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* net/loveruby/cflat/compiler/CodeGenerator.java (compileFunctionBody): remove bp from saveRegs first. 

git-svn-id: file:///Users/aamine/c/gitwork/public/cbc/trunk@4107 1b9489fe-b721-0410-924e-b54b9192deb8
This commit is contained in:
Minero Aoki 2008-12-14 11:43:51 +00:00
parent 0defdae27a
commit e0105bda01
2 changed files with 21 additions and 14 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
Sun Dec 14 20:43:47 2008 Minero Aoki <aamine@loveruby.net>
* net/loveruby/cflat/compiler/CodeGenerator.java
(compileFunctionBody): remove bp from saveRegs first.
Mon Dec 8 00:55:33 2008 Minero Aoki <aamine@loveruby.net>
* lib/alloca.s: alloca() implemeted.

30
net/loveruby/cflat/compiler/CodeGenerator.java
View File

@ -307,11 +307,12 @@ public class CodeGenerator
List<Assembly> bodyAsms = compileStmts(func);
AsmStatistics stats = AsmStatistics.collect(bodyAsms);
bodyAsms = reduceLabels(bodyAsms, stats);
List<Register> saveRegs = usedCalleeSavedRegisters(stats);
List<Register> saveRegs = usedCalleeSavedRegistersWithoutBP(stats);
long lvarBytes = allocateLocalVariables(func.body().scope(),
saveRegs.size());
prologue(func, saveRegs, lvarBytes);
if (options.isPositionIndependent() && stats.doesRegisterUsed(GOTBaseReg())) {
if (options.isPositionIndependent()
&& stats.doesRegisterUsed(GOTBaseReg())) {
loadGOTBaseAddress(GOTBaseReg());
}
as.addAll(bodyAsms);
@ -354,10 +355,10 @@ public class CodeGenerator
}
// #@@}
protected List<Register> usedCalleeSavedRegisters(AsmStatistics stats) {
protected List<Register> usedCalleeSavedRegistersWithoutBP(AsmStatistics stats) {
List<Register> result = new ArrayList<Register>();
for (Register reg : calleeSavedRegisters()) {
if (stats.doesRegisterUsed(reg)) {
if (stats.doesRegisterUsed(reg) && !reg.equals(bp())) {
result.add(reg);
}
}
@ -435,8 +436,14 @@ public class CodeGenerator
protected void epilogue(DefinedFunction func,
List<Register> savedRegs,
long lvarBytes) {
shrinkStack(lvarBytes);
restoreRegisters(savedRegs);
//shrinkStack(lvarBytes);
if (! savedRegs.isEmpty()) {
long offset = stackGrowsLower
? -1 * savedRegs.size() * stackWordSize
: (savedRegs.size() - 1) * stackWordSize;
lea(mem(offset, bp()), sp());
restoreRegisters(savedRegs);
}
mov(bp(), sp());
pop(bp());
ret();
@ -445,19 +452,14 @@ public class CodeGenerator
protected void saveRegisters(List<Register> saveRegs) {
for (Register reg : saveRegs) {
if (! reg.equals(bp())) { // bp is already saved.
push(reg);
}
push(reg);
}
}
protected void restoreRegisters(List<Register> savedRegs) {
ListIterator<Register> regs = savedRegs.listIterator(savedRegs.size());
while (regs.hasPrevious()) {
Register reg = regs.previous();
if (! reg.equals(bp())) { // bp is going to be restored.
pop(reg);
}
pop(regs.previous());
}
}
@ -490,7 +492,7 @@ public class CodeGenerator
* Note that numSavedRegs includes bp.
*/
protected long allocateLocalVariables(LocalScope scope, long numSavedRegs) {
long initLen = (numSavedRegs - 1) * stackWordSize;
long initLen = numSavedRegs * stackWordSize;
long maxLen = allocateScope(scope, initLen);
return maxLen - initLen;
}