TargetCodeGenInfo {
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std::unique_ptr<ABIInfo> Info = nullptr;
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public:
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TargetCodeGenInfo(std::unique_ptr<ABIInfo> Info) : Info(std::move(Info)) {}
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virtual ~TargetCodeGenInfo();
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/// getABIInfo() - Returns ABI info helper for the target.
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const ABIInfo &getABIInfo() const { return *Info; }
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/// setTargetAttributes - Provides a convenient hook to handle extra
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/// target-specific attributes for the given global.
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virtual void setTargetAttributes(const Decl *D, llvm::GlobalValue *GV,
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CodeGen::CodeGenModule &M) const {}
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/// emitTargetMetadata - Provides a convenient hook to handle extra
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/// target-specific metadata for the given globals.
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virtual void emitTargetMetadata(
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CodeGen::CodeGenModule &CGM,
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const llvm::MapVector<GlobalDecl, StringRef> &MangledDeclNames) const {}
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/// Any further codegen related checks that need to be done on a function call
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/// in a target specific manner.
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virtual void checkFunctionCallABI(CodeGenModule &CGM, SourceLocation CallLoc,
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const FunctionDecl *Caller,
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const FunctionDecl *Callee,
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const CallArgList &Args) const {}
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/// Determines the size of struct _Unwind_Exception on this platform,
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/// in 8-bit units. The Itanium ABI defines this as:
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/// struct _Unwind_Exception {
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/// uint64 exception_class;
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/// _Unwind_Exception_Cleanup_Fn exception_cleanup;
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/// uint64 private_1;
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/// uint64 private_2;
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/// };
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virtual unsigned getSizeOfUnwindException() const;
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/// Controls whether __builtin_extend_pointer should sign-extend
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/// pointers to uint64_t or zero-extend them (the default). Has
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/// no effect for targets:
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/// - that have 64-bit pointers, or
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/// - that cannot address through registers larger than pointers, or
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/// - that implicitly ignore/truncate the top bits when addressing
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/// through such registers.
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virtual bool extendPointerWithSExt() const { return false; }
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/// Determines the DWARF register number for the stack pointer, for
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/// exception-handling purposes. Implements __builtin_dwarf_sp_column.
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///
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/// Returns -1 if the operation is unsupported by this target.
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virtual int getDwarfEHStackPointer(CodeGen::CodeGenModule &M) const {
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return -1;
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}
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/// Initializes the given DWARF EH register-size table, a char*.
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/// Implements __builtin_init_dwarf_reg_size_table.
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///
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/// Returns true if the operation is unsupported by this target.
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virtual bool initDwarfEHRegSizeTable(CodeGen::CodeGenFunction &CGF,
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llvm::Value *Address) const {
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return true;
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}
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/// Performs the code-generation required to convert a return
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/// address as stored by the system into the actual address of the
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/// next instruction that will be executed.
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///
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/// Used by __builtin_extract_return_addr().
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virtual llvm::Value *decodeReturnAddress(CodeGen::CodeGenFunction &CGF,
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llvm::Value *Address) const {
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return Address;
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}
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/// Performs the code-generation required to convert the address
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/// of an instruction into a return address suitable for storage
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/// by the system in a return slot.
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///
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/// Used by __builtin_frob_return_addr().
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virtual llvm::Value *encodeReturnAddress(CodeGen::CodeGenFunction &CGF,
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llvm::Value *Address) const {
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return Address;
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}
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/// Corrects the low-level LLVM type for a given constraint and "usual"
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/// type.
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///
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/// \returns A pointer to a new LLVM type, possibly the same as the original
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/// on success; 0 on failure.
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virtual llvm::Type *adjustInlineAsmType(CodeGen::CodeGenFunction &CGF,
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StringRef Constraint,
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llvm::Type *Ty) const {
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return Ty;
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}
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/// Adds constraints and types for result registers.
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virtual void addReturnRegisterOutputs(
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CodeGen::CodeGenFunction &CGF, CodeGen::LValue ReturnValue,
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std::string &Constraints, std::vector<llvm::Type *> &ResultRegTypes,
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std::vector<llvm::Type *> &ResultTruncRegTypes,
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std::vector<CodeGen::LValue> &ResultRegDests, std::string &AsmString,
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unsigned NumOutputs) const {}
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/// doesReturnSlotInterfereWithArgs - Return true if the target uses an
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/// argument slot for an 'sret' type.
