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llvm-mirror/unittests/CodeGen/LexicalScopesTest.cpp
Jeremy Morse 80365b065d [DebugInfo] Re-implement LexicalScopes dominance method, add unit tests 
Way back in D24994, the combination of LexicalScopes::dominates and
LiveDebugValues was identified as having worst-case quadratic complexity,
but it wasn't triggered by any code path at the time. I've since run into a
scenario where this occurs, in a very large basic block where large numbers
of inlined DBG_VALUEs are present.

The quadratic-ness comes from LiveDebugValues::join calling "dominates" on
every variable location, and LexicalScopes::dominates potentially touching
every instruction in a block to test for the presence of a scope. We have,
however, already computed the presence of scopes in blocks, in the
"InstrRanges" of each scope. This patch switches the dominates method to
examine whether a block is present in a scope's InsnRanges, avoiding
walking through the whole block.

At the same time, fix getMachineBasicBlocks to account for the fact that
InsnRanges can cover multiple blocks, and add some unit tests, as Lexical
Scopes didn't have any.

Differential revision: https://reviews.llvm.org/D73725
2020-02-28 11:41:28 +00:00

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//===----------- llvm/unittest/CodeGen/LexicalScopesTest.cpp --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineBasicBlock.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstr.h"
#include "llvm/CodeGen/MachineMemOperand.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/CodeGen/TargetInstrInfo.h"
#include "llvm/CodeGen/TargetLowering.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/ModuleSlotTracker.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/TargetRegistry.h"
#include "llvm/Support/TargetSelect.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
#include "gtest/gtest.h"
using namespace llvm;
namespace {
// Include helper functions to ease the manipulation of MachineFunctions
#include "MFCommon.inc"
class LexicalScopesTest : public testing::Test {
public:
// Boilerplate,
LLVMContext Ctx;
Module Mod;
std::unique_ptr<MachineFunction> MF;
DICompileUnit *OurCU;
DIFile *OurFile;
DISubprogram *OurFunc;
DILexicalBlock *OurBlock, *AnotherBlock;
DISubprogram *ToInlineFunc;
DILexicalBlock *ToInlineBlock;
// DebugLocs that we'll used to create test environments.
DebugLoc OutermostLoc, InBlockLoc, NotNestedBlockLoc, InlinedLoc;
// Test environment blocks -- these form a diamond control flow pattern,
// MBB1 being the entry block, blocks two and three being the branches, and
// block four joining the branches and being an exit block.
MachineBasicBlock *MBB1, *MBB2, *MBB3, *MBB4;
// Some meaningless instructions -- the first is fully meaningless,
// while the second is supposed to impersonate DBG_VALUEs through its
// opcode.
MCInstrDesc BeanInst;
MCInstrDesc DbgValueInst;
LexicalScopesTest() : Ctx(), Mod("beehives", Ctx) {
memset(&BeanInst, 0, sizeof(BeanInst));
BeanInst.Opcode = 1;
BeanInst.Size = 1;
memset(&DbgValueInst, 0, sizeof(DbgValueInst));
DbgValueInst.Opcode = TargetOpcode::DBG_VALUE;
DbgValueInst.Size = 1;
// Boilerplate that creates a MachineFunction and associated blocks.
MF = createMachineFunction(Ctx, Mod);
llvm::Function &F = const_cast<llvm::Function &>(MF->getFunction());
auto BB1 = BasicBlock::Create(Ctx, "a", &F);
auto BB2 = BasicBlock::Create(Ctx, "b", &F);
auto BB3 = BasicBlock::Create(Ctx, "c", &F);
auto BB4 = BasicBlock::Create(Ctx, "d", &F);
IRBuilder<> IRB1(BB1), IRB2(BB2), IRB3(BB3), IRB4(BB4);
IRB1.CreateBr(BB2);
IRB2.CreateBr(BB3);
IRB3.CreateBr(BB4);
IRB4.CreateRetVoid();
MBB1 = MF->CreateMachineBasicBlock(BB1);
MF->insert(MF->end(), MBB1);
MBB2 = MF->CreateMachineBasicBlock(BB2);
MF->insert(MF->end(), MBB2);
MBB3 = MF->CreateMachineBasicBlock(BB3);
MF->insert(MF->end(), MBB3);
MBB4 = MF->CreateMachineBasicBlock(BB4);
MF->insert(MF->end(), MBB4);
MBB1->addSuccessor(MBB2);
MBB1->addSuccessor(MBB3);
MBB2->addSuccessor(MBB4);
MBB3->addSuccessor(MBB4);
// Create metadata: CU, subprogram, some blocks and an inline function
// scope.
