forked from OSchip/llvm-project
Refactoring std::function formatter to move core functionality into CPPLanguageRuntime
Patch by Shafik Yaghmour. Differential Revision: https://reviews.llvm.org/D51896 llvm-svn: 341991
This commit is contained in:
Shafik Yaghmour
parent
48e5b8b1a4
commit
443e20ba32
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@ -24,6 +24,25 @@ namespace lldb_private {
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class CPPLanguageRuntime : public LanguageRuntime {
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class CPPLanguageRuntime : public LanguageRuntime {
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public:
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public:
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enum class LibCppStdFunctionCallableCase {
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Lambda = 0,
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CallableObject,
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FreeOrMemberFunction,
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Invalid
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};
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struct LibCppStdFunctionCallableInfo {
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Symbol callable_symbol;
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Address callable_address;
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LineEntry callable_line_entry;
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lldb::addr_t member__f_pointer_value = 0u;
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LibCppStdFunctionCallableCase callable_case =
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LibCppStdFunctionCallableCase::Invalid;
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};
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LibCppStdFunctionCallableInfo
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FindLibCppStdFunctionCallableInfo(lldb::ValueObjectSP &valobj_sp);
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~CPPLanguageRuntime() override;
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~CPPLanguageRuntime() override;
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lldb::LanguageType GetLanguageType() const override {
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lldb::LanguageType GetLanguageType() const override {
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@ -23,6 +23,7 @@
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#include "lldb/DataFormatters/TypeSummary.h"
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#include "lldb/DataFormatters/TypeSummary.h"
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#include "lldb/DataFormatters/VectorIterator.h"
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#include "lldb/DataFormatters/VectorIterator.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Target/CPPLanguageRuntime.h"
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#include "lldb/Target/ProcessStructReader.h"
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#include "lldb/Target/ProcessStructReader.h"
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#include "lldb/Target/SectionLoadList.h"
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#include "lldb/Target/SectionLoadList.h"
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#include "lldb/Target/Target.h"
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#include "lldb/Target/Target.h"
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@ -65,217 +66,45 @@ bool lldb_private::formatters::LibcxxFunctionSummaryProvider(
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if (!valobj_sp)
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if (!valobj_sp)
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return false;
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return false;
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// Member __f_ has type __base*, the contents of which will hold:
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// 1) a vtable entry which may hold type information needed to discover the
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// lambda being called
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// 2) possibly hold a pointer to the callable object
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// e.g.
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//
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// (lldb) frame var -R f_display
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// (std::__1::function<void (int)>) f_display = {
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// __buf_ = {
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// …
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// }
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// __f_ = 0x00007ffeefbffa00
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// }
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// (lldb) memory read -fA 0x00007ffeefbffa00
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// 0x7ffeefbffa00: ... `vtable for std::__1::__function::__func<void (*) ...
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// 0x7ffeefbffa08: ... `print_num(int) at std_function_cppreference_exam ...
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//
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// We will be handling five cases below, std::function is wrapping:
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//
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// 1) a lambda we know at compile time. We will obtain the name of the lambda
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// from the first template pameter from __func's vtable. We will look up
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// the lambda's operator()() and obtain the line table entry.
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// 2) a lambda we know at runtime. A pointer to the lambdas __invoke method
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// will be stored after the vtable. We will obtain the lambdas name from
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// this entry and lookup operator()() and obtain the line table entry.
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// 3) a callable object via operator()(). We will obtain the name of the
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// object from the first template parameter from __func's vtable. We will
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// look up the objectc operator()() and obtain the line table entry.
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// 4) a member function. A pointer to the function will stored after the
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// we will obtain the name from this pointer.
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// 5) a free function. A pointer to the function will stored after the vtable
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// we will obtain the name from this pointer.
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ValueObjectSP member__f_(
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valobj_sp->GetChildMemberWithName(ConstString("__f_"), true));
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lldb::addr_t member__f_pointer_value = member__f_->GetValueAsUnsigned(0);
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ExecutionContext exe_ctx(valobj_sp->GetExecutionContextRef());
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ExecutionContext exe_ctx(valobj_sp->GetExecutionContextRef());
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Process *process = exe_ctx.GetProcessPtr();
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Process *process = exe_ctx.GetProcessPtr();
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if (process == nullptr)
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if (process == nullptr)
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return false;
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return false;
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uint32_t address_size = process->GetAddressByteSize();
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CPPLanguageRuntime *cpp_runtime = process->GetCPPLanguageRuntime();
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Status status;
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// First item pointed to by __f_ should be the pointer to the vtable for
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if (!cpp_runtime)
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// a __base object.
