dea5a9cc92
In interactive C++ it is convenient to roll back to a previous state of the compiler. For example: clang-repl> int x = 42; clang-repl> %undo clang-repl> float x = 24 // not an error To support this, the patch extends the functionality used to recover from errors and adds functionality to recover the low-level execution infrastructure. The current implementation is based on watermarks. It exploits the fact that at each incremental input the underlying compiler infrastructure is in a valid state. We can only go N incremental inputs back to a previous valid state. We do not need and do not do any further dependency tracking. This patch was co-developed with V. Vassilev, relies on the past work of Purva Chaudhari in clang-repl and is inspired by the past work on the same feature in the Cling interpreter. Co-authored-by: Purva-Chaudhari <purva.chaudhari02@gmail.com> Co-authored-by: Vassil Vassilev <v.g.vassilev@gmail.com> Signed-off-by: Jun Zhang <jun@junz.org>
24 lines
623 B
C++
24 lines
623 B
C++
// RUN: clang-repl "int i = 10;" 'extern "C" int printf(const char*,...);' \
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// RUN: 'auto r1 = printf("i = %d\n", i);' | FileCheck --check-prefix=CHECK-DRIVER %s
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// REQUIRES: host-supports-jit
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// UNSUPPORTED: system-aix
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// CHECK-DRIVER: i = 10
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// RUN: cat %s | clang-repl | FileCheck %s
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extern "C" int printf(const char *, ...);
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int x1 = 0;
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int x2 = 42;
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%undo
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int x2 = 24;
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auto r1 = printf("x1 = %d\n", x1);
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// CHECK: x1 = 0
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auto r2 = printf("x2 = %d\n", x2);
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// CHECK-NEXT: x2 = 24
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int foo() { return 1; }
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%undo
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int foo() { return 2; }
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auto r3 = printf("foo() = %d\n", foo());
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// CHECK-NEXT: foo() = 2
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%quit
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