DIBuilder DIB(Mod);
OurFile = DIB.createFile("xyzzy.c", "/cave");
OurCU =
DIB.createCompileUnit(dwarf::DW_LANG_C99, OurFile, "nou", false, "", 0);
auto OurSubT = DIB.createSubroutineType(DIB.getOrCreateTypeArray(None));
OurFunc =
DIB.createFunction(OurCU, "bees", "", OurFile, 1, OurSubT, 1,
DINode::FlagZero, DISubprogram::SPFlagDefinition);
F.setSubprogram(OurFunc);
OurBlock = DIB.createLexicalBlock(OurFunc, OurFile, 2, 3);
AnotherBlock = DIB.createLexicalBlock(OurFunc, OurFile, 2, 6);
ToInlineFunc =
DIB.createFunction(OurFile, "shoes", "", OurFile, 10, OurSubT, 10,
DINode::FlagZero, DISubprogram::SPFlagDefinition);
// Make some nested scopes.
OutermostLoc = DebugLoc::get(3, 1, OurFunc);
InBlockLoc = DebugLoc::get(4, 1, OurBlock);
InlinedLoc = DebugLoc::get(10, 1, ToInlineFunc, InBlockLoc.get());
// Make a scope that isn't nested within the others.
NotNestedBlockLoc = DebugLoc::get(4, 1, AnotherBlock);
DIB.finalize();
}
};
// Fill blocks with dummy instructions, test some base lexical scope
// functionaliy.
TEST_F(LexicalScopesTest, FlatLayout) {
BuildMI(*MBB1, MBB1->end(), OutermostLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), OutermostLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), OutermostLoc, BeanInst);
BuildMI(*MBB4, MBB4->end(), OutermostLoc, BeanInst);
LexicalScopes LS;
EXPECT_TRUE(LS.empty());
LS.reset();
EXPECT_EQ(LS.getCurrentFunctionScope(), nullptr);
LS.initialize(*MF);
EXPECT_FALSE(LS.empty());
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
EXPECT_EQ(FuncScope->getParent(), nullptr);
EXPECT_EQ(FuncScope->getDesc(), OurFunc);
EXPECT_EQ(FuncScope->getInlinedAt(), nullptr);
EXPECT_EQ(FuncScope->getScopeNode(), OurFunc);
EXPECT_FALSE(FuncScope->isAbstractScope());
EXPECT_EQ(FuncScope->getChildren().size(), 0u);
// There should be one range, covering the whole function. Test that it
// points at the correct instructions.
auto &Ranges = FuncScope->getRanges();
ASSERT_EQ(Ranges.size(), 1u);
EXPECT_EQ(Ranges.front().first, &*MF->begin()->begin());
auto BBIt = MF->end();
BBIt = std::prev(BBIt);
EXPECT_EQ(Ranges.front().second, &*BBIt->begin());
EXPECT_TRUE(FuncScope->dominates(FuncScope));
SmallPtrSet<const MachineBasicBlock *, 4> MBBVec;
LS.getMachineBasicBlocks(OutermostLoc.get(), MBBVec);
EXPECT_EQ(MBBVec.size(), 4u);
// All the blocks should be in that set; the outermost loc should dominate
// them; and no other scope should.
for (auto &MBB : *MF) {
EXPECT_EQ(MBBVec.count(&MBB), 1u);
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), &MBB));
EXPECT_FALSE(LS.dominates(InBlockLoc.get(), &MBB));
EXPECT_FALSE(LS.dominates(InlinedLoc.get(), &MBB));
}
}
// Examine relationship between two nested scopes inside the function, the
// outer function and the lexical block within it.
