https://github.com/Michael137 updated
https://github.com/llvm/llvm-project/pull/83295
>From 7b3d74a917446ad03e605f57fcf9158eee1d21c5 Mon Sep 17 00:00:00 2001
From: Michael Buch <michaelbuc...@gmail.com>
Date: Wed, 28 Feb 2024 13:52:54 +0000
Subject: [PATCH] [lldb][ClangASTImporter] Import record layouts from origin if
available
---
.../Clang/ClangASTImporter.cpp | 23 ++++---
.../API/lang/cpp/gmodules/alignment/Makefile | 4 ++
.../gmodules/alignment/TestPchAlignment.py | 60 +++++++++++++++++++
.../API/lang/cpp/gmodules/alignment/main.cpp | 10 ++++
.../API/lang/cpp/gmodules/alignment/pch.h | 21 +++++++
5 files changed, 111 insertions(+), 7 deletions(-)
create mode 100644 lldb/test/API/lang/cpp/gmodules/alignment/Makefile
create mode 100644
lldb/test/API/lang/cpp/gmodules/alignment/TestPchAlignment.py
create mode 100644 lldb/test/API/lang/cpp/gmodules/alignment/main.cpp
create mode 100644 lldb/test/API/lang/cpp/gmodules/alignment/pch.h
diff --git a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.cpp
b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.cpp
index 99d210c347a21d..30b50df79da90f 100644
--- a/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.cpp
+++ b/lldb/source/Plugins/ExpressionParser/Clang/ClangASTImporter.cpp
@@ -760,7 +760,6 @@ bool ClangASTImporter::LayoutRecordType(
&vbase_offsets) {
RecordDeclToLayoutMap::iterator pos =
m_record_decl_to_layout_map.find(record_decl);
- bool success = false;
base_offsets.clear();
vbase_offsets.clear();
if (pos != m_record_decl_to_layout_map.end()) {
@@ -770,13 +769,23 @@ bool ClangASTImporter::LayoutRecordType(
base_offsets.swap(pos->second.base_offsets);
vbase_offsets.swap(pos->second.vbase_offsets);
m_record_decl_to_layout_map.erase(pos);
- success = true;
- } else {
- bit_size = 0;
- alignment = 0;
- field_offsets.clear();
+ return true;
}
- return success;
+
+ // It's possible that we calculated the layout in a different
+ // ClangASTImporter instance. Try to import such layout if
+ // our decl has an origin.
+ if (auto origin = GetDeclOrigin(record_decl); origin.Valid())
+ if (importRecordLayoutFromOrigin(record_decl, bit_size, alignment,
+ field_offsets, base_offsets,
+ vbase_offsets))
+ return true;
+
+ bit_size = 0;
+ alignment = 0;
+ field_offsets.clear();
+
+ return false;
}
void ClangASTImporter::SetRecordLayout(clang::RecordDecl *decl,
diff --git a/lldb/test/API/lang/cpp/gmodules/alignment/Makefile
b/lldb/test/API/lang/cpp/gmodules/alignment/Makefile
new file mode 100644
index 00000000000000..a6c3e8ca84a3e4
--- /dev/null
+++ b/lldb/test/API/lang/cpp/gmodules/alignment/Makefile
@@ -0,0 +1,4 @@
+PCH_CXX_SOURCE = pch.h
+CXX_SOURCES = main.cpp
+
+include Makefile.rules
diff --git a/lldb/test/API/lang/cpp/gmodules/alignment/TestPchAlignment.py
b/lldb/test/API/lang/cpp/gmodules/alignment/TestPchAlignment.py
new file mode 100644
index 00000000000000..535dd13d0ada48
--- /dev/null
+++ b/lldb/test/API/lang/cpp/gmodules/alignment/TestPchAlignment.py
@@ -0,0 +1,60 @@
+"""
+Tests that we correctly track AST layout info
+(specifically alignment) when moving AST nodes
+between ClangASTImporter instances (in this case,
+from pch to executable to expression AST).
+"""
+
+import lldb
+import os
+from lldbsuite.test.decorators import *
+from lldbsuite.test.lldbtest import *
+from lldbsuite.test import lldbutil
+
+
+class TestPchAlignment(TestBase):
+ @add_test_categories(["gmodules"])
+ def test_expr(self):
+ self.build()
+ lldbutil.run_to_source_breakpoint(
+ self, "return data", lldb.SBFileSpec("main.cpp")
+ )
+
+ self.expect(
+ "frame variable data",
+ substrs=["row = 1", "col = 2", "row = 3", "col = 4", "stride = 5"],
+ )
+
+ @add_test_categories(["gmodules"])
+ def test_frame_var(self):
+ self.build()
+ lldbutil.run_to_source_breakpoint(
+ self, "return data", lldb.SBFileSpec("main.cpp")
+ )
+
+ self.expect_expr(
+ "data",
+ result_type="MatrixData",
+ result_children=[
+ ValueCheck(
+ name="section",
+ children=[
+ ValueCheck(
+ name="origin",
+ children=[
+ ValueCheck(name="row", value="1"),
+ ValueCheck(name="col", value="2"),
+ ],
+ ),
+ ValueCheck(
+ name="size",
+ children=[
+ ValueCheck(name="row", value="3"),
+ ValueCheck(name="col", value="4"),
+ ],
+ ),
+ ],
+ ),
+ ValueCheck(name="stride", value="5"),
+ ],
+ )
diff --git a/lldb/test/API/lang/cpp/gmodules/alignment/main.cpp
b/lldb/test/API/lang/cpp/gmodules/alignment/main.cpp
new file mode 100644
index 00000000000000..5481f3fad1ff76
--- /dev/null
+++ b/lldb/test/API/lang/cpp/gmodules/alignment/main.cpp
@@ -0,0 +1,10 @@
+int main(int argc, const char *argv[]) {
+ struct MatrixData data = {0};
+ data.section.origin.row = 1;
+ data.section.origin.col = 2;
+ data.section.size.row = 3;
+ data.section.size.col = 4;
+ data.stride = 5;
+
+ return data.section.size.row;
+}
diff --git a/lldb/test/API/lang/cpp/gmodules/alignment/pch.h
b/lldb/test/API/lang/cpp/gmodules/alignment/pch.h
new file mode 100644
index 00000000000000..f0be272aa601aa
--- /dev/null
+++ b/lldb/test/API/lang/cpp/gmodules/alignment/pch.h
@@ -0,0 +1,21 @@
+#ifndef PCH_H_IN
+#define PCH_H_IN
+
+static const int kAlignment = 64;
+
+struct [[gnu::aligned(kAlignment)]] RowCol {
+ unsigned row;
+ unsigned col;
+};
+
+struct [[gnu::aligned(kAlignment)]] Submatrix {
+ struct RowCol origin;
+ struct RowCol size;
+};
+
+struct [[gnu::aligned(kAlignment)]] MatrixData {
+ struct Submatrix section;
+ unsigned stride;
+};
+
+#endif // _H_IN
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