commit e9e16c5f52c4a093f4de234d448cdebedab8938e
author Devang Patel <dpatel@apple.com> Tue Mar 01 22:58:13 2011 +0000
committer Devang Patel <dpatel@apple.com> Tue Mar 01 22:58:13 2011 +0000
tree 30919eba1124cefad5813d264bfb9d0fb9e82131
parent d9f574b724a208ec38761e250d83fcc2480e685c

Today, the language front ends produces llvm.dbg.* intrinsics, used to encode arguments' debug info, in order any way, most of the times. However, if a front end mix-n-matches llvm.dbg.declare and llvm.dbg.value intrinsics to encode debug info for arguments then code generator needs a way to find argument order.

Use 8 bits from line number field to keep track of argument ordering while encoding debug info for an argument. That leaves 24 bit for line no, DebugLoc also allocates 24 bit for line numbers. If a function has more than 255 arguments then rest of the arguments will be ordered by llvm.dbg.* intrinsics' ordering in IR.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126793 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/DIBuilder.cpp

diff --git a/lib/Analysis/DIBuilder.cpp b/lib/Analysis/DIBuilder.cpp
index 590a9c1..766624f 100644
--- a/lib/Analysis/DIBuilder.cpp
+++ b/lib/Analysis/DIBuilder.cpp
@@ -586,13 +586,14 @@
 DIVariable DIBuilder::createLocalVariable(unsigned Tag, DIDescriptor Scope,
                                           StringRef Name, DIFile File,
                                           unsigned LineNo, DIType Ty, 
-                                          bool AlwaysPreserve, unsigned Flags) {
+                                          bool AlwaysPreserve, unsigned Flags,
+                                          unsigned ArgNo) {
   Value *Elts[] = {
     GetTagConstant(VMContext, Tag),
     Scope,
     MDString::get(VMContext, Name),
     File,
-    ConstantInt::get(Type::getInt32Ty(VMContext), LineNo),
+    ConstantInt::get(Type::getInt32Ty(VMContext), (LineNo | (ArgNo << 24))),
     Ty,
     ConstantInt::get(Type::getInt32Ty(VMContext), Flags)
   };
@@ -620,13 +621,13 @@
                                             StringRef Name, DIFile F,
                                             unsigned LineNo,
                                             DIType Ty, Value *const *Addr,
-                                            unsigned NumAddr) {
+                                            unsigned NumAddr, unsigned ArgNo) {
   SmallVector<Value *, 15> Elts;
   Elts.push_back(GetTagConstant(VMContext, Tag));
   Elts.push_back(Scope);
   Elts.push_back(MDString::get(VMContext, Name));
   Elts.push_back(F);
-  Elts.push_back(ConstantInt::get(Type::getInt32Ty(VMContext), LineNo));
+  Elts.push_back(ConstantInt::get(Type::getInt32Ty(VMContext), (LineNo | (ArgNo << 24))));
   Elts.push_back(Ty);
   Elts.append(Addr, Addr+NumAddr);
 
@@ -642,7 +643,6 @@
                                        bool isLocalToUnit, bool isDefinition,
                                        unsigned Flags, bool isOptimized,
                                        Function *Fn) {
-
   Value *Elts[] = {
     GetTagConstant(VMContext, dwarf::DW_TAG_subprogram),
     llvm::Constant::getNullValue(Type::getInt32Ty(VMContext)),