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fc6877aec9
(missed files). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@74450 91177308-0d34-0410-b5e6-96231b3b80d8
93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
//===- AsmExpr.cpp - Assembly file expressions ----------------------------===//
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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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#include "AsmExpr.h"
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#include "llvm/MC/MCContext.h"
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#include "llvm/MC/MCValue.h"
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using namespace llvm;
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AsmExpr::~AsmExpr() {
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}
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bool AsmExpr::EvaluateAsAbsolute(MCContext &Ctx, int64_t &Res) const {
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switch (getKind()) {
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default:
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assert(0 && "Invalid assembly expression kind!");
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case Constant:
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Res = cast<AsmConstantExpr>(this)->getValue();
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return true;
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case SymbolRef: {
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MCSymbol *Sym = cast<AsmSymbolRefExpr>(this)->getSymbol();
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const MCValue *Value = Ctx.GetSymbolValue(Sym);
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// FIXME: Return more information about the failure.
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if (!Value || !Value->isConstant())
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return false;
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Res = Value->getConstant();
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return true;
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}
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case Unary: {
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const AsmUnaryExpr *AUE = cast<AsmUnaryExpr>(this);
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int64_t Value;
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if (!AUE->getSubExpr()->EvaluateAsAbsolute(Ctx, Value))
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return false;
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switch (AUE->getOpcode()) {
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case AsmUnaryExpr::LNot: Res = !Value; break;
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case AsmUnaryExpr::Minus: Res = -Value; break;
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case AsmUnaryExpr::Not: Res = ~Value; break;
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case AsmUnaryExpr::Plus: Res = +Value; break;
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}
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return true;
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}
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case Binary: {
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const AsmBinaryExpr *ABE = cast<AsmBinaryExpr>(this);
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int64_t LHS, RHS;
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if (!ABE->getLHS()->EvaluateAsAbsolute(Ctx, LHS) ||
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!ABE->getRHS()->EvaluateAsAbsolute(Ctx, RHS))
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return false;
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// FIXME: We need target hooks for the evaluation. It may be limited in
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// width, and gas defines the result of comparisons differently from Apple
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// as (the result is sign extended).
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switch (ABE->getOpcode()) {
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case AsmBinaryExpr::Add: Res = LHS + RHS; break;
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case AsmBinaryExpr::And: Res = LHS & RHS; break;
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case AsmBinaryExpr::Div: Res = LHS / RHS; break;
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case AsmBinaryExpr::EQ: Res = LHS == RHS; break;
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case AsmBinaryExpr::GT: Res = LHS > RHS; break;
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case AsmBinaryExpr::GTE: Res = LHS >= RHS; break;
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case AsmBinaryExpr::LAnd: Res = LHS && RHS; break;
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case AsmBinaryExpr::LOr: Res = LHS || RHS; break;
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case AsmBinaryExpr::LT: Res = LHS < RHS; break;
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case AsmBinaryExpr::LTE: Res = LHS <= RHS; break;
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case AsmBinaryExpr::Mod: Res = LHS % RHS; break;
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case AsmBinaryExpr::Mul: Res = LHS * RHS; break;
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case AsmBinaryExpr::NE: Res = LHS != RHS; break;
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case AsmBinaryExpr::Or: Res = LHS | RHS; break;
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case AsmBinaryExpr::Shl: Res = LHS << RHS; break;
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case AsmBinaryExpr::Shr: Res = LHS >> RHS; break;
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case AsmBinaryExpr::Sub: Res = LHS - RHS; break;
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case AsmBinaryExpr::Xor: Res = LHS ^ RHS; break;
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}
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return true;
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}
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}
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}
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