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virtual bool doesReturnSlotInterfereWithArgs() const { return true; }
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/// Retrieve the address of a function to call immediately before
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/// calling objc_retainAutoreleasedReturnValue. The
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/// implementation of objc_autoreleaseReturnValue sniffs the
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/// instruction stream following its return address to decide
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/// whether it's a call to objc_retainAutoreleasedReturnValue.
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/// This can be prohibitively expensive, depending on the
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/// relocation model, and so on some targets it instead sniffs for
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/// a particular instruction sequence. This functions returns
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/// that instruction sequence in inline assembly, which will be
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/// empty if none is required.
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virtual StringRef getARCRetainAutoreleasedReturnValueMarker() const {
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return "";
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}
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/// Determine whether a call to objc_retainAutoreleasedReturnValue or
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/// objc_unsafeClaimAutoreleasedReturnValue should be marked as 'notail'.
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virtual bool markARCOptimizedReturnCallsAsNoTail() const { return false; }
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/// Return a constant used by UBSan as a signature to identify functions
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/// possessing type information, or 0 if the platform is unsupported.
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virtual llvm::Constant *
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getUBSanFunctionSignature(CodeGen::CodeGenModule &CGM) const {
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return nullptr;
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}
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/// Determine whether a call to an unprototyped functions under
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/// the given calling convention should use the variadic
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/// convention or the non-variadic convention.
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///
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/// There's a good reason to make a platform's variadic calling
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/// convention be different from its non-variadic calling
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/// convention: the non-variadic arguments can be passed in
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/// registers (better for performance), and the variadic arguments
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/// can be passed on the stack (also better for performance). If
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/// this is done, however, unprototyped functions *must* use the
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/// non-variadic convention, because C99 states that a call
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/// through an unprototyped function type must succeed if the
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/// function was defined with a non-variadic prototype with
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/// compatible parameters. Therefore, splitting the conventions
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/// makes it impossible to call a variadic function through an
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/// unprototyped type. Since function prototypes came out in the
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/// late 1970s, this is probably an acceptable trade-off.
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/// Nonetheless, not all platforms are willing to make it, and in
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/// particularly x86-64 bends over backwards to make the
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/// conventions compatible.
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///
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/// The default is false. This is correct whenever:
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/// - the conventions are exactly the same, because it does not
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/// matter and the resulting IR will be somewhat prettier in
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/// certain cases; or
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/// - the conventions are substantively different in how they pass
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/// arguments, because in this case using the variadic convention
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/// will lead to C99 violations.
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///
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/// However, some platforms make the conventions identical except
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/// for passing additional out-of-band information to a variadic
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/// function: for example, x86-64 passes the number of SSE
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/// arguments in %al. On these platforms, it is desirable to
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/// call unprototyped functions using the variadic convention so
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/// that unprototyped calls to varargs functions still succeed.
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///
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/// Relatedly, platforms which pass the fixed arguments to this:
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/// A foo(B, C, D);
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/// differently than they would pass them to this:
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/// A foo(B, C, D, ...);
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/// may need to adjust the debugger-support code in Sema to do the
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/// right thing when calling a function with no know signature.
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virtual bool isNoProtoCallVariadic(const CodeGen::CallArgList &args,
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const FunctionNoProtoType *fnType) const;
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/// Gets the linker options necessary to link a dependent library on this
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/// platform.
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virtual void getDependentLibraryOption(llvm::StringRef Lib,
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llvm::SmallString<24> &Opt) const;
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/// Gets the linker options necessary to detect object file mismatches on
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/// this platform.
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virtual void getDetectMismatchOption(llvm::StringRef Name,
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llvm::StringRef Value,
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llvm::SmallString<32> &Opt) const {}
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/// Get LLVM calling convention for OpenCL kernel.
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virtual unsigned getOpenCLKernelCallingConv() const;
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/// Get target specific null pointer.
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/// \param T is the LLVM type of the null pointer.
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/// \param QT is the clang QualType of the null pointer.
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/// \return ConstantPointerNull with the given type \p T.
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/// Each target can override it to return its own desired constant value.
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virtual llvm::Constant *getNullPointer(const CodeGen::CodeGenModule &CGM,
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llvm::PointerType *T, QualType QT) const;
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/// Get target favored AST address space of a global variable for languages
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/// other than OpenCL and CUDA.
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/// If \p D is nullptr, returns the default target favored address space
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/// for global variable.
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virtual LangAS getGlobalVarAddressSpace(CodeGenModule &CGM,
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const VarDecl *D) const;
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/// Get the AST address space for alloca.
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virtual LangAS getASTAllocaAddressSpace() const { return LangAS::Default; }
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/// Perform address space cast of an expression of pointer type.
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/// \param V is the LLVM value to be casted to another address space.