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lldb::addr_t vtable_address =
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process->ReadPointerFromMemory(member__f_pointer_value, status);
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if (status.Fail())
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return false;
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return false;
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bool found_wrapped_function = false;
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CPPLanguageRuntime::LibCppStdFunctionCallableInfo callable_info =
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cpp_runtime->FindLibCppStdFunctionCallableInfo(valobj_sp);
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// Using scoped exit so we can use early return and still execute the default
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switch (callable_info.callable_case) {
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// action in case we don't find the wrapper function. Otherwise we can't use
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case CPPLanguageRuntime::LibCppStdFunctionCallableCase::Invalid:
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// early exit without duplicating code.
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stream.Printf(" __f_ = %" PRIu64, callable_info.member__f_pointer_value);
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auto default_print_on_exit = llvm::make_scope_exit(
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[&found_wrapped_function, &stream, &member__f_pointer_value]() {
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if (!found_wrapped_function)
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stream.Printf(" __f_ = %" PRIu64, member__f_pointer_value);
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});
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lldb::addr_t address_after_vtable = member__f_pointer_value + address_size;
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// As commened above we may not have a function pointer but if we do we will
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// need it.
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lldb::addr_t possible_function_address =
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process->ReadPointerFromMemory(address_after_vtable, status);
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if (status.Fail())
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return false;
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return false;
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break;
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Target &target = process->GetTarget();
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case CPPLanguageRuntime::LibCppStdFunctionCallableCase::Lambda:
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stream.Printf(
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if (target.GetSectionLoadList().IsEmpty())
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" Lambda in File %s at Line %u",
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return false;
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callable_info.callable_line_entry.file.GetFilename().GetCString(),
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callable_info.callable_line_entry.line);
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Address vtable_addr_resolved;
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break;
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SymbolContext sc;
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case CPPLanguageRuntime::LibCppStdFunctionCallableCase::CallableObject:
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Symbol *symbol;
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stream.Printf(
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" Function in File %s at Line %u",
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if (!target.GetSectionLoadList().ResolveLoadAddress(vtable_address,
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callable_info.callable_line_entry.file.GetFilename().GetCString(),
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vtable_addr_resolved))
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callable_info.callable_line_entry.line);
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return false;
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break;
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case CPPLanguageRuntime::LibCppStdFunctionCallableCase::FreeOrMemberFunction:
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target.GetImages().ResolveSymbolContextForAddress(
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stream.Printf(" Function = %s ",
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vtable_addr_resolved, eSymbolContextEverything, sc);
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callable_info.callable_symbol.GetName().GetCString());
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symbol = sc.symbol;
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break;
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if (symbol == NULL)
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return false;
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llvm::StringRef vtable_name(symbol->GetName().GetCString());
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bool found_expected_start_string =
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vtable_name.startswith("vtable for std::__1::__function::__func<");
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if (!found_expected_start_string)
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return false;
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// Given case 1 or 3 we have a vtable name, we are want to extract the first
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// template parameter
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//
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// ... __func<main::$_0, std::__1::allocator<main::$_0> ...
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// ^^^^^^^^^
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//
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// We do this by find the first < and , and extracting in between.
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//
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// This covers the case of the lambda known at compile time.
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//
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size_t first_open_angle_bracket = vtable_name.find('<') + 1;
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size_t first_comma = vtable_name.find_first_of(',');
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llvm::StringRef first_template_parameter =
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vtable_name.slice(first_open_angle_bracket, first_comma);
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Address function_address_resolved;
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// Setup for cases 2, 4 and 5 we have a pointer to a function after the
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// vtable. We will use a process of elimination to drop through each case
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// and obtain the data we need.
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if (target.GetSectionLoadList().ResolveLoadAddress(
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possible_function_address, function_address_resolved)) {
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target.GetImages().ResolveSymbolContextForAddress(
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function_address_resolved, eSymbolContextEverything, sc);
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symbol = sc.symbol;
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}
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auto get_name = [&first_template_parameter, &symbol]() {
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// Given case 1:
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//
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// main::$_0
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//
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// we want to append ::operator()()
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if (first_template_parameter.contains("$_"))
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return llvm::Regex::escape(first_template_parameter.str()) +
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R"(::operator\(\)\(.*\))";
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if (symbol != NULL &&
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symbol->GetName().GetStringRef().contains("__invoke")) {
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llvm::StringRef symbol_name = symbol->GetName().GetStringRef();
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size_t pos2 = symbol_name.find_last_of(':');
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// Given case 2:
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//
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// main::$_1::__invoke(...)