TEST_F(LexicalScopesTest, BlockScopes) {
BuildMI(*MBB1, MBB1->end(), InBlockLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), InBlockLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), InBlockLoc, BeanInst);
BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
EXPECT_EQ(FuncScope->getDesc(), OurFunc);
auto &Children = FuncScope->getChildren();
ASSERT_EQ(Children.size(), 1u);
auto *BlockScope = Children[0];
EXPECT_EQ(LS.findLexicalScope(InBlockLoc.get()), BlockScope);
EXPECT_EQ(BlockScope->getDesc(), InBlockLoc->getScope());
EXPECT_FALSE(BlockScope->isAbstractScope());
EXPECT_TRUE(FuncScope->dominates(BlockScope));
EXPECT_FALSE(BlockScope->dominates(FuncScope));
EXPECT_EQ(FuncScope->getParent(), nullptr);
EXPECT_EQ(BlockScope->getParent(), FuncScope);
SmallPtrSet<const MachineBasicBlock *, 4> MBBVec;
LS.getMachineBasicBlocks(OutermostLoc.get(), MBBVec);
EXPECT_EQ(MBBVec.size(), 4u);
for (auto &MBB : *MF) {
EXPECT_EQ(MBBVec.count(&MBB), 1u);
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), &MBB));
EXPECT_TRUE(LS.dominates(InBlockLoc.get(), &MBB));
EXPECT_FALSE(LS.dominates(InlinedLoc.get(), &MBB));
}
}
// Test inlined scopes functionality and relationship with the outer scopes.
TEST_F(LexicalScopesTest, InlinedScopes) {
BuildMI(*MBB1, MBB1->end(), InlinedLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), InlinedLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), InlinedLoc, BeanInst);
BuildMI(*MBB4, MBB4->end(), InlinedLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
auto &Children = FuncScope->getChildren();
ASSERT_EQ(Children.size(), 1u);
auto *BlockScope = Children[0];
auto &BlockChildren = BlockScope->getChildren();
ASSERT_EQ(BlockChildren.size(), 1u);
auto *InlinedScope = BlockChildren[0];
EXPECT_FALSE(InlinedScope->isAbstractScope());
EXPECT_EQ(InlinedScope->getInlinedAt(), InlinedLoc.getInlinedAt());
EXPECT_EQ(InlinedScope->getDesc(), InlinedLoc.getScope());
EXPECT_EQ(InlinedScope->getChildren().size(), 0u);
EXPECT_EQ(FuncScope->getParent(), nullptr);
EXPECT_EQ(BlockScope->getParent(), FuncScope);
EXPECT_EQ(InlinedScope->getParent(), BlockScope);
const auto &AbstractScopes = LS.getAbstractScopesList();
ASSERT_EQ(AbstractScopes.size(), 1u);
const auto &AbstractScope = *AbstractScopes[0];
EXPECT_TRUE(AbstractScope.isAbstractScope());
EXPECT_EQ(AbstractScope.getDesc(), InlinedLoc.getScope());
EXPECT_EQ(AbstractScope.getInlinedAt(), nullptr);
EXPECT_EQ(AbstractScope.getParent(), nullptr);
}
// Test behaviour in a function that has empty DebugLocs.
TEST_F(LexicalScopesTest, FuncWithEmptyGap) {
BuildMI(*MBB1, MBB1->end(), OutermostLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), DebugLoc(), BeanInst);
BuildMI(*MBB3, MBB3->end(), DebugLoc(), BeanInst);
BuildMI(*MBB4, MBB4->end(), OutermostLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
// A gap in a range that contains no other location, is not actually a
// gap as far as lexical scopes are concerned.
auto &Ranges = FuncScope->getRanges();
ASSERT_EQ(Ranges.size(), 1u);
EXPECT_EQ(Ranges[0].first, &*MF->begin()->begin());
auto BBIt = MF->end();
BBIt = std::prev(BBIt);
EXPECT_EQ(Ranges[0].second, &*BBIt->begin());
}
// Now a function with intervening not-in-scope instructions.
TEST_F(LexicalScopesTest, FuncWithRealGap) {
MachineInstr *FirstI = BuildMI(*MBB1, MBB1->end(), InBlockLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), OutermostLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), OutermostLoc, BeanInst);
MachineInstr *LastI = BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
ASSERT_NE(BlockScope, nullptr);
// Within the block scope, there's a gap between the first and last
// block / instruction, where it's only the outermost scope.
auto &Ranges = BlockScope->getRanges();
ASSERT_EQ(Ranges.size(), 2u);
EXPECT_EQ(Ranges[0].first, FirstI);
EXPECT_EQ(Ranges[0].second, FirstI);
EXPECT_EQ(Ranges[1].first, LastI);
EXPECT_EQ(Ranges[1].second, LastI);
// The outer function scope should cover the whole function, including
// blocks the lexicalblock covers.
