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push all args onto stack before moving them into the local var to ensure that the function parameters can be used in the tail recursive function call

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nitrix
2020-03-10 12:07:55 +01:00
parent 8dd0b6cffa
commit 221b928d0e
1 changed files with 7 additions and 3 deletions
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10
src/main/java/de/hsrm/compiler/Klang/visitors/GenASM.java
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@@ -695,16 +695,20 @@ public class GenASM implements Visitor<Void> {
public Void visit(FunctionCall e) { public Void visit(FunctionCall e) {
if (e.isTailRecursive) { if (e.isTailRecursive) {
// Visit the arguments and move them into the location of the corresponding local var // Visit the arguments and move them into the stack
for(int i = 0; i < e.arguments.length; i++) { for(int i = 0; i < e.arguments.length; i++) {
e.arguments[i].welcome(this); e.arguments[i].welcome(this);
int offset = this.env.get(this.currentFunctionParams[i].name);
if (e.arguments[i].type.equals(Type.getFloatType())) { if (e.arguments[i].type.equals(Type.getFloatType())) {
this.ex.write(" movq %xmm0, %rax\n"); this.ex.write(" movq %xmm0, %rax\n");
} }
this.ex.write(" movq %rax, " + offset + "(%rbp)\n"); this.ex.write(" pushq %rax\n");
}
// push args into local var locations, last arg is ontop of the stack
for (int i = e.arguments.length - 1; i >= 0; i--) {
this.ex.write(" popq " + this.env.get(this.currentFunctionParams[i].name) + "(%rbp)\n");
} }
this.ex.write(" jmp .L" + this.currentFunctionStartLabel + "\n"); this.ex.write(" jmp .L" + this.currentFunctionStartLabel + "\n");