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//
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// We want to slice off __invoke(...) and append operator()()
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std::string lambda_operator =
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llvm::Regex::escape(symbol_name.slice(0, pos2 + 1).str()) +
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R"(operator\(\)\(.*\))";
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return lambda_operator;
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}
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// Case 3
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return first_template_parameter.str() + R"(::operator\(\)\(.*\))";
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;
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};
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std::string func_to_match = get_name();
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SymbolContextList scl;
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target.GetImages().FindFunctions(RegularExpression{func_to_match}, true, true,
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true, scl);
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// Case 1,2 or 3
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if (scl.GetSize() >= 1) {
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SymbolContext sc2 = scl[0];
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AddressRange range;
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sc2.GetAddressRange(eSymbolContextEverything, 0, false, range);
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Address address = range.GetBaseAddress();
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Address addr;
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if (target.ResolveLoadAddress(address.GetCallableLoadAddress(&target),
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addr)) {
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LineEntry line_entry;
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addr.CalculateSymbolContextLineEntry(line_entry);
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found_wrapped_function = true;
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if (first_template_parameter.contains("$_") ||
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(symbol != NULL &&
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symbol->GetName().GetStringRef().contains("__invoke"))) {
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// Case 1 and 2
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stream.Printf(" Lambda in File %s at Line %u",
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line_entry.file.GetFilename().GetCString(),
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line_entry.line);
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} else {
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// Case 3
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stream.Printf(" Function in File %s at Line %u",
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line_entry.file.GetFilename().GetCString(),
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line_entry.line);
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}
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}
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return true;
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return true;
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}
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}
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}
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// Case 4 or 5
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if (!symbol->GetName().GetStringRef().startswith("vtable for")) {
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found_wrapped_function = true;
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stream.Printf(" Function = %s ", symbol->GetName().GetCString());
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return true;
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}
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return false;
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}
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bool lldb_private::formatters::LibcxxSmartPointerSummaryProvider(
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bool lldb_private::formatters::LibcxxSmartPointerSummaryProvider(
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ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
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ValueObject &valobj, Stream &stream, const TypeSummaryOptions &options) {
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@ -14,9 +14,20 @@
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#include "llvm/ADT/StringRef.h"
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#include "llvm/ADT/StringRef.h"
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#include "lldb/API/SBValue.h"
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#include "lldb/Symbol/Block.h"
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#include "lldb/Symbol/VariableList.h"
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#include "lldb/API/SBFrame.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/PluginManager.h"
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#include "lldb/Core/UniqueCStringMap.h"
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#include "lldb/Core/UniqueCStringMap.h"
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#include "lldb/Symbol/ClangASTContext.h"
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#include "lldb/Target/ABI.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/ExecutionContext.h"
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#include "lldb/Target/RegisterContext.h"
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#include "lldb/Target/SectionLoadList.h"
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#include "lldb/Target/StackFrame.h"
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#include "lldb/Target/ThreadPlanRunToAddress.h"
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using namespace lldb;
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using namespace lldb;
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using namespace lldb_private;
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using namespace lldb_private;
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@ -40,3 +51,216 @@ bool CPPLanguageRuntime::GetObjectDescription(
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// C++ has no generic way to do this.
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// C++ has no generic way to do this.
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return false;
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return false;
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}
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}
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CPPLanguageRuntime::LibCppStdFunctionCallableInfo
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CPPLanguageRuntime::FindLibCppStdFunctionCallableInfo(
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lldb::ValueObjectSP &valobj_sp) {
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LibCppStdFunctionCallableInfo optional_info;
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if (!valobj_sp)
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return optional_info;
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// Member __f_ has type __base*, the contents of which will hold:
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// 1) a vtable entry which may hold type information needed to discover the
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// lambda being called
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// 2) possibly hold a pointer to the callable object
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// e.g.
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//
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// (lldb) frame var -R f_display
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// (std::__1::function<void (int)>) f_display = {
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// __buf_ = {
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// …
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// }
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// __f_ = 0x00007ffeefbffa00
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// }
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// (lldb) memory read -fA 0x00007ffeefbffa00
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// 0x7ffeefbffa00: ... `vtable for std::__1::__function::__func<void (*) ...
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// 0x7ffeefbffa08: ... `print_num(int) at std_function_cppreference_exam ...
