17204706958

Committed 25 Aug 2025 09:20AM UTC coverage: 72.695% (-10.7%) from 83.355%

Build # 17204706958

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Pull #45

github

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web-flow

Commit Message

Merge 047c32aa1 into c60847ea6

Pull Request Pull Request #45: Disable TBAA for all cases

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Branch coverage included in aggregate %.

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82.09

/lib/type/GEP.cpp

//  llvm-dimeta library
//  Copyright (c) 2022-2025 llvm-dimeta authors
//  Distributed under the BSD 3-Clause license.
//  (See accompanying file LICENSE)
//  SPDX-License-Identifier: BSD-3-Clause
//

#include "GEP.h"

#include "DIUtil.h"
#include "support/Logger.h"

#include "llvm/ADT/APInt.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DebugInfoMetadata.h"
#include "llvm/IR/Metadata.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/Use.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"

#include <algorithm>
#include <cassert>
#include <cstddef>
#include <cstdint>
#include <iterator>
#include <llvm/IR/Instruction.h>
#include <llvm/IR/Instructions.h>
#include <optional>

namespace dimeta::gep {

namespace util {
inline bool is_byte_indexing(const llvm::GEPOperator* gep) {
  return gep->getSourceElementType()->isIntegerTy(8);
}

inline bool is_first_non_zero_indexing(const llvm::GEPOperator* gep) {
  if (auto* const_idx = llvm::dyn_cast<llvm::ConstantInt>((*gep->idx_begin()).get())) {
    const int64_t index = const_idx->getValue().getSExtValue();
    return index > 0;
  }
  return false;
}
}  // namespace util

struct GepIndices {
  const llvm::GEPOperator* gep;
  llvm::SmallVector<uint64_t, 4> indices_;
  bool skipped{false};
  bool is_byte_access{false};
  using Iter = llvm::SmallVector<uint64_t, 4>::const_iterator;

  llvm::iterator_range<Iter> indices() const {
    return llvm::iterator_range<Iter>(indices_);
  }

  size_t size() const {
    return indices_.size();
  }

  bool empty() const {
    return size() == 0;
  }

  bool skipped_first() const {
    return skipped;
  }

  bool byte_access() const {
    return is_byte_access;
  }

  static GepIndices create(const llvm::GEPOperator* inst, bool skip_first = true);
};

GepIndices GepIndices::create(const llvm::GEPOperator* inst, bool skip_first) {
  GepIndices gep_ind;
  gep_ind.gep            = inst;
  gep_ind.skipped        = skip_first;
  gep_ind.is_byte_access = util::is_byte_indexing(gep_ind.gep);

  bool use_zero{true};

#if LLVM_VERSION_MAJOR > 12
  for (const auto& index : inst->indices()) {
#else
  for (const auto& index : llvm::make_range(inst->idx_begin(), inst->idx_end())) {
#endif
    LOG_DEBUG("Iter " << skip_first << " with " << *index.get())
    if (skip_first) {
      skip_first = false;
      continue;
    }
    if (auto* const_idx = llvm::dyn_cast<llvm::ConstantInt>(index.get())) {
      const int64_t index_ = const_idx->getValue().getSExtValue();
      gep_ind.indices_.emplace_back(index_);
    }
  }

  if (!inst->indices().empty() && gep_ind.empty()) {
    // based on heap_milc_mrecv_mock.c with optim:
    // gep_ind.indices_.push_back(0);
  }

  return gep_ind;
}

inline llvm::raw_ostream& operator<<(llvm::raw_ostream& os, const GepIndices& indices) {
  const auto& vec = indices.indices_;
  if (vec.empty()) {
    os << "[]";
    return os;
  }
  const auto* begin = std::begin(vec);
  os << "[" << *begin;
  std::for_each(std::next(begin), std::end(vec), [&](const auto value) {
    os << ", ";
    os << value;
  });
  os << "]";
  return os;
}

namespace detail {

llvm::DINode* select_non_zero_element(llvm::DINode* element, llvm::DINode* next_element) {
  // used to detect the empty base class optimization
  auto* derived_type_member      = llvm::dyn_cast<llvm::DIDerivedType>(element);
  auto* next_derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(next_element);
  if (derived_type_member != nullptr && next_derived_type_member != nullptr) {
    LOG_DEBUG("Non-null elements")
    if (derived_type_member->getOffsetInBits() == next_derived_type_member->getOffsetInBits()) {
      LOG_DEBUG("Same offset detected: " << log::ditype_str(derived_type_member) << " and "
                                         << log::ditype_str(next_derived_type_member))
      return next_element;
    }
  }
  return element;
}

template <typename UnlessFn>
auto find_non_derived_type_unless(llvm::DIType* root, UnlessFn&& unless) {
  llvm::DIType* type = root;
  while (type && llvm::isa<llvm::DIDerivedType>(type)) {
    if (unless(type)) {
      break;
    }
    auto* ditype = llvm::dyn_cast<llvm::DIDerivedType>(type);
    type         = ditype->getBaseType();
  }
  return type;
}

inline bool is_ebo_inherited_composite(llvm::DINode* dinode) {
  if (auto* derived = llvm::dyn_cast<llvm::DIDerivedType>(dinode)) {
    if (derived->getTag() != llvm::dwarf::DW_TAG_inheritance) {
      return false;
    }

