Initial import of lldb

Change-Id: Ib244e837bee349effa12b2ff6ffffbe3d730e929

external/bsd/llvm/dist/lldb/source/Expression/ClangUtilityFunction.cpp

@@ -0,0 +1,169 @@
+//===-- ClangUserExpression.cpp -------------------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// C Includes
+#include <stdio.h>
+#if HAVE_SYS_TYPES_H
+#  include <sys/types.h>
+#endif
+
+// C++ Includes
+
+#include "lldb/Core/ConstString.h"
+#include "lldb/Core/Log.h"
+#include "lldb/Core/Stream.h"
+#include "lldb/Core/StreamFile.h"
+#include "lldb/Expression/ClangExpressionDeclMap.h"
+#include "lldb/Expression/ClangExpressionParser.h"
+#include "lldb/Expression/ClangUtilityFunction.h"
+#include "lldb/Expression/ExpressionSourceCode.h"
+#include "lldb/Expression/IRExecutionUnit.h"
+#include "lldb/Host/Host.h"
+#include "lldb/Target/ExecutionContext.h"
+#include "lldb/Target/Target.h"
+
+using namespace lldb_private;
+
+//------------------------------------------------------------------
+/// Constructor
+///
+/// @param[in] text
+///     The text of the function.  Must be a full translation unit.
+///
+/// @param[in] name
+///     The name of the function, as used in the text.
+//------------------------------------------------------------------
+ClangUtilityFunction::ClangUtilityFunction (const char *text, 
+                                            const char *name) :
+    ClangExpression (),
+    m_function_text (ExpressionSourceCode::g_expression_prefix),
+    m_function_name (name)
+{
+    if (text && text[0])
+        m_function_text.append (text);
+}
+
+ClangUtilityFunction::~ClangUtilityFunction ()
+{
+}
+
+//------------------------------------------------------------------
+/// Install the utility function into a process
+///
+/// @param[in] error_stream
+///     A stream to print parse errors and warnings to.
+///
+/// @param[in] exe_ctx
+///     The execution context to install the utility function to.
+///
+/// @return
+///     True on success (no errors); false otherwise.
+//------------------------------------------------------------------
+bool
+ClangUtilityFunction::Install (Stream &error_stream,
+                               ExecutionContext &exe_ctx)
+{
+    if (m_jit_start_addr != LLDB_INVALID_ADDRESS)
+    {
+        error_stream.PutCString("error: already installed\n");
+        return false;
+    }
+    
+    ////////////////////////////////////
+    // Set up the target and compiler
+    //
+    
+    Target *target = exe_ctx.GetTargetPtr();
+    
+    if (!target)
+    {
+        error_stream.PutCString ("error: invalid target\n");
+        return false;
+    }
+    
+    Process *process = exe_ctx.GetProcessPtr();
+    
+    if (!process)
+    {
+        error_stream.PutCString ("error: invalid process\n");
+        return false;
+    }
+        
+    //////////////////////////
+    // Parse the expression
+    //
+    
+    bool keep_result_in_memory = false;
+    
+    m_expr_decl_map.reset(new ClangExpressionDeclMap(keep_result_in_memory, exe_ctx));
+    
+    if (!m_expr_decl_map->WillParse(exe_ctx, NULL))
+    {
+        error_stream.PutCString ("error: current process state is unsuitable for expression parsing\n");
+        return false;
+    }
+        
+    ClangExpressionParser parser(exe_ctx.GetBestExecutionContextScope(), *this);
+    
+    unsigned num_errors = parser.Parse (error_stream);
+    
+    if (num_errors)
+    {
+        error_stream.Printf ("error: %d errors parsing expression\n", num_errors);
+        
+        m_expr_decl_map.reset();
+        
+        return false;
+    }
+    
+    //////////////////////////////////
+    // JIT the output of the parser
+    //
+        
+    bool can_interpret = false; // should stay that way
+    
+    Error jit_error = parser.PrepareForExecution (m_jit_start_addr, 
+                                                  m_jit_end_addr,
+                                                  m_execution_unit_ap,
+                                                  exe_ctx,
+                                                  can_interpret,
+                                                  eExecutionPolicyAlways);
+    
+    if (m_jit_start_addr != LLDB_INVALID_ADDRESS)
+        m_jit_process_wp = lldb::ProcessWP(process->shared_from_this());
+    
+#if 0
+	// jingham: look here
+    StreamFile logfile ("/tmp/exprs.txt", "a");
+    logfile.Printf ("0x%16.16" PRIx64 ": func = %s, source =\n%s\n",
+                    m_jit_start_addr, 
+                    m_function_name.c_str(), 
+                    m_function_text.c_str());
+#endif
+
+    m_expr_decl_map->DidParse();
+    
+    m_expr_decl_map.reset();
+    
+    if (jit_error.Success())
+    {
+        return true;
+    }
+    else
+    {
+        const char *error_cstr = jit_error.AsCString();
+        if (error_cstr && error_cstr[0])
+            error_stream.Printf ("error: %s\n", error_cstr);
+        else
+            error_stream.Printf ("error: expression can't be interpreted or run\n");
+        return false;
+    }
+}
+
+