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DI: Rewrite the DIBuilder local variable API

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Replace the general `createLocalVariable()` with two more specific
functions: `createParameterVariable()` and `createAutoVariable()`, and
rewrite the documentation.

Besides cleaning up the API, this avoids exposing the fake DWARF tags
`DW_TAG_arg_variable` and `DW_TAG_auto_variable` to frontends, and is
preparation for removing them completely.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@243764 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-07-31 17:55:53 +00:00
parent 3f2cb5c959
commit aa50fa7c2f
6 changed files with 67 additions and 34 deletions
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26
lib/IR/DIBuilder.cpp
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@@ -602,15 +602,18 @@ DIGlobalVariable *DIBuilder::createTempGlobalVariableFwdDecl(
.release();
}
DILocalVariable *DIBuilder::createLocalVariable(
unsigned Tag, DIScope *Scope, StringRef Name, DIFile *File, unsigned LineNo,
DIType *Ty, bool AlwaysPreserve, unsigned Flags, unsigned ArgNo) {
static DILocalVariable *createLocalVariable(
LLVMContext &VMContext,
DenseMap<MDNode *, std::vector<TrackingMDNodeRef>> &PreservedVariables,
DIScope *Scope, StringRef Name, unsigned ArgNo, DIFile *File,
unsigned LineNo, DIType *Ty, bool AlwaysPreserve, unsigned Flags) {
// FIXME: Why getNonCompileUnitScope()?
// FIXME: Why is "!Context" okay here?
// FIXME: Why doesn't this check for a subprogram or lexical block (AFAICT
// the only valid scopes)?
DIScope *Context = getNonCompileUnitScope(Scope);
dwarf::Tag Tag = ArgNo ? dwarf::DW_TAG_arg_variable : dwarf::DW_TAG_auto_variable;
auto *Node = DILocalVariable::get(
VMContext, Tag, cast_or_null<DILocalScope>(Context), Name, File, LineNo,
DITypeRef::get(Ty), ArgNo, Flags);
@@ -625,6 +628,23 @@ DILocalVariable *DIBuilder::createLocalVariable(
return Node;
}
DILocalVariable *DIBuilder::createAutoVariable(DIScope *Scope, StringRef Name,
DIFile *File, unsigned LineNo,
DIType *Ty, bool AlwaysPreserve,
unsigned Flags) {
return createLocalVariable(VMContext, PreservedVariables, Scope, Name,
/* ArgNo */ 0, File, LineNo, Ty, AlwaysPreserve,
Flags);
}
DILocalVariable *DIBuilder::createParameterVariable(
DIScope *Scope, StringRef Name, unsigned ArgNo, DIFile *File,
unsigned LineNo, DIType *Ty, bool AlwaysPreserve, unsigned Flags) {
assert(ArgNo && "Expected non-zero argument number for parameter");
return createLocalVariable(VMContext, PreservedVariables, Scope, Name, ArgNo,
File, LineNo, Ty, AlwaysPreserve, Flags);
}
DIExpression *DIBuilder::createExpression(ArrayRef<uint64_t> Addr) {
return DIExpression::get(VMContext, Addr);
}