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/// \param SrcAddr is the language address space of \p V.
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/// \param DestAddr is the targeted language address space.
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/// \param DestTy is the destination LLVM pointer type.
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/// \param IsNonNull is the flag indicating \p V is known to be non null.
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virtual llvm::Value *performAddrSpaceCast(CodeGen::CodeGenFunction &CGF,
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llvm::Value *V, LangAS SrcAddr,
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LangAS DestAddr, llvm::Type *DestTy,
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bool IsNonNull = false) const;
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/// Perform address space cast of a constant expression of pointer type.
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/// \param V is the LLVM constant to be casted to another address space.
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/// \param SrcAddr is the language address space of \p V.
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/// \param DestAddr is the targeted language address space.
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/// \param DestTy is the destination LLVM pointer type.
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virtual llvm::Constant *performAddrSpaceCast(CodeGenModule &CGM,
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llvm::Constant *V,
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LangAS SrcAddr, LangAS DestAddr,
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llvm::Type *DestTy) const;
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/// Get address space of pointer parameter for __cxa_atexit.
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virtual LangAS getAddrSpaceOfCxaAtexitPtrParam() const {
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return LangAS::Default;
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}
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/// Get the syncscope used in LLVM IR.
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virtual llvm::SyncScope::ID getLLVMSyncScopeID(const LangOptions &LangOpts,
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SyncScope Scope,
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llvm::AtomicOrdering Ordering,
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llvm::LLVMContext &Ctx) const;
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/// Interface class for filling custom fields of a block literal for OpenCL.
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class TargetOpenCLBlockHelper {
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public:
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typedef std::pair<llvm::Value *, StringRef> ValueTy;
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TargetOpenCLBlockHelper() {}
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virtual ~TargetOpenCLBlockHelper() {}
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/// Get the custom field types for OpenCL blocks.
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virtual llvm::SmallVector<llvm::Type *, 1> getCustomFieldTypes() = 0;
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/// Get the custom field values for OpenCL blocks.
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virtual llvm::SmallVector<ValueTy, 1>
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getCustomFieldValues(CodeGenFunction &CGF, const CGBlockInfo &Info) = 0;
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virtual bool areAllCustomFieldValuesConstant(const CGBlockInfo &Info) = 0;
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/// Get the custom field values for OpenCL blocks if all values are LLVM
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/// constants.
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virtual llvm::SmallVector<llvm::Constant *, 1>
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getCustomFieldValues(CodeGenModule &CGM, const CGBlockInfo &Info) = 0;
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};
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virtual TargetOpenCLBlockHelper *getTargetOpenCLBlockHelper() const {
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return nullptr;
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}
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/// Create an OpenCL kernel for an enqueued block. The kernel function is
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/// a wrapper for the block invoke function with target-specific calling
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/// convention and ABI as an OpenCL kernel. The wrapper function accepts
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/// block context and block arguments in target-specific way and calls
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/// the original block invoke function.
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virtual llvm::Function *
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createEnqueuedBlockKernel(CodeGenFunction &CGF,
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llvm::Function *BlockInvokeFunc,
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llvm::Value *BlockLiteral) const;
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/// \return true if the target supports alias from the unmangled name to the
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/// mangled name of functions declared within an extern "C" region and marked
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/// as 'used', and having internal linkage.
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virtual bool shouldEmitStaticExternCAliases() const { return true; }
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virtual void setCUDAKernelCallingConvention(const FunctionType *&FT) const {}
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/// Return the device-side type for the CUDA device builtin surface type.
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virtual llvm::Type *getCUDADeviceBuiltinSurfaceDeviceType() const {
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// By default, no change from the original one.
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return nullptr;
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}
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/// Return the device-side type for the CUDA device builtin texture type.
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virtual llvm::Type *getCUDADeviceBuiltinTextureDeviceType() const {
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// By default, no change from the original one.
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return nullptr;
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}
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/// Emit the device-side copy of the builtin surface type.
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virtual bool emitCUDADeviceBuiltinSurfaceDeviceCopy(CodeGenFunction &CGF,
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LValue Dst,
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LValue Src) const {
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// DO NOTHING by default.
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return false;
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}
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/// Emit the device-side copy of the builtin texture type.
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virtual bool emitCUDADeviceBuiltinTextureDeviceCopy(CodeGenFunction &CGF,
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LValue Dst,
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LValue Src) const {
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// DO NOTHING by default.
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return false;
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}
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};
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} // namespace CodeGen
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} // namespace clang
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#endif // LLVM_CLANG_LIB_CODEGEN_TARGETINFO_H
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