1 //===- CallingConvEmitter.cpp - Generate calling conventions --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by Chris Lattner and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This tablegen backend is responsible for emitting descriptions of the calling
11 // conventions supported by this target.
13 //===----------------------------------------------------------------------===//
15 #include "CallingConvEmitter.h"
17 #include "CodeGenTarget.h"
20 void CallingConvEmitter::run(std::ostream &O) {
21 EmitSourceFileHeader("Calling Convention Implementation Fragment", O);
23 std::vector<Record*> CCs = Records.getAllDerivedDefinitions("CallingConv");
25 // Emit prototypes for all of the CC's so that they can forward ref each
27 for (unsigned i = 0, e = CCs.size(); i != e; ++i) {
28 O << "static bool " << CCs[i]->getName()
29 << "(unsigned ValNo, MVT::ValueType ValVT,\n"
30 << std::string(CCs[i]->getName().size()+13, ' ')
31 << "MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,\n"
32 << std::string(CCs[i]->getName().size()+13, ' ')
33 << "unsigned ArgFlags, CCState &State);\n";
36 // Emit each calling convention description in full.
37 for (unsigned i = 0, e = CCs.size(); i != e; ++i)
38 EmitCallingConv(CCs[i], O);
42 void CallingConvEmitter::EmitCallingConv(Record *CC, std::ostream &O) {
43 ListInit *CCActions = CC->getValueAsListInit("Actions");
46 O << "\n\nstatic bool " << CC->getName()
47 << "(unsigned ValNo, MVT::ValueType ValVT,\n"
48 << std::string(CC->getName().size()+13, ' ')
49 << "MVT::ValueType LocVT, CCValAssign::LocInfo LocInfo,\n"
50 << std::string(CC->getName().size()+13, ' ')
51 << "unsigned ArgFlags, CCState &State) {\n";
52 // Emit all of the actions, in order.
53 for (unsigned i = 0, e = CCActions->getSize(); i != e; ++i) {
55 EmitAction(CCActions->getElementAsRecord(i), 2, O);
58 O << "\n return true; // CC didn't match.\n";
62 void CallingConvEmitter::EmitAction(Record *Action,
63 unsigned Indent, std::ostream &O) {
64 std::string IndentStr = std::string(Indent, ' ');
66 if (Action->isSubClassOf("CCPredicateAction")) {
67 O << IndentStr << "if (";
69 if (Action->isSubClassOf("CCIfType")) {
70 ListInit *VTs = Action->getValueAsListInit("VTs");
71 for (unsigned i = 0, e = VTs->getSize(); i != e; ++i) {
72 Record *VT = VTs->getElementAsRecord(i);
73 if (i != 0) O << " ||\n " << IndentStr;
74 O << "LocVT == " << getEnumName(getValueType(VT));
77 } else if (Action->isSubClassOf("CCIf")) {
78 O << Action->getValueAsString("Predicate");
81 throw "Unknown CCPredicateAction!";
85 EmitAction(Action->getValueAsDef("SubAction"), Indent+2, O);
86 O << IndentStr << "}\n";
88 if (Action->isSubClassOf("CCDelegateTo")) {
89 Record *CC = Action->getValueAsDef("CC");
90 O << IndentStr << "if (!" << CC->getName()
91 << "(ValNo, ValVT, LocVT, LocInfo, ArgFlags, State))\n"
92 << IndentStr << " return false;\n";
93 } else if (Action->isSubClassOf("CCAssignToReg")) {
94 ListInit *RegList = Action->getValueAsListInit("RegList");
95 if (RegList->getSize() == 1) {
96 O << IndentStr << "if (unsigned Reg = State.AllocateReg(";
97 O << getQualifiedName(RegList->getElementAsRecord(0)) << ")) {\n";
99 O << IndentStr << "static const unsigned RegList" << ++Counter
101 O << IndentStr << " ";
102 for (unsigned i = 0, e = RegList->getSize(); i != e; ++i) {
103 if (i != 0) O << ", ";
104 O << getQualifiedName(RegList->getElementAsRecord(i));
106 O << "\n" << IndentStr << "};\n";
107 O << IndentStr << "if (unsigned Reg = State.AllocateReg(RegList"
108 << Counter << ", " << RegList->getSize() << ")) {\n";
110 O << IndentStr << " State.addLoc(CCValAssign::getReg(ValNo, ValVT, "
111 << "Reg, LocVT, LocInfo));\n";
112 O << IndentStr << " return false;\n";
113 O << IndentStr << "}\n";
114 } else if (Action->isSubClassOf("CCAssignToStack")) {
115 int Size = Action->getValueAsInt("Size");
116 int Align = Action->getValueAsInt("Align");
118 O << IndentStr << "unsigned Offset" << ++Counter
119 << " = State.AllocateStack(" << Size << ", " << Align << ");\n";
120 O << IndentStr << "State.addLoc(CCValAssign::getMem(ValNo, ValVT, Offset"
121 << Counter << ", LocVT, LocInfo));\n";
122 O << IndentStr << "return false;\n";
123 } else if (Action->isSubClassOf("CCPromoteToType")) {
124 Record *DestTy = Action->getValueAsDef("DestTy");
125 O << IndentStr << "LocVT = " << getEnumName(getValueType(DestTy)) <<";\n";
126 O << IndentStr << "if (ArgFlags & ISD::ParamFlags::SExt)\n"
127 << IndentStr << IndentStr << "LocInfo = CCValAssign::SExt;\n"
128 << IndentStr << "else if (ArgFlags & ISD::ParamFlags::ZExt)\n"
129 << IndentStr << IndentStr << "LocInfo = CCValAssign::ZExt;\n"
130 << IndentStr << "else\n"
131 << IndentStr << IndentStr << "LocInfo = CCValAssign::AExt;\n";
132 } else if (Action->isSubClassOf("CCStructAssign")) {
133 O << "assert(0 && \"Not Implemented\");\n";
136 throw "Unknown CCAction!";