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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
206 lines
7.3 KiB
C++
206 lines
7.3 KiB
C++
//===- AsmWriterInst.h - Classes encapsulating a printable inst -----------===//
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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.
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//
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//===----------------------------------------------------------------------===//
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#include "AsmWriterInst.h"
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#include "CodeGenTarget.h"
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/TableGen/Error.h"
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#include "llvm/TableGen/Record.h"
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using namespace llvm;
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static bool isIdentChar(char C) {
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return (C >= 'a' && C <= 'z') ||
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(C >= 'A' && C <= 'Z') ||
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(C >= '0' && C <= '9') ||
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C == '_';
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}
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std::string AsmWriterOperand::getCode() const {
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if (OperandType == isLiteralTextOperand) {
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if (Str.size() == 1)
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return "O << '" + Str + "'; ";
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return "O << \"" + Str + "\"; ";
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}
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if (OperandType == isLiteralStatementOperand)
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return Str;
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std::string Result = Str + "(MI";
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if (MIOpNo != ~0U)
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Result += ", " + utostr(MIOpNo);
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if (PassSubtarget)
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Result += ", STI";
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Result += ", O";
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if (!MiModifier.empty())
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Result += ", \"" + MiModifier + '"';
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return Result + "); ";
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}
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/// ParseAsmString - Parse the specified Instruction's AsmString into this
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/// AsmWriterInst.
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///
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AsmWriterInst::AsmWriterInst(const CodeGenInstruction &CGI, unsigned Variant,
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unsigned PassSubtarget) {
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this->CGI = &CGI;
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// NOTE: Any extensions to this code need to be mirrored in the
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// AsmPrinter::printInlineAsm code that executes as compile time (assuming
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// that inline asm strings should also get the new feature)!
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std::string AsmString = CGI.FlattenAsmStringVariants(CGI.AsmString, Variant);
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std::string::size_type LastEmitted = 0;
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while (LastEmitted != AsmString.size()) {
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std::string::size_type DollarPos =
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AsmString.find_first_of("$\\", LastEmitted);
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if (DollarPos == std::string::npos) DollarPos = AsmString.size();
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// Emit a constant string fragment.
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if (DollarPos != LastEmitted) {
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for (; LastEmitted != DollarPos; ++LastEmitted)
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switch (AsmString[LastEmitted]) {
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case '\n':
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AddLiteralString("\\n");
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break;
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case '\t':
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AddLiteralString("\\t");
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break;
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case '"':
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AddLiteralString("\\\"");
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break;
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case '\\':
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AddLiteralString("\\\\");
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break;
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default:
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AddLiteralString(std::string(1, AsmString[LastEmitted]));
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break;
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}
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} else if (AsmString[DollarPos] == '\\') {
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if (DollarPos+1 != AsmString.size()) {
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if (AsmString[DollarPos+1] == 'n') {
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AddLiteralString("\\n");
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} else if (AsmString[DollarPos+1] == 't') {
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AddLiteralString("\\t");
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} else if (std::string("${|}\\").find(AsmString[DollarPos+1])
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!= std::string::npos) {
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AddLiteralString(std::string(1, AsmString[DollarPos+1]));
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} else {
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PrintFatalError("Non-supported escaped character found in instruction '" +
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CGI.TheDef->getName() + "'!");
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}
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LastEmitted = DollarPos+2;
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continue;
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}
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} else if (DollarPos+1 != AsmString.size() &&
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AsmString[DollarPos+1] == '$') {
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AddLiteralString("$"); // "$$" -> $
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LastEmitted = DollarPos+2;
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} else {
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// Get the name of the variable.
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std::string::size_type VarEnd = DollarPos+1;
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// handle ${foo}bar as $foo by detecting whether the character following
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// the dollar sign is a curly brace. If so, advance VarEnd and DollarPos
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// so the variable name does not contain the leading curly brace.
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bool hasCurlyBraces = false;
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if (VarEnd < AsmString.size() && '{' == AsmString[VarEnd]) {
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hasCurlyBraces = true;
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++DollarPos;
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++VarEnd;
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}
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while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
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++VarEnd;
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std::string VarName(AsmString.begin()+DollarPos+1,
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AsmString.begin()+VarEnd);
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// Modifier - Support ${foo:modifier} syntax, where "modifier" is passed
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// into printOperand. Also support ${:feature}, which is passed into
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// PrintSpecial.
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std::string Modifier;
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// In order to avoid starting the next string at the terminating curly
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// brace, advance the end position past it if we found an opening curly
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// brace.
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if (hasCurlyBraces) {
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if (VarEnd >= AsmString.size())
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PrintFatalError("Reached end of string before terminating curly brace in '"
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+ CGI.TheDef->getName() + "'");
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// Look for a modifier string.
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if (AsmString[VarEnd] == ':') {
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++VarEnd;
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if (VarEnd >= AsmString.size())
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PrintFatalError("Reached end of string before terminating curly brace in '"
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+ CGI.TheDef->getName() + "'");
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unsigned ModifierStart = VarEnd;
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while (VarEnd < AsmString.size() && isIdentChar(AsmString[VarEnd]))
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++VarEnd;
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Modifier = std::string(AsmString.begin()+ModifierStart,
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AsmString.begin()+VarEnd);
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if (Modifier.empty())
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PrintFatalError("Bad operand modifier name in '"+ CGI.TheDef->getName() + "'");
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}
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if (AsmString[VarEnd] != '}')
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PrintFatalError("Variable name beginning with '{' did not end with '}' in '"
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+ CGI.TheDef->getName() + "'");
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++VarEnd;
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}
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if (VarName.empty() && Modifier.empty())
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PrintFatalError("Stray '$' in '" + CGI.TheDef->getName() +
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"' asm string, maybe you want $$?");
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if (VarName.empty()) {
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// Just a modifier, pass this into PrintSpecial.
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Operands.push_back(AsmWriterOperand("PrintSpecial",
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~0U,
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~0U,
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Modifier,
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PassSubtarget));
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} else {
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// Otherwise, normal operand.
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unsigned OpNo = CGI.Operands.getOperandNamed(VarName);
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CGIOperandList::OperandInfo OpInfo = CGI.Operands[OpNo];
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unsigned MIOp = OpInfo.MIOperandNo;
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Operands.push_back(AsmWriterOperand(OpInfo.PrinterMethodName,
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OpNo, MIOp, Modifier,
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PassSubtarget));
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}
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LastEmitted = VarEnd;
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}
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}
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Operands.push_back(AsmWriterOperand("return;",
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AsmWriterOperand::isLiteralStatementOperand));
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}
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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 differing
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/// operand number. If more than one operand mismatches, return ~1, otherwise
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/// if the instructions are identical return ~0.
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unsigned AsmWriterInst::MatchesAllButOneOp(const AsmWriterInst &Other)const{
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if (Operands.size() != Other.Operands.size()) return ~1;
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unsigned MismatchOperand = ~0U;
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for (unsigned i = 0, e = Operands.size(); i != e; ++i) {
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if (Operands[i] != Other.Operands[i]) {
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if (MismatchOperand != ~0U) // Already have one mismatch?
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return ~1U;
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MismatchOperand = i;
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}
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}
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return MismatchOperand;
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}
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