e4a1b5f36e
This implements support for [named loops](https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3355.htm) for C2y. When parsing a `LabelStmt`, we create the `LabeDecl` early before we parse the substatement; this label is then passed down to `ParseWhileStatement()` and friends, which then store it in the loop’s (or switch statement’s) `Scope`; when we encounter a `break/continue` statement, we perform a lookup for the label (and error if it doesn’t exist), and then walk the scope stack and check if there is a scope whose preceding label is the target label, which identifies the jump target. The feature is only supported in C2y mode, though a cc1-only option exists for testing (`-fnamed-loops`), which is mostly intended to try and make sure that we don’t have to refactor this entire implementation when/if we start supporting it in C++. --------- Co-authored-by: Balazs Benics <benicsbalazs@gmail.com>
282 lines
7.4 KiB
C
282 lines
7.4 KiB
C
// RUN: %clang_cc1 -std=c2y -triple x86_64-unknown-linux -emit-llvm -o - %s | FileCheck %s
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bool g1();
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bool g2();
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bool g3();
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// CHECK-LABEL: define {{.*}} void @f1()
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// CHECK: entry:
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// CHECK: br label %l1
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// CHECK: l1:
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// CHECK: br label %while.body
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// CHECK: while.body:
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// CHECK: br label %while.end
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// CHECK: while.end:
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// CHECK: br label %l2
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// CHECK: l2:
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// CHECK: br label %while.body1
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// CHECK: while.body1:
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// CHECK: br label %while.body1
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void f1() {
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l1: while (true) break l1;
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l2: while (true) continue l2;
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}
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// CHECK-LABEL: define {{.*}} void @f2()
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// CHECK: entry:
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// CHECK: br label %l1
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// CHECK: l1:
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// CHECK: br label %for.cond
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// CHECK: for.cond:
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// CHECK: br label %for.end
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// CHECK: for.end:
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// CHECK: br label %l2
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// CHECK: l2:
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// CHECK: br label %for.cond1
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// CHECK: for.cond1:
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// CHECK: br label %for.cond1
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void f2() {
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l1: for (;;) break l1;
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l2: for (;;) continue l2;
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}
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// CHECK-LABEL: define {{.*}} void @f3()
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// CHECK: entry:
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// CHECK: br label %l1
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// CHECK: l1:
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// CHECK: br label %do.body
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// CHECK: do.body:
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// CHECK: br label %do.end
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// CHECK: do.cond:
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// CHECK: br i1 true, label %do.body, label %do.end
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// CHECK: do.end:
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// CHECK: br label %l2
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// CHECK: l2:
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// CHECK: br label %do.body1
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// CHECK: do.body1:
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// CHECK: br label %do.cond2
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// CHECK: do.cond2:
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// CHECK: br i1 true, label %do.body1, label %do.end3
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// CHECK: do.end3:
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// CHECK: ret void
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void f3() {
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l1: do { break l1; } while (true);
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l2: do { continue l2; } while (true);
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}
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// CHECK-LABEL: define {{.*}} void @f4()
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// CHECK: entry:
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// CHECK: br label %l1
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// CHECK: l1:
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// CHECK: br label %while.cond
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// CHECK: while.cond:
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// CHECK: %call = call {{.*}} i1 @g1()
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// CHECK: br i1 %call, label %while.body, label %while.end14
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// CHECK: while.body:
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// CHECK: br label %l2
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// CHECK: l2:
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// CHECK: br label %while.cond1
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// CHECK: while.cond1:
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// CHECK: %call2 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call2, label %while.body3, label %while.end
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// CHECK: while.body3:
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// CHECK: %call4 = call {{.*}} i1 @g3()
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// CHECK: br i1 %call4, label %if.then, label %if.end
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// CHECK: if.then:
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// CHECK: br label %while.end14
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// CHECK: if.end:
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// CHECK: %call5 = call {{.*}} i1 @g3()
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// CHECK: br i1 %call5, label %if.then6, label %if.end7
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// CHECK: if.then6:
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// CHECK: br label %while.end
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// CHECK: if.end7:
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// CHECK: %call8 = call {{.*}} i1 @g3()
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// CHECK: br i1 %call8, label %if.then9, label %if.end10
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// CHECK: if.then9:
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// CHECK: br label %while.cond
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// CHECK: if.end10:
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// CHECK: %call11 = call {{.*}} i1 @g3()
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// CHECK: br i1 %call11, label %if.then12, label %if.end13
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// CHECK: if.then12:
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// CHECK: br label %while.cond1
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// CHECK: if.end13:
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// CHECK: br label %while.cond1
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// CHECK: while.end:
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// CHECK: br label %while.cond
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// CHECK: while.end14:
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// CHECK: ret void
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void f4() {
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l1: while (g1()) {
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l2: while (g2()) {
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if (g3()) break l1;
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if (g3()) break l2;
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if (g3()) continue l1;
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if (g3()) continue l2;
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}
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}
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}
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// CHECK-LABEL: define {{.*}} void @f5()
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// CHECK: entry:
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// CHECK: br label %l1
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// CHECK: l1:
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// CHECK: br label %while.cond
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// CHECK: while.cond:
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// CHECK: %call = call {{.*}} i1 @g1()
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// CHECK: br i1 %call, label %while.body, label %while.end
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// CHECK: while.body:
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// CHECK: br label %l2
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// CHECK: l2:
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// CHECK: %call1 = call {{.*}} i1 @g2()
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// CHECK: %conv = zext i1 %call1 to i32
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// CHECK: switch i32 %conv, label %sw.epilog [
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// CHECK: i32 1, label %sw.bb
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// CHECK: i32 2, label %sw.bb2
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// CHECK: i32 3, label %sw.bb3
