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https://github.com/c64scene-ar/llvm-6502.git
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llvm-mc: Match a few X86 instructions.
- This is "experimental" code, I am feeling my way around and working out the best way to do things (and learning tblgen in the process). Comments welcome, but keep in mind this stuff will change radically. - This is enough to match "subb" and friends, but not much else. The next step is to automatically generate the matchers for individual operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77657 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar
parent
933c762371
commit
a027d222e1
@ -12,6 +12,7 @@
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#include "llvm/ADT/Twine.h"
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#include "llvm/MC/MCAsmLexer.h"
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#include "llvm/MC/MCAsmParser.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCValue.h"
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#include "llvm/Support/SourceMgr.h"
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#include "llvm/Target/TargetRegistry.h"
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@ -291,16 +292,10 @@ bool X86ATTAsmParser::ParseMemOperand(X86Operand &Op) {
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return false;
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}
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bool
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X86ATTAsmParser::MatchInstruction(const StringRef &Name,
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SmallVectorImpl<X86Operand> &Operands,
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MCInst &Inst) {
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return false;
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}
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bool X86ATTAsmParser::ParseInstruction(const StringRef &Name, MCInst &Inst) {
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SmallVector<X86Operand, 3> Operands;
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SMLoc Loc = getLexer().getTok().getLoc();
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if (getLexer().isNot(AsmToken::EndOfStatement)) {
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// Read the first operand.
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Operands.push_back(X86Operand());
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@ -317,7 +312,15 @@ bool X86ATTAsmParser::ParseInstruction(const StringRef &Name, MCInst &Inst) {
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}
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}
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return MatchInstruction(Name, Operands, Inst);
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if (!MatchInstruction(Name, Operands, Inst))
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return false;
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// FIXME: We should give nicer diagnostics about the exact failure.
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// FIXME: For now we just treat unrecognized instructions as "warnings".
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Warning(Loc, "unrecognized instruction");
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return false;
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}
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// Force static initialization.
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@ -326,4 +329,64 @@ extern "C" void LLVMInitializeX86AsmParser() {
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RegisterAsmParser<X86ATTAsmParser> Y(TheX86_64Target);
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}
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// FIXME: These should come from tblgen.
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// Match_X86_Op_GR8
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static bool
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Match_X86_Op_GR8(const X86Operand &Op, MCOperand *MCOps, unsigned NumOps) {
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assert(NumOps == 1 && "Invalid number of ops!");
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// FIXME: Match correct registers.
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if (Op.Kind != X86Operand::Register)
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return true;
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MCOps[0].MakeReg(Op.getReg());
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return false;
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}
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#define DUMMY(name) \
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static bool Match_X86_Op_##name(const X86Operand &Op, \
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MCOperand *MCOps, \
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unsigned NumMCOps) { \
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return true; \
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}
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DUMMY(FR32)
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DUMMY(FR64)
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DUMMY(GR16)
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DUMMY(GR32)
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DUMMY(GR32_NOREX)
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DUMMY(GR64)
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DUMMY(GR8_NOREX)
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DUMMY(RST)
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DUMMY(VR128)
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DUMMY(VR64)
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DUMMY(brtarget)
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DUMMY(brtarget8)
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DUMMY(f128mem)
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DUMMY(f32mem)
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DUMMY(f64mem)
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DUMMY(f80mem)
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DUMMY(i128mem)
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DUMMY(i16i8imm)
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DUMMY(i16imm)
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DUMMY(i16mem)
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DUMMY(i32i8imm)
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DUMMY(i32imm_pcrel)
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DUMMY(i32imm)
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DUMMY(i32mem)
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DUMMY(i64i32imm_pcrel)
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DUMMY(i64i32imm)
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DUMMY(i64i8imm)
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DUMMY(i64imm)
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DUMMY(i64mem)
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DUMMY(i8imm)
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DUMMY(i8mem_NOREX)
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DUMMY(i8mem)
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DUMMY(lea32mem)
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DUMMY(lea64_32mem)
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DUMMY(lea64mem)
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DUMMY(sdmem)
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DUMMY(ssmem)
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#include "X86GenAsmMatcher.inc"
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5
test/MC/AsmParser/x86_instructions.s
Normal file
5
test/MC/AsmParser/x86_instructions.s
Normal file
@ -0,0 +1,5 @@
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// RUN: llvm-mc -triple i386-unknown-unknown %s | FileCheck %s
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# Simple instructions
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subb %al, %al
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# CHECK: MCInst(opcode=1831, operands=[reg:2, reg:0, reg:2])
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@ -1,6 +1,6 @@
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// FIXME: Actually test that we get the expected results.
