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apps/mu.subx
75
apps/mu.subx
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@ -1014,6 +1014,51 @@ test-missing-return:
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5d/pop-to-ebp
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c3/return
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test-early-exit-without-return:
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# . prologue
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# setup
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(clear-stream _test-input-stream)
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(clear-stream $_test-input-buffered-file->buffer)
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(clear-stream _test-output-stream)
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(clear-stream $_test-output-buffered-file->buffer)
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(clear-stream _test-error-stream)
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(clear-stream $_test-error-buffered-file->buffer)
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# var ed/edx: exit-descriptor = tailor-exit-descriptor(16)
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68/push 0/imm32
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68/push 0/imm32
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89/<- %edx 4/r32/esp
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(tailor-exit-descriptor %edx 0x10)
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#
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(write _test-input-stream "fn foo -> _/eax: int {\n")
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(write _test-input-stream " break\n")
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(write _test-input-stream " return 0\n")
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(write _test-input-stream "}\n")
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# convert
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(convert-mu _test-input-buffered-file _test-output-buffered-file _test-error-buffered-file %edx)
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# registers except esp clobbered at this point
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# restore ed
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89/<- %edx 4/r32/esp
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(flush _test-output-buffered-file)
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(flush _test-error-buffered-file)
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#? # dump _test-error-stream {{{
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#? (write 2 "^")
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#? (write-stream 2 _test-error-stream)
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#? (write 2 "$\n")
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#? (rewind-stream _test-error-stream)
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#? # }}}
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# check output
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(check-stream-equal _test-output-stream "" "F - test-early-exit-without-return: output should be empty")
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(check-next-stream-line-equal _test-error-stream "fn foo has outputs, so you cannot 'break' out of the outermost block. Use 'return'." "F - test-early-exit-without-return: error message")
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# check that stop(1) was called
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(check-ints-equal *(edx+4) 2 "F - test-early-exit-without-return: exit status")
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# don't restore from ebp
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81 0/subop/add %esp 8/imm32
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# . epilogue
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5d/pop-to-ebp
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c3/return
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test-return-with-too-few-inouts:
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# . prologue
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55/push-ebp
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@ -16299,8 +16344,36 @@ check-no-breaks: # block: (addr block), fn: (addr function), err: (addr buffere
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55/push-ebp
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89/<- %ebp 4/r32/esp
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# . save registers
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50/push-eax
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51/push-ecx
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# var curr/ecx: (addr list stmt) = block->stmts
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8b/-> *(ebp+8) 0/r32/eax
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(lookup *(eax+4) *(eax+8)) # Block-stmts Block-stmts => eax
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89/<- %ecx 0/r32/eax
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{
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# if curr->next == 0, break
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(lookup *(ecx+8) *(ecx+0xc)) # List-next List-next => eax
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3d/compare-eax-and 0/imm32
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74/jump-if-= break/disp8
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# if curr->value->tag != Stmt1, continue
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(lookup *ecx *(ecx+4)) # List-value List-value => eax
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81 7/subop/compare *eax 1/imm32/stmt1 # Stmt-tag
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75/jump-if-!= $check-no-breaks:continue/disp8
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# if curr->value->operation starts with "break", abort
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(lookup *(eax+4) *(eax+8)) # Stmt1-operation Stmt1-operation => eax
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(string-starts-with? %eax "break") # => eax
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3d/compare-eax-and 0/imm32/false
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75/jump-if-!= $check-no-breaks:error/disp8
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$check-no-breaks:continue:
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# curr = curr->next
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(lookup *(ecx+8) *(ecx+0xc)) # List-next List-next => eax
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89/<- %ecx 0/r32/eax
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e9/jump loop/disp32
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}
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$check-no-breaks:end:
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# . restore registers
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59/pop-to-ecx
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58/pop-to-eax
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# . epilogue
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89/<- %esp 5/r32/ebp
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5d/pop-to-ebp
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@ -16311,7 +16384,7 @@ $check-no-breaks:error:
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8b/-> *(ebp+0xc) 0/r32/eax
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(lookup *eax *(eax+4)) # Function-name Function-name => eax
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(write-buffered *(ebp+0x10) %eax)
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(write-buffered *(ebp+0x10) ": final statement should be a 'return'\n")
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(write-buffered *(ebp+0x10) " has outputs, so you cannot 'break' out of the outermost block. Use 'return'.\n")
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(flush *(ebp+0x10))
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(stop *(ebp+0x14) 1)
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# never gets here
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