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160 lines
4.6 KiB
C
160 lines
4.6 KiB
C
// #target: macos-x64
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module demo;
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import libc;
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import std::io;
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fault MathError
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{
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DIVISION_BY_ZERO
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}
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fn int foo() { return 123; }
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fn int bar() { return 0; }
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fn double! divide(int a, int b)
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{
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if (b == 0) return MathError.DIVISION_BY_ZERO!;
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return (double)(a) / (double)(b);
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}
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// Rethrowing an error uses "?" suffix
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fn void! testMayError()
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{
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divide(foo(), bar())?;
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}
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fn void main()
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{
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// ratio has a failable type.
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double! ratio = divide(foo(), bar());
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// Handle the error
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if (catch err = ratio)
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{
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case MathError.DIVISION_BY_ZERO:
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libc::printf("Division by zero\n");
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return;
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default:
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libc::printf("Unexpected error!");
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return;
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}
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// Flow typing makes "ratio"
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// have the type double here.
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libc::printf("Ratio was %f\n", ratio);
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}
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/* #expect: demo.ll
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define i64 @demo_divide(ptr %0, i32 %1, i32 %2) #0 {
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entry:
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%reterr = alloca i64, align 8
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%eq = icmp eq i32 %2, 0
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br i1 %eq, label %if.then, label %if.exit
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if.then: ; preds = %entry
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ret i64 ptrtoint (ptr @"demo_MathError$DIVISION_BY_ZERO" to i64)
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if.exit: ; preds = %entry
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%sifp = sitofp i32 %1 to double
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%sifp1 = sitofp i32 %2 to double
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%fdiv = fdiv double %sifp, %sifp1
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store double %fdiv, ptr %0, align 8
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ret i64 0
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}
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define i64 @demo_testMayError() #0 {
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entry:
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%error_var = alloca i64, align 8
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%retparam = alloca double, align 8
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%reterr = alloca i64, align 8
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%0 = call i32 @demo_foo()
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%1 = call i32 @demo_bar()
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%2 = call i64 @demo_divide(ptr %retparam, i32 %0, i32 %1)
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%not_err = icmp eq i64 %2, 0
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br i1 %not_err, label %after_check, label %assign_optional
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assign_optional: ; preds = %entry
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store i64 %2, ptr %error_var, align 8
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br label %guard_block
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after_check: ; preds = %entry
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br label %noerr_block
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guard_block: ; preds = %assign_optional
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%3 = load i64, ptr %error_var, align 8
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ret i64 %3
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noerr_block: ; preds = %after_check
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ret i64 0
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}
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define void @demo_main() #0 {
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entry:
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%ratio = alloca double, align 8
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%ratio.f = alloca i64, align 8
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%retparam = alloca double, align 8
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%err = alloca i64, align 8
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%switch = alloca i64, align 8
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%0 = call i32 @demo_foo()
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%1 = call i32 @demo_bar()
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%2 = call i64 @demo_divide(ptr %retparam, i32 %0, i32 %1)
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%not_err = icmp eq i64 %2, 0
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br i1 %not_err, label %after_check, label %assign_optional
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assign_optional: ; preds = %entry
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store i64 %2, ptr %ratio.f, align 8
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br label %after_assign
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after_check: ; preds = %entry
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%3 = load double, ptr %retparam, align 8
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store double %3, ptr %ratio, align 8
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store i64 0, ptr %ratio.f, align 8
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br label %after_assign
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after_assign: ; preds = %after_check, %assign_optional
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br label %testblock
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testblock: ; preds = %after_assign
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%optval = load i64, ptr %ratio.f, align 8
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%not_err1 = icmp eq i64 %optval, 0
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br i1 %not_err1, label %after_check3, label %assign_optional2
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assign_optional2: ; preds = %testblock
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store i64 %optval, ptr %err, align 8
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br label %end_block
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after_check3: ; preds = %testblock
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store i64 0, ptr %err, align 8
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br label %end_block
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end_block: ; preds = %after_check3, %assign_optional2
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%4 = load i64, ptr %err, align 8
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%neq = icmp ne i64 %4, 0
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br i1 %neq, label %if.then, label %if.exit
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if.then: ; preds = %end_block
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store i64 %4, ptr %switch, align 8
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br label %switch.entry
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switch.entry: ; preds = %if.then
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%5 = load i64, ptr %switch, align 8
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%eq = icmp eq i64 ptrtoint (ptr @"demo_MathError$DIVISION_BY_ZERO" to i64), %5
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br i1 %eq, label %switch.case, label %next_if
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switch.case: ; preds = %switch.entry
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%6 = call i32 (ptr, ...) @printf(ptr @.str)
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ret void
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next_if: ; preds = %switch.entry
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br label %switch.default
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switch.default: ; preds = %next_if
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%7 = call i32 (ptr, ...) @printf(ptr @.str.1)
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ret void
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if.exit: ; preds = %end_block
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%8 = load double, ptr %ratio, align 8
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%9 = call i32 (ptr, ...) @printf(ptr @.str.2, double %8)
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ret void
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}
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