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Add support for the switch instruction to the CWriter

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llvm-svn: 5847
This commit is contained in:
Chris Lattner 2003-04-22 20:19:52 +00:00
parent cfeea04b3b
commit 8ca18dd9fa
1 changed files with 23 additions and 7 deletions
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30
lib/CWriter/Writer.cpp
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@ -7,11 +7,7 @@
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Module.h"
#include "llvm/iMemory.h"
#include "llvm/iTerminators.h"
#include "llvm/iPHINode.h"
#include "llvm/iOther.h"
#include "llvm/iOperators.h"
#include "llvm/Instructions.h"
#include "llvm/Pass.h"
#include "llvm/SymbolTable.h"
#include "llvm/SlotCalculator.h"
@ -108,6 +104,7 @@ namespace {
void visitReturnInst(ReturnInst &I);
void visitBranchInst(BranchInst &I);
void visitSwitchInst(SwitchInst &I);
void visitPHINode(PHINode &I) {}
void visitBinaryOperator(Instruction &I);
@ -156,8 +153,8 @@ static string makeNameProper(string x) {
string CWriter::getValueName(const Value *V) {
if (V->hasName()) { // Print out the label if it exists...
if (isa<GlobalValue>(V) && // Do not mangle globals...
cast<GlobalValue>(V)->hasExternalLinkage())// && // Unless it's internal or
//!MangledGlobals.count(V)) // Unless the name would collide if we don't
cast<GlobalValue>(V)->hasExternalLinkage()) // Unless it's internal or
//!MangledGlobals.count(V)) // Unless the name would collide if we don't
return makeNameProper(V->getName());
return "l" + utostr(V->getType()->getUniqueID()) + "_" +
@ -867,6 +864,25 @@ void CWriter::visitReturnInst(ReturnInst &I) {
Out << ";\n";
}
void CWriter::visitSwitchInst(SwitchInst &SI) {
Out << " switch (";
writeOperand(SI.getOperand(0));
Out << ") {\n default: goto ";
writeOperand(SI.getDefaultDest());
Out << ";\n";
for (unsigned i = 2, e = SI.getNumOperands(); i != e; i += 2) {
Out << " case ";
writeOperand(SI.getOperand(i));
Out << ":\n";
BasicBlock *Succ = cast<BasicBlock>(SI.getOperand(i+1));
printBranchToBlock(SI.getParent(), Succ, 2);
if (Succ == SI.getParent()->getNext())
Out << " break;\n";
}
Out << " }\n";
}
static bool isGotoCodeNeccessary(BasicBlock *From, BasicBlock *To) {
// If PHI nodes need copies, we need the copy code...
if (isa<PHINode>(To->front()) ||