From 29a6c81bcd87a541b6e00462f24ca15e9b39654f Mon Sep 17 00:00:00 2001
From: Rene Gollent <anevilyak@gmail.com>
Date: Thu, 23 Jun 2011 00:08:58 +0000
Subject: [PATCH] We now retrieve and unflatten the target BMessage
 successfully, though we don't yet create child nodes for the contained
 fields.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@42287 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 .../value/value_nodes/BMessageValueNode.cpp   | 112 ++++++++++++++++--
 1 file changed, 100 insertions(+), 12 deletions(-)

diff --git a/src/apps/debugger/value/value_nodes/BMessageValueNode.cpp b/src/apps/debugger/value/value_nodes/BMessageValueNode.cpp
index 7f9584f3f0..af214157f1 100644
--- a/src/apps/debugger/value/value_nodes/BMessageValueNode.cpp
+++ b/src/apps/debugger/value/value_nodes/BMessageValueNode.cpp
@@ -8,7 +8,9 @@
 
 #include <new>
 
+#include <AutoDeleter.h>
 #include <Message.h>
+#include <MessagePrivate.h>
 
 #include "Architecture.h"
 #include "StringValue.h"
@@ -19,6 +21,39 @@
 #include "ValueNodeContainer.h"
 
 
+// minimal replica of BMessage's class structure for
+// extracting fields
+class BMessageValue {
+	public:
+		uint32			what;
+
+		virtual			~BMessageValue();
+
+		struct message_header;
+		struct field_header;
+
+		message_header*	fHeader;
+		field_header*	fFields;
+		uint8*			fData;
+
+		uint32			fFieldsAvailable;
+		size_t			fDataAvailable;
+
+		mutable	BMessage* fOriginal;
+
+		BMessage*		fQueueLink;
+			// fQueueLink is used by BMessageQueue to build a linked list
+
+		void*			fArchivingPointer;
+
+		uint32			fReserved[8];
+
+		virtual	void	_ReservedMessage1();
+		virtual	void	_ReservedMessage2();
+		virtual	void	_ReservedMessage3();
+};
+
+
 // #pragma mark - BMessageValueNode
 
 
@@ -77,21 +112,74 @@ BMessageValueNode::ResolvedLocationAndValue(ValueLoader* valueLoader,
 		addressData.SetTo(location->PieceAt(0).address);
 
 
-	TRACE_LOCALS("Address: 0x%" B_PRIx64 "\n", addressData.ToUInt64());
+	TRACE_LOCALS("BMessage: Address: 0x%" B_PRIx64 "\n",
+		addressData.ToUInt64());
 
-	uint8 buffer[sizeof(BMessage)];
-	error = valueLoader->LoadRawValue(addressData, sizeof(BMessage), buffer);
+	uint8 classBuffer[sizeof(BMessage)];
+	error = valueLoader->LoadRawValue(addressData, sizeof(BMessage),
+		classBuffer);
+	if (error != B_OK)
+		return error;
 
-#if APPS_DEBUGGER_TRACE_STACK_FRAME_LOCALS
-	if (error == B_OK) {
-		BMessage* message = (BMessage*)buffer;
-		TRACE_LOCALS("Loaded BMessage('%c%c%c%c')\n",
-			char((message->what >> 24) & 0xff),
-			char((message->what >> 16) & 0xff),
-			char((message->what >> 8) & 0xff),
-			char(message->what & 0xff));
+	BVariant headerAddress;
+	BMessageValue* value = (BMessageValue*)classBuffer;
+	headerAddress.SetTo((target_addr_t)value->fHeader);
+
+	uint8 headerBuffer[sizeof(BMessage::message_header)];
+	error = valueLoader->LoadRawValue(headerAddress, sizeof(headerBuffer),
+		headerBuffer);
+	TRACE_LOCALS("BMessage: Header Address: 0x%" B_PRIx64 ", result: %ld\n",
+		headerAddress.ToUInt64(), error);
+	if (error != B_OK)
+		return error;
+
+	BMessage::message_header* header = (BMessage::message_header*)headerBuffer;
+	size_t fieldsSize = header->field_count * sizeof(BMessage::field_header);
+	size_t totalMessageSize = sizeof(BMessage::message_header)
+		+ fieldsSize + header->data_size;
+
+	uint8* messageBuffer = new(std::nothrow)uint8[totalMessageSize];
+	if (messageBuffer == NULL)
+		return B_NO_MEMORY;
+
+	memset(messageBuffer, 0, totalMessageSize);
+
+	ArrayDeleter<uint8> deleter(messageBuffer);
+
+	// This more or less follows the logic of BMessage::Flatten
+	// in order to reconstruct the flattened buffer ; thus if the
+	// internal representation of that changes, this will have to
+	// follow suit
+	header->what = value->what;
+	uint8* currentBuffer = messageBuffer;
+	memcpy(currentBuffer, header,
+		sizeof(BMessage::message_header));
+
+	if (fieldsSize > 0) {
+		headerAddress.SetTo((target_addr_t)value->fFields);
+		currentBuffer += sizeof(BMessage::message_header);
+		error = valueLoader->LoadRawValue(headerAddress, fieldsSize,
+			currentBuffer);
+		TRACE_LOCALS("BMessage: Field Header Address: 0x%" B_PRIx64
+			", result: %ld\n",	headerAddress.ToUInt64(), error);
+		if (error != B_OK)
+			return error;
+
+		headerAddress.SetTo((target_addr_t)value->fData);
+		currentBuffer += fieldsSize;
+		error = valueLoader->LoadRawValue(headerAddress, header->data_size,
+			currentBuffer);
+		TRACE_LOCALS("BMessage: Data Address: 0x%" B_PRIx64 ", result: %ld\n",
+			headerAddress.ToUInt64(), error);
+		if (error != B_OK)
+			return B_ERROR;
 	}
-#endif
+
+	BMessage message;
+	error = message.Unflatten((const char *)messageBuffer);
+	TRACE_LOCALS("BMessage: Unflatten result: %s\n", strerror(error));
+	if (error != B_OK)
+		return error;
 
 	return B_BAD_VALUE;
 }