DCHECK: Reference condition parameter in release builds
So that caller's won't get warnings about unused variables for variables that are only used in calls to DCHECK, such as int x = ... DCHECK_EQ(x, 17); R=andrew@webrtc.org Previously committed: https://code.google.com/p/webrtc/source/detail?r=7858 and reverted: https://code.google.com/p/webrtc/source/detail?r=7859 Review URL: https://webrtc-codereview.appspot.com/31169004 git-svn-id: http://webrtc.googlecode.com/svn/trunk@7869 4adac7df-926f-26a2-2b94-8c16560cd09d
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@ -71,9 +71,14 @@ namespace rtc {
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#define LAZY_STREAM(stream, condition) \
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!(condition) ? static_cast<void>(0) : rtc::FatalMessageVoidify() & (stream)
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// The actual stream used isn't important.
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#define EAT_STREAM_PARAMETERS \
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true ? static_cast<void>(0) \
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// The actual stream used isn't important. We reference condition in the code
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// but don't evaluate it; this is to avoid "unused variable" warnings (we do so
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// in a particularly convoluted way with an extra ?: because that appears to be
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// the simplest construct that keeps Visual Studio from complaining about
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// condition being unused).
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#define EAT_STREAM_PARAMETERS(condition) \
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(true ? true : !(condition)) \
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? static_cast<void>(0) \
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: rtc::FatalMessageVoidify() & rtc::FatalMessage("", 0).stream()
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// CHECK dies with a fatal error if condition is not true. It is *not*
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@ -159,8 +164,9 @@ DEFINE_CHECK_OP_IMPL(GT, > )
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#define CHECK_GE(val1, val2) CHECK_OP(GE, >=, val1, val2)
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#define CHECK_GT(val1, val2) CHECK_OP(GT, > , val1, val2)
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// The DCHECK macro is equivalent to CHECK except that it only generates code in
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// debug builds.
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// The DCHECK macro is equivalent to CHECK except that it only generates code
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// in debug builds. It does reference the condition parameter in all cases,
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// though, so callers won't risk getting warnings about unused variables.
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#if (!defined(NDEBUG) || defined(DCHECK_ALWAYS_ON))
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#define DCHECK(condition) CHECK(condition)
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#define DCHECK_EQ(v1, v2) CHECK_EQ(v1, v2)
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@ -170,13 +176,13 @@ DEFINE_CHECK_OP_IMPL(GT, > )
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#define DCHECK_GE(v1, v2) CHECK_GE(v1, v2)
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#define DCHECK_GT(v1, v2) CHECK_GT(v1, v2)
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#else
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#define DCHECK(condition) EAT_STREAM_PARAMETERS
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#define DCHECK_EQ(v1, v2) EAT_STREAM_PARAMETERS
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#define DCHECK_NE(v1, v2) EAT_STREAM_PARAMETERS
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#define DCHECK_LE(v1, v2) EAT_STREAM_PARAMETERS
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#define DCHECK_LT(v1, v2) EAT_STREAM_PARAMETERS
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#define DCHECK_GE(v1, v2) EAT_STREAM_PARAMETERS
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#define DCHECK_GT(v1, v2) EAT_STREAM_PARAMETERS
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#define DCHECK(condition) EAT_STREAM_PARAMETERS(condition)
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#define DCHECK_EQ(v1, v2) EAT_STREAM_PARAMETERS((v1) == (v2))
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#define DCHECK_NE(v1, v2) EAT_STREAM_PARAMETERS((v1) != (v2))
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#define DCHECK_LE(v1, v2) EAT_STREAM_PARAMETERS((v1) <= (v2))
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#define DCHECK_LT(v1, v2) EAT_STREAM_PARAMETERS((v1) < (v2))
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#define DCHECK_GE(v1, v2) EAT_STREAM_PARAMETERS((v1) >= (v2))
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#define DCHECK_GT(v1, v2) EAT_STREAM_PARAMETERS((v1) > (v2))
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#endif
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// This is identical to LogMessageVoidify but in name.
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@ -60,7 +60,7 @@ bool AudioEncoderIlbc::EncodeInternal(uint32_t timestamp,
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EncodedInfo* info) {
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const size_t expected_output_len =
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num_10ms_frames_per_packet_ == 2 ? 38 : 50;
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CHECK_GE(max_encoded_bytes, expected_output_len);
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DCHECK_GE(max_encoded_bytes, expected_output_len);
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// Save timestamp if starting a new packet.
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if (num_10ms_frames_buffered_ == 0)
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