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f09378397e
per-function subtarget. Currently, code-gen passes the default or generic subtarget to the constructors of MCInstPrinter subclasses (see LLVMTargetMachine::addPassesToEmitFile), which enables some targets (AArch64, ARM, and X86) to change their instprinter's behavior based on the subtarget feature bits. Since the backend can now use different subtargets for each function, instprinter has to be changed to use the per-function subtarget rather than the default subtarget. This patch takes the first step towards enabling instprinter to change its behavior based on the per-function subtarget. It adds a bit "PassSubtarget" to AsmWriter which tells table-gen to pass a reference to MCSubtargetInfo to the various print methods table-gen auto-generates. I will follow up with changes to instprinters of AArch64, ARM, and X86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233411 91177308-0d34-0410-b5e6-96231b3b80d8
118 lines
4.2 KiB
C++
118 lines
4.2 KiB
C++
//===- AsmWriterInst.h - Classes encapsulating a printable inst -*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// These classes implement a parser for assembly strings. The parser splits
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// the string into operands, which can be literal strings (the constant bits of
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// the string), actual operands (i.e., operands from the MachineInstr), and
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// dynamically-generated text, specified by raw C++ code.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_UTILS_TABLEGEN_ASMWRITERINST_H
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#define LLVM_UTILS_TABLEGEN_ASMWRITERINST_H
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#include <string>
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#include <vector>
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namespace llvm {
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class CodeGenInstruction;
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class Record;
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struct AsmWriterOperand {
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enum OpType {
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// Output this text surrounded by quotes to the asm.
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isLiteralTextOperand,
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// This is the name of a routine to call to print the operand.
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isMachineInstrOperand,
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// Output this text verbatim to the asm writer. It is code that
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// will output some text to the asm.
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isLiteralStatementOperand
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} OperandType;
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/// Str - For isLiteralTextOperand, this IS the literal text. For
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/// isMachineInstrOperand, this is the PrinterMethodName for the operand..
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/// For isLiteralStatementOperand, this is the code to insert verbatim
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/// into the asm writer.
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std::string Str;
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/// CGIOpNo - For isMachineInstrOperand, this is the index of the operand in
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/// the CodeGenInstruction.
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unsigned CGIOpNo;
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/// MiOpNo - For isMachineInstrOperand, this is the operand number of the
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/// machine instruction.
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unsigned MIOpNo;
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/// MiModifier - For isMachineInstrOperand, this is the modifier string for
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/// an operand, specified with syntax like ${opname:modifier}.
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std::string MiModifier;
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// PassSubtarget - Pass MCSubtargetInfo to the print method if this is
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// equal to 1.
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// FIXME: Remove after all ports are updated.
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unsigned PassSubtarget;
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// To make VS STL happy
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AsmWriterOperand(OpType op = isLiteralTextOperand):OperandType(op) {}
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AsmWriterOperand(const std::string &LitStr,
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OpType op = isLiteralTextOperand)
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: OperandType(op), Str(LitStr) {}
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AsmWriterOperand(const std::string &Printer,
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unsigned _CGIOpNo,
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unsigned _MIOpNo,
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const std::string &Modifier,
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unsigned PassSubtarget,
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OpType op = isMachineInstrOperand)
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: OperandType(op), Str(Printer), CGIOpNo(_CGIOpNo), MIOpNo(_MIOpNo),
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MiModifier(Modifier), PassSubtarget(PassSubtarget) {}
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bool operator!=(const AsmWriterOperand &Other) const {
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if (OperandType != Other.OperandType || Str != Other.Str) return true;
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if (OperandType == isMachineInstrOperand)
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return MIOpNo != Other.MIOpNo || MiModifier != Other.MiModifier;
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return false;
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}
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bool operator==(const AsmWriterOperand &Other) const {
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return !operator!=(Other);
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}
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/// getCode - Return the code that prints this operand.
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std::string getCode() const;
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};
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class AsmWriterInst {
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public:
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std::vector<AsmWriterOperand> Operands;
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const CodeGenInstruction *CGI;
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AsmWriterInst(const CodeGenInstruction &CGI,
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unsigned Variant, unsigned PassSubtarget);
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/// MatchesAllButOneOp - If this instruction is exactly identical to the
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/// specified instruction except for one differing operand, return the
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/// differing operand number. Otherwise return ~0.
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unsigned MatchesAllButOneOp(const AsmWriterInst &Other) const;
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private:
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void AddLiteralString(const std::string &Str) {
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// If the last operand was already a literal text string, append this to
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// it, otherwise add a new operand.
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if (!Operands.empty() &&
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Operands.back().OperandType == AsmWriterOperand::isLiteralTextOperand)
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Operands.back().Str.append(Str);
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else
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Operands.push_back(AsmWriterOperand(Str));
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}
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};
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}
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#endif
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