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//
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// We will be handling five cases below, std::function is wrapping:
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//
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// 1) a lambda we know at compile time. We will obtain the name of the lambda
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// from the first template pameter from __func's vtable. We will look up
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// the lambda's operator()() and obtain the line table entry.
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// 2) a lambda we know at runtime. A pointer to the lambdas __invoke method
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// will be stored after the vtable. We will obtain the lambdas name from
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// this entry and lookup operator()() and obtain the line table entry.
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// 3) a callable object via operator()(). We will obtain the name of the
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// object from the first template parameter from __func's vtable. We will
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// look up the objectc operator()() and obtain the line table entry.
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// 4) a member function. A pointer to the function will stored after the
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// we will obtain the name from this pointer.
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// 5) a free function. A pointer to the function will stored after the vtable
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// we will obtain the name from this pointer.
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ValueObjectSP member__f_(
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valobj_sp->GetChildMemberWithName(ConstString("__f_"), true));
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lldb::addr_t member__f_pointer_value = member__f_->GetValueAsUnsigned(0);
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optional_info.member__f_pointer_value = member__f_pointer_value;
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ExecutionContext exe_ctx(valobj_sp->GetExecutionContextRef());
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Process *process = exe_ctx.GetProcessPtr();
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if (process == nullptr)
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return optional_info;
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uint32_t address_size = process->GetAddressByteSize();
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Status status;
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||||||
|
// First item pointed to by __f_ should be the pointer to the vtable for
|
||||||
|
// a __base object.
|
||||||
|
lldb::addr_t vtable_address =
|
||||||
|
process->ReadPointerFromMemory(member__f_pointer_value, status);
|
||||||
|
|
||||||
|
if (status.Fail())
|
||||||
|
return optional_info;
|
||||||
|
|
||||||
|
lldb::addr_t address_after_vtable = member__f_pointer_value + address_size;
|
||||||
|
// As commened above we may not have a function pointer but if we do we will
|
||||||
|
// need it.
|
||||||
|
lldb::addr_t possible_function_address =
|
||||||
|
process->ReadPointerFromMemory(address_after_vtable, status);
|
||||||
|
|
||||||
|
if (status.Fail())
|
||||||
|
return optional_info;
|
||||||
|
|
||||||
|
Target &target = process->GetTarget();
|
||||||
|
|
||||||
|
if (target.GetSectionLoadList().IsEmpty())
|
||||||
|
return optional_info;
|
||||||
|
|
||||||
|
Address vtable_addr_resolved;
|
||||||
|
SymbolContext sc;
|
||||||
|
Symbol *symbol;
|
||||||
|
|
||||||
|
if (!target.GetSectionLoadList().ResolveLoadAddress(vtable_address,
|
||||||
|
vtable_addr_resolved))
|
||||||
|
return optional_info;
|
||||||
|
|
||||||
|
target.GetImages().ResolveSymbolContextForAddress(
|
||||||
|
vtable_addr_resolved, eSymbolContextEverything, sc);
|
||||||
|
symbol = sc.symbol;
|
||||||
|
|
||||||
|
if (symbol == nullptr)
|
||||||
|
return optional_info;
|
||||||
|
|
||||||
|
llvm::StringRef vtable_name(symbol->GetName().GetCString());
|
||||||
|
bool found_expected_start_string =
|
||||||
|
vtable_name.startswith("vtable for std::__1::__function::__func<");
|
||||||
|
|
||||||
|
if (!found_expected_start_string)
|
||||||
|
return optional_info;
|
||||||
|
|
||||||
|
// Given case 1 or 3 we have a vtable name, we are want to extract the first
|
||||||
|
// template parameter
|
||||||
|
//
|
||||||
|
// ... __func<main::$_0, std::__1::allocator<main::$_0> ...
|
||||||
|
// ^^^^^^^^^
|
||||||
|
//
|
||||||
|
// We do this by find the first < and , and extracting in between.
|
||||||
|
//
|
||||||
|
// This covers the case of the lambda known at compile time.
|
||||||
|
//
|
||||||
|
size_t first_open_angle_bracket = vtable_name.find('<') + 1;
|
||||||
|
size_t first_comma = vtable_name.find_first_of(',');
|
||||||
|
|
||||||
|
llvm::StringRef first_template_parameter =
|
||||||
|
vtable_name.slice(first_open_angle_bracket, first_comma);
|
||||||
|
|
||||||
|
Address function_address_resolved;
|
||||||
|
|
||||||
|
// Setup for cases 2, 4 and 5 we have a pointer to a function after the
|
||||||
|
// vtable. We will use a process of elimination to drop through each case
|
||||||
|
// and obtain the data we need.
