[OptRemarks] Make OptRemarks more generic: rename OptRemarks to Remarks

Getting rid of the name "optimization remarks" for anything that
involves handling remarks on the client side.

It's safer to do this now, before we get stuck with that name in all the
APIs and public interfaces we decide to export to users in the future.

This renames llvm/tools/opt-remarks to llvm/tools/remarks-shlib, and now
generates `libRemarks.dylib` instead of `libOptRemarks.dylib`.

Differential Revision: https://reviews.llvm.org/D58535

llvm-svn: 355439

1 files changed, 202 insertions, 0 deletions

diff --git a/llvm/include/llvm-c/Remarks.h b/llvm/include/llvm-c/Remarks.h
new file mode 100644
index 00000000000..901acac76d9
--- /dev/null
+++ b/llvm/include/llvm-c/Remarks.h
@@ -0,0 +1,202 @@
+/*===-- llvm-c/Remarks.h - Remarks Public C Interface -------------*- C -*-===*\
+|*                                                                            *|
+|* Part of the LLVM Project, under the Apache License v2.0 with LLVM          *|
+|* Exceptions.                                                                *|
+|* See https://llvm.org/LICENSE.txt for license information.                  *|
+|* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception                    *|
+|*                                                                            *|
+|*===----------------------------------------------------------------------===*|
+|*                                                                            *|
+|* This header provides a public interface to a remark diagnostics library.   *|
+|* LLVM provides an implementation of this interface.                         *|
+|*                                                                            *|
+\*===----------------------------------------------------------------------===*/
+
+#ifndef LLVM_C_REMARKS_H
+#define LLVM_C_REMARKS_H
+
+#include "llvm-c/Core.h"
+#include "llvm-c/Types.h"
+#ifdef __cplusplus
+#include <cstddef>
+extern "C" {
+#else
+#include <stddef.h>
+#endif /* !defined(__cplusplus) */
+
+/**
+ * @defgroup LLVMCREMARKS Remarks
+ * @ingroup LLVMC
+ *
+ * @{
+ */
+
+#define REMARKS_API_VERSION 0
+
+/**
+ * String containing a buffer and a length. The buffer is not guaranteed to be
+ * zero-terminated.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+typedef struct {
+  const char *Str;
+  uint32_t Len;
+} LLVMRemarkStringRef;
+
+/**
+ * DebugLoc containing File, Line and Column.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+typedef struct {
+  // File:
+  LLVMRemarkStringRef SourceFile;
+  // Line:
+  uint32_t SourceLineNumber;
+  // Column:
+  uint32_t SourceColumnNumber;
+} LLVMRemarkDebugLoc;
+
+/**
+ * Element of the "Args" list. The key might give more information about what
+ * are the semantics of the value, e.g. "Callee" will tell you that the value
+ * is a symbol that names a function.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+typedef struct {
+  // e.g. "Callee"
+  LLVMRemarkStringRef Key;
+  // e.g. "malloc"
+  LLVMRemarkStringRef Value;
+
+  // "DebugLoc": Optional
+  LLVMRemarkDebugLoc DebugLoc;
+} LLVMRemarkArg;
+
+/**
+ * One remark entry.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+typedef struct {
+  // e.g. !Missed, !Passed
+  LLVMRemarkStringRef RemarkType;
+  // "Pass": Required
+  LLVMRemarkStringRef PassName;
+  // "Name": Required
+  LLVMRemarkStringRef RemarkName;
+  // "Function": Required
+  LLVMRemarkStringRef FunctionName;
+
+  // "DebugLoc": Optional
+  LLVMRemarkDebugLoc DebugLoc;
+  // "Hotness": Optional
+  uint32_t Hotness;
+  // "Args": Optional. It is an array of `num_args` elements.
+  uint32_t NumArgs;
+  LLVMRemarkArg *Args;
+} LLVMRemarkEntry;
+
+typedef struct LLVMRemarkOpaqueParser *LLVMRemarkParserRef;
+
+/**
+ * Creates a remark parser that can be used to read and parse the buffer located
+ * in \p Buf of size \p Size.
+ *
+ * \p Buf cannot be NULL.
+ *
+ * This function should be paired with LLVMRemarkParserDispose() to avoid
+ * leaking resources.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+extern LLVMRemarkParserRef LLVMRemarkParserCreate(const void *Buf,
+                                                  uint64_t Size);
+
+/**
+ * Returns the next remark in the file.
+ *
+ * The value pointed to by the return value is invalidated by the next call to
+ * LLVMRemarkParserGetNext().
+ *
+ * If the parser reaches the end of the buffer, the return value will be NULL.
+ *
+ * In the case of an error, the return value will be NULL, and:
+ *
+ * 1) LLVMRemarkParserHasError() will return `1`.
+ *
+ * 2) LLVMRemarkParserGetErrorMessage() will return a descriptive error
+ *    message.
+ *
+ * An error may occur if:
+ *
+ * 1) An argument is invalid.
+ *
+ * 2) There is a YAML parsing error. This type of error aborts parsing
+ *    immediately and returns `1`. It can occur on malformed YAML.
+ *
+ * 3) Remark parsing error. If this type of error occurs, the parser won't call
+ *    the handler and will continue to the next one. It can occur on malformed
+ *    remarks, like missing or extra fields in the file.
+ *
+ * Here is a quick example of the usage:
+ *
+ * ```
+ * LLVMRemarkParserRef Parser = LLVMRemarkParserCreate(Buf, Size);
+ * LLVMRemarkEntry *Remark = NULL;
+ * while ((Remark == LLVMRemarkParserGetNext(Parser))) {
+ *    // use Remark
+ * }
+ * bool HasError = LLVMRemarkParserHasError(Parser);
+ * LLVMRemarkParserDispose(Parser);
+ * ```
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+extern LLVMRemarkEntry *LLVMRemarkParserGetNext(LLVMRemarkParserRef Parser);
+
+/**
+ * Returns `1` if the parser encountered an error while parsing the buffer.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+extern LLVMBool LLVMRemarkParserHasError(LLVMRemarkParserRef Parser);
+
+/**
+ * Returns a null-terminated string containing an error message.
+ *
+ * In case of no error, the result is `NULL`.
+ *
+ * The memory of the string is bound to the lifetime of \p Parser. If
+ * LLVMRemarkParserDispose() is called, the memory of the string will be
+ * released.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+extern const char *LLVMRemarkParserGetErrorMessage(LLVMRemarkParserRef Parser);
+
+/**
+ * Releases all the resources used by \p Parser.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+extern void LLVMRemarkParserDispose(LLVMRemarkParserRef Parser);
+
+/**
+ * Returns the version of the remarks dylib.
+ *
+ * \since REMARKS_API_VERSION=0
+ */
+extern uint32_t LLVMRemarkVersion(void);
+
+/**
+ * @} // endgoup LLVMCREMARKS
+ */
+
+#ifdef __cplusplus
+}
+#endif /* !defined(__cplusplus) */
+
+#endif /* LLVM_C_REMARKS_H */