    LOG_DEBUG(log::ditype_str(derived))
    auto* base = llvm::dyn_cast<llvm::DICompositeType>(derived->getBaseType());
    if (!base) {
      LOG_DEBUG("Is not a composite inheritance " << log::ditype_str(derived))
      return false;
    }
    const bool has_sized_member =
        llvm::any_of(base->getElements(), [](llvm::DINode* elem) { return di::util::is_non_static_member(*elem); });
    LOG_DEBUG("Has sized mem " << has_sized_member)
    return !has_sized_member;
  }

  return false;
}

}  // namespace detail

auto find_non_derived_type_unless_ptr(llvm::DIType* root) {
  return detail::find_non_derived_type_unless(root, [](auto* val) { return di::util::is_pointer_like(*val); });
}

auto find_non_derived_type(llvm::DIType* root) {
  return detail::find_non_derived_type_unless(root, [](auto*) { return false; });
}

llvm::DICompositeType* skip_first_gep_access(llvm::DICompositeType* composite_type) {
  using namespace detail;
  const auto select_next_member = [&](llvm::DICompositeType* base) -> std::optional<llvm::DIType*> {
    auto composite_elements = base->getElements();
    auto* element           = composite_elements[0];
    if (composite_elements.size() > 1) {
      auto* next_element = composite_elements[1];
      element            = detail::select_non_zero_element(element, next_element);
    }

    return find_non_derived_type_unless_ptr(llvm::dyn_cast<llvm::DIType>(element));
  };

  const auto should_iterate_next_member = [&](auto* composite_type) {
    const auto count_members = llvm::count_if(composite_type->getElements(),
                                              [](const auto* elem) { return di::util::is_non_static_member(*elem); });
    return count_members == 1;
  };

  while (should_iterate_next_member(composite_type)) {
    auto next_di = select_next_member(composite_type);
    if (!next_di || !llvm::isa<llvm::DICompositeType>(next_di.value())) {
      LOG_DEBUG("Did not find next member")
      break;
    }
    composite_type = llvm::dyn_cast<llvm::DICompositeType>(next_di.value());
    LOG_DEBUG("Found next " << log::ditype_str(composite_type))
  }

  return composite_type;
}

GepIndexToType iterate_gep_index(llvm::DICompositeType* composite_type, const GepIndices& gep_indices) {
  const auto has_next_gep_idx = [&gep_indices](size_t pos) { return pos + 1 < gep_indices.size(); };

  LOG_DEBUG("Iterate over gep: " << gep_indices);

  const auto is_static_member = [](const llvm::DINode* node) {
    if (const auto* derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(node)) {
      return derived_type_member->isStaticMember();
    }
    return false;
  };

  for (const auto& enum_index : llvm::enumerate(gep_indices.indices())) {
    auto gep_index       = enum_index.value();
    const auto& elements = composite_type->getElements();
    assert(elements.size() > gep_index);

    auto* element = elements[gep_index];

    if (gep_index == 0 && elements.size() > 1) {
      // e.g., LLVM-14: cpp/heap_lhs_function_opt.cpp: vector gep is [0 0 0 0 ...] -> never recurse into EBO
      LOG_DEBUG("Check zero-size pattern for " << log::ditype_str(composite_type))
      auto* next_element = elements[1];
      element            = detail::select_non_zero_element(element, next_element);
    }

    const auto ebo_inheritance_offset = llvm::count_if(
        composite_type->getElements(), [&](auto* dinode) { return detail::is_ebo_inherited_composite(dinode); });

    if (gep_index > 0 && ebo_inheritance_offset > 0 && (gep_index) < elements.size()) {
      LOG_DEBUG("EBO offset needed " << ebo_inheritance_offset)
      gep_index += ebo_inheritance_offset;
      element = elements[gep_index];
    }

    if (!llvm::isa<llvm::DIDerivedType>(element)) {
      LOG_DEBUG("Index shows to non-derived type: " << log::ditype_str(element))
      // TODO, if only one index, and this triggers, go first element all the way down?
      // maybe also check for class type (not structs etc.)
    }

    while (gep_index < elements.size() && is_static_member(element)) {
      LOG_DEBUG("Skipping static member of composite " << log::ditype_str(element))
      element = elements[++gep_index];
    }

    LOG_DEBUG(" element[" << gep_index << "]: " << log::ditype_str(element))

    if (auto* derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(element)) {
      auto* member_type = find_non_derived_type_unless_ptr(derived_type_member->getBaseType());

