| // Copyright 2018 The Fuchsia Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include "src/developer/debug/zxdb/symbols/code_block.h" |
| |
| #include <lib/syslog/cpp/macros.h> |
| |
| #include "src/developer/debug/zxdb/symbols/function.h" |
| #include "src/developer/debug/zxdb/symbols/symbol_context.h" |
| |
| namespace zxdb { |
| |
| CodeBlock::CodeBlock(DwarfTag tag) : Symbol(tag) { |
| FX_DCHECK(tag == DwarfTag::kSubprogram || tag == DwarfTag::kInlinedSubroutine || |
| tag == DwarfTag::kLexicalBlock); |
| } |
| |
| CodeBlock::~CodeBlock() = default; |
| |
| const CodeBlock* CodeBlock::AsCodeBlock() const { return this; } |
| |
| AddressRanges CodeBlock::GetAbsoluteCodeRanges(const SymbolContext& symbol_context) const { |
| return symbol_context.RelativeToAbsolute(code_ranges()); |
| } |
| |
| AddressRange CodeBlock::GetFullRange(const SymbolContext& symbol_context) const { |
| if (code_ranges_.empty()) |
| return AddressRange(); |
| return AddressRange(symbol_context.RelativeToAbsolute(code_ranges_.front().begin()), |
| symbol_context.RelativeToAbsolute(code_ranges_.back().end())); |
| } |
| |
| bool CodeBlock::ContainsAddress(const SymbolContext& symbol_context, |
| uint64_t absolute_address) const { |
| if (code_ranges_.empty()) |
| return true; // No defined code range, assume always valid. |
| |
| for (const auto& range : code_ranges_) { |
| if (absolute_address >= symbol_context.RelativeToAbsolute(range.begin()) && |
| absolute_address < symbol_context.RelativeToAbsolute(range.end())) |
| return true; |
| } |
| return false; |
| } |
| |
| const CodeBlock* CodeBlock::GetMostSpecificChild(const SymbolContext& symbol_context, |
| uint64_t absolute_address, |
| bool recurse_into_inlines) const { |
| if (!ContainsAddress(symbol_context, absolute_address)) |
| return nullptr; // This block doesn't contain the address. |
| |
| for (const auto& inner : inner_blocks_) { |
| // Don't expect more than one inner block to cover the address, so return |
| // the first match. Everything in the inner_blocks_ should resolve to a |
| // CodeBlock object. |
| const CodeBlock* inner_block = inner.Get()->AsCodeBlock(); |
| if (!inner_block) |
| continue; // Corrupted symbols. |
| if (!recurse_into_inlines && inner_block->tag() == DwarfTag::kInlinedSubroutine) |
| continue; // Skip inlined function. |
| |
| const CodeBlock* found = |
| inner_block->GetMostSpecificChild(symbol_context, absolute_address, recurse_into_inlines); |
| if (found) |
| return found; |
| } |
| |
| // This block covers the address but no children do. |
| return this; |
| } |
| |
| fxl::RefPtr<Function> CodeBlock::GetContainingFunction() const { |
| // Need to hold references when walking up the symbol hierarchy. |
| fxl::RefPtr<CodeBlock> cur_block = RefPtrTo(this); |
| while (cur_block) { |
| if (const Function* function = cur_block->AsFunction()) |
| return RefPtrTo(function); |
| |
| auto parent_ref = cur_block->parent().Get(); |
| cur_block = RefPtrTo(parent_ref->AsCodeBlock()); |
| } |
| return fxl::RefPtr<Function>(); |
| } |
| |
| std::vector<fxl::RefPtr<Function>> CodeBlock::GetInlineChain() const { |
| std::vector<fxl::RefPtr<Function>> result; |
| |
| // Need to hold references when walking up the symbol hierarchy. |
| fxl::RefPtr<CodeBlock> cur_block = RefPtrTo(this); |
| while (cur_block) { |
| if (const Function* function = cur_block->AsFunction()) { |
| result.push_back(RefPtrTo(function)); |
| |
| if (function->is_inline()) { |
| // Follow the inlined structure via containing_block() rather than the lexical structure of |
| // the inlined function (e.g. its parent class). |
| auto containing = function->containing_block().Get(); |
| cur_block = RefPtrTo(containing->AsCodeBlock()); |
| } else { |
| // Just added containing non-inline function so we're done. |
| break; |
| } |
| } else { |
| auto parent_ref = cur_block->parent().Get(); |
| cur_block = RefPtrTo(parent_ref->AsCodeBlock()); |
| } |
| } |
| return result; |
| } |
| |
| std::vector<fxl::RefPtr<Function>> CodeBlock::GetAmbiguousInlineChain( |
| const SymbolContext& symbol_context, TargetPointer absolute_address) const { |
| std::vector<fxl::RefPtr<Function>> result; |
| |
| // For simplicity this gets the inline chain and then filters for ambiguous locations. This may |
| // throw away some work which GetInlineChain() did. |
| std::vector<fxl::RefPtr<Function>> inline_chain = GetInlineChain(); |
| for (size_t i = 0; i < inline_chain.size(); i++) { |
| result.push_back(inline_chain[i]); |
| if (!inline_chain[i]->is_inline() || |
| inline_chain[i]->GetFullRange(symbol_context).begin() != absolute_address) { |
| // Non-ambiguous location, we're done. |
| break; |
| } |
| } |
| |
| return result; |
| } |
| |
| } // namespace zxdb |