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// RUN: llvm-mc -triple i386-unknown-unknown %s > %t
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// RUN: llvm-mc -triple i386-unknown-unknown %s > %t 2> %t2
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# Immediates
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push $1
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@ -15,8 +15,71 @@
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#include "AsmMatcherEmitter.h"
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#include "CodeGenTarget.h"
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#include "Record.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/Debug.h"
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#include <set>
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#include <list>
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using namespace llvm;
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/// FlattenVariants - Flatten an .td file assembly string by selecting the
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/// variant at index \arg N.
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static std::string FlattenVariants(const std::string &AsmString,
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unsigned N) {
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StringRef Cur = AsmString;
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std::string Res = "";
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for (;;) {
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// Add the prefix until the next '{', and split out the contents in the
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// braces.
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std::pair<StringRef, StringRef> Inner, Split = Cur.split('{');
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Res += Split.first;
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if (Split.second.empty())
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break;
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Inner = Split.second.split('}');
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// Select the Nth variant (or empty).
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StringRef Selection = Inner.first;
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for (unsigned i = 0; i != N; ++i)
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Selection = Selection.split('|').second;
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Res += Selection.split('|').first;
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Cur = Inner.second;
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}
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return Res;
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}
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/// TokenizeAsmString - Tokenize a simplified assembly string.
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static void TokenizeAsmString(const std::string &AsmString,
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SmallVectorImpl<StringRef> &Tokens) {
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unsigned Prev = 0;
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bool InTok = true;
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for (unsigned i = 0, e = AsmString.size(); i != e; ++i) {
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switch (AsmString[i]) {
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case '*':
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case '!':
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case ' ':
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case '\t':
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case ',':
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if (InTok) {
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Tokens.push_back(StringRef(&AsmString[Prev], i - Prev));
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InTok = false;
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}
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if (AsmString[i] == '*' || AsmString[i] == '!')
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Tokens.push_back(StringRef(&AsmString[i], 1));
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Prev = i + 1;
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break;
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default:
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InTok = true;
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}
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}
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if (InTok && Prev != AsmString.size())
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Tokens.push_back(StringRef(&AsmString[Prev], AsmString.size() - Prev));
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}
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void AsmMatcherEmitter::run(raw_ostream &OS) {
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CodeGenTarget Target;
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const std::vector<CodeGenRegister> &Registers = Target.getRegisters();
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@ -44,4 +107,180 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
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}
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OS << " return true;\n";
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OS << "}\n";
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// Emit the function to match instructions.
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std::vector<const CodeGenInstruction*> NumberedInstructions;
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Target.getInstructionsByEnumValue(NumberedInstructions);
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std::list<std::string> MatchFns;
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OS << "\n";
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const std::map<std::string, CodeGenInstruction> &Instructions =
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Target.getInstructions();
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for (std::map<std::string, CodeGenInstruction>::const_iterator
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it = Instructions.begin(), ie = Instructions.end(); it != ie; ++it) {
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const CodeGenInstruction &CGI = it->second;
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// Ignore psuedo ops.
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//
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// FIXME: This is a hack.
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if (const RecordVal *Form = CGI.TheDef->getValue("Form"))
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if (Form->getValue()->getAsString() == "Pseudo")
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continue;
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// Ignore instructions with no .s string.
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//
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// FIXME: What are these?
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if (CGI.AsmString.empty())
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continue;
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// FIXME: Hack; ignore "lock".
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if (StringRef(CGI.AsmString).startswith("lock"))
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continue;
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// FIXME: Hack.
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#if 0
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if (1 && it->first != "SUB8mr")
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continue;
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#endif
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std::string Flattened = FlattenVariants(CGI.AsmString, 0);
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SmallVector<StringRef, 8> Tokens;
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TokenizeAsmString(Flattened, Tokens);
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DEBUG({
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outs() << it->first << " -- flattened:\""
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<< Flattened << "\", tokens:[";
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for (unsigned i = 0, e = Tokens.size(); i != e; ++i) {
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outs() << Tokens[i];
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if (i + 1 != e)
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outs() << ", ";
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}
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outs() << "]\n";
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for (unsigned i = 0, e = CGI.OperandList.size(); i != e; ++i) {
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const CodeGenInstruction::OperandInfo &OI = CGI.OperandList[i];
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outs() << " op[" << i << "] = " << OI.Name
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<< " " << OI.Rec->getName()
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<< " (" << OI.MIOperandNo << ", " << OI.MINumOperands << ")\n";
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}
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});
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// FIXME: Ignore non-literal tokens.
