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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227849 91177308-0d34-0410-b5e6-96231b3b80d8
114 lines
3.6 KiB
C++
114 lines
3.6 KiB
C++
//===- DebugInfoMetadata.cpp - Implement debug info metadata --------------===//
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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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//
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// This file implements the debug info Metadata classes.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/IR/DebugInfoMetadata.h"
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#include "LLVMContextImpl.h"
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#include "MetadataImpl.h"
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using namespace llvm;
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MDLocation::MDLocation(LLVMContext &C, StorageType Storage, unsigned Line,
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unsigned Column, ArrayRef<Metadata *> MDs)
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: MDNode(C, MDLocationKind, Storage, MDs) {
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assert((MDs.size() == 1 || MDs.size() == 2) &&
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"Expected a scope and optional inlined-at");
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// Set line and column.
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assert(Line < (1u << 24) && "Expected 24-bit line");
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assert(Column < (1u << 16) && "Expected 16-bit column");
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SubclassData32 = Line;
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SubclassData16 = Column;
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}
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static void adjustLine(unsigned &Line) {
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// Set to unknown on overflow. Still use 24 bits for now.
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if (Line >= (1u << 24))
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Line = 0;
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}
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static void adjustColumn(unsigned &Column) {
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// Set to unknown on overflow. We only have 16 bits to play with here.
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if (Column >= (1u << 16))
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Column = 0;
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}
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MDLocation *MDLocation::getImpl(LLVMContext &Context, unsigned Line,
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unsigned Column, Metadata *Scope,
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Metadata *InlinedAt, StorageType Storage,
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bool ShouldCreate) {
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// Fixup line/column.
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adjustLine(Line);
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adjustColumn(Column);
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if (Storage == Uniqued) {
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if (auto *N =
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getUniqued(Context.pImpl->MDLocations,
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MDLocationInfo::KeyTy(Line, Column, Scope, InlinedAt)))
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return N;
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if (!ShouldCreate)
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return nullptr;
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} else {
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assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
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}
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SmallVector<Metadata *, 2> Ops;
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Ops.push_back(Scope);
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if (InlinedAt)
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Ops.push_back(InlinedAt);
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return storeImpl(new (Ops.size())
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MDLocation(Context, Storage, Line, Column, Ops),
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Storage, Context.pImpl->MDLocations);
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}
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static StringRef getString(const MDString *S) {
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if (S)
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return S->getString();
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return StringRef();
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}
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#ifndef NDEBUG
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static bool isCanonical(const MDString *S) {
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return !S || !S->getString().empty();
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}
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#endif
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GenericDebugNode *GenericDebugNode::getImpl(LLVMContext &Context, unsigned Tag,
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MDString *Header,
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ArrayRef<Metadata *> DwarfOps,
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StorageType Storage,
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bool ShouldCreate) {
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unsigned Hash = 0;
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if (Storage == Uniqued) {
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GenericDebugNodeInfo::KeyTy Key(Tag, getString(Header), DwarfOps);
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if (auto *N = getUniqued(Context.pImpl->GenericDebugNodes, Key))
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return N;
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if (!ShouldCreate)
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return nullptr;
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Hash = Key.getHash();
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} else {
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assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
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}
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// Use a nullptr for empty headers.
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assert(isCanonical(Header) && "Expected canonical MDString");
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Metadata *PreOps[] = {Header};
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return storeImpl(new (DwarfOps.size() + 1) GenericDebugNode(
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Context, Storage, Hash, Tag, PreOps, DwarfOps),
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Storage, Context.pImpl->GenericDebugNodes);
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}
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void GenericDebugNode::recalculateHash() {
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setHash(GenericDebugNodeInfo::KeyTy::calculateHash(this));
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}
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