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transformer: keep the symbolic expressions inside dump(expr) from being optimised out, even when they could be, when composed of literals known at comptime (#19086)

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Delyan Angelov 2023-08-08 18:25:55 +03:00 committed by GitHub
parent 10df697d32
commit 6813a12339
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4 changed files with 27 additions and 4 deletions
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3
vlib/v/checker/checker.v
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@ -1779,9 +1779,6 @@ fn (mut c Checker) enum_decl(mut node ast.EnumDecl) {
useen << uval
}
}
ast.PrefixExpr {
dump(field.expr)
}
ast.InfixExpr {
// Handle `enum Foo { x = 1 + 2 }`
c.infix_expr(mut field.expr)

7
vlib/v/slow_tests/inout/dump_expressions_with_literals.out Normal file
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@ -0,0 +1,7 @@
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:5] 2 + 2: 4
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:6] 2 * 3 + 50 / 5: 16
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:7] 3.14 + 0.1: 3.24
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:8] 'abc' + 'a': abca
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:9] 'a' + 'b' + 'c': abc
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:10] true || (false && true): true
[vlib/v/slow_tests/inout/dump_expressions_with_literals.vv:11] 2 == 4: false

12
vlib/v/slow_tests/inout/dump_expressions_with_literals.vv Normal file
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@ -0,0 +1,12 @@
// Note: dump expressions should not get optimised out by the transformer stage,
// even though they could normally, when they are composed of literals, i.e.
// the value of the expression is known at compile time.
fn main() {
dump(2 + 2)
dump(2 * 3 + 50 / 5)
dump(3.14 + 0.1)
dump('abc' + 'a')
dump('a' + 'b' + 'c')
dump(true || (false && true))
dump(2 == 4)
}

7
vlib/v/transformer/transformer.v
View File

@ -11,6 +11,7 @@ pub mut:
table &ast.Table = unsafe { nil }
mut:
is_assert bool
inside_dump bool
}
pub fn new_transformer(pref_ &pref.Preferences) &Transformer {
@ -513,6 +514,9 @@ pub fn (mut t Transformer) interface_decl(mut node ast.InterfaceDecl) ast.Stmt {
}
pub fn (mut t Transformer) expr(mut node ast.Expr) ast.Expr {
if t.inside_dump {
return node
}
match mut node {
ast.AnonFn {
node.decl = t.stmt(mut node.decl) as ast.FnDecl
@ -563,7 +567,10 @@ pub fn (mut t Transformer) expr(mut node ast.Expr) ast.Expr {
}
}
ast.DumpExpr {
old_inside_dump := t.inside_dump
t.inside_dump = true
node.expr = t.expr(mut node.expr)
t.inside_dump = old_inside_dump
}
ast.GoExpr {
node.call_expr = t.expr(mut node.call_expr) as ast.CallExpr