      LOG_DEBUG("Looking at " << log::ditype_str(member_type))

      if (auto* composite_member_type = llvm::dyn_cast<llvm::DICompositeType>(member_type)) {
        if (composite_member_type->getTag() == llvm::dwarf::DW_TAG_class_type ||
            composite_member_type->getTag() == llvm::dwarf::DW_TAG_structure_type) {
          // maybe need to recurse into!
          if (has_next_gep_idx(enum_index.index())) {
            composite_type = composite_member_type;
            continue;
          }
        }
        if (composite_member_type->getTag() == llvm::dwarf::DW_TAG_array_type) {
          if (has_next_gep_idx(enum_index.index())) {
            LOG_DEBUG("Found array that is indexed with next index")
            // At end of gep instruction, return basetype:
            return GepIndexToType{
                composite_member_type->getBaseType(),
                derived_type_member,
            };
          }
          // maybe need to recurse into tag_array_type (of non-basic type...)
        }
      }

      return GepIndexToType{member_type, derived_type_member};
    }
  }
  return {};
}

GepIndexToType resolve_gep_index_to_type(llvm::DICompositeType* composite_type, const GepIndices& gep_indices) {
  if (gep_indices.empty()) {
    // this triggers for composite (-array) access without constant index, see "heap_milc_struct_mock.c":
    LOG_DEBUG("Gep indices empty")
    return GepIndexToType{composite_type};
  }

  if (gep_indices.byte_access()) {
    LOG_DEBUG("Trying to resolve byte access based on offset " << gep_indices.indices_[0])
    auto result = di::util::resolve_byte_offset_to_member_of(composite_type, gep_indices.indices_[0]);
    if (result) {
      return GepIndexToType{result->type_of_member, result->member};
    }
    return GepIndexToType{composite_type};
  }

  if (gep_indices.skipped_first() && gep_indices.indices_[0] != 0) {
    // This assumes that a single (and only single) first 0 skips through to the first element with more than one
    // member: struct A { struct B { struct C { int, int } } } -> would skip to "struct C" for gep [0 1]
    // see test gep/global_nested.c
    LOG_DEBUG("Skip single member nested of: " << log::ditype_str(composite_type))
    auto* new_composite_type = skip_first_gep_access(composite_type);
    if (new_composite_type != composite_type) {
      // required for
      // - LLVM-18: gep/global_nested & gep/param_first_nested_padding.cpp
      // - LLVM-19: gep/global_nested.c
      composite_type = new_composite_type;
      LOG_DEBUG("Result of skip: " << log::ditype_str(composite_type))
    }
  }

  return iterate_gep_index(composite_type, gep_indices);
}

std::optional<llvm::DebugLoc> try_resolve_inlined_debug_loc(const llvm::GEPOperator* gep) {
  auto gep_ptr = llvm::dyn_cast<llvm::Instruction>(gep);

  if (!gep_ptr) {
    gep_ptr = llvm::dyn_cast<llvm::Instruction>(gep->getPointerOperand());
    if (!gep_ptr) {
      LOG_DEBUG("No load for GEP found")
      return {};
    }
  }

  if (!gep_ptr->getDebugLoc()) {
    return {};
  }
  const bool is_inlined = gep_ptr->getDebugLoc()->getInlinedAt() != nullptr;
  if (!is_inlined) {
    LOG_DEBUG("GEP not inlined")
    return {};
  }
  return gep_ptr->getDebugLoc();
}

std::optional<GepIndexToType> try_resolve_inlined_operator(const llvm::GEPOperator* gep) {
  auto debug_loc = try_resolve_inlined_debug_loc(gep);

  if (!debug_loc) {
    return {};
  }

  const auto* const sub_prog = llvm::dyn_cast<llvm::DISubprogram>(debug_loc->getScope());
  assert(sub_prog && "Scope does not represent a subprogram");

  LOG_DEBUG("Looking at " << log::ditype_str(sub_prog))

  // see cpp/heap_vector_operator.cpp: vector::operator[] returns a reference, that we skip here:
  const auto remove_ref = [&](auto* di_type) {
    auto node = detail::find_non_derived_type_unless(di_type, [](auto* node) {
      if (const auto* type = llvm::dyn_cast<llvm::DIDerivedType>(node)) {
        return type->getTag() == llvm::dwarf::DW_TAG_pointer_type ||
               type->getTag() == llvm::dwarf::DW_TAG_ptr_to_member_type;
      }
      return false;
    });
    return node;
  };

  if (auto* sub_program_type = sub_prog->getType()) {
    // Has return type (not void)?
    if (sub_program_type->getTypeArray().size() > 0 && (*sub_program_type->getTypeArray().begin() != nullptr)) {
      auto* result = remove_ref(*sub_program_type->getTypeArray().begin());
      LOG_DEBUG("Found candidate " << log::ditype_str(*sub_program_type->getTypeArray().begin()) << " with final type "
                                   << log::ditype_str(result))
      return {GepIndexToType{result}};
    }
  }

