2spill

Source Code

// MyCC code example
// Gabriel Capella
class Test {
    int f;
    int h;
    public void main() {
        int x;
        int y;
        int z;
        x = 51;
        y = 50;
        z = 49;
        print(z);
        print(y);
        print(x);
    }
}

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Results

Assembly

# SPILL %1
.globl main

main:
   pushq  %rbp                # Save old EBP
   movq    %rsp, %rbp         # Save old ESP

   movq    $16, %rax
   movq    %rax, %rdi
   callq   malloc@PLT
   testq   %rax, %rax
   jz      fail_exit
   pushq   %rax

   callq   __LABEL0
   popq   %rax

   movq %rbp, %rsp            # Restore ESP
   popq %rbp                  # Restore EBP
   retq

__LABEL0:
   pushq  %rbp                # Save old EBP
   movq    %rsp, %rbp         # Save old ESP
   addq    $-16, %rsp

   ##MovL %0 <- 51
   movq   $51, %rax
   ##MoMo %1 <- %0
   movq   %rax, %rbx
   ##MovL %9 <- -8
   movq   $-8, %rax
   ##MoOp %9 <- %9,%-1
   addq   %rbp, %rax
   ##RToM #9 <- %1
   movq   %rbx, (%rax)
   ##MovL %2 <- 50
   movq   $50, %rax
   ##MoMo %3 <- %2
   ##MovL %4 <- 49
   movq   $49, %rbx
   ##MoMo %5 <- %4
   ##MoMo %6 <- %5
   ##Prin %6
   pushq  %rax                  ## prepare print call
   pushq  %rbx                  ## prepare print call
   movq   %rbx, %rdi            ## print
   callq   putchar@PLT
   popq   %rbx
   popq   %rax
   ##MoMo %7 <- %3
   ##Prin %7
   pushq  %rax                  ## prepare print call
   pushq  %rbx                  ## prepare print call
   movq   %rax, %rdi            ## print
   callq   putchar@PLT
   popq   %rbx
   popq   %rax
   ##MovL %9 <- -8
   movq   $-8, %rax
   ##MoOp %9 <- %9,%-1
   addq   %rbp, %rax
   ##MToR %9 <- #9
   movq   (%rax), %rax
   ##MoMo %8 <- %9
   ##Prin %8
   pushq  %rax                  ## prepare print call
   pushq  %rbx                  ## prepare print call
   movq   %rax, %rdi            ## print
   callq   putchar@PLT
   popq   %rbx
   popq   %rax

   movq    %rbp, %rsp            # Restore ESP
   popq    %rbp                  # Restore EBP
   retq

fail_exit:
   movl   $1, %eax
   popq   %rbp
   retq

Expected

123

Got

123