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Improve string concatentation & string templates code generation

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Reuse StringBuilder instances for nested subexpressions.
(NB StringBuilder instance for string template with a string
concatenation inside an expression entry, such as `"${"a" + "b"}"`,
will not be reused, although that doesn't seem to be a real-life issue).

 #KT-18558 Fixed Target versions 1.1.4
 #KT-13682 Fixed Target versions 1.1.4

Join adjacent strings literals, escaped strings, and constant values
(in a language version that supports const val inlining).
Use StringBuilder#append(char) for single-character constants
(e.g., " " in "$a $b").

 #KT-17280 Fixed Target versions 1.1.4
 #KT-15235 Fixed Target versions 1.1.4
This commit is contained in:
Dmitry Petrov
2017-06-20 17:08:39 +03:00
parent ae71833a12
commit a84c2a6f31
17 changed files with 313 additions and 56 deletions
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compiler/testData/codegen/bytecodeText/kt5016.kt
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+1 -1
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@@ -6,5 +6,5 @@ class kt5016 {
}
// 0 INVOKEVIRTUAL java/lang/StringBuilder.append \(Ljava/lang/Object;\)Ljava/lang/StringBuilder
// 3 INVOKEVIRTUAL java/lang/StringBuilder.append \(Ljava/lang/String;\)Ljava/lang/StringBuilder
// 2 INVOKEVIRTUAL java/lang/StringBuilder.append \(Ljava/lang/String;\)Ljava/lang/StringBuilder
// 1 INVOKEVIRTUAL java/lang/StringBuilder.toString