|
||||||
|
if (target.GetSectionLoadList().ResolveLoadAddress(
|
||||||
|
possible_function_address, function_address_resolved)) {
|
||||||
|
target.GetImages().ResolveSymbolContextForAddress(
|
||||||
|
function_address_resolved, eSymbolContextEverything, sc);
|
||||||
|
symbol = sc.symbol;
|
||||||
|
}
|
||||||
|
|
||||||
|
auto get_name = [&first_template_parameter, &symbol]() {
|
||||||
|
// Given case 1:
|
||||||
|
//
|
||||||
|
// main::$_0
|
||||||
|
//
|
||||||
|
// we want to append ::operator()()
|
||||||
|
if (first_template_parameter.contains("$_"))
|
||||||
|
return llvm::Regex::escape(first_template_parameter.str()) +
|
||||||
|
R"(::operator\(\)\(.*\))";
|
||||||
|
|
||||||
|
if (symbol != NULL &&
|
||||||
|
symbol->GetName().GetStringRef().contains("__invoke")) {
|
||||||
|
|
||||||
|
llvm::StringRef symbol_name = symbol->GetName().GetStringRef();
|
||||||
|
size_t pos2 = symbol_name.find_last_of(':');
|
||||||
|
|
||||||
|
// Given case 2:
|
||||||
|
//
|
||||||
|
// main::$_1::__invoke(...)
|
||||||
|
//
|
||||||
|
// We want to slice off __invoke(...) and append operator()()
|
||||||
|
std::string lambda_operator =
|
||||||
|
llvm::Regex::escape(symbol_name.slice(0, pos2 + 1).str()) +
|
||||||
|
R"(operator\(\)\(.*\))";
|
||||||
|
|
||||||
|
return lambda_operator;
|
||||||
|
}
|
||||||
|
|
||||||
|
// Case 3
|
||||||
|
return first_template_parameter.str() + R"(::operator\(\)\(.*\))";
|
||||||
|
;
|
||||||
|
};
|
||||||
|
|
||||||
|
std::string func_to_match = get_name();
|
||||||
|
|
||||||
|
SymbolContextList scl;
|
||||||
|
|
||||||
|
target.GetImages().FindFunctions(RegularExpression{func_to_match}, true, true,
|
||||||
|
true, scl);
|
||||||
|
|
||||||
|
// Case 1,2 or 3
|
||||||
|
if (scl.GetSize() >= 1) {
|
||||||
|
SymbolContext sc2 = scl[0];
|
||||||
|
|
||||||
|
AddressRange range;
|
||||||
|
sc2.GetAddressRange(eSymbolContextEverything, 0, false, range);
|
||||||
|
|
||||||
|
Address address = range.GetBaseAddress();
|
||||||
|
|
||||||
|
Address addr;
|
||||||
|
if (target.ResolveLoadAddress(address.GetCallableLoadAddress(&target),
|
||||||
|
addr)) {
|
||||||
|
LineEntry line_entry;
|
||||||
|
addr.CalculateSymbolContextLineEntry(line_entry);
|
||||||
|
|
||||||
|
if (first_template_parameter.contains("$_") ||
|
||||||
|
(symbol != nullptr &&
|
||||||
|
symbol->GetName().GetStringRef().contains("__invoke"))) {
|
||||||
|
// Case 1 and 2
|
||||||
|
optional_info.callable_case = LibCppStdFunctionCallableCase::Lambda;
|
||||||
|
} else {
|
||||||
|
// Case 3
|
||||||
|
optional_info.callable_case =
|
||||||
|
LibCppStdFunctionCallableCase::CallableObject;
|
||||||
|
}
|
||||||
|
|
||||||
|
optional_info.callable_symbol = *symbol;
|
||||||
|
optional_info.callable_line_entry = line_entry;
|
||||||
|
optional_info.callable_address = addr;
|
||||||
|
return optional_info;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
// Case 4 or 5
|
||||||
|
if (!symbol->GetName().GetStringRef().startswith("vtable for")) {
|
||||||
|
optional_info.callable_case =
|
||||||
|
LibCppStdFunctionCallableCase::FreeOrMemberFunction;
|
||||||
|
optional_info.callable_address = function_address_resolved;
|
||||||
|
optional_info.callable_symbol = *symbol;
|
||||||
|
|
||||||
|
return optional_info;
|
||||||
|
}
|
||||||
|
|
||||||
|
return optional_info;
|
||||||
|
}
|
||||||
|
|
|
||||||
Loading…
Reference in New Issue