CodeGen for CapturedStmts
EmitCapturedStmt creates a captured struct containing all of the captured
variables, and then emits a call to the outlined function. This is similar in
principle to EmitBlockLiteral.
GenerateCapturedFunction actually produces the outlined function. It is based
on GenerateBlockFunction, but is much simpler. The function type is determined
by the parameters that are in the CapturedDecl.
Some changes have been added to this patch that were reviewed as part of the
serialization patch and moving the parameters to the captured decl.
Differential Revision: http://llvm-reviews.chandlerc.com/D640
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@181536 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGStmt.cpp b/lib/CodeGen/CGStmt.cpp
index 208455c..353d6c3 100644
--- a/lib/CodeGen/CGStmt.cpp
+++ b/lib/CodeGen/CGStmt.cpp
@@ -22,6 +22,7 @@
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/InlineAsm.h"
#include "llvm/IR/Intrinsics.h"
+#include "llvm/Support/CallSite.h"
using namespace clang;
using namespace CodeGen;
@@ -137,7 +138,7 @@
case Stmt::GCCAsmStmtClass: // Intentional fall-through.
case Stmt::MSAsmStmtClass: EmitAsmStmt(cast<AsmStmt>(*S)); break;
case Stmt::CapturedStmtClass:
- EmitCapturedStmt(cast<CapturedStmt>(*S));
+ EmitCapturedStmt(cast<CapturedStmt>(*S), CR_Default);
break;
case Stmt::ObjCAtTryStmtClass:
EmitObjCAtTryStmt(cast<ObjCAtTryStmt>(*S));
@@ -1750,6 +1751,94 @@
}
}
-void CodeGenFunction::EmitCapturedStmt(const CapturedStmt &S) {
- llvm_unreachable("not implemented yet");
+static LValue InitCapturedStruct(CodeGenFunction &CGF, const CapturedStmt &S) {
+ const RecordDecl *RD = S.getCapturedRecordDecl();
+ QualType RecordTy = CGF.getContext().getRecordType(RD);
+
+ // Initialize the captured struct.
+ LValue SlotLV = CGF.MakeNaturalAlignAddrLValue(
+ CGF.CreateMemTemp(RecordTy, "agg.captured"), RecordTy);
+
+ RecordDecl::field_iterator CurField = RD->field_begin();
+ for (CapturedStmt::capture_init_iterator I = S.capture_init_begin(),
+ E = S.capture_init_end();
+ I != E; ++I, ++CurField) {
+ LValue LV = CGF.EmitLValueForFieldInitialization(SlotLV, *CurField);
+ CGF.EmitInitializerForField(*CurField, LV, *I, ArrayRef<VarDecl *>());
+ }
+
+ return SlotLV;
+}
+
+/// Generate an outlined function for the body of a CapturedStmt, store any
+/// captured variables into the captured struct, and call the outlined function.
+llvm::Function *
+CodeGenFunction::EmitCapturedStmt(const CapturedStmt &S, CapturedRegionKind K) {
+ const CapturedDecl *CD = S.getCapturedDecl();
+ const RecordDecl *RD = S.getCapturedRecordDecl();
+ assert(CD->hasBody() && "missing CapturedDecl body");
+
+ LValue CapStruct = InitCapturedStruct(*this, S);
+
+ // Emit the CapturedDecl
+ CodeGenFunction CGF(CGM, true);
+ CGF.CapturedStmtInfo = new CGCapturedStmtInfo(S, K);
+ llvm::Function *F = CGF.GenerateCapturedStmtFunction(CD, RD);
+ delete CGF.CapturedStmtInfo;
+
+ // Emit call to the helper function.
+ EmitCallOrInvoke(F, CapStruct.getAddress());
+
+ return F;
+}
+
+/// Creates the outlined function for a CapturedStmt.
+llvm::Function *
+CodeGenFunction::GenerateCapturedStmtFunction(const CapturedDecl *CD,
+ const RecordDecl *RD) {
+ assert(CapturedStmtInfo &&
+ "CapturedStmtInfo should be set when generating the captured function");
+
+ // Check if we should generate debug info for this function.
+ maybeInitializeDebugInfo();
+
+ // Build the argument list.
+ ASTContext &Ctx = CGM.getContext();
+ FunctionArgList Args;
+ Args.append(CD->param_begin(), CD->param_end());
+
+ // Create the function declaration.
+ FunctionType::ExtInfo ExtInfo;
+ const CGFunctionInfo &FuncInfo =
+ CGM.getTypes().arrangeFunctionDeclaration(Ctx.VoidTy, Args, ExtInfo,
+ /*IsVariadic=*/false);
+ llvm::FunctionType *FuncLLVMTy = CGM.getTypes().GetFunctionType(FuncInfo);
+
+ llvm::Function *F =
+ llvm::Function::Create(FuncLLVMTy, llvm::GlobalValue::InternalLinkage,
+ CapturedStmtInfo->getHelperName(), &CGM.getModule());
+ CGM.SetInternalFunctionAttributes(CD, F, FuncInfo);
+
+ // Generate the function.
+ StartFunction(CD, Ctx.VoidTy, F, FuncInfo, Args, CD->getBody()->getLocStart());
+
+ // Set the context parameter in CapturedStmtInfo.
+ llvm::Value *DeclPtr = LocalDeclMap[CD->getContextParam()];
+ assert(DeclPtr && "missing context parameter for CapturedStmt");
+ CapturedStmtInfo->setContextValue(Builder.CreateLoad(DeclPtr));
+
+ // If 'this' is captured, load it into CXXThisValue.
+ if (CapturedStmtInfo->isCXXThisExprCaptured()) {
+ FieldDecl *FD = CapturedStmtInfo->getThisFieldDecl();
+ LValue LV = MakeNaturalAlignAddrLValue(CapturedStmtInfo->getContextValue(),
+ Ctx.getTagDeclType(RD));
+ LValue ThisLValue = EmitLValueForField(LV, FD);
+
+ CXXThisValue = EmitLoadOfLValue(ThisLValue).getScalarVal();
+ }
+
+ CapturedStmtInfo->EmitBody(*this, CD->getBody());
+ FinishFunction(CD->getBodyRBrace());
+
+ return F;
}