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
auto &FuncRanges = FuncScope->getRanges();
ASSERT_EQ(FuncRanges.size(), 1u);
EXPECT_NE(FuncRanges[0].first, FuncRanges[0].second);
EXPECT_EQ(FuncRanges[0].first, FirstI);
EXPECT_EQ(FuncRanges[0].second, LastI);
}
// Examine the relationship between two scopes that don't nest (are siblings).
TEST_F(LexicalScopesTest, NotNested) {
MachineInstr *FirstI = BuildMI(*MBB1, MBB1->end(), InBlockLoc, BeanInst);
MachineInstr *SecondI =
BuildMI(*MBB2, MBB2->end(), NotNestedBlockLoc, BeanInst);
MachineInstr *ThirdI =
BuildMI(*MBB3, MBB3->end(), NotNestedBlockLoc, BeanInst);
MachineInstr *FourthI = BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
LexicalScope *OtherBlockScope = LS.findLexicalScope(NotNestedBlockLoc.get());
ASSERT_NE(FuncScope, nullptr);
ASSERT_NE(BlockScope, nullptr);
ASSERT_NE(OtherBlockScope, nullptr);
// The function should cover everything; the two blocks are distinct and
// should not.
auto &FuncRanges = FuncScope->getRanges();
ASSERT_EQ(FuncRanges.size(), 1u);
EXPECT_EQ(FuncRanges[0].first, FirstI);
EXPECT_EQ(FuncRanges[0].second, FourthI);
// Two ranges, start and end instructions.
auto &BlockRanges = BlockScope->getRanges();
ASSERT_EQ(BlockRanges.size(), 2u);
EXPECT_EQ(BlockRanges[0].first, FirstI);
EXPECT_EQ(BlockRanges[0].second, FirstI);
EXPECT_EQ(BlockRanges[1].first, FourthI);
EXPECT_EQ(BlockRanges[1].second, FourthI);
// One inner range, covering the two inner blocks.
auto &OtherBlockRanges = OtherBlockScope->getRanges();
ASSERT_EQ(OtherBlockRanges.size(), 1u);
EXPECT_EQ(OtherBlockRanges[0].first, SecondI);
EXPECT_EQ(OtherBlockRanges[0].second, ThirdI);
}
// Test the scope-specific and block-specific dominates methods.
TEST_F(LexicalScopesTest, TestDominates) {
BuildMI(*MBB1, MBB1->end(), InBlockLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), NotNestedBlockLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), NotNestedBlockLoc, BeanInst);
BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
LexicalScope *OtherBlockScope = LS.findLexicalScope(NotNestedBlockLoc.get());
ASSERT_NE(FuncScope, nullptr);
ASSERT_NE(BlockScope, nullptr);
ASSERT_NE(OtherBlockScope, nullptr);
EXPECT_TRUE(FuncScope->dominates(BlockScope));
EXPECT_TRUE(FuncScope->dominates(OtherBlockScope));
EXPECT_FALSE(BlockScope->dominates(FuncScope));
EXPECT_FALSE(BlockScope->dominates(OtherBlockScope));
EXPECT_FALSE(OtherBlockScope->dominates(FuncScope));
EXPECT_FALSE(OtherBlockScope->dominates(BlockScope));
// Outermost scope dominates everything, as all insts are within it.
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB1));
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB2));
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB3));
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB4));
// One inner block dominates the outer pair of blocks,
EXPECT_TRUE(LS.dominates(InBlockLoc.get(), MBB1));
EXPECT_FALSE(LS.dominates(InBlockLoc.get(), MBB2));
EXPECT_FALSE(LS.dominates(InBlockLoc.get(), MBB3));
EXPECT_TRUE(LS.dominates(InBlockLoc.get(), MBB4));
// While the other dominates the inner two blocks.