  LOG_DEBUG("Could not detect inlined operator")
  return {};
}

GepIndexToType extract_gep_dereferenced_type(llvm::DIType* root, const llvm::GEPOperator& inst) {
  using namespace llvm;

  auto* const gep_src = inst.getSourceElementType();

  auto* const base_ty        = find_non_derived_type(root);
  auto* const composite_type = llvm::dyn_cast_or_null<DICompositeType>(base_ty);
  // see test cpp/heap_vector_opt.cpp: GEP on pointer (of inlined operator[])
  const bool may_be_inlined_operator = (composite_type != nullptr) && composite_type->isForwardDecl();

  auto debug_loc = try_resolve_inlined_operator(&inst);
  if (debug_loc) {
    return debug_loc.value();
  }

  if (gep_src->isPointerTy() && !may_be_inlined_operator) {
    LOG_DEBUG("Gep to ptr " << log::ditype_str(root));
    return GepIndexToType{root};
  }

  if (gep_src->isArrayTy()) {
    if (composite_type != nullptr) {
      auto* base_type = composite_type->getBaseType();
      LOG_DEBUG("Gep to array of DI composite, with base type " << log::ditype_str(base_type));
      if (composite_type->getTag() == llvm::dwarf::DW_TAG_array_type) {
        // return GepIndexToType{base_type};
      }
    }
    LOG_DEBUG("Gep to array " << log::ditype_str(root));
    return GepIndexToType{root};
  }

  auto* const derived_root = llvm::dyn_cast<DIDerivedType>(root);
  const bool is_pointer_target =
      (derived_root != nullptr) && derived_root->getBaseType()->getTag() == dwarf::DW_TAG_pointer_type;
  // TODO: This check seems like a bad idea but I'm not really sure how to do it properly, I reckon we need *some*
  //       heuristic to detect "fake-array" types though (e.g. gep/array_composite_s.c)
  if (util::is_byte_indexing(&inst) && (!composite_type || is_pointer_target)) {
    LOG_DEBUG("Gep with byte offset to pointer-like : " << log::ditype_str(root))
    return GepIndexToType{root};
  }

  assert(composite_type != nullptr && "Root should be a struct-like type.");

  if (composite_type->isForwardDecl()) {
    LOG_DEBUG("Trying to resolve forward-declared composite type " << log::ditype_str(composite_type))
    return try_resolve_inlined_operator(&inst).value_or(GepIndexToType{root});
  }

  LOG_DEBUG("Gep to DI composite: " << log::ditype_str(composite_type))
  bool skip_first{!util::is_first_non_zero_indexing(&inst)};
  if (util::is_byte_indexing(&inst)) {
    LOG_DEBUG("Access based on i8 ptr, assuming byte offsetting into composite member")
    skip_first = false;  // We do not skip over byte index values (likely != 0)
  }

  auto accessed_ditype = resolve_gep_index_to_type(composite_type, GepIndices::create(&inst, skip_first));

