From 79a12a0ad1392ecee2d056357e33abaeb02b20ab Mon Sep 17 00:00:00 2001
From: Nathan Henrie <nate@n8henrie.com>
Date: Thu, 1 Feb 2024 09:08:52 -0700
Subject: [PATCH] Add rust-lldb pretty printing for Path and PathBuf

Fixes https://github.com/rust-lang/rust/issues/120553
Fixes https://github.com/rust-lang/rust/issues/48462
---
 src/etc/lldb_commands     |  2 ++
 src/etc/lldb_lookup.py    |  5 +++++
 src/etc/lldb_providers.py | 29 +++++++++++++++++++++++++++++
 src/etc/rust_types.py     |  6 ++++++
 4 files changed, 42 insertions(+)

diff --git a/src/etc/lldb_commands b/src/etc/lldb_commands
index ed66ecf30729e..1a6840540b233 100644
--- a/src/etc/lldb_commands
+++ b/src/etc/lldb_commands
@@ -16,4 +16,6 @@ type summary add -F lldb_lookup.summary_lookup  -e -x -h "^(core::([a-z_]+::)+)R
 type summary add -F lldb_lookup.summary_lookup  -e -x -h "^(core::([a-z_]+::)+)RefMut<.+>$" --category Rust
 type summary add -F lldb_lookup.summary_lookup  -e -x -h "^(core::([a-z_]+::)+)RefCell<.+>$" --category Rust
 type summary add -F lldb_lookup.summary_lookup  -e -x -h "^core::num::([a-z_]+::)*NonZero.+$" --category Rust
+type summary add -F lldb_lookup.summary_lookup  -e -x -h "^std::path::PathBuf$" --category Rust
+type summary add -F lldb_lookup.summary_lookup  -e -x -h "^&std::path::Path$" --category Rust
 type category enable Rust
diff --git a/src/etc/lldb_lookup.py b/src/etc/lldb_lookup.py
index 36c7d82b34ac7..a93b42e1cc449 100644
--- a/src/etc/lldb_lookup.py
+++ b/src/etc/lldb_lookup.py
@@ -58,6 +58,11 @@ def summary_lookup(valobj, dict):
     if rust_type == RustType.STD_NONZERO_NUMBER:
         return StdNonZeroNumberSummaryProvider(valobj, dict)
 
+    if rust_type == RustType.STD_PATHBUF:
+        return StdPathBufSummaryProvider(valobj, dict)
+    if rust_type == RustType.STD_PATH:
+        return StdPathSummaryProvider(valobj, dict)
+
     return ""
 
 
diff --git a/src/etc/lldb_providers.py b/src/etc/lldb_providers.py
index cfb3f0a4eaebe..572a5ec1fb13e 100644
--- a/src/etc/lldb_providers.py
+++ b/src/etc/lldb_providers.py
@@ -173,6 +173,35 @@ def StdStrSummaryProvider(valobj, dict):
     return '"%s"' % data
 
 
+def StdPathBufSummaryProvider(valobj, dict):
+    # type: (SBValue, dict) -> str
+    # logger = Logger.Logger()
+    # logger >> "[StdPathBufSummaryProvider] for " + str(valobj.GetName())
+    return StdOsStringSummaryProvider(valobj.GetChildMemberWithName("inner"), dict)
+
+
+def StdPathSummaryProvider(valobj, dict):
+    # type: (SBValue, dict) -> str
+    # logger = Logger.Logger()
+    # logger >> "[StdPathSummaryProvider] for " + str(valobj.GetName())
+    length = valobj.GetChildMemberWithName("length").GetValueAsUnsigned()
+    if length == 0:
+        return '""'
+
+    data_ptr = valobj.GetChildMemberWithName("data_ptr")
+
+    start = data_ptr.GetValueAsUnsigned()
+    error = SBError()
+    process = data_ptr.GetProcess()
+    data = process.ReadMemory(start, length, error)
+    if PY3:
+        try:
+            data = data.decode(encoding='UTF-8')
+        except UnicodeDecodeError:
+            return '%r' % data
+    return '"%s"' % data
+
+
 class StructSyntheticProvider:
     """Pretty-printer for structs and struct enum variants"""
 
diff --git a/src/etc/rust_types.py b/src/etc/rust_types.py
index bf512bc99b8f2..e956ba31423f5 100644
--- a/src/etc/rust_types.py
+++ b/src/etc/rust_types.py
@@ -32,6 +32,8 @@ class RustType(object):
     STD_REF_MUT = "StdRefMut"
     STD_REF_CELL = "StdRefCell"
     STD_NONZERO_NUMBER = "StdNonZeroNumber"
+    STD_PATH = "StdPath"
+    STD_PATHBUF = "StdPathBuf"
 
 
 STD_STRING_REGEX = re.compile(r"^(alloc::(\w+::)+)String$")
@@ -51,6 +53,8 @@ class RustType(object):
 STD_REF_MUT_REGEX = re.compile(r"^(core::(\w+::)+)RefMut<.+>$")
 STD_REF_CELL_REGEX = re.compile(r"^(core::(\w+::)+)RefCell<.+>$")
 STD_NONZERO_NUMBER_REGEX = re.compile(r"^core::num::([a-z_]+::)*NonZero.+$")
+STD_PATHBUF_REGEX = re.compile(r"^std::path::PathBuf$")
+STD_PATH_REGEX =  re.compile(r"^&std::path::Path$")
 
 TUPLE_ITEM_REGEX = re.compile(r"__\d+$")
 
@@ -75,6 +79,8 @@ class RustType(object):
     RustType.STD_REF_CELL: STD_REF_CELL_REGEX,
     RustType.STD_CELL: STD_CELL_REGEX,
     RustType.STD_NONZERO_NUMBER: STD_NONZERO_NUMBER_REGEX,
+    RustType.STD_PATHBUF: STD_PATHBUF_REGEX,
+    RustType.STD_PATH: STD_PATH_REGEX,
 }
 
 def is_tuple_fields(fields):