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// CHECK: ]
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// CHECK: sw.bb:
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// CHECK: br label %while.end
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// CHECK: sw.bb2:
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// CHECK: br label %sw.epilog
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// CHECK: sw.bb3:
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// CHECK: br label %while.cond
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// CHECK: sw.epilog:
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// CHECK: br label %while.cond
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// CHECK: while.end:
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// CHECK: ret void
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void f5() {
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l1: while (g1()) {
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l2: switch (g2()) {
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case 1: break l1;
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case 2: break l2;
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case 3: continue l1;
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}
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}
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}
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// CHECK-LABEL: define {{.*}} void @f6()
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// CHECK: entry:
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// CHECK: br label %l1
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// CHECK: l1:
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// CHECK: br label %while.cond
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// CHECK: while.cond:
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// CHECK: %call = call {{.*}} i1 @g1()
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// CHECK: br i1 %call, label %while.body, label %while.end28
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// CHECK: while.body:
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// CHECK: br label %l2
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// CHECK: l2:
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// CHECK: br label %for.cond
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// CHECK: for.cond:
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// CHECK: %call1 = call {{.*}} i1 @g1()
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// CHECK: br i1 %call1, label %for.body, label %for.end
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// CHECK: for.body:
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// CHECK: br label %l3
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// CHECK: l3:
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// CHECK: br label %do.body
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// CHECK: do.body:
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// CHECK: br label %l4
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// CHECK: l4:
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// CHECK: br label %while.cond2
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// CHECK: while.cond2:
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// CHECK: %call3 = call {{.*}} i1 @g1()
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// CHECK: br i1 %call3, label %while.body4, label %while.end
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// CHECK: while.body4:
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// CHECK: %call5 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call5, label %if.then, label %if.end
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// CHECK: if.then:
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// CHECK: br label %while.end28
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// CHECK: if.end:
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// CHECK: %call6 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call6, label %if.then7, label %if.end8
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// CHECK: if.then7:
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// CHECK: br label %for.end
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// CHECK: if.end8:
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// CHECK: %call9 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call9, label %if.then10, label %if.end11
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// CHECK: if.then10:
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// CHECK: br label %do.end
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// CHECK: if.end11:
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// CHECK: %call12 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call12, label %if.then13, label %if.end14
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// CHECK: if.then13:
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// CHECK: br label %while.end
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// CHECK: if.end14:
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// CHECK: %call15 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call15, label %if.then16, label %if.end17
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// CHECK: if.then16:
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// CHECK: br label %while.cond
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// CHECK: if.end17:
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// CHECK: %call18 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call18, label %if.then19, label %if.end20
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// CHECK: if.then19:
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// CHECK: br label %for.cond
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// CHECK: if.end20:
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// CHECK: %call21 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call21, label %if.then22, label %if.end23
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// CHECK: if.then22:
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// CHECK: br label %do.cond
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// CHECK: if.end23:
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// CHECK: %call24 = call {{.*}} i1 @g2()
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// CHECK: br i1 %call24, label %if.then25, label %if.end26
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// CHECK: if.then25:
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// CHECK: br label %while.cond2
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// CHECK: if.end26:
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// CHECK: br label %while.cond2
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// CHECK: while.end:
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// CHECK: br label %do.cond
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// CHECK: do.cond:
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// CHECK: %call27 = call {{.*}} i1 @g1()
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// CHECK: br i1 %call27, label %do.body, label %do.end
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// CHECK: do.end:
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// CHECK: br label %for.cond
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// CHECK: for.end:
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// CHECK: br label %while.cond
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// CHECK: while.end28:
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// CHECK: ret void
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void f6() {
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l1: while (g1()) {
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l2: for (; g1();) {
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l3: do {
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l4: while (g1()) {
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if (g2()) break l1;
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if (g2()) break l2;
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if (g2()) break l3;
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if (g2()) break l4;
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if (g2()) continue l1;
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if (g2()) continue l2;
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if (g2()) continue l3;
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if (g2()) continue l4;
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}
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} while (g1());
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}
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}
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}
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// CHECK-LABEL: define {{.*}} void @f7()
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// CHECK: entry:
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// CHECK: br label %loop
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// CHECK: loop:
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// CHECK: br label %while.cond
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// CHECK: while.cond:
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// CHECK: %call = call {{.*}} i1 @g1()
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// CHECK: br i1 %call, label %while.body, label %while.end
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// CHECK: while.body:
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// CHECK: %call1 = call {{.*}} i1 @g2()
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// CHECK: %conv = zext i1 %call1 to i32
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// CHECK: switch i32 %conv, label %sw.epilog [
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// CHECK: i32 1, label %sw.bb
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// CHECK: ]
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// CHECK: sw.bb:
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// CHECK: br label %while.end
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// CHECK: sw.epilog:
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// CHECK: br label %while.cond
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// CHECK: while.end:
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// CHECK: ret void
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void f7() {
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loop: while (g1()) {
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switch (g2()) {
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case 1: break loop;
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}
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}
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}
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