  return accessed_ditype;
}

}  // namespace dimeta::gep

1	// llvm-dimeta library
2	// Copyright (c) 2022-2025 llvm-dimeta authors
3	// Distributed under the BSD 3-Clause license.
4	// (See accompanying file LICENSE)
5	// SPDX-License-Identifier: BSD-3-Clause
6	//
7
8	#include "GEP.h"
9
10	#include "DIUtil.h"
11	#include "support/Logger.h"
12
13	#include "llvm/ADT/APInt.h"
14	#include "llvm/ADT/STLExtras.h"
15	#include "llvm/ADT/SmallVector.h"
16	#include "llvm/ADT/iterator_range.h"
17	#include "llvm/BinaryFormat/Dwarf.h"
18	#include "llvm/IR/Constants.h"
19	#include "llvm/IR/DebugInfoMetadata.h"
20	#include "llvm/IR/Metadata.h"
21	#include "llvm/IR/Operator.h"
22	#include "llvm/IR/Type.h"
23	#include "llvm/IR/Use.h"	286✔
24	#include "llvm/Support/Casting.h"
25	#include "llvm/Support/Debug.h"
26	#include "llvm/Support/raw_ostream.h"
27
28	#include <algorithm>
29	#include <cassert>
30	#include <cstddef>
31	#include <cstdint>
32	#include <iterator>
33	#include <llvm/IR/Instruction.h>
34	#include <llvm/IR/Instructions.h>
35	#include <optional>
36
37	namespace dimeta::gep {
38
39	namespace util {
40	inline bool is_byte_indexing(const llvm::GEPOperator* gep) {	4,522✔
41	return gep->getSourceElementType()->isIntegerTy(8);	4,522✔
42	}
43
44	inline bool is_first_non_zero_indexing(const llvm::GEPOperator* gep) {	1,490✔
45	if (auto* const_idx = llvm::dyn_cast<llvm::ConstantInt>((*gep->idx_begin()).get())) {	2,854!
46	const int64_t index = const_idx->getValue().getSExtValue();	1,364✔
47	return index > 0;	1,364✔
48	}	1,364✔
49	return false;	126✔
50	}	1,490✔
51	} // namespace util
52
53	struct GepIndices {	1,490✔
54	const llvm::GEPOperator* gep;
55	llvm::SmallVector<uint64_t, 4> indices_;
56	bool skipped{false};	1,490✔
57	bool is_byte_access{false};	1,490✔
58	using Iter = llvm::SmallVector<uint64_t, 4>::const_iterator;
59
60	llvm::iterator_range<Iter> indices() const {	1,170✔
61	return llvm::iterator_range<Iter>(indices_);	1,170✔
62	}
63
64	size_t size() const {	3,672✔
65	return indices_.size();	3,672✔
66	}
67
68	bool empty() const {	2,980✔
69	return size() == 0;	2,980✔
70	}
71
72	bool skipped_first() const {	1,170✔
73	return skipped;	1,170✔
74	}
75
76	bool byte_access() const {	1,390✔
77	return is_byte_access;	1,390✔
78	}
79
80	static GepIndices create(const llvm::GEPOperator* inst, bool skip_first = true);
81	};
82
83	GepIndices GepIndices::create(const llvm::GEPOperator* inst, bool skip_first) {	1,490✔
84	GepIndices gep_ind;	1,490✔
85	gep_ind.gep = inst;	1,490✔
86	gep_ind.skipped = skip_first;	1,490✔
87	gep_ind.is_byte_access = util::is_byte_indexing(gep_ind.gep);	1,490!
88
89	bool use_zero{true};	1,490✔
90
91	#if LLVM_VERSION_MAJOR > 12
92	for (const auto& index : inst->indices()) {	4,452!
93	#else
94	for (const auto& index : llvm::make_range(inst->idx_begin(), inst->idx_end())) {
95	#endif
96	LOG_DEBUG("Iter " << skip_first << " with " << *index.get())
97	if (skip_first) {	2,962✔
98	skip_first = false;	1,252✔
99	continue;	1,252✔
100	}
101	if (auto* const_idx = llvm::dyn_cast<llvm::ConstantInt>(index.get())) {	3,402!
102	const int64_t index_ = const_idx->getValue().getSExtValue();	1,692!
103	gep_ind.indices_.emplace_back(index_);	1,692!
104	}	1,692✔
105	}	2,962!
106
107	if (!inst->indices().empty() && gep_ind.empty()) {	2,980!
108	// based on heap_milc_mrecv_mock.c with optim:
109	// gep_ind.indices_.push_back(0);
110	}	100✔
111
112	return gep_ind;	1,490✔
113	}	1,490!
114
115	inline llvm::raw_ostream& operator<<(llvm::raw_ostream& os, const GepIndices& indices) {
116	const auto& vec = indices.indices_;
117	if (vec.empty()) {
118	os << "[]";
119	return os;
120	}
121	const auto* begin = std::begin(vec);
122	os << "[" << *begin;
123	std::for_each(std::next(begin), std::end(vec), [&](const auto value) {
124	os << ", ";
125	os << value;
126	});
127	os << "]";
128	return os;
129	}
130
131	namespace detail {
132
133	llvm::DINode* select_non_zero_element(llvm::DINode* element, llvm::DINode* next_element) {	174✔
134	// used to detect the empty base class optimization
135	auto* derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(element);	174✔
136	auto* next_derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(next_element);	174✔
137	if (derived_type_member != nullptr && next_derived_type_member != nullptr) {	174!
138	LOG_DEBUG("Non-null elements")
139	if (derived_type_member->getOffsetInBits() == next_derived_type_member->getOffsetInBits()) {	174✔
140	LOG_DEBUG("Same offset detected: " << log::ditype_str(derived_type_member) << " and "
