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ab486fe71a
Passing INT64_MIN to MCInstPrinter::formatHex triggers undefined
behavior because the negation of -9223372036854775808 cannot be
represented in type 'int64_t' (aka 'long long'). This patch puts a
workaround in place to just print the hex value directly.
A possible alternative involves using a small helper functions that uses
(implementation) defined conversions to achieve the desirable value:
static int64_t helper(int64_t V) {
auto U = static_cast<uint64_t>(V);
return V < 0 ? -U : U;
}
The underlying problem is that MCInstPrinter::formatHex(int64_t) returns
a format_object<int64_t> and should really return a
format_object<uint64_t>. However, that's not possible because formatImm
needs to be able to print both as decimal (where a signed is required)
and hex (where we'd prefer to always have an unsigned).
format_object<int64_t> formatImm(int64_t Value) const {
return PrintImmHex ? formatHex(Value) : formatDec(Value);
}
Differential revision: https://reviews.llvm.org/D67236
llvm-svn: 371159
121 lines
3.5 KiB
C++
121 lines
3.5 KiB
C++
//===- MCInstPrinter.cpp - Convert an MCInst to target assembly syntax ----===//
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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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#include "llvm/MC/MCInstPrinter.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/ADT/StringRef.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <cinttypes>
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#include <cstdint>
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using namespace llvm;
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void llvm::dumpBytes(ArrayRef<uint8_t> bytes, raw_ostream &OS) {
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static const char hex_rep[] = "0123456789abcdef";
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bool First = true;
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for (char i: bytes) {
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if (First)
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First = false;
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else
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OS << ' ';
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OS << hex_rep[(i & 0xF0) >> 4];
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OS << hex_rep[i & 0xF];
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}
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}
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MCInstPrinter::~MCInstPrinter() = default;
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/// getOpcodeName - Return the name of the specified opcode enum (e.g.
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/// "MOV32ri") or empty if we can't resolve it.
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StringRef MCInstPrinter::getOpcodeName(unsigned Opcode) const {
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return MII.getName(Opcode);
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}
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void MCInstPrinter::printRegName(raw_ostream &OS, unsigned RegNo) const {
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llvm_unreachable("Target should implement this");
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}
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void MCInstPrinter::printAnnotation(raw_ostream &OS, StringRef Annot) {
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if (!Annot.empty()) {
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if (CommentStream) {
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(*CommentStream) << Annot;
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// By definition (see MCInstPrinter.h), CommentStream must end with
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// a newline after each comment.
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if (Annot.back() != '\n')
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(*CommentStream) << '\n';
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} else
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OS << " " << MAI.getCommentString() << " " << Annot;
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}
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}
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/// Utility functions to make adding mark ups simpler.
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StringRef MCInstPrinter::markup(StringRef s) const {
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if (getUseMarkup())
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return s;
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else
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return "";
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}
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// For asm-style hex (e.g. 0ffh) the first digit always has to be a number.
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static bool needsLeadingZero(uint64_t Value)
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{
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while (Value)
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{
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uint64_t digit = (Value >> 60) & 0xf;
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if (digit != 0)
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return (digit >= 0xa);
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Value <<= 4;
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}
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return false;
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}
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format_object<int64_t> MCInstPrinter::formatDec(int64_t Value) const {
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return format("%" PRId64, Value);
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}
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format_object<int64_t> MCInstPrinter::formatHex(int64_t Value) const {
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switch (PrintHexStyle) {
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case HexStyle::C:
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if (Value < 0) {
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if (Value == std::numeric_limits<int64_t>::min())
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return format<int64_t>("-0x8000000000000000", Value);
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return format("-0x%" PRIx64, -Value);
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}
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return format("0x%" PRIx64, Value);
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case HexStyle::Asm:
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if (Value < 0) {
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if (Value == std::numeric_limits<int64_t>::min())
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return format<int64_t>("-8000000000000000h", Value);
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if (needsLeadingZero(-(uint64_t)(Value)))
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return format("-0%" PRIx64 "h", -Value);
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return format("-%" PRIx64 "h", -Value);
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}
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if (needsLeadingZero((uint64_t)(Value)))
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return format("0%" PRIx64 "h", Value);
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return format("%" PRIx64 "h", Value);
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}
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llvm_unreachable("unsupported print style");
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}
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format_object<uint64_t> MCInstPrinter::formatHex(uint64_t Value) const {
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switch(PrintHexStyle) {
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case HexStyle::C:
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return format("0x%" PRIx64, Value);
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case HexStyle::Asm:
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if (needsLeadingZero(Value))
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return format("0%" PRIx64 "h", Value);
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else
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return format("%" PRIx64 "h", Value);
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}
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llvm_unreachable("unsupported print style");
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}
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