EXPECT_FALSE(LS.dominates(NotNestedBlockLoc.get(), MBB1));
EXPECT_TRUE(LS.dominates(NotNestedBlockLoc.get(), MBB2));
EXPECT_TRUE(LS.dominates(NotNestedBlockLoc.get(), MBB3));
EXPECT_FALSE(LS.dominates(NotNestedBlockLoc.get(), MBB4));
}
// Test getMachineBasicBlocks returns all dominated blocks.
TEST_F(LexicalScopesTest, TestGetBlocks) {
BuildMI(*MBB1, MBB1->end(), InBlockLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), NotNestedBlockLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), NotNestedBlockLoc, BeanInst);
BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
LexicalScope *OtherBlockScope = LS.findLexicalScope(NotNestedBlockLoc.get());
ASSERT_NE(FuncScope, nullptr);
ASSERT_NE(BlockScope, nullptr);
ASSERT_NE(OtherBlockScope, nullptr);
SmallPtrSet<const MachineBasicBlock *, 4> OutermostBlocks, InBlockBlocks,
NotNestedBlockBlocks;
LS.getMachineBasicBlocks(OutermostLoc.get(), OutermostBlocks);
LS.getMachineBasicBlocks(InBlockLoc.get(), InBlockBlocks);
LS.getMachineBasicBlocks(NotNestedBlockLoc.get(), NotNestedBlockBlocks);
EXPECT_EQ(OutermostBlocks.count(MBB1), 1u);
EXPECT_EQ(OutermostBlocks.count(MBB2), 1u);
EXPECT_EQ(OutermostBlocks.count(MBB3), 1u);
EXPECT_EQ(OutermostBlocks.count(MBB4), 1u);
EXPECT_EQ(InBlockBlocks.count(MBB1), 1u);
EXPECT_EQ(InBlockBlocks.count(MBB2), 0u);
EXPECT_EQ(InBlockBlocks.count(MBB3), 0u);
EXPECT_EQ(InBlockBlocks.count(MBB4), 1u);
EXPECT_EQ(NotNestedBlockBlocks.count(MBB1), 0u);
EXPECT_EQ(NotNestedBlockBlocks.count(MBB2), 1u);
EXPECT_EQ(NotNestedBlockBlocks.count(MBB3), 1u);
EXPECT_EQ(NotNestedBlockBlocks.count(MBB4), 0u);
}
TEST_F(LexicalScopesTest, TestMetaInst) {
// Instruction Layout looks like this, where 'F' means funcscope, and
// 'B' blockscope:
// bb1:
// F: bean
// B: bean
// bb2:
// F: bean
// B: DBG_VALUE
// bb3:
// F: bean
// B: DBG_VALUE
// bb4:
// F: bean
// B: bean
// The block / 'B' should only dominate bb1 and bb4. DBG_VALUE is a meta
// instruction, and shouldn't contribute to scopes.
BuildMI(*MBB1, MBB1->end(), OutermostLoc, BeanInst);
BuildMI(*MBB1, MBB1->end(), InBlockLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), OutermostLoc, BeanInst);
BuildMI(*MBB2, MBB2->end(), InBlockLoc, DbgValueInst);
BuildMI(*MBB3, MBB3->end(), OutermostLoc, BeanInst);
BuildMI(*MBB3, MBB3->end(), InBlockLoc, DbgValueInst);
BuildMI(*MBB4, MBB4->end(), OutermostLoc, BeanInst);
BuildMI(*MBB4, MBB4->end(), InBlockLoc, BeanInst);
LexicalScopes LS;
LS.initialize(*MF);
LexicalScope *FuncScope = LS.getCurrentFunctionScope();
LexicalScope *BlockScope = LS.findLexicalScope(InBlockLoc.get());
ASSERT_NE(FuncScope, nullptr);
ASSERT_NE(BlockScope, nullptr);
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB1));
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB2));
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB3));
EXPECT_TRUE(LS.dominates(OutermostLoc.get(), MBB4));
EXPECT_TRUE(LS.dominates(InBlockLoc.get(), MBB1));
EXPECT_FALSE(LS.dominates(InBlockLoc.get(), MBB2));
EXPECT_FALSE(LS.dominates(InBlockLoc.get(), MBB3));
EXPECT_TRUE(LS.dominates(InBlockLoc.get(), MBB4));
}
} // anonymous namespace
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