141	<< log::ditype_str(next_derived_type_member))
142	return next_element;	54✔
143	}
144	}	120✔
145	return element;	120✔
146	}	174✔
147
148	template <typename UnlessFn>
149	auto find_non_derived_type_unless(llvm::DIType* root, UnlessFn&& unless) {	3,752✔
150	llvm::DIType* type = root;	3,752✔
151	while (type && llvm::isa<llvm::DIDerivedType>(type)) {	7,113!
152	if (unless(type)) {	4,061!
153	break;	700✔
154	}
155	auto* ditype = llvm::dyn_cast<llvm::DIDerivedType>(type);	3,361✔
156	type = ditype->getBaseType();	3,361✔
157	}	3,361✔
158	return type;	7,504✔
159	}	3,752✔
160
161	inline bool is_ebo_inherited_composite(llvm::DINode* dinode) {	4,102✔
162	if (auto* derived = llvm::dyn_cast<llvm::DIDerivedType>(dinode)) {	8,142!
163	if (derived->getTag() != llvm::dwarf::DW_TAG_inheritance) {	4,040✔
164	return false;	3,778✔
165	}
166
167	LOG_DEBUG(log::ditype_str(derived))
168	auto* base = llvm::dyn_cast<llvm::DICompositeType>(derived->getBaseType());	262✔
169	if (!base) {	262!
170	LOG_DEBUG("Is not a composite inheritance " << log::ditype_str(derived))
UNCOV 171	return false;	×
172	}
173	const bool has_sized_member =	524✔
174	llvm::any_of(base->getElements(), [](llvm::DINode* elem) { return di::util::is_non_static_member(*elem); });	750✔
175	LOG_DEBUG("Has sized mem " << has_sized_member)
176	return !has_sized_member;	262✔
177	}	262✔
178
179	return false;	62✔
180	}	4,102✔
181
182	} // namespace detail
183
184	auto find_non_derived_type_unless_ptr(llvm::DIType* root) {	1,412✔
185	return detail::find_non_derived_type_unless(root, [](auto* val) { return di::util::is_pointer_like(*val); });	2,060✔
186	}
187
188	auto find_non_derived_type(llvm::DIType* root) {	2,244✔
189	return detail::find_non_derived_type_unless(root, [](auto*) { return false; });	5,371✔
190	}
191
192	llvm::DICompositeType* skip_first_gep_access(llvm::DICompositeType* composite_type) {	680✔
193	using namespace detail;
194	const auto select_next_member = [&](llvm::DICompositeType* base) -> std::optional<llvm::DIType*> {	724✔
195	auto composite_elements = base->getElements();	44✔
196	auto* element = composite_elements[0];	44✔
197	if (composite_elements.size() > 1) {	44!
198	auto* next_element = composite_elements[1];	×
199	element = detail::select_non_zero_element(element, next_element);	×
200	}	×
201
202	return find_non_derived_type_unless_ptr(llvm::dyn_cast<llvm::DIType>(element));	44✔
203	};	44✔
204
205	const auto should_iterate_next_member = [&](auto* composite_type) {	1,404✔
206	const auto count_members = llvm::count_if(composite_type->getElements(),	724✔
207	[](const auto* elem) { return di::util::is_non_static_member(*elem); });	2,486✔
208	return count_members == 1;	1,448✔
209	};	724✔
210
211	while (should_iterate_next_member(composite_type)) {	724✔
212	auto next_di = select_next_member(composite_type);	44✔
213	if (!next_di \|\| !llvm::isa<llvm::DICompositeType>(next_di.value())) {	44!
214	LOG_DEBUG("Did not find next member")
215	break;	×
216	}
217	composite_type = llvm::dyn_cast<llvm::DICompositeType>(next_di.value());	44✔
218	LOG_DEBUG("Found next " << log::ditype_str(composite_type))
219	}	44!
220
221	return composite_type;	1,360✔
222	}	680✔
223
224	GepIndexToType iterate_gep_index(llvm::DICompositeType* composite_type, const GepIndices& gep_indices) {	1,170✔
225	const auto has_next_gep_idx = [&gep_indices](size_t pos) { return pos + 1 < gep_indices.size(); };	1,862✔
226
227	LOG_DEBUG("Iterate over gep: " << gep_indices);
228
229	const auto is_static_member = [](const llvm::DINode* node) {	2,646✔
230	if (const auto* derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(node)) {	2,952!
231	return derived_type_member->isStaticMember();	1,476✔
232	}
233	return false;	×
234	};	1,476✔
235
236	for (const auto& enum_index : llvm::enumerate(gep_indices.indices())) {	2,538!
237	auto gep_index = enum_index.value();	1,368✔
238	const auto& elements = composite_type->getElements();	1,368✔
239	assert(elements.size() > gep_index);	1,368!
240
241	auto* element = elements[gep_index];	1,368✔
242
243	if (gep_index == 0 && elements.size() > 1) {	1,368✔
244	// e.g., LLVM-14: cpp/heap_lhs_function_opt.cpp: vector gep is [0 0 0 0 ...] -> never recurse into EBO
245	LOG_DEBUG("Check zero-size pattern for " << log::ditype_str(composite_type))
246	auto* next_element = elements[1];	174✔
247	element = detail::select_non_zero_element(element, next_element);	174✔
248	}	174✔
249
250	const auto ebo_inheritance_offset = llvm::count_if(	2,736✔
251	composite_type->getElements(), [&](auto* dinode) { return detail::is_ebo_inherited_composite(dinode); });	5,470✔
