58669354bf
The extension codespace for DWARF expressions (DW_OP_LLVM_{lo,hi}_user)
has shrunk over time, as no extension is ever "retired" in practice. To
facilitate future extensions, this patch reserves one open opcode as an extension
point (0xfe), which is followed by a ULEB128-encoded SubOperation, and
then by the subop's operands.
There is some prior-art, namely DW_OP_AARCH64_operation
(see edd7460d87/aadwarf64/aadwarf64.rst (45dwarf-expression-operations)).
This version makes some different tradeoffs, opting to use a ULEB128 for
the subop encoding for future-proofing.
Reviewed By: #debug-info, dblaikie
Differential Revision: https://reviews.llvm.org/D147271
144 lines
4.3 KiB
C++
144 lines
4.3 KiB
C++
//===- llvm/unittest/DebugInfo/DWARFExpressionCompactPrinterTest.cpp ------===//
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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 "DwarfGenerator.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFDie.h"
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#include "llvm/DebugInfo/DWARF/DWARFExpression.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/TargetRegistry.h"
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#include "llvm/Support/DataExtractor.h"
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#include "llvm/Support/TargetSelect.h"
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#include "llvm/Testing/Support/Error.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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using namespace dwarf;
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namespace {
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class DWARFExpressionCompactPrinterTest : public ::testing::Test {
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public:
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std::unique_ptr<MCRegisterInfo> MRI;
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DWARFExpressionCompactPrinterTest() {
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InitializeAllTargets();
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InitializeAllTargetMCs();
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InitializeAllAsmPrinters();
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std::string TripleName = "armv8a-linux-gnueabi";
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std::string ErrorStr;
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const Target *TheTarget =
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TargetRegistry::lookupTarget(TripleName, ErrorStr);
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if (!TheTarget)
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return;
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MRI.reset(TheTarget->createMCRegInfo(TripleName));
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}
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void TestExprPrinter(ArrayRef<uint8_t> ExprData, StringRef Expected);
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};
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} // namespace
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void DWARFExpressionCompactPrinterTest::TestExprPrinter(
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ArrayRef<uint8_t> ExprData, StringRef Expected) {
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// If we didn't build ARM, do not run the test.
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if (!MRI)
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GTEST_SKIP();
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// Print the expression, passing in the subprogram DIE, and check that the
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// result is as expected.
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std::string Result;
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raw_string_ostream OS(Result);
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DataExtractor DE(ExprData, true, 8);
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DWARFExpression Expr(DE, 8);
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auto GetRegName = [&](uint64_t DwarfRegNum, bool IsEH) -> StringRef {
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if (std::optional<unsigned> LLVMRegNum =
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this->MRI->getLLVMRegNum(DwarfRegNum, IsEH))
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if (const char *RegName = this->MRI->getName(*LLVMRegNum))
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return llvm::StringRef(RegName);
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OS << "<unknown register " << DwarfRegNum << ">";
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return {};
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};
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Expr.printCompact(OS, GetRegName);
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EXPECT_EQ(OS.str(), Expected);
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_reg0) {
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TestExprPrinter({DW_OP_reg0}, "R0");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_reg10) {
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TestExprPrinter({DW_OP_reg10}, "R10");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_regx) {
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TestExprPrinter({DW_OP_regx, 0x80, 0x02}, "D0");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0) {
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TestExprPrinter({DW_OP_breg0, 0x04}, "[R0+4]");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0_large_offset) {
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TestExprPrinter({DW_OP_breg0, 0x80, 0x02}, "[R0+256]");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg13) {
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TestExprPrinter({DW_OP_breg13, 0x10}, "[SP+16]");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg13_zero_offset) {
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TestExprPrinter({DW_OP_breg13, 0x00}, "[SP]");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_breg0_negative) {
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TestExprPrinter({DW_OP_breg0, 0x70}, "[R0-16]");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_bregx) {
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TestExprPrinter({DW_OP_bregx, 0x0d, 0x28}, "[SP+40]");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_stack_value) {
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TestExprPrinter({DW_OP_breg13, 0x04, DW_OP_stack_value}, "SP+4");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_entry_value) {
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TestExprPrinter({DW_OP_entry_value, 0x01, DW_OP_reg0, DW_OP_stack_value},
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"entry(R0)");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_entry_value_mem) {
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TestExprPrinter(
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{DW_OP_entry_value, 0x02, DW_OP_breg13, 0x10, DW_OP_stack_value},
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"entry([SP+16])");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_nop) {
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TestExprPrinter({DW_OP_nop}, "<stack of size 0, expected 1>");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_LLVM_nop) {
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TestExprPrinter({DW_OP_LLVM_user, DW_OP_LLVM_nop},
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"<stack of size 0, expected 1>");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_nop_OP_reg) {
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TestExprPrinter({DW_OP_nop, DW_OP_reg0}, "R0");
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}
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TEST_F(DWARFExpressionCompactPrinterTest, Test_OP_LLVM_nop_OP_reg) {
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TestExprPrinter({DW_OP_LLVM_user, DW_OP_LLVM_nop, DW_OP_reg0}, "R0");
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}
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