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951525e0a5
Summary:
This allows you to make some of the defs in a multiclass or `foreach`
conditional on an expression computed from the parameters or iteration
variables.
It was already possible to simulate an if statement using a `foreach`
with a dummy iteration variable and a list constructed using `!if` so
that it had length 0 or 1 depending on the condition, e.g.
foreach unusedIterationVar = !if(condition, [1], []<int>) in { ... }
But this syntax is nicer to read, and also more convenient because it
allows an else clause.
To avoid upheaval in the implementation, I've implemented `if` as pure
syntactic sugar on the `foreach` implementation: internally, `ParseIf`
actually does construct exactly the kind of foreach shown above (and
another reversed one for the else clause if present).
Reviewers: nhaehnle, hfinkel
Reviewed By: hfinkel
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D71474
146 lines
4.8 KiB
TableGen
146 lines
4.8 KiB
TableGen
// RUN: llvm-tblgen %s | FileCheck %s
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// RUN: not llvm-tblgen -DERROR1 %s 2>&1 | FileCheck --check-prefix=ERROR1 %s
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// RUN: not llvm-tblgen -DERROR2 %s 2>&1 | FileCheck --check-prefix=ERROR2 %s
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// RUN: not llvm-tblgen -DERROR3 %s 2>&1 | FileCheck --check-prefix=ERROR3 %s
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#ifdef ERROR1
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// Refer to a variable we haven't defined *yet*, expecting an error.
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// ERROR1: [[@LINE+1]]:22: error: Variable not defined: 'myvar'
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def bad { dag x = (? myvar); }
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#endif
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// Define a global variable.
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defvar myvar = "foo";
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#ifdef ERROR2
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// Demonstrate an error when a global variable is redefined.
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// ERROR2: [[@LINE+1]]:8: error: def or global variable of this name already exists
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defvar myvar = "another value";
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#endif
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multiclass Test<int x> {
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// Refer to a global variable, while inside a local scope like a multiclass.
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def _with_global_string { string s = myvar; }
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// Define some variables local to this multiclass, and prove we can refer to
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// those too.
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defvar myvar = !add(x, 100);
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defvar myvar2 = "string of " # myvar;
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def _with_local_int { int i = myvar; string s = myvar2; }
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#ifdef ERROR3
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// Demonstrate an error when a local variable is redefined.
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// ERROR3: [[@LINE+1]]:10: error: local variable of this name already exists
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defvar myvar = "another value";
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#endif
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}
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// Instantiate the above multiclass, and expect all the right outputs.
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// CHECK: def aaa_with_global_string {
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// CHECK-NEXT: string s = "foo";
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// CHECK: def aaa_with_local_int {
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// CHECK-NEXT: int i = 101;
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// CHECK-NEXT: string s = "string of 101";
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// CHECK: def bbb_with_global_string {
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// CHECK-NEXT: string s = "foo";
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// CHECK: def bbb_with_local_int {
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// CHECK-NEXT: int i = 102;
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// CHECK-NEXT: string s = "string of 102";
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defm aaa: Test<1>;
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defm bbb: Test<2>;
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// Test that local variables can be defined inside a foreach block, and inside
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// an object body.
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//
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// The scopes nest (you can refer to variables in an outer block from an inner
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// one), and the variables go out of scope again at the end of the block (in
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// particular, you don't get a redefinition error the next time round the
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// loop).
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// CHECK: def nest_f1_s3 {
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// CHECK-NEXT: int member = 113;
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// CHECK-NEXT: }
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// CHECK: def nest_f1_s4 {
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// CHECK-NEXT: int member = 114;
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// CHECK-NEXT: }
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// CHECK: def nest_f2_s3 {
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// CHECK-NEXT: int member = 123;
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// CHECK-NEXT: }
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// CHECK: def nest_f2_s4 {
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// CHECK-NEXT: int member = 124;
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// CHECK-NEXT: }
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foreach first = [ 1, 2 ] in {
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defvar firstStr = "f" # first;
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foreach second = [ 3, 4 ] in {
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defvar secondStr = "s" # second;
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def "nest_" # firstStr # "_" # secondStr {
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defvar defLocalVariable = !add(!mul(first, 10), second);
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int member = !add(100, defLocalVariable);
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}
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}
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}
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defvar firstStr = "now define this at the top level and still expect no error";
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// Test that you can shadow an outer declaration with an inner one. Here, we
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// expect all the shadowOuter records (both above and below the inner foreach)
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// to get the value 1 from the outer definition of shadowedVariable, and the
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// shadowInner ones to get 2 from the inner definition.
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// CHECK: def shadowInner11 {
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// CHECK-NEXT: int var = 2;
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// CHECK: def shadowInner12 {
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// CHECK-NEXT: int var = 2;
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// CHECK: def shadowInner21 {
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// CHECK-NEXT: int var = 2;
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// CHECK: def shadowInner22 {
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// CHECK-NEXT: int var = 2;
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// CHECK: def shadowInnerIf1 {
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// CHECK-NEXT: int var = 3;
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// CHECK: def shadowOuterAbove1 {
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// CHECK-NEXT: int var = 1;
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// CHECK: def shadowOuterAbove2 {
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// CHECK-NEXT: int var = 1;
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// CHECK: def shadowOuterBelowForeach1 {
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// CHECK-NEXT: int var = 1;
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// CHECK: def shadowOuterBelowForeach2 {
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// CHECK-NEXT: int var = 1;
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// CHECK: def shadowOuterBelowIf1 {
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// CHECK-NEXT: int var = 1;
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// CHECK: def shadowOuterBelowIf2 {
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// CHECK-NEXT: int var = 1;
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foreach first = [ 1, 2 ] in {
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defvar shadowedVariable = 1;
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def shadowOuterAbove # first { int var = shadowedVariable; }
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// The foreach statement opens a new scope, in which a new variable of the
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// same name can be defined without clashing with the outer one.
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foreach second = [ 1, 2 ] in {
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defvar shadowedVariable = 2;
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def shadowInner # first # second { int var = shadowedVariable; }
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}
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// Now the outer variable is back in scope.
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def shadowOuterBelowForeach # first { int var = shadowedVariable; }
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// An if statement also opens a new scope.
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if !eq(first, 1) then {
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defvar shadowedVariable = 3;
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def shadowInnerIf # first { int var = shadowedVariable; }
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}
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// Now the outer variable is back in scope again.
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def shadowOuterBelowIf # first { int var = shadowedVariable; }
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}
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// Test that a top-level let statement also makes a variable scope (on the
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// general principle of consistency, because it defines a braced sub-block).
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let someVariable = "some value" in {
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defvar myvar = "override the definition from above and expect no error";
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}
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// CHECK: def topLevelLetTest {
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// CHECK-NEXT: string val = "foo";
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def topLevelLetTest { string val = myvar; }
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