252
253	if (gep_index > 0 && ebo_inheritance_offset > 0 && (gep_index) < elements.size()) {	1,368!
254	LOG_DEBUG("EBO offset needed " << ebo_inheritance_offset)
255	gep_index += ebo_inheritance_offset;	68✔
256	element = elements[gep_index];	68✔
257	}	68✔
258
259	if (!llvm::isa<llvm::DIDerivedType>(element)) {	1,368!
260	LOG_DEBUG("Index shows to non-derived type: " << log::ditype_str(element))
261	// TODO, if only one index, and this triggers, go first element all the way down?
262	// maybe also check for class type (not structs etc.)
263	}	×
264
265	while (gep_index < elements.size() && is_static_member(element)) {	1,476!
266	LOG_DEBUG("Skipping static member of composite " << log::ditype_str(element))
267	element = elements[++gep_index];	108✔
268	}
269
270	LOG_DEBUG(" element[" << gep_index << "]: " << log::ditype_str(element))
271
272	if (auto* derived_type_member = llvm::dyn_cast<llvm::DIDerivedType>(element)) {	2,736!
273	auto* member_type = find_non_derived_type_unless_ptr(derived_type_member->getBaseType());	1,368✔
274
275	LOG_DEBUG("Looking at " << log::ditype_str(member_type))
276
277	if (auto* composite_member_type = llvm::dyn_cast<llvm::DICompositeType>(member_type)) {	2,060✔
278	if (composite_member_type->getTag() == llvm::dwarf::DW_TAG_class_type \|\|	692!
279	composite_member_type->getTag() == llvm::dwarf::DW_TAG_structure_type) {	692✔
280	// maybe need to recurse into!
281	if (has_next_gep_idx(enum_index.index())) {	400✔
282	composite_type = composite_member_type;	198✔
283	continue;	198✔
284	}
285	}	202✔
286	if (composite_member_type->getTag() == llvm::dwarf::DW_TAG_array_type) {	494✔
287	if (has_next_gep_idx(enum_index.index())) {	292✔
288	LOG_DEBUG("Found array that is indexed with next index")
289	// At end of gep instruction, return basetype:
290	return GepIndexToType{	312✔
291	composite_member_type->getBaseType(),	104✔
292	derived_type_member,	104✔
293	};
294	}
295	// maybe need to recurse into tag_array_type (of non-basic type...)
296	}	188✔
297	}	390✔
298
299	return GepIndexToType{member_type, derived_type_member};	1,066✔
300	}	1,368✔
301	}	1,368!
302	return {};	×
303	}	450✔
304
305	GepIndexToType resolve_gep_index_to_type(llvm::DICompositeType* composite_type, const GepIndices& gep_indices) {	1,490✔
306	if (gep_indices.empty()) {	1,490✔
307	// this triggers for composite (-array) access without constant index, see "heap_milc_struct_mock.c":
308	LOG_DEBUG("Gep indices empty")
309	return GepIndexToType{composite_type};	200✔
310	}
311
312	if (gep_indices.byte_access()) {	1,390✔
313	LOG_DEBUG("Trying to resolve byte access based on offset " << gep_indices.indices_[0])
314	auto result = di::util::resolve_byte_offset_to_member_of(composite_type, gep_indices.indices_[0]);	220✔
315	if (result) {	220✔
316	return GepIndexToType{result->type_of_member, result->member};	184✔
317	}
318	return GepIndexToType{composite_type};	72✔
319	}	220✔
320
321	if (gep_indices.skipped_first() && gep_indices.indices_[0] != 0) {	1,170!
322	// This assumes that a single (and only single) first 0 skips through to the first element with more than one
323	// member: struct A { struct B { struct C { int, int } } } -> would skip to "struct C" for gep [0 1]
324	// see test gep/global_nested.c
325	LOG_DEBUG("Skip single member nested of: " << log::ditype_str(composite_type))
326	auto* new_composite_type = skip_first_gep_access(composite_type);	680✔
327	if (new_composite_type != composite_type) {	680✔
328	// required for
329	// - LLVM-18: gep/global_nested & gep/param_first_nested_padding.cpp
330	// - LLVM-19: gep/global_nested.c
331	composite_type = new_composite_type;	38✔
332	LOG_DEBUG("Result of skip: " << log::ditype_str(composite_type))
333	}	38✔
334	}	680✔
335
336	return iterate_gep_index(composite_type, gep_indices);	1,170✔
337	}	1,490✔
338
339	std::optional<llvm::DebugLoc> try_resolve_inlined_debug_loc(const llvm::GEPOperator* gep) {	2,280✔
340	auto gep_ptr = llvm::dyn_cast<llvm::Instruction>(gep);	2,280✔
341
342	if (!gep_ptr) {	2,280✔
343	gep_ptr = llvm::dyn_cast<llvm::Instruction>(gep->getPointerOperand());	96✔
344	if (!gep_ptr) {	96!
345	LOG_DEBUG("No load for GEP found")
346	return {};	96✔
347	}
NEW 348	}	×
349
350	if (!gep_ptr->getDebugLoc()) {	2,184✔
351	return {};	20✔
352	}
353	const bool is_inlined = gep_ptr->getDebugLoc()->getInlinedAt() != nullptr;	2,164✔
354	if (!is_inlined) {	2,164✔
355	LOG_DEBUG("GEP not inlined")
356	return {};	2,068✔
357	}
358	return gep_ptr->getDebugLoc();	96✔
359	}	2,280✔
360