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if (std::find(Tokens[0].begin(), Tokens[0].end(), '$') != Tokens[0].end())
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continue;
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std::string FnName = "Match_" + Target.getName() + "_Inst_" + it->first;
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MatchFns.push_back(FnName);
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OS << "static bool " << FnName
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<< "(const StringRef &Name,"
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<< " SmallVectorImpl<X86Operand> &Operands,"
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<< " MCInst &Inst) {\n\n";
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OS << " // Match name.\n";
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OS << " if (Name != \"" << Tokens[0] << "\")\n";
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OS << " return true;\n\n";
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OS << " // Match number of operands.\n";
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OS << " if (Operands.size() != " << Tokens.size() - 1 << ")\n";
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OS << " return true;\n\n";
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// Compute the total number of MCOperands.
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//
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// FIXME: Isn't this somewhere else?
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unsigned NumMIOperands = 0;
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for (unsigned i = 0, e = CGI.OperandList.size(); i != e; ++i) {
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const CodeGenInstruction::OperandInfo &OI = CGI.OperandList[i];
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NumMIOperands = std::max(NumMIOperands,
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OI.MIOperandNo + OI.MINumOperands);
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}
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std::set<unsigned> MatchedOperands;
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// This the list of operands we need to fill in.
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if (NumMIOperands)
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OS << " MCOperand Ops[" << NumMIOperands << "];\n\n";
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unsigned ParsedOpIdx = 0;
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for (unsigned i = 1, e = Tokens.size(); i < e; ++i) {
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// FIXME: Can only match simple operands.
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if (Tokens[i][0] != '$') {
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OS << " // FIXME: unable to match token: '" << Tokens[i] << "'!\n";
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OS << " return true;\n\n";
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continue;
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}
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// Map this token to an operand. FIXME: Move elsewhere.
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unsigned Idx;
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try {
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Idx = CGI.getOperandNamed(Tokens[i].substr(1));
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} catch(...) {
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OS << " // FIXME: unable to find operand: '" << Tokens[i] << "'!\n";
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OS << " return true;\n\n";
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continue;
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}
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// FIXME: Each match routine should always end up filling the same number
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// of operands, we should just check that the number matches what the
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// match routine expects here instead of passing it. We can do this once
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// we start generating the class match functions.
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const CodeGenInstruction::OperandInfo &OI = CGI.OperandList[Idx];
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// Track that we have matched these operands.
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//
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// FIXME: Verify that we don't parse something to the same operand twice.
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for (unsigned j = 0; j != OI.MINumOperands; ++j)
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MatchedOperands.insert(OI.MIOperandNo + j);
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OS << " // Match '" << Tokens[i] << "' (parsed operand " << ParsedOpIdx
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<< ") to machine operands [" << OI.MIOperandNo << ", "
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<< OI.MIOperandNo + OI.MINumOperands << ").\n";
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OS << " if (Match_" << Target.getName()
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<< "_Op_" << OI.Rec->getName() << "("
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<< "Operands[" << ParsedOpIdx << "], "
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<< "&Ops[" << OI.MIOperandNo << "], "
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<< OI.MINumOperands << "))\n";
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OS << " return true;\n\n";
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++ParsedOpIdx;
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}
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// Generate code to construct the MCInst.
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OS << " // Construct MCInst.\n";
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OS << " Inst.setOpcode(" << Target.getName() << "::"
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<< it->first << ");\n";
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for (unsigned i = 0, e = NumMIOperands; i != e; ++i) {
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// FIXME: Oops! Ignore this for now, the instruction should print ok. If
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// we need to evaluate the constraints.
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if (!MatchedOperands.count(i)) {
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OS << "\n";
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OS << " // FIXME: Nothing matched Ops[" << i << "]!\n";
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OS << " Ops[" << i << "].MakeReg(0);\n";
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OS << "\n";
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}
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OS << " Inst.addOperand(Ops[" << i << "]);\n";
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}
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OS << "\n";
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OS << " return false;\n";
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OS << "}\n\n";
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}
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// Generate the top level match function.
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OS << "bool " << Target.getName() << ClassName
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<< "::MatchInstruction(const StringRef &Name, "
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<< "SmallVectorImpl<" << Target.getName() << "Operand> &Operands, "
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<< "MCInst &Inst) {\n";
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for (std::list<std::string>::iterator it = MatchFns.begin(),
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ie = MatchFns.end(); it != ie; ++it) {
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OS << " if (!" << *it << "(Name, Operands, Inst))\n";
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OS << " return false;\n\n";
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}
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OS << " return true;\n";
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OS << "}\n\n";
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}
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