361	std::optional<GepIndexToType> try_resolve_inlined_operator(const llvm::GEPOperator* gep) {	2,280✔
362	auto debug_loc = try_resolve_inlined_debug_loc(gep);	2,280✔
363
364	if (!debug_loc) {	2,280✔
365	return {};	2,184✔
366	}
367
368	const auto* const sub_prog = llvm::dyn_cast<llvm::DISubprogram>(debug_loc->getScope());	96!
369	assert(sub_prog && "Scope does not represent a subprogram");	192!
370
371	LOG_DEBUG("Looking at " << log::ditype_str(sub_prog))
372
373	// see cpp/heap_vector_operator.cpp: vector::operator[] returns a reference, that we skip here:
374	const auto remove_ref = [&](auto* di_type) {	192✔
375	auto node = detail::find_non_derived_type_unless(di_type, [](auto* node) {	382✔
376	if (const auto* type = llvm::dyn_cast<llvm::DIDerivedType>(node)) {	572!
377	return type->getTag() == llvm::dwarf::DW_TAG_pointer_type \|\|	286✔
378	type->getTag() == llvm::dwarf::DW_TAG_ptr_to_member_type;	190✔
379	}
380	return false;	×
381	});	286✔
382	return node;	192✔
383	};	96✔
384
385	if (auto* sub_program_type = sub_prog->getType()) {	192!
386	// Has return type (not void)?
387	if (sub_program_type->getTypeArray().size() > 0 && (*sub_program_type->getTypeArray().begin() != nullptr)) {	96!
388	auto* result = remove_ref(*sub_program_type->getTypeArray().begin());	96!
389	LOG_DEBUG("Found candidate " << log::ditype_str(*sub_program_type->getTypeArray().begin()) << " with final type "
390	<< log::ditype_str(result))
391	return {GepIndexToType{result}};	192✔
392	}	96✔
393	}	×
394
395	LOG_DEBUG("Could not detect inlined operator")
396	return {};	×
397	}	2,280✔
398
399	GepIndexToType extract_gep_dereferenced_type(llvm::DIType* root, const llvm::GEPOperator& inst) {	2,244✔
400	using namespace llvm;
401
402	auto* const gep_src = inst.getSourceElementType();	2,244✔
403
404	auto* const base_ty = find_non_derived_type(root);	2,244✔
405	auto* const composite_type = llvm::dyn_cast_or_null<DICompositeType>(base_ty);	2,244✔
406	// see test cpp/heap_vector_opt.cpp: GEP on pointer (of inlined operator[])
407	const bool may_be_inlined_operator = (composite_type != nullptr) && composite_type->isForwardDecl();	2,244✔
408
409	auto debug_loc = try_resolve_inlined_operator(&inst);	2,244✔
410	if (debug_loc) {	2,244✔
411	return debug_loc.value();	96✔
412	}
413
414	if (gep_src->isPointerTy() && !may_be_inlined_operator) {	2,148!
415	LOG_DEBUG("Gep to ptr " << log::ditype_str(root));
416	return GepIndexToType{root};	776✔
417	}
418
419	if (gep_src->isArrayTy()) {	1,760✔
420	if (composite_type != nullptr) {	218!
421	auto* base_type = composite_type->getBaseType();	218✔
422	LOG_DEBUG("Gep to array of DI composite, with base type " << log::ditype_str(base_type));
423	if (composite_type->getTag() == llvm::dwarf::DW_TAG_array_type) {	218!
424	// return GepIndexToType{base_type};
425	}	218✔
426	}	218✔
427	LOG_DEBUG("Gep to array " << log::ditype_str(root));
428	return GepIndexToType{root};	436✔
429	}
430
431	auto* const derived_root = llvm::dyn_cast<DIDerivedType>(root);	1,542✔
432	const bool is_pointer_target =	2,868✔
433	(derived_root != nullptr) && derived_root->getBaseType()->getTag() == dwarf::DW_TAG_pointer_type;	1,542✔
434	// TODO: This check seems like a bad idea but I'm not really sure how to do it properly, I reckon we need some
435	// heuristic to detect "fake-array" types though (e.g. gep/array_composite_s.c)
436	if (util::is_byte_indexing(&inst) && (!composite_type \|\| is_pointer_target)) {	1,542✔
437	LOG_DEBUG("Gep with byte offset to pointer-like : " << log::ditype_str(root))
438	return GepIndexToType{root};	32✔
439	}
440
441	assert(composite_type != nullptr && "Root should be a struct-like type.");	3,052!
442
443	if (composite_type->isForwardDecl()) {	1,526✔
444	LOG_DEBUG("Trying to resolve forward-declared composite type " << log::ditype_str(composite_type))
445	return try_resolve_inlined_operator(&inst).value_or(GepIndexToType{root});	72✔
446	}
447
448	LOG_DEBUG("Gep to DI composite: " << log::ditype_str(composite_type))
449	bool skip_first{!util::is_first_non_zero_indexing(&inst)};	1,490✔
450	if (util::is_byte_indexing(&inst)) {	1,490✔
451	LOG_DEBUG("Access based on i8 ptr, assuming byte offsetting into composite member")
452	skip_first = false; // We do not skip over byte index values (likely != 0)	238✔
453	}	238✔
454
455	auto accessed_ditype = resolve_gep_index_to_type(composite_type, GepIndices::create(&inst, skip_first));	1,490!
456
457	return accessed_ditype;	320✔
458	}	2,244✔
459
460	} // namespace dimeta::gep

ahueck / llvm-dimeta / 17204706958

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